JP2011244671A - Split stator - Google Patents

Split stator Download PDF

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JP2011244671A
JP2011244671A JP2010117355A JP2010117355A JP2011244671A JP 2011244671 A JP2011244671 A JP 2011244671A JP 2010117355 A JP2010117355 A JP 2010117355A JP 2010117355 A JP2010117355 A JP 2010117355A JP 2011244671 A JP2011244671 A JP 2011244671A
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yoke
teeth
winding
electrical steel
split
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Narifumi Tojima
成文 遠嶋
Kazutaka Doke
和隆 道家
Yuji Maekawa
祐司 前川
Hiroyuki Taira
裕行 平
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IHI Corp
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IHI Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a split stator capable of enhancing motor output and manufacturing yields thereof.SOLUTION: A split stator is provided with a constitution that the split stator includes: a yoke section formed with a plurality of yoke pieces, which is annularly arranged and joined to one another; a plurality of teeth joined to a radially inner end of the yoke section; and windings wound around the plurality of teeth by a distributed winding method. Each of the plurality of yoke pieces is formed of non-oriented electrical steel sheets. Each of the plurality of teeth is formed of oriented electrical steel sheets having an easy axis of magnetization lying in the same direction as a flow direction of magnetic flux.

Description

本発明は、分割型ステータに関する。  The present invention relates to a split stator.

近年では、家電機器等に搭載される数ｋＷクラスのモータとして、集中巻き方式の埋込磁石同期モータ（ＩＰＭモータ）が多く採用されている。一方、数十ｋＷクラス以上の高出力ＩＰＭモータでは、集中巻き方式を採用した場合に、原理上、ステータの電流磁界に高調波成分が重畳し、磁石が埋め込まれているロータの渦電流が大きくなるという問題が生じることから、ステータの電流磁界に高調波成分が重畳しない分布巻き方式が採用される傾向にある。   In recent years, concentrated winding type synchronous magnet synchronous motors (IPM motors) are often used as motors of several kW class mounted on home appliances and the like. On the other hand, in a high-power IPM motor of several tens of kW class or more, when a concentrated winding method is adopted, in principle, harmonic components are superimposed on the current magnetic field of the stator, and the eddy current of the rotor in which the magnet is embedded is large. Therefore, a distributed winding method in which a harmonic component is not superimposed on the stator current magnetic field tends to be employed.

さらに、近年では、ＩＰＭモータに限らず、ステータコアを従来の一体型コアから分割型コアとすることで巻線占積率及びモータ効率の向上を図ることの可能な分割型ステータを採用することが主流となっている。例えば、下記特許文献１〜３には、ステータコアを円環状のヨーク部と複数のティース部とに分割し、さらにヨーク部を周方向に沿って複数のヨーク片に分割する構成を採用した分割型ステータが開示されている。   Further, in recent years, not only IPM motors but also split stators that can improve the winding space factor and motor efficiency by changing the stator core from a conventional integral core to a split core. It has become mainstream. For example, in Patent Documents 1 to 3 below, a split type in which the stator core is divided into an annular yoke portion and a plurality of teeth portions, and the yoke portion is further divided into a plurality of yoke pieces along the circumferential direction. A stator is disclosed.

特開平７−６７２７２号公報JP-A-7-67272 特開２００３−２７４５８３号公報JP 2003-274583 A 特開２００６−３２５２９６号公報JP 2006-325296 A

従来の分割型ステータとしては、上記特許文献１〜３に開示されているように、ヨーク部が複数のヨーク片に分割され、ヨーク部及びティース部の形成に方向性電磁鋼板を用いるタイプ（タイプ１）の他、ヨーク部が複数のヨーク片に分割され、ヨーク部の形成に方向性電磁鋼板を用い、ティース部の形成に無方向性電磁鋼板を用いるタイプ（タイプ２）や、ヨーク部は一体型であり、ヨーク部の形成に無方向性電磁鋼板を用い、ティース部の形成に方向性電磁鋼板を用いるタイプ（タイプ３）などが挙げられる。   As a conventional split-type stator, as disclosed in Patent Documents 1 to 3, a yoke part is divided into a plurality of yoke pieces, and a directional electromagnetic steel sheet is used to form the yoke part and the tooth part (type) In addition to 1), the yoke part is divided into a plurality of yoke pieces, a directional electromagnetic steel sheet is used for forming the yoke part, and a non-directional electromagnetic steel sheet is used for forming the tooth part (type 2), A type (type 3) in which a non-oriented electrical steel sheet is used for forming the yoke part and a directional electrical steel sheet is used for forming the tooth part is included.

