The present invention relates to an induced polarization AC motor having maximized efficiency, a stator of the AC motor being provided with 2n number of winding slots and 2n number of induced polarization slits so that when electricity is applied to the stator having just n number of slots distributedly wound, polarization is induced on the magnetic field surfaces on both sides of the winding slots to double the magnetomotive force for operating and rotating the rotor. Here, the rotational direction is determined by the Fleming left-hand rule.

A method for shaping a one- or multi-part wave winding which is intended for insertion into a rotor, a stator or an insertion tool and consists of one or more conductor wires in a magazine is disclosed. The method includes introducing the wave winding, by means of straight portions of the conductor wires, into receptacles of the magazine; pressing the wave winding into the receptacles of the magazine, as a result of which shaping of the conductor wires is brought about and the conductor wires are molded to the receptacles; and them transferring the wave winding with the shaped conductor wires to an insertion tool, a stator, or a rotor. A wave winding, is produced according to the method, in which the straight wire portions have a cross section which is adapted to the groove.

A coil molding apparatus being capable of easily forming the band-shaped coil into a wound state, without the winding posture in the coil winding jig being disturbed by spring back of the band-shaped coil. The coil molding apparatus includes: a coil winding jig for winding the band-shaped coil with inserting straight portions thereof into a plurality of comb-shaped grooves in the outer periphery; a coil conveying mechanism unit for pivotally conveying the band-shaped coil along the outer periphery of the coil winding jig; and guide members for inserting the band-shaped coil into the plurality of comb-shaped grooves by guiding in an arc shape while contacting with the side end of the band shaped groove thereby gradually reducing in diameter accompanying pivoting at a second half portion of pivot conveying of the band-shaped coil, then extending with maintaining curvature of the portion of which the diameter has already been reduced.

The present disclosure is directed to slotless electric motor, in particular, to a method of manufacturing a stator for a slotless electric motor. An aspect of the disclosure provides a method of manufacturing a stator for a slotless electric motor, the method comprising: disposing a conductor in the shape of an annular cylinder; bonding a plurality of bonded lengths of the conductor, wherein the plurality of bonded lengths are separated by non-bonded lengths; folding the conductor to provide a plurality of petals repeated along the conductor, wherein each petal comprises a pair of bonded lengths connected by a non-bonded length; rotating each petal about a point on the second circle to align in parallel the bonded lengths of all of the petals to thereby provide a stator comprising a cylindrically-shaped conductor wherein the bonded lengths are equidistantly disposed around and from a central longitudinal axis of the cylindrically-shaped conductor.

The present disclosure is directed to slotless electric motor, in particular, to a method of manufacturing a stator for a slotless electric motor. An aspect of the disclosure provides a method of manufacturing a stator for a slotless electric motor, the method comprising: disposing a conductor in the shape of an annular cylinder; bonding a plurality of bonded lengths of the conductor, wherein the plurality of bonded lengths are separated by non-bonded lengths; folding the conductor to provide a plurality of petals repeated along the conductor, wherein each petal comprises a pair of bonded lengths connected by a non-bonded length; rotating each petal about a point on the second circle to align in parallel the bonded lengths of all of the petals to thereby provide a stator comprising a cylindrically-shaped conductor wherein the bonded lengths are equidistantly disposed around and from a central longitudinal axis of the cylindrically-shaped conductor.

The present disclosure is directed to slotless electric motor, in particular, to a method of manufacturing a stator for a slotless electric motor. An aspect of the disclosure provides a method of manufacturing a stator for a slotless electric motor, the method comprising: disposing a conductor in the shape of an annular cylinder; bonding a plurality of bonded lengths of the conductor, wherein the plurality of bonded lengths are separated by non-bonded lengths; folding the conductor to provide a plurality of petals repeated along the conductor, wherein each petal comprises a pair of bonded lengths connected by a non-bonded length; rotating each petal about a point on the second circle to align in parallel the bonded lengths of all of the petals to thereby provide a stator comprising a cylindrically-shaped conductor wherein the bonded lengths are equidistantly disposed around and from a central longitudinal axis of the cylindrically-shaped conductor.

A method for producing a winding for a stator, the stator itself, a method for producing the stator and an electric rotating machine. The method for producing a winding for a stator of an electric rotating machine provides a first conductor and a further conductor, wherein the two conductors are bent into a zigzag form, at least in length portions, and the further conductor is moved with respect to the first conductor in a combination movement, which has a translatory movement component along the longitudinal axis of the further conductor and a rotary movement component about the longitudinal axis of the further conductor, such that the further conductor winds around an extreme value axis of the first conductor, which runs through regions f the first conductor, said regions forming extreme values of the zigzag course. The method for producing a winding for the stator, and the stator itself, the method for producing the stator and the electric rotating machine provide solutions that permit the winding, and accordingly also the stator comprising the winding and the electric rotating machine comprising the stator, to be produced at low cost and with little effort.

A coil forming apparatus is configured so as to, upon forming a band-shaped coil having side ends at both ends of a plurality of straight portions, in the course of pivotally conveying the band-shaped coil along the outer circumference of a coil winding jig by a coil conveying mechanism, sandwich the side end by a reforming portion of guide member, reform the band-shaped coil into an arc shape, then insert a plurality of the straight portion into a respective one of the plurality of comb-shaped grooves with reducing a diameter of guiding transfer way of the guide member while pressing a steady laminated part of the band-shaped coil in sliding contact manner, thereby inserting a plurality of the straight portion into a respective one of the plurality of comb-shaped grooves, possible of easily forming the band-shaped coil into a precisely wound state.