| 摘要 |
PURPOSE:To increase a counter-electromotive force generated on a motor and smooth the rotation and increase the rotational force, by setting a coil pitch appropriately for the number of the teeth of a stator and the number of the magnetic pole pairs of a rotor. CONSTITUTION:A brushless motor is provided with a rotor 2 having four magnetic pole pairs, and a stator 3 fitted into the rotor 2. The stator 3 is provided with large teeth 5a-5f, small teeth 6a-6f, and slot pairs 4a-4f. When the number of the teeth of the stator 3 is set to be N and the number of the magnetic pole pairs of the rotor 2 is set to be P, then the coil pitches of coils 7 wound up on the large teeth 5a-5f and the small teeth 6a-6f are set to be approx. pi radian and approx. (2P-N/2)2pi/N radian, at the effective electrical angle. |