上記タイプ１及びタイプ２の分割型ステータでは、ヨーク部の形成に方向性電磁鋼板を用いているため、ヨーク部とティース部との接合部付近における磁束の流れによっては磁気抵抗が大きくなり、モータ出力が低下するという問題がある。また、上記タイプ３の分割型ステータでは、ヨーク部を一体型とするため、製造歩留まりが悪いという問題がある。   In the type 1 and type 2 split type stators, a directional electromagnetic steel sheet is used to form the yoke portion. Therefore, the magnetic resistance increases depending on the flow of magnetic flux in the vicinity of the joint portion between the yoke portion and the tooth portion. There is a problem that the output decreases. Further, the type 3 split stator has a problem in that the manufacturing yield is poor because the yoke portion is integrated.

本発明は上述した事情に鑑みてなされたものであり、モータ出力及び製造歩留まりの向上を図ることの可能な分割型ステータを提供することを目的とする。  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a split-type stator capable of improving motor output and manufacturing yield.

上記課題を解決するために、本発明では、分割型ステータに係る解決手段として、複数のヨーク片が円環状に接合されてなるヨーク部と、前記ヨーク部の径方向内側に接合された複数のティース部と、前記ティース部に対して分布巻き方式で巻回された巻線とを備え、前記ヨーク片の各々は、無方向性電磁鋼板を用いて形成され、前記ティース部の各々は、磁束の流れ方向と一致する磁化容易方向を有する方向性電磁鋼板を用いて形成されていることを特徴とする。   In order to solve the above-described problem, in the present invention, as a solving means related to the split stator, a yoke part in which a plurality of yoke pieces are joined in an annular shape and a plurality of parts joined radially inward of the yoke part are provided. Each of the yoke pieces is formed using a non-oriented electrical steel sheet, and each of the tooth portions is formed of a magnetic flux. It is formed using a grain-oriented electrical steel sheet having an easy magnetization direction that coincides with the flow direction.

本発明に係る分割型ステータによれば、複数のヨーク片からなる分割型のヨーク部を用いるため、製造歩留まりの向上を図ることができると共に、各ヨーク片の形成に（つまりヨーク部の形成に）無方向性電磁鋼板を用いるため、ヨーク部（ヨーク片）とティース部との接合部の磁気抵抗を低減でき、モータ出力の向上を図ることができる。  According to the split stator according to the present invention, since the split yoke portion composed of a plurality of yoke pieces is used, the production yield can be improved, and each yoke piece can be formed (that is, the yoke portion can be formed). ) Since a non-oriented electrical steel sheet is used, the magnetic resistance at the joint between the yoke part (yoke piece) and the tooth part can be reduced, and the motor output can be improved.

本実施形態における分割型ステータ１の構成概略図である。1 is a schematic configuration diagram of a split stator 1 in the present embodiment. ティース部３からティース先端部３ａを分割し、このティース先端部３ａをティース部３に対して着脱自在とする構成を採用した変形例に関する説明図である。It is explanatory drawing regarding the modification which employ | adopted the structure which divides | segments the teeth front-end | tip part 3a from the teeth part 3, and makes this teeth front-end | tip part 3a detachable with respect to the teeth part 3. FIG. 巻きコア５を用いてヨーク部２を固定する構成を採用した変形例に関する説明図である。It is explanatory drawing regarding the modification which employ | adopted the structure which fixes the yoke part 2 using the winding core 5. FIG. ヨーク部２とティース部３との接合部６に形成された隙間に圧粉磁性材を含む接着剤７を充填する構成を採用した変形例に関する説明図である。It is explanatory drawing regarding the modification which employ | adopted the structure which fills the clearance gap formed in the junction part 6 of the yoke part 2 and the teeth part 3 with the adhesive agent 7 containing a dust magnetic material.

