| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a skin effect in a DC brushless motor in which plural coils generating a rotating magnetic field are arranged in a circumferential direction on a stator side and plural magnets are arranged in the circumferential direction on a rotor side with a pitch different from that of the coil. <P>SOLUTION: In a stator 2, a coil 21 is composed of an air-core coil which is wound so that its width direction is parallel with its axial direction. The coil 21 is sandwiched between a pair of yokes 23 from both sides in the axial direction, the yokes 23 being composed of: a holding part 231 which is made of a soft magnetic material and captures a magnetic flux; and a tongue part 232 that inwardly extends in a radial direction from the holding part 231. A magnet 31 of a rotor 3 is arranged so as to traverse the magnetic flux between the tongue parts 232. Thus, the generated magnetic flux in the coil 21 passes through in an axial direction of the motor (i.e. the width direction of a belt-like conductor) due to the holding part 231 of the pair of yokes 23, so that a skin effect can be restricted. <P>COPYRIGHT: (C)2012,JPO&INPIT |
