JP6264611B2 - Vibration type actuator, its control device, electric device equipped with vibration type actuator, and program for vibration type actuator - Google Patents

Description

  The present invention relates to a vibration type actuator, a control device therefor, an electric device including the vibration type actuator, and a program for the vibration type actuator.

  A clipper or a shaver is known as an example of an electric device using a vibration type actuator as a drive source. The vibration type actuator includes, for example, an output block and an even block that are a pair of magnetic blocks arranged so as to be able to reciprocate relatively and linearly, and a spring that supports the output block so as to be able to reciprocate linearly. . A clipper or a shaver movable blade is attached to the output block. According to one example, the output block includes a permanent magnet and the even block includes an electromagnet.

  The vibration type actuator further includes a control device that feedback-controls the displacement of the output block, which is an example of the controlled variable, a drive circuit that supplies current to the electromagnet, and a sensor that outputs a measurement signal that changes according to the displacement of the output block. Prepare.

  The control device calculates a measured value related to the displacement of the output block based on the sensor measurement signal, and adjusts the amount of current supplied from the drive circuit to the electromagnet based on the deviation between the measured value and the target value of the controlled variable Execute feedback control.

  In this feedback control, based on a first deviation that is a deviation between a measured value and a target value when the output block moves in the first movement direction that is one of the reciprocating movement directions, the output block performs the first movement. A current supply time is set, which is a time during which current is supplied to the electromagnet when moving in the direction. Then, a control signal is output from the control device to the drive circuit so that current is supplied from the drive circuit to the electromagnet according to the set current supply time.

  When the drive circuit supplies current to the electromagnet based on the control signal, the output block moves linearly with respect to the even block due to the relationship between the magnetic field formed by the electromagnet and the magnetic field formed by the output block. When the output block moves in the second movement direction which is the other of the reciprocating movement directions, the current supply time is set based on the second deviation which is the deviation between the measured value and the target value at that time. Current is supplied from the drive circuit to the electromagnet according to the current supply time.

  According to the clipper or shaver, the output block reciprocates linearly with respect to the even block, so that the movable blade linearly reciprocates with respect to the fixed blade, and the hair is cut by the movable blade and the fixed blade. The Patent Document 1 discloses an example of such a vibration type actuator.

JP-A-8-331826

  According to the conventional vibration type actuator, the displacement of the output block is controlled by feedback control as described above. However, when the load acting on the movable blade increases, the deviation between the displacement and the target value when the output block moves in one of the first movement direction and the second movement direction increases rapidly, and the deviation is It may take a relatively long time to converge to zero. In this case, the hair clipper or shaver's ability to cut hair may be reduced.

  When the inventor of the present application examined the reason why the deviation increases as described above, the following matters were confirmed. For example, when the vibration actuator starts to be driven in a state where a certain load is applied to the output block, the first deviation and the second deviation converge to 0 after a predetermined time has elapsed. At that time, for example, the operation amount corresponding to the first movement direction may have a sufficiently small value with respect to the operation amount corresponding to the second movement direction.

  From this state, when the load acting on the output block increases from the constant load, the first deviation increases rapidly due to the small amount of operation corresponding to the first movement direction. Thereafter, the current supply time is adjusted so that the first deviation converges to 0 by feedback control, but the first deviation that occurs when the load increases is large, so the first deviation converges to 0. Takes a relatively long time.

  Here, the problem is examined by using a clipper or a shaver as an example, but it is considered that the same problem as described above exists also in other electric devices including a vibration type actuator.

  An object of the present invention is to provide a vibration type actuator in which a deviation between a control amount and a target value is unlikely to increase even when a load acting on an output block increases, a control device thereof, an electric device, and a program for the vibration type actuator. That is.

  A control device for a vibration type actuator according to an embodiment of the present invention is capable of reciprocating with an output block and an even block that are a pair of magnetic blocks that reciprocate relatively in a first motion direction and a second motion direction. A spring for supporting the output block; and an electromagnet attached to at least one of the pair of magnetic blocks. The control device is supplied to the electromagnet so that a vibration system including the output block and the spring vibrates. The amount of current supplied to the electromagnet, which is the manipulated variable, based on the deviation between the measured value related to the displacement, speed, or acceleration of the output block, which is the controlled variable, and the target value of the controlled variable A feedback control to adjust the measured value when the output block moves in the first movement direction, and The operation amount corresponding to the first movement direction and the operation corresponding to the second movement direction using a small value among the measured values when the output block moves in the second movement direction. Adjust the amount.

  According to one form of the vibration type actuator, its control device, the electric device equipped with the vibration type actuator, and the program of the vibration type actuator, even if the load acting on the output block increases, the deviation between the control amount and the target value is It becomes difficult to increase.

FIG. 3 is a schematic diagram of a clipper according to Embodiment 1. FIG. 3 is a schematic diagram of the vibration type actuator according to the first embodiment. FIG. 3 is a control block diagram of the vibration type actuator according to the first embodiment. 3 is a flowchart regarding feedback control according to the first embodiment. 6 is a timing chart at the start of control related to Embodiment 1 or conventional feedback control. The timing chart at the time of deviation convergence regarding the conventional feedback control. 4 is a timing chart at the time of deviation convergence regarding feedback control according to the first embodiment. 10 is a flowchart regarding feedback control according to the second embodiment.

(An example of a configuration that a vibration actuator control device can take)
[1] A vibration type actuator according to an aspect of the present invention is a control device for a vibration type actuator, wherein the vibration type actuator reciprocates relatively in a first movement direction and a second movement direction. An output block and a pair block that are magnetic blocks; a spring that supports the output block so as to be capable of reciprocating; and an electromagnet attached to at least one of the pair of magnetic blocks. The current supplied to the electromagnet is controlled so that the vibration system including the spring vibrates, and the deviation between the measured value relating to the displacement, speed, or acceleration of the output block, which is a controlled variable, and the target value of the controlled variable. Feedback control for adjusting the amount of current supplied to the electromagnet, which is an operation amount, is performed based on Using the smaller value of the measured value when the block moves in the first movement direction and the measured value when the output block moves in the second movement direction, the output block The operation amount when moving in the first movement direction and the second movement direction is adjusted.

  According to the control device for the vibration type actuator, since the small value is used for adjusting the operation amount corresponding to each motion direction, the operation amount corresponding to the first motion direction and the operation corresponding to the second motion direction. It is difficult to form a situation where one of the quantities is set to a smaller value than the other. For this reason, there is a low possibility that one of the driving force corresponding to the first movement direction and the driving force corresponding to the second movement direction is set to a value smaller than the preferable driving force due to the influence of spring tolerance and the like. Become. For this reason, even if the load acting on the output block increases, the deviation between the control amount and the target value is unlikely to increase.