以下、図面を参照して、本発明の一実施形態について説明する。
図１は、本実施形態における分割型ステータ１の構成概略図である。本実施形態における分割型ステータ１は、巻線スロット数「１２」、極数「２」の分割型ステータであり、１２個のヨーク片２ａが円環状に接合されてなるヨーク部２と、このヨーク部２の径方向内側に接合（嵌合）された１２個のティース部３と、これらティース部３に対して分布巻き方式で巻回されたＵ相巻線４Ｕａ、４Ｕｂ、Ｖ相巻線４Ｖａ、４Ｖｂ、及びＷ相巻線４Ｗａ、４Ｗｂとから構成されている。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a split stator 1 according to this embodiment. The split stator 1 in this embodiment is a split stator having a winding slot number “12” and a pole number “2”, and a yoke portion 2 formed by joining 12 yoke pieces 2 a in an annular shape, Twelve teeth portions 3 joined (fitted) radially inside the yoke portion 2, and U-phase windings 4Ua, 4Ub, V-phase windings wound around the teeth portions 3 in a distributed winding manner 4Va, 4Vb, and W-phase windings 4Wa, 4Wb.

各ヨーク片２ａ及びティース部３は、珪素鋼等からなる電磁鋼板を積層することで独立に形成された分割コア部材であり、互いに組み合わされて１体のステータコアを形成するものである。本実施形態において、ヨーク片２ａの各々は、無方向性電磁鋼板を用いて形成され、また、ティース部３の各々は、磁束の流れ方向（図１中の符号Ｄ１）と一致する磁化容易方向（図１中の符号Ｄ２）を有する方向性電磁鋼板を用いて形成されている。   Each yoke piece 2a and teeth portion 3 are divided core members formed independently by laminating electromagnetic steel plates made of silicon steel or the like, and are combined with each other to form a single stator core. In the present embodiment, each of the yoke pieces 2a is formed by using a non-oriented electrical steel sheet, and each of the teeth portions 3 has an easy magnetization direction that coincides with the flow direction of magnetic flux (reference numeral D1 in FIG. 1). It is formed using a grain-oriented electrical steel sheet having (D2 in FIG. 1).

図１では、１つのヨーク片２ａに対して１つのティース部３が接合されている状態を図示しているが、１つのヨーク片２ａに対して複数のティース部３が接合される構成を採用しても良い。また、ヨーク片２ａ同士を溶接によって接合することでヨーク部２を形成しても良いし、或いは、ヨーク片２ａ同士を嵌合することでヨーク部２を形成しても良い。  FIG. 1 shows a state in which one tooth portion 3 is joined to one yoke piece 2a, but a configuration in which a plurality of tooth portions 3 are joined to one yoke piece 2a is adopted. You may do it. Moreover, the yoke part 2 may be formed by joining the yoke pieces 2a to each other by welding, or the yoke part 2 may be formed by fitting the yoke pieces 2a together.

図１に示すように、ヨーク部２の径方向内側に１２個のティース部３が一定間隔で嵌合されることで（言い換えれば、各ヨーク片２ａの径方向内側にティース部３が１対１で嵌合されることで）、隣り合うティース部３の間に計１２個の巻線スロットＳ１〜Ｓ１２が形成される。一方のＵ相巻線４Ｕａは、巻線スロットＳ１からＳ６までの間に配置された５個のティース部３を跨ぐように分布巻きされており、他方のＵ相巻線４Ｕｂは、巻線スロットＳ７からＳ１２までの間に配置された５個のティース部３を跨ぐように分布巻きされている。   As shown in FIG. 1, twelve teeth portions 3 are fitted at a constant interval on the radially inner side of the yoke portion 2 (in other words, a pair of teeth portions 3 is formed on the radially inner side of each yoke piece 2a. 1), a total of 12 winding slots S1 to S12 are formed between the adjacent tooth portions 3. One U-phase winding 4Ua is distributedly wound so as to straddle the five tooth portions 3 arranged between the winding slots S1 to S6, and the other U-phase winding 4Ub Distributed winding is performed so as to straddle the five tooth portions 3 arranged between S7 and S12.

