Vibration control system

Abstract

To provide a vibration control system capable of appropriately controlling an actuator without giving adverse effects to a vibration control function in a device on which the actuator is mounted.SOLUTION: A vibration control system includes: an actuator for giving force for suppressing vibration of a unit to be controlled, which is a target on which vibration control is performed, to the unit to be controlled; a motor for driving the actuator; an acceleration sensor for detecting acceleration of the unit to be controlled; a drive unit for giving a driving signal to the motor; and a controller for giving a command to the drive unit on the basis of a detection result of the acceleration sensor. When the command is not input and the motor is operating, the drive unit turns off input of the driving signal to the motor.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vibration damping system. [Background technology]

[0002] Active vibration control actuators are sometimes installed in passenger vehicles and other equipment. In such equipment, linear actuators are operated to cancel vibrations below a certain frequency (for example, below 20 Hz). In addition, for high-frequency vibrations that are difficult for humans to sense, the motor current command is set to 0, putting the device into a reverse operation state. In Patent Document 1, the actuator is locked when in the reverse operation state. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-105506 Summary of the Invention [Problem to be solved by the invention]

[0004] If the actuator is locked during reverse operation, as in Patent Document 1, the actuator behaves like a rigid body and becomes a path for transmitting vibrations from the seismic source. This can undesirably increase vibrations in the area where people sit. Furthermore, even if the motor driving the actuator is turned off, if the motor remains electrically connected, the energy of reverse operation is consumed by capacitors and regenerative resistors on the circuit. This acts as a brake on the device, causing the same adverse effects as when the motor is locked. Furthermore, if reverse operation occurs while the motor is excited, the back electromotive force from the motor becomes a disturbance in the control system, causing a current different from the command to flow. In this case, the actuator will operate unintentionally, adversely affecting the vibration control function.

[0005] The present disclosure has been made in consideration of the above, and its purpose is to provide a vibration control system that can appropriately control an actuator in a device in which the actuator is installed without adversely affecting the vibration control function. [Means for solving the problem]

[0006] A vibration control system according to one aspect of the present disclosure includes an actuator that applies a force to a damped part, which is the object of vibration control, to suppress vibration of the damped part, a motor that drives the actuator, an acceleration sensor that detects the acceleration of the damped part, a drive unit that applies a drive signal to the motor, and a controller that issues a command to the drive unit based on the detection result of the acceleration sensor, wherein the drive unit turns off the input of the drive signal to the motor when the command is not input and the motor is operating.

[0007] It is preferable that the drive unit includes a switch that turns on and off the input of the drive signal to the motor, and that the drive unit turns off the switch to electrically disconnect from the motor when the command is not input and the motor is operating.

[0008] It is preferable that the power supply further includes an inverter circuit that outputs the drive signal, and the switch is provided on the output side of the inverter circuit.

[0009] It is preferable that the power supply further includes an inverter circuit that outputs the drive signal, and the switch is provided on the input side of the inverter circuit.

[0010] It is preferable that the motor further includes a rectifier circuit that rectifies the input three-phase AC voltage, and the inverter circuit receives the rectified output of the rectifier circuit as an input and provides the output of the inverter circuit as the drive signal to the motor.

[0011] It is preferable that the inverter circuit receives a DC voltage as an input and provides an output of the inverter circuit to the motor as the drive signal.

[0012] The switch is preferably turned on and off by a signal input from an external device.

[0013] It is preferable that the motor starts operating after a predetermined time has elapsed after the switch is turned from an off state to an on state.

[0014] It is preferable that the motor further includes an angle detection unit that detects the rotation angle of the motor, and that the drive unit turns off the input of the drive signal to the motor when the command is not input and the rotation of the motor is detected by the angle detection unit.

[0015] It is preferable that the motor further includes a current sensor connected to the wiring of the drive signal to the motor, and the drive unit turns off the input of the drive signal to the motor when the command is not input and rotation of the motor is detected by the current sensor.

