JP2021078226A - Stator - Google Patents

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JP2021078226A
JP2021078226A JP2019203216A JP2019203216A JP2021078226A JP 2021078226 A JP2021078226 A JP 2021078226A JP 2019203216 A JP2019203216 A JP 2019203216A JP 2019203216 A JP2019203216 A JP 2019203216A JP 2021078226 A JP2021078226 A JP 2021078226A
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support member
slot
coil
stator
flow path
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JP7380099B2 (en
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尚人 越野
Naohito Etsuno
尚人 越野
信吾 長井
Shingo Nagai
信吾 長井
啓友 河西
Keisuke Kasai
啓友 河西
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Toyota Motor Corp
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Toyota Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

To provide a stator capable of suppressing more than before, stagnation, in a slot, of coolant liquid flowing into a porous body in the slot more.SOLUTION: A stator core 20 includes an annular yoke 22 and a plurality of teeth 24 that protrude inward in a radial direction from an inner peripheral surface of the yoke 22 and are provided at intervals in a circumferential direction. A coil 30 is wound around the teeth 24. A support member 50 is inserted into a slot 26 between the adjacent teeth 24, 24 to fill the gap in the slot 26. Further, the support member 50 includes a porous body. Resin molds 40, each of which is a covering member, cover both ends of the coil 30 and the support member 50 in an axial direction of the stator core. Further, the stator 10 is formed with at least one of: each first flow path 28 that penetrates from a bottom surface 26A of the slot 26 to an outer peripheral surface 22A of the yoke 22; and each second flow path 42 that penetrates from a contact surface 40A of the resin mold 40 contacting the support member 50 to a facing surface 40B thereof.SELECTED DRAWING: Figure 1

Description

本発明は、車両駆動用の回転電機（モータ）に用いられるステータの構造に関する。 The present invention relates to the structure of a stator used in a rotary electric machine (motor) for driving a vehicle.

ハイブリッド車両や電気自動車の駆動源として、回転電機が用いられる。回転電機の固定子であるステータは、環状のヨークと、ヨーク内周面から径方向中心に突出し、周方向に間隔を空けて設けられた複数のティースを備える。それぞれのティースにはコイルが巻回される。 A rotary electric machine is used as a drive source for hybrid vehicles and electric vehicles. The stator, which is a stator of a rotary electric machine, includes an annular yoke and a plurality of teeth that project radially from the inner peripheral surface of the yoke and are provided at intervals in the circumferential direction. A coil is wound around each tooth.

また、隣り合うティース間のスロットには、支持部材が挿入される。スロット内の空隙が支持部材によって埋められることで、ティースからのコイルの抜けが抑制される。 Further, a support member is inserted into a slot between adjacent teeth. By filling the gap in the slot with the support member, the coil is prevented from coming off from the tooth.

例えば特許文献１、２では、支持部材は多孔質体を含む。多孔質体はその内部にＡＴＦ（Ａｕｔｏｍａｔｉｃ Ｔｒａｎｓｍｉｓｓｉｏｎ Ｆｌｕｉｄ）等の冷却液が含浸可能となっており、これによりコイル及びステータコアの冷却が図られる。 For example, in Patent Documents 1 and 2, the support member includes a porous body. The inside of the porous body can be impregnated with a cooling liquid such as ATF (Automatic Transmission Fluid), whereby the coil and the stator core can be cooled.

特開２０１３−９４９９号公報Japanese Unexamined Patent Publication No. 2013-9499 特開２００６−３２０１７１号公報Japanese Unexamined Patent Publication No. 2006-32171

本明細書で開示されるステータは、多孔質体内に流れ込む冷却液の、スロット内での滞留を従来よりも抑制可能とすることを目的とする。 An object of the stator disclosed in the present specification is to make it possible to suppress the retention of the coolant flowing into the porous body in the slot as compared with the conventional case.

