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

H - Electricity

02

P

318/94

H02P 6/00 (2006.01) H02P 6/08 (2006.01) H02P 23/00 (2006.01)

Patent

CA 1181478

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.

396546

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