JPH08191507A - Ground-abnormality detection device of magnetically-levitated train apparatus - Google Patents
Ground-abnormality detection device of magnetically-levitated train apparatusInfo
- Publication number
- JPH08191507A JPH08191507A JP218795A JP218795A JPH08191507A JP H08191507 A JPH08191507 A JP H08191507A JP 218795 A JP218795 A JP 218795A JP 218795 A JP218795 A JP 218795A JP H08191507 A JPH08191507 A JP H08191507A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- magnetic flux
- ground
- abnormality
- superconducting
- 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.)
- Granted
Links
Landscapes
- Control Of Vehicles With Linear Motors And Vehicles That Are Magnetically Levitated (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、車上に超電導磁石を搭
載し、地上に常電導の地上コイルを設置してなる磁気浮
上列車装置に係り、特に、車上で地上コイルの異常を検
出する地上コイル異常検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic levitation train device in which a superconducting magnet is mounted on a vehicle and a ground coil of normal conduction is installed on the ground, and particularly, an abnormality of the ground coil is detected on the vehicle. The present invention relates to a ground coil abnormality detection device.
【０００２】[0002]
【従来の技術】一般的な磁気浮上列車装置は、図７に示
すように、車両１の両側部にそれぞれ超電導コイル３を
収納した超電導磁石２が前後方向に所定の間隔で搭載さ
れている。また、地上の軌道７に沿ってその両側部に推
進コイル５及び浮上コイル６でなる地上コイルが所定の
間隔で設置されている。そして、車両１は、超電導磁石
２が推進コイル５によって推進力を得て動き始め、さら
に、動いたときの電磁誘導によって浮上コイル６に浮上
電流が誘起されてその浮上力を得て走行する。2. Description of the Related Art As shown in FIG. 7, a general magnetic levitation train apparatus has superconducting magnets 2 having superconducting coils 3 housed on both sides of a vehicle 1 at predetermined intervals in the front-rear direction. Further, ground coils consisting of the propulsion coil 5 and the levitation coil 6 are installed at predetermined intervals along both sides of the track 7 on the ground. Then, the vehicle 1 starts to move with the superconducting magnet 2 receiving the propulsion force by the propulsion coil 5, and further, the levitation current is induced in the levitation coil 6 by the electromagnetic induction when the superconducting magnet 2 moves, and the vehicle 1 travels with the levitation force.
【０００３】車両走行時に、何らかの原因で地上コイル
である推進コイル５又は浮上コイル６に短絡、地絡、断
線、逆結線等の異常現象が発生すると、異常現象が発生
した地上コイルには正常な走行時とは状態の異なった電
流が流れる。この場合、地上コイルの電流による磁界
と、超電導コイル３の励磁電流とのローレンツ力によっ
て、超電導コイル３に電磁力が発生する。また、地上コ
イルの異常による磁界の変化は超電導コイル３を収納す
る真空断熱容器に渦電流を誘起し、この渦電流は超電導
コイル３による直流磁界とのローレンツ力により真空断
熱容器に電磁力を生じさせる。When an abnormal phenomenon such as a short circuit, a ground fault, a wire break, or a reverse connection occurs in the propulsion coil 5 or the levitation coil 6 which is a ground coil for some reason while the vehicle is running, the ground coil in which the abnormal phenomenon occurs is normal. An electric current whose state is different from that during running flows. In this case, an electromagnetic force is generated in the superconducting coil 3 by the Lorentz force between the magnetic field generated by the ground coil current and the exciting current of the superconducting coil 3. Further, the change in the magnetic field due to the abnormality of the ground coil induces an eddy current in the vacuum heat insulating container housing the superconducting coil 3, and this eddy current causes an electromagnetic force in the vacuum heat insulating container by the Lorentz force with the DC magnetic field by the superconducting coil 3. Let
【０００４】こうした電磁力は脈動成分を増加させるた
め、乗り心地が損なわれると共に、台車が軌道７に接触
するなどの危険性がでてくる。また、超電導コイル３や
永久電流スイッチのクエンチ、冷却配管系の破損、浮上
コイル６を支持する支持具の破損、真空断熱容器の変
形、地上コイルの破損等の原因となる場合もあった。Since such electromagnetic force increases the pulsating component, the riding comfort is impaired and there is a risk that the carriage contacts the track 7. Further, there are cases in which quenching of the superconducting coil 3 and the permanent current switch, damage to the cooling piping system, damage to the support for supporting the levitation coil 6, deformation of the vacuum insulation container, damage to the ground coil, etc.
【０００５】そこで、地上コイルの異常を検出し、速や
かに異常コイルの交換あるいは修理によって、異常を取
り除く必要がある。地上コイルの異常を検出する従来の
方法として、個々の地上コイルに電流を流してそのリア
クタンスを測定する方法があった。しかるに、磁気浮上
式鉄道においては、全走行区間に亘って地上コイルが設
置されているため、この方法では多大の労力と時間を要
し、さらに運転時間外に検査しなければならなかった。Therefore, it is necessary to detect the abnormality of the ground coil and promptly remove the abnormality by replacing or repairing the abnormal coil. As a conventional method for detecting an abnormality in the ground coil, there is a method in which a current is passed through each ground coil to measure its reactance. However, in the magnetically levitated railway, since ground coils are installed over the entire traveling section, this method requires a great deal of labor and time, and further inspection must be performed outside the operating hours.
【０００６】この不具合を解消するべく、例えば、特開
昭54-118020 号公報には、列車上に複数の磁束検知コイ
ルを、それぞれ地上コイルのコイルピッチの整数倍離し
て設けると共に、これらのコイルの出力を比較してオン
ラインにて地上コイルの異常を検出する方法や、列車上
に設けた一つの磁束検知コイルの出力とこれを遅らせる
遅延回路の出力とを比較して同じくオンラインにて地上
コイルの異常を検出方法が開示されている。In order to solve this problem, for example, in Japanese Patent Laid-Open No. 54-118020, a plurality of magnetic flux detecting coils are provided on a train at an integer multiple of the coil pitch of the ground coil, and these coils are provided. Method to detect an abnormality in the ground coil online by comparing the output of the above, or compare the output of one magnetic flux detection coil installed on the train with the output of the delay circuit that delays this A method for detecting the abnormality is disclosed.
