JPH11341785A - Permanent magnet arrangement structure for linear motor, and its arranging method - Google Patents
Permanent magnet arrangement structure for linear motor, and its arranging methodInfo
- Publication number
- JPH11341785A JPH11341785A JP14413398A JP14413398A JPH11341785A JP H11341785 A JPH11341785 A JP H11341785A JP 14413398 A JP14413398 A JP 14413398A JP 14413398 A JP14413398 A JP 14413398A JP H11341785 A JPH11341785 A JP H11341785A
- Authority
- JP
- Japan
- Prior art keywords
- arrangement
- permanent magnet
- linear motor
- permanent magnets
- thrust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば自動織機の
開口装置の駆動装置として利用するリニアモータの主要
構成部である界磁構造において、そこでの永久磁石の配
置構造およびその配置方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement structure of permanent magnets in a field structure which is a main component of a linear motor used as, for example, a driving device of an opening device of an automatic loom, and a method of arranging the permanent magnets therein.
【０００２】[0002]
【従来の技術】図５は、可動子側に永久磁石５を、固定
子側に界磁コイル３を備えた場合のリニアモータの界磁
構造１を示す断面図である。この図における固定子側の
構成としては、外殻構造としてのフレームを形成するバ
ックヨーク２が２面対向した配置にあり、その両内側面
上の同位置・同ピッチで界磁コイル３および界磁コア４
が配置する構成となる。2. Description of the Related Art FIG. 5 is a sectional view showing a field structure 1 of a linear motor in which a permanent magnet 5 is provided on a mover side and a field coil 3 is provided on a stator side. As a configuration on the stator side in this figure, a back yoke 2 forming a frame as an outer shell structure is arranged so as to face two surfaces, and the field coil 3 and the field coil are arranged at the same position and pitch on both inner side surfaces. Magnetic core 4
Is arranged.
【０００３】そして可動子側は対向する界磁コイル３間
に一定幅Ｗの永久磁石５を一定のピッチ（以下ポールピ
ッチＰｐという）で、また側方の界磁コイル３に向けて
の磁極方向を交互に配置する構成となる。[0003] On the mover side, permanent magnets 5 having a constant width W are arranged at a constant pitch (hereinafter referred to as a pole pitch Pp) between the opposing field coils 3 and in the direction of the magnetic pole toward the side field coils 3. Are alternately arranged.
【０００４】同図において、補助線Ｌ、Ｌ’は固定子側
バックヨーク２内側面上に隣り合って並設する２つの界
磁コイル３のそれぞれの中心線であり、その間の距離Ｐ
ｃは配置ピッチ間隔を意味し、そして従来よりポールピ
ッチＰｐについてはその側位置に設置されている界磁コ
イル３の配置ピッチの４分の３のピッチ長に設定されて
いた。In FIG. 1, auxiliary lines L and L ′ are the center lines of two field coils 3 arranged side by side on the inner surface of the back yoke 2 on the stator side, and the distance P between them is shown.
c means the arrangement pitch interval, and the pole pitch Pp has conventionally been set to a pitch length of three quarters of the arrangement pitch of the field coils 3 installed at the side positions.
【０００５】しかし、このポールピッチＰｐ中における
永久磁石５の配置占有比（磁石幅Ｗ／ポールピッチＰ
ｐ）については従来より特定の比率値で設定されるもの
ではなかった。However, the occupation ratio of the permanent magnet 5 in the pole pitch Pp (magnet width W / pole pitch Pp)
Regarding p), conventionally, a specific ratio value has not been set.
【０００６】[0006]
【発明が解決しようとする課題】そして上記の構成にあ
るリニアモータ界磁構造１においては、作動中界磁コイ
ル３や永久磁石５の並設方向に推力・制動力が発生する
以外にも、同時に可動子上の永久磁石５と、バックヨー
ク２側面上に一体に設置する界磁コア４との間、および
バックヨーク２自体との間において大きな吸引力が発生
するものとなる。In the linear motor field structure 1 having the above-described structure, a thrust / braking force is generated in the direction in which the field coil 3 and the permanent magnet 5 are juxtaposed during operation. At the same time, a large attractive force is generated between the permanent magnet 5 on the mover, the field core 4 integrally provided on the side surface of the back yoke 2, and the back yoke 2 itself.
