Digital, Back EMF, single coil sampling, sensorless commutator s

Details Digital, Back EMF, single coil sampling, sensorless commutator s Digital, Back EMF, single coil sampling, sensorless commutator s

1994-11-15

1997-09-30

Sircus, Brian

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

318254, 318439, 388816, 3889281, H02P 118

Patent

active

056729480

ABSTRACT:
A digital, back EMF, single coil, sensorless up/down counter frequency adjustment system for a d.c. motor includes means for detecting the occurrence of a null voltage during the back EMF commutation state of a field coil; counter means for counting in one direction during the back EMF commutation state and for counting in the opposite direction when the null voltage is detected; means, responsive to the counter means, for ascertaining the final count of the counter means; and means, responsive to the means for ascertaining, for adjusting the frequency of initiation of the commutation states when a non-zero count is ascertained for synchronizing the field coil and the rotor.

REFERENCES:
patent: 5306988 (1994-04-01), Carobolante

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