JP2007137661A - Lifting magnet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lifting magnet capable of releasing Joule heat generated in a coil efficiently. <P>SOLUTION: This lifting magnet 1 is provided with the coil 20, a case 10 for storing the coil 20, heat conducting plates 31 to 34 arranged on each inner face of the case 10 along an end face 20a, an inner side face 20b, an outer side face 20c, and an end face 20d of the coil 20, respectively, and a fixing member 40 provided between the coil 20 and the case 10 to fix the coil 20 in the case 10. The heat conducting plates 31 to 34 are made of an electrical conductive material which has higher thermal conductivity than that of the fixing member 40 and in which insulation treatment is applied on a face opposing to the coil 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lifting magnet (a lifting electromagnet).

  A lifting magnet is a device for lifting and transporting a steel material or the like by the magnetic force of an electromagnet. When the coil of the lifting magnet is excited, Joule heat is generated, and the internal temperature of the coil rises with time of use. This Joule heat is transmitted to the case that houses the coil, and is released to the outside from the case. In a general lifting magnet, the gap between the coil and the case is filled with a resin such as epoxy to ensure insulation between the coil and the case, and the coil is fixed in the case.

  Patent Document 1 shows an example of a lifting electromagnet (lifting magnet) having the above-described configuration. FIG. 7 is a side sectional view showing the structure of this lifting electromagnet. Referring to FIG. 7, the lifting electromagnet 100 includes a case 101, excitation coils 102 a to 102 c housed inside the case 101, a heat conductor 103 a disposed between the excitation coils 102 a and 102 b, and an excitation coil 102 b. And 102c, and a heat conductor 103c disposed on the inner surface of the case 101 so as to face the upper surfaces of the exciting coils 102a to 102c. An insulator 104 is filled in the gap between the case 101 and the exciting coils 102a to 102c.

Japanese Utility Model 5-5786

  However, the lifting magnet having the above-described configuration has the following problems. Usually, the thermal conductivity of a resin such as epoxy is extremely low compared to a metal coil or case. On the other hand, in order to ensure insulation between the coil and the case, it is necessary to form the resin with a sufficient thickness. Therefore, heat conduction from the coil to the case is hindered by the resin, and Joule heat generated in the coil cannot be efficiently released. As the coil temperature rises, the resistivity of the coil increases, leading to a decrease in excitation current, that is, a decrease in magnetic force.

  In the lifting electromagnet 100 disclosed in Patent Document 1, the Joule heat generated in the excitation coils 102a to 102c is released through the heat conductors 103a and 103b disposed between the excitation coils 102a to 102c. . Thereby, it is going to discharge | release the heat | fever accumulate | stored inside the exciting coils 102a-102c efficiently. However, a metal material is assumed as the heat conductor as described in the literature that the heat conductors 103a and 103b and the heat conductor 103c are fixed by means such as welding. Therefore, there is no change in the necessity of ensuring insulation between the heat conductor and the coil with a sufficiently thick resin.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a lifting magnet that can efficiently release Joule heat generated in a coil.

  In order to solve the above-described problems, a lifting magnet according to the present invention includes a coil, a case that houses the coil, a heat conducting plate disposed between the case and the coil, and a fixing material that fixes the coil in the case. And the heat conducting plate is made of a conductive material having a higher thermal conductivity than the fixing material and an insulating treatment applied to a surface facing the coil, or an insulating material having a higher thermal conductivity than the fixing material. And

  In the above-described lifting magnet, a heat conducting plate having a higher thermal conductivity than the fixing material for fixing the coil in the case is disposed between the case and the coil, and the heat conducting plate faces the coil. The surface is made of a conductive material having an insulating treatment or an insulating material. By disposing such a heat conducting plate between the case and the coil, it is possible to ensure insulation between the case and the coil without depending on the fixing material. Thereby, since it becomes possible to make the fixing material for fixing a coil into a very thin film form, the Joule heat of a coil can be efficiently transmitted to a case via a heat conducting plate. Therefore, according to the above-described lifting magnet, the Joule heat generated in the coil can be released more efficiently than in the conventional structure.

