JP5573758B2 - Position detection device - Google Patents

Description

  The present invention includes output means for outputting a detection signal of a rotation angle of a rotor mechanically connected to a detection target, and the rotation angle calculated based on the detection signal is a reference angle. The present invention relates to a position detection device that is used by a specifying unit that specifies the timing of

  This type of rotation angle calculation device calculates an error correlation amount sin (θ−φ) corresponding to the difference between the true electrical angle θ and the calculated rotation angle φ based on the output signal of the resolver, and this error correlation. A device that manipulates the rotation angle φ to feedback control the amount to zero has also been proposed (Patent Document 1, paragraph “0021”).

  Further, as a rotation angle calculation device, a device that outputs a reference signal that notifies the fact that the rotation angle calculated based on the output signal of the resolver becomes the reference angle is also well known. This reference signal is used for calculating the rotation speed and correcting the error of the rotation angle.

JP 2006-292434 A

  By the way, when the rotation angle φ calculated as described above is set to an on-operation amount for feedback control of the error correlation amount to zero, a phenomenon that the rotation angle φ is hunted by feedback control may occur. When the rotation angle φ vibrates between the advance side and the retard side of the reference angle, the reference signal is output a plurality of times. In this case, problems such as a decrease in the calculation accuracy of the rotational speed and the inability to appropriately perform error correction may occur.

  The present invention has been made in the process of solving the above-mentioned problems, and an object of the present invention is to provide an output means for outputting a detection signal of a rotation angle of a rotor mechanically connected to a detection target, and the detection signal. It is an object of the present invention to provide a new position detection device that uses a rotation angle calculated based on the above-described specification means for specifying a timing at which the rotation angle of the rotor becomes a reference angle.

  Hereinafter, means for solving the above-described problems and the operation and effect thereof will be described.

1st invention is provided with the output means which outputs the detection signal regarding the position of the operation part mechanically connected with the detection object, and the position of the said operation part is based on the position calculated based on this detection signal. In the position detection apparatus used by the specifying means for specifying the timing of the position, the change rate of the position calculated according to the detection signal in the defined area including the reference position of the operating unit is determined from the displacement of the detection target. It is characterized by comprising change speed increasing means for making the speed larger than the assumed speed.

  In the above invention, in order to make the change speed of the position in the defined area including the reference position larger than the speed assumed from the displacement of the detection object, the speed at which the value recognized as the position of the detection object passes through the defined area is It becomes faster than expected from the speed of displacement of the detection target. For this reason, it is possible to reduce the probability of occurrence of a situation where the reference position is erroneously recognized multiple times due to noise, or to reduce the probability that the position vibration caused by the feedback control described above occurs at the reference position.

According to a second invention, in the first invention, the detection target is a rotating body, the operating unit is a rotor, and the specifying means is configured such that the rotation angle of the rotor is a reference angle as the reference position. The output means includes an excitation coil excited by a periodic excitation signal and a detection coil interlinked with a magnetic flux generated in the excitation coil, and the excitation signal is By setting the excitation coil, the detection coil, and the rotor so that the magnetic flux interlinking the detection coil fluctuates with the rotation of the rotor when an arbitrary phase other than the amplitude center is obtained. The voltage induced in the detection coil is output as the detection signal, and the detection signal is the signal when the excitation signal is in any phase other than the amplitude center. Assuming that the voltage induced in the output coil changes in a sine wave shape according to the rotation of the rotor, it is used as rotation angle information of the detection target, and the change speed increasing means is the rotor In the specified region including the reference angle, the change rate of the voltage induced in the detection coil when the excitation signal is in an arbitrary phase other than the amplitude center is expressed as a sine according to the rotation of the rotor. It is characterized in that the rate of change is assumed to be greater than the rate of change assumed in the prescribed region when the waveform changes.

According to a third invention, in the second invention, the detection coil is a series connection body of detection coil portions provided corresponding to three or more different rotation angles of the rotor, The change speed increasing means includes a turn number setting means configured by setting the number of turns of the detection coil section.

  The voltage induced in the detection coil depends on the number of flux linkages in the detection coil. For this reason, the voltage induced in the detection coil can be locally changed by the number of turns of the detection coil section. This local change in voltage can then be used to increase the speed at which the detection signal passes through the defined region. In view of this point, the above invention employs the turn number setting means as the change speed increasing means.

In a fourth aspect based on the third aspect , the number-of-turns setting means shifts the rotor toward the side where the absolute value of the voltage of the detection coil increases with respect to the reference angle. And setting the number of turns of at least one of the detection coil portions for the sine wave shape so that a mutual inductance between the excitation coils is larger than that for the sine wave shape. It is characterized by changing.

  According to the setting of the number of turns, when the rotor is shifted to the side where the absolute value of the voltage of the detection coil increases with respect to the reference angle, the mutual inductance becomes larger than that for making a sine wave, and consequently The absolute value of the voltage induced in the detection coil becomes larger than the absolute value of a sine wave. For this reason, the speed at which the detection signal passes through the increasing rotation angle region can be increased.

According to a fifth invention, in the third or fourth invention, the number-of-turns setting means detects the detection when the rotor is shifted to a side where the absolute value of the voltage of the detection coil decreases with respect to the reference angle. At least one turn of the detection coil portion with respect to the sine wave shape so that a mutual inductance between the coil for excitation and the excitation coil is smaller than that for the sine wave shape. The setting is changed.

  According to the setting of the number of turns, when the rotor is shifted to the side where the absolute value of the voltage of the detection coil decreases with respect to the reference angle, the mutual inductance becomes smaller than that for making a sine wave, and consequently The absolute value of the voltage induced in the detection coil is smaller than the sinusoidal absolute value. For this reason, the speed at which the detection signal passes through the decreasing rotation angle region can be increased.

In a sixth aspect based on the third aspect , the reference angle is a rotation angle at which the voltage of the detection coil takes an extreme value, and the turn number setting means determines whether the rotor is positive or negative with respect to the reference angle. With respect to the sine wave shape so that the mutual inductance between the detection coil and the excitation coil when shifted in both rotation directions is smaller than that of the sine wave shape. The setting of the number of turns of at least one of the detection coil sections is changed.

  According to the setting of the number of turns, when the rotor is shifted in both the positive and negative rotation directions with respect to the reference angle, the mutual inductance becomes smaller than that for making a sine wave shape, and is thus induced in the detection coil. The absolute value of the voltage is smaller than the absolute value of a sine wave. For this reason, the speed at which the detection signal passes through the regions on both sides of the reference angle can be increased.

In a seventh aspect based on the sixth aspect , the number-of-turns setting means sets the number of turns equal to or greater than that of the sine wave for the detection coil portion closest to the rotor at the reference angle. It is characterized by doing.

