Method for driving a brushless DC electric motor

Details Method for driving a brushless DC electric motor Method for driving a brushless DC electric motor

1996-03-27

1998-03-24

Wysocki, Jonathan

Electricity: motive power systems

Switched reluctance motor commutation control

318439, H02P 700

Patent

active

057316708

ABSTRACT:
A circuit and method for driving a brushless sensorless direct current (DC) motor (2), using the steps of: at the beginning of each phase, driving the motor in PWM mode; monitoring the duration (Tc) between successive zero-crossings of the back electromotive force (BEMF), and accordingly predicting the next zero-crossing; and before the next predicted zero-crossing, switching to a linear driving mode only until the actual zero-crossing of the BEMF.

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Application No. 08/764,782, filed Dec. 12, 1996, entitled "BEMF Crossing Detection in PWM Mode Operation for Sensorless Motor Control Application".
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