本明細書で開示されるステータは、ステータコア、コイル、支持部材、及び被覆部材を備える。ステータコアは、環状のヨークと、ヨークの内周面から半径方向内側に突出し周方向に間隔を空けて設けられる複数のティースを備える。コイルは、ティースの周囲に巻回される。支持部材は、隣り合うティース間のスロットに挿入されスロット内の空隙を埋める。またこの支持部材は多孔質体を含む。被覆部材は、コイル及び支持部材の、ステータコア軸方向の両端を覆う。またステータには、スロットの底面からヨークの外周面まで貫通する第一流路、及び、被覆部材の、支持部材との当接面からその対向面まで貫通する第二流路の少なくとも一方が形成される。 The stator disclosed herein includes a stator core, a coil, a support member, and a covering member. The stator core includes an annular yoke and a plurality of teeth protruding inward in the radial direction from the inner peripheral surface of the yoke and provided at intervals in the circumferential direction. The coil is wound around the teeth. The support member is inserted into a slot between adjacent teeth to fill the gap in the slot. Further, this support member includes a porous body. The covering member covers both ends of the coil and the support member in the axial direction of the stator core. Further, the stator is formed with at least one of a first flow path penetrating from the bottom surface of the slot to the outer peripheral surface of the yoke and a second flow path penetrating from the contact surface of the covering member with the support member to the facing surface thereof. To.

本明細書で開示されるステータによれば、多孔質体内に流れ込む冷却液が、第一流路及び第二流路の少なくとも一方からステータ外部に排出されるので、そのような流路が形成されていない従来のステータよりも、スロット内の冷却液の滞留を抑制可能となる。 According to the stator disclosed in the present specification, the coolant flowing into the porous body is discharged to the outside of the stator from at least one of the first flow path and the second flow path, so that such a flow path is formed. It is possible to suppress the retention of the coolant in the slot as compared with the conventional stator.

本実施形態に係るステータの外形を例示する斜視図である。It is a perspective view which illustrates the outer shape of the stator which concerns on this embodiment. ステータコアを例示する斜視図である。It is a perspective view which illustrates the stator core. ステータコアのティースに巻回されるコイルを例示する斜視図である。It is a perspective view which illustrates the coil wound around the tooth of a stator core. スロット内に挿入される支持部材を例示する斜視図である。It is a perspective view which illustrates the support member inserted into a slot. 図１のＡ−Ａ断面図である。FIG. 1 is a cross-sectional view taken along the line AA of FIG. 図５のＢ−Ｂ断面図である。FIG. 5 is a cross-sectional view taken along the line BB of FIG. コイルが分布巻きであるときの、Ａ−Ａ断面図である。FIG. 5 is a cross-sectional view taken along the line AA when the coil is a distributed winding.

以下、本実施形態に係るステータついて、図面を参照しながら説明する。図１を参照して、本実施形態に係るステータ１０は、回転電機の固定子であって、ステータコア２０、コイル３０（図３参照）、支持部材５０（図４参照）、及び被覆部材である樹脂モールド４０を含んで構成される。 Hereinafter, the stator according to the present embodiment will be described with reference to the drawings. With reference to FIG. 1, the stator 10 according to the present embodiment is a stator of a rotary electric machine, and is a stator core 20, a coil 30 (see FIG. 3), a support member 50 (see FIG. 4), and a covering member. It is configured to include a resin mold 40.

以下の説明においては、図１に示すように、ステータコア２０の環状部材であるヨーク２２（図２参照）の周方向を「ステータコア周方向」、ステータコア２０の半径方向を「ステータコア半径方向」、及びステータコア２０の厚さ方向を「ステータコア軸方向」という。 In the following description, as shown in FIG. 1, the circumferential direction of the yoke 22 (see FIG. 2), which is an annular member of the stator core 20, is the “stator core circumferential direction”, the radial direction of the stator core 20 is the “stator core radial direction”, and The thickness direction of the stator core 20 is referred to as "stator core axial direction".

図２を参照して、ステータコア２０は磁路を形成する磁気回路部材であって、例えば複数の電磁鋼板をステータコア軸方向に積層して製造される。または、磁性粉を加圧成形してステータコア２０を製造してもよい。 With reference to FIG. 2, the stator core 20 is a magnetic circuit member forming a magnetic path, and is manufactured by, for example, laminating a plurality of electromagnetic steel sheets in the stator core axial direction. Alternatively, the stator core 20 may be manufactured by pressure molding the magnetic powder.