【０００７】また、ある一つのリニアモータの性能に関
与する設計要素（パラメータ）が多数存在する内、可動
子の推力・制動力の増減に関与するものとしては、永久
磁石５の磁束密度や界磁コイル３に流す励磁電流等があ
るが、これらは推力と比例関係にあると同時に前記吸引
力に対しても線形の関係にあり、よって同じ変化率で増
減するものとなっていた。Further, among the many design elements (parameters) involved in the performance of a certain linear motor, the factors involved in increasing or decreasing the thrust and braking force of the mover include the magnetic flux density of the permanent magnet 5 and the field. There are exciting currents and the like flowing through the magnetic coil 3, which are proportional to the thrust and also linear to the attraction, and thus increase and decrease at the same rate of change.
【０００８】そのため推力・制動力の向上を目的として
前記２つのパラメータをそれぞれ大きく設定した場合、
同時に吸引力も比例して増大するため、可動子に向けて
界磁コイル３を設置する構造部材のバックヨーク２が吸
引方向に撓み、その結果固定子側の界磁コイル３と、高
速で往復運動する可動子側の永久磁石５とが接触して大
きな損傷を招くといった問題があった。Therefore, when the above two parameters are set to be large for the purpose of improving the thrust and the braking force,
At the same time, the attraction force also increases in proportion, so that the back yoke 2 of the structural member for installing the field coil 3 toward the mover bends in the attraction direction, and as a result, reciprocates with the field coil 3 on the stator side at high speed. There is a problem that the permanent magnets 5 on the movable element side contact with each other cause serious damage.
【０００９】そこで従来よりバックヨーク２の強度・剛
性を維持するために多数の補強部材を使用した構成とし
たため、界磁コイル３の周囲およびバックヨーク２の構
成が複雑化し、またリニアモータ全体の大容積化および
大重量化をも招く結果となっていた。In view of the above, conventionally, a large number of reinforcing members are used to maintain the strength and rigidity of the back yoke 2, so that the configuration around the field coil 3 and the back yoke 2 is complicated, and the entire linear motor is As a result, the volume and the weight are increased.
【００１０】また一方、永久磁石５自体は重量部材であ
るため、例えば上記可動子側に設置する場合には高速往
復運動を行う上でその慣性に問題があり、また製造コス
トも高いものであるため永久磁石はその使用量を最小限
に押さえる、つまり前述の配置占有比をできるだけ低く
設定することが望まれていた。On the other hand, since the permanent magnet 5 itself is a heavy member, when it is installed on the mover side, for example, there is a problem in its inertia in performing a high-speed reciprocating motion, and the manufacturing cost is high. Therefore, it has been desired that the amount of the permanent magnet used is minimized, that is, the above-described arrangement ratio is set as low as possible.
【００１１】そして前述したパラメータ、特に永久磁石
５の配置に関するものについては、概ね推力・制動力の
向上のみに対して製造者側の経験則に基づいた設定でし
かなく、同時に発生する吸引力の弊害に対しては考慮さ
れるものではなかった。The above-mentioned parameters, particularly those relating to the arrangement of the permanent magnets 5, are generally set only based on the manufacturer's empirical rule for improving the thrust and braking force only. The evil was not taken into account.
【００１２】そこで本発明は以上の問題点に鑑み、永久
磁石の配置占有比の設定により推力の低下を押さえつつ
吸引力のみを減少させることが可能となる特性を利用す
ることでリニアモータ全体の小型・軽量化、高信頼性
化、低コスト化を可能とする永久磁石の配置方法と、そ
れによるリニアモータの永久磁石配置構造の提供を課題
とするIn view of the above problems, the present invention utilizes the characteristic that the attraction force can be reduced while suppressing the reduction in thrust by setting the occupation ratio of the permanent magnets. It is an object of the present invention to provide a method for arranging permanent magnets that can be reduced in size, weight, reliability, and cost, and to provide a permanent magnet arranging structure for a linear motor.
【００１３】[0013]
【課題を解決するための手段】先ず今回、本発明者が上
記リニアモータに関する問題点を解決するに当たって、
永久磁石の配置占有比の変化に伴う推力と吸引力の増減
について実験・検証したところ図１に示すような非相似
特性があることを発見した。Means for Solving the Problems First of all, the present inventor has solved the above-mentioned problems relating to the linear motor.
Experiments and verifications on the increase and decrease of the thrust and the attractive force due to the change in the occupation ratio of the permanent magnets revealed that there were non-similar characteristics as shown in FIG.
