Method and apparatus for driving a sensorless DC motor having a

Details Method and apparatus for driving a sensorless DC motor having a Method and apparatus for driving a sensorless DC motor having a

1998-06-08

1999-11-23

Ip, Paul

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, H02P 100, H02P 700, H02P 118

Patent

active

059906421

ABSTRACT:
A method and an apparatus for driving a sensorless DC motor having a bridge-type inductance detecting circuit. The method of driving a sensorless DC motor including a rotor having Y-winding phase coils and a plurality of magnetic poles comprises the steps of applying an alternating current voltage signal to bridge circuits coupled to the phase coils, respectively, inputting an output voltage signal of each bridge circuit as an inductance detecting signal of each phase coil, amplifying the inputted inductance detecting signal of each phase coil, comparing a value of the amplified inductance detecting signal of each phase coil to each other, and determining an initial position of the rotor for rotating the rotor, the phase coils except for a phase coil having a maximum inductance detecting signal being magnetized at the initial position. By the method, the initial position of the rotor can be precisely detected even when the rotor is rotated at a low speed or in a stop state, so the motor is reliably driven.

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