ステータコア２０は、ヨーク２２及び複数のティース２４を備える。ヨーク２２は環状部材であり、ティース２４は、ヨーク２２の内周面から半径方向内側に突出する。さらにティース２４は、ステータコア周方向に間隔を空けて複数設けられる。隣り合うティース２４，２４間にスロット２６が形成される。 The stator core 20 includes a yoke 22 and a plurality of teeth 24. The yoke 22 is an annular member, and the teeth 24 project inward in the radial direction from the inner peripheral surface of the yoke 22. Further, a plurality of teeth 24 are provided at intervals in the circumferential direction of the stator core. A slot 26 is formed between the adjacent teeth 24 and 24.

さらにステータコア２０には、スロット２６の底面２６Ａ、言い換えるとヨーク２２の内周面から、ヨーク２２の外周面２２Ａまで貫通する第一流路２８が形成される。後述するように、第一流路２８は、スロット２６内に挿入された、多孔質体を含む支持部材５０（図４参照）に流れ込んだ冷却液をステータ１０の外部に排出するための排出口として機能する。 Further, the stator core 20 is formed with a first flow path 28 that penetrates from the bottom surface 26A of the slot 26, in other words, the inner peripheral surface of the yoke 22, to the outer peripheral surface 22A of the yoke 22. As will be described later, the first flow path 28 serves as a discharge port for discharging the cooling liquid that has flowed into the support member 50 (see FIG. 4) including the porous body inserted into the slot 26 to the outside of the stator 10. Function.

図２を参照して、第一流路２８は、スロット底面２６Ａの、ステータコア周方向幅Ａ１の中央部分に設けられてよい。後述するように、集中巻きのコイル３０が用いられる場合、図５に例示されるように、スロット２６内には、コイル３０，３０が隣り合って設けられる。またスロット２６内には、コイル３０，３０の間に、スロット２６の周方向中央部分の空隙を埋めるようにして、支持部材５０が挿入される。スロット底面２６Ａのステータコア周方向幅Ａ１の中央部分に第一流路２８が形成されることで、支持部材５０の径方向外側に第一流路２８が接続されることになり、支持部材５０内の冷却液がスムーズに第一流路２８に排出される。 With reference to FIG. 2, the first flow path 28 may be provided in the central portion of the bottom surface 26A of the slot with the circumferential width A1 of the stator core. As will be described later, when the centrally wound coil 30 is used, the coils 30 and 30 are provided adjacent to each other in the slot 26 as illustrated in FIG. Further, in the slot 26, the support member 50 is inserted between the coils 30 and 30 so as to fill the gap in the central portion of the slot 26 in the circumferential direction. By forming the first flow path 28 in the central portion of the stator core circumferential width A1 of the slot bottom surface 26A, the first flow path 28 is connected to the radial outer side of the support member 50, and the inside of the support member 50 is cooled. The liquid is smoothly discharged to the first flow path 28.

図４を参照して、コイル３０はティース２４の周囲に巻回される。コイル３０の巻回にはいくつかの方法があり、例えば図４では集中巻きの例が示される。集中巻きでは、予め四角筒状に巻回されたコイル３０がティース２４に差し込まれる。図４に例示されるように、スロット底面２６Ａとコイル３０との間に絶縁部材３４が挟み込まれてもよく、またティース２４の半径方向内側端部にコイル３０用の抜け止めリング３２が固定されてもよい。 With reference to FIG. 4, the coil 30 is wound around the teeth 24. There are several methods for winding the coil 30, for example, FIG. 4 shows an example of concentrated winding. In the concentrated winding, the coil 30 previously wound in a square cylinder shape is inserted into the teeth 24. As illustrated in FIG. 4, the insulating member 34 may be sandwiched between the slot bottom surface 26A and the coil 30, and the retaining ring 32 for the coil 30 is fixed to the radial inner end of the tooth 24. You may.

また図５を参照して、コイル３０は、導体であるコイル本体３１と、コイル本体３１の外周面を覆う絶縁被膜３３を備える。 Further, referring to FIG. 5, the coil 30 includes a coil main body 31 which is a conductor and an insulating coating 33 which covers the outer peripheral surface of the coil main body 31.

