| 摘要 |
PROBLEM TO BE SOLVED: To provide a fan motor of simple structure that enables to stabilize the bias of a drive circuit and the reduce the cost for electronic components applicable to the drive circuit by reducing vibration, when the polarity is switched during operation, and thereby reducing noise during operation and noise produced due to vibration, when the motor is installed in a machine and the quantity of power generated is coils during rotation. SOLUTION: A triangular coil 7 is formed by bifilar winding using a first coil 5 and a second coil 6 and is disposed, so that the center of the coil 7 coincides with the rotational axis of a rotor. The first coil 5 and the second coil 6 are connected with a drive circuit that switches polarity, and the currents passed through the coils are reversed when the polarity is switched. Therefore, the magnetic fields produced in the coil are canceled out, and the attractive force and the repulsive force produced in magnets and the coil are reduced. Thus vibration in the axial direction during motor running can be reduced. Further, the quantity of power generated in the coil can be minimized. |
