| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rotary electrical machine which precisely secures circumferential positions of an auxiliary yoke and a permanent magnet, depresses the permanent magnet to a cylindrical portion via the auxiliary yoke and suppresses occurrence of cogging torque and deterioration in a torque characteristic. <P>SOLUTION: A pair of end rings 25 are separately arranged in an axial direction. Both ends of an auxiliary yoke holding member 26 are fixed to the pair of end rings 25 and are disposed in a circumferential direction at equiangular pitches. Both ends of a permanent magnet holding member 27 are fixed to the pair of end rings 25 and are arranged in the circumferential direction on an inner peripheral side of the auxiliary yoke holding member at the equiangular pitches. The permanent magnet 22 is disposed between the permanent magnet holding members 27, and the auxiliary yoke 21 is installed between the auxiliary yoke holding members 26. When the auxiliary yoke and the permanent magnet are press-fitted to the cylindrical portion 2a, the auxiliary yoke 21 moves inward in a radial direction and moves the permanent magnet 22 inward in the radial direction, and they are held by the cylindrical portion 2a by reaction force operating from the auxiliary yoke holding member 26 and the permanent magnet holding member 27. <P>COPYRIGHT: (C)2012,JPO&INPIT |
