| 摘要 |
PURPOSE:To reduce the leakage flux of a pulse generator magnet and generate stable pulses at a low cost in the pulse generator of a DC motor used for an FDD and the like. CONSTITUTION:A positioning groove of a magnetic sensor 13 is bored on a printed board 9, the magnetic sensor 13 is reversed and buried in the groove, the height of the sensor center 17 of the magnetic sensor 13 is reduced, thus a magnet with a low magnetic flux density can be used for the pulse generator magnet 10, the cost is reduced, and the leakage flux of the pulse generator magnet 10 can be reduced. Since the positioning system of the magnetic sensor 13 is provided, the gap G between the magnetic sensor 13 and the pulse generator magnet 10 is stabilized, and the excellent pulse generator of a DC motor capable of generating stable pulses is provided. |