  [2] According to an embodiment subordinate to the control device for the vibration type actuator, the control device for the vibration type actuator is configured such that the vibration type actuator is relatively in the first movement direction and the second movement direction. The control device comprises an output block and a pair block that are a pair of magnetic blocks that reciprocate, a spring that supports the output block so as to be able to reciprocate, and an electromagnet attached to at least one of the pair of magnetic blocks. The current supplied to the electromagnet is controlled so that the vibration system including the output block and the spring vibrates, and the measured value related to the displacement, speed, or acceleration of the output block, which is a controlled variable, and the controlled variable are controlled. Feedback control for adjusting the amount of current supplied to the electromagnet, which is the operation amount, based on the deviation from the target value A deviation between the measured value and the target value when the output block moves in the first movement direction, and the measured value when the output block moves in the second movement direction. When one of the deviations from the target value is a positive deviation and the other is a negative deviation, the manipulated variable and the second movement corresponding to the first movement direction are used by using the negative deviation. The operation amount corresponding to the direction is adjusted.

  According to the control device for the vibration type actuator, since the negative deviation is used for adjusting the operation amount corresponding to each movement direction, it corresponds to the operation amount corresponding to the first movement direction and the second movement direction. It is difficult to form a situation where one of the manipulated variables is set to a smaller value than the other. For this reason, as with the vibration type actuator [1], even if the load acting on the output block increases, the deviation between the control amount and the target value is unlikely to increase.

  [3] According to an embodiment subordinate to the control device for the vibration type actuator, the control device supplies current to the electromagnet when the output block moves in the first movement direction or the second movement direction. The operation amount is adjusted by adjusting a current supply time which is a time during which the current is supplied.

  [4] According to one aspect dependent on the control device for the vibration type actuator, the vibration type actuator further includes a drive circuit for supplying a current to the electromagnet, and the control device is configured to output the current based on the deviation. A supply time is adjusted, and the drive circuit is controlled so that a current is supplied from the drive circuit to the electromagnet according to the current supply time.

  [5] According to an embodiment dependent on the control device for the vibration type actuator, the vibration type actuator detects at least one of displacement, speed, and acceleration of the output block, and changes according to the result. And a sensor that outputs a measurement signal to be output, wherein the control device is configured such that the output block is based on the measurement signal detected when the output block moves in the first movement direction. Calculating a first measurement value that is the measurement value when moving in a direction, and based on the measurement signal detected when the output block moves in the second movement direction, the output block A first measurement value that is the measurement value when moving in the second movement direction is calculated.

[6] According to one mode dependent on the control device of the vibration type actuator, the measurement value used for adjusting the operation amount or the negative deviation is determined every predetermined period.
[7] According to one mode dependent on the control device for the vibration type actuator, the predetermined cycle is a cycle in which the movement direction of the output block is switched.

[8] One mode of the vibration type actuator includes a control device for the vibration type actuator.
[9] One embodiment of the present electric device includes the vibration type actuator.

  [10] One form of the program of the vibration type actuator is a program for controlling the vibration type actuator, and the vibration type actuator reciprocates relatively in the first movement direction and the second movement direction. An output block and an even block, which are magnetic blocks, a spring which supports the output block so as to be able to reciprocate, an electromagnet attached to at least one of the pair of magnetic blocks, and a vibration system including the output block and the spring The amount of operation is controlled based on the deviation between the measured value related to the displacement, speed, or acceleration of the output block, which is a controlled variable, and the target value of the controlled variable. And a control device that performs feedback control for adjusting the amount of current supplied to the electromagnet. The program causes the controller to calculate a first measurement value that is the measurement value when the output block moves in the first movement direction, and the output block moves to the second movement direction. A step of causing the control device to calculate a second measurement value, which is the measurement value when moving in the first movement, and the operation amount when the output block moves in the first movement direction as the first measurement value. And the step of causing the control device to adjust based on a small value of the second measured value, and the operation amount when the output block moves in the second movement direction based on the small value. Adjusting the control device.

  According to the program of the vibration type actuator, since the small value is used for adjusting the operation amount corresponding to each movement direction, the operation amount corresponding to the first movement direction and the operation amount corresponding to the second movement direction. It is difficult to form a situation where one of the two is set to a smaller value than the other. For this reason, similarly to the control device for the vibration type actuator of [1], even if the load acting on the output block increases, the deviation between the control amount and the target value is unlikely to increase.

  [11] One form of the program of the vibration actuator is a program for controlling the vibration actuator, and the vibration actuator reciprocates relatively in the first movement direction and the second movement direction. An output block and an even block, which are magnetic blocks, a spring which supports the output block so as to be able to reciprocate, an electromagnet attached to at least one of the pair of magnetic blocks, and a vibration system including the output block and the spring The amount of operation is controlled based on the deviation between the measured value related to the displacement, speed, or acceleration of the output block, which is a controlled variable, and the target value of the controlled variable. And a control device that performs feedback control for adjusting the amount of current supplied to the electromagnet. The program causes the controller to calculate a first deviation which is a deviation between the measured value and the target value when the output block moves in the first movement direction; and Causing the control device to calculate a second deviation which is a deviation between the measured value and the target value when moving in the second movement direction, and one of the first deviation and the second deviation When the output block moves in the first motion direction when the output block is a positive deviation and the other is a negative deviation, the control device adjusts the operation amount based on the negative deviation; And causing the control device to adjust the operation amount when the output block moves in the second movement direction based on the negative deviation.

  According to the program of the present vibration type actuator, the negative deviation is used for adjusting the operation amount corresponding to each motion direction, and therefore the operation amount corresponding to the first motion direction and the operation corresponding to the second motion direction. It is difficult to form a situation where one of the quantities is set to a smaller value than the other. For this reason, similarly to the control device for the vibration type actuator of [1], even if the load acting on the output block increases, the deviation between the control amount and the target value is unlikely to increase.

(Embodiment 1)
FIG. 1 shows a clipper 100 which is an electric device equipped with a vibration type actuator 10 as a drive source. The clipper 100 includes a body 110 for a user to hold, a head unit 120 for cutting hair, and a vibration type actuator 10 that drives the head unit 120. The clipper 100 further includes a power source 130 that supplies power to the vibration type actuator 10 and a constant voltage source 140 that supplies a constant voltage to the vibration type actuator 10 based on the power of the power source 130.

  The body 110 incorporates various components constituting the clipper 100 including the vibration type actuator 10. The body 110 and the head unit 120 include a mounting structure that allows the user to arbitrarily select whether to attach the head unit 120 to the body 110 and to remove the head unit 120 from the body 110.