  Further, the lifting magnet may be characterized in that the heat conducting plate is made of a conductive material having an insulation treatment applied to a surface facing the coil, and the conductive material is exposed on the surface facing the case. Taking a metal as an example of the conductive material, when the surface is subjected to insulation treatment (for example, oxidation treatment), the thermal conductivity of the insulation treatment portion tends to decrease. Therefore, by exposing the conductive material on the surface of the heat conducting plate facing the case, the thermal conductivity between the heat conducting plate and the case can be improved, and Joule heat can be released more efficiently.

  The lifting magnet may further include a rubbing prevention material provided between the coil and the heat conducting plate. Thereby, rubbing between the coil and the heat conducting plate due to use over time can be prevented, and the reliability of the lifting magnet can be improved. In particular, when the heat conducting plate is made of a conductive material that is subjected to insulation treatment on the surface facing the coil, the insulation treatment surface can be suitably protected by preventing the coil and the heat conducting plate from rubbing.

  The lifting magnet is formed by winding a coiled plate-shaped conductor having a width over both ends of the coil, and the heat conducting plate is disposed between at least one end of the coil and the case. It may be characterized by being. Normally, the conductive wire of the coil is covered with an insulating film, but generally the thermal conductivity of the insulating film is smaller than that of the conductive wire. According to this lifting magnet, since the conductor (conductive wire) constituting the coil is a plate having a width extending across both ends of the coil, the thermal conductivity in the winding axis direction of the coil can be improved, and Joule heat can be released more efficiently. .

  Further, the lifting magnet may be characterized in that the heat conducting plate is made of an aluminum plate having an alumite treatment on a surface facing the coil. Accordingly, it is possible to suitably realize a heat conducting plate made of a conductive material (aluminum) having a thermal conductivity higher than that of the fixing material and having an insulating treatment (alumite treatment) applied to the surface facing the coil.

  According to the lifting magnet of the present invention, the Joule heat generated in the coil can be efficiently released.

  Hereinafter, embodiments of a lifting magnet according to the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  Fig.1 (a) is side sectional drawing which shows the structure of one Embodiment of the lifting magnet by this invention. In addition, the lifting magnet of this embodiment has a cylindrical appearance centering on the axis C, and illustration of a cross section on one side with respect to the axis C is omitted in FIG.

  Referring to FIG. 1A, the lifting magnet 1 of the present embodiment includes a case 10, a coil 20, heat conducting plates 31 to 34, and a fixing member 40. Here, FIG. 1B is an enlarged view showing the cross-sectional structure of the coil 20 in detail. The coil 20 is formed by winding a conducting wire 21 around a central axis C across a plurality of layers. The conducting wire 21 is made of a conductive material such as aluminum, and is covered with an insulating coating film 22 such as insulating paper.

  The case 10 is a member for housing the coil 20. The case 10 includes a yoke 11 as a top plate disposed on one end side of the coil 20, an inner pole 12 disposed on the inner side of the coil 20, an outer pole 13 disposed on the outer side of the coil 20, and the coil 20. And a bottom plate 14 disposed on the other end side. The yoke 11, the inner pole 12, and the outer pole 13 are each made of a magnetic material such as iron.

  The inner pole 12 is a rod-shaped member that extends in the winding axis direction of the coil 20 along the inner side surface 20 b of the coil 20 (that is, the direction along the central axis C), and constitutes an electromagnet together with the coil 20. That is, when an exciting current flows through the coil 20, a magnetic field is formed inside the inner pole 12, and the end 12a of the inner pole 12 becomes one pole of the electromagnet. The outer pole 13 is a cylindrical member that extends in the winding axis direction of the coil 20 along the outer surface 20 c of the coil 20. When an exciting current flows through the coil 20, a magnetic field is formed inside the outer pole 13, and the end 13a of the outer pole 13 becomes the other pole of the electromagnet.

  The yoke 11 is a disk-shaped member provided along the end surface 20 a of the coil 20. One end of the inner pole 12 is fixed to the central portion of the yoke 11, and one end of the outer pole 13 is fixed near the outer peripheral portion of the yoke 11. When an exciting current flows through the coil 20, the magnetic field lines pass through the inside of the yoke 11. Thereby, a magnetic field can be efficiently generated at the end portions 12 a and 13 a of the inner pole 12 and the outer pole 13. The bottom plate 14 is a disk-shaped member provided along the end surface 20 d of the coil 20.