また、一方のＶ相巻線４Ｖａは、巻線スロットＳ３からＳ８までの間に配置された５個のティース部３を跨ぐように分布巻きされており、他方のＶ相巻線４Ｖｂは、巻線スロットＳ９からＳ２までの間に配置された５個のティース部３を跨ぐように分布巻きされている。さらに、一方のＷ相巻線４Ｗａは、巻線スロットＳ５からＳ１０までの間に配置された５個のティース部３を跨ぐように分布巻きされており、他方のＷ相巻線４Ｗｂは、巻線スロットＳ１１からＳ４までの間に配置された５個のティース部３を跨ぐように分布巻きされている。   Further, one V-phase winding 4Va is distributedly wound so as to straddle the five teeth portions 3 arranged between the winding slots S3 to S8, and the other V-phase winding 4Vb is wound around Distributed winding is performed so as to straddle the five tooth portions 3 arranged between the line slots S9 to S2. Furthermore, one W-phase winding 4Wa is distributedly wound so as to straddle the five tooth portions 3 arranged between the winding slots S5 to S10, and the other W-phase winding 4Wb Distributed winding is performed so as to straddle the five tooth portions 3 arranged between the line slots S11 to S4.

以上のような構成を採用した本実施形態における分割型ステータ１によると、複数のヨーク片２ａからなる分割型のヨーク部２を用いるため、製造歩留まりの向上を図ることができると共に、各ヨーク片２ａの形成に（つまりヨーク部２の形成に）無方向性電磁鋼板を用いるため、ヨーク部２（ヨーク片２ａ）とティース部３との接合部の磁気抵抗を低減でき、モータ出力の向上を図ることができる。  According to the split type stator 1 in the present embodiment adopting the above-described configuration, since the split type yoke portion 2 composed of a plurality of yoke pieces 2a is used, the manufacturing yield can be improved, and each yoke piece can be improved. Since the non-oriented electrical steel sheet is used for forming 2a (that is, forming the yoke portion 2), the magnetic resistance of the joint portion between the yoke portion 2 (yoke piece 2a) and the tooth portion 3 can be reduced, and the motor output can be improved. Can be planned.

また、本実施形態における分割型ステータ１では、ステータコアを従来の一体型コアから分割型コアとすることで巻線占積率の向上を図ることができると共に、ティース部３の形成に磁束の流れ方向Ｄ１と一致する磁化容易方向Ｄ２を有する方向性電磁鋼板を用いているため、鉄損の低減を図ることができる。さらに、本実施形態における分割型ステータ１は、分布巻き方式を採用しているため、数十ｋＷクラス以上の高出力ＩＰＭモータ用のステータとして最適である。  Further, in the split stator 1 according to the present embodiment, the winding space factor can be improved by changing the stator core from the conventional integral core to the split core, and the flow of magnetic flux in the formation of the tooth portion 3 is achieved. Since the grain-oriented electrical steel sheet having the easy magnetization direction D2 that coincides with the direction D1 is used, iron loss can be reduced. Furthermore, the split stator 1 in the present embodiment employs a distributed winding method, and is optimal as a stator for a high-power IPM motor of several tens of kW class or higher.

なお、本発明は上記実施形態に限定されず、以下のような変形例が挙げられる。
（１）上記実施形態では、巻線スロット数「１２」、極数「２」の分割型ステータ１を例示して説明したが、これはあくまで一例であり、巻線スロット数（ティース部３の数）及び極数は分割型ステータ１に要求される仕様に応じて適宜変更可能である。また、ヨーク部２を構成するヨーク片２ａの数も１２個に限定されない。 In addition, this invention is not limited to the said embodiment, The following modifications are mentioned.
(1) In the above embodiment, the split stator 1 having the number of winding slots “12” and the number of poles “2” has been described as an example. However, this is merely an example, and the number of winding slots (the number of teeth 3) The number) and the number of poles can be appropriately changed according to the specifications required for the split stator 1. Further, the number of yoke pieces 2a constituting the yoke portion 2 is not limited to twelve.