  The head unit 120 includes a fixed blade 121 and a movable blade 122 that are a pair of blades that linearly and relatively reciprocate, and a connecting portion 123 to which the output shaft 33 of the vibration type actuator 10 is connected.

  The vibration-type actuator 10 includes a frame 20 that forms a skeleton thereof, an output block 30 and a pair block 40 that are a pair of linear and relatively reciprocating magnetic blocks, and an output shaft 33 that is coupled to the output block 30. Prepare. The vibration type actuator 10 further includes a drive circuit 70 that supplies electric power to the even block 40 and a control device 60 that controls a current supplied from the drive circuit 70 to the even block 40.

  The frame 20 is fixed to the head unit 120. The output block 30 reciprocates in the first movement direction and the second movement direction with respect to the pair block 40 by supplying a current to the pair block 40. The control device 60 is electrically connected to the constant voltage source 140 and is driven based on a constant voltage supplied from the constant voltage source 140. The drive circuit 70 is electrically connected to the power source 130 and is driven based on the power supplied from the power source 130.

  By attaching the head unit 120 to the body 110, the connecting portion 123 and the output shaft 33 are connected to each other, and the output shaft 33 and the connecting portion 123 can transmit the reciprocating motion of the output block 30 to the movable blade 122. Therefore, when the output block 30 reciprocates while the head unit 120 is attached to the body 110, the movable blade 122 reciprocates linearly with respect to the fixed blade 121 in synchronization with the reciprocating motion of the output block 30. To do.

With reference to FIG. 2, the structure of the vibration type actuator 10 is demonstrated.
In addition to the frame 20 and the like, the vibration actuator 10 includes a pair of springs 50 that apply reaction forces acting in opposite directions to the output block 30, and displacement of the output block 30 that is an example of motion information of the output block 30. It further includes a sensor 80 for detecting. The output block 30 and the even block 40 are opposed to each other with a gap extending in the reciprocating direction. The output block 30 and the pair of springs 50 constitute a vibration system.

  The even number block 40 is fixed to the frame 20. An electromagnet 41 is fixed to the kinematic block 40. The electromagnet 41 includes, for example, a core 42 formed by sintering, a core 42 on which electromagnetic steel plates are stacked, and a coil 43 wound around the core 42. The coil 43 is electrically connected to the drive circuit 70.

  The output block 30 is supported by a pair of springs 50 so as to reciprocate with respect to the head unit 120. A drive magnet 31 that is a permanent magnet for driving the output block 30 and a detection magnet 32 for causing the sensor 80 to detect the displacement of the output block 30 are attached to the output block 30.

  The drive magnet 31 has a pair of magnetic poles arranged in the reciprocating direction of the output block 30. According to the vibration type actuator 10, the positions of the output block 30 and the even block 40 are set so that the magnetic fields formed by the drive magnet 31 and the electromagnet 41 influence each other.

  The detection magnet 32 has a pair of magnetic poles arranged in the reciprocating direction of the output block 30. According to the vibration type actuator 10, the position of the sensor 80 with respect to the output block 30 is set so that the magnetic field formed by the detection magnet 32 affects the sensor 80.

  The first spring 50, which is one of the springs 50, is disposed between the output block 30 and the frame 20 so that the amount of compression increases when the output block 30 moves in the first movement direction. And fixed to each of the frames 20. The second spring 50, which is the other spring 50, is disposed between the output block 30 and the frame 20 so that the amount of compression increases when the output block 30 moves in the second movement direction. And fixed to each of the frames 20. The first spring 50 and the second spring 50 are set to the same specifications. However, the actual characteristics of the springs 50 may differ from each other due to manufacturing tolerances of the springs 50.

  When no load is applied to the output shaft 33 and no electric current is supplied to the electromagnet 41, the reaction force of the first spring 50 and the reaction force of the second spring 50 are balanced, so that the even block The relative position which is the position of the output block 30 with respect to 40 takes the neutral position. As the output block 30 moves from the neutral position in the first movement direction, the displacement of the output block 30 in the first movement direction changes. On the other hand, when the output block 30 moves from the neutral position in the second movement direction, the displacement of the output block 30 in the second movement direction changes.

  The control device 60 is supplied from the drive circuit 70 to the electromagnet 41 so that the vibration system including the output block 30 and the pair of springs 50 vibrates at the natural frequency by controlling the drive circuit 70 based on, for example, PWM control. Adjust the current frequency. The control device 60 further performs feedback control of the control amount of the output block 30 that is the control target. An example of feedback control executed by the control device 60 is PID control. In this feedback control, the amount of current supplied from the drive circuit 70, which is an operation amount, to the electromagnet 41 is adjusted so that the displacement of the output block 30, which is an example of the control amount, converges to a target value. The storage unit included in the control device 60 stores a program describing feedback control and various setting values used for feedback control and the like.

  The drive circuit 70 includes, for example, a single-phase full bridge type inverter. This inverter includes two arms connected in parallel. Each arm includes two MOSFETs (metal-oxide-semiconductor field-effect transistors) connected in series. Each MOSFET is turned on or off in accordance with a control signal SD input from the control device 60, whereby an alternating current is supplied from the drive circuit 70 to the electromagnet 41.

  An example of the sensor 80 is a coil. The sensor 80 is fixed to the frame 20 and is electrically connected to the control device 60. As the output block 30 moves relative to the even block 40, the detection magnet 32 attached to the output block 30 also moves. For this reason, an induced current flows through the sensor 80 due to the influence of the magnetic field formed by the detection magnet 32. The sensor 80 inputs the voltage of the induced current that is the measurement signal SX related to the displacement of the output block 30 to the control device 60.

The feedback control of the control device 60 will be described with reference to FIG.
The control device 60 executes a program stored in advance to construct a detection unit 61, a comparison unit 62, and an adjustment unit 63, which are functional blocks related to feedback control, and the displacement of the output block 30 is determined by these functional blocks. Control.

  Based on the measurement signal SX output from the sensor 80, the detection unit 61 calculates measurement values related to the displacement, velocity, acceleration, and movement direction of the output block 30 that are movement information of the output block 30. According to the vibration type actuator 10, the voltage of the induced current flowing through the sensor 80 changes according to the movement of the output block 30. For this reason, the detection part 61 can calculate the various measured values regarding the exercise information of the output block 30 based on the measurement signal SX.

  The displacement measurement value XA, which is the displacement measurement value calculated by the detection unit 61, the speed measurement value XB, which is the velocity measurement value, the acceleration measurement value XC, which is the acceleration measurement value, and the exercise, which is the measurement value in the movement direction The direction measurement value XD is input to the comparison unit 62.