An eighth invention is the invention according to any one of the third to seventh inventions, wherein the detection coil is connected in series with each of the detection coil portions provided corresponding to three or more different rotation angles of the rotor. A pair of series connection bodies having different phases of induced voltage, and the number-of-turns setting means includes at least one of the pair of series connection bodies. It is comprised by the setting of.

According to a ninth invention, in any one of the second to eighth inventions, the excitation coil and the detection coil are provided in a stator, and the rotor is disposed between the excitation coil and the detection coil. The change rate increasing means includes shape setting means configured by setting the shape of at least one of the rotor and the stator. And

  The voltage induced in the detection coil depends on the number of flux linkages in the detection coil. For this reason, it is possible to locally change the voltage induced in the detection coil by changing the mutual inductance from that for making a sine wave at a specific rotation angle. This local change in voltage can then be used to increase the speed at which the detection signal passes through the defined region. On the other hand, the mutual inductance depends on the shapes of the stator and the rotor. In view of this point, the above invention adopts the shape setting means as the change speed increasing means.

In a tenth aspect based on the ninth aspect , the shape setting means rotates the rotor from the reference angle to the side that increases the absolute value of the voltage of the detection coil, and the excitation coil. The shape of the rotor is changed with respect to the sine wave shape so that the mutual inductance between the coils for use is larger than the sine wave shape.

  According to the above setting, the mutual inductance when rotating from the reference angle to the side where the absolute value of the voltage of the detection coil is increased is larger than that for making a sine wave, and as a result, induced in the detection coil. The absolute value of the voltage is larger than the absolute value of a sine wave. For this reason, the speed at which the detection signal passes through the increasing rotation angle region can be increased.

An eleventh invention is characterized in that, in the tenth invention, the rotation directions on the side where the absolute value of the voltage of the detection coil is increased from the reference angle are the respective rotation directions on both sides of the reference angle. To do.

In a twelfth aspect based on the ninth aspect , the shape setting means rotates the rotor from the reference angle to the side where the absolute value of the voltage of the detection coil is reduced, and the excitation coil. The configuration of the rotor shape is changed with respect to the sine wave shape so that the mutual inductance between the coils is smaller than that of the sine wave shape.

  According to the above setting, the mutual inductance when rotating from the reference angle to the side where the absolute value of the voltage of the detection coil is reduced is smaller than that for making a sine wave, and as a result, induced in the detection coil. The absolute value of the voltage is smaller than the absolute value of a sine wave. For this reason, the speed at which the detection signal passes through the decreasing rotation angle region can be increased.

In a thirteenth aspect based on the twelfth aspect , the reference angle is a rotation angle at which the absolute value of the voltage of the detection coil becomes a maximum value, and the shape setting means moves the rotor to both sides of the reference angle. The rotor for the sine wave shape is such that a mutual inductance between the detection coil and the excitation coil is smaller than that for the sine wave shape when rotating each of the rotors. It is characterized by changing the setting of the shape.

  According to the above setting, the mutual inductance becomes smaller than that for making the sine wave shape when rotating to both sides of the reference angle, and the absolute value of the voltage induced in the detection coil is, therefore, the absolute value of the sine wave shape. Smaller than the value. For this reason, the speed at which the detection signal passes through the regions on both sides of the reference angle can be increased.

In a fourteenth aspect based on the thirteenth aspect , the shape setting means has a portion where the distance from the detection coil is minimum when the rotor is at the reference angle in the rotor. The distance from the detection coil is set to be equal to or less than that for the sine wave.

According to a fifteenth aspect, in any one of the ninth to fourteenth aspects, the shape setting means includes rotor shape setting means configured by setting the shape of the rotor.

In a sixteenth aspect based on the ninth aspect , the reference angle increases an absolute value of the voltage of the detection coil when the rotor rotates in a positive direction and a negative direction from the reference angle. The shape setting means includes rotor shape setting means configured by setting the shape of the rotor, and the rotor shape setting means includes the rotor and the rotor at a position where the distance between the rotor and the detection coil is minimum. The distance from the detection coil is set smaller than that for making the sine wave.

  According to the above setting, at the rotation angle at which the absolute value of the voltage of the detection coil increases from the reference angle, the number of flux linkages of the detection coil is larger than that for making a sine wave, and as a result The absolute value of the voltage induced in the coil for use becomes larger than the absolute value of the sine wave shape. For this reason, the speed at which the detection signal passes through the increasing rotation angle region can be increased.

According to a seventeenth aspect, in any one of the ninth to fourteenth aspects, the shape setting means includes a stator shape setting means configured by setting the shape of the stator.

In an eighteenth aspect based on the second aspect , the excitation coil and the detection coil are provided in a stator, and the rotor has a mutual inductance between the excitation coil and the detection coil. The change speed increasing means includes a characteristic distribution setting means configured by setting a magnetic characteristic distribution of a member constituting at least one of the rotor and the stator. It is characterized by that.

  The voltage induced in the detection coil depends on the number of flux linkages in the detection coil. For this reason, it is possible to locally change the voltage induced in the detection coil by changing the mutual inductance from that for making the sine wave at a specific rotation angle. This local change in voltage can then be used to increase the speed at which the detection signal passes through the defined region. On the other hand, the mutual inductance depends on the characteristics of the stator and the rotor. In view of this point, the above invention employs the characteristic setting means as the change speed increasing means.

In a nineteenth aspect based on the first aspect , the detection target is a rotating body, the operating unit is a rotor, and the specifying means is configured such that the rotation angle of the rotor is a reference angle as the reference position. An angle correlation amount calculating means for calculating an angle correlation amount having a correlation with the rotation angle of the rotor based on the detection signal, and feedback control of the angle correlation amount to a target value. Angle calculating means for calculating the rotation angle based on an operation amount, and the change speed increasing means includes gain changing means for changing a gain of the feedback control.

  When the gain of the feedback control is changed, the change speed of the calculated rotation angle can be locally changed. In the above invention, in view of this point, the change speed increasing means is configured by the gain changing means.

In a twentieth aspect based on the second aspect, an angle correlation amount calculating means for calculating an angle correlation amount having a correlation with the rotation angle of the rotor, based on the detection signal;
Angle calculation means for calculating the rotation angle based on an operation amount for feedback control of the angle correlation amount to a target value, and the angle correlation amount calculation means calculates the detection signal by the angle calculation means. By multiplying the detection signal by a pseudo trigonometric function value having the rotation angle as an independent variable, a signal corresponding to an error between the rotation angle of the rotor and the calculated rotation angle is calculated as the angle correlation amount. The change speed increasing means includes function changing means for changing the pseudo trigonometric function value with respect to the trigonometric function value.

  When the pseudo trigonometric function value is changed with respect to the trigonometric function value, the change speed of the calculated rotation angle can be locally changed. In the above invention, in view of this point, the change speed increasing means is configured by the function changing means.

