| 摘要 |
PURPOSE:To increase the output torque of a brushless motor, by a method wherein an axial center core and a side yoke are provided in each driving coil to concentrate a flux generated by the driving coil. CONSTITUTION:A 4-phase stepping motor 10 is equipped with a frame 12, a disc-type stator yoke 14 and a housing 16. Center cores 36, 38, 40, 42 for concentrating flux generated in driving coils are arranged at the center of the driving coils 28, 30, 32, 34, arranged on the stator yoke 14. Side yokes 44, 46, 48, 50 are fixed onto the stator yoke 14 radially from these center cores 36, 38, 40, 42 with a given space so as to be extended axially from the stator yoke 14. |
