| 摘要 |
PURPOSE:To improve the characteristics of a motor by engaging the small- diameter portion of a driving coil in a recess formed on a stator substrate to reduce an air gap length between a rotor magnet and a back yoke. CONSTITUTION:A through-hole 14 to be engaged with a driving coil 3 is formed except the positioning hole 13 of a Hall element 2 on a stator substrate 1, and engaged with the small-diameter portion of an upper coil 3a. By using the substrate 1 having the coil 3 of different winding, and a coil hole 14 to be engaged with the small-diameter portion (upper coil 3a) of the coil 3, the size of an air gap between a rotor magnet and a back yoke can be reduced to decrease a magnetic path resistance to increase the magnetic flux density of a rotor magnet used for driving a motor, thereby improving the characteristics of the motor. |
