| 摘要 |
PROBLEM TO BE SOLVED: To aim at reduction in the manufacturing cost, downsizing and reduction in weight of a disk drive, and maintain stability of a motor rotation and improve operation stability of the disk drive. SOLUTION: The inner rotor motor comprises a rotor 2 with a plurality of magnetic poles 25n and 25s arranged circumferentially, and a stator 3 in which coils 33a-38a are installed to each magnetic pole teeth 33-38 of a stator core 31 with the plurality of magnetic pole teeth 33-38 placed circumferentially outside the rotor 2 and facing the rotor 2. The stator 3 is placed in the range within 180 deg. with respect to the center 21 of the rotor 2, coils 33a-38a are set so that each adjacent coils 33a-38a has different winding numbers N33-N38, and at the same time the sum of the winding number of the coils 33a-38a for each phase Nu, Nw, Nv is set to be equal, respectively. |