According to a twenty-first aspect, in any one of the second to twentieth aspects, an angular correlation amount calculating means for calculating an angular correlation amount having a correlation with a rotation angle of the rotor based on the detection signal, and the angular correlation amount Angle calculating means for calculating the rotation angle based on an operation amount for feedback control to a target value is further provided.

  In the above-described invention, there is a risk of causing a hunting phenomenon in which the rotation angle calculated between the advance side and the retard side of the reference angle vibrates due to feedback control. And there exists a possibility that the timing used as a reference angle may be specified accidentally several times by the specific means by this. For this reason, the utility value of the change speed increasing means for rapidly passing through the region serving as the reference angle is particularly great.

1 is a system configuration diagram according to a first embodiment. FIG. The figure which shows the structure of the resolver concerning the embodiment. The figure which shows the setting of the number of turns of the coil for a detection concerning 2nd Embodiment. The figure which shows the setting of the number of turns of the coil for a detection concerning 3rd Embodiment. The figure which shows the setting of the number of turns of the coil for a detection concerning 4th Embodiment. The figure which shows the setting of the shape of the rotor concerning 5th Embodiment. The figure which shows the setting of the shape of the rotor concerning 6th Embodiment. The figure which shows the setting of the shape of the rotor concerning 7th Embodiment. The figure which shows the setting of the shape of the stator concerning 8th Embodiment. The figure which shows the characteristic distribution of the rotor concerning 9th Embodiment. The flowchart which shows the procedure of the change process of the feedback control gain concerning 10th Embodiment. The system block diagram concerning 11th Embodiment.

<First Embodiment>
Hereinafter, a first embodiment in which a rotation angle calculation device according to the present invention is applied to a rotation angle calculation device of an in-vehicle main machine will be described with reference to the drawings.

  FIG. 1 shows a system configuration according to the present embodiment.

  The illustrated motor generator 10 is an in-vehicle main machine, and a rotating shaft 10a is mechanically connected to driving wheels (not shown). The motor generator 10 is connected to an inverter INV, and an AC voltage is applied by the inverter INV.

  The rotation shaft 10 a of the motor generator 10 is mechanically connected to the resolver 20. An AC current signal (excitation signal Sc) having an angular velocity ω is input to the resolver 20 from the oscillator 14 to the excitation coil L1. Thereby, signals corresponding to the rotation angle (mechanical angle θM) of the rotation shaft 10a of the motor generator 10 are output to the detection coils L2, L3. More specifically, in the present embodiment, the motor generator 10 having a pole pair number p of “2” is employed, and the detection coils L2 and L3 each have a sinusoidal function sin θ having a period of the electrical angle θ, A voltage signal approximately proportional to the cosine function cos θ is output.

  The output voltages of the detection coils L2, L3 are converted into digital signals SIN, COS by analog-digital converters 30, 32, respectively.

  On the other hand, the cosine function calculation unit 36 calculates a cosine function cos φ having the calculated value (rotation angle φ) of the electrical angle θ of the motor generator 10 as an independent variable. Then, the multiplication unit 34 multiplies the digital signal SIN by a cosine function cosφ as a digital signal. Further, the sine function calculation unit 40 calculates a sine function sin φ having the rotation angle φ as an independent variable. Then, the multiplication unit 38 multiplies the digital signal COS by a sine function sin φ as a digital signal.

  The subtractor 42 calculates the error correlation amount ε by subtracting the output of the multiplier 38 from the output of the multiplier 34. This is a digital value proportional to “sinωt · sin (θ−φ)”. That is, the output voltage of the detection coil L2 is a value proportional to “sin ωt · sin θ”, and the output voltage of the detection coil L3 is a value proportional to “sin ωt · cos θ”. If the proportionality constant is ignored, it is calculated as follows using the addition theorem.

sinωt · sinθ · cosφ + sinωt · cosθ · sinφ
= Sinω ・ sin (θ－φ)
When the error correlation amount ε is zero, the electrical angle θ of the motor generator 10 matches the calculated rotation angle φ.

  The proportional gain multiplication unit 44 multiplies the error correlation amount ε by the proportional gain Kp. The integral gain multiplication unit 46 multiplies the error correlation amount ε by the integral gain Ki. The adder 50 calculates the rotation angle φ by adding the output of the proportional gain multiplier 44 and the output of the integration element 48 that receives the output of the integral gain multiplier 46 as an input. The rotation angle φ is input to the cosine function calculation unit 36 and the sine function calculation unit 40. As a result, the rotation angle φ becomes an operation amount for feedback control of the error correlation amount ε to zero.

  The angle information output unit 52 generates a pair of periodic signals, an A phase signal and a B phase signal, and a Z signal based on the rotation angle φ, and outputs them to the control unit 54. Here, the A-phase signal and the B-phase signal are signals that express the rotation direction by the phase difference and the rotation angle by the pulse. The Z signal is for indicating a specific rotation angle (reference angle θ0) within one cycle of the electrical angle θ. In the present embodiment, the reference angle θ0 is set to 0 °.

  The control unit 54 generates an operation signal for the inverter INV based on the current flowing through the motor generator 10 detected by the current sensor 12 and the signal output from the angle information output unit 52 and outputs the operation signal to the inverter INV. Thereby, the control amount (torque etc.) of the motor generator 10 is controlled. At this time, the control unit 54 calculates the rotational speed of the motor generator 10 based on the time interval at which the Z signal is input, and uses this to control the control amount. Further, based on the time interval at which the Z signal is input, a process for correcting the rotation angle detection error by the resolver 20 is performed. As this correction process, a known technique may be used.

  By the way, since the rotation angle φ is calculated by feedback control, even if the rotation direction of the motor generator 10 is constant, there is a possibility that the rotation angle φ vibrates toward the advance side and the retard side. Here, when the rotation angle φ vibrates between the advance side and the retard side of the reference angle θ0, the Z signal may be erroneously output a plurality of times within a short time. In this case, there is a risk of inconvenience such as a decrease in the calculation accuracy of the rotational speed.

  Therefore, in the present embodiment, the rotational angle φ passes through the reference angle θ0 to be larger than the speed according to the change in the rotational speed (electrical angular velocity) of the motor generator 10, so that the rotational angle φ is the reference angle. Avoid staying near θ0. This can be realized by setting the structure of the resolver 20.

  FIG. 2A shows the configuration of the resolver 20 according to the present embodiment.

  As shown in the figure, the resolver 20 includes an inner rotor type that includes a stator 22 that maintains a stationary state, and a rotor 24 that is positioned inside the stator 22 and mechanically connected to the rotary shaft 10a. belongs to. Here, the stator 22 has a plurality of teeth 22a protruding toward the rotor 24 formed on the circumference of the ring member 22b on the ring at substantially equal intervals. The teeth 22a are linked with the exciting coil portions L1p having the same number of turns. The exciting coil L1 is a series connection body of exciting coil portions L1p.

