Automatic phase adjuster for a brushless motor driving signal

Details Automatic phase adjuster for a brushless motor driving signal Automatic phase adjuster for a brushless motor driving signal

1997-02-19

1998-11-17

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318621, 318721, H02P 600

Patent

active

058381236

ABSTRACT:
An automatic phase adjuster for the driver of a brushless motor is provided. This automatic phase adjuster can output a driving signal adaptively with a suitable phase-lead or phase-lag angle so as to allow the motor to be operated with the optimal output characteristics, including optimal output torque, optimal output efficiency, and optimal output power at all speeds. The automatic phase adjuster is configured variously in accordance with the particular type of the motor on which the automatic phase adjuster is used. For single-direction motors operated at a fixed speed, the automatic phase adjuster includes a phase-lead filter coupled to a Hall sensor which detects the motor speed. For single-direction motors operated at various speeds, the automatic phase adjuster includes a phase-lead filter, a phase-lag filter, a multiplexer, and a Hall sensor. The multiplexer selects either the phase-lead filter or the phase-lag filter to process the motor speed signal. For dual-direction motors operated at various speeds, the automatic phase adjuster includes a phase-lead filter, a phase-lag filter, a multiplexer, and a Hall sensor. The multiplexer selects either the phase-lead filter or the phase-lag filter depending on the direction and acceleration/deceleration condition of the motor. This allows the motor to be always driven with optimal performance.

REFERENCES:
patent: 3916272 (1975-10-01), Grunleitner et al.
patent: 3999108 (1976-12-01), Tanikoshi
patent: 4008425 (1977-02-01), Dickey
patent: 4651068 (1987-03-01), Meshkat-Razavi
patent: 5223772 (1993-06-01), Carobolante
patent: 5367237 (1994-11-01), Ring et al.
Krause et al., Electromechanical Motion Devices, Section 7.6 Analysis of Steady-State Operation, pp. 283-297, McGraw-Hill, Inc. (1989).

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