【００１４】この図によれば、まずはじめに永久磁石の
配置占有比の初期値を１（この場合永久磁石がその配置
列中に一定幅で磁極方向を交互に隙間なく連続して配置
する構成となる）として順次減少させて設定するに伴
い、固定子側にかかる吸引力はほぼ正比例的に減少する
のに対し、可動子側にかかる静推力は配置占有比が０．
６以下に減少設定するまでほぼ低下が見られず、２つの
作用力の間には減少比に差分が生じる特性があることが
判明する。According to this figure, first, the initial value of the arrangement occupancy ratio of the permanent magnets is set to 1 (in this case, the permanent magnets are arranged continuously in the arrangement row in a fixed width alternately in the magnetic pole direction without a gap. ), The suction force applied to the stator side decreases almost directly proportionally, while the static thrust applied to the mover side has an arrangement occupancy ratio of 0.
It is clear that there is almost no decrease until the reduction is set to 6 or less, and it is found that there is a characteristic that a difference occurs in the reduction ratio between the two acting forces.
【００１５】ここで静推力とは静止させた状態の可動子
に加わる推力のことでリニアモータの実作動に直接関係
する動推力とは比例関係にあり、また静推力と吸引力は
永久磁石の磁極位置と界磁コイルとの位置関係により周
期的に変化するものであるため図のグラフ上ではその平
均値のさらに正規化した値をプロットしたものとなる。Here, the static thrust is a thrust applied to the movable element in a stationary state, and is proportional to the dynamic thrust directly related to the actual operation of the linear motor. Since the value periodically changes depending on the positional relationship between the magnetic pole position and the field coil, a graph obtained by plotting a further normalized value of the average value is plotted on the graph in FIG.
【００１６】以上の特性は、リニアモータ界磁構造の構
成上、永久磁石全体が推力に寄与するものでなく、個々
の永久磁石の部分箇所によって推力に寄与する度合いが
異なることによるものである。具体的には磁極方向を交
互に隙間なく連続して配置した場合の永久磁石列におい
て、隣合う２つの永久磁石の境目付近の箇所が推力の発
生にあまり寄与していないことによるものである。The above characteristics are due to the fact that the entire permanent magnet does not contribute to the thrust due to the configuration of the linear motor field structure, but the degree of contribution to the thrust varies depending on the location of each permanent magnet. Specifically, in the permanent magnet array in which the magnetic pole directions are arranged alternately and continuously without a gap, the portion near the boundary between two adjacent permanent magnets does not contribute much to the generation of thrust.
【００１７】そこで本発明は課題を解決するためにこの
特性を利用して以下のように構成する。Therefore, the present invention is configured as follows using this characteristic in order to solve the problem.
【００１８】まずリニアモータの界磁構造に永久磁石を
配置する方法に適用するものとなり、定ピッチ間隔の永
久磁石配置列中における永久磁石の配置占有比と推力及
び吸引力との関係（例えば図１に示されるような関係）
を測定し、その測定結果に基づき、該推力をほぼそのま
まに維持しながら該吸引力のみを減少させ得る範囲内に
前記配置占有比を設定し、それに従って永久磁石を配置
する方法となる。First, the present invention is applied to a method of arranging permanent magnets in the field structure of a linear motor. The relationship between the occupation ratio of the permanent magnets in a row of permanent magnets arranged at a constant pitch and the thrust and attractive force (see FIG. 1)
Is measured, and based on the measurement result, the arrangement occupation ratio is set within a range where only the attraction force can be reduced while maintaining the thrust substantially as it is, and the permanent magnet is arranged in accordance therewith.
【００１９】これにより、リニアモータ全体の小型・軽
量化、高信頼性化、低コスト化を実現できる永久磁石の
配置が可能となる。As a result, it is possible to arrange permanent magnets which can realize a reduction in size, weight, reliability and cost of the entire linear motor.
【００２０】また特に前記配置占有比が１である場合の
それぞれの値に対する割合において、前記推力が０．９
５以上であり、かつ前記吸引力が０．９以下となる範囲
に該配置占有比を設定することが望ましい。この範囲
は、永久磁石の配置ピッチ長が界磁コイルの配置ピッチ
長の４分の３の長さの場合に測定された図１の関係にお
いては、配置占有比がほぼ０．６以上０．８以下の場合
に相当する。In particular, when the arrangement occupancy ratio is 1, the thrust is 0.9
It is desirable to set the arrangement occupancy ratio in a range that is 5 or more and the suction force is 0.9 or less. According to the relationship in FIG. 1 measured when the arrangement pitch length of the permanent magnets is three quarters of the arrangement pitch length of the field coils, the arrangement occupancy ratio is approximately 0.6 or more and 0. 8 or less.
