| 摘要 |
PURPOSE:To reduce the fluctuation of torque, by making a winding width to the internal side larger than a winding width to the external side, based on virtual lines at both the ends of a theoretical electrical open angle pi at each unit coil pole of a stator coil. CONSTITUTION:One side main-surface of a rotor magnet 1 having magnetic poles N and poles S which are magnetized alternately and uniformly in the circumferential direction is firmly fitted on a rotor plate 2, and the rotor plate 2 is firmly fitted on a rotary shaft 4 via a sleeve 3. In the meantime, a flattened coil 9 made of a unit coil 1A plane-set in the circumferential direction is set between the rotor magnet 1 and a confronted yoke 8, to be confronted with each other. The unit coil pole 1A is composed so that a winding width b to the internal side may be larger than a winding width (a)to the external side of the unit coil pole 1A at a working radius section 13, based on virtual lines 12 at both the ends of a theoretical electrical open angle pi at the unit coil pole according to the quantity of the magnetic poles, and is wound up so that a relation b/a = 2 may be secured. |
