| 摘要 |
PURPOSE:To enhance the output of a Hall element and to stabilize it by increasing the size of a slot opening of a stator core larger than the other and forming a projection for restricting the insertion of the Hall element inside. CONSTITUTION:A stator core 4 and a circuit board 5 are secured to a holder 3 which rotatably holds a motor shaft 1 on a central bearing 2. A drive coil 8 is contained in the slot 7 of the core 4 to form a stator 9. A circuit board 5 has a Hall element 11 for detecting the pole position and an electronic circuit for distributing a current to the coil 8 by the output from the element 11. Fur ther, a rotor 12 has a cylidrical cup-shaped yoke 13 and a field magnet 14, and is opposed to the salient pole 10 of the stator 9. In this case, the circumfer ential size of the slot opening 15 of the specific slot 7 is formed in size capable of inserting the element 11 to form an element mount 15A formed with a projec tion 16 inward. |