  The detection unit 61 detects the timing at which the displacement of the output block 30 reaches the maximum displacement in the first movement direction based on the measurement signal SX, and at this time, the first displacement measurement value XA1 that is the displacement measurement value XA is detected. calculate. The detection unit 61 detects the timing when the displacement of the output block 30 reaches the maximum displacement in the second movement direction based on the measurement signal SX, and the second displacement measurement value XA2 that is the displacement measurement value XA at that time. Is calculated.

  The comparison unit 62 receives the same target value XT when the output block 30 moves in the first movement direction and when the output block 30 moves in the second movement direction. Note that the storage unit included in the control device 60 stores the target value TX input to the comparison unit 62 in advance. This target value TX is an example of a set value stored in advance in the storage unit.

  Each time the movement direction of the output block 30 is switched, the comparison unit 62 compares the first displacement measurement value XA1 calculated last and the second displacement measurement value XA2, and adjusts the smaller value of the first displacement measurement value XA1. Is set to the displacement measurement value XAX for adjustment used in the above. When the output block 30 moves in the first movement direction, the comparison unit 62 calculates a deviation ΔX between the adjustment displacement measurement value XAX and the target value XT. Further, when the output block 30 moves in the second movement direction, the comparison unit 62 similarly calculates a deviation ΔX between the displacement measurement value XAX for adjustment and the target value XT.

  In this way, when the output block 30 moves in the first movement direction and when the output block 30 moves in the second movement direction, based on the same displacement measurement value XAX for adjustment and the target value TX. Deviation ΔX is calculated. For this reason, the deviation ΔX in the first movement direction and the deviation ΔX in the second movement direction have the same value.

  The adjustment unit 63 adjusts the amount of current supplied to the electromagnet 41 by adjusting the current supply time, which is the time during which current is supplied from the drive circuit 70 to the electromagnet 41 so that the deviation ΔX converges to zero. . Further, the adjusting unit 63 sets the current supply time based on the deviation ΔX, and sets the direction of the current flowing through the electromagnet 41 based on the movement direction measurement value XD. The adjustment unit 63 further sets the timing at which the drive circuit 70 starts to output current based on the speed measurement value XB or the acceleration measurement value XC. The adjustment unit 63 generates a control signal SD for causing the drive circuit 70 to output a current in accordance with these pieces of information, and outputs the generated control signal SD to the drive circuit 70.

  The current supply time is the current from the drive circuit 70 to the electromagnet 41 when the output block 30 moves in the first movement direction during one cycle of the reciprocating movement or when the output block 30 moves in the second movement direction. Is the time to be supplied.

  The drive circuit 70 is driven based on the control signal SD input from the adjustment unit 63 and supplies current to the electromagnet 41. For this reason, the electromagnet 41 forms a magnetic field by the current supplied from the drive circuit 70. At this time, depending on the relationship between the magnetic field formed by the electromagnet 41 and the magnetic field formed by the driving magnet 31, a driving force that moves the output block 30 in the first movement direction or the second movement direction is applied to the output block 30. Works.

  When the output block 30 moves in the first movement direction, the control device 60 flows to the electromagnet 41 so that a first driving force that is a driving force acting in the first movement direction acts on the output block 30. Sets the current direction. In addition, when the output block 30 moves in the second movement direction, the control device 60 applies a force to the electromagnet 41 so that a second driving force that is a driving force acting in the second movement direction acts on the output block 30. Sets the direction of the flowing current.

A flowchart of feedback control will be described with reference to FIG. The control device 60 repeatedly executes the processing shown in the flowchart every predetermined control cycle.
In step S11, the comparison unit 62 operates. The comparison unit 62 reads the first displacement measurement value XA1 and the second displacement measurement value XA2 calculated last from the storage unit.

  In step S12, the comparison unit 62 operates. The comparison unit 62 determines a small value of the first displacement measurement value XA1 and the second displacement measurement value XA2, and sets the determined small value as the adjustment displacement measurement value XAX. When the first displacement measurement value XA1 is smaller than the second displacement measurement value XA2, the first displacement measurement value XA1 is moved in the first motion direction until the adjustment displacement measurement value XAX is updated next time. It is used to adjust the corresponding current supply time and the current supply time corresponding to the second movement direction. On the other hand, when the second displacement measurement value XA2 is smaller than the first displacement measurement value XA1, the second displacement measurement value XA2 is the first motion until the adjustment displacement measurement value XAX is updated next time. It is used to adjust the current supply time corresponding to the direction and the current supply time corresponding to the second movement direction.

  In step S13, the adjusting unit 63 operates. When the output block 30 moves in the first movement direction or the second movement direction, the adjustment unit 63 calculates a deviation ΔX between the displacement measurement value XAX for adjustment set in step S12 and the target value XT, The current supply time is set based on this deviation ΔX.

  In step S14, the adjusting unit 63 operates. The adjustment unit 63 generates the control signal SD based on the current supply time set in step S13 and the movement direction measurement value XD calculated by the detection unit 61, and outputs the generated control signal SD to the drive circuit 70. .

  In step S15, the detection unit 61 operates. When the output block 30 is moving in the first movement direction, the detection unit 61 calculates the first displacement measurement value XA1 and the like based on the measurement signal SX, and stores each calculated measurement value in the storage unit. . Further, when the output block 30 is moving in the second movement direction, the detection unit 61 calculates the second displacement measurement value XA2 and the like based on the measurement signal SX and stores each calculated measurement value in the storage unit. To do.

The feedback control of the comparative example will be described with reference to FIGS.
Here, the vibration type actuator of Patent Document 1 is taken up as an example of the vibration type actuator of the comparative example. When this vibration actuator is driven under the following first to third initial conditions, feedback control is executed as follows. The first initial condition is that the spring constant of the first spring is smaller than the spring constant in the designed spring specifications. The second initial condition is that the spring constant of the second spring is greater than the spring constant in the designed spring specifications. The third initial condition is that a certain load is applied to the output block.

  The control device moves the output block in the second movement direction immediately after starting the feedback control, for example, by controlling the drive circuit. At this time, the control device outputs a control signal to the drive circuit so that the output of the current from the drive circuit is started at a predetermined timing and the output of the current is continued according to the initial value of the current supply time.

  The drive circuit outputs a current based on this control signal, whereby the output block moves in the second movement direction, and the displacement of the output block approaches the target value. According to the vibration type actuator of the comparative example, since the spring constant of the first spring is small, even when current is supplied to the electromagnet according to the initial value of the current supply time, the maximum displacement of the output block in the second movement direction Does not reach the target value.

  At time t51, which is one time thereafter, the control device detects that the displacement of the output block has reached the maximum displacement in the second movement direction based on the sensor measurement signal, and the second displacement measurement value and A second deviation which is a deviation from the target value is calculated. Next, the control device outputs a control signal to the drive circuit so that output of current from the drive circuit is started at a predetermined timing and current output is continued according to the initial value of the current supply time. This control signal also includes information for flowing a current in a direction opposite to that initially supplied to the electromagnet.