  Further, the ring member 22b is configured such that the portions sandwiched between the extension lines of the shafts of the pair of teeth 22a are linked to the detection coil portions L2p and L3p. Here, the serial connection body of the detection coil portion L2p is the detection coil L2, and the serial connection body of the detection coil portion L3p is the detection coil L3.

  On the other hand, the rotor 24 has an elliptical shape. The stator 22 and the rotor 24 are both made of a magnetic material.

  The excitation coil portion L1p is adjacent to the excitation coil portion L1p in a loop path that links adjacent excitation coil portions L1p and that is sandwiched between extension lines of the axes. Each direction of the magnetic flux generated by the current flowing through the coil portion L1p is set to be the same.

  FIG. 2B shows the setting of the number of turns of the detection coil portions L2p and L3p of the detection coils L2 and L3 according to the present embodiment. In the figure, the broken line is required to make the voltage induced in the detection coils L2 and L3 proportional to the sine function sin θ and the cosine function cos θ. However, as shown in FIG. 2A, the detection coil portions L2p and L3p are provided for each discrete value of the electrical angle θ. For this reason, the broken line in FIG. 2B is required from the electrical angle θ corresponding to these regions when the detection coil portions L2p and L3p are provided for each region sandwiched between the extension lines of the pair of teeth 22a. It means that it defines the number of turns.

  Here, as the rotor 24 rotates, the distance between the teeth 22a, the exciting coil portion L1p, the detecting coil portions L2p and L3p, and the rotor 24 changes periodically. For this reason, the mutual inductance between the pair of exciting coil portions L1p and the detecting coil portions L2p and L3p sandwiched between the extension lines of these axes periodically changes. For this reason, when the excitation signal Sc as an alternating current signal is input to the excitation coil L1, the voltages induced in the detection coils L2 and L3 also periodically change.

  That is, the voltage induced in the detection coils L2 and L3 is the sum of those generated by the magnetic flux interlinking the detection coil portions L2p and L3p, but the number of turns of each detection coil portion L2p and L3p is different. Therefore, the sum of the mutual inductances of each of the detection coil portions L2p and L3p and the excitation coil portion L1p changes as the rotor 24 rotates. Specifically, since the number of turns of the detection coil portions L2p and L3p changes according to the electrical angle θ, the voltage induced in the detection coils L2 and L3 changes according to the electrical angle θ. In particular, by changing the number of turns to a sine wave shape or a cosine wave shape according to the electrical angle θ, the voltage induced in the detection coils L2 and L3 is proportional to the sine function or cosine function with the electrical angle θ as an independent variable. To be.

However, in the present embodiment, as shown by a one-dot chain line in FIG. 2B, when the rotor 24 is rotated to the side where the voltage of the detection coil L2 is increased from the reference angle θ0, the distance from the rotor 24 is increased. Increases the number of turns of the detection coil portion L2p. Further, when the rotor 24 is rotated to the side where the voltage of the detection coil L2 is decreased with respect to the reference angle θ0, the number of turns of the detection coil portion L2p having the smallest distance from the rotor 24 is decreased. Thereby, in a region where the voltage induced in the detection coil L2 increases when the rotor 24 is shifted from the reference angle θ0, the voltage induced in the detection coil L2 becomes higher than the voltage proportional to the sine function. . In the region where the voltage induced in the detection coil L2 decreases when the rotor 24 is shifted from the reference angle θ0, the voltage induced in the detection coil L2 becomes smaller than the voltage proportional to the sine function. Therefore, for a system set to recognize the correct electrical angle θ when a voltage proportional to a sine function is induced in the detection coil L2, the voltage induced in the detection coil L2 is the reference angle θ0. It is recognized that the voltage changes faster than the voltage change according to the actual change in the electrical angle θ in the vicinity. For this reason, it is possible to shorten the time during which the rotation angle information included in the output signal of the resolver 20 passes near the reference angle θ0 (predetermined region).
<Second Embodiment>
Hereinafter, the second embodiment will be described with reference to the drawings with a focus on differences from the first embodiment.

FIG. 3 shows the setting of the number of turns of the detection coil portions L2p and L3p of the detection coils L2 and L3 according to the present embodiment. As shown in the drawing, in this embodiment, the number of turns of the detection coil portion L3p having the smallest distance from the rotor 24 on both sides of the reference angle θ0 is induced in the detection coil L3. Make the voltage smaller than that required to make the voltage proportional to the cosine function. Thereby, on both sides of the reference angle θ0, the voltage induced in the detection coil L3 becomes smaller than the voltage proportional to the cosine function. For this reason, for a system set to recognize the correct electrical angle θ when a voltage proportional to the cosine function is induced in the detection coil L3, the voltage induced in the detection coil L3 is the reference angle θ0. It is recognized that the voltage changes faster than the voltage change according to the actual change in the electrical angle θ in the vicinity. For this reason, it is possible to shorten the time during which the rotation angle information included in the output signal of the resolver 20 passes near the reference angle θ0 (predetermined region).
<Third Embodiment>
Hereinafter, the third embodiment will be described with reference to the drawings with a focus on differences from the first embodiment.

  FIG. 4 shows the setting of the number of turns of each of the detection coil portions L2p and L3p of the detection coils L2 and L3 according to this embodiment.

In this embodiment, the setting of the number of turns of the detection coil L2 is that of the first embodiment, and the setting of the number of turns of the detection coil L3 is that of the second embodiment.
<Fourth Embodiment>
Hereinafter, the fourth embodiment will be described with reference to the drawings with a focus on differences from the first embodiment.

  FIG. 5 shows the setting of the number of turns of each of the detection coil portions L2p and L3p of the detection coils L2 and L3 according to the present embodiment.

  As shown by the broken line in the figure, in the present embodiment, when the magnetic flux generated in the exciting coil L1 links the detecting coil portions L2p and L3p, the polarity of the voltage generated in the detecting coil portions L2p, The detection coil portions L2p and L3p are set so as to be reversed depending on the arrangement position of L3p. Specifically, the voltages induced in the detection coils L2 and L3 are proportional to the sine function and cosine function and take positive and negative values with the center of amplitude being zero.

In this case, when the reference angle θ0 is 0 °, the absolute value of the voltage induced in the detection coil L2 increases on both sides of the reference angle θ0. For this reason, in this embodiment, the number of turns of the detection coil portion L2p that minimizes the distance from the rotor 24 on both sides of the reference angle θ0 is increased. Thereby, on both sides of the reference angle θ0, the absolute value of the voltage induced in the detection coil L2 becomes larger than the voltage proportional to the sine function. Therefore, for a system set to recognize the correct electrical angle θ when a voltage proportional to a sine function is induced in the detection coil L2, the voltage induced in the detection coil L2 is the reference angle θ0. It is recognized that the voltage changes faster than the voltage change according to the actual change in the electrical angle θ in the vicinity.
<Fifth Embodiment>
Hereinafter, a fifth embodiment will be described with reference to the drawings, focusing on differences from the first embodiment.