【００２１】また特に前記永久磁石の配置ピッチ長を界
磁コイルの配置ピッチ長の４分の３の長さとし、前記配
置占有比を０．６以上０．８以下の範囲に設定し、それ
に従って永久磁石を配置する方法となる。In particular, the arrangement pitch length of the permanent magnets is set to three quarters of the arrangement pitch length of the field coils, and the arrangement occupancy ratio is set in a range of 0.6 or more and 0.8 or less. This is a method of arranging permanent magnets.
【００２２】これにより、特に上記の吸引力低減特性を
有効に利用した永久磁石の配置方法となる。Thus, the method of arranging the permanent magnets particularly makes effective use of the above-described attractive force reducing characteristics.
【００２３】またリニアモータの永久磁石配置構造自体
に関して、前記定ピッチ間隔の永久磁石配列中における
永久磁石の配置占有比と推力及び吸引力との関係に基づ
き、該推力をほぼそのままに維持しながら該吸引力のみ
を減少させ得る範囲内に該配置占有比を設定した構成と
なる。Further, regarding the permanent magnet arrangement structure itself of the linear motor, based on the relationship between the arrangement occupancy ratio of the permanent magnets in the arrangement of the permanent magnets at the constant pitch interval and the thrust and the attraction, the thrust is maintained almost as it is. The arrangement occupancy ratio is set within a range where only the suction force can be reduced.
【００２４】そして特に前記配置占有比が１である場合
のそれぞれの値に対する割合において、前記推力が０．
９５以上であり、かつ前記吸引力が０．９以下となる範
囲に設定した構成となることが望ましい。この範囲は、
上記と同様、永久磁石の配置ピッチ長が界磁コイルの配
置ピッチ長の４分の３の長さの場合に測定された図１の
関係においては、配置占有比がほぼ０．６以上０．８以
下の場合に相当する。In particular, when the arrangement occupancy ratio is 1, the thrust is 0.1% in the ratio to each value.
It is desirable that the suction force is not less than 95 and the suction force is not more than 0.9. This range is
Similar to the above, in the relationship of FIG. 1 measured when the arrangement pitch length of the permanent magnets is three-fourths of the arrangement pitch length of the field coils, the arrangement occupancy ratio is approximately 0.6 or more. 8 or less.
【００２５】また特に前記永久磁石の配置ピッチ長が界
磁コイルの配置ピッチ長の４分の３の長さであり、前記
配置占有比が０．６以上０．８以下の範囲に設定した構
成となる。In particular, the arrangement pitch length of the permanent magnet is three quarters of the arrangement pitch length of the field coil, and the arrangement occupancy ratio is set in the range of 0.6 to 0.8. Becomes
【００２６】これにより、特に上記の吸引力低減特性を
有効に利用した構成の界磁構造となる。As a result, a field structure having a structure that effectively utilizes the above-described attractive force reducing characteristics is obtained.
【００２７】[0027]
【発明の実施の形態】以下、本発明の実施の形態を図を
参照しながら説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００２８】先ず図２は、本発明の実施の形態にあるリ
ニアモータ界磁構造の断面図である。 この図におい
て、リニアモータ界磁構造１１は可動子側に永久磁石１
５を、固定子側に界磁コイル１３を備えた構成となる。FIG. 2 is a sectional view of a linear motor field structure according to an embodiment of the present invention. In this figure, the linear motor field structure 11 has a permanent magnet 1
5 is provided with a field coil 13 on the stator side.
【００２９】固定子側の構成としては外殻構造としての
フレームを形成するバックヨーク１２が２面対向した配
置にあり、その両内側面上の同位置・同ピッチで界磁コ
イル１３および軟鉄製の界磁コア１４が配置する構成と
なる。As a configuration on the stator side, a back yoke 12 forming a frame as an outer shell structure is disposed so as to face two surfaces, and a field coil 13 and a soft iron are formed at the same position and the same pitch on both inner surfaces thereof. Field cores 14 are arranged.