【０００７】また、特開平6 -86410号公報には、車両上
に地上コイルと鎖交する磁束を左右非対称にする磁束非
対称化手段を設けることによって、常に、地上コイル及
び接続線に電流を流して、オンラインにて地上コイル及
びその接続線の異常を検知する方法が開示されている。Further, in Japanese Patent Laid-Open No. 6-86410, a magnetic flux asymmetry means is provided on the vehicle to make the magnetic flux interlinking with the ground coil asymmetrical, so that a current is always applied to the ground coil and the connecting wire. A method of detecting an abnormality in the ground coil and its connecting line is disclosed online.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、特開昭
54-118020 号公報に開示されたものは、磁束検知コイル
の装着方法等が明示されておらず、例えば、磁束検知コ
イルを超電導磁石の軌道側の表面部に貼付した場合に
は、地上コイルとの対向面に凸部ができてしまい、これ
が地上コイルに接触する恐れがあり、高速で走行する磁
気浮上列車に対してその固定及び保護が問題となる。ま
た、超電導磁石を構成する外槽としての真空断熱容器は
地上コイル側からの高調波磁界を遮蔽する機能をも備え
ているため、磁束検知コイルを設置する場合に、地上コ
イル側からの高調波磁界を遮蔽する渦電流の流路を妨げ
ないようにすることが肝要であるにも拘らず、その対策
も示されていなかった。SUMMARY OF THE INVENTION
The method disclosed in Japanese Patent No. 54-118020 does not clearly show how to attach the magnetic flux detection coil.For example, when the magnetic flux detection coil is attached to the surface of the superconducting magnet on the orbital side, There is a possibility that a convex portion will be formed on the opposing surface of the above, and this may come into contact with the ground coil, and fixing and protection of the magnetic levitation train running at high speed becomes a problem. In addition, since the vacuum insulation container as an outer tank that constitutes the superconducting magnet also has the function of shielding the harmonic magnetic field from the ground coil side, when installing the magnetic flux detection coil, the harmonic Although it is essential that the flow path of the eddy current that shields the magnetic field is not obstructed, measures against it have not been disclosed.
【０００９】また、特開平6 -86410号公報に開示された
ものは、磁束の非対称化によって超電導コイルに働く変
形力に対処しなければならず、また、地上コイルに電流
を流すことによる損失が発生するという問題もあった。The device disclosed in Japanese Patent Laid-Open No. 6-86410 has to deal with the deforming force acting on the superconducting coil due to the asymmetry of the magnetic flux, and the loss due to the current flowing through the ground coil. There was also a problem that it would occur.
【００１０】本発明は上記の問題点を解決するためにな
されたもので、オンラインで地上コイルの異常を検出す
るに当たり、磁束検知コイルの確実な固定と保護を図り
得、地上コイルからの高調波磁界の遮蔽機能を確保しつ
つ、超電導コイルに変形力を作用させることのない磁気
浮上列車装置の地上コイル異常検出装置を提供すること
を目的とする。The present invention has been made to solve the above problems, and when detecting an abnormality of the ground coil online, the magnetic flux detecting coil can be reliably fixed and protected, and the harmonics from the ground coil can be achieved. An object of the present invention is to provide a ground coil abnormality detection device for a magnetic levitation train device that does not exert a deforming force on a superconducting coil while ensuring a magnetic field shielding function.
【００１１】[0011]
【課題を解決するための手段】両側部の前後方向に複数
の超電導磁石が所定の間隔で配置された車両と、地上の
軌道に沿って両側部に所定の間隔で配置された推進コイ
ル、及び、上下二つを互いに逆向きに接続した８の字型
の浮上コイルを含んでなる多数の地上コイルとで磁気浮
上列車装置が構成されているとき、請求項１に記載の地
上コイル異常検出装置は、車両の同じ側部に配置された
少なくとも二つの超電導磁石に対して、容器の軌道側側
面板の前後面及び上下面を連ねた外周部に連続して形成
された溝と、溝にそれぞれ埋めた状態で巻装された磁束
検知コイルと、二つの磁束検知コイルに発生した電圧を
比較する比較手段とを備え、比較手段の比較結果に基づ
いて地上コイルの異常を検出することを特徴としてい
る。A vehicle in which a plurality of superconducting magnets are arranged at predetermined intervals in front and rear directions on both sides, a propulsion coil arranged at both sides at predetermined intervals along a ground track, and 2. The ground coil abnormality detection device according to claim 1, wherein the magnetic levitation train device is configured with a plurality of ground coils including an 8-shaped levitation coil in which upper and lower two are connected in opposite directions. Is at least two superconducting magnets arranged on the same side of the vehicle, and a groove formed continuously on the outer peripheral portion connecting the front and rear surfaces and the upper and lower surfaces of the track side surface plate of the container, and the groove, respectively. It is characterized by including a magnetic flux detection coil wound in a buried state and a comparison means for comparing the voltages generated in two magnetic flux detection coils, and detecting an abnormality of the ground coil based on the comparison result of the comparison means. There is.
【００１２】請求項２に記載の地上コイル異常検出装置
は、車両の側部に配置された少なくとも一つの超電導磁
石に対して、容器の軌道側側面板の前後面及び上下面を
連ねた外周部に連続して形成された溝と、溝に埋めた状
態で巻装された磁束検知コイルと、磁束検知コイルに発
生した電圧を入力し、所定の時間だけ遅延させて出力す
る遅延手段と、磁束検知コイルに発生した電圧と遅延手
段の出力電圧とを比較する比較手段とを備え、比較手段
の比較結果に基づいて地上コイルの異常を検出すること
を特徴としている。The ground coil abnormality detecting device according to a second aspect of the present invention is an outer peripheral portion in which the front and rear surfaces and the upper and lower surfaces of the side plate on the track side of the container are connected to at least one superconducting magnet arranged on the side portion of the vehicle. A groove formed continuously in the groove, a magnetic flux detection coil wound in a state of being buried in the groove, a delay unit for inputting a voltage generated in the magnetic flux detection coil and delaying and outputting the voltage for a predetermined time, and a magnetic flux. It is characterized in that it comprises a comparison means for comparing the voltage generated in the detection coil with the output voltage of the delay means, and detects an abnormality of the ground coil based on the comparison result of the comparison means.
