| 摘要 |
PROBLEM TO BE SOLVED: To obtain a motor the starting time of which does not fluctuate much when the motor is manually driven with a sensorless drive circuit which does not require any position detecting element, such as the Hall element, etc., by constituting a bracket which fixes a stator coil and bearing so as to produce magnetic unbalance. SOLUTION: A magnet 1 and shaft 2 are respectively fixed to one surface and central part of a rotor frame 3. A stator coil 5 is wired on a flexible printed board 6 and fixed to a bracket 7 so that the coil 5 can be counterposed to the magnet 1. A bearing 4 which rotatably supports the shaft 2 is fixed to the bracket 7 and the bracket 7 has a notched section 9 so that unbalance can be produced in a magnetic circuit in the notched section 9. Therefore, the fluctuation of the starting time of a motor can be reduced when the motor is driven with a sensorless drive circuit which does not require any position detecting element, such as the Hall element, etc. |
