| 摘要 |
PURPOSE:To make sure change-over of energization and stabilize rotation by providing stator wirings of three phases to the six pairs of teeth, always generating one nonenergized phase and supplying all powers in different phases for the teeth provided side by side to change over the energized combination of pairs of teeth on the basis of an induced voltage generated on the nonenergized stator wirings. CONSTITUTION:Stator wirings 20 to 25 are provided to teeth 14 to 19 of the six projected poles of a stator 13, a rotor 26 is magnetized in four poles and moreover the stator wirings 20 to 25 are coupled in three phases so that the teeth provided side by side are in the different phases and the teeth provides opposed with each other are in the identical phase during energization of three phases. All powers are supplied in such a pattern that only two phases among three phases are always energized and combination of the energized phases is changed depending on change of the induced voltage generated when the stator windings 20 to 25 are energized. Thereby, change-over of energization can surely be realized without using a rotating position detecting means such as a Hall element and moreover deviation of magnetic attracting force to the rotor 26 can be prevented to realize reduction of noise and long-life of a bearing. |
