KR20090114586A - System and method of controlling location of a member - Google Patents

Abstract

PURPOSE: A system and a method for controlling a position are provided to prevent damage to compositional elements by changing a duty ratio in blocking a power supply or in supplying an initial power. CONSTITUTION: A system for controlling a position includes a rotating device(402) and a control part(400). The rotating device has a rotary shaft. The control part is connected to the rotating device. The control part controls an operation of the rotating device by applying a fixed power to the rotating device. The control part changes a duty ratio in blocking a power supply or in supplying an initial power. The rotary shaft is connected to an external device having a position variable member. A position of the position variable member is changed in response to rotation of the rotary shaft. The rotating device is a DC motor. The external device is a phase shifter.

Description

Position Control System and Method {SYSTEM AND METHOD OF CONTROLLING LOCATION OF A MEMBER}

The present invention relates to a position control system and method, and more particularly to a position control system and method capable of precisely controlling the position of the variable position member at low cost.

The position control system is a system for controlling the positional movement of the variable position member for varying the phase and the like, for example, to control the positional movement of the position variable member included in the phase shifter as shown in the following figures. do.

1 and 2 are views showing the front and rear of a typical phase shifter, Figure 3 is a view showing a tilt angle adjusting device connected to the phase shifter.

1 and 2, the phase shifter is a device for varying the phase of an RF signal input through an input line 106, and includes a dielectric substrate 100, a first line 102, and a second line 104. ), The input line 106, the output line 108, the rotary shaft 110, the variable position member (arm portion 112), the guide member 114, the first rotating member 200 and the second rotating member 202 Include.

An apparatus for controlling the phase shifter to control the radiating elements connected to the phase shifter is the inclination angle adjusting device 300 shown in FIG. 3.

The tilt angle adjusting device 300 is composed of a body portion 302, a drive member 304 and a force transmission member 306, in particular the force transmission member 306 and the second rotating member 202 of the phase shifter Connected.

Hereinafter, a process of controlling the positional movement of the phase variable member 112 through the inclination angle adjusting device 300 will be described in detail.

A motor, for example a DC motor, is inserted into the hole 308 formed in the drive member 304 to rotate the drive member 304.

Subsequently, the rotational force by the drive member 304 is transmitted to the second rotation member 202 of the phase shifter through the force transmission member 306.

Subsequently, the first rotating member 200 engaged with the second rotating member 202 is rotated, and as a result, the rotating shaft 110 coupled with the first rotating member 200 is rotated.

Then, since the variable position member 112 and the guide member 114 are coupled with the rotary shaft 110, the variable position member 112 and the guide member 114 are connected to the tracks in response to the rotation of the rotary shaft 110. Position along 102 and 104).

As a result, the phase of the RF signal input through the input line 106 is changed, and the direction of the radiation pattern output from the radiation elements electrically connected to the ends of the lines 102 and 104 may be changed.

That is, the conventional position control system has changed the position of the variable position member 112 by using a motor. Here, when the motor is a DC motor, the system installation cost is reduced because the DC motor is inexpensive, while the position movement of the variable position member 112 cannot be precisely controlled due to the characteristics of the DC motor.

Of course, a high-precision motor can be used for precise position control of the variable position member 112, but the cost of the system is increased.

In addition, when driving a DC motor, at first, a current much larger than that of a normal operation must be applied at a time, and as a result, overshooting occurs. This overshooting phenomenon causes damage to the motor or the circuit driving the motor.

Further, when it is determined that the position movement is completed and the current supply is cut off, since the current supply is cut off at once, back electromotive force is generated, which may damage the circuit driving the motor.

It is an object of the present invention to provide a position control system and method for precisely controlling the positional movement of a variable position member using a low cost motor.

In order to achieve the above object, a position control system according to an embodiment of the present invention comprises a rotating element having a rotation axis; And a controller electrically connected to the rotating element, and controlling a operation of the rotating element by applying a predetermined power to the rotating element. Here, the rotating shaft is connected to an external element having a variable position member, the position of the variable position member is moved in response to the rotation of the rotary shaft, the control unit is the duty ratio at the initial application of the power source or the power off The corresponding power is provided to the rotating element with varying duty rates.

