DOUBLE-SPEED SYNCHRONOUS/ASYNCHRONOUS MOTOR Russian patent published in 1999 - IPC

FIELD: electrical engineering. SUBSTANCE: multiphase winding of motor is made in the form of parallel circuits with unequal number of series-connected turns; one of circuits is connected in star and other one is through circuit connected in series with rectifier bridge and with field winding mounted on nonsalient-pole rotor. According to invention, stator carries pole-changing winding with pole pairs P₁:P₂. Additional terminals are provided at rectifier input for connecting power supply when P = P₂. In this way, motor can operate at two speeds; it higher speed it runs as synchronous motor with high power characteristics and high overload capacity; at low speed it runs as asynchronous motor. EFFECT: enlarged functional capabilities. 5 dwg