【００１３】請求項３に記載の地上コイル異常検出装置
は、車両の側部に配置された少なくとも一つの超電導磁
石に対して、容器の軌道側側面板の前後面及び上下面を
連ねた外周部に連続して形成された溝と、容器の軌道側
側面板の上下浮上コイルの中央部に対向する位置に、前
後方向に貫通するように穿たれた孔と、孔を通して軌道
側側面板の前後面及び上面に形成された溝に埋めた状態
で巻装された第１の磁束検知コイルと、孔を通して軌道
側側面板の前後面及び下面に形成された溝に埋めた状態
で巻装された第２の磁束検知コイルとを備え、第１及び
第２の磁束検知コイルに発生した電圧に基づいて浮上コ
イルの異常を検出することを特徴としている。According to a third aspect of the present invention, there is provided a ground coil abnormality detecting device, wherein at least one superconducting magnet arranged on a side portion of a vehicle is connected to an outer peripheral portion of front and rear surfaces and upper and lower surfaces of a side plate on a track side of a container. Groove formed continuously in the container, a hole facing the center of the vertical levitation coil on the track side plate of the container, and a hole drilled through the hole in the front-rear direction. The first magnetic flux detecting coil wound in the groove formed in the surface and the upper surface, and wound in the groove formed in the front and rear surfaces and the lower surface of the raceway side plate through the hole. A second magnetic flux detecting coil is provided, and an abnormality of the levitation coil is detected based on the voltage generated in the first and second magnetic flux detecting coils.
【００１４】[0014]
【作用】一般に、車両に搭載された超電導磁石が異常の
生じた地上コイルと対向して通過するとき、磁束検知コ
イルは通常走行時と異なる磁束を検出する。若し、車両
の同じ側部に配置された二つの超電導磁石にそれぞれ磁
束検知コイルを装着した場合、一方の磁束検知コイルが
異常の地上コイルに対向したとき他方の磁束検知コイル
は正常の地上コイルに対向するから両者に出力差を生じ
ることとなり、従って、その出力を比較すれば地上コイ
ルの異常を検出することができる。In general, when the superconducting magnet mounted on the vehicle passes in opposition to the abnormal ground coil, the magnetic flux detecting coil detects a magnetic flux different from that during normal traveling. If two superconducting magnets placed on the same side of the vehicle are equipped with magnetic flux detection coils, when one of the magnetic flux detection coils faces an abnormal ground coil, the other magnetic flux detection coil becomes a normal ground coil. Since there is a difference in output between the two, it is possible to detect an abnormality in the ground coil by comparing the outputs.
【００１５】請求項１に記載の地上コイル異常検出装置
においては、このようにして地上コイルの異常を検出す
るが、この場合、超電導磁石の軌道側側面板の前後面及
び上下面を連ねた外周部に磁束検知コイルを装着してい
るので、地上コイルからの高調波磁界の遮蔽機能を確保
できると共に、超電導コイルに変形力を作用させること
がなく、また、磁束検知コイルを連続して形成した溝に
埋め込むように装着しているので、その確実な固定と保
護が図られる。In the ground coil abnormality detecting device according to the first aspect, the ground coil abnormality is detected in this way. In this case, the outer periphery of the front and rear surfaces and the upper and lower surfaces of the orbit side plate of the superconducting magnet is connected. Since the magnetic flux detection coil is attached to the part, the function of shielding the harmonic magnetic field from the ground coil can be secured, the deforming force does not act on the superconducting coil, and the magnetic flux detection coil is formed continuously. Since it is mounted so as to be embedded in the groove, it can be securely fixed and protected.
【００１６】ところで、超電導磁石の軌道側側面板の外
周部に装着した磁束検知コイルの電圧と、この電圧を、
例えば、隣接する超電導磁石の相互距離だけ通過する時
間だけ遅延させた電圧とを比較した場合、上述した二つ
の磁束検知コイルの出力を比較したと同様な信号差が得
られる。請求項２に記載の地上コイル異常検出装置にお
いては、一つの超電導磁石の軌道側側面板に上述したと
同様に磁束検知コイルを装着し、この磁束検知コイルに
発生した電圧を所定の時間だけ遅延させてその差から地
上コイルの異常を検出しているので、磁束検知コイルが
一つで済むという利点がある。By the way, the voltage of the magnetic flux detecting coil mounted on the outer peripheral portion of the side plate on the orbit side of the superconducting magnet and this voltage are
For example, when comparing the voltage delayed by the time that the adjacent superconducting magnets pass by the mutual distance, the same signal difference as when comparing the outputs of the two magnetic flux detection coils described above is obtained. In the ground coil abnormality detecting device according to claim 2, the magnetic flux detecting coil is mounted on the orbital side plate of one superconducting magnet in the same manner as described above, and the voltage generated in this magnetic flux detecting coil is delayed by a predetermined time. Since the abnormality of the ground coil is detected from the difference, there is an advantage that only one magnetic flux detection coil is required.
