| 摘要 |
PURPOSE:To increase the degree of accuracy of distance between the center of a bearing of a brushless motor and an MR sensor and to control variations in it in the brushless motor detecting the magnetic field obtained from an FG magnet on the peripheral surface of a rotor magnet by the MR sensor and controlling speeds. CONSTITUTION:A bearing housing 3 mounting bearings 2 of a shaft 1 and an MR sensor holder 4 bearing an MR sensor 9 are formed together as one-piece construction of resin, etc. A rotor can be borne on the bearings 2 having no variation with high degree of accuracy within 0.3mm of distance capable of generating power between an FG magnet 10 mounted around a rotor magnet 6 and the MR sensor 9 by one-piece construction, and gap control is not required. |
