| 摘要 |
PURPOSE:To smoothen a magnetic flux distribution, and to enhance a rotary torque by securing by welding auxiliary poles having higher reversible permeabil ity than that of the permanent magnet of a main pole to the inner periphery of a yoke, and then allowing a nonmagnetic member of substantially triangular section to adhere to the side face of the auxiliary pole and the inner periphery of the yoke. CONSTITUTION:After an auxiliary pole 4 having higher permittivity than that of the permanent magnet of a main pole 3 is secured by welding to the inner periphery of a yoke 2, a nonmagnetic member 6 of substantially triangular section adheres to the side face of the pole 4 and the inner periphery of the. yoke 2 to form a leakage magnetic path shut-off part having larger air gap than that between a rotor 7 and a stator 1 at the radial outside. Thereafter, after the pole 3 made of anisotropic permanent magnet is positioned along the side face of the member 6 and the inner periphery of the yoke 2, the pole 3 is so secured as to be disposed adjacent to the pole 4 through the member 6 to the inner periphery of the yoke 2 with an adhesive material 31. |
