Claims
- 1. A method for monitoring performance characteristics of an in-service motor, comprising the steps of:
- remotely measuring operating characteristics of said in-service motor;
- applying said operating characteristics to an equivalent circuit for electrical motors;
- evaluating said equivalent circuit by using the resistance of the stator to calculate the power loss from the stator to determine at least one performance characteristic of said in-service motor; and
- confirming the determined at least one performance characteristic of said in-service motor.
- 2. The method according to claim 1, wherein said motor is an induction motor.
- 3. The method according to claim 1, wherein said equivalent circuit includes at least one equivalent circuit parameter selected from the group consisting of stator resistance, stator leakage inductance, rotor resistance, rotor leakage inductance, core resistance, magnetizing inductance, and slip ratio.
- 4. The method according to claim 1, wherein said operating characteristics are current and voltage.
- 5. The method according to claim 1, wherein one of said performance characteristics is the rotor speed of said in-service motor.
- 6. The method according to claim 1, wherein one of said performance characteristics is the power output of said in-service motor.
- 7. The method according to claim 1, wherein one of said performance characteristics is the efficiency of said in-service motor.
- 8. The method according to claim 1, wherein one of said performance characteristics is the torque of said in-service motor.
- 9. The method according to claim 1, wherein one of said performance characteristics is the power factor of said in-service motor.
- 10. An apparatus for monitoring motor performance characteristics of an in-service motor comprising:
- means for remotely measuring operating characteristics of said in-service motor;
- means for applying said operating characteristics to an ac equivalent circuit for electrical motors;
- means for evaluating said ac equivalent circuit by using the resistance of the stator to calculate the power loss from the stator to determine at least one performance characteristic of said in-service motor; and
- means for confirming the determined at least one performance characteristic of said in-service motor.
- 11. The apparatus according to claim 10, wherein said in-service motor is an induction motor.
- 12. The apparatus according to claim 11, wherein said operating characteristics are current and voltage.
- 13. The apparatus according to claim 10, including means for determining at least one equivalent circuit parameter of said in-service motor selected from the group consisting of stator resistance, stator leakage inductance, rotor resistance, rotor leakage inductance, core resistance, magnetizing inductance, and slip ratio; and
- further including means for applying said at least one equivalent circuit parameter to said equivalent circuit.
- 14. The apparatus according to claim 10, wherein one of said performance characteristics is the slip of said in-service motor.
- 15. The apparatus according to claim 10, wherein one of said performance characteristics is the power output of said in-service motor.
- 16. The apparatus according to claim 10, wherein one of said performance characteristics is the efficiency of said in-service motor.
- 17. The apparatus according to claim 10, wherein one of said performance characteristics is the torque of said in-service motor.
- 18. The apparatus according to claim 10, wherein one of said performance characteristics is the power factor of said in-service motor.
Parent Case Info
This is a continuation of application Ser. No. 08/155,259, filed Nov. 22, 1993, abandoned.
US Referenced Citations (20)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2 044 940 A |
Oct 1980 |
GBX |
Non-Patent Literature Citations (2)
Entry |
Vincent Del Toro, Entitled: Electromechanical Devices for Energy Conversion and Control Systems, pub. Prentice-Hall, Inc. Chapter 4, pp. 170-178. |
Application Data, MG Jan. 1987, Part 14, pp. 6-7, Entitled: Effects of Unbalanced Voltages on the Performance of Polyphase Induction Motors, MG1-14.35. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
155259 |
Nov 1993 |
|