US PATENT SUBCLASS 388 / 928.1
.~ Counter or back EMF (CEMF)

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388 /   HD   ELECTRICITY: MOTOR CONTROL SYSTEMS

923  DF  SPECIFIC FEEDBACK CONDITION OR DEVICE {6}
928.1.~ Counter or back EMF (CEMF)

DEFINITION

Classification: 388/928.1

Counter or back EMF (CEMF):

Art collection of systems in which an opposing voltage, i.e., counter electromotive force or CEMF, induced in an armature winding, by virtue of the armature's motion within the magnetic field of a field winding is used as a feedback signal in controlling a motor.