【００１７】請求項３に記載の地上コイル異常検出装置
においては、上下浮上コイルに対応して二つの磁束検知
コイルを装着し、この二つのコイルが発生した電圧を利
用するので、短絡した地上コイルを特定するための極め
て有効な情報が得られる利点がある。In the ground coil abnormality detecting device according to the third aspect of the present invention, two magnetic flux detecting coils are mounted in correspondence with the vertical levitation coil, and the voltage generated by these two coils is used. There is an advantage that extremely effective information for identifying
【００１８】[0018]
【実施例】以下、本発明を図面に示す実施例によって詳
細に説明する。図１は本発明の第１実施例の磁束検知コ
イルの装着状態を示す断面図である。一般に、超電導磁
石は、超電導コイルを冷媒と共にコイル容器である内槽
に収納し、さらに、真空断熱容器である外槽の内部に支
持されている。図１においては、図面の簡単化のため
に、単に超電導コイル３を収納した形の超電導磁石２と
して示している。超電導磁石２を構成する外槽は、超電
導コイル３の外側に軌道側側面板2aを備えている。この
軌道側側面板2aの上下面及び前後面を連ねた外周部に、
連続した溝2bが形成されている。この溝2bには、図示省
略の絶縁物を介して、磁束検出コイル４が埋め込む状態
で装着されている。この場合、超電導磁石２には複数の
超電導コイル３が収納されているため、磁束検出コイル
４は複数の超電導コイル３に対応して一つだけ設けら
れ、また、これに隣接する後部の超電導磁石にも同様に
して磁束検出コイルが装着されている。なお、軌道７の
両側部には、超電導磁石２と対向して最外側に推進コイ
ル５が、その内側に上下二つを互いに逆向きに８の字型
に接続される浮上コイル６がそれぞれ配設されている。The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a sectional view showing a mounted state of a magnetic flux detecting coil according to the first embodiment of the present invention. Generally, a superconducting magnet accommodates a superconducting coil together with a refrigerant in an inner tank which is a coil container, and is further supported inside an outer tank which is a vacuum heat insulating container. In FIG. 1, for simplification of the drawing, it is shown as a superconducting magnet 2 in which a superconducting coil 3 is simply housed. The outer tub constituting the superconducting magnet 2 is provided with a track-side side plate 2a outside the superconducting coil 3. On the outer peripheral part that connects the upper and lower surfaces and the front and rear surfaces of the track side surface plate 2a,
A continuous groove 2b is formed. The magnetic flux detection coil 4 is mounted in the groove 2b via an insulator (not shown) in a buried state. In this case, since the plurality of superconducting coils 3 are housed in the superconducting magnet 2, only one magnetic flux detecting coil 4 is provided corresponding to the plurality of superconducting coils 3, and the superconducting magnets in the rear portion adjacent to the magnetic flux detecting coil 4 are provided. Similarly, a magnetic flux detection coil is attached. In addition, on both sides of the track 7, a propulsion coil 5 is arranged facing the superconducting magnet 2 on the outermost side, and a levitation coil 6 which is vertically connected to each other in a figure 8 shape is arranged on the innermost side thereof. It is set up.
【００１９】図２は同じ側部の前後に隣接する二つの超
電導磁石の各軌道側側面板に巻装された磁束検出コイル
4a，4bの出力電圧に基づいて地上コイルの異常を検出す
る概略構成図であり、磁束検出コイル4a，4bの出力電圧
を比較器８で比較し、その差電圧を図示省略の計算機に
取込むようになっている。この場合、車両の走行時、磁
束検出コイル4a，4bは地上に配設された推進コイル5a，
5b，5c，…，5h，…に対して、常に複数と対向しながら
移動する。FIG. 2 shows a magnetic flux detecting coil wound around the side plates on the orbital sides of two superconducting magnets adjacent to each other on the same side.
It is a schematic block diagram which detects the abnormality of the ground coil based on the output voltage of 4a, 4b, compares the output voltage of the magnetic flux detection coils 4a, 4b with the comparator 8, and takes in the difference voltage in the calculator which is not shown in figure. It is like this. In this case, when the vehicle is traveling, the magnetic flux detection coils 4a, 4b are the propulsion coils 5a,
5b, 5c, ..., 5h ,.
【００２０】いま、推進コイル5cが短絡したとすれば、
この推進コイル自体の大きさの短絡ループが形成され
る。超電導コイルの電流による磁束と短絡した推進コイ
ル5cとが相対運動を行うため、推進コイル5cには電磁誘
導によって短絡電流が発生する。この短絡電流は数値計
算によると走行速度が５００ｋｍ／ｈである場合に正常
時と比較して５〜１０倍程度の起磁力となる。この短絡
電流が超電導磁石に装着された磁束検出コイル4aに変動
磁束を与えるため、電磁誘導によって磁束検出コイル4a
には短絡電流に応じた電圧が誘起される。Now, assuming that the propulsion coil 5c is short-circuited,
A short circuit loop of the size of the propulsion coil itself is formed. Since the magnetic flux due to the current of the superconducting coil and the short-circuited propulsion coil 5c make relative motion, a short-circuit current is generated in the propulsion coil 5c by electromagnetic induction. According to the numerical calculation, this short-circuit current has a magnetomotive force of about 5 to 10 times that at the time of traveling speed of 500 km / h as compared with the normal state. This short-circuit current gives a fluctuating magnetic flux to the magnetic flux detection coil 4a attached to the superconducting magnet, so that the magnetic flux detection coil 4a is electromagnetically induced.
A voltage corresponding to the short-circuit current is induced in the.
【００２１】一方、別の超電導磁石に装着された磁束検
出コイル4bは正常な推進コイルによる磁束を検知するた
め、磁束検出コイル4aと比較すれば、より小さな電圧が
誘起されるだけである。比較器８は磁束検出コイル4aに
誘起された電圧と、磁束検出コイル4bに誘起された電圧
とを比較してその差電圧を図示省略の計算機に与える。On the other hand, since the magnetic flux detecting coil 4b mounted on another superconducting magnet detects the magnetic flux of the normal propulsion coil, a smaller voltage is induced as compared with the magnetic flux detecting coil 4a. The comparator 8 compares the voltage induced in the magnetic flux detecting coil 4a with the voltage induced in the magnetic flux detecting coil 4b, and supplies the difference voltage to a computer (not shown).
【００２２】因みに、計算機は比較器８の出力電圧に基
づいて、推進コイルから受ける磁束量が通常時の２倍以
上になったとき、推進コイルの異常と判定している。Incidentally, the computer judges that the propulsion coil is abnormal based on the output voltage of the comparator 8 when the amount of magnetic flux received from the propulsion coil is more than twice the normal value.
【００２３】図３は上述した磁束検出コイル4a，4b及び
比較器８を用いて、浮上コイルの短絡を検出する説明図
である。正常状態の浮上コイルは上下二つを互いに逆向
きに接続した８の字型コイルであり、車両の走行時、磁
束検出コイル4a，4bは地上に配設された浮上コイル6a，
6b，6c，…，6h，…，6oに対して、常に複数と対向しな
がら移動する。FIG. 3 is an explanatory view for detecting a short circuit of the levitation coil by using the magnetic flux detection coils 4a and 4b and the comparator 8 described above. The levitation coil in a normal state is an 8-shaped coil in which the upper and lower two are connected in opposite directions. When the vehicle is running, the magnetic flux detection coils 4a and 4b are the levitation coils 6a and
6b, 6c, ..., 6h, ..., 6o always move while facing a plurality.