[0016] It is preferable that the motor further includes a voltage sensor connected to the wiring of the drive signal to the motor, and the drive unit turns off the input of the drive signal to the motor when the command is not input and rotation of the motor is detected by the voltage sensor. [Effects of the Invention]

[0017] According to the present disclosure, in a device in which an actuator is installed, the actuator can be appropriately controlled without adversely affecting the vibration damping function. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a diagram illustrating a configuration of a vibration control system according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a flowchart illustrating the operation of the vibration control system shown in FIG. [Figure 3] FIG. 3 is a diagram showing the main parts of a first modified example of the vibration damping system of the present disclosure. [Figure 4] FIG. 4 is a diagram showing the main parts of a second modified example of the vibration damping system of the present disclosure. [Figure 5] FIG. 5 is a diagram showing the main parts of a third modified example of the vibration damping system of the present disclosure. [Figure 6] FIG. 6 is a diagram showing the main parts of a fourth modified example of the vibration damping system of the present disclosure. [Figure 7] FIG. 7 is a diagram showing the main parts of a fifth modified example of the vibration damping system of the present disclosure. [Figure 8] FIG. 8 is a diagram showing an example of an operation when a switch that has been opened is returned to a closed state. [Figure 9] FIG. 9 is a flowchart illustrating the operation in the case of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the following description of the embodiments or modifications, components that are the same as or equivalent to those in other embodiments or modifications will be given the same reference numerals, and their description will be simplified or omitted. The present disclosure is not limited to each embodiment or modification. Furthermore, the components of each embodiment or modification include those that are easily replaceable by a person skilled in the art, or those that are substantially the same. The configurations described below can be combined as appropriate. Omissions, substitutions, or modifications of the configurations can be made within the scope of the invention.

[0020] (composition) Fig. 1 is a diagram showing the configuration of a vibration control system according to an embodiment of the present disclosure. In Fig. 1, a vibration control system 1 according to a first embodiment of the present disclosure includes a controller 100, a motor driver 3, a motor 4, and an actuator 6. The vibration control system 1 controls the vibration of a part 7 to be damped.

[0021] (vibration-damped parts, etc.) The part to be damped 7 is the object to be controlled by the vibration damping system 1. The part to be damped 7 is, for example, a vehicle in which a person P, a passenger, rides. Springs 71a and 71b are provided at the bottom of the part to be damped 7. One end of spring 71a is connected to the bottom of one end of the part to be damped 7. The other end of spring 71a is fixed to fixed part 72a. One end of spring 71b is connected to the bottom of one end of the part to be damped 7. The other end of spring 71b is fixed to fixed part 72b.

[0022] Fixed shafts 73 and 74 are provided below the vibration-damped portion 7. One end of the fixed shaft 73 is connected to the housing of the actuator 6, and the other end of the fixed shaft 73 is connected to the fixed portion 72b. As a result, the actuator 6 is fixed to the fixed portion 72b via the fixed shaft 73. The fixed shaft 74 is connected to the output shaft 64, which will be described later.

[0023] The vibration-controlled portion 7 is also provided with an accelerometer 70. The accelerometer 70 measures acceleration due to an external force applied to the vibration-controlled portion 7 in the direction of arrow Y1, for example, and outputs a measurement signal 701. The controller 100 outputs a rotation command 101 to rotate the motor 4.

[0024] (Motor driver) The motor driver 3 includes a rectifier circuit 31, an inverter circuit 32, a motor control unit 33, a capacitor 34, and a switch SW. The motor driver 3 receives a three-phase AC voltage 200 consisting of R, S, and T phases as an input power source. The motor driver 3 outputs a three-phase AC voltage 201 consisting of U, V, and W phases. The three-phase AC voltage 201 is a drive signal that drives the motor 4. The motor driver 3 is a drive unit that provides the drive signal to the motor 4.