  At time t52, which is one time thereafter, the drive circuit starts to supply current to the electromagnet. For this reason, the first driving force acts on the output block. The drive circuit supplies current to the electromagnet from time t52 until time t53 when the current supply time elapses. At time t <b> 53, the drive circuit stops supplying current, so that the first driving force that has been applied to the output block until then stops operating.

  According to this vibration type actuator, since the spring constant of the second spring is large, the current is supplied to the electromagnet according to the initial value of the current supply time, whereby the maximum displacement of the output block in the first movement direction is reduced. The target value is exceeded.

  At time t54, which is one time thereafter, the control device detects that the displacement of the output block has reached the maximum displacement in the first movement direction based on the measurement signal of the sensor, and the first displacement measurement value and A first deviation which is a deviation from the target value is calculated. Next, the control device sets a new current supply time based on the previously calculated second deviation, starts output of current from the drive circuit at a predetermined timing, and according to the set current supply time A control signal is output to the drive circuit so that the current output is continued. This control signal also includes information for causing a current to flow in the direction opposite to the current supplied to the electromagnet during the period from time t52 to t53.

  At time t55, which is one time thereafter, the drive circuit starts to supply current to the electromagnet. For this reason, the second driving force acts on the output block. The drive circuit supplies current to the electromagnet from time t55 to time t56 when the current supply time elapses. At time t56, the drive circuit stops supplying current, so that the second driving force that has been applied to the output block until then stops operating.

  At time t57, which is one time thereafter, the control device again detects that the displacement of the output block has reached the maximum displacement in the second movement direction, based on the sensor measurement signal.

  Then, every time the displacement of the output block reaches the maximum displacement in the first movement direction or the second movement direction after time 57, the control device performs the first deviation or the same in the same way as the period from time t54 to t57. The current supply time is set based on the second deviation. For this reason, by continuing the feedback control in a state where a certain load is applied to the output block, the current supply time corresponding to the first movement direction is gradually shortened, and the current supply corresponding to the second movement direction is performed. Time is gradually extended.

FIG. 6 shows a state in which the first deviation and the second deviation have converged to 0, respectively, by continuing the feedback control after time t57.
At time t61, which is one time after time t57, the control device detects that the displacement of the output block has reached the maximum displacement in the second movement direction based on the measurement signal of the sensor, and determines the second deviation. calculate. The second deviation calculated at this time is substantially zero.

  Next, the control device starts a current output from the drive circuit at a predetermined timing, and controls the drive circuit so that the current output is continued according to the current supply time set at that time. Is output. The current supply time at this time is sufficiently shorter than the initial value of the current supply time and the current supply time corresponding to the second movement direction. According to an example, the current supply time may take a lower limit value of the current supply time in the feedback control.

  The drive circuit supplies current to the electromagnet during a period from time t62 to time t63, which is one time thereafter. At this time, since the amount of current supplied to the electromagnet is small because the set current supply time is short, the first driving force acting on the output block is smaller than that immediately after the feedback control is started, for example. .

  At time t64, which is one time thereafter, the control device detects that the displacement of the output block has reached the maximum displacement in the first movement direction based on the sensor measurement signal, and calculates the first deviation. . The first deviation calculated at this time is substantially zero.

  Next, the control device starts a current output from the drive circuit at a predetermined timing, and controls the drive circuit so that the current output is continued according to the current supply time set at that time. Is output. The current supply time at this time is sufficiently longer than the initial value of the current supply time and the current supply time corresponding to the first movement direction. According to an example, the current supply time may take an upper limit value of the current supply time in the feedback control.

  The drive circuit supplies current to the electromagnet in a period from time t65 to time t66, which is one time thereafter. At this time, since the amount of current supplied to the electromagnet is large due to the set current supply time being long, the second driving force acting on the output block is larger than, for example, immediately after the feedback control is started. .

  As described above, in the state where each deviation has converged to 0, when the load acting on the output block increases when the output block moves in the first movement direction, the first driving force is small. The maximum displacement in the first movement direction decreases rapidly. For this reason, the first deviation, which is the deviation between the first measured displacement value and the target value in the first movement direction, rapidly increases.

  Thereafter, the current supply time is adjusted so that the first deviation converges to 0 by feedback control, but the first deviation that occurs when the load increases is large, so the first deviation converges to 0. Takes a relatively long time. For this reason, there exists a possibility that the state in which the capability regarding the cutting | disconnection of the hair in a clipper fell may continue comparatively long. In addition, although the case where each deviation converged to 0 is taken as an example here, even before each deviation converges to 0, one of the first driving force and the second driving force is set to the other. A similar situation can occur when the load on the output block increases when it is decreasing.

The feedback control of the control device 60 will be described with reference to FIGS.
When the vibration type actuator 10 is driven under the same initial conditions as the three initial conditions given to the vibration type actuator of the comparative example, feedback control is executed as follows.

  Immediately after starting the feedback control, the control device 60 controls the drive circuit 70 to move the output block 30 in the second movement direction, for example. At this time, the control device 60 starts the output of the current from the drive circuit 70 at a predetermined timing, and the control signal SD to the drive circuit 70 so that the output of the current is continued according to the initial value of the current supply time. Is output.

  When the drive circuit 70 outputs a current based on the control signal SD, the output block 30 moves in the second movement direction, and the displacement of the output block 30 approaches the target value XT. According to the vibration type actuator 10, since the spring constant of the first spring 50 is small, even if a current is supplied to the electromagnet 41 according to the initial value of the current supply time, the maximum of the output block 30 in the second movement direction. The displacement does not reach the target value XT.

  At time t51 that is one time thereafter, the control device 60 detects that the displacement of the output block 30 has reached the maximum displacement in the second movement direction based on the measurement signal SX of the sensor 80. Next, the control device 60 determines a smaller value between the second measured displacement value XA2 calculated at time t51 and the initial value of the first measured displacement value XA1, and uses the determined smaller value as a displacement for adjustment. Set to measured value XAX. Here, since the initial value of the first displacement measurement value XA1 has 0, the second displacement measurement value XA2 is set as the adjustment displacement measurement value XAX.

  Next, the control device 60 starts the output of the current from the drive circuit 70 at a predetermined timing, and the control signal SD to the drive circuit 70 so that the output of the current is continued according to the initial value of the current supply time. Is output. The control signal SD also includes information for causing a current to flow in a direction opposite to the current first supplied to the electromagnet 41.