【００２４】いま、浮上コイル6eが短絡したとすれば、
上のコイルと下のコイルとがそれぞれの大きさの短絡ル
ープを形成する。超電導コイルの電流による磁束と短絡
した浮上コイル6eとが相対運動を行うため、短絡した浮
上コイル6eには電磁誘導によって短絡電流が発生する。
正常状態の８の字型の浮上コイルには、上下で逆向きの
電流が流れるのに対して、短絡状態の上下のコイルに
は、上下で同じ向きの電流が流れる。これにより、上述
した如く、磁束検出コイル4aに誘起される電圧と磁束検
出コイル4bに誘起される電圧との差に変化を生じるた
め、この電圧差の変化から浮上コイルの異常を検出する
ことができる。Now, if the levitation coil 6e is short-circuited,
The upper coil and the lower coil form a short circuit loop of each size. Since the magnetic flux generated by the current of the superconducting coil and the short-circuited levitation coil 6e make relative movement, a short-circuit current is generated in the short-circuited levitation coil 6e by electromagnetic induction.
In the normal state, the figure-eight type levitation coil has currents flowing up and down in opposite directions, whereas in the coils having a short circuit, currents flowing up and down have the same direction. As a result, as described above, the difference between the voltage induced in the magnetic flux detecting coil 4a and the voltage induced in the magnetic flux detecting coil 4b is changed, and therefore the abnormality of the levitation coil can be detected from the change in the voltage difference. it can.
【００２５】以上、推進コイル及び浮上コイルに短絡が
発生した場合にその異常検出について説明したが、地
絡、断線、逆結線等の異常についても、車両通過時に異
常なものと正常なものとで発生磁束に差が現れるので、
上述した装置によってその異常を検出することができ
る。In the above, the abnormality detection in the case where the propulsion coil and the levitation coil are short-circuited has been described. However, regarding the abnormality such as ground fault, disconnection, reverse connection, etc. Since a difference appears in the generated magnetic flux,
The abnormality can be detected by the device described above.
【００２６】かくして、本実施例によれば、超電導磁石
の軌道側側面板の前後面及び上下面を連ねた外周部に磁
束検知コイルを装着しているので、地上コイルからの高
調波磁界の遮蔽機能を確保できると共に、超電導コイル
に変形力を作用させることがなく、また、磁束検知コイ
ルを連続して形成した溝に埋め込むように装着している
ので、その確実な固定と保護が図られる。Thus, according to the present embodiment, since the magnetic flux detecting coil is mounted on the outer peripheral portion of the front and rear surfaces and the upper and lower surfaces of the orbital side surface plate of the superconducting magnet, the harmonic magnetic field from the ground coil is shielded. The function can be ensured, the deforming force is not applied to the superconducting coil, and the magnetic flux detecting coil is mounted so as to be embedded in the continuously formed groove, so that its reliable fixing and protection can be achieved.
【００２７】さらに、上述した特開昭54-118020 号公報
に開示されたものは、磁束検知コイルを地上コイルのコ
イルピッチの整数倍だけ離して車上に設ける必要性があ
ったのに対して、本実施例では所定数の地上コイルに同
等な関係で対向する超電導磁石に磁束検出コイルを設け
るので、相互間隔について特別の配慮が不要となり、構
成の簡易化及び取付け作業の容易化が図られる。Further, in the one disclosed in the above-mentioned Japanese Patent Laid-Open No. 54-118020, it was necessary to dispose the magnetic flux detecting coil on the vehicle with an integral multiple of the coil pitch of the ground coil. In the present embodiment, since the magnetic flux detection coil is provided in the superconducting magnets facing each other in the same relationship as the predetermined number of ground coils, no special consideration is given to the mutual spacing, which simplifies the configuration and facilitates the mounting work. .
【００２８】図４は本発明の第２実施例の概略構成と併
せて、推進コイルの異常検出動作を説明するための説明
図である。これは、図１に示したと全く同様に超電導磁
石２に磁束検出コイル４を装着するが、ここでは単一の
磁束検出コイル４の出力のみに基づいて地上コイルの異
常を検出するように構成されている。すなわち、磁束検
出コイル４に遅延回路９が接続され、比較器８は磁束検
出コイル４の出力を一方入力、遅延回路９の出力を他方
入力として両入力を比較し、その差電圧を図示省略の計
算機に与える構成になっている。ここで、遅延回路９は
車両が超電導磁石の１ピッチ分だけ走行するに要する時
間分以上、入力信号を遅延して出力するものである。若
し、遅延回路９の遅延時間を超電導磁石の１ピッチ分だ
け走行するに要する時間に設定すれば、第１実施例で説
明したと全く同様にして推進コイル5a，5b，5c，…，5
h，…の異常検出が可能である。また、１ピッチ分だけ
走行するに要する時間の整数倍でも同様にして異常検出
ができ、さらに、整数倍でないとしても、原理的には異
常検出が可能であることは明らかである。FIG. 4 is an explanatory diagram for explaining the abnormality detection operation of the propulsion coil, together with the schematic configuration of the second embodiment of the present invention. The magnetic flux detecting coil 4 is attached to the superconducting magnet 2 in exactly the same manner as shown in FIG. 1, but here it is configured to detect the abnormality of the ground coil based on only the output of the single magnetic flux detecting coil 4. ing. That is, the delay circuit 9 is connected to the magnetic flux detection coil 4, the comparator 8 compares the two inputs with the output of the magnetic flux detection coil 4 as one input and the output of the delay circuit 9 as the other input, and the difference voltage thereof is not shown. It is designed to be given to a computer. Here, the delay circuit 9 delays and outputs the input signal for the time required for the vehicle to travel one pitch of the superconducting magnet. If the delay time of the delay circuit 9 is set to the time required to travel one pitch of the superconducting magnet, the propulsion coils 5a, 5b, 5c, ..., 5 are performed in exactly the same manner as described in the first embodiment.