  FIG. 6A shows the setting of the number of turns of the detection coil portions L2p and L3p of the detection coils L2 and L3 according to the present embodiment. As shown in the figure, in this embodiment, when the magnetic flux generated in the exciting coil L1 is linked to the detecting coil portions L2p and L3p, the polarity of the voltage generated in these is determined by the location where the detecting coil portions L2p and L3p are arranged. The detection coil portions L2p and L3p are set so as to be reversed by the above. Moreover, the detection coil portion L2p is defined by the number of turns defined by a sine function having the electrical angle θ as an independent variable, and the detection coil portion L3p is defined by a cosine function having the electrical angle θ as an independent variable. The number of turns.

  However, as shown in FIGS. 6B and 6C, in the present embodiment, the outer periphery of the rotor 24 is deformed. In the figure, the shape indicated by the broken line is required for the voltage induced in the detection coil L2 to be a sine function with the electrical angle θ as an independent variable. On the other hand, in the present embodiment, as indicated by the solid line, the shape on both sides of the portion where the distance between the shape indicated by the broken line and the detection coil portion L2 is the smallest is deformed. Specifically, the distance from the center of rotation was extended on both sides of the portion where the major axis of the ellipse indicated by the broken line in the figure intersects the broken line. As described above, the distance is increased on both sides, and is induced in the detection coil L2 by increasing the absolute value of the interlinkage magnetic flux of the detection coil portion L2p on both sides at the reference angle θ0 by an equal amount. This is to maintain the voltage at a value proportional to the sine function.

According to such setting, the average distance between this portion of the rotor 24 and the teeth 22a, the excitation coil L1 and the detection coil L2 is a sine with the voltage induced in the detection coil L2 as an independent variable of the electrical angle θ. It is smaller than required in order to be proportional to the function. In this case, on both sides of the reference angle θ0, the mutual inductance is larger than that required to make it proportional to the sine function. Therefore, the absolute value of the voltage induced in the detection coil L2 is It is larger than that proportional to the sine function.
<Sixth Embodiment>
Hereinafter, the sixth embodiment will be described with reference to the drawings with a focus on differences from the fifth embodiment.

  In the present embodiment, it is assumed that the rotation angle φ is calculated based on the voltage induced in the detection coil L3 in the resolver including only the detection coil L3. In this case, for example, the rotation angle φ can be calculated using the system shown in FIG. 1 by using the detection signal of the resolver including only the detection coil L2.

  FIG. 7A and FIG. 7B show the rotor shape according to this embodiment. As shown in the figure, in the present embodiment, the voltage induced in the detection coil L3 is a cosine function with the electrical angle θ as an independent variable, and the shape (broken line in the figure) is the center of rotation. Shorten the distance between both sides of the part with the longest distance and the center of rotation.

In this case, when the rotor 24 deviates from the reference angle θ0, the average distance between the rotor 24 and the detection coil portion L3p that minimizes the distance from the rotor 24 increases. For this reason, since the mutual inductance between the detection coil L3 and the excitation coil L1 is smaller than that required to be proportional to the cosine function, the voltage induced in the detection coil L3 is It is smaller than the one proportional to the cosine function.
<Seventh Embodiment>
Hereinafter, the seventh embodiment will be described with reference to the drawings with a focus on differences from the fifth embodiment.

FIG. 8 shows the rotor shape according to this embodiment. As illustrated, in this embodiment, the distance between the portion of the rotor 24 where the distance from the rotation center is the longest and the teeth 22a, the excitation coil L1, and the detection coil L2 are set to the detection coil L2. The induced voltage is made smaller than that required to make it proportional to the sine function with the electrical angle θ as an independent variable. In this case, on both sides of the reference angle θ0, the mutual inductance is larger than that required to make it proportional to the sine function. Therefore, the absolute value of the voltage induced in the detection coil L2 is It is larger than that proportional to the sine function.
<Eighth Embodiment>
Hereinafter, the eighth embodiment will be described with reference to the drawings with a focus on differences from the fifth embodiment.

  FIG. 9 shows the structure of the stator 22 according to the present embodiment. In the present embodiment, a part of the region sandwiched between the extension lines of the shafts of a pair of adjacent teeth 22a in the ring member 22b of the stator 22 is different from the other parts. Specifically, the cross-sectional area is made smaller than other parts. This is a technique for increasing the leakage flux. As a result, the amount of magnetic flux generated by the current flowing in the exciting coil L1 that is linked to the pair of teeth 22a on both sides of this region is linked to the detection coil portions L2p and L3p corresponding to this region is reduced. . Therefore, for example, if this region is a region corresponding to both sides of the portion where the distance from the rotor 24 becomes the smallest at the reference angle θ0, the voltage induced in the detection coil L3 is a voltage proportional to the cosine function. Becomes smaller on both sides of the reference angle θ0.

Further, for example, the detection coil portion L2p is set so that the sign of the voltage induced in the detection coil L2 is not reversed, and the voltage induced in the detection coil L2 is reduced in this region from the reference angle θ0. It may be a region where the distance from the rotor 24 becomes the smallest when the rotor 24 is rotated to the side. In this case, the voltage induced in the detection coil L2 is smaller than that in proportion to the sine function in the region on the side of the decrease from the reference angle θ0. For this reason, the passing speed of the area | region on the side to reduce can be enlarged.
<Ninth Embodiment>
Hereinafter, the ninth embodiment will be described with reference to the drawings with a focus on differences from the fifth embodiment.

FIG. 10 shows a rotor according to this embodiment. As shown in the drawing, in the present embodiment, the characteristics in the vicinity of the portion of the rotor 24 where the distance from the rotation center is longest are changed. Specifically, the magnetic permeability is increased in a region having an equal distance on both sides of the portion where the distance is the longest. In this case, on both sides of the reference angle θ0, the mutual inductance is larger than that required to make it proportional to the sine function. Therefore, the absolute value of the voltage induced in the detection coil L2 is It is larger than that proportional to the sine function.
<Tenth Embodiment>
Hereinafter, the tenth embodiment will be described with reference to the drawings with a focus on differences from the first embodiment.

  In the present embodiment, by changing the proportional gain Kp and the integral gain Ki shown in FIG. 1, the speed at which the rotation angle φ passes the reference angle is made larger than that assumed from the rotation speed of the rotary shaft 10a. To do.

  FIG. 11 shows a procedure of gain change processing according to the present embodiment. This process is repeatedly executed, for example, at a predetermined cycle by hardware means including the proportional gain multiplication unit 44 and the integral gain multiplication unit 46.