[0025] The rectifier circuit 31 has, for example, a diode bridge circuit. The rectifier circuit 31 performs full-wave or half-wave rectification on the three-phase AC voltage 200 and outputs the result. The capacitor 34 is a smoothing capacitor. The capacitor 34 is, for example, an electrolytic capacitor. The capacitor 34 is charged and discharged by the output of the rectifier circuit 31. By charging and discharging the capacitor 34 by the output of the rectifier circuit 31, a DC voltage or a pulsating voltage similar to a DC voltage can be obtained.

[0026] The inverter circuit 32 has switching elements such as transistors, etc. The inverter circuit 32 turns the switching elements on and off in response to a PWM (Pulse Width Modulation) signal 330 from the motor control unit 33, and outputs a three-phase AC voltage.

[0027] The switch SW is opened (off) or closed (on) based on the circuit disconnection signal 331. When the switch SW is open, it turns off the input of the drive signal to the motor 4. When the switch SW is closed, it turns on the input of the drive signal to the motor 4. The switch SW may be, for example, a relay or a magnetic switch, and the type does not matter. The switch SW may also be a transistor such as a field effect transistor (FET) that turns off or on based on the circuit disconnection signal 331. In this example, the switch SW opens or closes all three phases. However, a switch that opens or closes any two phases instead of all three phases may also be used.

[0028] The motor control unit 33 outputs a PWM signal 330 when a rotation command 101 is input. The motor control unit 33 outputs a circuit disconnection signal 331 based on the rotation command 101 and angle information 401, which will be described later.

[0029] (Motor) The motor 4 is, for example, a three-phase AC motor. The motor 4 includes windings that generate a magnetic field, and rotates a rotating shaft by a three-phase AC voltage 201 from the motor driver 3. In this example, an angle detector 40 for detecting the rotation angle of the rotating shaft is provided inside the motor 4. The angle detector 40 corresponds to the angle detection unit of the present disclosure. The rotation of the motor 4 can be detected by the angle detector 40.

[0030] (actuator) The actuator 6 is a linear actuator, and includes a reducer 50 , a connecting mechanism 61 , a nut 62 , a linear mechanism 63 , and an output shaft 64 .

[0031] In this example, the reducer 50 has three gears 51, 52, and 53. The rotation shaft of the gear 51 is connected to the rotation shaft of the motor 4. The gears 51 and 52 mesh together to transmit rotational force. The gears 52 and 53 mesh together to transmit rotational force. The rotation shaft of the gear 53 is connected to the linear motion mechanism 63. The rotational force of the motor 4 is reduced by the reducer 50 and rotates the linear motion mechanism 63. The reducer 50 may have two or four or more gears. If there is no need to reduce the speed, the reducer 50 does not need to be provided.

[0032] The connecting mechanism 61 connects the nut 62 and the linear motion mechanism 63. The nut 62 has an internal thread on its inner surface, and the linear motion mechanism 63 has an external thread on its outer surface. The nut 62 and the linear motion mechanism 63 have a ball screw structure, and the threads of the linear motion mechanism 63 and the nut 62 mesh with each other. As the linear motion mechanism 63 rotates, the nut 62 can move in the direction of arrow Y2 along the longitudinal direction of the linear motion mechanism 63. As the nut 62 moves in the direction of arrow Y2, the output shaft 64 moves in the direction of arrow Y2. As a result, the output shaft 64 moves in the direction of arrow Y1 to suppress an applied external force or in the opposite direction, depending on the rotation direction of the linear motion mechanism 63, thereby suppressing vibration of the vibration-damped part 7 via the fixed shaft 74.

[0033] (operation) The accelerometer 70 measures the acceleration of the vibration-controlled portion 7 and outputs a measurement signal 701. The measurement signal 701 is input to the controller 100. The controller 100 sends a rotation command 101 to the motor driver 3 to perform vibration control. The motor driver 3 generates a PWM signal 330 in the motor control unit 33 based on the rotation command 101 from the controller 100 and motor angle information 401 detected by the angle detector 40. The PWM signal 330 is input to the inverter circuit 32.

