JP5030923B2 - Electromagnet device - Google Patents

Electromagnet device Download PDF

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Publication number
JP5030923B2
JP5030923B2 JP2008288451A JP2008288451A JP5030923B2 JP 5030923 B2 JP5030923 B2 JP 5030923B2 JP 2008288451 A JP2008288451 A JP 2008288451A JP 2008288451 A JP2008288451 A JP 2008288451A JP 5030923 B2 JP5030923 B2 JP 5030923B2
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frame
permanent magnet
electromagnet
magnetic
electromagnet device
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JP2010118375A (en
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竜一 中野
寿博 児玉
潤 山川
伸夫 鈴木
一弘 福島
吉廣 池野
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Meidensha Corp
Fuji Electric Co Ltd
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Meidensha Corp
Fuji Electric Co Ltd
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Priority to JP2008288451A priority Critical patent/JP5030923B2/en
Priority to PCT/JP2009/069115 priority patent/WO2010055827A1/en
Priority to CN200980144788.0A priority patent/CN102217012B/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1607—Armatures entering the winding
    • H01F7/1615—Armatures or stationary parts of magnetic circuit having permanent magnet

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Description

本発明は電磁石装置に係り、特に電磁石に取り付ける永久磁石、及び磁気短絡片を保持するための磁石ホルダーに関するものである。   The present invention relates to an electromagnet device, and more particularly to a permanent magnet attached to an electromagnet and a magnet holder for holding a magnetic short-circuit piece.

一般に、開閉器はその内部に固定電極と可動電極からなる１対の電極を有し、開閉器のオン・オフ制御は電磁石装置の制御によって実行される。電磁石装置は励磁コイルや鉄心、フレームなどによって構成され、励磁コイルに励磁電流を流したときに発生する磁気吸引力により、可動子が固定側に投入される。この投入状態を保持するラッチには、常時励磁、機械的ラッチと磁気的ラッチが知られている。   Generally, a switch has a pair of electrodes including a fixed electrode and a movable electrode inside, and the on / off control of the switch is executed by the control of an electromagnet device. The electromagnet device includes an exciting coil, an iron core, a frame, and the like, and the mover is thrown to the fixed side by a magnetic attractive force generated when an exciting current is passed through the exciting coil. As the latch for holding the input state, a constant excitation, a mechanical latch and a magnetic latch are known.

従来、投入状態を保持するためには、常時、励磁コイルを通電し続ける必要があるために消費電力が無駄となっていた。これを防止する手法として特許文献1が知られている。特許文献1は、励磁コイルの他に永久磁石を設け、永久磁石の磁気的吸引力により投入状態を保持するもので、開閉器が投入状態に移行されると、励磁コイルへの通電を止め、永久磁石の電磁的吸引力によって投入状態を保持して省エネを図ったものである。
特開２００２−８４９８号公報（特に図２） Conventionally, in order to maintain the input state, it is necessary to continuously energize the exciting coil, so power consumption is wasted. Patent Document 1 is known as a technique for preventing this. In Patent Document 1, a permanent magnet is provided in addition to the exciting coil, and the closing state is maintained by the magnetic attractive force of the permanent magnet.When the switch is shifted to the closing state, the energization to the exciting coil is stopped, Energy saving is achieved by maintaining the closing state by the electromagnetic attractive force of the permanent magnet.
JP 2002-8498 A (particularly FIG. 2)

電磁石装置において、フレームと可動子との間に比較的小型な永久磁石を設置して電磁石装置の大型化を抑制し、且つ1台の電磁石装置により常時励磁式にも電磁ラッチ式にも使用できて使いかっての良い電磁石装置が出願人により提案されている。
永久磁石付きの電磁石装置を構成する場合、永久磁石が振動などにより脱落するのを防止するために、組立て時において永久磁石を何らかの手段によって締め付け固定している。永久磁石は、締付による圧力や振動による位置ずれなどにより磁力の低下が早まる問題を有している。 In the electromagnet device, a relatively small permanent magnet is installed between the frame and the mover to suppress the size of the electromagnet device, and it can be used for both the normal excitation type and the electromagnetic latch type with one electromagnet device. Applicants have proposed an electromagnet device that is easy to use.
When configuring an electromagnet device with a permanent magnet, the permanent magnet is clamped and fixed by some means at the time of assembly in order to prevent the permanent magnet from falling off due to vibration or the like. Permanent magnets have a problem that the magnetic force is rapidly lowered due to pressure due to tightening or displacement due to vibration.

