| 摘要 |
PROBLEM TO BE SOLVED: To eliminate increase of motor diameter and also prevent phenomena such as separation and scattering of a balance weight with a centrifugal force on the occasion of applying the balance weight to a rotor yoke. SOLUTION: In a brushless motor in which a core 3 wound with a winding 7 and a circuit substrate are mounted to the external circumferential surface of a housing 1 and a rotor magnet 11 opposing to the external circumferential surface of core is provided at the internal circumferential surface of the rotor yoke 12 covering the external circumferential surface of core, the balance weight 21 is applied to the internal surface of the rotor yoke 12 and a cutout section 22 for access in the coating of the balance weight is formed to the circuit substrate 2. |
