SYNCHRONOUS INDUCTION MOTOR Russian patent published in 2008 - IPC H02P27/06 

FIELD: electricity.

SUBSTANCE: invention relates to electrical engineering, and particularly to induction motors with phase rotors of common industrial design operating in cyclic mode under rotation frequency control. The synchronous induction motor consists of a stator with three-phase coil. Starting terminals of the coil are connected to the three-phase power supply output, whereas finite terminals are coupled with three-phase bridge rectifier input. The motor also includes three-phase coiled rotor. The terminals of rotor coil are connected to the three-phase bridge inverter output. Anode input of the bridge inverter is linked with the cathode output of rectifier. Cathode inverter input is connected with anode output of the rectifier. Three-phase power supply is implemented as frequency converter with its input connecting supply line. There is provided a separate free-wheeling diode in the three-phase bridge inverter, which is in parallel opposition to each fully-controlled valve. Control inputs of valve are connected to double-mode control unit output for bridge inverter.

EFFECT: control of synchronous motor rotation speed under absolute stiff mechanical characteristics, reduction of speed and motor moment fluctuations when currents are switched over in rotor coils, reduction of energy losses during motor startup.

3 dwg, 1 tbl