| 摘要 |
PROBLEM TO BE SOLVED: To obtain characteristics closer to 180-degree sinusoidal wave conduc tion by pseudo sinusoidal wave conduction by dividing a drive current over 360 deg. and changing the current value of the drive current into steps. SOLUTION: The motor is provided with a stator 5 of a three-phase distribution winding gear number 12 and a quadropolar stator 6 and a permanent magnet 7 being provided at four locations so that a rotation 6 becomes, synthetic magnetomotive force is rotated counterclockwise as a current phase advances to result in 4e direction with a phase of 60 deg. of the drive current, but a stepwise drive current waveform where an electrical angle of 360 deg. of the conduction waveform is divided into six portions results. Then, as phase is controlled so that the direction of the resultant magnetomotive force reaches center directions 4a and 4e of each stator gear part 2 for switching, the resultant magnetomotive force cannot be bent by the gear part 2, and conduction is made so that a current waveform can be obtained at the middle phase of each section when sinusoidal wave conduction is made, thus successively rotating the direction of the resultant magnetomotive force to the diffraction of the stator gear part and obtaining performance closer to that when 180 sinusoidal conduction is made. |
