Spindle motor control system

Details Spindle motor control system Spindle motor control system

1980-10-15

1983-02-01

Truhe, J. V.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318317, 318342, 318388, H02P 102

Patent

active

043718183

ABSTRACT:
A control system for a brushless direct current motor providing linear closed loop speed control when the motor is operating near its desired speed and providing pulse width modulation closed loop speed control when the motor is not operating near its desired speed. A current sensing feedback loop is provided to drive the transistor linearly controlling the electronic commutation of the motor into pulse width modulation when the current through the motor exceeds a predetermined value. An inductor may be coupled in series with control transistor and positive feedback may be supplied to the current sensor.

REFERENCES:
patent: 3660746 (1972-05-01), Milek
patent: 3766458 (1973-10-01), Nishimura et al.
patent: 3921047 (1975-11-01), Carter et al.
patent: 3965405 (1976-06-01), Romano
patent: 4152632 (1979-05-01), Peterson
patent: 4227127 (1980-10-01), Fukaya et al.
patent: 4232257 (1980-11-01), Harshberger, Jr.

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