Hitachi, Ltd.

Other

Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Hitachi Car Engineering Co., Ltd.

Yasuhiko Kimura

Toshiaki Ueda

Yoshimi Mori

Takashi Yasuhara

Masahiko Honma

Takeshi Sakai

Sanshiro Obara

Suetaro Shibukawa

Fuminori Ishikawa

Kenichi Nakayama

Osamu Koizumi

Hiroshi Kanazawa

Toshio Ishikawa

Shin Onose

Masato Higuma

Keiji Kawahara

Hidemitsu Kobayashi

Hiromichi Anan

Yosuke Umesaki

Yoshikazu Kadowaki

Syuichi Hara

Suetarou Shibukawa

Takefumi Oowada

Hisashi Kondo

An object of the present invention is to suppress variations in an angle of a shoulder part of a segment coil to improve easiness in inserting segment coils in a stator core. A stator of an electric motor according to the present invention includes a stator corein which a plurality of slotsare formed, and a plurality of segment coilsof U shapes inserted respectively in the plurality of slots The segment coilincludes a shoulder partand a shoulder partthat are bent to form a U shape. In a front view of the U shape, a press markis formed on the shoulder partand on the shoulder part, the press mark being a dent sinking in a front-to-rear direction, from a front surface of the shoulder partand from a front surface of the shoulder part. The press markis formed also on a back surface of the shoulder partand on a back surface of the shoulder part

Stator of electric motor and manufacturing method for stator of electric motor

An object is to provide a rotating electric machine offering a high output and high efficiency by balancing inductance of each phase even if a stator is used in which stator windings of different phases are disposed in a slot of a stator core in a three-phase winding. A statorincludes a stator corehaving a plurality of slots arrayed circumferentially and opening to an inner peripheral surface and a stator windingwound in each of the slots. The stator windingis divided into at least two for each phase (U-A,U-B,V-A,V-B,W-A,W-B). After insertion of the stator core, the stator winding of each phase is connected in parallel or in series. The stator winding of each phase is disposed in slots such that combined inductance of different phases is equalized.

Stator winding for rotating electric machine

When electric wires (joint conductors) are disposed adjacent each other in a peeled state of coatings, a gap corresponding to the total thickness of both conductors' insulating films as skin layers is formed between end joined face portions of the conductors. The gap becomes larger because the conductors are tapered. Therefore, the adhesion between both conductors is impaired, with a consequent fear of occurrence of joining imperfection. In opposed joined face portions of electric wires (joint conductors), the conductors are deformed from the tips of their axes to the joined face side in such a manner that exposed portions at the tips of the conductors and insulating film faces located in the vicinity thereof are flush with each other or the exposed portions are projected. The gap formed between the electric wires (joint conductors) can be diminished, whereby the reliability of connection is improved and it becomes easier to perform the work of joint conductors, with the result that the productivity of a stator of a rotary electric machine such as an AC generator for a vehicle could be improved.

Joint structure of electric wire, stator of rotary electric machine, method for manufacturing the same

A rotary machine having a stator composed of a stator iron core having a plurality of slots formed in the direction of the rotation axis and stator windings inserted into the plurality of slots, wherein the stator windings are composed of a plurality of conductors respectively inserted into the plurality of slots in the direction of the rotation axis and the stator has a connection ring having slots into which the plurality of conductors are inserted in the direction of the rotation axis.

Rotary machine

Each of a plurality of unit windingsis formed by being divided into a first winding sectionhaving opened end portions and a second winding section, and the first winding sectionis shaped in such a manner that a step in radial direction of a stator coreis formed between opposing side sectionsandand the opened end sections are bent in the crossing over direction of the winding so that open endsandof the opened end sectionsoppose each other in the radial direction of the stator core, then the open endsandare connected by winding conductor piecesandof the second winding section to complete the unit winding, thereby, end sections of a stator winding are shortened and a small size dynamo electric machine is realized.

Dynamo electric machine and method of manufacturing the same

Each of a plurality of unit windings is formed by being divided into a first winding section having opened end portions and a second winding section , and the first winding section is shaped in such a manner that a step in radial direction of a stator core is formed between opposing side sections and and the opened end sections are bent in the crossing over direction of the winding so that open ends and of the opened end sections oppose each other in the radial direction of the stator core , then the open ends and are connected by winding conductor pieces and of the second winding section to complete the unit winding , thereby, end sections of a stator winding are shortened and a small size dynamo electric machine is realized.

A linear shape straight angle line is transformed to form U-shape configuration in advance and by sandwiching a stator tooth portion to adjacent slots linear shape two sides are inserted and using a thin plate rod shape chip between both ends of U-shape side of the above stated coil is connected and then the coil is formed to have one winding close circuit. The plural coils are inserted and as stated in above between the both ends of an anti-U-shape side is connected, and a stator coil for forming a predetermined winding turn number is obtained. When an end face of the anti-U-shape side and the thin plate shape chip are overlapped and connected, a plate thickness of a portion in which they are overlapped is reduced by half respectively, and when they are overlapped, it becomes the plate thickness which corresponds to a plate thickness of the above stated straight angle line coil. A length of a coil end portion can be shortened widely.

Stator of rotating electric machine

The present invention provides a coil assembly comprising at least two end coil pieces having a U-shaped end and an open end, the open end comprising a first end and a second end, the second end having a terminal length greater than the first end, and at least one middle coil piece is provided stacked between the end coil pieces having a U-shaped end and an open end, the open end comprising third ends having a terminal length equal to the first end, and at least two intermediate coil pieces each being separately stacked between the end coil piece and the intermediate coil piece having a U-shaped end and an open end, the open end comprising fourth ends having a terminal length shorter than the first and third ends with the first and third ends being connected to an adjacent fourth end.

Stacked coil assembly for a stator

Growing community of inventors

Hitachinaka, Japan

Yasuhiko Kimura