A description is given of a novel brushless stator DC-excited synchronous motor without a rotating AC exciter. The DC-exciting winding, having pole numbers different from that of the main three-phase winding, is incorporated in the stator. The rotor circuit consists of field coils short-circuited with diodes. The principle together with analytical and experimental studies of the PWM-inverter-fed brushless synchronous motor is explained. It is found that the power factor of the motor can be easily controlled by adjusting the stator DC current.
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