[0034] The three-phase AC voltage 200 supplied to the motor driver 3 is converted to a DC voltage or the like by a rectifier circuit and a smoothing electrolytic capacitor, and is applied to the inverter circuit 32. The applied voltage and PWM signal 330 cause the inverter circuit 32 to pass a three-phase AC current to the motor 4 according to the rotation command 101. This causes the motor 4 to rotate.

[0035] The rotational motion of the motor 4 is converted into linear motion by the actuator 6 and output by the output shaft 64. At this time, the motor control unit 33 compares the rotation command 101 with the angle information 401 of the motor 4. A state in which the motor 4 is rotating even though the rotation command 101 has not been input is determined to be reverse operation, and the switch SW between the inverter circuit 32 and the motor 4 is opened (turned off).

[0036] When the switch SW is opened, the motor 4 and the motor driver 3 are electrically disconnected. As a result, no force is generated that would hinder reverse operation such as braking due to an output disturbance to the current control of the inverter circuit 32 or a regenerative resistor. Note that when the input of the rotation command 101 resumes, the switch SW is immediately closed to control the motor 4.

[0037] The above operation will be further explained with reference to Fig. 2. Fig. 2 is a flowchart explaining the operation of the vibration control system shown in Fig. 1. In Fig. 2, first, it is determined whether or not a rotation command has been input (step S101). If no rotation command has been input in step S101 (No in step S101), it is determined whether or not the motor is rotating (step S102).

[0038] In step S102, if the motor is rotating (Yes in step S102), the switch is opened to turn it off (step S103). Next, it is determined whether or not to end control of the actuator (step S104). If control of the actuator is to be ended (Yes in step S104), the process ends.

[0039] On the other hand, in step S104, if the control of the actuator is not to be ended (No in step S104), the process returns to step S101 and the operation continues.

[0040] If a rotation command is input in step S101 (Yes in step S101), the switch is closed and turned on (step S105). Next, the process proceeds to step S104, where it is determined whether or not to end control of the actuator.

[0041] In step S102, if the motor is not rotating (No in step S102), the process proceeds to step S104, where it is determined whether or not to end the control of the actuator.

[0042] In other words, if the motor 4 is rotating without the rotation command 101 being input, it is determined to be in a reverse operation state, and in the reverse operation state, the path that forms the closed circuit between the windings of the motor 4 and the inverter circuit 32 is cut off. In this way, it is possible to realize an actuator 6 that does not prevent reverse operation. Through the above operations, it is possible to determine whether the motor 4 is in a reverse operation and to appropriately control the actuator 6 without adversely affecting the vibration damping function.

[0043] (Variation) A modification of the vibration control system described with reference to FIGS. 1 and 2 will now be described.

[0044] (First Modification) Fig. 3 is a diagram showing the main parts of a first modified example of the vibration control system of the present disclosure. In Fig. 3, the vibration control system of the first modified example differs from the vibration control system 1 shown in Fig. 1 in the configuration of the motor driver 3a. The configuration of other parts is the same as that of the vibration control system 1 shown in Fig. 1. The internal configuration of the actuator 6 is not shown.

[0045] 3, the motor driver 3a includes a switch SWa instead of the switch SW in FIG. 1. The switch SWa is provided between the rectifier circuit 31 and the inverter circuit 32. The switch SWa is connected in series to the wiring between the rectifier circuit 31 and the inverter circuit 32. The switch SWa is opened (i.e., turned off) or closed (i.e., turned on) by a circuit disconnection signal 331 from the motor control unit 33.

[0046] When the rotation command 101 is not input and the rotation of the motor 4 is detected, the switch SWa is opened by the circuit disconnection signal 331, thereby allowing the actuator to be appropriately controlled without adversely affecting the vibration control function.

[0047] (Second Modification) Fig. 4 is a diagram showing the main parts of a second modified example of the vibration control system of the present disclosure. In Fig. 4, the vibration control system of the second modified example differs from the vibration control system 1 shown in Fig. 1 in the configuration of the motor driver 3b. The configuration of other parts is the same as that of the vibration control system 1 shown in Fig. 1.