【００３０】また可動子側は、対向する界磁コイル１３
間に一定幅の永久磁石１５を一定の配置ピッチで、また
側方の界磁コイル１３に向けての磁極方向を交互に配置
する構成となる。On the mover side, the opposing field coils 13
In this configuration, the permanent magnets 15 having a fixed width are arranged at a fixed arrangement pitch and the magnetic pole directions toward the side field coils 13 are alternately arranged.
【００３１】同図において、補助線Ｌ、Ｌ’は固定子側
のバックヨーク１２内側面上に隣り合って並設する２つ
の界磁コイル１３（界磁コア１４）のそれぞれの中心線
であり、その間の距離Ｐｃは配置ピッチを意味する。In the figure, auxiliary lines L and L 'are the center lines of two field coils 13 (field cores 14) arranged side by side on the inner surface of the back yoke 12 on the stator side. , The distance Pc between them means the arrangement pitch.
【００３２】またＰｐは可動子側に設置する永久磁石１
５のポールピッチを意味し、該界磁コイル１３の配置ピ
ッチＰｃの４分の３の長さにあり、さらにＷはその配置
列中における永久磁石１５自体の長さを意味するものと
なり、すなわちその比率Ｗ／Ｐｐが配置列中における永
久磁石１５の配置占有比となる。Pp is a permanent magnet 1 installed on the mover side.
5, the pole pitch of the field coil 13 is three quarters of the arrangement pitch Pc of the field coil 13, and W is the length of the permanent magnet 15 itself in the arrangement row. The ratio W / Pp is an arrangement occupancy ratio of the permanent magnets 15 in the arrangement row.
【００３３】従って該配置占有比が１（Ｗ／Ｐｐ＝１）
の場合とは、可動子側の永久磁石配置列中において磁極
を交互に配置する永久磁石１５それぞれの長さＷがＰｐ
と同じ（Ｗ＝Ｐ）にあり、隙間なく連続して配置される
構成を意味するものとなる。Therefore, the arrangement occupancy ratio is 1 (W / Pp = 1).
The length W of each of the permanent magnets 15 in which the magnetic poles are alternately arranged in the permanent magnet arrangement row on the mover side is Pp
(W = P), and means a configuration in which they are continuously arranged without any gap.
【００３４】そして本実施形態において最も特徴とする
点は、従来固定子側に配置する永久磁石１５の配置占有
比が特定されていなかったところ０．６５という明確な
値に一律に設定することにより最も有効な形態として永
久磁石を配置した点にある。The most characteristic point of the present embodiment is that the arrangement ratio of the permanent magnets 15 arranged on the stator side has not been specified in the past, but was set uniformly to a clear value of 0.65. The most effective mode is that a permanent magnet is arranged.
【００３５】このことは、図１を参照して配置占有比を
例えば（従来の製造者側の経験則に基づいて設定されて
いた値としての）０．８に設定した場合と比較して、静
推力はほぼ元の値を維持してほとんど変化が見られない
一方、吸引力は約０．８６から約０．６８までのおよそ
０．１８（１８％）近くの減少差を有することになる。This means that as compared with the case where the arrangement occupancy ratio is set to, for example, 0.8 (as a value set based on the conventional rule of thumb of the manufacturer) with reference to FIG. The static thrust remains almost unchanged and hardly changes, while the suction force has a reduction difference of about 0.86 to about 0.68, which is about 0.18 (18%). .
【００３６】この差は可動子の動きに大きな駆動力、高
速往復動、急起動・急制動などの高い運動性能を要求す
る大型の装置などへの利用に対しては本実施形態におけ
るバックヨーク２のような構造体に対してかなり大きな
負担軽減の効果をもたらし、また同時に可動子側に配置
する永久磁石１５の使用量に関しても配置占有比で０．
１５の削減（従来多くの場合に設定されていた上記０．
８の例と比較して約１９％の削減）が可能となることで
大幅な軽量化および製造コストの削減が可能となる。This difference is caused by the use of the back yoke 2 according to the present embodiment for use in a large-sized device that requires a high driving performance such as a large driving force, a high-speed reciprocating motion, a sudden start / rapid braking, etc. The structure described above has a considerably large load-reducing effect, and at the same time, the amount of use of the permanent magnets 15 arranged on the mover side is reduced by an occupation ratio of 0.
15 (the above-described 0.1.
