Sensorless, brushless DC motor start-up circuit using intermitte

Details Sensorless, brushless DC motor start-up circuit using intermitte Sensorless, brushless DC motor start-up circuit using intermitte

1996-02-28

1998-03-10

Wysocki, Jonathan

Electricity: motive power systems

Switched reluctance motor commutation control

318439, H02P 100

Patent

active

057265437

ABSTRACT:
A start-up circuit for a sensorless, brushless DC motor modifies a conventional start-up circuit to include an intermittently-accelerated-rate clock generator for supplying a clock signal intermittently accelerated in rate to a shift register that is connected as a ring counter for selectively generating three-phase commutation signals during start-up and six-phase phase commutation signals during running. The intermittently-accelerated-rate clock generator facilitates the start-up circuit increasing the magnitude of a back electromotive force by adjusting the rate of a starting clock during start-up of the motor, so as to be capable of both a normal start-up with a normal-rate clock signal and an accelerating start-up with an accelerated-rate clock signal. This permits a stable and rapid start-up without need for a microprocessor or complicated circuitry.

REFERENCES:
patent: 5298838 (1994-03-01), Peters et al.
patent: 5350988 (1994-09-01), Le
patent: 5382889 (1995-01-01), Peters et al.
patent: 5448141 (1995-09-01), Kelley et al.
patent: 5481167 (1996-01-01), Rohrbaugh et al.

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