Brushless DC motor

Details Brushless DC motor Brushless DC motor

1991-06-28

1992-09-01

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318138, H02P 602

Patent

active

051442094

ABSTRACT:
A brushless DC motor which does not have a position sensor for detecting a rotational point of a rotor, instead of using a position sensor, detects the zero-crossing points of counter electromotive forces induced in the stator windings of the motor to obtain a pulse signal train. From the pulse signal train thus obtained and a slant waveform signal generated in response to the pulse signal train, a position signal with a trapezoidal waveform is formed. An electric current signal with a trapezoidal waveform is supplied to the stator windings of the motor in response to the position signal thus formed for effecting an electric current switching of the stator windings smoothly, resulting in realizing a motor drive which is less in vibration and noise even when rotating at a high speed.

REFERENCES:
patent: 4694210 (1987-09-01), Elliott et al.
patent: 4712050 (1987-12-01), Nagasawa et al.
patent: 4835448 (1989-05-01), Dishner et al.
patent: 4912378 (1990-03-01), Vukosavic
patent: 4928043 (1990-05-01), Plunkett
patent: 4970445 (1990-11-01), Kimura et al.
patent: 4978895 (1990-12-01), Schwarz
patent: 4983894 (1991-01-01), Oku et al.

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