よって、本発明が目的とするところは、永久磁石に圧力を掛けずに保持し、且つ振動による位置ずれの生じない電磁石装置を提供することにある。   Therefore, an object of the present invention is to provide an electromagnet device that holds a permanent magnet without applying pressure and does not cause displacement due to vibration.

本発明は、励磁コイル、固定子、及び可動軸に固定された可動子を有する電磁石をフレーム中に収納し、励磁コイルへの通電で形成される磁気回路に永久磁石を配設した電磁石装置において、
前記電磁石装置の左右で、且つフレームと励磁コイルの間に非磁性体よりなる磁石ホルダーを設け、この磁石ホルダーは永久磁石の厚みと同等か、或いはそれより若干厚く枠状に形成されると共に、この磁石ホルダーは、枠状の中心線に沿った一縁に連設されて固定用の孔を有する固定腕と、この固定腕とは中空部を介して上下に対向配置され、一端が前記枠状の一縁に連設され、且つ他端は開放状態に設けられた支持片と、各支持片と前記枠状縁の各対向面に、前記永久磁石と磁気短絡片の何れかが嵌挿される空間を設けたことを特徴としたものである。 The present invention relates to an electromagnet apparatus in which an electromagnet having an excitation coil, a stator, and a mover fixed to a movable shaft is housed in a frame, and a permanent magnet is disposed in a magnetic circuit formed by energizing the excitation coil. ,
A magnet holder made of a non-magnetic material is provided on the left and right of the electromagnet device and between the frame and the excitation coil, and the magnet holder is formed in a frame shape that is equal to or slightly thicker than the thickness of the permanent magnet, The magnet holder is provided with a fixed arm continuously provided on one edge along the frame-shaped center line and having a fixing hole, and the fixed arm is vertically opposed to the fixed arm via a hollow portion. One end of the permanent magnet and one of the magnetic short-circuiting pieces are inserted into each of the support pieces that are connected to one edge of the shape and the other end is opened, and the opposing faces of the support pieces and the frame-like edge. It is characterized by providing a space that can be used.

本発明のフレームには、前記各支持片の開放端が外部から臨まれる位置に切欠きを設けたことを特徴としたものである。   The frame of the present invention is characterized in that a notch is provided at a position where the open end of each support piece faces from the outside.

また、本発明の各支持片の開放端側には、ストッパーを設けたことを特徴としたものである。   In addition, a stopper is provided on the open end side of each support piece of the present invention.

以上のとおり、本発明によれば、磁石ホルダーに形成した空間内に永久磁石や磁気短絡片を嵌挿し保持したものである。これにより、永久磁石は取付けるための締付がなくなり、締付に伴って弱くなる磁力の低下が防止できる。また、永久磁石は、磁石ホルダー空間内に嵌挿された状態となることから、振動による位置ずれ防止が可能となる。
更に、取付けられた磁石ホルダーの支持片の開放端が、外部から臨まれる位置のフレームに開口部を設けることにより、電磁石装置の組立て後に永久磁石や磁気短絡片の入れ替えが容易に実行できるものである。 As described above, according to the present invention, a permanent magnet or a magnetic short-circuit piece is inserted and held in a space formed in the magnet holder. Thereby, there is no fastening for attaching a permanent magnet, and the fall of the magnetic force which becomes weak with fastening can be prevented. In addition, since the permanent magnet is inserted into the magnet holder space, it is possible to prevent displacement due to vibration.
Furthermore, the permanent magnet and the magnetic short-circuiting piece can be easily replaced after the assembly of the electromagnet device by providing an opening in the frame where the open end of the support piece of the attached magnet holder faces from the outside. is there.