図５に例示されるように、集中巻きでは、一つのスロット２６に複数のコイル３０が配置される。ティース２４にコイル３０を差し込む際に、差し込み済みの隣のコイル３０との干渉を抑制するため、スロット２６内ではコイル３０，３０間に空隙が設けられる。この空隙が支持部材５０によって埋められる。 As illustrated in FIG. 5, in centralized winding, a plurality of coils 30 are arranged in one slot 26. When the coil 30 is inserted into the teeth 24, a gap is provided between the coils 30 and 30 in the slot 26 in order to suppress interference with the adjacent coil 30 that has already been inserted. This gap is filled with the support member 50.

図４及び図５を参照して、支持部材５０はスロット２６内に挿入される。例えばスロット２６内にすべてのコイル３０が差し込まれた後に、支持部材５０が挿入される。支持部材５０は例えば熱硬化性材料から構成され、ゲル状（粘性流体状）の支持部材５０がスロット２６内に挿入（充填）される。さらにこのステータの組立体を加熱処理することで支持部材５０が硬化する。 With reference to FIGS. 4 and 5, the support member 50 is inserted into the slot 26. For example, the support member 50 is inserted after all the coils 30 have been inserted into the slots 26. The support member 50 is made of, for example, a thermosetting material, and a gel-like (viscous fluid-like) support member 50 is inserted (filled) into the slot 26. Further, the support member 50 is cured by heat-treating the assembly of the stator.

支持部材５０は多孔質体を含む。例えば支持部材５０の全体が多孔質体から構成されてもよい。例えば加熱処理の過程で支持部材５０が発泡し、ステータコア径方向に沿って連通された連泡構造が形成される。後述するように、支持部材５０が多孔質体を含むことで、当該多孔質体に冷却液が入り込み、コイル３０及びステータコア２０が冷却される。 The support member 50 includes a porous body. For example, the entire support member 50 may be composed of a porous body. For example, in the process of heat treatment, the support member 50 foams to form a continuous foam structure in which the support member 50 communicates along the radial direction of the stator core. As will be described later, when the support member 50 contains the porous body, the cooling liquid enters the porous body, and the coil 30 and the stator core 20 are cooled.

支持部材５０によりスロット２６内の空隙が埋められることで、コイル３０のティース２４からの抜けが抑制される。なお、確実なコイル３０の固定のため、支持部材５０が接着性を備えていてもよい。 By filling the gap in the slot 26 with the support member 50, the coil 30 is suppressed from coming off from the teeth 24. The support member 50 may have adhesiveness in order to securely fix the coil 30.

図１を参照して、ステータコア２０、コイル３０及び支持部材５０を含むステータ組立体の、ステータコア軸方向両端に、被覆部材である樹脂モールド４０が形成される。樹脂モールド４０は、コイル３０のコイルエンド部分、つまり、コイル３０の、ステータコア軸方向両端部分及びこれに隣接する支持部材５０の同軸方向両端部分を覆う、環状部材である。 With reference to FIG. 1, resin molds 40, which are covering members, are formed at both ends of the stator assembly including the stator core 20, the coil 30, and the support member 50 in the axial direction of the stator core. The resin mold 40 is an annular member that covers the coil end portion of the coil 30, that is, both ends of the coil 30 in the axial direction of the stator core and both ends of the support member 50 adjacent thereto in the coaxial direction.

樹脂モールド４０が、コイル３０及び支持部材５０のステータコア軸方向両端部分、つまり、ステータコア２０よりもステータコア軸方向両端にはみ出した部分を覆うことで、当該はみ出し部分が周辺部材から保護される。例えば樹脂モールド４０はエポキシ樹脂またはワニスから構成されてよい。 The resin mold 40 covers both ends of the coil 30 and the support member 50 in the axial direction of the stator core, that is, the portions protruding from the stator core 20 to both ends in the axial direction of the stator core, so that the protruding portions are protected from the peripheral members. For example, the resin mold 40 may be made of epoxy resin or varnish.