Position control system according to another embodiment of the present invention is connected to an external element having a variable position member, the rotation element having a rotation axis; A control unit electrically connected to the rotating element and configured to control an operation of the rotating element by applying a predetermined power to the rotating element; And a sensing unit configured to sense the number of rotations of the rotating shaft and provide pulses corresponding to the detection result to the controller. Here, the position of the variable position member is variable in response to the rotation of the rotation axis, the control unit is the number of first pulses corresponding to the change value to the first position when moving the position variable element to the first position Set the power supply and provide the first power to the rotating element, the sensing unit detects the number of revolutions of the rotating shaft according to the provision of the first power and provides the second pulses to the control unit according to the detection result, The control unit compensates for the difference of the number of the first pulses and the second pulses when moving the position variable element from the first position to the second position, and corresponds to a third pulse corresponding to the change value to the second position. Set the number of fields.

A position control method according to an embodiment of the present invention includes the steps of setting the number of first pulses for moving the variable position member to the first position; Providing a power source corresponding to the change value to the first position to the rotating device to rotate the rotating shaft of the rotating device; Sensing the number of revolutions of the rotary shaft and outputting second pulses according to the detection result; And setting third pulses for moving the variable position member from the first position to the second position. Here, the third pulses are set to be compensated by the difference between the number of the first pulses and the second pulses.

Since the position control system and method according to the present invention consider the compensation pulse according to the previous position change in the new position movement, there is an advantage that the position movement of the variable position member can be precisely controlled at low cost.

In addition, the position control system and method supplies power by varying the duty ratio in stages when the initial power is applied or when the power supply is cut off, thereby preventing damage to the components of the system.

In addition, the position control system and method detects when the rotating element does not drive even when the power is supplied by a specific cause, and cuts off the power supply, thereby preventing the system from being overloaded.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a diagram illustrating a position control system according to an embodiment of the present invention.

Referring to FIG. 4, the position control system according to the present embodiment includes a controller 400, a rotating element 402, a sensing unit 404, and a reducer 406.

The position control system is a system for precisely controlling the positional movement of the variable position member, and for example, a phase shifter for varying the phase of a signal input to the radiation elements as described above with reference to FIGS. 1 to 3. The position variable member 112 included in the, i.e., the position movement of the arm bar is controlled. Of course, such a position control system may be used in other fields than the antenna field, but for convenience of description, it is assumed that the position control system controls the phase shifter of the antenna. In addition, reference will also be made to FIGS. 1 to 3 to explain the operation of the position control system.

1 to 4, the rotating element 402 is composed of a body portion 402A and a first rotating shaft 402B, and is preferably a low-cost DC motor. That is, the position control system of this embodiment controls the positional movement of the position variable member 112 using a low cost DC motor.

The first rotating shaft 402B is inserted into the body 402A, and rotates in response to the power when a predetermined power source, for example, a current, is applied from the controller 400. Here, the first rotation shaft 402B is inserted into the hole 308 of the inclination angle adjustment device 300 of FIG. 3 to rotate, and the force transmission member 306 of the inclination angle adjustment device 300 rotates the first rotation axis 402B. By transmitting the rotational force according to the second rotation member 202 of the phase shifter, the position variable member 112 is moved along the tracks 102 and 104 to the desired first position by the transmitted rotational force. As a result, the phase of the RF signal input through the input line 106 is changed, and thus the direction of the radiation pattern emitted by the radiation elements electrically connected to the lines 102, 104 and 108 is changed.

In addition, when the variable position member 112 is to be moved from the first position to the second position, the control unit 400 may adjust the position variable member (by the variation value corresponding to the difference between the second position and the first position). 112). Therefore, the control unit 400 provides the power supply corresponding to the difference between the second position and the first position to the rotating element 402 to rotate the first rotation shaft 402B.