図1ないし図３は本発明の構成図で、図1は正面図、図２は図１の側面より見た一部透視図、図３は側面より見た断面図である。各図において、1は両端にねじが螺設された可動軸、２は円筒状に形成された固定子で、この固定子２の穴には可動軸1の一端が貫通される。３は可動軸1に固着された可動子で、この可動子３と固定子2との間には可動子と固定子を常時離間するように遮断ばね4が圧挿されている。５はコイル枠で、固定子2、可動子３、及び遮断ばね4を囲繞し、その枠内には励磁コイル6が巻装される。７はフレームで、一端は有底状をなしたコの字型に形成され、その有底の中心部に孔7ａが穿設されて可動軸1の一端が貫通される。   1 to 3 are structural views of the present invention, FIG. 1 is a front view, FIG. 2 is a partial perspective view seen from the side of FIG. 1, and FIG. 3 is a sectional view seen from the side. In each of the drawings, 1 is a movable shaft having screws screwed at both ends, and 2 is a cylindrically formed stator. One end of the movable shaft 1 is passed through a hole of the stator 2. Reference numeral 3 denotes a mover fixed to the movable shaft 1, and a blocking spring 4 is press-fitted between the mover 3 and the stator 2 so as to always separate the mover and the stator. A coil frame 5 surrounds the stator 2, the mover 3, and the cutoff spring 4, and an excitation coil 6 is wound in the frame. Reference numeral 7 denotes a frame, one end of which is formed in a U-shape having a bottomed shape, and a hole 7a is formed in the center of the bottomed, and one end of the movable shaft 1 is penetrated.

8は、フレームと同様に中心部に孔を有した有底のコの字型に形成された端板、９はフレーム面板（フレーム）で、可動軸１の他端を貫通してフレーム７の反対側より覆い被せ、端板８と後述の磁石ホルダー１０を介在してボルト２１でフレーム７と一体的に固着される。また、フレーム面板９には、磁石ホルダー１０の支持片と永久磁石の保持位置が外部から見える位置に切欠きの開口部が設けられる。
２２は支持筒で、その一端には端板８の孔の縁面が嵌挿される。また、支持筒２２の筒内には可動子３が可動自在に挿入される。２３は止板で、この止板２３とフレーム面板９の内壁間に可動幅Ｌを形成するよう可動軸１にナット２４で固定される。２５は動作表示体、２６は磁石ホルダー１０により保持された永久磁石で、電磁石の磁気回路に挿入されて固定子２と可動子３との接触状態を維持するための磁力を発生する。 8 is an end plate formed in a U-shape with a bottom having a hole in the center as in the case of the frame, and 9 is a frame face plate (frame) which penetrates the other end of the movable shaft 1 and Covering from the opposite side, it is integrally fixed to the frame 7 with bolts 21 with an end plate 8 and a magnet holder 10 described later interposed therebetween. Further, the frame face plate 9 is provided with a notched opening at a position where the holding position of the support piece of the magnet holder 10 and the permanent magnet can be seen from the outside.
22 is a support cylinder, and the edge surface of the hole of the end plate 8 is inserted into one end thereof. Further, the movable element 3 is movably inserted into the cylinder of the support cylinder 22. Reference numeral 23 denotes a stop plate, which is fixed to the movable shaft 1 with a nut 24 so as to form a movable width L between the stop plate 23 and the inner wall of the frame face plate 9. Reference numeral 25 denotes an operation display body, and 26 denotes a permanent magnet held by the magnet holder 10. The permanent magnet is inserted into the magnetic circuit of the electromagnet and generates a magnetic force for maintaining the contact state between the stator 2 and the mover 3.

