| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a flat type coreless motor and a flat type coreless vibration motor capable of preventing a magnetic pole of a magnet from stopping at a dead point, and of reducing a mechanical loss due to a suction action of the magnet. <P>SOLUTION: In a flat type coreless vibration motor 1, magnetic poles 15a of a N-pole and a S-pole are arranged alternately on a rotor 3, and a coil 23, a yoke 19, and a magnetism detecting member 27 are provided on a stator 7. The yoke 19 has radial belt-like ribs 25a-25c, a space K is formed between the adjacent belt-like ribs 25a and 25b, and 25a and 25c. The magnetism detecting member 27 is provided at a position deviated from the middle Q between the adjacent belt-like ribs 25a and 25b or 25a and 25c. The width W1 of the belt-like rib is narrower than the width W3 of the magnetic pole, and among three belt-like ribs 25a-25c, an interval between a pair of adjacent belt-like ribs 25a and 25b is made to be (360 degrees/n)+a degrees, and an interval between the other pair of adjacent belt-like ribs 25a and 25b is made to be (360 degrees/n)-a degrees. <P>COPYRIGHT: (C)2012,JPO&INPIT |
