| 摘要 |
A motor according to an embodiment includes a motor body, a rotating body, and a magnetic field sensor. The motor body rotates a shaft about the axis line thereof. The rotating body includes a permanent magnet with the long direction thereof serving as the magnetization direction and rotates along with the rotation of the shaft. The magnetic field sensor includes a magnet body having a large Barkhausen effect with the long direction thereof serving as the easy magnetization direction and is positioned to face the permanent magnet when the rotational position of the rotating body is at a given rotational position. The magnetization direction of the permanent magnet and the easy magnetization direction of the magnetic body are in a direction along a plane orthogonal to the rotation center line of the rotating body. |
