JPS61124258A - Linear induction motor - Google Patents

Abstract

PURPOSE:To reduce irregular thrust by forming stator core toothed portion to match a magnetic flux distribution curve so that the longitudinal air gap between a stator and a movable element reduces the end effect, thereby decreasing the loss due to the end effect phenomenon. CONSTITUTION:In a linear induction motor in which a movable element 21 and a stator 11 are opposed through an air gap, the core toothed portion of the stator 11 is formed to vary an air gap length in each section. The state of the variation is decided so that the abrupt increase of decrease of a magnetic flux density at the end of the stator 11 is avoided and the magnetic flux density line for coupling the teeth tops is formed along a curve of a magnetic flux density distribution like a gradually increasing or decreasing curve. Thus, the irregular thrust in the stator longitudinal direction can be eliminated.

Description

【発明の詳細な説明】 産業上の利用分野 本発明はリニア誘導モータに関する。[Detailed description of the invention] Industrial applications The present invention relates to linear induction motors.

従来技術とその問題点 １１ニア誘導モータは％固定子と可動子が夫々有限長で
あるため両端部に端効果という現象が存在し、磁束の急
峻な変化が固定子と可動子との間に制動力全誘発し走行
特性の劣化を来すことｉＣなる。Prior art and its problems 11 In a near induction motor, the stator and mover each have a finite length, so there is a phenomenon called end effect at both ends, and a sharp change in magnetic flux occurs between the stator and mover. It becomes iC that full braking force is induced and driving characteristics deteriorate.

従来、前記磁束の急峻な変化を低減する手段として固定
子鉄心両端部のｒＤ磁コイルＣど磁性板でカバーさせる
とか、又は固定子鉄心両端部のＴＤ磁ココイル巻数？中
央部１ｍ比し減少させろものがある。Conventionally, as a means to reduce the sudden change in magnetic flux, the rD magnetic coil C at both ends of the stator core is covered with magnetic plates, or the number of turns of the TD magnetic coil at both ends of the stator core is reduced. There is something that needs to be reduced compared to the 1m central part.

しかしながら前者−ζ於ては、板厚が薄過ぎると磁束の
急峻な変化全低減することができず。However, in the case of the former -ζ, if the plate thickness is too thin, the sudden change in magnetic flux cannot be completely reduced.

板厚が厚過ぎると固定子鉄心歯部間の漏洩磁束が増大し
て推力を低下させること１ζなる。つまりこの板厚最適
値は推力と入力磁力６ｃ関係するが、速度制御全姿する
搬送装置に適用する場合。If the plate thickness is too thick, leakage magnetic flux between the teeth of the stator core will increase and the thrust will be reduced. In other words, this optimal plate thickness value is related to the thrust force and the input magnetic force 6c, but when applied to a conveyance device that fully controls the speed.

この板の最適厚の選定が惟しい。又前記磁性板に発生す
る渦電流換全低減させるため番ζ分割を要し、人手を要
する等の難点がある。The selection of the optimum thickness for this board was a problem. Further, in order to completely reduce the eddy current generated in the magnetic plate, it is necessary to divide the number ζ, which has the disadvantage of requiring manpower.

又後者に於ては１両端部に特殊コイル？要シ、量雀に際
し必ずしも有利とはならない。Also, in the latter case, is there a special coil at both ends? In short, it is not necessarily advantageous when playing mass sparrow.

本発明は以上の点に媚みてなされたもので。The present invention has been made in consideration of the above points.

端効果現象による損失を低減させるリニア誘導モータ？
提供すること？目的としている。A linear induction motor that reduces losses due to end effect phenomena?
What to offer? The purpose is

問題点の解決手段 本発明に係るリニア誘導モータは、固定子と可動子との
長手方向空隙を端効果を低減させるような分布の磁束分
布曲線に見合うよって固定子鉄心歯部高を形成せしめた
ものである。Means for Solving the Problems In the linear induction motor according to the present invention, the stator core tooth height is formed in such a manner that the longitudinal gap between the stator and the mover matches a magnetic flux distribution curve that reduces end effects. It is something.

ガ寵例 ｆｇ１図ｉａｌ　ｊ−１本発明番こ係る手板状片側式１
１ニア誘導モータの溝成説明図、ｌｂｌは要部拡大図で
ある。Favorite example fg1 Figure j-1 Hand plate-like one-sided type 1 according to the present invention
FIG. 1 is an explanatory diagram of the groove formation of a near induction motor, and lbl is an enlarged view of the main part.

図１ご於て、ｌは荷物を載置し、所定の区間全走行する
１送台直で、この今市ｌｔど具備した屯・愉２により走
行軌道８上全走行する。In FIG. 1, l is loaded with cargo and runs directly on a running track 8, using a truck equipped with this Imaichi lt, which runs the entire length of a predetermined section.

