发明名称 Motor
摘要 A motor comprises a rotor having an index signal generating portion on a rotor magnet and a magnetic resistance sensor having a magneto-sensitive surface. The sensor is positioned on a stator of the motor facing the index signal generating portion of the rotor with a predetermined gap. The sensor functions to sense an index signal in the magnetic field generated by the index signal generating portion during the rotation of the rotor. A speed detection circuit is included for detecting the speed of the motor based on the detection results of the magnetic resistance sensor. The index generating portion forms a magnetic area in which a magnetic flux intensity in a plane orthogonal to the principal magnetic flux of the index signal generating portion is greater than the rated sensitivity of the magnetic resistance sensor. The magnetic resistance sensor is positioned on the magnetized area such that its magneto-sensitive surface is parallel to the plane. The magnetic resistance sensor has an output which is in a saturated state.
申请公布号 US6417587(B1) 申请公布日期 2002.07.09
申请号 US19970839166 申请日期 1997.04.23
申请人 SANKYO SEIKI MFG. CO., LTD. 发明人 KOMATSU IZUMI;KATSUNO HIROHIKO
分类号 H02K29/14;H02K11/00;H02K29/08;(IPC1-7):H02K29/08 主分类号 H02K29/14
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