| 摘要 |
PROBLEM TO BE SOLVED: To make all the regions of field magnetic poles effective sections contributing to the torque by setting the open angle from the shaft center being opposed to the stator of magnet fields into a specific range. SOLUTION: When the number of slots of a stator is twenty four, and the number of poles of the motor is four, the mechanical angle of the winding pitch per every phase and pole of each slot of the stator 30 is 75 deg., and the mechanical angleθ2 of the slot pitch is 15 deg.. Besides, the pitch angleθ1 of effective magnetic poles excluding zero regions out of a resultant magnetomotive force becomes a mechanical angle 75 deg.. And if the rotor is rotated in the stator, interlinking magnetic flux changes, and a section where a peak induced voltage is generated is 120 deg. by arm electric angle, and coincides with a conduction section 120 deg.. But the total of the interlinking magnetic flux makes an approximately stepwise change, since the magnetic flux is deflected in an air gap 38. Accordingly, magnetic flux does not change very much, while the field magnetic poles having an open angle of (θ1-θ2) make one slot-pitch worth of move. As the result, it becomes possible to make all the regions of the field magnetic poles effective sections contributing to the torque. |