２１は前記撮送台直下面に固設されたリニア誘導モータ
の可動子で、アルミ板、銅板等号袂板（こ一体となした
ものである。Reference numeral 21 denotes a movable element of a linear induction motor fixedly installed directly below the photographing table, and is made of an aluminum plate, a copper plate, etc.

１１は前記可動子２１と所定の空隙を介して他上側ｌζ
固、役されたＩＪニア誘導モータの固定子で、屯気鉄板
に歯と溝を打ち抜いて遣層したもので、各ｃ４番ζはｒ
Ｄ磁ココイル巻込まれている。11 is connected to the other upper side lζ through a predetermined gap with the movable element 21.
This is a stator for an IJ near induction motor that has been used for a long time, and is made by punching teeth and grooves into a tonne iron plate.
It is wound with a D magnetic co-coil.

而しテｒＸ　！＊　２により前記空隙全保持するように
支持されている。So TerrX! *2 is supported so as to maintain the entire gap.

本発明に係る固定子の説明に先立ち、イ子来−につき述
べる。Prior to explaining the stator according to the present invention, a description will be given of the stator structure.

３２図は従来実用に供されている固定子１１の歯部と溝
部に於ける磁束密ｉ釦分布図で、矢印は１波界の進行方
向？示す。なぢ−４中ｇは空ｉ・改。Figure 32 is a magnetic flux density distribution diagram in the teeth and grooves of the stator 11 that has been put into practical use in the past, and the arrow indicates the traveling direction of one wave field. show. Naji-4 middle g is empty i/change.

ｕ、Ｖ、ＷはＴＤ磁ココイル符号のみ略記した。For u, V, and W, only the TD magnetic cocoil code is abbreviated.

図１ｒ於て空隙に於ける磁束密度Ｂは左端人口ｒｌ！１
１歯頂（１に於て、急Ｃど増加しついで該巾須毬中央に
於て磁束密度Ｂは若干減少するＪが、該歯頂部の終端【
２に於ては磁束密度Ｂが増加し【１罷と同じか又はそれ
より増加する。何れも洩ね１ダ束によるためであり、そ
の説明は省略する。In Figure 1r, the magnetic flux density B in the air gap is the leftmost population rl! 1
At the 1st tooth crest (1), the magnetic flux density B suddenly increases, and then the magnetic flux density B slightly decreases at the center of the crest.
In case 2, the magnetic flux density B increases and is the same as or more than 1 line. This is because all of them are based on one-da bundles, so the explanation thereof will be omitted.

ついで前記歯部に隣るｒｌｔ部中央に於て磁束密度Ｂは
減少するが隣接する歯頂Ｋｔｇに於ては再び急に増加し
、前記歯頂部ｔ２よりも増加する。Next, the magnetic flux density B decreases at the center of the rlt portion adjacent to the tooth portion, but rapidly increases again at the adjacent tooth crest Ktg, and increases more than the tooth crest portion t2.

（ｑ 以’Ｆ固定子＋１の入口端から中央部に回うＬこ従って
磁束密度Ｂは前記の如く凹凸を繰返しながら遂次増し中
央部に近づくζこ従って飽和するが。(q Since L turns from the inlet end of the F stator +1 to the center, the magnetic flux density B gradually increases while repeating the unevenness as described above, and as ζ approaches the center, it becomes saturated.

出口側に向っては、前記と反対に減少する。Toward the exit side, it decreases in the opposite way.

而して磁束密度Ｂと固と子の位１（との！月係Ｃま第２
図４こ示すように分布する。Therefore, the magnetic flux density B and the digit digit 1 (and!
The distribution is as shown in FIG.

再び本発明の説明に戻り、固定子１１（なお符号は従来
１１麦と同一とする）につき述べる。Returning to the description of the present invention, the stator 11 (the reference numerals are the same as those of the conventional stator 11) will be described.

本発明１こ係る固定子１１の歯頂部は端部Ｃど於る急増
減？さけ、各歯頂部？桔ぶ磁束密度の線が漸増（械）す
る曲線のような磁束密度分布面ｔＩ！ｒｒ沿うよう１ｒ
なしたものである。Present invention 1 Where does the tooth top of the stator 11 suddenly decrease at the end C? Salmon, the top of each tooth? The magnetic flux density distribution surface tI is like a curve in which the magnetic flux density line gradually increases! 1r along rr
This is what was done.

即ち固定子入口側から鉄心歯頂部（１，ｔＢ。That is, from the stator inlet side to the core tooth top (1, tB).

【５・・・が順次前記磁束密度分布曲線Ｃの・９上Ｓζ
合致するように夫々の固定子鉄心歯部高さ卆ｈ１　ｈ２
　ｈ８１１・・にど設定することにより、固定子鉄心歯
部と可動子２１との空隙ｇｌ。[5... is sequentially Sζ on ・9 of the magnetic flux density distribution curve C
Adjust the height of each stator core tooth part h1 h2 to match.
h811... By setting the gap gl between the stator core teeth and the movable element 21.

