Permanent magnet generator no-load loss separation method and device

The invention discloses a permanent magnet generator no-load loss separation method, which comprises the following steps: in a normal pressure environment, on a twin-trawling test platform, dragging a generator to rotate by a motor, measuring the input power of the generator without magnetizing the magnet of the generator, recording the input power as P1, and measuring the input power of the generator with magnetizing the magnet of the generator, recording the input power as P3; in a vacuum environment, measuring the input power of the generator without magnetizing the magnet of the generator, recording the input power as P2, replacing the three-phase winding of the generator with a non-conductive material, and measuring the input power of the generator, recording the input power as P4; in a vacuum environment, the sum of heat at the two ends of a rotating shaft of the generator is measured and recorded as P5, and the inner surface of a fixed part and the outer surface of a rotating part of the generator are