Motor control device and motor control system

• US 9,450,532 B2
• Filed: 04/02/2014
• Issued: 09/20/2016
• Est. Priority Date: 04/02/2014
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Tanabe, Akira, Goto, Daisuke
• Primary Examiner(s): Leykin, Rita
• Application Number:
  US14/781,346
• Publication Number:
  US 20160142001A1
• Time in Patent Office: 902 Days
• Field of Search: 318/255, 318/490, 318/265, 318/268, 318/400.21, 318/706, 340/648, 340/635
• US Class Current: 1/1
• CPC Class Codes: H02P 29/00 Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors arrangements for starting electric motors H02P1/00; arrangements for stopping or slowing electric motors H02P3/00; control of motors that can be connected to two or more different electric power supplies H02P4/00; regulating or controlling the speed or torque of two or more electric motors H02P5/00; vector control H02P21/00
• CPC Class Codes: H02P 29/024 Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
• CPC Class Codes: H02P 29/0241 the fault being an overvoltage

Abstract

A motor control device includes: a control processing unit that controls driving of a motor based on a command signal input from a controller so as to command an operation of the motor and a detection signal which is a detection result of the operation of the motor; and an abnormality determining unit that detects an abnormality in the controller, the motor control device, and the motor based on the command signal, the detection signal, and a control signal generated in the motor control device and that determines a level of repeatability of the detected abnormality based on a predetermined criterion. The control processing unit transitions from a normal mode to a specific abnormality alarm mode when the abnormality determining unit determines that an specific abnormality having high repeatability has occurred.

Claims

1. A motor control device that is connected to a controller and a motor and that controls driving of the motor, the motor control device comprising:

a control processing unit to control the driving of the motor based on a command signal input from the controller so as to command an operation of the motor and a detection signal which is a detection result of the operation of the motor; and

an abnormality determining unit to detect an abnormality in the controller, the motor control device, and the motor based on the command signal, the detection signal, and a control signal generated in the motor control device and that determines a level of repeatability of the detected abnormality based on a predetermined criterion,

wherein, when a specific abnormality determined to have high repeatability according to the predetermined criterion has occurred, the control processing unit transitions from a normal mode in which the driving control of the motor is enabled to a specific abnormality alarm mode in which a control stop state in which the driving control of the motor is stopped is caused and in which releasing of the control stop state is disabled by a reset process, and wherein,

when a specific abnormality releasing process is performed on the motor control device, the control processing unit transitions from the specific abnormality alarm mode to an abnormality alarm mode in which the control stop state is caused and the releasing of the control stop state is enabled by the reset process.

2. The motor control device according to claim 1, wherein, when an abnormality other than the specific abnormality has occurred, the control processing unit transitions from the normal mode to the abnormality alarm mode.

3. The motor control device according to claim 1, wherein the specific abnormality releasing process is a process of inputting a mode transition command signal for commanding transition from the specific abnormality alarm mode to the abnormality alarm mode to the control processing unit.

4. The motor control device according to claim 3, further comprising a display unit that displays information in the motor control device,

Wherein, when the specific abnormality has occurred, the display unit transitions from a normal display mode in which normal display is performed to a specific abnormality alarm display mode in which occurrence information of the specific abnormality is displayed and restoration to the normal display mode is disabled by releasing the display of the occurrence information of the specific abnormality by the reset process.

5. The motor control device according to claim 4, wherein, when the specific abnormality releasing process is performed on the motor control device, the display unit transitions from the specific abnormality alarm display mode to an abnormality alarm display mode in which occurrence information of an abnormality other than the specific abnormality is displayed and restoration to the normal display mode is enabled by releasing the display of the occurrence information of the abnormality other than the specific abnormality by the reset process.

6. The motor control device according to claim 5, wherein, when the abnormality other than the specific abnormality has occurred, the display unit transitions from the normal display mode to the abnormality alarm display mode.

7. The motor control device according to claim 5, wherein the specific abnormality releasing process is a process of inputting a mode transition command signal for commanding transition from the specific abnormality alarm display mode to the abnormality alarm display mode to the display unit.

8. A motor control system comprising:

the motor control device according to claim 1;

a motor;

a detector that is connected to the motor and that generates a detection signal which is a detection result of an operation of the motor and inputs the detection signal to the motor control device; and

a controller to generate a control signal for commanding the operation of the motor and inputs the control signal to the motor control device.

9. A motor control device that is connected to a controller and a motor and that controls driving of the motor, the motor control device comprising:

a control processing unit to control the driving of the motor based on a command signal input from the controller so as to command an operation of the motor and a detection signal which is a detection result of the operation of the motor;

an abnormality determining unit to detect an abnormality in the controller, the motor control device, and the motor based on the command signal, the detection signal, and a control signal generated in the motor control device and that determines a level of repeatability of the detected abnormality based on a predetermined criterion; and

a display unit to display information inside the control processing unit;

wherein, when a specific abnormality determined to have high repeatability according to the predetermined criterion has occurred, the control processing unit transitions from a normal mode in which the driving control of the motor is enabled to a specific abnormality alarm mode in which a control stop state in which the driving control of the motor is stopped is caused and in which releasing of the control stop state is disabled by a reset process,

when the specific abnormality has occurred, the display unit transitions from a normal display mode in which normal display is performed to a specific abnormality alarm display mode in which occurrence information of the specific abnormality is displayed and restoration to the normal display mode is disabled by releasing the display of the occurrence information of the specific abnormality by the reset process, and

when the specific abnormality releasing process is performed on the motor control device, the display unit transitions from the specific abnormality alarm display mode to an abnormality alarm display mode in which occurrence information of an abnormality other than the specific abnormality is displayed and restoration to the normal display mode is enabled by releasing the display of the occurrence information of the abnormality other than the specific abnormality by the reset process.

10. The motor control device according to claim 9, wherein, when the abnormality other than the specific abnormality has occurred, the display unit transitions from the normal display mode to the abnormality alarm display mode.

11. The motor control device according to claim 9, wherein the specific abnormality releasing process is a process of inputting a mode transition command signal for commanding transition from the specific abnormality alarm display mode to the abnormality alarm display mode to the display unit.

12. A motor control system comprising:

the motor control device according to claim 9;

a motor;

a detector that is connected to the motor and that generates a detection signal which is a detection result of an operation of the motor and inputs the detection signal to the motor control device; and

a controller to generate a control signal for commanding the operation of the motor and inputs the control signal to the motor control device.