(under the class definition) Subject matter in which means are provided for facilitating or otherwise controlling commutation in commutator motors.
(1) Note. For example, means for preventing or reducing deleterious effects incident to, or accompanying, commutation in electric motors are included herein; such effects including large intercommutator bar currents, heating of commutator bars and brushes, flashover between bars, arcing and pitting of commutator bars and brushes, etc. Periodically or repeatedly reversing polarity of direct current supplied to commutator motors to reduce pitting, corrosion metal transfer between brush and commutator is included herein. Shifting of brushes to reduce sparking is included.
SEE OR SEARCH THIS CLASS, SUBCLASS:
138, for motor systems having electric space discharge means for commutating the motor.
434, for motor systems having means for limiting motor armature or primary circuit current or load which may also reduce or otherwise control sparking, flash-over or other deleterious effects at the commutator in a commutator type motor.
SEE OR SEARCH CLASS
310, Electrical Generator or Motor Structure, 220, for spark reduction means for commutators for dynamoelectric machines.