As mentioned above, the variable position member 112 is not moved to a newly set position based on a specific reference point but is moved from a previous position to a new position. Therefore, if the movement to the previous position is not made correctly, the movement to the new position may not be made correctly. Therefore, in order to solve this problem, the position control system of the present embodiment moves the variable position member 112 by compensating for an error in the movement to the previous position when moving to the new position. Detailed description thereof will be described later with reference to the accompanying drawings.

The sensing unit 404 detects the rotational speed of the first rotational axis 402B of the rotating element 402, and as a result of the detection, the controller 400 controls a number of pulses proportional to the detected rotational speed, for example, a PWM pulse. Will output In detail, a second rotating shaft 408 is arranged between the sensing unit 404 and the rotating element 402, and the second rotating shaft 408 rotates in proportion to the rotational speed of the first rotating shaft 402B. For example, when the reduction gear 406 is set to 200: 1, when the first rotation shaft 402B rotates 10 times, the second rotation shaft 408 rotates 2000 times. In this case, the sensing unit 404 outputs pulses corresponding to the 2000 rotation to the controller 400. For example, when three PWM pulses are generated per revolution, 6000 PWM pulses are output to the controller 400. Therefore, the controller 400 may detect the number of rotations of the first rotation shaft 402B by identifying the number of PWM pulses. The sensing unit 404 that performs this operation may be referred to as an encoder.

The reducer 406 slows down the rotation of the first rotation shaft 402B. In the absence of such a speed reducer 406, the first rotation shaft 402B rotates by the same number of revolutions of the second rotation shaft 408. However, when the reducer 406 is present, the first rotation shaft 402B rotates by less than the rotation speed of the second rotation shaft 408.

The speed reducer 406 is not an essential component of the present invention, but is preferably included in the position control system in order to precisely control the position of the variable position member 112 described later.

The controller 400 generally controls the position control system. For example, the control unit 400 provides a predetermined power supply to the rotating element 402 to move the position of the variable position member 112, in particular, a power supply corresponding to the corresponding position change value by compensating for an error during the previous position movement. To the rotating element 402. As another example, when the first rotary shaft 402B does not rotate even though the power is supplied due to an unspecified cause, the controller 400 detects this through the sensing unit 404 and provides the power to the rotary motion element 402. To block. Detailed description thereof will be described later.

In short, the position control system of the present embodiment compensates for an error in the previous position movement when moving the position variable member 112 and moves it to a new position, so that the position variable member 112 can be accurately moved to a desired position. In particular, even if the rotating element 402 used in the present embodiment is a DC motor which is inexpensive or difficult to precisely control, the position control system can precisely perform position control through the above-mentioned method. That is, when using the position control system of the present embodiment it is possible to precisely control the position movement of the variable position member 112 while saving cost.

Hereinafter, a method of controlling the position of the variable position member 112 in the position control system will be described with reference to the accompanying drawings.

FIG. 5 is a flowchart illustrating a position control method according to an embodiment of the present invention, and FIG. 6 is a diagram illustrating a pulse change for explaining the position control method of FIG. 5. Here, it is assumed that the rotating element 402 is a DC motor, and the power is provided by a PWM method.

5 and 6, the controller 400 provides the rotating device 402 with increasing duty ratios before the normal power P5 is applied, that is, when the initial power is applied (S500). Here, the duty ratio means a ratio of the high level of one period of the pulse.

In general, in order to provide the power corresponding to the movement variation value of the variable position member 112 to the rotating element 402, a power larger than the power must be provided first, so that an overshooting phenomenon may occur. As a result, the controller 400 driving the rotating element 402 may be damaged. Accordingly, the position control system of the present embodiment does not provide a large power supply at once before providing the normal power supply P5 corresponding to the movement variation value of the position variable member 112, and a duty ratio smaller than P5 as shown in FIG. To provide power supplies P1 to P4 step by step. As a result, an overshooting phenomenon that may cause damage to the controller 400 does not occur, that is, damage to the controller 400 can be prevented.

