Digital speed control for a brushless DC motor

Details Digital speed control for a brushless DC motor Digital speed control for a brushless DC motor

1981-03-27

1983-08-23

Truhe, J. V.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318341, H02P 506

Patent

active

044006543

ABSTRACT:
A digital control system is provided to regulate the speed of a brushless DC motor via pulse-width modulation. Digital counters are used to measure the difference between the time for a motor revolution and a reference time. This time difference is in turn used to control the time until the application of power during a fixed period. A motor speed decrease increases the difference in time between a motor revolution and the reference time. This decreases the power pulse delay time and results in an increased power-on time to bring the motor back up to nominal speed.

REFERENCES:
patent: 3313994 (1967-04-01), Haydon
patent: 3953776 (1976-04-01), Wolf
patent: 4160939 (1979-07-01), Damouth et al.
patent: 4280082 (1981-07-01), Acharya et al.
patent: 4298832 (1981-11-01), Acker et al.

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