| 摘要 |
PURPOSE:To increase the volumetric ratio of winding per unit volume of a motor and make the motor highly efficient, by a method wherein magnetic flux is concentrated to an inner cylindrical magnetic pole and an outer cylindrical magnetic pole while respective phases are arranged in the areas of plularity of radius of curvatures in the radial direction of a stator. CONSTITUTION:Cylindrical driving coils 28, 30, 32 of plurality of phases, which are provided with different radius of curvatures, are arranged concentrically in a stator 24 while inner cylindrical magnetic poles 34, 38, 42 and outer cylindrical magnetic poles 36, 40, 44 are arranged concentrically at the inside and outside of said driving coils. Magnetic pole teeth, having predetermined phase angles, are formed in front of the inner cylindrical magnetic poles 34, 38, 42 and the outer cylindrical magnetic poles 36, 40, 44 while magnetism intercepting rings 52, 54, 56 are arranged between the magnetic pole teeth of the inner cylindrical magnetic poles 34, 38, 42 and the outer cylindrical magnetic poles 36, 40, 44 in front of the cylindrical driving coils 28, 30, 32 of respective phases. A plurality of magnetic pole teeth is formed on a rotor disc 26 while the magnetic pole teeth are opposed to the magnetic pole teeth of the stator 24 through air gaps. |
