(under subclass 720) Subject matter wherein the electric circuit includes a static type of power converter which generates an electric wave-form which can be used by the alternating current winding of the motor.
(1) Note. Subject matter of this subclass types includes, for example, cycloconverters, rectifier inverters, and controlled and free-running oscillators and vibrators which can generate electricity having a waveform useable by the motor.
(2) Note. The power converter of this subclass type can include vacuum tubes or solid-state devices which must be electrically powered to operate as a generator.
(3) Note. The frequency of the converters of this subclass type can be varied or switched between two different frequencies, and generally with a change in frequency the voltage of the waveform is changed accordingly.
SEE OR SEARCH THIS CLASS, SUBCLASS:
138, for space discharge commutated motors.
768, for three phase induction motors operated from a single phase source.
800+, for induction motor primary circuits including controlled power conversion during motor starting. 807+, for induction motor primary circuits involving frequency control of the circuit.
SEE OR SEARCH CLASS
307, Electrical Transmission or Interconnection Systems,
151, for conversion systems and subclass 154 for miscellaneous systems with a specifically recited load device.
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,
365+, for miscellaneous gating circuits and subclasses 100+ for miscellaneous signal shaping, converting, or generating.
363, Electric Power Conversion Systems,
13+, for current conversions, subclasses 148+ for phase conversions; and subclasses 157+ for frequency conversions.
