发明授权
US4748387A DC brushless motor driving method and apparatus for accurately controlling starting position of rotor 失效
用于精确控制转子起动位置的直流无刷电机驱动方法和装置

DC brushless motor driving method and apparatus for accurately
controlling starting position of rotor
摘要:
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.
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