Method and apparatus for controlling motors of different types

• US 20080084171A1
• Filed: 01/04/2007
• Published: 04/10/2008
• Est. Priority Date: 10/06/2006
• Status: Active Grant

• Current Assignee: Performance Motion Devices, Inc.
• Original Assignee: Performance Motion Devices, Inc.
• Inventors: Li, Peng, Leehey, Jonathan Robert, Gort, James Richard, Lewin, Emanuel Gustav
• Granted Patent: US 7,719,214 B2
• Time in Patent Office: Days
• US Class Current: 318/34
• CPC Class Codes: G05B 19/042 using digital processors G05B19/05 takes precedence
• CPC Class Codes: G05B 19/414 Structure of the control system, e.g. common controller or multiprocessor systems, interface to servo, programmable interface controller
• CPC Class Codes: H02P 5/46 for speed regulation of two or more dynamo-electric motors in relation to one another

Abstract

In order to reduce the time and expense of designing and operating a motor control system with multiple motors of different types, a motor control system is provided with motor control modules that monitor and record status information and update settings in a uniform manner regardless of the motor type under control. Each motor control module includes an output power stage and a motor control unit connected to each other. The status information includes status information about the output power stage or a current control loop connected to the output power stage. The settings include conditions monitored by each motor control module and corresponding actions taken by each motor control module based on the conditions. A host processor connected to the multiple motor control modules may request the common status information and send messages to update common settings of the motor control modules.

Claims

1. A motor control module, comprising:

an output power stage configured for a particular motor type;

a motor control unit coupled to the output power stage, the motor control unit configured to monitor status information about the motor control module; and

status registers coupled to the motor control unit, the status registers having a format independent of motor type, the motor control unit configured to update the status information in the status registers.

2. The motor control module according to claim 1, wherein the status information includes status information about the output power stage.

3. The motor control module according to claim 2, wherein the status information about the output power stage includes a voltage input to the output power stage, temperature of the output power stage, and current output by the output power stage.

4. The motor control module according to claim 1, wherein the status information includes status information about a current control loop coupled to the output power stage.

5. The motor control module according to claim 4, wherein the status information about the current control loop includes a commanded current, measured current, difference between the commanded and measured currents, sum of an integrator of the current control loop, overall contribution of the integrator, and output command for the current control loop.

6. The motor control module according to claim 1, wherein the status registers include an event status register, activity status register, output power stage status register, and signal status register.

7. The motor control module according to claim 1, wherein the motor types include a DC brush motor, brushless DC motor, step motor, AC induction motor, and variable reluctance motor.

8. The motor control module according to claim 1, wherein the motor control unit further includes a processing unit coupled to the output power stage and the status registers, the processing unit configured to update the status registers.

9. The motor control module according to claim 1, wherein the status registers include an event status register, the motor control unit configured to clear at least one bit in the event status register based on a message from a host processor in communication with the motor control module.

10. The motor control module according to claim 1, wherein the motor control module further includes a communications unit coupled to the motor control unit, the communications unit configured to report the status information to a motor control data bus.

11. The motor control module according to claim 10, wherein the communications unit includes at least one of a serial, parallel, Controller Area Network (CAN) and Ethernet interface.

12. A motor control module, comprising:

an output power stage configured for a particular motor type; and

a motor control unit coupled to the output power stage, the motor control unit configured to update settings of the motor control module, the settings being independent of motor type.

13. The motor control module according to claim 12, wherein the settings include conditions and corresponding actions.

14. The motor control module according to claim 13, wherein the conditions include current foldback.

15. The motor control module according to claim 13, wherein the conditions include a level or threshold breakpoint trigger condition and the actions include breakpoint actions.

16. The motor control module according to claim 13, wherein the actions include abrupt stop with position error clear, disable trajectory generator, disable position loop, disable current loop, and disable motor output.

17. The motor control module according to claim 12, wherein the settings include current control loop parameters.

18. The motor control module according to claim 17, wherein the current control loop parameters include proportional gain, integral gain, and integration limit.

19. A method of controlling a motor of a particular motor type, the method comprising:

monitoring status information about a motor control module for a motor of a particular motor type, the status information being in a format independent of motor type; and

updating the status information about the motor control module in status registers.

20. The method according to claim 19, wherein the status information includes status information about an output power stage of the motor control module.

21. The method according to claim 20, wherein the status information about the output power stage includes a voltage input to the output power stage, temperature of the output power stage, and current output by the output power stage.

22. The method according to claim 19, wherein the status information includes status information about a current control loop of the motor control module.

23. The method according to claim 22, wherein the status information about the current control loop includes a commanded current, measured current, difference between the commanded and measured currents, sum of an integrator of the current control loop, overall contribution of the integrator, and output command for the current control loop.

24. The method according to claim 19, wherein the status registers include an event status register, an activity status register, an output power stage status register, and a signal status register.

25. The method according to claim 19, wherein the motor types include a DC brush motor, brushless DC motor, step motor, AC induction motor, and variable reluctance motor.

26. The method according to claim 19, wherein updating the status information includes updating the status information at regular intervals or in response changes in the status information.

27. A method of controlling a motor of a particular motor type, the method comprising:

receiving a message to update settings of a motor control module for a particular motor type, the format of the settings being independent of motor type; and

updating the settings of the motor control module based on the message.

28. The method according to claim 27, wherein the settings include conditions and corresponding actions.

29. The method according to claim 28, wherein the conditions include current foldback.

30. The method according to claim 28, wherein the conditions include a level or threshold breakpoint trigger condition and the actions include breakpoint actions.

31. The method according to claim 28, wherein the actions include abrupt stop with position error clear, disable trajectory generator, disable position loop, disable current loop, and disable motor output.

32. The method according to claim 27, wherein the settings include current control loop parameters.

33. The method according to claim 32, wherein the current control loop parameters include proportional gain, integral gain, and integration limit.

34. A motor control system, comprising:

a motor control data bus for carrying motor information; and

plural motor control modules for different motor types coupled to the motor control data bus, each motor control module including;

an output power stage for a particular motor type;

a motor control unit coupled to the output power stage, the motor control unit including status registers configured to store status information about the motor control module, the status information being in common among the plural motor control modules.

35. The motor control system according to claim 34, further comprising a host controller coupled to the plural motor control modules via the motor control data bus, the host controller configured to retrieve the common status information by sending a message to the plural motor control modules.

36. A motor control system, comprising:

a motor control data bus for carrying motor information; and

plural motor control modules for different motor types coupled to the motor control data bus, each motor control module including;

an output power stage for a particular motor type;

a motor control unit coupled to the output power stage, the motor control unit configured to update settings of the motor control module in common among the plural motor control modules based on a message from the motor control data bus.