| 摘要 |
The invention relates to a permanent magnet synchronous machine comprising a stator, a rotor and a standard-size air gap in between the stator and the rotor. The rotor includes a housing made of steel and a number of permanent magnet units fitted successively on the housing surface, so that the poles of the permanent magnet units alternate in turns. According to the invention, the permanent magnet unit includes at least one permanent magnet piece (12; 12a), which is constant in thickness (p), and the length (x) of the permanent magnet unit and simultaneously the length of the permanent magnet piece (12; 12a) in the direction of the rotor circumference is a second constant and conforms to the pole distribution. In width, the side (13, 14) of the permanent magnet piece (12, 12a) roughly corresponds to the half-cycle arc of the curve y = Asin (x ) + Bsin (3x), where A and B are constants. The permanent magnet units are magnetized so that the poles (N, P) are located on opposite sides (13, 14) and are fitted successively on the housing surface, with their side pointed to the air gap and the stator. The stator winding is advantageously arranged so that the width of the coil (101) of the stator winding corresponds to the pole distribution.
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