| 摘要 |
PURPOSE:To reduce the size and the weight by displacing a pair of stator poles disposed at both ends of a coil of a rotor side at different widths, and opposing a permanent magnet rotor thereto, thereby starting to rotate. CONSTITUTION:A rotor 1 of an outer rotor type brushless motor is composed of disc-shaped stator cores 2, 3 and a coil 4, and cylinders 5, 6 are formed at the centers of the cores 2, 3. The first stator poles 9 are suspended from the symmetrical position of the peripheral edge of the core 2 in the width of 150-180 deg. of electric angle, the second stator poles 14 are stool at the symmetrical positions of the peripheral edge of the core 3 at the positions displaced at approx. 200-225 deg. of electric angle in the rotating direction by the half width of the width of the pole 9. Magnetic detecting means 11 is disposed at the side of the first stator pole 9a at a motor mounting stand 17, and the output shaft 21 of a permanent magnet rotor 20 is supported by a bearing 10. Thus, the stator position at deenergizing time is displaced to the rotating direction from the stable position of the rotor 20 at energizing time to obtain a self- starting property. |
