Capacitor run motor

Claim 1

A single phase induction motor of a capacitor run type comprising: a stator including a stator core formed of a circle sectional aperture extending in an axial direction and a plurality of slots formed on the inner surface of said aperture spaced apart from each other in the circumferential direction of the circle section of said aperture and extending in parallel in the axial direction of said aperture, whereby a plurality of teeth are formed between the adjacent two slots, at least two main winding coils, each wound around at least one tooth spaced apart from each other to form a main magnetic pole of the same polarity, whereby at least two main magnetic poles are generated by virtue of excitation by said main winding coils at the displaced positions in the circumferential direction of the circle section of said aperture, said at least two main excited magnetic poles of one polarity causing at least two main image magnetic poles of the opposte polarity at the positions between said main excited magnetic poles as a function of the image effect, whereby at least two pairs of main excited and image magnetic poles are arranged sequentially in the circumferential direction of the circle section of said aperture, and at least two auxiliary winding coils, each wound around at least one tooth spaced apart from each other and dislocated from said at least two main winding coils to form an auxiliary magnetic pole of the same polarity, whereby at least two auxiliary magnetic poles are generated by virtue of excitation by said auxiliary winding coils at the displaced positions in the circumferential direction of the circle section of said aperture, said at least two auxiliary excited magnetic poles of one polarity causing at least two auxiliary image magnetic poles of the opposite polarity at the positions between said auxiliary excited magnetic poles as a function of the image effect, whereby at least two pairs of auxiliary excited and image magnetic poles are arranged sequentially in the circumferential direction of the circle section of said aperture, the auxiliary magnetic field provided by said pairs of auxiliary excited and image magnetic poles interacting with the main magnetic field provided by said pairs of main excited and image magnetic poles to provide a resultant rotating magnetic field, a capacitor connected in series with said auxiliary winding coils for shifting the phase of the current flowing through said auxiliary winding coils with respect to the phase of the current flowing through said main winding coils, a rotor mounted to rotate within said circle sectional aperture under the influence of said rotating magnetic field, bracket means having a bearing means for rotatably supporting said rotor within said circle sectional aperture, said bracket means being mounted to the positions at the end surfaces of said stator core where the coil end does not exist and said image magnetic poles are formed, means for fixing said bracket means to said stator core, said bracket means comprising at least one member having a bridge portion and at least two leg portions, said leg portions being fixed to the stator core at the positions of said image magnetic poles, and the inner surface of said bridge portion of the bracket means being closer to the stator core than the respective outer ends of the stator winding coils.