| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a brushless motor capable of attaining highly precise detection of a magnetic pole position even when approximately sinewave sensorless driving is used. <P>SOLUTION: A recess portion 2311 is formed in the center of a magnetic pole of a magnetic flux density waveform 231 of a rotor magnet 23 of the brushless motor 10. A teeth portion 3312 of a stator 33 is shaped such that a value of D1/R1 is approximately 0.9 or less, where a distance between a center shaft J1 to an outermost diameter is R1 and a distance between the center shaft J1 and an inner surface of a wide extension portion 3312b of the teeth portion 3312 is D1. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