図４は磁石ホルダー１０を示したもので、枠状に形成されている。磁石ホルダー１０は樹脂（プラスチック）よりなって永久磁石と磁気短絡片を保持するもので、枠１１の一縁には、中心線に沿った位置に固定腕１２が連設され、固定腕１２の先端位置には孔１２ａが設けられる。１４（１４ａ，１４ｂ）は支持片で、固定腕１２とは中空部１３を介して対向する位置に突設され、その開放された先端にはストッパー１５が設けられる。また、枠１１を構成する上下の各縁と各支持片１４間には高さｈ１とｈ２を有する空間１６（１６ａ，１６ｂ）が設けられる。これにより、支持片１４は枠１１と連設された側を支点として中心線方向にばね特性が形成される。空隙１６の高さｈ１の位置には永久磁石２６が嵌挿され、また、空隙１６の高さｈ１からｈ２の範囲には磁気短絡片２７が嵌挿される。ここでは空隙１６ａに永久磁石２６が、空隙１６ｂには磁気短絡片２７が嵌挿されているが、この嵌挿位置は用途により任意に選択される。
空間１６に永久磁石２６、或いは磁気短絡片２７の何れかが嵌め込まれることにより、磁石ホルダー１０は中心線を挟んで同形に形成される。また、磁石ホルダー１０の厚みは、永久磁石２６の厚みと同等か、或いはそれより若干厚く形成されて永久磁石に取付けによる圧力がかからないように構成され、圧力による永久磁石２６の特性変化を防止している。
なお、枠１１の切り欠き１１ａ，１１ｂは固定ボルトの貫通用である。 FIG. 4 shows the magnet holder 10, which is formed in a frame shape. The magnet holder 10 is made of resin (plastic) and holds a permanent magnet and a magnetic short-circuit piece. A fixed arm 12 is continuously provided at one edge of the frame 11 at a position along the center line. A hole 12a is provided at the tip position. Reference numerals 14 (14a, 14b) denote support pieces, which protrude from a position facing the fixed arm 12 through the hollow portion 13, and a stopper 15 is provided at the opened tip. A space 16 (16a, 16b) having heights h1 and h2 is provided between the upper and lower edges constituting the frame 11 and the support pieces 14. As a result, the support piece 14 has a spring characteristic in the direction of the center line with the side connected to the frame 11 as a fulcrum. A permanent magnet 26 is inserted and inserted into the gap 16 at a height h 1, and a magnetic short-circuit piece 27 is inserted into the gap 16 in the range of heights h 1 to h 2. Here, the permanent magnet 26 is inserted into the gap 16a, and the magnetic short-circuit piece 27 is inserted into the gap 16b. The insertion position is arbitrarily selected depending on the application.
By inserting either the permanent magnet 26 or the magnetic short-circuit piece 27 into the space 16, the magnet holder 10 is formed in the same shape with the center line interposed therebetween. Further, the thickness of the magnet holder 10 is equal to or slightly thicker than that of the permanent magnet 26 so that no pressure is applied to the permanent magnet due to the mounting, thereby preventing changes in the characteristics of the permanent magnet 26 due to the pressure. ing.
In addition, the notches 11a and 11b of the frame 11 are for penetration of fixing bolts.

磁石ホルダー１０は、図１で示すように電磁石の左右に配置される。その際、固定腕１２の孔１２ａにはボルト２１が貫通され、ボルト２１は端板８に設けられたねじと螺合することにより固定される。また、磁石ホルダーの切り欠き１１ａ，１１ｂには他の固定ボルトが貫通される。電磁石に取り付けられた磁石ホルダー１０は、電磁石の正面側から見ると支持片１４ａ，１４ｂの先端が見える状態となり、その支持片１４ａ，１４ｂの先端を中心線方向に屈曲することで、外部から永久磁石２６と磁気短絡片２７の空隙１６ａ，１６ｂへの取付け、取外しが容易に可能となる。また、永久磁石２６と磁気短絡片２７の入替えにより磁気的吸引力の調整ができ、結果として1台の電磁石装置で常時励磁用と電磁ラッチ用への適宜な適用切替えが可能となって2通りに使用できる。取付けられた永久磁石２６、磁気短絡片２７は、支持片１４ａ，１４ｂの復元力とストッパー１５により振動などによって脱落することはない。   The magnet holder 10 is arrange | positioned at the right and left of an electromagnet, as shown in FIG. At that time, a bolt 21 is passed through the hole 12 a of the fixed arm 12, and the bolt 21 is fixed by screwing with a screw provided on the end plate 8. Further, other fixing bolts are passed through the notches 11a and 11b of the magnet holder. When viewed from the front side of the electromagnet, the magnet holder 10 attached to the electromagnet is in a state where the tips of the support pieces 14a and 14b can be seen, and the tips of the support pieces 14a and 14b are bent in the direction of the center line, so The magnet 26 and the magnetic short-circuit piece 27 can be easily attached to and removed from the gaps 16a and 16b. In addition, the magnetic attraction force can be adjusted by switching the permanent magnet 26 and the magnetic short-circuit piece 27. As a result, one electromagnet device can be appropriately switched between normal excitation and electromagnetic latching in two ways. Can be used for The attached permanent magnet 26 and magnetic short-circuit piece 27 will not fall off due to vibration or the like due to the restoring force of the support pieces 14 a and 14 b and the stopper 15.