  In this series of processes, first, in step S10, it is determined whether or not the rotation angle φ is in a region (θ0−Δ ≦ φ ≦ θ0 + φ) within a specified amount Δ from the reference angle θ0. If an affirmative determination is made in step S10, the proportional gain Kp and the integral gain Ki are changed in step S12. Here, for example, when the error correlation amount ε is positive immediately before the reference angle θ0 in a situation where the rotation angle φ is increasing, the rotation angle is increased by increasing the proportional gain Kp and the integral gain Ki. It is sufficient that φ passes through the reference angle θ0 quickly. Depending on the sign of the error correlation amount ε, processing such as inverting the signs of the proportional gain Kp and the integral gain Ki is also effective.

Incidentally, when the process of step S12 is completed or when a negative determination is made in step S10, this series of processes is temporarily terminated.
<Eleventh embodiment>
Hereinafter, the eleventh embodiment will be described with reference to the drawings, centering on differences from the first embodiment.

In the present embodiment, a pseudo cosine function calculator 36a and a pseudo sine function calculator 40a are provided instead of the cosine function calculator 36 and the sine function calculator 40 shown in FIG. Here, the pseudo cosine function calculation unit 36a basically calculates a cosine function value having the rotation angle φ as an independent variable, but calculates values smaller than the cosine function value on both sides of the reference angle θ0. In addition, the pseudo sine function calculation unit 40a basically calculates a sine function value having the rotation angle φ as an independent variable, but calculates an absolute value larger than the sine function value in the vicinity of the reference angle θ0.
<Other embodiments>
Each of the above embodiments may be modified as follows.

“About the number of coils for detection”
The number of detection coil portions in the rotation angle region corresponding to one cycle of the voltage induced in the detection coil is not limited to the one grasped from the configuration shown in FIG. It is possible to simulate a sine function or a cosine function by providing a detection coil unit having a different number of turns at an angle corresponding to either a maximum value or a minimum value and an angle corresponding to a pair of amplitude center values. In view of the above, any configuration may be adopted as long as the detection coil units are provided at three or more different locations.

  However, the fact that only one detection coil portion may be used is as described in the section “About the rotor shape setting means”.

"Turn number setting method"
In the first embodiment or the like, only one of the number of turns on the side where the voltage increases from the reference angle θ0 and the number of turns on the side where the voltage decreases may be changed in the detection coil L2.

  In the second embodiment (FIG. 3), the number of turns of the detection coil portion L3p corresponding to the reference angle may be larger than that for making a sine wave. This is particularly effective when the interval between the teeth 22a is reduced to reduce the change rate of the number of turns of the detection coil portion L3p per interval between the teeth 22a. That is, in this case, the number of turns of the detection coil portion L3p on both sides of the reference angle θ0 is made smaller than that of the sine wave, so that the voltage induced in the detection coil L3 at the reference angle θ0 is the maximum of the sine wave. May be smaller than the value. For this reason, this can be compensated by increasing the number of turns of the detection coil portion L3p corresponding to the reference angle θ0.

  It is not restricted to what changes the number of turns of the coil part for detection in which the distance with a rotor becomes the smallest to what makes a sine wave. If the mutual inductance becomes larger than the sine wave when the rotor is shifted to the side where the absolute value of the voltage of the detection coil increases with respect to the reference angle, the number of turns of the detection coil section at any location You can change it.

  The present invention is not limited to the one that uses the change in mutual inductance between the exciting coil and the detecting coil accompanying the change in the distance to the rotor 24. For example, an excitation coil may be provided on the rotor, and a periodic voltage signal may be given to the rotor as an excitation signal. In this case, when the number of turns of the detection coil located in the axial direction of the excitation coil changes, the number of flux linkages of the detection coil changes, and as a result, the voltage of the detection coil can be changed. Therefore, the turn number setting means is effective even in such a case.

  The detection coil is not limited to the one provided on the stator. That is, for example, even if the stator 22 in FIG. 2A is connected to the rotary shaft 10a and the rotor 24 is fixed, the same effects as in the first embodiment can be obtained.

"About rotor shape setting means"
In the sixth embodiment (FIG. 7), the sign of the number of turns of the detection coils L2, L3 may be set not to be inverted.

  In the seventh embodiment (FIG. 8), the shape of the rotor 24 may be changed from one of the pair of ends on the long axis side when the rotor 24 is an ellipse.

  The rotation angle region corresponding to one cycle of the voltage induced in the detection coil is not limited to a configuration provided with the detection coil units at three or more different locations. For example, the detection coil may be arranged in one place. Even in this case, when the rotor is rotated from the reference angle to the side where the absolute value of the voltage of the detection coil is increased, the distance from the detection coil is set at the rotor portion where the distance from the detection coil is minimized. By setting the value smaller than that for the sine wave, it is possible to increase the rate of change of the voltage induced in the detection coil in the region of the increasing rotation direction. Further, when the rotor is rotated from the reference angle to the side where the absolute value of the voltage of the detection coil is decreased, the distance from the detection coil is made a sine wave at the rotor portion where the distance from the detection coil is minimized. It is also effective to set a value larger than the above.

"Stator shape setting means"
As illustrated in the eighth embodiment (FIG. 9), the leakage magnetic flux is changed by changing the shape of the portion sandwiched between the extension lines of the shafts of the adjacent pair of teeth 22a in the ring member 22b. Not exclusively. For example, the average distance between a part of the teeth 22a and the rotor 24 may be made different from the others by changing the length of the teeth 22a in the axial direction. Specifically, for example, the tooth 22a corresponding to the side where the absolute value of the voltage of the detection coil increases is extended from the position where the longest distance from the rotation center of the rotor 24 is taken at the reference angle θ0. Or the tooth 22a corresponding to the side where the absolute value decreases may be shortened. In the case of this configuration, the sign of the number of turns of the detection coils L2 and L3 may be set not to be inverted, and the reference angle θ0 is shifted from the phase that is the amplitude center of the voltage induced in the detection coil, for example. May be.

"Characteristic distribution setting method"
The broken line portion in FIG. 7A may be the outer periphery of the rotor, and the magnetic permeability of the portion between the broken line and the solid line may be smaller than the others.

  As illustrated in the ninth embodiment (FIG. 10), the configuration is not limited to the configuration of the magnetic characteristic distribution of the rotor 24, but may be the configuration of the magnetic characteristic distribution of the stator 22. Good.

"Gain changing means"
It is not limited to changing two of the proportional gain Kp and the integral gain Ki, and either one may be used. Further, when the angle calculation means calculates the rotation angle φ by the sum of the outputs of the proportional element, the integral element, and the differential element, the differential gain may be changed.

"Function change means"
In the eleventh embodiment (FIG. 12), the pseudo sine function calculating unit 40a and the pseudo cosine function calculating unit 36a are provided to change both the sine function and the cosine function. One may be sufficient.