  The drive circuit 70 starts to supply current to the electromagnet 41 at time t52, which is one time thereafter. For this reason, the first driving force acts on the output block 30. The drive circuit 70 supplies current to the electromagnet 41 from time t52 until time t53 when the current supply time elapses. At time t <b> 53, the drive circuit 70 stops supplying current, so that the first driving force that has been applied to the output block 30 until then is no longer applied.

  According to the vibration type actuator 10, since the spring constant of the second spring 50 is large, the current is supplied to the electromagnet 41 according to the initial value of the current supply time, whereby the output block 30 in the first movement direction is The maximum displacement exceeds the target value XT.

  At time t54, which is one time thereafter, the control device 60 detects that the displacement of the output block 30 has reached the maximum displacement in the first movement direction based on the measurement signal SX of the sensor 80.

  Next, the control device 60 determines a small value between the first displacement measurement value XA1 calculated at time t54 and the second displacement measurement value XA2 calculated at time t51, and uses the determined small value for adjustment. Set to the measured displacement value XAX. According to the illustrated example, since the second displacement measurement value XA2 is smaller than the first displacement measurement value XA1, the second displacement measurement value XA2 is continuously set to the adjustment displacement measurement value XAX.

  Next, the controller 60 calculates a deviation ΔX between the displacement measurement value XAX for adjustment and the target value XT, and sets a current supply time based on the deviation ΔX. Next, the control device 60 sends a control signal SD to the drive circuit 70 so that output of current from the drive circuit 70 is started at a predetermined timing and output of current is continued according to the set current supply time. Output. The control signal SD also includes information for causing a current to flow in a direction opposite to the current supplied to the electromagnet 41 during the period from time t52 to t53.

  The drive circuit 70 starts to supply current to the electromagnet 41 at time t55, which is one time thereafter. For this reason, the second driving force acts on the output block 30. The drive circuit 70 supplies current to the electromagnet from time t55 to time t56 when the current supply time elapses. At time t56, the driving circuit 70 stops supplying current, so that the second driving force that has been applied to the output block 30 until then stops operating.

  At time t57, which is one time thereafter, the control device 60 detects again that the displacement of the output block 30 has reached the maximum displacement in the second movement direction based on the measurement signal SX of the sensor 80. Next, the control device 60 determines a small value between the second displacement measurement value XA2 calculated at time t57 and the first displacement measurement value XA1 calculated at time t54, and uses the determined small value for adjustment. Set to the measured displacement value XAX. According to the illustrated example, since the second displacement measurement value XA2 is smaller than the first displacement measurement value XA1, the second displacement measurement value XA2 is continuously set to the adjustment displacement measurement value XAX.

  Next, the controller 60 calculates a deviation ΔX between the displacement measurement value XAX for adjustment and the target value XT, and sets a current supply time based on the deviation ΔX. Next, the control device 60 sends a control signal SD to the drive circuit 70 so that output of current from the drive circuit 70 is started at a predetermined timing and output of current is continued according to the set current supply time. Output.

  Then, every time the displacement of the output block 30 reaches the maximum displacement in the first movement direction or the second movement direction after the time 57, the control device 60 performs the current supply time by the same method as the period from the time t54 to t57. Set. For this reason, the feedback control is continued in a state where a certain load is applied to the output block 30, whereby the current supply time corresponding to the first movement direction and the current supply time corresponding to the second movement direction Have the same value and are gradually extended.

  FIG. 7 shows a state in which the second deviation ΔX2, which is the deviation between the second displacement measurement value XA2 and the target value XT, has converged to 0 due to the feedback control being continued after time t57.

  At time t71, which is one time after time t57, based on the measurement signal SX of the sensor 80, the control device 60 detects that the displacement of the output block 30 has reached the maximum displacement in the second movement direction. Next, the control device 60 determines a small value of the second displacement measurement value XA2 calculated at time t71 and the first displacement measurement value XA1 calculated last, and uses the determined small value for adjustment. The displacement measurement value XAX is set. Next, the control device 60 calculates a deviation ΔX between the displacement measurement value XAX for adjustment and the target value XT, and sets a current supply time based on the deviation ΔX. The deviation ΔX calculated at this time is substantially zero.

  Next, the controller 60 starts output of current from the drive circuit 70 at a predetermined timing, and continues to output current according to the current supply time set at that time. The control signal SD is output to The current supply time at this time is longer than the initial value of the current supply time.

  The drive circuit 70 supplies current to the electromagnet 41 during a period from time t72 to time t73, which is one time thereafter. At this time, since the amount of current supplied to the electromagnet 41 is large due to the set current supply time, the first driving force acting on the output block 30 is compared with, for example, immediately after the feedback control is started. Big.

  At time t74, which is one time thereafter, the control device 60 detects that the displacement of the output block 30 has reached the maximum displacement in the second movement direction based on the measurement signal SX of the sensor 80. Next, the control device 60 determines a small value between the first displacement measurement value XA1 calculated at time t74 and the second displacement measurement value XA2 calculated at time t71, and uses the determined small value for adjustment. Set to the measured displacement value XAX. According to the illustrated example, since the second displacement measurement value XA2 is set to the adjustment displacement measurement value XAX, the deviation ΔX calculated by the control device 60 is equal to the first displacement measurement value XA1 and the target value. Unlike the first deviation ΔX1, which is a deviation from XT, it has substantially zero.

  Next, the control device 60 sets a current supply time based on the deviation ΔX, starts outputting current from the drive circuit 70 at a predetermined timing, and continues outputting current according to the set current supply time. As described above, the control signal SD is output to the drive circuit 70. The current supply time at this time is longer than the initial value of the current supply time.

  The drive circuit 70 supplies current to the electromagnet 41 during a period from time t75 to time t76, which is one time thereafter. At this time, since the amount of current supplied to the electromagnet 41 is large due to the long current supply time, the second driving force acting on the output block 30 is larger than that immediately after the feedback control is started, for example.

  As described above, it is assumed that the load acting on the output block 30 increases in the state where the second deviation ΔX2 converges to zero. In this case, since the first driving force acting on the output block 30 is large unlike the vibration type actuator of the comparative example, the maximum displacement in the first movement direction is unlikely to decrease. For this reason, the first deviation ΔX1 in the first movement direction is unlikely to increase rapidly compared to the vibration type actuator of the comparative example.

  After the load of the output block 30 increases, the current supply time is adjusted so that the deviation ΔX between the first displacement measurement value XA1 or the second displacement measurement value XA2 and the target value XT converges to zero. In this case, since the amount of decrease in the first displacement measurement value XA1 and the second displacement measurement value XA2 as the load increases is smaller than that of the vibration type actuator of the comparative example, the deviation ΔX converges to 0 in a relatively short time. . For this reason, the capability regarding the cutting | disconnection of the hair in the clipper 100 cannot fall easily.