In FIG. 6, four power supplies P1 to P4 having different duty ratios are provided to the rotating device 402 before the normal power supply P5 is input, but is not limited thereto. That is, the number and time of powers provided before the normal power supply P5 may be variously modified according to the intention of the administrator. For example, the duty ratios do not have to increase in stages, and the number of PWM pulses according to the duty ratios may be different. However, the duty ratio of the initially provided power supply should be smaller than the duty ratio of the normal power supply P5.

Subsequently, the controller 400 provides the power supply P5 corresponding to the movement variation value of the position variable member 112 to the rotating element 402 (S502). In this case, it is preferable that the first rotation shaft 402B is controlled so as not to rotate by the power sources P1 to P4 so that the variable position member 112 can move by a desired value. Of course, the first rotating shaft 402B may be rotated by one or more rotations due to the initially provided power supplies P1 to P4. In this case, the time for which the power supply P5 is provided will be set in consideration of the rotation. .

Subsequently, the first rotating shaft 402B rotates in accordance with the provision of the power source P5 (S504), and as a result, the variable position member 112 starts to move to a desired position.

Then, it is determined whether or not the time at which the power is cut off is reached (S506). Here, the power-off time point means a time at which the variable position member 112 cuts off the power supply to reach a desired position. However, since the first rotation shaft 402B may be further rotated by a predetermined number of times by the inertia force even when the supply of power is cut off, the time point for turning off the power is set in consideration of the rotation by the inertia force.

When the power-off time is not reached, that is, when the position variable member 112 is not moved to a desired position, the first rotation shaft 402B continuously rotates in accordance with the provision of the power.

On the other hand, when the power-off time is reached, the position control system of the present embodiment cuts off the power while gradually reducing the duty ratios of the PWM pulses P6, P7, P8 and P9 without abruptly shutting off the power. (S508 and S510). In general, when the power is suddenly cut off, the counter electromotive force is provided to the controller 400, and as a result, the control unit 400 may be damaged by the counter electromotive force. Therefore, the position control system of the present embodiment cuts off the power while gradually reducing the duty ratios in order to prevent damage to the control unit 400.

In FIG. 6, PWM pulses P6, P7, P8, and P9 having four different duty ratios are provided to the rotating device 402, but the present invention is not limited thereto and may be variously modified.

In short, the position control method of the present embodiment provides the rotating element 402 with varying duty ratios of the corresponding pulses when the power is initially applied or when the power is cut off.

7 is a flowchart illustrating a position control method according to another embodiment of the present invention.

Referring to FIG. 7, the controller 400 provides a power source corresponding to the movement variation value of the position variable member 112 to the rotating element 402 (S700).

As the power is supplied, the first rotation shaft 402B rotates, and as a result, the position changing member 112 starts to move (S702).

The sensing unit 404 detects the rotation speed of the first rotation shaft 402B and outputs pulses corresponding to the detected rotation speed to the control unit 400 (S704).

Subsequently, it is determined whether or not the number of output pulses is zero (S706). That is, it is determined whether there is no output pulse even though the power is supplied to the rotating element 402.

When the number of output pulses is not zero, that is, when the rotating element 402 operates normally, the position changing member 112 is continuously moved to a desired position in accordance with the rotation of the first rotating shaft 402B.

On the other hand, when the number of output pulses is 0, that is, when no pulse is output, it is determined whether the time for which the pulses are not output exceeds the preset time (S708).

When the time for which the pulses are not output does not exceed the preset time, it is determined that the rotating element 402 is operating normally.

On the other hand, when the time for which the pulses are not output exceeds the preset time, since the first rotation shaft 402B is not rotated even though the power is supplied, the controller 400 may be overloaded and damaged. Can be. Therefore, the control unit 400 cuts off the power supply to the rotating element 402 (S710).

In short, the position control method of the present embodiment prevents the overload of the controller 400, which may be caused by the rotational element 402 not rotating due to an unspecified reason even when power is supplied, through the above-mentioned control.

8 is a flowchart illustrating a position control method according to another embodiment of the present invention.

Referring to Fig. 8, the position variation value for moving the position variable member 112 to the first position and the number of pulses corresponding to the position variation value (hereinafter referred to as "first stop pulse") are set ( S800). Hereinafter, when the variable position member 112 is finally moved to the first position, it is assumed that the number of pulses output from the sensing unit 404 to the controller 400, that is, the first stop pulse is 3000.