  Case 10 has an inner surface (that is, a lower surface of yoke 11) along end surface 20 a of coil 20. Further, the case 10 has an inner surface (that is, a side surface of the inner pole 12) along the inner surface 20b of the coil 20. The case 10 has an inner surface (that is, an inner surface of the outer pole 13) along the outer surface 20c of the coil 20. The case 10 has an inner surface (that is, an upper surface of the bottom plate 14) along the end surface 20d of the coil 20.

  The heat conducting plates 31 to 34 are members for transmitting Joule heat generated in the coil 20 to the case 10 and insulating the coil 20 and the case 10 from each other. The heat conducting plates 31 to 34 are disposed between the case 10 and the coil 20. Specifically, the heat conducting plate 31 is formed in a disc shape centered on the axis C, and is disposed on the inner surface of the case 10 (the lower surface of the yoke 11) along the end surface 20 a of the coil 20. The heat conducting plate 32 is formed in a cylindrical shape centered on the axis C, and is disposed on the inner surface of the case 10 (side surface of the inner pole 12) along the inner surface 20 b of the coil 20. The heat conducting plate 33 is formed in a cylindrical shape centered on the axis C, and is disposed on the inner surface of the case 10 (the inner surface of the outer pole 13) along the outer surface 20 c of the coil 20. Further, the heat conducting plate 34 is formed in a disc shape centered on the axis C, and is disposed on the inner surface of the case 10 (the upper surface of the bottom plate 14) along the end surface 20 d of the coil 20.

  The fixing member 40 is a member for fixing the coil 20 in the case 10 by filling the gap between the coil 20 and the case 10 and solidifying it. The fixing member 40 is made of, for example, a resin material such as an epoxy resin, and is mainly provided between the coil 20 and the heat conducting plates 31 to 34 in this embodiment. In addition, the part provided between the coil 20 and the heat conducting plates 31 to 34 in the fixing member 40 is compared with the distance between the surface of the coil 20 and the inner surface of the case 10 and the thickness of the heat conducting plates 31 to 34. It is formed into a very thin film (for example, a thickness of 1 mm to 2 mm).

  Here, FIG. 2 is an enlarged view showing a detailed cross-sectional structure of the heat conducting plate 31. Referring to FIG. 2, the heat conducting plate 31 includes a substrate 31a and an insulating treatment layer 31b formed on the surface of the substrate 31a. The substrate 31a is made of a material having a higher thermal conductivity than the fixing material 40, for example, a metal material such as aluminum. The insulating treatment layer 31b is a layer for ensuring insulation between the coil 20 and the case 10 (yoke 11), and is provided because the substrate 31a of the present embodiment is a conductive material. The insulating treatment layer 31 b is formed on the surface 31 c on the side of the heat conducting plate 31 facing the coil 20. The insulating treatment layer 31b of this embodiment is formed by subjecting the surface of the substrate 31a to an oxidation treatment. For example, when the substrate 31a is made of aluminum, the insulating treatment layer 31b is made of alumite.

  In addition, on the surface 31d of the heat conducting plate 31 on the side facing the inner surface of the case 10 (yoke 11), the insulating treatment layer is not provided and the substrate 31a is exposed. When the substrate 31a is made of metal and the insulating treatment layer 31b is formed by oxidation treatment, an oxide film may be formed except for the surface 31d on the side facing the inner surface of the case 10 in the manufacturing process.

  Note that the heat conducting plates 32 to 34 also have the same cross-sectional structure as the heat conducting plate 31. That is, each of the heat conducting plates 32 to 34 includes a substrate and an insulating treatment layer formed on the substrate surface facing the coil 20. And the board | substrate surface is exposed in the surface of the heat-conducting plates 32-34 on the side facing the case 10. FIG. Further, the heat conducting plates 31 to 34 are not limited to the above configuration, and may be configured by a substrate made of an insulating material (for example, high thermal conductivity / insulating ceramic (eg, aluminum nitride)) having a higher thermal conductivity than the fixing material 40. Good. In this case, the above-described insulating treatment layer is not necessary.