樹脂モールド４０には第二流路４２が形成される。例えば硬化後の樹脂モールド４０に第二流路が穿孔される。図１、図６を参照して、第二流路４２は、支持部材５０との当接面４０Ａからその対向面４０Ｂまで貫通する。後述するように、支持部材５０に流れ込んだ冷却液は、第二流路４２からステータ１０の外部に排出される。 A second flow path 42 is formed in the resin mold 40. For example, a second flow path is perforated in the cured resin mold 40. With reference to FIGS. 1 and 6, the second flow path 42 penetrates from the contact surface 40A with the support member 50 to the facing surface 40B thereof. As will be described later, the coolant that has flowed into the support member 50 is discharged from the second flow path 42 to the outside of the stator 10.

図５、図６を参照して、図示しないロータの遠心力等により、ステータ１０の内周面に冷却液が供給される。冷却液は例えばＡＴＦ（Ａｕｔｏｍａｔｉｃ Ｔｒａｎｓｍｉｓｓｉｏｎ Ｆｌｕｉｄ）であってよい。ステータ１０の内周面に供給された冷却液は、図６の矢印に例示されるように、多孔質体を含む支持部材５０内に入り込む（含浸する）。これによってコイル３０及びステータコア２０が冷却される。 With reference to FIGS. 5 and 6, the coolant is supplied to the inner peripheral surface of the stator 10 by centrifugal force or the like of a rotor (not shown). The coolant may be, for example, ATF (Automatic Transmission Fluid). As illustrated by the arrow in FIG. 6, the coolant supplied to the inner peripheral surface of the stator 10 enters (impregnates) the support member 50 including the porous body. This cools the coil 30 and the stator core 20.

さらに支持部材５０内の冷却液は、第一流路２８及び第二流路４２からステータ１０の外部に排出され、新たな冷却液が支持部材５０内に入り込む。このように、支持部材５０内の冷却液が入れ替わることで、コイル３０及びステータコア２０が継続的に冷却される。 Further, the coolant in the support member 50 is discharged from the first flow path 28 and the second flow path 42 to the outside of the stator 10, and a new coolant enters the support member 50. By exchanging the cooling liquid in the support member 50 in this way, the coil 30 and the stator core 20 are continuously cooled.

＜他の実施形態＞
図１、図６では、ステータ１０に第一流路２８及び第二流路４２が形成されていたが、要するに支持部材５０に滞留する冷却液がステータ１０の外部に排出されればよいので、ステータ１０には、第一流路２８及び第二流路４２の少なくとも一方が形成されていればよい。 <Other Embodiments>
In FIGS. 1 and 6, the first flow path 28 and the second flow path 42 are formed in the stator 10, but in short, the coolant staying in the support member 50 may be discharged to the outside of the stator 10, so that the stator At least one of the first flow path 28 and the second flow path 42 may be formed in 10.

また、例えば図５では、集中巻きのコイル３０がティース２４に巻回されていたが、本実施形態に係るステータ１０はこの形態に限られない。例えば図７に例示されるように、分布巻きのコイル３０においても、第一流路２８及び第二流路４２（図示せず）を備えたステータ１０を構成可能である。 Further, for example, in FIG. 5, the centrally wound coil 30 is wound around the teeth 24, but the stator 10 according to the present embodiment is not limited to this embodiment. For example, as illustrated in FIG. 7, the distributed winding coil 30 can also be configured with a stator 10 having a first flow path 28 and a second flow path 42 (not shown).

なお、分布巻きにおいては、スロット２６には、コイル３０が一列のみティース２４に巻回される。このような場合において、ステータコア径方向に沿って最も外側のコイル３０が第一流路２８を塞がないような構造とすることが好適である。例えば、コイル３０の巻回に当たり、スロット２６の底面２６Ａとは離間するように、コイル３０がスロット２６内に配置される。さらにコイル３０とティース２４の間に、支持部材５０が挿入（充填）される。このようにすることで、支持部材５０を流路として、コイル３０とティース２４の間に冷却液が通過し、コイル３０及びティース２４の冷却が図られる。また冷却後の冷却液は第一流路２８及び第二流路４２からステータ１０外に排出される。 In the distributed winding, only one row of the coil 30 is wound around the teeth 24 in the slot 26. In such a case, it is preferable to have a structure in which the outermost coil 30 does not block the first flow path 28 along the stator core radial direction. For example, when winding the coil 30, the coil 30 is arranged in the slot 26 so as to be separated from the bottom surface 26A of the slot 26. Further, the support member 50 is inserted (filled) between the coil 30 and the teeth 24. By doing so, the cooling liquid passes between the coil 30 and the teeth 24 using the support member 50 as a flow path, and the coil 30 and the teeth 24 are cooled. Further, the cooling liquid after cooling is discharged to the outside of the stator 10 from the first flow path 28 and the second flow path 42.

