Motor torque compensation of an induction electric motor by adjusting a slip command during periods of supposed change in motor temperature
Abstract
The present invention maintains constant torque in an inverter driven AC induction motor during variations in rotor temperature. It is known that the torque output of a given AC induction motor is dependent upon rotor temperature. At rotor temperatures higher than the nominal operating condition the rotor impedance increases, reducing the rotor current and motor torque. In a similar fashion, the rotor impedance is reduced resulting in increased rotor current and motor torque when the rotor temperature is lower than the nominal operating condition. The present invention monitors the bus current from the DC supply to the inverter and adjusts the slip frequency of the inverter drive to maintain a constant motor torque. This adjustment is based upon whether predetermined conditions implying increased rotor temperature or decreased rotor temperature exist for longer that a predetermined interval of time.
- Inventors:
-
- Brighton, MI
- Livonia, MI
- Issue Date:
- Research Org.:
- EATON CORP
- OSTI Identifier:
- 868163
- Patent Number(s):
- 5086264
- Assignee:
- Eaton Corporation (Cleveland, OH)
- Patent Classifications (CPCs):
-
B - PERFORMING OPERATIONS B60 - VEHICLES IN GENERAL B60L - PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02T - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- DOE Contract Number:
- AC07-84NV10366
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- motor; torque; compensation; induction; electric; adjusting; slip; command; periods; supposed; change; temperature; maintains; constant; inverter; driven; variations; rotor; output; dependent; temperatures; nominal; operating; condition; impedance; increases; reducing; current; similar; fashion; reduced; resulting; increased; monitors; bus; dc; supply; adjusts; frequency; drive; maintain; adjustment; based; predetermined; conditions; implying; decreased; exist; interval; time; slip frequency; induction motor; electric motor; operating condition; motor torque; torque output; dc supply; predetermined interval; maintains constant; constant torque; /318/
Citation Formats
Kelledes, William L, and John, Don K. Motor torque compensation of an induction electric motor by adjusting a slip command during periods of supposed change in motor temperature. United States: N. p., 1992.
Web.
Kelledes, William L, & John, Don K. Motor torque compensation of an induction electric motor by adjusting a slip command during periods of supposed change in motor temperature. United States.
Kelledes, William L, and John, Don K. Wed .
"Motor torque compensation of an induction electric motor by adjusting a slip command during periods of supposed change in motor temperature". United States. https://www.osti.gov/servlets/purl/868163.
@article{osti_868163,
title = {Motor torque compensation of an induction electric motor by adjusting a slip command during periods of supposed change in motor temperature},
author = {Kelledes, William L and John, Don K},
abstractNote = {The present invention maintains constant torque in an inverter driven AC induction motor during variations in rotor temperature. It is known that the torque output of a given AC induction motor is dependent upon rotor temperature. At rotor temperatures higher than the nominal operating condition the rotor impedance increases, reducing the rotor current and motor torque. In a similar fashion, the rotor impedance is reduced resulting in increased rotor current and motor torque when the rotor temperature is lower than the nominal operating condition. The present invention monitors the bus current from the DC supply to the inverter and adjusts the slip frequency of the inverter drive to maintain a constant motor torque. This adjustment is based upon whether predetermined conditions implying increased rotor temperature or decreased rotor temperature exist for longer that a predetermined interval of time.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1992},
month = {Wed Jan 01 00:00:00 EST 1992}
}