8 can be reduced by about 19% (compared to the example of FIG. 8), so that the weight and the manufacturing cost can be significantly reduced.
【００３７】そして図１に示す特性に基づくと配置占有
比を０．６５より小さく設定した場合には静推力・吸引
力共に同時に比例して低下するため、本実施形態におけ
る永久磁石１５の配置方法としてはこの０．６５を最小
値として配置占有比を設定し、それに基づいて永久磁石
１５を配置する方法となる。Based on the characteristics shown in FIG. 1, when the arrangement occupancy ratio is set to be smaller than 0.65, both the static thrust and the attraction force decrease in proportion to each other. In this method, the arrangement occupation ratio is set with 0.65 as a minimum value, and the permanent magnet 15 is arranged based on the arrangement occupation ratio.
【００３８】しかし、図１に示したような特性（配置占
有比と推力及び吸引力との関係）は、リニアモータ全体
の構造や永久磁石の材質等により多少異なるものである
ため、各構造や材質毎に特性を測定し、その測定結果に
基づき所望の範囲内に配置占有比を設定することが望ま
れる。そして、そのような配置占有比は、この配置占有
比が１である場合と比べた割合が推力で０．９５以上か
つ吸引力で０．９以下となる範囲に設定することが望ま
しい。これに基づけば、図１の関係においては、配置占
有比がほぼ０．６〜０．８の範囲となる。However, the characteristics as shown in FIG. 1 (the relationship between the arrangement occupancy ratio and the thrust and the attractive force) are slightly different depending on the structure of the entire linear motor, the material of the permanent magnet, and the like. It is desired to measure the characteristics for each material and set the arrangement occupancy ratio within a desired range based on the measurement results. It is desirable that such an arrangement occupancy ratio is set in a range in which the ratio of the arrangement occupancy ratio to the case where the arrangement occupancy ratio is 1 is 0.95 or more in thrust and 0.9 or less in suction force. Based on this, in the relationship of FIG. 1, the arrangement occupancy ratio is in a range of approximately 0.6 to 0.8.
【００３９】また、図１に示した特性は、ポールピッチ
Ｐｐが界磁コイル１３の配置ピッチ長の４分の３の場合
において測定したものだが、このようなピッチ関係にあ
ればどのような規模にあっても図１の特性に基づいて配
置占有比を設定することが可能である。もちろん、その
他のピッチ関係にある場合でも、そのピッチ関係におい
て測定した１つの特性を様々な規模のものにおいて利用
可能である。また、本発明の方法は、規模の大型のもの
に適用するほど、一層大きな効果を発揮する。The characteristics shown in FIG. 1 are measured when the pole pitch Pp is three-fourths of the arrangement pitch length of the field coil 13; However, the arrangement occupancy ratio can be set based on the characteristics shown in FIG. Of course, even in other pitch relations, one characteristic measured in the pitch relation can be used in various scales. In addition, the method of the present invention exerts a greater effect as it is applied to a large scale.
【００４０】また上記実施形態のリニアモータ界磁構造
１１は固定子側の界磁コイル１３が可動子側の永久磁石
列の両側を挟むように並設している構成であるが、他に
も図３に示すように界磁コイル１３が永久磁石列の片側
のみに並設する構成に適用しても有効となる。The linear motor field structure 11 of the above embodiment has a configuration in which the field coils 13 on the stator side are arranged side by side on both sides of the permanent magnet row on the mover side. As shown in FIG. 3, the present invention is also effective when applied to a configuration in which the field coils 13 are arranged side by side on only one side of the permanent magnet row.
【００４１】また問題となる吸引力は特に界磁コイル１
３の中心に位置する界磁コア１４（軟鉄製の鉄心）と永
久磁石１５との間で大きく生じるものであるが、図４に
示すような界磁コア１４を省略した構成においても吸引
力が存在するため本発明による方法および構成の適用が
有効となる。The attracting force that causes a problem is particularly the field coil 1.
3 is generated between the permanent magnet 15 and the field core 14 (soft iron core) located at the center of the center 3. However, even in a configuration in which the field core 14 is omitted as shown in FIG. The presence makes the application of the method and arrangement according to the invention effective.
【００４２】そして本発明は大きな推力を得るために上
記のような界磁構造を何層も密接に積層して構成するリ
ニアモータに特に有効となる。The present invention is particularly effective for a linear motor in which a number of layers of the above-described field structure are stacked closely to obtain a large thrust.
