| 摘要 |
PROBLEM TO BE SOLVED: To provide a flat brushless motor which can materialize the avoidance of a dead point surely without deteriorating its torque performance at current application. SOLUTION: This flat brushless motor is equipped with a stator magnetic plate 10, which mounts drive coils 42-45 and magnetic pole detecting elements around a pivot 30, and a rotor 100, in which an annular magnet 50 having N poles and S poles alternately in its circumferential direction at a fan-shaped magnetic pole face of 60°in circular angle is arranged in face opposition to the stator magnetic plate 10 and which is supported rotatably for the pivot 30. It is equipped with holes h<SB>1</SB>-h<SB>3</SB>for generation of cogging torque, which have their hole centers C<SB>1</SB>to C<SB>3</SB>in positions excluding a detection reference line m1 and parting lines m2 and m3, in a region which opposes by face the annular magnet 50 out of the stator magnetic plate 10, and hole edges F<SB>1</SB>to F<SB>3</SB>are formed on the inner side than the peripheral side edge 50b of the annular magnet 50. COPYRIGHT: (C)2009,JPO&INPIT |
