| 摘要 |
PROBLEM TO BE SOLVED: To prevent a decrease in permeance, by forming small tooth members with at least a pitch between them different from the other pitches, and making at least one of these tooth members with a tooth width different from the other tooth members. SOLUTION: In six small tooth members T1 to T6 in each stator magnetic pole, each pitch between tooth members T3 and T4 , T2 and T5 , and T3 and T1 and T6 is made the same, while tooth members T3 and T4 have a pitch of A, tooth members T3 and T2 , and T4 and T5 have a pitch of B, and tooth members T2 and T1 , and T3 and T6 have a pitch of C, where these pitches A, B, and C are different. That is, A=6.66 deg., B=6.84 deg., and C=7.38 deg., and the small stator tooth members coming near to the small rotor tooth members made circularly at intervals have phase difference of 0.5δ1 =0.075π, 0.5δ2 =0.175πor 0.5δ3 =0.125π. The permeance is 92% that is larger than a prior art embodiment.
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