【００４３】また上記の実施形態は可動子側に永久磁石
を配置した構成となるが、逆に固定子側に永久磁石を配
置する構成においても本発明の方法が適用可能となる。In the above embodiment, the permanent magnet is arranged on the mover side. On the contrary, the method of the present invention can be applied to a structure in which the permanent magnet is arranged on the stator side.
【００４４】[0044]
【発明の効果】以上説明した通り本発明によれば、従来
単に製造者側の経験則に基づいて設定していた永久磁石
の配置占有比を、より実際のリニアモータの構造を考慮
した設定とすることにより、推力をほぼ低下させること
なく、同時に弊害として発生していた側方吸引力のみを
大幅に減少させることが可能となる。According to the present invention, as described above, according to the present invention, the permanent magnet arrangement occupancy ratio, which has been set simply based on the empirical rules of the manufacturer, can be changed to a setting that takes into account the actual structure of the linear motor. By doing so, it is possible to substantially reduce only the lateral suction force which has been generated as an adverse effect without substantially reducing the thrust.
【００４５】これにより構造設計の際、配置占有比を例
えば図１の関係に基づき０．６５に設定した場合には強
度計算上３０％の余裕をみることができることになり、
バックヨークを含むリニアモータの構造体の強度補強を
押さえることができ、また同時に永久磁石の使用量を最
小限にできるためリニアモータ全体の小型・軽量化、コ
ストの削減が可能となる。Accordingly, when the layout occupancy ratio is set to 0.65 based on the relationship shown in FIG. 1, for example, a 30% allowance can be obtained in the strength calculation.
The strength of the structure of the linear motor including the back yoke can be reduced, and at the same time, the amount of the permanent magnet used can be minimized, so that the entire linear motor can be reduced in size and weight and cost can be reduced.
【００４６】また固定子に接触する可動子側の滑動支持
部分周辺にかかる加重負担が大幅に減少するため、リニ
アモータ自体の高寿命化、高信頼性化に効果を発揮する
ものとなる。Further, since the load on the periphery of the sliding support portion on the mover side that comes into contact with the stator is greatly reduced, the linear motor itself is expected to have a long service life and high reliability.
【図１】永久磁石の配置占有比（永久磁石幅／ポールピ
ッチ）と推力、吸引力の関係を示すグラフである。FIG. 1 is a graph showing a relationship between an arrangement occupancy ratio of permanent magnets (permanent magnet width / pole pitch), thrust, and attraction.
【図２】本発明の第１実施形態にあるリニアモータ界磁
構造を示す図である。FIG. 2 is a diagram showing a linear motor field structure according to the first embodiment of the present invention.
【図３】本発明の第２実施形態にあるリニアモータ界磁
構造を示す図である。FIG. 3 is a diagram showing a linear motor field structure according to a second embodiment of the present invention.
【図４】本発明の第３実施形態にあるリニアモータ界磁
構造を示す図である。FIG. 4 is a diagram showing a linear motor field structure according to a third embodiment of the present invention.
【図５】従来のリニアモータ界磁構造を示す図である。FIG. 5 is a view showing a conventional linear motor field structure.
１１ 第１実施形態のリニアモータ界磁構造 １２ バックヨーク １３ 界磁コイル １４ 界磁コア １５ 永久磁石 11 Field structure of linear motor of first embodiment 12 Back yoke 13 Field coil 14 Field core 15 Permanent magnet
Claims (6)
置する方法において、 定ピッチ間隔の永久磁石配置列中における永久磁石の配
置占有比と推力及び吸引力との関係を測定し、その測定
結果に基づき、該推力をほぼそのままに維持しながら該
吸引力のみを減少させ得る範囲内に前記配置占有比を設
定することを特徴とするリニアモータの永久磁石配置方
法。In a method of arranging permanent magnets in a field structure of a linear motor, a relationship between an occupation ratio of the permanent magnets in a row of permanent magnets arranged at a constant pitch and thrust and attraction is measured. A method for arranging permanent magnets in a linear motor, comprising: setting the arrangement occupancy ratio within a range in which only the attraction force can be reduced while maintaining the thrust substantially unchanged based on the result.
れの値に対する割合において、前記推力が０．９５以上
であり、かつ前記吸引力が０．９以下となる範囲に該配
置占有比を設定したことを特徴とする請求項１記載のリ
ニアモータの永久磁石配置方法。2. The arrangement occupancy ratio is set in a range where the thrust is 0.95 or more and the suction force is 0.9 or less. 2. The method according to claim 1, wherein the permanent magnets are set.