（２）図２（ａ）（ｂ）に示すように、ティース部３からティース先端部３ａを分割し、このティース先端部３ａをティース部３に対して着脱自在な構成としても良い。この場合、ティース先端部３ａを外した状態でティース部３をヨーク部２に接合して、各巻線スロットＳ１〜Ｓ１２をオープンスロットとし（図２（ｂ）参照）、ティース部３に対して各Ｕ相巻線４Ｕａ、４Ｕｂ、Ｖ相巻線４Ｖａ、４Ｖｂ、及びＷ相巻線４Ｗａ、４Ｗｂの装着作業を行った後、ティース先端部３ａを各ティース部３に接合（嵌合）するという組み立て方法を採用することができ、巻線装着作業の容易化を図ることができる。なお、このティース先端部３ａの形成には、方向性電磁鋼板と無方向性電磁鋼板のいずれを用いても良い。 (2) As shown in FIGS. 2 (a) and 2 (b), the teeth tip 3 a may be divided from the teeth 3, and the teeth tip 3 a may be detachable from the teeth 3. In this case, the tooth portion 3 is joined to the yoke portion 2 with the teeth tip 3a removed, and the winding slots S1 to S12 are made open slots (see FIG. 2B). Assembly in which the teeth tip 3a is joined (fitted) to the teeth 3 after the U-phase windings 4Ua and 4Ub, the V-phase windings 4Va and 4Vb, and the W-phase windings 4Wa and 4Wb are mounted. The method can be employed, and the winding mounting operation can be facilitated. In addition, you may use any of a directional electrical steel plate and a non-oriented electrical steel plate for formation of this teeth front-end | tip part 3a.

（３）図３に示すように、無方向性電磁鋼板を螺旋状に巻いて積層構造とした巻きコア５の中空部に対して、ヨーク部２を圧入することにより、ヨーク部２の円環形状を維持したままヨーク部２を固定するような構成を採用しても良い。つまり、巻きコア５をヨーク部２（ヨーク片２ａ）の固定用部材として用いても良い。 (3) As shown in FIG. 3, the yoke portion 2 is press-fitted into the hollow portion of the wound core 5 in which a non-oriented electrical steel sheet is spirally wound to form a laminated structure. You may employ | adopt the structure which fixes the yoke part 2 with the shape maintained. That is, the winding core 5 may be used as a fixing member for the yoke portion 2 (yoke piece 2a).

（４）図４に示すように、ヨーク部２（ヨーク片２ａ）とティース部３との接合部６に数百μｍ程度の隙間（ギャップ）を形成しておき、このギャップに圧粉磁性材を含む接着剤７を充填することで、ヨーク部２とティース部３とを接着するようにしても良い。この圧粉磁性材とは、固体の磁性材を破砕及び圧粉して得られる粉末状の磁性材であり、粉末間の電気抵抗が大きく、渦電流損（鉄損）が小さいという特徴を有している。つまり、このような圧粉磁性材を含む接着剤７を接合部６に形成されたギャップに充填することで、ヨーク部２とティース部３との層間短絡を回避しつつ（層間短絡による渦電流発生を回避しつつ）、接合部６の磁気抵抗を下げることができ、その結果、モータ出力の低下及び鉄損の増大を回避することの可能な分割型ステータ１を得ることができる。 (4) As shown in FIG. 4, a gap (gap) of about several hundred μm is formed in the joint portion 6 between the yoke portion 2 (yoke piece 2 a) and the tooth portion 3, and a dust magnetic material is formed in this gap. The yoke part 2 and the teeth part 3 may be bonded together by filling the adhesive 7 containing This powder magnetic material is a powdered magnetic material obtained by crushing and compacting a solid magnetic material, and has the characteristics that the electrical resistance between the powders is large and the eddy current loss (iron loss) is small. is doing. That is, by filling the gap 7 formed in the joint 6 with the adhesive 7 containing such a dust magnetic material, while avoiding an interlayer short circuit between the yoke part 2 and the tooth part 3 (eddy current due to the interlayer short circuit) While avoiding the occurrence), it is possible to reduce the magnetic resistance of the joint 6, and as a result, it is possible to obtain the split stator 1 capable of avoiding a decrease in motor output and an increase in iron loss.