[0048] 4, the motor driver 3b has a configuration in which a current sensor 35 is added to the wiring between the switch SW and the motor 4 in FIG. 1. The current sensor 35 is connected to the wiring for the drive signal to the motor 4. Also, unlike the configuration in FIG. 1, it does not matter whether the motor 4 is equipped with an angle detector 40 or not.

[0049] Motor control unit 33 outputs circuit disconnection signal 331 based on rotation command 101 and current value 350 detected by current sensor 35. Motor control unit 33 outputs circuit disconnection signal 331 when rotation command 101 is not input and current value 350 detected by current sensor 35 is other than 0 [A] (i.e., when rotation of motor 4 is detected). By outputting circuit disconnection signal 331 from motor control unit 33 and opening switch SWa, the actuator can be appropriately controlled without adversely affecting the vibration damping function.

[0050] (Third Modification) Fig. 5 is a diagram showing the main parts of a third modified example of the vibration control system of the present disclosure. In Fig. 5, the vibration control system of the third modified example differs from the vibration control system 1 shown in Fig. 1 in the configuration of the motor driver 3c. The configuration of other parts is the same as that of the vibration control system 1 shown in Fig. 1.

[0051] 5, the motor driver 3c has a configuration in which a voltage sensor 36 is added to the wiring between the switch SW and the motor 4 in FIG. 1. The voltage sensor 36 is connected to the wiring for the drive signal to the motor 4. Also, unlike the configuration in FIG. 1, it does not matter whether the motor 4 is equipped with an angle detector 40 or not.

[0052] Motor control unit 33 outputs circuit disconnection signal 331 based on rotation command 101 and line voltage value 360 detected by voltage sensor 36. Motor control unit 33 outputs circuit disconnection signal 331 when rotation command 101 is not input and line voltage value 360 detected by voltage sensor 36 is other than 0 [V] (i.e., when rotation of motor 4 is detected). By outputting circuit disconnection signal 331 from motor control unit 33 and opening switch SW, the actuator can be appropriately controlled without adversely affecting the vibration damping function.

[0053] (Fourth Modification) Fig. 6 is a diagram showing the main parts of a fourth modified example of the vibration control system of the present disclosure. In Fig. 6, the vibration control system of the fourth modified example differs from the vibration control system 1 shown in Fig. 1 in the configuration of the motor driver 3d. The configuration of other parts is the same as that of the vibration control system 1 shown in Fig. 1.

[0054] In Fig. 6, a motor driver 3d receives a direct current power supply DC as an input and does not have a rectifier circuit. That is, whereas the vibration control system 1 shown in Fig. 1 receives a three-phase AC voltage 200 as an input, the fourth modified example receives a direct current power supply DC as an input. The direct current power supply DC has a grounded side N (Neutral) and an ungrounded side L (Live). The switch SW may be provided on the output side of the inverter circuit 32 as shown in Fig. 6, or on the input side of the inverter circuit 32.

[0055] The motor control unit 33 outputs a circuit disconnection signal 331 based on the rotation command 101 and the angle information 401. When the rotation command 101 is not input and the angle information 401 detected by the angle detector 40 is other than "0°", the motor control unit 33 outputs the circuit disconnection signal 331. By outputting the circuit disconnection signal 331 from the motor control unit 33 and opening the switch SW, the actuator 6 can be appropriately controlled without adversely affecting the vibration damping function.

[0056] (Fifth Modification) Fig. 7 is a diagram showing the main parts of a fifth modified example of the vibration control system of the present disclosure. In Fig. 7, the vibration control system of the fifth modified example differs from the vibration control system 1 shown in Fig. 1 in the configuration of the motor driver 3e. The configuration of other parts is the same as that of the vibration control system 1 shown in Fig. 1.