  Moreover, it is good also as a thing of "about an angle correlation amount calculation means."

"Angle correlation calculation method"
For example, the difference between the output signal of the multiplier 30 and “(sin 2φ) / 2” may be used as an error correlation amount, and this may be feedback-controlled to zero. In this case, if function changing means is employed, at least one of “sin φ” and “sin 2 φ” may be changed.

  The angle correlation amount is not limited to the one that calculates the error correlation amount (the target value is zero). For example, the output signal of the subtracting unit 42 when φ = “θ−π / 4” may be used as the angle correlation amount. In this case, the rotation angle φ is calculated as an operation amount for performing feedback control of the angle correlation amount to the target value “1 / √2”.

  Further, the feedback operation amount is not limited to the direct rotation angle φ. For example, the feedback manipulated variable is used when calculating the final rotation angle φ using the rotation angle φ1 calculated based on the inverse trigonometric function of the output values of the analog-digital converters 30 and 32 shown in FIG. It may be a thing. Specifically, for example, the previous value of the final rotation angle φ is set as an angle correlation amount, and the operation amount for performing feedback control to the current rotation angle φ1 that is the target value is obtained by differential calculation of the rotation angle φ1. The current rotation angle φ may be calculated by correcting a value obtained by performing an integral operation after low-pass filter processing is performed on the calculated rotation speed.

"Reference angle"
The detection target (motor generator 10) is not limited to one rotation of the electrical angle θ. For example, in the first embodiment, a motor generator 10 having a pole pair number p of “1” may be employed. Even in this case, the reference angle θ0 may be defined to output the Z signal once in one electrical angle cycle, but the reference angle θ0 is defined twice, and each of these is given to the control unit 54. You may make it output. A plurality of reference angles may be provided within one cycle of the voltage signal induced in the detection coil.

About specific means
What is not limited to the one that outputs the Z signal is as described in the column “Regarding Reference Angle”.

  Further, for example, when performing rectangular wave control for switching the switching state once in a half cycle of the electrical angle for each phase, means for specifying the rotation angle of this switching as a reference angle may be used. Even in such a case, it is effective to provide the change speed increasing means so that the switching timing of the switching state is not erroneously specified a plurality of times in a short time. In this case, the specifying unit itself may be mounted on the control unit 54 without being mounted on the angle information output unit 52. However, in the case where the angle information output unit 52 and the control unit 54 are separate hardware units connected by a communicable signal line, the control unit 54 may include a specifying unit on the angle information output unit 52 side. This is desirable from the viewpoint of reducing the calculation load when the control amount of the motor generator 10 is controlled.

“Excitation signal”
It is not limited to one having a fixed angular velocity ω. For example, in order to reduce the peak value of the sound pressure caused by the excitation signal in the audible frequency band, the angular velocity ω may be varied by adopting a spread spectrum technique. Even in this case, the detection signal including the rotation angle information can be appropriately extracted by synchronizing the sampling timing of the detection coil voltage with one phase of the excitation signal.

  For example, a noise voltage signal may be superimposed on the excitation signal Sc according to the first embodiment. Even in this case, for the system side that performs processing for sampling the voltage of the detection coil and calculating the rotation angle φ, the sampling timing of the voltage of the detection coil is synchronized with one phase of the periodic excitation signal. If it is equivalent to the above, the rotation angle φ can be detected appropriately.

"Angle calculation means"
The fact that the rotation angle φ is not necessarily calculated as the sum of the proportional elements of the difference between the angle correlation amount and the target value and the outputs of the integral elements is as described in the “Regarding gain changing means” column.

  Further, even if the rotation angle φ is not calculated based on the feedback operation amount, a change speed increasing unit is provided in order to avoid that the reference unit θ0 is erroneously specified a plurality of times by the specifying unit due to noise or the like. It is effective.

"About output means"
One rotation of the rotor is not limited to one corresponding to two cycles of fluctuation of the voltage of the detection coil, and may correspond to one cycle or three cycles or more.

  Moreover, not only an inner rotor type but an outer rotor type may be used.

"Detection target"
It is not limited to a rotating body. For example, it may be a case that changes linearly. Even in this case, in the case where the predetermined processing is performed by becoming the reference position, since the inconvenience occurs when the reference position is erroneously detected a plurality of times, the linear position for detecting the position of the detection target It is effective to apply change rate increasing means to the sensor.

  DESCRIPTION OF SYMBOLS 20 ... Resolver, 22 ... Stator, 24 ... Rotor, 44 ... Proportional gain Kp, 46 ... Integration gain, 48 ... Integration element, 50 ... Addition part, 52 ... Angle information output part, L1 ... Excitation coil, L2, L3 ... Coil for detection.

Claims (18)