Anomalies such as h, ... Can be detected. Further, it is obvious that the abnormality can be detected in the same manner even if it is an integral multiple of the time required to travel by one pitch, and further, even if it is not an integral multiple, the abnormality can be detected in principle.
【００２９】図５は第２実施例の装置を用いて、浮上コ
イルの短絡を検出する説明図である。いま、浮上コイル
6eが短絡したとすれば、図３を用いて説明したと同様な
原理にて磁束検出コイル４に誘起される電圧に時間的な
変化を生じ、その差電圧の変化から浮上コイルの異常を
検出することができる。また、推進コイル及び浮上コイ
ルに発生する地絡、断線、逆結線等の異常についても、
第２実施例の装置によって同様に検出することができ
る。FIG. 5 is an explanatory view for detecting a short circuit of the levitation coil by using the device of the second embodiment. Now the levitating coil
If 6e is short-circuited, the voltage induced in the magnetic flux detection coil 4 changes with time according to the same principle as described with reference to FIG. 3, and the abnormality of the levitation coil is detected from the change in the difference voltage. can do. In addition, regarding abnormalities such as ground fault, disconnection, reverse connection, etc. that occur in the propulsion coil and the levitation coil,
It can be similarly detected by the device of the second embodiment.
【００３０】かくして、第２実施例によっても、地上コ
イルからの高調波磁界の遮蔽機能を確保できると共に、
超電導コイルに変形力を作用させることなく地上コイル
の異常検出ができ、また、磁束検知コイルを連続して形
成した溝に埋め込むように装着しているので、その確実
な固定と保護が図られる。また、この第２実施例によれ
ば、磁束検知コイルが一つで済むという利点もある。Thus, according to the second embodiment as well, the function of shielding the harmonic magnetic field from the ground coil can be ensured, and
Abnormality of the ground coil can be detected without applying a deforming force to the superconducting coil, and since the magnetic flux detecting coil is mounted so as to be embedded in the groove formed continuously, its reliable fixing and protection can be achieved. Further, according to the second embodiment, there is also an advantage that only one magnetic flux detecting coil is required.
【００３１】図６は本発明の第３実施例の概略構成図で
ある。図中、図１と同一の要素には同一の符号を付して
その説明を省略する。図１に示したものは、超電導磁石
２の軌道側側面板の外周部に一つの磁束検出コイルを設
けているが、ここでは、上部に磁束検出コイル4Xが、下
部に磁束検出コイル4Yがそれぞれ設けられており、この
点が図１と構成上、異なっている。FIG. 6 is a schematic block diagram of the third embodiment of the present invention. In the figure, the same elements as those of FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. The one shown in FIG. 1 is provided with one magnetic flux detection coil on the outer peripheral portion of the orbital side surface plate of the superconducting magnet 2, but here, the magnetic flux detection coil 4X is provided at the upper part and the magnetic flux detection coil 4Y is provided at the lower part. It is provided, and this point is different in configuration from FIG. 1.
【００３２】ここで、超電導磁石２の軌道側側面板に対
向する位置に浮上コイル６が設けられている。浮上コイ
ル６は上部コイルと下部コイルとが逆向きに接続され
る。この上部コイルと下部コイルとの中間部に対応する
位置の軌道側側面板に、その前後方向に貫通する孔2cが
設けられている。また、軌道側側面板の外周面には前述
した溝が形成されており、孔2cはこの溝と交わるように
穿たれている。そして、孔2cを通して上面及び前後面の
溝の内部に磁束検出コイル4Xが埋まるように巻装され、
同じく孔2cを通して下面及び前後面の溝の内部に磁束検
出コイル4Yが埋まるように巻装されている。これらの磁
束検出コイル4X，4Yの出力端は図示省略の計算機に接続
される。Here, the levitation coil 6 is provided at a position facing the orbital side surface plate of the superconducting magnet 2. The upper coil and the lower coil of the levitation coil 6 are connected in opposite directions. A hole 2c penetrating in the front-rear direction is provided in the side surface plate on the track side at a position corresponding to an intermediate portion between the upper coil and the lower coil. Further, the groove described above is formed on the outer peripheral surface of the side plate on the track side, and the hole 2c is formed so as to intersect with this groove. Then, the magnetic flux detection coil 4X is wound so as to be embedded inside the groove on the upper surface and the front and rear surfaces through the hole 2c,
Similarly, the magnetic flux detecting coil 4Y is wound so as to be buried in the grooves on the lower surface and the front and rear surfaces through the hole 2c. The output terminals of these magnetic flux detection coils 4X and 4Y are connected to a computer (not shown).
【００３３】いま、浮上コイル６が短絡したとすると、
短絡の生じる位置によって上下の浮上コイルの短絡ルー
プのインピーダンスが異なるため、上下浮上コイルによ
って生じる異常磁束が異なり、上下の磁束検知コイル4
X，4Yの出力も特有な形状で変化する。この上下の磁束
検知コイル4X，4Yの出力信号を解析することによって、
短絡した地上コイルを特定することができ、また、第１
又は第２実施例と併用することにより、短絡した地上コ
イルを特定するための有力な情報が得られる。Now, assuming that the levitation coil 6 is short-circuited,
Since the impedance of the short circuit loop of the upper and lower levitation coils differs depending on the position where the short circuit occurs, the abnormal magnetic flux generated by the upper and lower levitation coils differs, and the upper and lower magnetic flux detection coils 4
The X and 4Y outputs also change with a unique shape. By analyzing the output signals of the upper and lower magnetic flux detection coils 4X and 4Y,
The shorted ground coil can be identified, and the first
Alternatively, in combination with the second embodiment, powerful information for identifying the short-circuited ground coil can be obtained.
【００３４】この実施例においても、孔2cが上下浮上コ
イルの中間部に対向する位置に設けられているので、浮
上コイルによる高調波磁界による渦電流の流路を妨げ
ず、また、超電導コイルに変形力を作用させることなく
地上コイルの異常を検出することができる。さらに、磁
束検知コイルを連続して形成した溝に埋め込むように装
着しているので、その確実な固定と保護が図られる。Also in this embodiment, since the hole 2c is provided at a position facing the intermediate portion of the vertical levitation coil, it does not interfere with the flow path of the eddy current due to the harmonic magnetic field generated by the levitation coil, and An abnormality of the ground coil can be detected without applying a deforming force. Further, since the magnetic flux detecting coil is mounted so as to be embedded in the groove formed continuously, its reliable fixing and protection can be achieved.
