| 摘要 |
PURPOSE:To reduce man-hours for assembly as well as a cost and improve field efficiency, by lengthening tooth and reducing a gap between a housing and a tooth. CONSTITUTION:When the coil 7 of a core 9 is conducted, a field is generated radially and a magnet 3 tries to move into the receiving direction of an attracting force. When a rotating field is generated in the core 9, a rotor is driven to rotate. An axial gap between tooth 8, constituting one part of the core 9, and a housing 2 is made small. According to this method, one part 10 of leakage flux, generated from the tooth 8 of the core 9, affects magnetically to the housing 2 consisting of a magnetic material. In other words, the housing 2 is attracted toward the tooth 8 by the leakage flux 10, therefore, the magnetic attraction force of the rotor is generated in the stator. Accordingly, magnets for attracting rotor may becomes unnecessary, man-hours and cost may be reduced and the field from the core may not be obstructed whereby a field efficiency may be improved. |
