Starting circuit and starting method for a brushless motor

Details Starting circuit and starting method for a brushless motor Starting circuit and starting method for a brushless motor

1996-12-18

1998-09-15

Ip, Paul

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

318138, 318254, 318607, 318608, G05B 1928, H02P 123

Patent

active

058084363

ABSTRACT:
In order to start a brushless motor, a frequency setting circuit sets a frequency value, a counter increases a count value in response to a main clock signal, and a comparator compared the value of the frequency setting circuit with that of the counter and resets the counter when the compared values are the same. A circuit is also provided for changing the frequency value of the frequency setting circuit to a high frequency value in response to an output signal of the comparator and a back electromotive force detection signal.

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patent: 5616996 (1997-04-01), Tang et al.
patent: 5663616 (1997-09-01), Stringfellow et al.

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