| 摘要 |
PROBLEM TO BE SOLVED: To protect coils and Hall elements from the influence of the heat for shrinkage fit even if the coils and the Hall elements are attached to a main housing to which the fixed shaft of a dynamic pressure bearing is fixed by sharinkage fit. SOLUTION: After a fixed shaft 7 is fitted to the opening hole 6 of a main housing 32 by shrinkage fit, coils 13 and Hall elements 15-17 are attached to the main housing 32. As the heat for shrinkage fit does not have the influence upon the coils 13, etc., a winding frame 34 for the coils 13 can be made of resin to realize a coreless motor. By attaching the coils 13, etc., and the fixed shaft 7 to one main housing 32, the productivity and the assembly precision can be improved. |
