TRANSFORMER-CONTACTLESS SYNCHRONOUS MOTORASSEMBLY Russian patent published in 2012 - IPC H02P1/46 H02P25/30 

FIELD: electricity.

SUBSTANCE: transformer-contactless synchronous motor assembly contains a transformer (2) with a secondary winding having lower voltage (3) and upper voltage (4) three-phase outputs, a synchronous motor with a main (5) and an additional (6) three-phase windings on the stator. The main winding (5) is Y-connected and joined to the lower voltage outputs (3). The additional winding (6) beginning and end are respectively connected to the upper voltage outputs (4) (via the circuit breaker (7)) and to the motor excitation system. The motor contactless excitation system has an asynchronous exciter with two three-phase windings, (8) and (9), on the stator. The winding (8) is connected to the motor additional winding (6) ends. The winding (9) beginnings are connected to those of the additional winding (6) while the ends are connected to the main winding (5) beginning via a commutation apparatus (11) and a three-phase choke (12). Positioned on the common rotating rotor of the motor and the exciter are the asynchronous exciter multi-phase winding (1), a rectifier (14) and the synchronous motor excitation winding (13), all connected in series. The excitation winding (13) is connected to the rectifier (14) rectified current side.

EFFECT: reduction of power loss in the low load mode.

1 dwg