ｇ２．ｇ”・・・はｆａ束密度分布曲泉Ｃと同じとなる
。g2. g''... is the same as the fa flux density distribution curve C.

而して前述の如く固定子１１を［Ｒ成すると。Then, as described above, when the stator 11 is formed as [R].

ふ南部と可・防子間の空隙に於ける罐束斉；（Ｂは端）
′Ｊ６で、１５１ｒ増減することシこなり空隙磁束密・
丈が不均一、・涌庄することかなくなるので、固定子長
手方向＆Ｃ於ける推力の不均一を生ずるこ２−７＋＜　
ｆ：い。Kanzokusai in the gap between Funanbu and Kay/Boshi; (B is the edge)
'J6 increases or decreases 151r to increase or decrease the air gap magnetic flux density.
The length is uneven, and there is no bulging, resulting in uneven thrust in the longitudinal direction & C of the stator.2-7+<
f: Yes.

なセ前記説明に於て固定子を可助側に、０］−・’−ｈ
子を固定側に設けるものであってもよい。In the above explanation, if the stator is on the support side, 0]-・'-h
The child may be provided on the fixed side.

更ｔ（片側式に限らず両側式Ｉども・所用すること７）
シできるものである。Further (required for not only one-sided type but also double-sided type I)
It is something that can be done.

以上の説明では固定子１１の溝形状は叩、庁としである
が第８図のように半閉溝番ζしてもよい。In the above explanation, the groove shape of the stator 11 is a closed groove shape, but it may be a semi-closed groove shape as shown in FIG.

一般に誘導モータでは半閉溝の方？）ｉ空隙磁束分布の
均一化カイはかられｒこので、磁束密）９の＠散す な変化？押え石効果が増加する。同図のようｆｆ形状の
固定子鉄心はその形状の抜き金型を・（へｔｉすること
で容易Ｉこ得られる。Generally, induction motors have semi-closed grooves? )i The uniformity of the air gap magnetic flux distribution is calculated.r Therefore, the magnetic flux density) 9＠Do not dissipate the change? Increases the holding stone effect. As shown in the figure, an FF-shaped stator core can be easily obtained by cutting a punching die of that shape.

発明の効果 本発明によるときは、リニア誘導モータ覧υ喘部に腎る
空隙磁束密度変化を小さくなるよう（ｒｌｄ宅子歯詔寸
法を設定したＩ））で端効果１ごよる：、エツ禅？低減
することができ、ｊ与＋Ｃ高速搬１ム々・・ｆ力推力源
として吏用する局舎に衿て推力Ｕ）不拘−？著しく低減
しうる利点全ぼｆる。Effects of the Invention When the present invention is used, the air gap magnetic flux density change in the linear induction motor viewing section is reduced (I) by setting the dimensions of the rld. Can be reduced, j + C high-speed transport 1 m... f force connected to the station building used as a thrust source, thrust force U) independent -? All benefits can be significantly reduced.

【図面の簡単な説明】[Brief explanation of drawings]

’ｆｌｌｌｖｌｔａ＋は本発明の構成説明図で、同図ｔ
ｂｌはその′纏駆拡大図、第２１は従来機に於ける固定
子位・？τと空隙１呟束密・［１ｃＯＪ関係を示す説明
図、第８図は異りたる実施例図であるう ｌは搬送今市、　　２は曳輸、　　８は軌道、１１は固
定子、　　２１は可動子、 特許用・碩人　　　日立繍電工業株式会社−一７．”−
。 代　　理　　人　　　　池　　　１）　　万門生゛−ハ
；−０，・　ｌｊ 外　　１名 第１図 （ａ） ［ｉＩ☆を （ｂ）'flllvlta+ is a configuration explanatory diagram of the present invention;
BL is an enlarged view of the bundled drive, and No. 21 is the stator position in the conventional machine. An explanatory diagram showing the relationship between τ and air gap 1, bundle density, [1c OJ, Fig. 8 is a diagram of a different embodiment. is a movable element, for patent use, and for patent use. Hitachi Shuden Kogyo Co., Ltd. - 17. ”−
. Agent Ike 1) Manmon student゛-ha；-0,・lj 1 person Figure 1 (a) [iI☆(b)

Claims (1)

【特許請求の範囲】[Claims] 固定子と可動子よりなるリニア誘導モータに於て、固定
子全長に亘り所定の空隙によつて定まるところの、固定
子位置に対する該空隙の磁束密度分布曲線に基づき、夫
々の固定子歯頂が前記曲線に沿うように、固定子歯部を
構成せしめたことを特徴とするリニア誘導モータ。In a linear induction motor consisting of a stator and a mover, each stator tooth crest is determined by a predetermined gap over the entire length of the stator, based on the magnetic flux density distribution curve of the gap with respect to the stator position. A linear induction motor characterized in that a stator tooth portion is configured to follow the curve.