[0057] 7, the motor driver 3e sets the switch SW to an open state (i.e., an OFF state) or a closed state (i.e., an ON state) in response to a circuit disconnection signal 102 input from an external device. The circuit disconnection signal 102 is output, for example, from a controller 100 (see FIG. 1), which is a higher-level device, and input to the motor driver 3e. In this case, the controller 100, which is a higher-level device, determines whether reverse operation is occurring. Note that the circuit disconnection signal 102 is not limited to being output from the controller 100, but may also be output from another device and input to the motor driver 3e.

[0058] Regardless of whether or not a rotation command 101 is input, by opening the switch SW in response to a circuit disconnection signal 102 input from an external device, the actuator can be appropriately controlled without adversely affecting the vibration suppression function.

[0059] (Example of operation when returning the switch to the closed state) Fig. 8 is a diagram showing an example of operation when a switch that has been opened is returned to a closed state. In Fig. 8, the horizontal axis represents the passage of time. Fig. 8 shows changes in the rotation command 101, angle information 401, switch state, and PWM signal 330.

[0060] In FIG. 8, since the rotation command 101 is not input from time t0 to time t1, the motor 4 is stopped and the rotation angle indicated by the angle information 401 is "0°." When the rotation command 101 is input at time t1, the motor 4 starts to rotate and enters a normal operating state. The rotation angle indicated by the angle information 401 gradually increases. The angle information 401 changes within a range from 0° to 360° as the motor 4 rotates.

[0061] At time t2, when the rotation command 101 is no longer input and it is determined that the reverse operation state is occurring, the switch is opened, which, as described above, does not prevent the reverse operation of the actuator 6.

[0062] Thereafter, when a rotation command 101 is input at time t3, the switch is returned to the closed state. Thus, if the inverter circuit 32 is in a state where a large current flows when the circuit is restored after being disconnected, a sudden current flow may occur when the switch is closed, potentially causing a spark or other problem. To protect the vibration control system from such a situation, the input of the PWM signal 330 begins at time t4, a predetermined time T after time t3. In other words, if the rotation command 101 is input while the switch is in the open state, the motor control unit 33 inputs the PWM signal 330 to the inverter circuit 32 with a time delay after the switch is closed. This prevents a sudden current flow by starting operation of the motor 4 after the predetermined time T has elapsed after the switch is switched from the off state to the on state.

[0063] FIG. 9 is a flowchart illustrating the operation in the case of FIG. 8. The operation in FIG. 9 differs from the operation in FIG. 2 in that step S106 is inserted after step S105. That is, after the switch is closed and turned on (step S105), the PWM signal 330 is input after a predetermined time has elapsed (step S106). The other operations are the same as those described with reference to FIG. 2. In this way, the motor control unit 33 has the function of providing a time lag between the time the switch is closed and the time the PWM signal 330 is input. This function makes it possible to prevent a sudden current flow.

[0064] With respect to the claims, the present disclosure may take the following forms. (1) an actuator that applies a force to a vibration-controlled part, which is an object of vibration control, to the vibration-controlled part to suppress vibration of the vibration-controlled part; a motor that drives the actuator; an acceleration sensor that detects the acceleration of the vibration-damped portion; a drive unit that supplies a drive signal to the motor; a controller that issues a command to the drive unit based on a detection result of the acceleration sensor; Including, The drive unit is a vibration control system that turns off the input of the drive signal to the motor when the command is not input and the motor is operating. (2) the drive unit includes a switch that turns on and off input of the drive signal to the motor, When the command is not input and the motor is operating, the drive unit turns off the switch to electrically disconnect the motor. (1) The vibration control system. (3) further including an inverter circuit that outputs the drive signal; The switch is provided on the output side of the inverter circuit. (2) The vibration control system according to (2). (4) further including an inverter circuit that outputs the drive signal; The switch is provided on the input side of the inverter circuit. (2) The vibration control system according to (2). (5) further including a rectifier circuit that rectifies the input three-phase AC voltage; the inverter circuit receives the rectified output of the rectifier circuit as an input; The output of the inverter circuit is applied to the motor as the drive signal. The vibration control system according to (3) or (4). (6) The inverter circuit receives a DC voltage as an input, The output of the inverter circuit is applied to the motor as the drive signal. The vibration control system according to (3) or (4). (7) The vibration control system according to (2), wherein the switch is turned on and off by a signal input from an external device. (8) The vibration control system according to any one of (2) to (7), wherein the motor starts operating after a predetermined time has elapsed after the switch is turned from an off state to an on state. (9) further including an angle detection unit that detects a rotation angle of the motor; The drive unit turns off the input of the drive signal to the motor when the command is not input and the rotation of the motor is detected by the angle detection unit. A vibration control system according to any one of (1) to (8). (10) a current sensor connected to a wiring of the drive signal to the motor; The drive unit turns off the input of the drive signal to the motor when the command is not input and the rotation of the motor is detected by the current sensor. A vibration control system according to any one of (1) to (8). (11) a voltage sensor connected to a wiring of the drive signal to the motor; The drive unit turns off the input of the drive signal to the motor when the command is not input and the rotation of the motor is detected by the voltage sensor. A vibration control system according to any one of (1) to (8). [Explanation of symbols]

