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Title: 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. 4 figs.

Inventors:
;
Publication Date:
OSTI Identifier:
7207604
Patent Number(s):
US 5086264; A
Application Number:
PPN: US 7-542266
Assignee:
Eaton Corp., Cleveland, OH (United States)
Resource Type:
Patent
Resource Relation:
Patent File Date: 22 Jun 1990
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ELECTRIC MOTORS; CLOSED-LOOP CONTROL; TORQUE; ROTORS; TEMPERATURE DEPENDENCE; CONTROL; ENGINES; MOTORS; 320303* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Equipment & Processes

Citation Formats

Kelledes, W L, and John, D 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, W L, & John, D 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, W L, and John, D K. 1992. "Motor torque compensation of an induction electric motor by adjusting a slip command during periods of supposed change in motor temperature". United States.
@article{osti_7207604,
title = {Motor torque compensation of an induction electric motor by adjusting a slip command during periods of supposed change in motor temperature},
author = {Kelledes, W L and John, D 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. 4 figs.},
doi = {},
url = {https://www.osti.gov/biblio/7207604}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Feb 04 00:00:00 EST 1992},
month = {Tue Feb 04 00:00:00 EST 1992}
}