Motor torque compensation of an induction electric motor by adju

Details Motor torque compensation of an induction electric motor by adju Motor torque compensation of an induction electric motor by adju

1990-06-22

1992-02-04

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318802, 318806, 318811, H02P 541

Patent

active

050862642

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.

REFERENCES:
patent: 4063112 (1977-12-01), Dumbeck
patent: 4160940 (1979-07-01), Wolf
patent: 4194129 (1980-03-01), Dumbeck
patent: 4527214 (1985-07-01), Hattori et al.
patent: 4547826 (1985-10-01), Premerlani
patent: 4629035 (1986-12-01), Tanahashi et la.
patent: 4672288 (1987-06-01), Abbondanti
patent: 4689543 (1987-08-01), Huckey
patent: 4779708 (1988-10-01), Sasao et al.
patent: 4914386 (1990-04-01), Zocholl

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