| 摘要 |
A cooling structure for a brushless motor, which includes a stator, a rotor, and a motor shaft arranged integrally with the rotor. The stator includes a stator core including an inner circumferential surface, a cylindrical portion including first and second end surfaces adjacent to the inner circumferential surface, and teeth projecting from the inner circumferential surface. An insulator covers the inner circumferential surface, the first and second end surfaces, and the teeth. A coil is wound around each tooth that is covered by the insulator. The cooling structure includes a cooling fan coupled to one end of the motor shaft and arranged closer to the second end surface than the first end surface. At least one ventilation recess is arranged between two adjacent ones of the teeth in the circumferential direction in a portion of the insulator that covers the first end surface.
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