以上のように構成された電磁石装置において、励磁コイル６に電流が流れてないときには、遮断バネ４の反発力により可動軸１に固定された止板２３は鎖線で示すようにフレーム面板９の内壁と当接し、固定子２と可動子３は開離れた状態で可動軸１に連結される開閉器は遮断状態となっている。遮断状態における永久磁石２６からの磁束は、永久磁石２６→端板８→支持筒２２→可動子３→止板２３→フレーム面板９→フレーム７→永久磁石２６で形成される磁気回路を流れる。   In the electromagnet apparatus configured as described above, when no current flows through the exciting coil 6, the stop plate 23 fixed to the movable shaft 1 by the repulsive force of the cutoff spring 4 is the inner wall of the frame face plate 9 as shown by the chain line. The switch connected to the movable shaft 1 in a state where the stator 2 and the movable element 3 are separated from each other is in a cut-off state. The magnetic flux from the permanent magnet 26 in the interrupted state flows through a magnetic circuit formed by the permanent magnet 26 → the end plate 8 → the support cylinder 22 → the movable element 3 → the stop plate 23 → the frame face plate 9 → the frame 7 → the permanent magnet 26.

次に、励磁コイル６に電流が流れると磁束φが発生し、その磁束はフレーム７→永久磁石２６→端板８→支持筒２２→可動子３及び固定子２で形成される磁気回路を流れる。その際における磁束は、励磁コイル６によって発生するものと永久磁石２６で発生する磁束の和であって、和の磁束による磁気的吸引力により可動子３は遮断バネ４に抗して固定子２に吸引され、その状態を保持する。可動軸１も可動子３と共に移動することで開閉器は投入状態となる。   Next, when a current flows through the exciting coil 6, a magnetic flux φ is generated, and the magnetic flux flows through a magnetic circuit formed by the frame 7 → the permanent magnet 26 → the end plate 8 → the support cylinder 22 → the movable element 3 and the stator 2. . The magnetic flux at that time is the sum of the magnetic flux generated by the exciting coil 6 and the magnetic flux generated by the permanent magnet 26, and the mover 3 resists the shut-off spring 4 by the magnetic attraction force by the total magnetic flux, and the stator 2. Is sucked in and keeps its state. When the movable shaft 1 also moves together with the movable element 3, the switch is turned on.

以上のように構成された本発明の実施例によれば、電磁石装置に用いられる永久磁石や磁気短絡片は磁石ホルダーの空間に嵌挿保持されるため、振動によって位置がずれることはなく、且つ永久磁石固定のための圧力はかからないことから、磁気特性の変化を防止することができる。また、永久磁石や磁気短絡片を保持する支持片の可動端を、電磁石装置の前面位置より操作可能としたことにより、永久磁石と磁気短絡片の入替えによる磁気的吸引力の調整が外部から容易に可能となる。また、永久磁石と磁気短絡片の磁石ホルダーへの取付け、取外しに際しては、永久磁石の吸引力以外にはかからないので、楽にできるものである。   According to the embodiment of the present invention configured as described above, the permanent magnet and the magnetic short-circuit piece used in the electromagnet device are inserted and held in the space of the magnet holder, so that the position does not shift due to vibration, and Since no pressure is applied to fix the permanent magnet, it is possible to prevent changes in magnetic characteristics. In addition, the movable end of the support piece that holds the permanent magnet and magnetic short-circuit piece can be operated from the front position of the electromagnet device, making it easy to adjust the magnetic attractive force by replacing the permanent magnet and magnetic short-circuit piece from the outside. It becomes possible. In addition, when the permanent magnet and the magnetic short-circuiting piece are attached to and detached from the magnet holder, it can be easily done because it does not apply other than the attractive force of the permanent magnet.

本発明の実施例を示す電磁石装置の正面図。The front view of the electromagnet apparatus which shows the Example of this invention. 本発明の実施例を示す電磁石装置の一部透視の側面図。The side view of the partial see-through | perspective view of the electromagnet apparatus which shows the Example of this invention. 本発明の実施例を示す電磁石装置の断面図。Sectional drawing of the electromagnet apparatus which shows the Example of this invention. 本発明に使用される磁石ホルダーの構成図。The block diagram of the magnet holder used for this invention.

