| 摘要 |
PURPOSE: A rotation speed sense device of a motor is provided to minimize the consumption amount of expensive magnet as well as to effectively sense the rotation speed of motor without attaching the magnet to the rotator of the motor. CONSTITUTION: A rotation speed sense device of a motor includes a magnet(1) fixed to a stator placed adjacent to a rotator(4) of the motor, a magnetic material(3) fixed to the rotator(4) of the motor, a hall sensor(2). The hall sensor(2) senses the magnetic flux change of the magnet(1) due to the magnetic material(3) fixed to the rotator(4) of the motor. The magnetic material(3) is placed on the axis of the rotator(4) of the motor. |
