Apparatus and method for limiting the speed of an electric motor

Details Apparatus and method for limiting the speed of an electric motor Apparatus and method for limiting the speed of an electric motor

1997-04-21

1998-05-26

Sircus, Brian

Electricity: motive power systems

Synchronous motor systems

Field winding circuits

318721, 318369, 388803, 180171, H02P 146

Patent

active

057571619

ABSTRACT:
A motor control apparatus for detecting motor overspeed in an electric car to prevent destruction of the motor and assure the safety of the vehicle. Torque control is applied when the motor speed is less than a specified rotational velocity. When the motor is detected to be operating at greater than the specified rotational velocity, i.e., when motor overspeed is detected, the motor is controlled to coast or regenerate to lower the motor speed to less than the specified rotational velocity, after which normal control is resumed, thereby preventing collision due to sudden braking and preventing damage to the motor.

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"Flux-Weakening Regime Operation of an Interior Permanent-Magnet Synchronous Motor Drive", vol. 4, Jul.-Aug. 1987, IEEE Transactions on Industry Applications, by Thomas M. Jahns.

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