Abstract: Among eight teeth pairs, one teeth pair is a non-use teeth pair around which an exciting coil is not wound, and other seven teeth pairs are use teeth pairs around which the exciting coil is wound zero or more times. The number Wa of windings of the exciting coil wound around the tooth included in the use teeth pair in a 90° positional relationship with respect to the non-use teeth pair and the number Wb of windings of the exciting coil wound around the tooth included in the use teeth pair in a positional relationship other than the 90° positional relationship with respect to the non-use teeth pair satisfy a relationship of 0?Wa?0.5Wb. The number Wa of windings and the number Wb of windings may satisfy a relationship of 0<Wa?0.5Wb.

Abstract: In a stator or a rotary electric machine, an insulating sheet spreads between two coils adjacent to each other in a circumferential direction in each slot. The insulating sheet covers the end in a third direction of the coil wound in a corresponding tooth, between end surfaces in an axial direction and between an inward-directed surface and an inclined surface in a radial direction. In the slot, an insulating sheet wrapping the adjacent coil is present, but the insulating sheet does not cover the end in a fourth direction of the coil wound around the corresponding tooth.

Abstract: An outer rotor type dynamo has a first magnet and a second magnet which are disposed apart from each other in the axial direction, a first stator yoke disposed facing the inside of the first magnet with a gap, a second stator yoke disposed faced the inside of the second magnet with a gap, a hub shaft which magnetically connects the first stator yoke and the second stator yoke, a comb-like yoke in which both end portions of a plurality of projection pieces extending along the axial direction face different magnetic poles with respect to the first magnet and the second magnet, a bobbin disposed between the first stator yoke and the second stator yoke, and a coil wound around the bobbin.

Abstract: A motor drive system has a brushless motor having coils classified into a group A and a group B, a stator having 12 teeth, around each of which any one of the coils classified into the group A and the group B is wound, and a shaft and a rotor which are provided inside the stator; a controller which applies three-phase voltages to each coil of the group A; a controller which applies the three-phase voltages to each coil of the group B; and a sensor portion which outputs an electric signal according to the rotation angle of the shaft to the controllers. Both the total number of the coils of the group A and the total number of the coils of the group B are 6.

Abstract: A VR resolver comprises a resolver stator and a resolver rotor. Teeth whose number is equal to the product of an integer P of 2 or more and 4 are arranged in an annular shape from the inner circumferential side to the inner side in the diameter direction of the resolver stator. In the resolver rotor, convex portions whose number is equal to the product of an odd number m of 3 or more and the integer P are radially projected. All the stator slots are provided with excitation coils which generate a magnetic field by the application of a voltage. Moreover, all the stator slots are provided with either a first coil or a second coil which outputs electric signals of different waveforms based on the magnetic field.

Abstract: A motor drive system has a brushless motor having coils classified into a group A and a group B, a stator having 12 teeth, around each of which any one of the coils classified into the group A and the group B is wound, and a shaft and a rotor which are provided inside the stator; a controller which applies three-phase voltages to each coil of the group A; a controller which applies the three-phase voltages to each coil of the group B; and a sensor portion which outputs an electric signal according to the rotation angle of the shaft to the controllers. Both the total number of the coils of the group A and the total number of the coils of the group B are 6.

Abstract: A first rotor and a second rotor in which first steel plates in which a plurality of first through holes into which magnets are inserted are formed circumferentially apart from each other are laminated such that the first through holes are axially continuous, a second steel plate in which second smaller through holes are formed. circumferentially apart from each other and is laminated axially at one end side, and the magnet inserted into each of the first through holes of the first and second rotor, The first and second rotor are connected to the same shaft such that the second steel plates serve as the outer sides in the axial direction and the position in the circumferential direction of each of the first through hole is shifted.

Abstract: A stator includes split cores arranged in a cylindrical shape. Coils are wound continuously around teeth of split cores forming the same electrical phase via a bridge line. On the outer surface of the split core, openings are formed at the upper end face and the lower end face. Through these openings, a convex portion of a jig is inserted to an engagement groove, whereby the split core is supported by the jig. A bridge line of each coil is led out from the teeth side to the outer surface side through an outlet. The led-out bridge lines are placed in storage grooves in a mutually non-contact manner.

Abstract: A technique of facilitating a coil winding work by continuously winding coils in the same direction, in a stator in which a plurality of coils constituting a coil group of the same phase are respectively arranged so as to include positions at which phases of induction voltage are different, whereby coil groups of three phases are disposed in a ring shape.

Abstract: A stator includes split cores arranged in a cylindrical shape. Coils are wound continuously around teeth of split cores forming the same electrical phase via a bridge line. On the outer surface of the split core, openings are formed at the upper end face and the lower end face. Through these openings, a convex portion of a jig is inserted to an engagement groove, whereby the split core is supported by the jig. A bridge line of each coil is led out from the teeth side to the outer surface side through an outlet. The led-out bridge lines are placed in storage grooves in a mutually non-contact manner.

Abstract: A rotor for a brushless motor which can securely prevent an idle running and a scattering of a magnet while restricting a manufacturing cost as low as possible. The rotor is provided with a sintered ring magnet in which not-ground recess portions are formed in an axial direction of a inner peripheral surface in correspondence to a magnetic pole, and a portion between the recess portions is ground in an inner peripheral surface having a desired inner diameter, a rotor yoke in which convex portions each having a larger diameter than the inner diameter of the sintered ring magnet are formed in an axial direction of an outer peripheral surface in correspondence to the recess portion, and a through hole is pierced in an axial center, and which is concentrically adhered to the sintered ring magnet by fitting the recess portions and the convex portions, and a shaft inserted and fitted to the through hole of the rotor yoke.

Abstract: The invention provides a technique of facilitating a coil winding work by continuously winding coils in the same direction, in a stator in which a plurality of coils constituting a coil group of the same phase are respectively arranged so as to include positions at which phases of induction voltage are different, whereby coil groups of three phases are disposed in a ring shape.

Abstract: The invention provides a means which can securely prevent an idle running and a scattering of a magnet while restricting a manufacturing cost as low as possible, in a rotor used in a brushless motor.