Method and device for driving DC brushless motor

Details Method and device for driving DC brushless motor Method and device for driving DC brushless motor

1996-10-07

1998-07-21

Ro, Bentsu

Electricity: motive power systems

Limitation of motor load, current, torque or force

318254, 318721, 318431, H02P 618

Patent

active

057839174

ABSTRACT:
In order to enable switching of a direct current brushless motor to sensorless operation in a very short time by a device of simple configuration, the application to a commutator section of external sync signals for accelerating the rotor is stopped upon passage of a fixed time after the start of application. The fixed time is set to one necessary and sufficient for the rotor to reach a speed sufficient for enabling sensorless operation. After the application is stopped, the commutator section is controlled to commutate drive current to the drive windings according to the rotor position by commutation control signals output by a position feedback drive signal generator using sensorless signals from a position detection circuit based on back electromotive force voltages generated in the drive windings.

REFERENCES:
patent: 4641066 (1987-02-01), Nagata et al.
patent: 5036264 (1991-07-01), Ueki
patent: 5223772 (1993-06-01), Carobolante
patent: 5225759 (1993-07-01), Endo et al.

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