【００３５】[0035]
【発明の効果】以上の説明によって明らかなように、請
求項１に記載の地上コイル異常検出装置によれば、軌道
側側面板の外周部に磁束検知コイルを装着しているの
で、地上コイルからの高調波磁界の遮蔽機能を確保し、
かつ、超電導コイルに変形力を作用させることなく異常
検出ができ、また、磁束検知コイルを連続して形成した
溝に埋め込むように装着しているので、その確実な固定
と保護が図られる。また、請求項２に記載の地上コイル
異常検出装置によれば、磁束検知コイルが一つで済むと
いう新たな効果がある。さらに、請求項３に記載の地上
コイル異常検出装置によれば、短絡した地上コイルを特
定するための極めて有効な情報が得られるという効果が
得られる。As is apparent from the above description, according to the ground coil abnormality detecting device of the first aspect, since the magnetic flux detecting coil is mounted on the outer peripheral portion of the side plate on the orbit side, Securing the harmonic magnetic field shielding function of
In addition, abnormality can be detected without applying a deforming force to the superconducting coil, and since the magnetic flux detecting coil is mounted so as to be embedded in the groove formed continuously, its reliable fixing and protection can be achieved. Further, according to the ground coil abnormality detecting device of the second aspect, there is a new effect that only one magnetic flux detecting coil is required. Further, according to the above ground coil abnormality detecting device of the third aspect, it is possible to obtain an effect that extremely effective information for identifying the shorted ground coil can be obtained.
【図１】本発明の第１実施例の磁束検知コイルの装着状
態を示す断面図。FIG. 1 is a sectional view showing a mounted state of a magnetic flux detection coil according to a first embodiment of the present invention.
【図２】本発明の第１実施例の概略構成と併せて、推進
コイルの異常検出動作を説明するための説明図。FIG. 2 is an explanatory diagram for explaining an abnormality detection operation of the propulsion coil together with the schematic configuration of the first embodiment of the present invention.
【図３】本発明の第１実施例を用いた場合の、浮上コイ
ルの異常検出動作を説明するための説明図。FIG. 3 is an explanatory diagram for explaining an abnormality detection operation of the levitation coil when the first embodiment of the present invention is used.
【図４】本発明の第２実施例の概略構成と併せて、推進
コイルの異常検出動作を説明するための説明図。FIG. 4 is an explanatory diagram for explaining an abnormality detection operation of the propulsion coil together with the schematic configuration of the second embodiment of the present invention.
【図５】本発明の第２実施例を用いた場合の、浮上コイ
ルの異常検出動作を説明するための説明図。FIG. 5 is an explanatory diagram for explaining an abnormality detecting operation of the levitation coil when the second embodiment of the present invention is used.
【図６】本発明の第３実施例の磁束検知コイルの装着状
態を示す断面図。FIG. 6 is a cross-sectional view showing a mounted state of a magnetic flux detection coil according to a third embodiment of the present invention.
【図７】本発明を適用する磁気浮上列車装置の概略構成
図。FIG. 7 is a schematic configuration diagram of a magnetic levitation train device to which the present invention is applied.
１ 車両 ２ 超電導磁石 ２ａ 軌道側側面板 ２ｂ 溝 ２ｃ 孔 ３ 超電導コイル ４，４ａ，４ｂ，４Ｘ，４Ｙ 磁束検出コイル ５，５ａ〜５ｈ 推進コイル ６，６ａ〜６ｏ 浮上コイル ７ 軌道 ８ 比較器 ９ 遅延回路 1 vehicle 2 superconducting magnet 2a orbit side plate 2b groove 2c hole 3 superconducting coil 4,4a, 4b, 4X, 4Y magnetic flux detection coil 5,5a-5h propulsion coil 6,6a-6o levitating coil 7 orbit 8 comparator 9 delay circuit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藤 田 真 史 神奈川県横浜市鶴見区末広町２丁目４番地 株式会社東芝京浜事業所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masashi Fujita 2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Toshiba Keihin Office
Claims (3)
収納された超電導コイルを有し、前記車両の側部の前後
方向に所定の間隔で配置された複数の超電導磁石と、前
記軌道に沿ってその側部に所定の間隔で配置された推進
コイル、及び、上下二つを互いに逆向きに接続した８の
字型の浮上コイルを含んでなる多数の地上コイルとを有
する磁気浮上列車装置の地上コイル異常検出装置におい
て、 前記車両の同じ側部に配置された少なくとも二つの超電
導磁石に対して、前記容器の軌道側側面板の前後面及び
上下面を連ねた外周部に連続して形成された溝と、 前記溝にそれぞれ埋めた状態で巻装された磁束検知コイ
ルと、 二つの前記磁束検知コイルに発生した電圧を比較する比
較手段と、 を備え、前記比較手段の比較結果に基づいて前記地上コ
イルの異常を検出することを特徴とする磁気浮上列車装
置の地上コイル異常検出装置。1. A vehicle and its orbit, a plurality of superconducting magnets having a superconducting coil housed in a container together with a refrigerant, and arranged at predetermined intervals in a front-rear direction of a side portion of the vehicle, and on the orbit. A magnetic levitation train device having a propulsion coil arranged along the side thereof at a predetermined interval, and a plurality of ground coils including an 8-shaped levitation coil in which upper and lower two are connected in opposite directions. In the above ground coil abnormality detection device, at least two superconducting magnets arranged on the same side portion of the vehicle are continuously formed on an outer peripheral portion of front and rear surfaces and upper and lower surfaces of a track side surface plate of the container. And a magnetic flux detecting coil wound in a state of being respectively embedded in the groove, and comparing means for comparing the voltages generated in the two magnetic flux detecting coils, based on a comparison result of the comparing means. The above ground A ground coil abnormality detection device for a magnetic levitation train device, which is characterized by detecting a coil abnormality.
