(under subclass 66) Subject matter in which means are provided for controlling the field circuit or the secondary circuit of two or more motors for controlling the (group) speed of the motors.
SEE OR SEARCH THIS CLASS, SUBCLASS:
79, for plural motor systems having combined armature and field circuit control for controlling the relative speed between two or more motors.
81, for plural motor systems having fields or secondary circuit control for controlling relative speed between two or more of the motors.
97, for plural motor systems having field or secondary circuit control of two or more motors during the acceleration period thereof.
521+, and the subclasses listed in the search notes thereto, for single motor systems having field circuit control for the motor.
