Digital, Back EMF, single coil sampling, sensorless commutator system for a D.C. motor
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United States of America Patent
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-
Sep 30, 1997
Issued Date -
N/A
app pub date -
Nov 15, 1994
filing date -
Jun 14, 1993
priority date (Note) -
Expired
status (Latency Note)
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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.
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