An output means for outputting a detection signal relating to the position of the operating part mechanically connected to the detection target is provided, and the position calculated based on the detection signal is determined when the position of the operating part becomes the reference position In the position detection device used for the specific means to
In a specified region including the reference position of the operating unit, the apparatus includes a change speed increasing unit that makes a change speed of a position calculated according to the detection signal larger than a speed assumed from the displacement of the detection target ,
The detection target is a rotating body,
The operating part is a rotor,
The specifying means is means for specifying a timing at which the rotation angle of the rotor becomes a reference angle as the reference position;
The output means includes an excitation coil that is excited by a periodic excitation signal, and a detection coil that links the magnetic flux generated in the excitation coil, and the excitation signal has an arbitrary phase other than the amplitude center. When the excitation coil, the detection coil, and the rotor are set so that the magnetic flux interlinking the detection coil fluctuates with the rotation of the rotor, it is induced in the detection coil A voltage is output as the detection signal,
The detection signal is based on the assumption that the voltage induced in the detection coil when the excitation signal is in an arbitrary phase other than the amplitude center changes sinusoidally according to the rotation of the rotor. It is used as target rotation angle information,
The change speed increasing means is configured to determine a voltage change speed induced in the detection coil when the excitation signal is in an arbitrary phase other than the amplitude center in a specified region including a reference angle of the rotor. Is greater than the rate of change assumed in the specified region when the sine wave changes according to the rotation of the rotor,
The detection coil is a series connection body of detection coil portions provided corresponding to three or more different rotation angles of the rotor,
The position detecting device, wherein the change speed increasing means includes a turn number setting means configured by setting the number of turns of the detection coil section. The turn number setting means has a mutual inductance between the detection coil and the excitation coil when the rotor is shifted to the side where the absolute value of the voltage of the detection coil increases with respect to the reference angle. as larger than for a sine wave, according to claim 1, wherein the changing at least one turn number of settings of the detection coil unit with respect to those for the said sinusoidal Position detector. The turn number setting means has a mutual inductance between the detection coil and the excitation coil when the rotor is shifted to the side where the absolute value of the voltage of the detection coil decreases with respect to the reference angle. as smaller than for a sine wave, claim 1, wherein the changing at least one turn number of settings of the detection coil unit with respect to those for the said sinusoidal or 2. The position detection device according to 2 . The reference angle is a rotation angle at which the voltage of the detection coil is an extreme value,
The turn number setting means is for the mutual inductance between the detection coil and the excitation coil when the rotor is shifted in both the positive and negative rotation directions with respect to the reference angle to make the sinusoidal shape. even so small, the position detecting device according to claim 1, wherein the changing at least one turn number of settings of the detection coil unit with respect to those for the said sinusoidal. 5. The position according to claim 4, wherein the turn number setting means sets the number of turns equal to or greater than that of the sine wave for the detection coil portion closest to the rotor at the reference angle. Detection device. The detection coil is a series connection body of detection coil portions provided corresponding to three or more different rotation angles of the rotor, and a pair of induced voltages having different phases. With a series connection of
The said number-of-turns setting means is comprised by the setting of the number of turns of the said coil for a detection which comprises at least one of a pair of said serial connection body, The any one of Claims 1-5 characterized by the above-mentioned. Position detection device. The excitation coil and the detection coil are provided in a stator,
The rotor changes the mutual inductance between the excitation coil and the detection coil as the detection target rotates,
The position detecting device according to claim 1 , wherein the change speed increasing unit includes a shape setting unit configured by setting a shape of at least one of the rotor and the stator. The shape setting means is configured such that a mutual inductance between the detection coil and the excitation coil when the rotor is rotated from the reference angle to the side where the absolute value of the voltage of the detection coil is increased is a sinusoidal shape. The position detecting device according to claim 7 , wherein the setting of the shape of the rotor is changed with respect to the sine wave shape so as to be larger than the sine wave shape. 9. The position detection device according to claim 8 , wherein the rotation direction on the side where the absolute value of the voltage of the detection coil is increased from the reference angle is the rotation direction on each side of the reference angle. The shape setting means is configured so that a mutual inductance between the detection coil and the excitation coil when the rotor is rotated from the reference angle to a side where the absolute value of the voltage of the detection coil is decreased is a sinusoidal shape. The position detecting device according to claim 7 , wherein the setting of the shape of the rotor is changed with respect to the sine wave shape so as to be smaller than that for the sine wave. The reference angle is a rotation angle at which the absolute value of the voltage of the detection coil is a maximum value,
The shape setting means is configured so that a mutual inductance between the detection coil and the excitation coil is smaller than that for making the sine wave when the rotor is rotated on both sides of the reference angle. The position detection device according to claim 10 , wherein the setting of the shape of the rotor is changed with respect to the sine wave shape. The shape setting means sets the distance between the portion and the detection coil to be the sine wave shape for a portion of the rotor that has a minimum distance from the detection coil when the rotor is at the reference angle. The position detection device according to claim 11 , wherein the position detection device is set to be equal to or less than that for the position detection device. The position detection device according to claim 7 , wherein the shape setting unit includes a rotor shape setting unit configured by setting the shape of the rotor. The reference angle increases the absolute value of the voltage of the detection coil when the rotor rotates in the positive direction and the negative direction from the reference angle,
The shape setting means includes rotor shape setting means configured by setting the shape of the rotor,
The rotor shape setting means sets the distance between the rotor and the detection coil at a position where the distance between the rotor and the detection coil is a minimum than that for making the sine wave shape. The position detection device according to claim 7 . The position detection device according to claim 7 , wherein the shape setting unit includes a stator shape setting unit configured by setting a shape of the stator. An output means for outputting a detection signal relating to the position of the operating part mechanically connected to the detection target is provided, and the position calculated based on the detection signal is determined when the position of the operating part becomes the reference position In the position detection device used for the specific means to
In a specified region including the reference position of the operating unit, the apparatus includes a change speed increasing unit that makes a change speed of a position calculated according to the detection signal larger than a speed assumed from the displacement of the detection target,
The detection target is a rotating body,
The operating part is a rotor,
The specifying means is means for specifying a timing at which the rotation angle of the rotor becomes a reference angle as the reference position;
An angle correlation amount calculating means for calculating an angle correlation amount having a correlation with the rotation angle of the rotor based on the detection signal;
Angle calculating means for calculating the rotation angle based on an operation amount for feedback control of the angle correlation amount to a target value;
The position detecting device, wherein the change speed increasing means includes gain changing means for changing a gain of the feedback control. An output means for outputting a detection signal relating to the position of the operating part mechanically connected to the detection target is provided, and the position calculated based on the detection signal is determined when the position of the operating part becomes the reference position In the position detection device used for the specific means to
In a specified region including the reference position of the operating unit, the apparatus includes a change speed increasing unit that makes a change speed of a position calculated according to the detection signal larger than a speed assumed from the displacement of the detection target,
The detection target is a rotating body,
The operating part is a rotor,
The specifying means is means for specifying a timing at which the rotation angle of the rotor becomes a reference angle as the reference position;
The output means includes an excitation coil that is excited by a periodic excitation signal, and a detection coil that links the magnetic flux generated in the excitation coil, and the excitation signal has an arbitrary phase other than the amplitude center. When the excitation coil, the detection coil, and the rotor are set so that the magnetic flux interlinking the detection coil fluctuates with the rotation of the rotor, it is induced in the detection coil A voltage is output as the detection signal,
The detection signal is based on the assumption that the voltage induced in the detection coil when the excitation signal is in an arbitrary phase other than the amplitude center changes sinusoidally according to the rotation of the rotor. It is used as target rotation angle information,
The change speed increasing means is configured to determine a voltage change speed induced in the detection coil when the excitation signal is in an arbitrary phase other than the amplitude center in a specified region including a reference angle of the rotor. Is greater than the rate of change assumed in the specified region when the sine wave changes according to the rotation of the rotor,
An angle correlation amount calculating means for calculating an angle correlation amount having a correlation with the rotation angle of the rotor based on the detection signal;
Angle calculating means for calculating the rotation angle based on an operation amount for feedback control of the angle correlation amount to a target value;
The angle correlation amount calculating unit multiplies the detection signal by a pseudo trigonometric function value having the rotation angle calculated by the angle calculating unit as an independent variable to the detection signal, thereby calculating the rotation angle of the rotor. A signal corresponding to an error with the rotation angle is calculated as the angle correlation amount,
The position detecting device, wherein the change speed increasing means includes function changing means for changing the pseudo trigonometric function value with respect to the trigonometric function value. An angle correlation amount calculating means for calculating an angle correlation amount having a correlation with the rotation angle of the rotor based on the detection signal;
Angle calculation means for calculating the rotation angle based on an operation amount for feedback control of the angle correlation amount to a target value;
Further comprising a position detecting device according to any one of claims 1 to 17, characterized in.

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