Abstract: An electric motor unit includes an electric motor and a connection module. The electric motor includes motor coils, a stator and a rotor. The electrical connection module includes a power feed bus bar and a neutral bus bar. The power feed bus bar includes power feed collars for each phase, in which terminal portions for each phase are arranged. The neutral bus bar includes a neutral collar in which neutral terminal portions are arranged. When viewed in a direction intersecting with a second cross section, which intersects with a first cross section containing all the neutral terminal portions, the minimum distance between a second cross-section neutral terminal row on the second cross section and a second cross-section power feed terminal row on the second cross section is greater than zero.

Abstract: All electric motor unit includes an electric motor and a connection module. The electric motor includes motor coils, a stator and a rotor. The electrical connection module includes a power feed bus bar and a neutral bus bar. The power feed bus bar includes power feed collars for each phase, in which terminal portions for each phase are arranged. The neutral bus bar includes a neutral collar in which neutral terminal portions are arranged. When viewed in a direction intersecting with a second cross section, which intersects with a first cross section containing all the neutral terminal portions, the minimum distance between a second cross-section neutral terminal row on the second cross section and a second cross-section power feed terminal row on the second cross section is greater than zero.

Abstract: A magnet embedded rotor configured to provide an improved magnetization ratio of the field permanent magnets is provided. The magnet embedded rotor includes a first annular core in which first permanent magnets are embedded, and a second annular core in which second permanent magnets, which are independent from the first permanent magnets, are embedded. The magnet embedded rotor has a structure in which the second annular core is fitted onto the outer periphery of the first annular core. The first permanent magnets and the second permanent magnets constitute field permanent magnets.

Abstract: A magnet embedded rotor configured such that the magnetization ratio of field permanent magnets is improved is provided. The magnet embedded rotor includes a first annular core in which first permanent magnets are embedded, and a second annular core in which second permanent magnets, which are independent from the first permanent magnets, are embedded. The magnet embedded rotor has a structure in which the second annular core is fitted onto the outer periphery of the first annular core. The first permanent magnets and the second permanent magnets constitute field permanent magnets.

Abstract: A motor includes a plate-like insulating member that is interposed between coils located next to each other in the circumferential direction. Elastically deformable small protrusions, which protrude radially inward, are formed at an inner side portion of the insulating member, the inner side portion contacting inner covering portions of the insulators. The small protrusions are formed such that the insulating member is allowed to be inserted between the coils from the axial direction when the small protrusions are elastically deformed and the small protrusions are engaged with axial end faces of the inner covering portions.

Abstract: In a method for manufacturing an electric motor, a cylindrical stator core circumferentially dividable into a plurality of core components is inserted into a circular internal surface of a motor housing. In this case, the motor housing is heated to be expanded thermally thereby enlarge circular internal surface thereof. Then, the stator core is fit over the external surface of an, insertion guide head of a generally cylindrical shape, and the insertion guide head is moved ward toward the thermally expanded motor housing secured on a fixed table to insert the stator re inside the motor housing. When the insertion guide head reaches a predetermined axial position inside the motor housing, a pressing mechanism incorporated in the insertion guide head is operated to press the core components on the circular internal surface of the motor using.

Abstract: In a method and apparatus for manufacturing an electric motor, a cylindrical stator core circumferentially dividable to plural core components is inserted into a circular internal surface of a motor housing. In this case, the motor housing is heated to be expanded thermally thereby enlarge the circular internal surface thereof. Then, the stator core is fit over the external surface of an insertion guide head of a generally cylindrical shape, and the insertion guide head is moved upward toward the thermally expanded motor housing secured on a fixed table to insert the stator core inside the motor housing. When the insertion guide head reaches a predetermined axial position inside the motor housing, a pressing mechanism incorporated in the insertion guide head is operated to press the plural core components on the circular internal surface of the motor housing.

Abstract: In a rotor having plural permanent magnets secured on a rotary shaft for use in, e.g., an electric motor which is incorporated preferably into a rack-type electric power steering device, a cylindrical cover is fit on the rotary shaft to cover the external surfaces of the plural permanent magnets, and one or both axial end portions of the cylindrical cover are plastically deformed thereby to secure the cylindrical cover onto the rotary shaft. Thus, the cylindrical cover is firmly secured to the rotary shaft and, even when one or more permanent magnets are separated from the rotary shaft or broken, prevents the separated permanent magnets or the broken fragments from scattering within a housing of the motor.

Abstract: In a rotor having plural permanent magnets secured on a rotary shaft for use in, e.g., an electric motor which is incorporated preferably into a rack-type electric power steering device, a cylindrical cover is fit on the rotary shaft to cover the external surfaces of the plural permanent magnets, and one or both axial end portions of the cylindrical cover are plastically deformed thereby to secure the cylindrical cover onto the rotary shaft. Thus, the cylindrical cover is firmly secured to the rotary shaft and, even when one or more permanent magnets are separated from the rotary shaft or broken, prevents the separated permanent magnets or the broken fragments from scattering within a housing of the motor.