Induction motor module and motor incorporating same

• US 20040019439A1
• Filed: 07/23/2002
• Published: 01/29/2004
• Est. Priority Date: 07/23/2002
• Status: Active Grant

• Current Assignee: Baldor Electric Company (ABB Limited)
• Original Assignee: Reliance Electric Technologies LLC (ABB Limited)
• Inventors: El-Ibiary, Yehia
• Granted Patent: US 6,862,538 B2
• Time in Patent Office: Days
• US Class Current: 702/57
• CPC Class Codes: G01R 31/34 Testing dynamo-electric machines
• CPC Class Codes: H02P 23/14 Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
• CPC Class Codes: H02P 29/66 Controlling or determining the temperature of the rotor

Abstract

A system and method for establishing estimated values of a plurality of electrical parameters of a motor. The plurality of electrical parameters may be established from stator resistance data and electrical input data obtained with no load on the motor. The plurality of electrical parameters may also be established from stator resistance data, electrical input data, and motor speed data obtained at at least two load conditions of the motor. The plurality of electrical parameters may comprise rotor resistance. The system and method may also be used to estimate a plurality of operating parameters of the motor based on the estimated values of a plurality of electrical parameters of the motor. The plurality of operating parameters of a motor may comprise rotor temperature, motor torque, and motor efficiency.

Claims

1. An electric motor system, comprising:

an electronic device that is operable to establish estimated values of a plurality of electrical parameters of a motor based on electrical input data and stator resistance data.

2. The electric motor system as recited in claim 1, wherein the electronic device is operable to establish an estimated value of an operating parameter of the motor based on the estimated values of electrical parameters of the motor.

3. The system as recited in claim 2, wherein the operating parameter is motor torque.

4. The system as recited in claim 2, wherein the operating parameter is motor efficiency.

5. The system as recited in claim 1, wherein the operating parameter is rotor temperature.

6. The system as recited in claim 1, wherein the operating parameter is electrical current induced in the rotor.

7. The system as recited in claim 1, wherein the plurality of electrical parameters of the motor comprises electrical resistance of the rotor during operation of the motor.

8. The system as recited in claim 1, wherein the plurality of electrical parameters of the motor comprises stator inductance.

9. The system as recited in claim 1, wherein the electrical input data comprises input voltage, input current, and input frequency.

10. The system as recited in claim 1, wherein the electronic device establishes the estimated values of a plurality of electrical parameters of a motor based on electrical input data and motor speed data obtained at at least two different load conditions of the motor.

11. The system as recited in claim 1, wherein the electronic device establishes the estimated values of a plurality of electrical parameters of a motor based on electrical input data obtained with no load on the motor.

12. The system as recited in claim 2, comprising a visual display operable to provide a visual indication of at least one of the estimated values of a plurality of electrical parameters and the estimated valve of an operating parameter.

13. The system as recited in claim 1, comprising:

a communication module operable to enable data to be manually provided to the system.

14. The system as recited in claim 1, wherein the electronic device is coupleable to an external communications network.

15. An instrumentation device, comprising:

a processing system that is operable to establish estimated values of a plurality of electrical characteristics of a motor and at least one operating parameter of the motor based on the estimated values of a plurality of electrical characteristics of the motor.

16. The device as recited in claim 15, wherein the processing system is operable to establish the estimated values of a plurality of electrical characteristics of a motor based on stator resistance data and electrical input data obtained with no load on the motor.

17. The device as recited in claim 15, wherein the processing system is operable to establish the estimated values of a plurality of electrical characteristics of a motor based on stator resistance data, and electrical input data and rotor speed data obtained at a plurality of load conditions of the motor.

18. The device as recited in claim 15, comprising an input module to enable data to be provided to the system.

19. The device as recited in claim 15, wherein the plurality of motor electrical characteristics comprises rotor reactance.

20. The device as recited in claim 15, wherein the plurality of motor electrical characteristics comprises core loss resistance.

21. The device as recited in claim 15, wherein the plurality of motor electrical characteristics comprises is rotor resistance.

22. The device as recited in claim 15, wherein the plurality of motor electrical characteristics comprises is magnetizing reactance.

23. The device as recited in claim 15, wherein the at least one operating parameter comprises rotor torque.

24. The device as recited in claim 15, wherein the at least one operating parameter comprises motor efficiency.

25. The device as recited in claim 15, wherein the at least one operating parameter comprises rotor temperature.

26. A method of operating a motor having a rotor and a stator, comprising:

providing an instrumentation system with stator resistance data for the motor;

providing the instrumentation system with electrical input data obtained during operation of the motor with no load on the motor; and

operating the instrumentation system to establish estimated values of a plurality of electrical parameters of the motor based on the stator resistance data and the electrical input data.

27. The method as recited in claim 26, further comprising:

providing the instrumentation system with electrical input data obtained during operation of the motor with a load on the motor;

providing the instrumentation system with shaft speed data obtained during operation of the motor with the load on the motor; and

operating the instrumentation system to establish an estimated value of at least one motor operating parameter based on the estimated values of a plurality of electrical parameters, the shaft speed data, and the electrical input data obtained during operation of the motor with the load on the motor.

28. The method as recited in claim 26, wherein providing the instrumentation system with electrical input data comprises obtaining the data at a location electrically coupled to the motor and compensating for the resistance of wiring between the location and the motor.

29. A method of operating a motor having a rotor and a stator, comprising:

providing an instrumentation system with stator resistance data for the motor;

providing the instrumentation system with rotor speed data and electrical input data obtained during operation of the motor with a first load on the motor;

providing the instrumentation system with rotor speed data and electrical input data obtained during operation of the motor with a second load on the motor; and

operating the instrumentation system to establish estimated values of a plurality of electrical parameters of the motor based on the stator resistance data and the rotor speed data and electrical input data obtained during operation of the motor with the first and second loads on the motor.

30. The method as recited in claim 29, further comprising:

operating the motor at a given load on the motor;

providing the instrumentation system with electrical input data obtained during operation of the motor with given load on the motor;

providing to the instrumentation system with shaft speed data obtained during operation of the motor with the given load on the motor; and

operating the instrumentation system to establish an estimated value of at least one motor operating parameter based on the estimated values of a plurality of electrical parameters, the shaft speed data, and the electrical input data obtained during operation of the motor with the given load on the motor.

31. The method as recited in claim 29, wherein providing the instrumentation system with electrical input data comprises obtaining the data at a location electrically coupled to the motor and compensating for the resistance of wiring between the location and the motor.

32. A system for estimating an operating parameter of an electric motor, comprising:

means for establishing an estimated value of at least one electrical parameter of the motor;

means for providing rotor speed data to an electronic system;

means for providing electrical input data to the electronic system;

means for establishing an estimated value of at least one electrical parameter of the motor based on rotor speed data and electrical input data; and

means for establishing an estimated value of at least one motor operating parameter based on rotor speed data, electrical input data, and the estimated value of at least one electrical parameter of the motor.

33. A program stored in a tangible medium, wherein the program is operable to enable a processing system to establish an estimated value of at least one electrical parameter of a motor based on stator resistance data and electrical input data.

34. The program as recited in claim 33, wherein the program is operable to establish the estimated value of at least one electrical parameter of a motor based on electrical input data obtained with no load on the motor.

35. The program as recited in claim 33, wherein the program is operable to establish the estimated value of at least one electrical parameter of a motor based on electrical input data and rotor speed data obtained at at least two load conditions of the motor.