Apparatus for driving brushless motor

Details Apparatus for driving brushless motor Apparatus for driving brushless motor

1985-02-21

1987-03-17

Roskoski, Bernard

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, H02P 602

Patent

active

046510672

ABSTRACT:
An apparatus for driving a brushless motor, in which a ripple appearing in the rotation torque of the motor is cancelled by driving the motor with a signal current whose phase is opposite to that of and which has a waveform symmetrical with that of the torque ripple waveform, so that the motor can rotate accurately without any speed variation. In order to obtain such a signal current waveform, counter-electromotive forces induced in the stator coils of the motor are detected, and the level of the signal indicative of the detected counter-electromotive forces is controlled depending on the load and rotation speed of the motor to provide a control signal for controlling the motor drive current.

REFERENCES:
patent: 3584280 (1971-06-01), Inagaki
patent: 3757185 (1973-09-01), Brunner et al.
patent: 3891904 (1975-06-01), Pollmeier
patent: 3916272 (1975-10-01), Grunleitner
patent: 3942083 (1976-03-01), Takahashi et al.
patent: 4051420 (1977-09-01), Tanikoshi
patent: 4442386 (1984-04-01), Uchida et al.
patent: 4535276 (1985-08-01), Yokobori

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