| 摘要 |
PROBLEM TO BE SOLVED: To obtain a permanent magnet type rotary electrical machine that reduces a cogging torque generated by magnetic anisotropy of an electromagnetic steel sheet.SOLUTION: A permanent magnet type rotary electrical machine 1 includes: a rotor 4 having a plurality of magnetic poles formed by permanent magnets 2 and a rotor core 3; and a stator 5 having a toric yoke 8, teeth 9 that are protruded inside from the yoke 8 and provided in the circumference of the rotor 4, and stator windings 7 that are wound around slots 10 sectioned by the teeth 9. The yoke 8 and teeth 9 are integrally constituted by electromagnetic steel sheets laminated in the rotation axis direction of the rotor 4. The shape of the inside of the stator 5 has deformation of a fourth order mode against a complete round. The deformation of the fourth order mode is configured to be deformation such that the diameter of the inside of the stator 5 becomes small in the rolling direction of the electromagnetic steel sheet and the direction orthogonal thereto. |
