Control apparatus and method for motor to prevent motor drive ci

Details Control apparatus and method for motor to prevent motor drive ci Control apparatus and method for motor to prevent motor drive ci

1997-11-25

1999-07-13

Shoop, Jr., William M.

Electricity: motive power systems

Constant motor current, load and/or torque control

318433, H02P 700

Patent

active

059231351

ABSTRACT:
Described are control apparatus and method for a motor applicable to an electric vehicle in which a motor drive circuit having a plurality of arms, each arm including same series-connected semiconductor switching devices for controllably switching a voltage applied thereacross from a DC power supply so as to apply an AC power to the motor, is associated with the motor, switching operations of the respective semiconductor switching devices so as to regulate a driving of the motor according to a torque instruction inputted thereto are controlled, a temperature having a correlation to a junction temperature of at least one semiconductor switching device is detected, the detected temperature is read, the junction temperature of the semiconductor switching device from the detected temperature is estimated, a determination is made whether the estimated junction temperature is above an allowable limit of the junction temperature, and an output of the motor drive circuit to the motor is adjusted so that the estimated junction temperature is equal to or below the allowable limit on the basis of a result of a determination that the estimated junction temperature is above the allowable limit.

REFERENCES:
patent: 5444351 (1995-08-01), Yamamura et al.
patent: 5535115 (1996-07-01), Kishi et al.
patent: 5541494 (1996-07-01), Sannomiya et al.

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