Permanent magnet synchronous machine

H - Electricity – 02 – K

Patent

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Details

H02K 1/27 (2006.01) H02K 21/24 (2006.01)

Patent

CA 2331835

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.

L'invention concerne une machine synchrone à aimant permanent comportant un stator, un rotor et un entrefer de taille standard entre le stator et le rotor. Le rotor comporte un logement en acier et un certain nombre d'unités à aimants permanents placées les unes derrière les autres à la surface du logement, les pôles de ces unités à aimants permanents étant disposés en alternance. Selon l'invention, une unité à aimant permanent comporte au moins un aimant permanent (12, 12a), dont l'épaisseur (p) est constante, la longueur (x) de l'unité à aimant permanent, ainsi que la longueur de l'aimant permanent (12, 12a) dans le sens du pourtour du rotor correspondant à une seconde constante, tout en étant conformes à la distribution des pôles. Dans la largeur, le côté (13, 14) de l'aimant permanent (12, 12a) correspond sensiblement à l'arc demi-cycle de la courbe y = Asin (x) + Bsin (3x), où A et B sont constants. Les unités à aimants permanents sont magnétisées pour que les pôles (N, P) se trouvent sur des côtés opposés (13, 14), et qu'ils soient placés les uns derrière les autres à la surface du logement, avec leurs côtés orientés vers l'entrefer et le stator. L'enroulement statorique est avantageusement conçu pour que la largeur de la bobine (101) de l'enroulement statorique corresponde à la distribution des pôles.

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