DC brushless motor driving method and apparatus for accurately c

Details DC brushless motor driving method and apparatus for accurately c DC brushless motor driving method and apparatus for accurately c

1987-07-17

1988-05-31

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318138, H02K 2914, H02P 900

Patent

active

047483873

ABSTRACT:
A driving apparatus for controlling the drive of a direct current (DC) brushless motor including a stator having a plurality of armature coils which are provided on a generally circular stator yoke, and a rotatable rotor in which a disk-like magnet having N and S poles arranged alternately in a circumferential direction is provided on a generally circular rotor yoke to face the armature coils, includes a speed sensor for producing outputs responsive to a rotation speed of the rotor, a counter for counting the pulses which are produced by the speed sensors, a control circuit responsive to the speed sensors and counter for controlling the current applied to the armature coils in a predetermined sequence to thereby rotate the rotor, and a mechanism for cancelling a load acting on the rotor. The control circuit, at a start-up of the motor, switches the current applied to the armature coils to excite the armature coils in several different phases to thereby locate the rotor at a starting angular position, in the event when the rotor is located at the starting angular position, cancels a load acting on the rotor, at least before a last one of the phases is excited, subsequently controls rotation drive by counting output pulses of the speed sensor to determine an angular position of the rotor, and controls a rotation direction of the rotor on the basis of output pulses of the speed sensor and on a resulting count of the pulses. Also provided is a driving method for a brushless DC motor for effecting such a control.

REFERENCES:
patent: 3324369 (1967-06-01), Markakis
patent: 4631457 (1986-12-01), Tanuma et al.

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