Motor drive circuit having a soft switching circuit and a push-p

Details Motor drive circuit having a soft switching circuit and a push-p Motor drive circuit having a soft switching circuit and a push-p

1993-11-23

1997-08-26

Wysocki, Jonathan

Electricity: motive power systems

Limitation of motor load, current, torque or force

318254, H02P 700

Patent

active

056613822

ABSTRACT:
A circuit to drive a brushless motor which consumes less power because it uses pulse width modulation. The invention has at least two loops; one loop to control the switching of transistors in a push-pull configuration drives current in the different coils of the motor when those transistors connected to ground are driven in a linear, rather than a saturated, mode. This loop also incorporates a soft switching waveform shaping circuit which slowly switches the phase current so that the electromagnetic noise of the motor does not enter the magnetic head on the disk. The other loop actually controls the speed of the motor based on the linear mode of the transistors.

REFERENCES:
patent: 4473781 (1984-09-01), Nielsen
patent: 4484114 (1984-11-01), Ebbs
patent: 4510422 (1985-04-01), Ogura
patent: 4527102 (1985-07-01), Gotou
patent: 4546294 (1985-10-01), Ban et al.
patent: 4651067 (1987-03-01), Ito et al.
patent: 4740734 (1988-04-01), Takeuchi et al.

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