Back to results
US 2006/0125334 A1Published application
Motor
AssigneeNidec Corporation
InventorsNakaba Kataoka, Keita Nakanishi
Life of this patent
Estimating the term…
Abstract
In a motor, an sensor magnet is attached to a shaft and three hole sensors for detecting the position of the sensor magnet are mounted on a circuit board. By using neodymium-iron-boron base rare earth magnet having radial anisotropy as a sensor magnet, the detection accuracy for the position of a field magnet via the sensor magnet by the hole sensor can be improved.
Claims14
An electric motor comprising:
- a static part includes a stator;
- a field magnet having a cylindrical shape;
- a rotor part having the field magnet for generating a torque around a central axis with respect to the stator;
- a bearing part for supporting the rotor part rotatably with respect to the static portion around the central axis;
- a sensor magnet that is a substantially ring-like rare earth anisotropic magnet and magnetized in multiple poles, the sensor magnet secured on the rotor part and arranged with the field magnet coaxially;
- and
- a sensor disposed so as to oppose the sensor magnet, for detecting the position of the sensor magnet.
4 more elements
Dependencies are inferred from the claim text.