Commutation delay generator for a multiphase brushless DC motor

Details Commutation delay generator for a multiphase brushless DC motor Commutation delay generator for a multiphase brushless DC motor

1996-02-02

1998-06-16

Cabeca, John W.

Electricity: motive power systems

Limitation of motor load, current, torque or force

318254, 388809, H02P 614

Patent

active

057676437

ABSTRACT:
A commutation control circuit provides a substantially periodic series of commutation signals to a conventional motor sequencer. The control circuit includes a frequency-to-current converter that receives the series of commutation signals and outputs a current that has a magnitude proportional to the average period of the series of commutation signals. The proportional current is then used to charge and/or discharge a known capacitance after a back-EMF sensor determines the appropriate starting time of a delay period. The capacitance and the proportional current are selected such that the proportional current charges the capacitance to a selected voltage level to trigger a commutation signal after the appropriate delay period.

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