[0065] 1. Vibration control system 3, 3a, 3b, 3c, 3d, 3e Motor Drivers 4 motors 6 Actuators 7 Damped part 31 Rectifier circuit 32 Inverter circuit 33 Motor control unit 34 Capacitor 35 Current Sensor 36 Voltage sensor 40 Angle detector 50 reducer 61 Connection mechanism 62 Nut 63 Linear motion mechanism 64 Output shaft 70 accelerometer 71a, 71b springs 72a, 72b fixed part 73, 74 Fixed axis 100 Controllers 200, 201 Three-phase AC voltage P person SW, SWa switch

Claims

1. an actuator that applies a force to a vibration-controlled part, which is an object of vibration control, to the vibration-controlled part to suppress vibration of the vibration-controlled part; a motor that drives the actuator; an acceleration sensor that detects the acceleration of the vibration-damped portion; a drive unit that supplies a drive signal to the motor; a controller that issues a command to the drive unit based on a detection result of the acceleration sensor; Including, The drive unit is a vibration control system that turns off the input of the drive signal to the motor when the command is not input and the motor is operating.

2. the drive unit includes a switch that turns on and off input of the drive signal to the motor, When the command is not input and the motor is operating, the drive unit turns off the switch to electrically disconnect the motor. The vibration control system of claim 1 .

3. further including an inverter circuit that outputs the drive signal; The switch is provided on the output side of the inverter circuit. The vibration control system of claim 2 .

4. further including an inverter circuit that outputs the drive signal; The switch is provided on the input side of the inverter circuit. The vibration control system of claim 2 .

5. further including a rectifier circuit that rectifies the input three-phase AC voltage; the inverter circuit receives the rectified output of the rectifier circuit as an input; The output of the inverter circuit is applied to the motor as the drive signal. The vibration control system according to claim 3 or 4.

6. The inverter circuit receives a DC voltage as an input, The output of the inverter circuit is applied to the motor as the drive signal. The vibration control system according to claim 3 or 4.

7. 3. The vibration control system according to claim 2, wherein the switch is turned on and off by a signal input from an external device.

8. 4. The vibration damping system according to claim 2, wherein the motor starts operating after a predetermined time has elapsed after the switch is turned on from the off state.

9. further including an angle detection unit that detects a rotation angle of the motor; The drive unit turns off the input of the drive signal to the motor when the command is not input and the rotation of the motor is detected by the angle detection unit. The vibration damping system according to any one of claims 1 to 3.

10. a current sensor connected to a wiring of the drive signal to the motor; The drive unit turns off the input of the drive signal to the motor when the command is not input and the rotation of the motor is detected by the current sensor. The vibration damping system according to any one of claims 1 to 3.

11. a voltage sensor connected to a wiring of the drive signal to the motor; The drive unit turns off the input of the drive signal to the motor when the command is not input and the rotation of the motor is detected by the voltage sensor. The vibration damping system according to any one of claims 1 to 3.

Images