１０ ステータ、２０ ステータコア、２２ ヨーク、２２Ａ ヨーク外周面、２４ ティース、２６ スロット、２６Ａ スロット底面、２８ 第一流路、３０ コイル、３１ コイル本体、３２ 抜け止めリング、３３ 絶縁被膜、３４ 絶縁部材、４０ 樹脂モールド（被覆部材）、４０Ａ 当接面、４０Ｂ 対向面、４２ 第二流路、５０ 支持部材。 10 stator, 20 stator core, 22 yoke, 22A yoke outer peripheral surface, 24 teeth, 26 slots, 26A slot bottom surface, 28 first flow path, 30 coils, 31 coil body, 32 retaining ring, 33 insulation coating, 34 insulation member, 40 Resin mold (covering member), 40A contact surface, 40B facing surface, 42 second flow path, 50 support member.

Claims (1)

環状のヨークと、前記ヨークの内周面から半径方向内側に突出し周方向に間隔を空けて設けられる複数のティースと、を備えるステータコアと、
前記ティースの周囲に巻回されたコイルと、
隣り合う前記ティース間のスロットに挿入され前記スロット内の空隙を埋める、多孔質体を含む支持部材と、
前記コイル及び前記支持部材の、ステータコア軸方向の両端を覆う被覆部材と、
を備え、
前記スロットの底面から前記ヨークの外周面まで貫通する第一流路、及び、前記被覆部材の、前記支持部材との当接面からその対向面まで貫通する第二流路の少なくとも一方が形成された、ステータ。
A stator core including an annular yoke and a plurality of teeth protruding inward in the radial direction from the inner peripheral surface of the yoke and provided at intervals in the circumferential direction.
A coil wound around the teeth and
A support member containing a porous body, which is inserted into a slot between adjacent teeth and fills a gap in the slot.
A covering member that covers both ends of the coil and the support member in the axial direction of the stator core, and
With
At least one of a first flow path penetrating from the bottom surface of the slot to the outer peripheral surface of the yoke and a second flow path of the covering member penetrating from the contact surface with the support member to the facing surface thereof was formed. , Stator.
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Citations (6)

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JP2003070199A (en) * 2001-08-27 2003-03-07 Hitachi Ltd Motor or dynamo and manufacturing method thereof
JP2004297924A (en) * 2003-03-27 2004-10-21 Nissan Motor Co Ltd Cooling structure of rotary electric machine
JP2006320171A (en) * 2005-05-16 2006-11-24 Toshiba Corp Method and device for fixing and supporting coil in electric rotating machine
JP2011167045A (en) * 2010-02-15 2011-08-25 Nsk Ltd Motor cooling structure and in-wheel motor
JP2012186880A (en) * 2011-03-03 2012-09-27 Hitachi Constr Mach Co Ltd Rotary electric machine provided with cooling structure and construction machine using rotary electric machine
JP2019009866A (en) * 2017-06-21 2019-01-17 トヨタ自動車株式会社 Rotor of rotary electric machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003070199A (en) * 2001-08-27 2003-03-07 Hitachi Ltd Motor or dynamo and manufacturing method thereof
JP2004297924A (en) * 2003-03-27 2004-10-21 Nissan Motor Co Ltd Cooling structure of rotary electric machine
JP2006320171A (en) * 2005-05-16 2006-11-24 Toshiba Corp Method and device for fixing and supporting coil in electric rotating machine
JP2011167045A (en) * 2010-02-15 2011-08-25 Nsk Ltd Motor cooling structure and in-wheel motor
JP2012186880A (en) * 2011-03-03 2012-09-27 Hitachi Constr Mach Co Ltd Rotary electric machine provided with cooling structure and construction machine using rotary electric machine
JP2019009866A (en) * 2017-06-21 2019-01-17 トヨタ自動車株式会社 Rotor of rotary electric machine

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