| 摘要 |
PURPOSE:To constitute a motor inexpensively, by using a resin magnet made of resin material and permanent magnet material, and by forming a permanent resin magnet by insert forming, etc. CONSTITUTION:A brushless motor 15 is composed of an annular (discshaped) main permanent resin magnet 18 magnetized to the first plane section 16 in multiple specified poles and that magnetized in multiples to an outside circumferential surface 41, a back yoke 19, a rotor 21, a stator 23 having a stator plate 22, a winding 7 and a rotating position detecting section 8. This back yoke 19 is put into a forming metal mould of the main permanent resin magnet 18 in advance and integrally formed with the magnet 18 with insert forming, etc. A rotating frequency detecting means 40 is provided near the outside circumferential surface 41 of the magnet 18, with which the rotating frequency of the rotor 21 is detected by detecting the magnetization given to the magnet outside circumferential surface 41. |
