Digital, Back EMF, single coil sampling, sensorles

专利名称：Digital, Back EMF, single coil sampling,

sensorless commutator system for a D.C.motor

发明人：Adam J. Cohen,Roger L. Holman,Rajesh M.

Nair

申请号：US08/339827申请日：19941115公开号：US05672948A公开日：19970930

摘要：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 nullvoltage during the back EMF commutation state of a field coil; counter means forcounting in one direction during the back EMF commutation state and for counting in theopposite direction when the null voltage is detected; means, responsive to the countermeans, for ascertaining the final count of the counter means; and means, responsive tothe means for ascertaining, for adjusting the frequency of initiation of the commutationstates when a non-zero count is ascertained for synchronizing the field coil and the rotor.

申请人：CAMBRIDGE AEROFLO, INC.

代理机构：Iandiorio & Teska

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