| 摘要 |
PURPOSE:To reduce a torque ripple by specifying the disposition of a groove for windings more than the number of poles of a field. CONSTITUTION:A magnet 3 mounted on a rotor 2 has field poles of P poles (P is 4 or more integer number), and an armature core 4 has teeth formed between grooves (a)-(l) and (a)-(l) for T pieces (T is P or larger integer number) of windings wound with windings of K phases (K is 2 or larger integer number). The core 4 has L pieces (L is integer number) of long teeth at the effective pitch larger than D=360 deg./T, and M pieces (M is integer number) of short teeth at the effective pitch smaller than D, and the numbers of the long and short teeth are set to L>=2, M>=2. When the one pole pitch of a magnet 3 is a fundamental period, the phases of the groove for the windings contained with widings of the prescribed phases are differentiated more than four. |