  As described above, according to the vibration type actuator 10, a smaller value of the first displacement measurement value XA1 and the second displacement measurement value XA2 is used for adjusting the current amount as the operation amount. For this reason, one of the operation amount corresponding to the first movement direction and the operation amount corresponding to the second movement direction has a smaller value than the other because the actual characteristics of the springs 50 are different from each other. The set situation is difficult to form. For this reason, one of the first driving force and the second driving force is less likely to be set to a value smaller than the preferred driving force due to the influence of the tolerance of each spring 50 and the like. For this reason, even if the load acting on the output block 30 increases, the deviation ΔX between the displacement and the target value TX is difficult to increase. For this reason, even if the load fluctuates, the output block 30 can maintain a stable reciprocating motion.

  In this example, the state where the second deviation ΔX2 converges to 0 is taken as an example, but even when the load of the output block 30 increases in the state where the first deviation ΔX1 converges to 0, The same effect can be obtained. Further, the same effect can be obtained when the load on the output block 30 increases before one of the first deviation ΔX1 and the second deviation ΔX2 converges to zero.

According to the vibration type actuator 10, the following effects can be further obtained.
(1) The target value TX corresponding to the first movement direction and the target value TX corresponding to the second movement direction are set to the same value based on the specifications of the spring 50. For this reason, the actual characteristic of each spring 50 is measured in advance, and the target value TX corresponding to the first movement direction and the target value TX corresponding to the second movement direction are individually adjusted so as to match each characteristic. Compared to the setting case, the program can be easily constructed.

  (2) Each time the movement direction of the output block 30 is switched, the displacement measurement value XAX for adjustment is updated. For this reason, even if the relationship between the first displacement measurement value XA1 and the second displacement measurement value XA2 changes frequently due to the fluctuation of the load, the smaller value of these measurement values is the displacement measurement for adjustment. The situation set to the value XAX is easily maintained. For this reason, when the output block 30 moves in the first movement direction or the second movement direction, the deviation ΔX hardly increases rapidly. For this reason, the capability regarding the cutting | disconnection of the hair in the clipper 100 is hard to fall further.

(Embodiment 2)
With reference to FIG. 8, the control apparatus 60 of Embodiment 2 is demonstrated. The control device 60 is different from the control device 60 of the first embodiment in that a program described below is executed instead of the program executed by the control device 60 of the first embodiment. According to the vibration type actuator 10 of the second embodiment, the same effect as that obtained by the vibration type actuator 10 of the first embodiment can be obtained.

In step S21, the comparison unit 62 operates. The comparison unit 62 reads the first deviation ΔX1 and the second deviation ΔX2 calculated last from the storage unit.
In step S22, the comparison unit 62 operates. The comparison unit 62 determines a deviation that contributes to setting a relatively large operation amount based on the first deviation ΔX1 and the second deviation ΔX2, and uses the determined deviation for adjusting the operation amount. Set to the deviation ΔX.

  When one of the first deviation ΔX1 and the second deviation ΔX2 is a positive deviation and the other is a negative deviation, the negative deviation is set as the adjustment deviation ΔX. When both the first deviation ΔX1 and the second deviation ΔX2 are positive deviations, a deviation having a small absolute value is set as the adjustment deviation ΔX. When both the first deviation ΔX1 and the second deviation ΔX2 are negative deviations, a deviation having a large absolute value is set as the adjustment deviation ΔX.

  When it is determined that the first deviation ΔX1 is a corresponding deviation, the first deviation ΔX1 is set to the adjustment deviation ΔX until the adjustment deviation ΔX is updated next time. On the other hand, when it is determined that the second deviation ΔX2 is a corresponding deviation, the second deviation ΔX2 is set to the adjustment deviation ΔX until the adjustment deviation ΔX is updated next time.

  In step S23, the adjusting unit 63 operates. When the output block 30 moves in the first movement direction or the second movement direction, the adjustment unit 63 sets the current supply time based on the adjustment deviation ΔX set in step S22.

  In step S24, the adjusting unit 63 operates. The adjustment unit 63 generates the control signal SD based on the current supply time set in step S23 and the movement direction measurement value XD calculated by the detection unit 61, and outputs the generated control signal SD to the drive circuit 70. .

  In step S25, the detection unit 61 operates. When the output block 30 is moving in the first movement direction, the detection unit 61 calculates the first displacement measurement value XA1 and the like based on the measurement signal SX, and stores each calculated measurement value in the storage unit. . Further, when the output block 30 is moving in the second movement direction, the detection unit 61 calculates the second displacement measurement value XA2 and the like based on the measurement signal SX and stores each calculated measurement value in the storage unit. To do.

  In step S26, the comparison unit 62 operates. When the output block 30 is moving in the first movement direction, the comparison unit 62 calculates the first deviation ΔX1 based on the first displacement measurement value XA1 and the target value XT calculated in step S25. The calculated first deviation ΔX1 is stored in the storage unit. Further, when the output block 30 is moving in the second movement direction, the comparison unit 62 calculates the second deviation ΔX2 based on the second displacement measurement value XA2 and the target value XT calculated in step S25. Then, the calculated second deviation ΔX2 is stored in the storage unit.

(Modification)
The description regarding each embodiment is an illustration of the form which the control apparatus of the vibration type actuator of this invention, etc. can take, and it does not intend restrict | limiting the form. In addition to the embodiments, the control device for the vibration type actuator of the present invention can take, for example, modifications of the embodiments shown below.

The modified example of the control device 60 updates the displacement measurement value XAX for adjustment or the deviation ΔX for adjustment every cycle or a plurality of cycles of the reciprocating motion of the output block 30.
The modified example of the control device 60 executes feedback control in which the speed or acceleration of the output block 30 is set as the control amount.

The modification of the control device 60 sets the target value XT in the first movement direction and the target value XT in the second movement direction to different values.
The modification of the control device 60 adjusts the amount of current supplied to the electromagnet 41 by adjusting a parameter different from the current supply time.

-The modification of the control apparatus 60 performs another feedback control instead of PID control. An example of other feedback control is P control, PD control, or PI control.
The modification of the control device 60 includes a circuit having substantially the same function as the program executed by the control device 60 of the first or second embodiment.

  A modification of the vibration type actuator 10 includes an electromagnet attached to the output block 30 instead of the driving magnet 31. Another modification based on this modification includes a permanent magnet attached to the even block 40 instead of the electromagnet 41. The control device 60 corresponding to these modifications causes the output block 30 to reciprocate by controlling the current supplied to the electromagnet of the output block 30 according to the current supplied to the electromagnet 41.

  The modification of the vibration type actuator 10 includes another sensor that can detect the displacement of the output block 30 instead of the electromagnetic induction type sensor 80. An example of another sensor is an optical sensor.

