(under subclass 34) Subject matter in which means are provided for causing two or more electric motors to operate in one direction at one time and in a reverse direction at another time.
(1) Note. Reversing the motor connections or reversing the application of power to the motors while running, and terminating the application of power to the motors prior to or substantially at the time when the speed of the motors approach zero speed is not included herein but is classified under braking. See subclasses 86+, for braking control for plural motors. There must be a substantial operation of the motors in a reverse direction to be classified herein.
SEE OR SEARCH THIS CLASS, SUBCLASS:
54+, for this subject matter where the system has means for reversing and performing a different control of plural motors.
86+, see Note (1) above.
280+, and the subclasses specified in the Notes to the definition for single motor systems with reversing control.
SEE OR SEARCH CLASS 307, Electrical Transmission of Interconnection Systems,
127, for switching systems which respond to a reverse polarity.
320, Electricity: Battery or Capacitor Charging or Discharging, appropriate subclasses, especially Digest 15, for polarity control in a battery or capacitor charging or discharging system.
