Patent ID: 9577497
Date: 2017-02-21
CPC Classifications: H02K

Claim:
1. A rotating electric machine comprising: a rotation shaft; a rotor core fixed on the rotation shaft; a plurality of magnetic poles extending radially outward from the rotor core; a plurality of soft magnetic poles extending radially outward from the rotor core at positions between the plurality of magnetic poles; a plurality of teeth extending radially inward to face the plurality of magnetic poles and the plurality of soft magnetic poles; a cylindrical back yoke connected to each of radial outside ends of the plurality of teeth; a first housing fixing the cylindrical back yoke relative to the rotation shaft; a stator conductor positioned between each of the plurality of teeth; a detection magnet fixed on one end of the rotation shaft and generating a magnetic field to indicate a rotation position of the rotor core; and a magnetic sensor facing the detection magnet, detecting the magnetic field, and outputting a signal according to the magnetic field as the rotation shaft rotates, wherein when (i) a radial distance of a space between magnetic poles and the plurality of teeth is designated as a first space distance, (ii) a radial distance of a space between soft magnetic poles and the plurality of teeth is designated as a second space distance, and (iii) a consequential component is positioned a shortest distance from a center of the magnetic sensor, and the consequential component is defined as one of the cylindrical back yoke or the first housing, the shortest distance between the center of the magnetic sensor and the consequential component is equal to or greater than 50 times of a sum of the first space distance and the second space distance.