| 摘要 |
PROBLEM TO BE SOLVED: To facilitate manufacturing of the component of a center phase having an intricate shape in an inner rotor brushless motor having a coil formed by concentrated winding. SOLUTION: In the stator of n-phase n×m pole (n is an integer of 3 or above, m is an integer of 1 or above) brushless motor comprising a ring-like yoke part and n×m salient poles projecting from the yoke part to the inner circumferential side, the yoke part 20 is divided in the axial direction into 2(n-1) ring layers. Salient poles corresponding to the first phase and the n-th phase and two outer ring layers are provided, respectively, with a first layer stator part and a n-th layer stator part formed integrally, and second to (n-1)th phase stator parts where salient poles corresponding to the second to (n-1)th phases and an inner ring layer are formed integrally. The second to (n-1)th phase stator parts are divided into two in the axial direction. Since stators of all phases have one flat side, they can be molded easily using a die. Since lubricant can be applied sufficiently to the die, molding is facilitated. COPYRIGHT: (C)2004,JPO |
