| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor capable of attaining cost reduction by reducing the weight of a rotor because of no frame as a structure. SOLUTION: This motor having a structure made of resin without using a frame 107, includes a plurality of air holes 20 for penetrating the resin portion 19 of the rotor 12 in the axial direction, and with extended projections 21 made of resin on the inner circumferential side. The motor includes through-holes 22 in the axial direction on the outer-periphery surface of the inner side rotor 14 and on the inner-periphery surface of an outer rotor 15 of the rotor and radial resin ribs 24 on step-off portions 23 of the rotor 12 in the axial direction. COPYRIGHT: (C)2008,JPO&INPIT |