ルの配置ピッチ長の４分の３の長さとし、 前記配置占有比を０．６以上０．８以下の範囲に設定し
たことを特徴とする請求項２記載のリニアモータの永久
磁石配置方法。3. The arrangement pitch length of the permanent magnets is set to three quarters of the arrangement pitch length of the field coils, and the arrangement occupancy ratio is set in a range of 0.6 or more and 0.8 or less. 3. The method for arranging permanent magnets of a linear motor according to claim 2, wherein
れる永久磁石の配置構造において、 前記定ピッチ間隔の永久磁石配列中における永久磁石の
配置占有比と推力及び吸引力との関係に基づき、該推力
をほぼそのままに維持しながら該吸引力のみを減少させ
得る範囲内に該配置占有比を設定したことを特徴とする
リニアモータの永久磁石配置構造。4. An arrangement structure of permanent magnets arranged at a constant pitch interval in a linear motor, wherein a permanent magnet arrangement at a constant pitch interval is based on a relationship between an occupation ratio of the permanent magnets, a thrust and an attractive force. A permanent magnet arrangement structure for a linear motor, wherein the arrangement occupancy ratio is set within a range where only the attraction force can be reduced while maintaining the thrust substantially unchanged.
れの値に対する割合において、前記推力が０．９５以上
であり、かつ前記吸引力が０．９以下となる範囲に該配
置占有比を設定したことを特徴とする請求項４記載のリ
ニアモータの永久磁石配置構造。5. The arrangement occupancy ratio in a range where the thrust is 0.95 or more and the suction force is 0.9 or less in a ratio with respect to each value when the arrangement occupancy ratio is 1. The permanent magnet arrangement structure for a linear motor according to claim 4, wherein the permanent magnet arrangement structure is set.
ルの配置ピッチ長の４分の３の長さであり、 前記配置占有比が０．６以上０．８以下の範囲にあるこ
とを特徴とする請求項５記載のリニアモータの永久磁石
配置構造。6. The arrangement pitch length of the permanent magnet is three quarters of the arrangement pitch length of the field coil, and the arrangement occupancy ratio is in a range of 0.6 or more and 0.8 or less. The permanent magnet arrangement structure for a linear motor according to claim 5, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14413398A JPH11341785A (en) | 1998-05-26 | 1998-05-26 | Permanent magnet arrangement structure for linear motor, and its arranging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14413398A JPH11341785A (en) | 1998-05-26 | 1998-05-26 | Permanent magnet arrangement structure for linear motor, and its arranging method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11341785A true JPH11341785A (en) | 1999-12-10 |
Family
ID=15354995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14413398A Pending JPH11341785A (en) | 1998-05-26 | 1998-05-26 | Permanent magnet arrangement structure for linear motor, and its arranging method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11341785A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7538469B2 (en) * | 2001-10-01 | 2009-05-26 | Magnemotion, Inc. | Synchronous machine design and manufacturing |
| US9346371B2 (en) | 2009-01-23 | 2016-05-24 | Magnemotion, Inc. | Transport system powered by short block linear synchronous motors |
| US9771000B2 (en) | 2009-01-23 | 2017-09-26 | Magnemotion, Inc. | Short block linear synchronous motors and switching mechanisms |
| US9802507B2 (en) | 2013-09-21 | 2017-10-31 | Magnemotion, Inc. | Linear motor transport for packaging and other uses |
-
1998
- 1998-05-26 JP JP14413398A patent/JPH11341785A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7538469B2 (en) * | 2001-10-01 | 2009-05-26 | Magnemotion, Inc. | Synchronous machine design and manufacturing |
| US9346371B2 (en) | 2009-01-23 | 2016-05-24 | Magnemotion, Inc. | Transport system powered by short block linear synchronous motors |
| US9771000B2 (en) | 2009-01-23 | 2017-09-26 | Magnemotion, Inc. | Short block linear synchronous motors and switching mechanisms |
| US10112777B2 (en) | 2009-01-23 | 2018-10-30 | Magnemotion, Inc. | Transport system powered by short block linear synchronous motors |
| US9802507B2 (en) | 2013-09-21 | 2017-10-31 | Magnemotion, Inc. | Linear motor transport for packaging and other uses |
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