A modification of the vibration type actuator 10 includes a sensor that detects speed or acceleration that is motion information of the output block 30.
-The modification of the clipper 100 has a structure in which the body 110 and the head unit 120 are integrated.

  -The modification of an electric device is a shaver or an electric toothbrush.

  The control device or the like of the vibration type actuator can be applied to various electric devices, and an example thereof is a clipper, a shaver, or an electric toothbrush.

DESCRIPTION OF SYMBOLS 10: Vibration type actuator 20: Frame 30: Output block 31: Drive magnet 32: Detection magnet 33: Output shaft 40: Pair block 41: Electromagnet 42: Core 43: Coil 50: Spring 60: Control device 61: Detection part 62: Comparison unit 63: Adjustment unit 70: Drive circuit 80: Sensor 100: Hair clipper 110: Body 120: Head unit 121: Fixed blade 122: Movable blade 123: Connection unit 130: Power supply 140: Constant voltage source

Claims (12)

A control device for a vibration type actuator,
The vibration type actuator includes a pair of magnetic blocks that reciprocate relatively in a first movement direction and a second movement direction, an output block that is a pair of magnetic blocks, and a spring that supports the output block so as to reciprocate. An electromagnet attached to at least one of the pair of magnetic blocks,
The control device controls a current supplied to the electromagnet so that a vibration system including the output block and the spring vibrates, and a measurement value relating to a displacement, speed, or acceleration of the output block as a control amount; Based on the deviation of the control amount from the target value, feedback control is performed to adjust the amount of current supplied to the electromagnet, which is an operation amount, and the output block moves in the first movement direction. the measured values, using a smaller value ones of said measured value when said output block moves in the second direction of motion, the operation amount and the second movement corresponding to the first direction of movement A control device for a vibration type actuator that adjusts the operation amount corresponding to a direction. A control device for a vibration type actuator,
The vibration type actuator includes a pair of magnetic blocks that reciprocate relatively in a first movement direction and a second movement direction, an output block that is a pair of magnetic blocks, and a spring that supports the output block so as to reciprocate. An electromagnet attached to at least one of the pair of magnetic blocks,
The control device controls a current supplied to the electromagnet so that a vibration system including the output block and the spring vibrates, and a measurement value relating to a displacement, speed, or acceleration of the output block as a control amount; Based on the deviation of the control amount from the target value, feedback control is performed to adjust the amount of current supplied to the electromagnet, which is an operation amount, and the output block moves in the first movement direction. One of the deviation between the measured value and the target value, and the deviation between the measured value and the target value when the output block moves in the second movement direction is a positive deviation, and the other is negative. When it is a deviation, the control unit for the vibration type actuator that adjusts the operation amount corresponding to the first movement direction and the operation amount corresponding to the second movement direction using the negative deviation. Place. The control device adjusts the operation amount by adjusting a current supply time which is a time during which a current is supplied to the electromagnet when the output block moves in the first movement direction or the second movement direction. The control device of the vibration type actuator according to claim 1 or 2. The vibration type actuator further includes a drive circuit for supplying a current to the electromagnet,
The said control apparatus adjusts the said current supply time based on the said deviation, and controls the said drive circuit so that an electric current is supplied to the said electromagnet from the said drive circuit according to the said current supply time. Vibration type actuator control device. The vibration actuator further includes a sensor that detects at least one of a displacement, a speed, and an acceleration of the output block and outputs a measurement signal that changes in accordance with the detection result.
The control device calculates the measurement value when the output block moves in the first movement direction based on the measurement signal detected when the output block moves in the first movement direction. The measurement value when the output block moves in the second movement direction is calculated based on the measurement signal detected when the output block moves in the second movement direction. The control apparatus of a vibration type actuator as described in any one of 1-4. The measured value used for adjusting the manipulated variable is updated every predetermined cycle.
The vibration according to claim 1, claim 3 that cites claim 1, claim 4 that cites claim 3, or claim 5 that cites any one of claims 1, 3, and 4. Type actuator control device.   The negative deviation used for adjusting the manipulated variable is updated every predetermined period.
  6. A vibration type actuator according to claim 2, wherein claim 3 refers to claim 2, claim 4 refers to claim 3, or claim 5 refers to any one of claims 2 to 4. Control device. The predetermined cycle is a cycle in which the movement direction of the output block is switched.
The control device for a vibration type actuator according to claim 6 or 7 . A vibration type actuator provided with the control device according to any one of claims 1 to 8 . An electric device comprising the vibration type actuator according to claim 9 . A program for controlling a vibration actuator,
The vibration type actuator is
An output block and an even block that are a pair of magnetic blocks that reciprocate relatively in a first movement direction and a second movement direction;
A spring that supports the output block for reciprocal movement;
An electromagnet attached to at least one of the pair of magnetic blocks;
The current supplied to the electromagnet is controlled so that the vibration system including the output block and the spring vibrates, and the measured value related to the displacement, speed, or acceleration of the output block, which is a controlled variable, and the target of the controlled variable A control device for performing feedback control for adjusting the amount of current supplied to the electromagnet, which is an operation amount, based on a deviation from the value;
The program is
Causing the control device to calculate a first measurement value that is the measurement value when the output block moves in the first movement direction;
Causing the control device to calculate a second measurement value that is the measurement value when the output block moves in the second movement direction;
A step of adjusting the controller based on the smaller value ones of said operating amount of said first measurement and the second measurement value when the output block moves in the first direction of movement,
And causing the control device to adjust the operation amount when the output block moves in the second movement direction based on the small value. A program for controlling a vibration actuator,
The vibration type actuator is
An output block and an even block that are a pair of magnetic blocks that reciprocate relatively in a first movement direction and a second movement direction;
A spring that supports the output block for reciprocal movement;
An electromagnet attached to at least one of the pair of magnetic blocks;
The current supplied to the electromagnet is controlled so that the vibration system including the output block and the spring vibrates, and the measured value related to the displacement, speed, or acceleration of the output block, which is a controlled variable, and the target of the controlled variable A control device for performing feedback control for adjusting the amount of current supplied to the electromagnet, which is an operation amount, based on a deviation from the value;
The program is
Causing the control device to calculate a first deviation which is a deviation between the measured value and the target value when the output block moves in the first movement direction;
Causing the control device to calculate a second deviation which is a deviation between the measured value and the target value when the output block moves in the second movement direction;
When one of the first deviation and the second deviation is a positive deviation and the other is a negative deviation, the operation amount when the output block moves in the first movement direction is set to the negative deviation. Adjusting the control device based on a deviation of
And causing the control device to adjust the operation amount when the output block moves in the second movement direction based on the negative deviation.