Torque controller in an electric motor

Details Torque controller in an electric motor Torque controller in an electric motor

2011-03-01

2011-03-01

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Constant motor current, load and/or torque control

C318S434000

Reexamination Certificate

active

07898198

ABSTRACT:
The torque of a motor operated by an inverter circuit is controlled to allow maximum torque in the motor when the motor is stalled or at low rotation speeds. Control is accomplished by providing a switching frequency to the motor at a first switching frequency, detecting a rotation speed of the motor, and switching the current to the motor to a second switching frequency when the rotation speed of the motor drops to a predetermined slow rotation speed. The second switching frequency is less than the first switching frequency.

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patent: 6023140 (2000-02-01), Joo et al.
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