| 摘要 |
PROBLEM TO BE SOLVED: To provide a brushless motor which effectively reduces cogging torque. SOLUTION: Each tooth 20 of a stator 22 of the brushless motor is formed on a collar 24, which extends the end parts of the rotor 16 side in the circumferential direction (the X direction in Drawing 2). The collar 24 has a gap with a facing permanent magnet 14, and in such a case, the gap is formed larger at both ends in the circumferential direction (at G1 in Drawing 2) comparing with the center side in the circumferential direction (at G2 in Drawing 2), and the surface of the collar 24 facing the permanent magnet 14 is formed flat. |
