SINE-WAVE CURRENT LINE-START THREE-PHASE RARE-EARTH PERMANENT MAGNET SYNCHRONOUS MOTOR

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A sine-wave current line-start three-phase rare-earth permanent magnet synchronous motor includes a motor shaft (1), a rotor (3) and a stator (6). The rotor (3) is disposed inside the stator (6) and rotates around the motor shaft (1). The rotor (3) includes P pairs of poles. Each pole includes a polar arched surface (302). Aplanar surface (301) is disposed between adjacent polar arched surfaces (302). Thus, a non-uniform air gap (5) is formed between the pole face of the rotor (3) and the inner circumferential surface of the stator (6). By use of a salient-pole structure with the non-uniform air gap, the asymmetry of the magnetic circuit caused by permanent magnets (2) can be offset, with the manufacturing process of the rotor (3)simplified, the negative sequence components of the rotor current during the line starting process of the motor reduced significantly, the starting performance of the motor improved, the sine-wave current provided during the operating process of the motor, the harmonic loss reduced, and the motor efficiency enhanced.