| 摘要 |
PURPOSE:To raise a maximum response frequency by arranging main pole teeth and auxiliary pole teeth having narrower width of teeth than that of the main pole teeth at fixed intervals around a permanent magnetic rotor wherein smooth step operation is done for the rotor. CONSTITUTION:Main pole teeth 4a through 4e, auxiliary pole teeth 4f through 4j and main pole teeth 5a through 5e, auxiliary pole teeth 5f through 5j which are formed after cutting magnetic pole substances 4 and 5 respectively are arranged around the rotor 7 having permanent magnets 10, wherein the permanent magnets alternately form plural pieces of N.S poles, for example, ten pieces of magnetic poles by P pitch around the rotor. Two phase winding exciting coils 6 are provided between the magnetic pole substances 4 and 5. The arrangement of pitch for each main pole tooth 4a, 5a... 4e, 5e is made as P and that for each auxiliary pole tooth 4f, 5f... 4j, 5j is also made as P. And each auxiliary pole tooth will be arranged by shifting by pitch 2P/3 for each main pole tooth. Furthermore, the width of each auxi liary pole tooth shall be narrower than that of each main pole tooth. |