収納された超電導コイルを有し、前記車両の側部の前後
方向に所定の間隔で配置された複数の超電導磁石と、前
記軌道に沿ってその側部に所定の間隔で配置された推進
コイル、及び、上下二つを互いに逆向きに接続した８の
字型の浮上コイルを含んでなる多数の地上コイルとを有
する磁気浮上列車装置の地上コイル異常検出装置におい
て、 前記車両の側部に配置された少なくとも一つの超電導磁
石に対して、前記容器の軌道側側面板の前後面及び上下
面を連ねた外周部に連続して形成された溝と、 前記溝に埋めた状態で巻装された磁束検知コイルと、 前記磁束検知コイルに発生した電圧を入力し、所定の時
間だけ遅延させて出力する遅延手段と、 前記磁束検知コイルに発生した電圧と前記遅延手段の出
力電圧とを比較する比較手段と、 を備え、前記比較手段の比較結果に基づいて前記地上コ
イルの異常を検出することを特徴とする磁気浮上列車装
置の地上コイル異常検出装置。2. A vehicle and its orbit, and a plurality of superconducting magnets each having a superconducting coil housed in a container together with a refrigerant and arranged at predetermined intervals in a front-rear direction of a side portion of the vehicle, and on the orbit. A magnetic levitation train device having a propulsion coil arranged along the side thereof at a predetermined interval, and a plurality of ground coils including an 8-shaped levitation coil in which upper and lower two are connected in opposite directions. In the above ground coil abnormality detecting device, at least one superconducting magnet arranged on a side portion of the vehicle is continuously formed on an outer peripheral portion connecting front and rear surfaces and upper and lower surfaces of a track side surface plate of the container. Groove, a magnetic flux detecting coil wound in a state of being buried in the groove, a delay unit for inputting a voltage generated in the magnetic flux detecting coil, delaying the voltage for a predetermined time and outputting the voltage, and to the magnetic flux detecting coil. Generated voltage and A ground coil abnormality detection device for a magnetic levitation train device, comprising: a comparison unit that compares the output voltage of the delay unit; and a abnormality of the ground coil based on a comparison result of the comparison unit.
収納された超電導コイルを有し、前記車両の側部の前後
方向に所定の間隔で配置された複数の超電導磁石と、前
記軌道に沿ってその側部に所定の間隔で配置された推進
コイル、及び、上下二つを互いに逆向きに接続した８の
字型の浮上コイルを含んでなる多数の地上コイルとを有
する磁気浮上列車装置の地上コイル異常検出装置おい
て、 前記車両の側部に配置された少なくとも一つの超電導磁
石に対して、前記容器の軌道側側面板の前後面及び上下
面を連ねた外周部に連続して形成された溝と、 前記溝が形成された軌道側側面板の前記上下浮上コイル
の中央部に対向する位置に、前後方向に貫通するように
穿たれた孔と、 前記孔を通して前記軌道側側面板の前後面及び上面に形
成された溝に埋めた状態で巻装された第１の磁束検知コ
イルと、 前記孔を通して前記軌道側側面板の前後面及び下面に形
成された溝に埋めた状態で巻装された第２の磁束検知コ
イルと、 を備え、前記第１及び第２の磁束検知コイルに発生した
電圧に基づいて前記浮上コイルの異常を検出することを
特徴とする磁気浮上列車装置の地上コイル異常検出装
置。3. A vehicle and its orbit, and a plurality of superconducting magnets, which have a superconducting coil housed in a container together with a refrigerant, and are arranged at predetermined intervals in the front-rear direction of the side of the vehicle, and on the orbit. A magnetic levitation train device having a propulsion coil arranged along the side thereof at a predetermined interval, and a plurality of ground coils including an 8-shaped levitation coil in which upper and lower two are connected in opposite directions. In the above ground coil abnormality detection device, at least one superconducting magnet arranged on a side portion of the vehicle is continuously formed on an outer peripheral portion connecting front and rear surfaces and upper and lower surfaces of a side plate on a track side of the container. Groove, a hole formed so as to penetrate in the front-rear direction at a position facing the center of the vertical levitation coil of the raceway side surface plate in which the groove is formed, and the raceway side surface plate through the hole. Formed on the front and back surfaces and the upper surface of A first magnetic flux detecting coil wound in a state of being buried in a groove, and a second magnetic flux detecting coil being wound in a state of being buried in a groove formed in the front and rear surfaces and the lower surface of the side plate on the track side through the hole. A coil, and detecting the abnormality of the levitation coil based on the voltage generated in the first and second magnetic flux detecting coils.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00218795A JP3310124B2 (en) | 1995-01-10 | 1995-01-10 | Abnormal ground coil detector for magnetic levitation train equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00218795A JP3310124B2 (en) | 1995-01-10 | 1995-01-10 | Abnormal ground coil detector for magnetic levitation train equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08191507A true JPH08191507A (en) | 1996-07-23 |
| JP3310124B2 JP3310124B2 (en) | 2002-07-29 |
Family
ID=11522367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00218795A Expired - Fee Related JP3310124B2 (en) | 1995-01-10 | 1995-01-10 | Abnormal ground coil detector for magnetic levitation train equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3310124B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015186385A (en) * | 2014-03-25 | 2015-10-22 | 公益財団法人鉄道総合技術研究所 | System and method for measuring ground coil position of magnetic levitation type railway |
| CN112880729A (en) * | 2021-03-26 | 2021-06-01 | 中国人民解放军国防科技大学 | Device and method for detecting performance of absolute position sensor of maglev train |
| CN113936882A (en) * | 2020-07-14 | 2022-01-14 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | Cooling system for suspension propulsion integrated coil |
-
1995
- 1995-01-10 JP JP00218795A patent/JP3310124B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015186385A (en) * | 2014-03-25 | 2015-10-22 | 公益財団法人鉄道総合技術研究所 | System and method for measuring ground coil position of magnetic levitation type railway |
| CN113936882A (en) * | 2020-07-14 | 2022-01-14 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | Cooling system for suspension propulsion integrated coil |
| CN113936882B (en) * | 2020-07-14 | 2024-03-15 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | Cooling system for suspension propulsion integrated coil |
| CN112880729A (en) * | 2021-03-26 | 2021-06-01 | 中国人民解放军国防科技大学 | Device and method for detecting performance of absolute position sensor of maglev train |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3310124B2 (en) | 2002-07-29 |
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