| 摘要 |
PURPOSE:To facilitate the magnetization of a permanent magnet used for a rotor and simple winding to reduce the cost, by appropriately setting the pole width and the dimension of the pole base of each magnetic pole of a stator. CONSTITUTION:A rotor 1 is provided with a cylindrical permanent magnet 2 magnetized with different poles alternately at equal intervals in the circumferential direction, a cup-formed yoke 3, and a rotary shaft 4; and the supply direction of the current in windings 11 arranged in a stator 5 is changed by the output of a magnetism-sensitive element 12. So far as the respective magnetic poles 6a, 6b of the stator 5 are concerned, an electrical angle for the magnetic pole surface width is arranged to be almost 90 degrees, and the width of the magnetic pole base is arranged to be sufficiently smaller than the magnetic pole surface width, and an electrical angle on the side of shorter distance between the magnetic poles is arranged to be almost 140 degrees, and the length from the center to the magnetic pole surface is formed to have a dimensional relation. |