Subsequently, the controller 400 provides power to the rotating element 402 corresponding to the set position variation value (first stop pulse) (S802). However, when the rotating element 402 is a DC motor, the control unit 400 provides the power Vcc of a constant size to the rotating element 402 by adjusting the time.

In accordance with the provision of the power source, the rotating element 402 is driven, that is, the first rotating shaft 402B rotates at a constant speed (S804).

The sensing unit 404 detects the rotation speed of the first rotation shaft 402B, and outputs pulses corresponding to the detected rotation speed to the control unit 400 (S806).

Subsequently, the controller 400 checks the number of pulses output from the sensing unit 404, and determines whether the number of output pulses is equal to or greater than the set first stop pulse (S808).

When the number of the output pulses is smaller than the first stop pulse, power is continuously supplied since the variable position member 112 has not yet been moved to the first position.

On the other hand, when the number of output pulses is greater than or equal to the first stop pulse, the controller 400 cuts off the supply of power (S810). In this case, since the first rotation shaft 402B is rotated a predetermined number of times by inertial force even when the power supply is cut off, pulses are further output from the sensing unit 404. Of course, the first stop pulse is set in consideration of this inertia force, but the set number of pulses and the actual number of pulses according to the operation may be different. However, since the position detecting system of the present embodiment includes the speed reducer 406, the rotation speed of the first rotating shaft 402B does not change greatly even if an error of the pulses occurs to some extent, so that the variable position member 112 is near the desired first position. Will be located at

However, the position control method of the present embodiment performs the following process to further reduce this error.

The control unit 400 compares the number of pulses actually output from the first stop pulse and the sensing unit 404 and according to the comparison result, the difference between the number of the first stop pulses and the pulses actually output, that is, a compensation pulse. Set (S812).

Subsequently, when the controller 400 intends to move the variable position member 112 from the first position to the second position, the controller 400 sets a position variation value corresponding to the difference between the second position and the first position (S814). ).

Subsequently, the controller 400 performs a calculation process of setting a second stop pulse in consideration of the compensation pulse (S816). For example, when the number of the first stop pulses is 3000 and the number of pulses actually output when moving to the first position is 3030, since the variable position member 112 is further moved by 30 pulses, the controller 400 may control the first stop pulse. The second stop pulse for moving to the second position is set by compensating for 30 pulses. For example, when there are 3600 stop pulses according to the change from the first position to the second position, the controller 400 compensates for a compensation pulse, that is, 30 pulses, and sets the second stop pulse to 3570. As a result, the variable position member 112 can accurately move to a desired position.

Thereafter, the controller 400 provides the power corresponding to the second stop pulse to the rotating element 402 to move the variable position member 112 from the first position to the second position (S818).

In short, the position control method of the present embodiment sets the position change value and the stop pulse in consideration of the compensation pulse at the time of the movement to the previous position at the time of the new position movement. Therefore, the position control method can precisely control the positional movement of the position variable member 112.

9 is a flowchart illustrating a position control method according to another embodiment of the present invention.

Referring to FIG. 9, the controller 400 supplies a power source according to a position change value to the rotating device 402 to drive the rotating device 402 (S900).

Subsequently, the sensing unit 404 detects the rotation speed of the first rotation shaft 402B and outputs pulses corresponding to the detected rotation speed to the control unit 400 (S902).

Subsequently, it is determined whether the number of pulses is zero, that is, whether the pulses are no longer output even though the power is supplied (S904).

When the pulses are output, step S900 is performed again because the rotating element 402 is operating normally.

On the other hand, if the pulses are not output for a predetermined time, the controller 400 notifies the manager that there is a problem in the system (S906).

Then, when the position of the variable position member 112 is to be moved, the corresponding phase variable value is determined and the above-described calculation process is performed (S908 and S910).

The embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention. Should be considered to be within the scope of the following claims.

1 and 2 illustrate front and rear views of a typical phase shifter.

3 is a view illustrating an inclination angle adjusting device connected to the phase shifter.