１…分割型ステータ、２…ヨーク部、２ａ…ヨーク片、３…ティース部、３ａ…ティース先端部、４Ｕａ、４Ｕｂ…Ｕ相巻線、４Ｖａ、４Ｖｂ…Ｖ相巻線、４Ｗａ、４Ｗｂ…Ｗ相巻線、５…巻きコア、６…接合部、７…接着剤、Ｓ１〜Ｓ１２…巻線スロット   DESCRIPTION OF SYMBOLS 1 ... Split-type stator, 2 ... Yoke part, 2a ... York piece, 3 ... Teeth part, 3a ... Teeth tip part, 4Ua, 4Ub ... U-phase winding, 4Va, 4Vb ... V-phase winding, 4Wa, 4Wb ... W Phase winding, 5 ... winding core, 6 ... joint, 7 ... adhesive, S1-S12 ... winding slot

Claims (1)

複数のヨーク片が円環状に接合されてなるヨーク部と、
前記ヨーク部の径方向内側に接合された複数のティース部と、
前記ティース部に対して分布巻き方式で巻回された巻線とを備え、
前記ヨーク片の各々は、無方向性電磁鋼板を用いて形成され、
前記ティース部の各々は、磁束の流れ方向と一致する磁化容易方向を有する方向性電磁鋼板を用いて形成されていることを特徴とする分割型ステータ。 A yoke part in which a plurality of yoke pieces are joined in an annular shape;
A plurality of teeth joined to the inside of the yoke in the radial direction;
A winding wound in a distributed winding manner on the teeth part,
Each of the yoke pieces is formed using a non-oriented electrical steel sheet,
Each of the teeth portions is formed using a grain-oriented electrical steel sheet having an easy magnetization direction that coincides with the flow direction of magnetic flux.
JP2010117355A 2010-05-21 2010-05-21 Split stator Pending JP2011244671A (en)

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JPWO2016088264A1 (en) * 2014-12-05 2017-04-27 三菱電機株式会社 Electric motor stator and method of manufacturing electric motor stator
JP2017143592A (en) * 2016-02-08 2017-08-17 三菱電機株式会社 Stator, rotary electric machine, and, manufacturing method of stator
CN107070008A (en) * 2016-12-15 2017-08-18 广东威灵电机制造有限公司 Stator and the motor with it
CN107370254A (en) * 2016-05-13 2017-11-21 王勇 Movable pole shoe list pitch electric machine
CN109155545A (en) * 2016-05-30 2019-01-04 三菱电机株式会社 Stator, motor, compressor and refrigerating air conditioning device
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CN111130231A (en) * 2018-10-30 2020-05-08 广东威灵电机制造有限公司 Motor stator and motor
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JP2020202618A (en) * 2019-06-06 2020-12-17 ヤマハモーターエレクトロニクス株式会社 Armature core and motor
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CN103683561A (en) * 2012-09-07 2014-03-26 上海三菱电梯有限公司 Stator of rotary motor
JPWO2016088264A1 (en) * 2014-12-05 2017-04-27 三菱電機株式会社 Electric motor stator and method of manufacturing electric motor stator
JP2017143592A (en) * 2016-02-08 2017-08-17 三菱電機株式会社 Stator, rotary electric machine, and, manufacturing method of stator
CN107370254A (en) * 2016-05-13 2017-11-21 王勇 Movable pole shoe list pitch electric machine
CN109155545B (en) * 2016-05-30 2020-07-28 三菱电机株式会社 Stator, motor, compressor and refrigeration air conditioner
CN109155545A (en) * 2016-05-30 2019-01-04 三菱电机株式会社 Stator, motor, compressor and refrigerating air conditioning device
CN107070008A (en) * 2016-12-15 2017-08-18 广东威灵电机制造有限公司 Stator and the motor with it
CN110649725A (en) * 2018-06-26 2020-01-03 中车株洲电力机车研究所有限公司 Block type iron core and motor
CN111130231A (en) * 2018-10-30 2020-05-08 广东威灵电机制造有限公司 Motor stator and motor
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JP2020078148A (en) * 2018-11-07 2020-05-21 株式会社ミツバ Rotor, motor and brushless wiper motor
CN109274235A (en) * 2018-11-23 2019-01-25 冶金自动化研究设计院 Double output shaft permanent magnet synchronous motor with high-power density
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JP7303030B2 (en) 2019-06-06 2023-07-04 ヤマハモーターエレクトロニクス株式会社 Armature core and motor
WO2021149753A1 (en) * 2020-01-24 2021-07-29 三菱重工業株式会社 Magnetic geared dynamo-electric machine, and method for manufacturing stator
CN113346646A (en) * 2021-06-11 2021-09-03 西北工业大学 Mixed silicon steel stator structure, rotor structure matched with same and permanent magnet motor with structure
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