Brushless direct current motor starting and operating apparatus

Details Brushless direct current motor starting and operating apparatus Brushless direct current motor starting and operating apparatus

1990-10-05

1991-05-21

Smith, Jr., David

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

318254, 318778, H02P 602

Patent

active

050178458

ABSTRACT:
A starting and operating apparatus and method for a sensorless, brushless direct current motor is disclosed. During start-up, the excitation to the motor is turned off while the slope of the differential back electromotive force of the floating phases is sampled. This indicates when the proper rotation and torque of the motor is obtained. After starting the motor, the apparatus samples the slope of the back electromotive force of the floating coils and finds a zero or predetermined slope condition which has been found to be near the optimum switching point for commutation from one phase to the next. A masking circuit is included to prevent an unwanted commutation immediately after commutating to the next phase.

REFERENCES:
patent: 3909688 (1975-09-01), Blaschke
patent: 4631459 (1986-12-01), Fujioka et al.
patent: 4743815 (1988-05-01), Gee et al.
patent: 4746850 (1988-05-01), Abbondanti
patent: 4912378 (1990-03-01), Vukosavic

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