符号の説明Explanation of symbols

１… 可動軸
２… 固定子
３… 可動子
４… 遮断バネ
５… コイル枠
６… 励磁コイル
７… フレーム
８… 端板
９… フレーム（フレーム面板）
１０… 磁石ホルダー
１１… 枠
１２… 固定腕
１４… 支持片
２６… 永久磁石
２７… 磁気短絡片 DESCRIPTION OF SYMBOLS 1 ... Movable shaft 2 ... Stator 3 ... Movable element 4 ... Shut-off spring 5 ... Coil frame 6 ... Excitation coil 7 ... Frame 8 ... End plate 9 ... Frame (frame face plate)
DESCRIPTION OF SYMBOLS 10 ... Magnet holder 11 ... Frame 12 ... Fixed arm 14 ... Supporting piece 26 ... Permanent magnet 27 ... Magnetic short-circuiting piece

Claims (3)

励磁コイル、固定子、及び可動軸に固定された可動子を有する電磁石をフレーム中に収納し、励磁コイルへの通電で形成される磁気回路に永久磁石を配設した電磁石装置において、
前記電磁石装置の左右で、且つフレームと励磁コイルの間に非磁性体よりなる磁石ホルダーを設け、この磁石ホルダーは永久磁石の厚みと同等か、或いはそれより若干厚く枠状に形成されると共に、この磁石ホルダーは、枠状の中心線に沿った一縁に連設されて固定用の孔を有する固定腕と、この固定腕とは中空部を介して上下にそれぞれ対向配置され、その一端は前記枠状の一縁に連設され、他端は開放状態に設けられた支持片と、各支持片と前記枠状縁の各対向面に、永久磁石と磁気短絡片の何れかが嵌挿される空間を設けたことを特徴とする電磁石装置。 In an electromagnet apparatus in which an electromagnet having an excitation coil, a stator, and a mover fixed to a movable shaft is housed in a frame, and a permanent magnet is disposed in a magnetic circuit formed by energizing the excitation coil.
A magnet holder made of a non-magnetic material is provided on the left and right of the electromagnet device and between the frame and the excitation coil, and the magnet holder is formed in a frame shape that is equal to or slightly thicker than the thickness of the permanent magnet, This magnet holder is arranged on one edge along the frame-shaped center line and has a fixing arm having a fixing hole, and this fixing arm is arranged to face each other vertically through a hollow portion, one end of which is One of the permanent magnet and the magnetic short-circuiting piece is inserted into each of the support pieces that are connected to one edge of the frame shape and the other end is open, and the opposing surfaces of the support pieces and the frame shape edge. An electromagnet device characterized in that a space is provided. 前記フレームに、前記各支持片の開放端が外部から臨まれる位置に切欠き開口部を設けたことを特徴とする請求項１記載の電磁石装置。 2. The electromagnet device according to claim 1, wherein the frame is provided with a notch opening at a position where the open end of each support piece faces from the outside. 前記各支持片の開放端側に、ストッパーを設けたことを特徴とする請求項１又は２記載の電磁石装置。 The electromagnet device according to claim 1, wherein a stopper is provided on an open end side of each support piece.
JP2008288451A 2008-11-11 2008-11-11 Electromagnet device Active JP5030923B2 (en)

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PCT/JP2009/069115 WO2010055827A1 (en) 2008-11-11 2009-11-10 Electromagnetic device
CN200980144788.0A CN102217012B (en) 2008-11-11 2009-11-10 Electromagnetic device

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CN108265417A (en) * 2018-03-30 2018-07-10 苏州胜璟电磁科技有限公司 A kind of use in sewing machine electromagnet

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JPS62273704A (en) * 1986-05-21 1987-11-27 Kamiya Denshi Kogyo Kk Oscillating rotary actuator with side holder
JPH0221606A (en) * 1988-07-08 1990-01-24 Matsushita Electric Works Ltd Electromagnet device
CN2425414Y (en) * 2000-04-29 2001-03-28 山东省三环制锁集团公司 Pulse self-holding electromagnet
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* Cited by examiner, † Cited by third party
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