4 is a diagram illustrating a position control system according to an embodiment of the present invention.

5 is a flowchart illustrating a position control method according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating a pulse change for explaining the position control method of FIG. 5.

7 is a flowchart illustrating a position control method according to another embodiment of the present invention.

8 is a flowchart illustrating a position control method according to another embodiment of the present invention.

9 is a flowchart illustrating a position control method according to another embodiment of the present invention.

Claims (14)

A rotating element having a rotating shaft; And A control unit electrically connected to the rotating element and controlling a operation of the rotating element by applying a predetermined power to the rotating element, The rotary shaft is connected to an external element having a variable position member, the position of the variable position member is moved in response to the rotation of the rotary shaft, the control unit is the duty ratio (when the initial application of the power source or the power off) and a corresponding power supply to the rotating element while varying the duty rates. The position control system as claimed in claim 1, wherein the rotating element is a DC motor, and the external element is a phase shifter for varying the phase of the radiating elements through a change in position of the position varying member. The method of claim 1, wherein the position control system, A sensing unit for sensing the number of revolutions of the rotation axis and providing the PWM pulses corresponding to the detection result to the control unit, And when the PWM pulses are not provided to the controller for a preset time even though the power is provided to the rotating device, the control unit cuts off the power provided to the rotating device. The power supply of claim 3, wherein the power is cut off when the PWM pulses are not provided in the process of moving the variable position member to the first position. And setting the position variation value corresponding to the second position and the number of the corresponding PWM pulses in consideration of the number of PWM pulses according to the blocking. The method of claim 1, wherein the controller is configured to provide the power to the rotating element while increasing the duty ratios when the power is initially applied, and to supply the power to the rotating element while reducing the duty ratios when the power is turned off. Position control system, characterized in that. A rotating element connected to an external element having a position varying member and having a rotation axis; A control unit electrically connected to the rotating element and configured to control an operation of the rotating element by applying a predetermined power to the rotating element; And A sensing unit for sensing the number of revolutions of the rotation axis, providing the pulses corresponding to the detection result to the controller, The position of the variable position member is varied in response to the rotation of the rotation axis, and the control unit sets the number of first pulses corresponding to the change value to the first position when the position variable element is moved to the first position. And providing a corresponding first power source to the rotating device, wherein the sensing unit detects the number of rotations of the rotating shaft according to the provision of the first power source, and provides the second pulses according to the detection result to the controller. The number of third pulses corresponding to the change value to the second position by compensating for the difference of the number of the first pulses and the second pulses when moving the position variable element from the first position to the second position Position control system, characterized in that for setting. The method of claim 6, wherein the rotating element is a DC motor, the external element is a phase shifter for varying the phase of the radiation elements through the change of position of the position change member, the pulse is a PWM pulse. Position control system. The system of claim 6, wherein the system is And a reducer connected to the rotating element to reduce the rotation of the rotating shaft. Setting a number of first pulses for moving the repositionable member to the first position; Providing a power source corresponding to the change value to the first position to the rotating device to rotate the rotating shaft of the rotating device; Sensing the number of revolutions of the rotary shaft and outputting second pulses according to the detection result; And Setting third pulses for moving the variable position member from the first position to a second position, And the third pulses are compensated and set by a difference between the number of the first pulses and the second pulses. 10. The method of claim 9, wherein upon initial application of the power, the power is provided to the rotating element with increasing duty ratios. 10. The position control method according to claim 9, wherein when the power is cut off, the power is cut off gradually while reducing duty ratios. The method of claim 9, wherein the position control method, Determining whether the second pulse is not output for a preset time even though the power is provided to the rotating element; And And shutting off power provided to the rotating element when the second pulse is not output for the preset time. The position control method of claim 12, wherein the third pulses are set in consideration of the number of pulses according to the interruption of the power supply. 10. The member according to claim 9, wherein at least one of the first pulses, the second pulses, and the third pulses is a PWM pulse, and the position shifting member is used in a phase shifter for varying the phase of the radiation element of the antenna. Position control method characterized in that.

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