  In the lifting magnet 1 of the present embodiment, the heat conducting plates 31 to 34 having higher heat conductivity than the fixing material 40 are disposed between the case 10 and the coil 20, and the heat conducting plates 31 to 34 are coiled. The surface facing 20 is made of an electrically conductive material or an insulating material. By disposing such heat conducting plates 31 to 34 between the case 10 and the coil 20, it is possible to ensure insulation between the case 10 and the coil 20 without depending on the fixing material 40. Thereby, since it becomes possible to make the fixing material 40 for fixing the coil 20 into a very thin film shape, the Joule heat of the coil 20 can be efficiently transmitted to the case 10 through the heat conducting plates 31 to 34. . Therefore, according to the lifting magnet 1 of the present embodiment, the Joule heat generated in the coil 20 can be released more efficiently compared to the conventional structure in which the case and the coil are insulated only by the resin layer. And the temperature rise of the coil 20 can be suppressed low, and the fall width of the magnetic force by long-time use can be made smaller.

  Further, as in the present embodiment, when the heat conducting plates 31 to 34 are made of a conductive material that has been subjected to insulation treatment on the surface facing the coil 20, the conductive material is exposed on the surface facing the case 10. Preferably it is. For example, when a metal material is used as the conductive material, if the surface is subjected to an insulation treatment such as an oxidation treatment, the thermal conductivity of the insulation-treated portion tends to decrease. For example, when aluminum is used as the conductive material, the thermal conductivity of aluminum is about 240 W / m · K, whereas the alumite produced by the oxidation treatment is about 60 to 80 W / m · K. is there. Further, the insulation between the case 10 and the coil 20 is sufficiently ensured by an insulating treatment layer (for example, 31b) provided on the surface on the side facing the coil 20. Accordingly, the insulating material is not applied on the surface of the heat conducting plates 31 to 34 on the side facing the case 10 and the conductive material is exposed, so that the thermal conductivity between the heat conducting plates 31 to 34 and the case 10 is improved, Heat can be released more efficiently.

  Further, as in the present embodiment, the heat conducting plates 31 to 34 are preferably made of an aluminum plate whose surface facing the coil 20 is anodized. Anodized has a high voltage resistance of several hundred volts even if it is an extremely thin film having a thickness of 10 μm or less, and has a thermal conductivity nearly 100 times that of an epoxy resin. Therefore, when the heat conducting plates 31 to 34 have such a configuration, it is possible to efficiently release the Joule heat generated in the coil 20 while improving the insulation between the coil 20 and the case 10.

  In the lifting magnet 1 of the present embodiment, the heat conducting plates 31 to 34 are disposed on the inner surfaces of the case 10 along the end surface 20a, the inner surface 20b, the outer surface 20c, and the end surface 20d of the coil 20, respectively. However, when the heat conducting plate is disposed on at least one of the inner surfaces of the case 10 along the end surface 20a, the inner surface 20b, the outer surface 20c, and the end surface 20d of the coil 20, the above-described effects can be preferably obtained. Can do.

(First modification)
Fig.3 (a) is side surface sectional drawing which shows the structure of the lifting magnet 2 which concerns on the 1st modification of the said embodiment. The difference between the lifting magnet 2 of the present modification and the lifting magnet 1 of the above embodiment is the number of coils and the arrangement of the heat conducting plates. That is, the lifting magnet 2 of the present modification includes two coils 23 and 24 instead of the coil 20 of the above embodiment. Moreover, the lifting magnet 2 of this modification is further provided with the heat-conducting plate 35 in addition to the heat-conducting plates 31-34 of the said embodiment.

  The coil 23 is provided closer to the inner pole 12 in the case 10, and the coil 24 is provided closer to the outer pole 13 in the case 10. In other words, the coil 23 is formed by winding the conductive wire around the inner pole 12, and the coil 24 is formed by winding the conductive wire along the outer periphery of the coil 23. Since the cross-sectional structures of the coils 23 and 24 are the same as those of the coil 20 (see FIG. 1B) of the above embodiment, detailed description thereof is omitted.

  The heat conducting plate 35 is formed in a cylindrical shape with the axis C as the center, and is disposed between the outer surface of the coil 23 and the inner surface of the coil 24. Further, the fixing member 40 of this modification is also provided between the coil 23 and the heat conducting plate 35 and between the coil 24 and the heat conducting plate 35. The fixing member 40 fixes these members in the case 10 by filling the gaps between the coil 23 and the heat conducting plate 35 and between the heat conducting plate 35 and the coil 24. The surface of the heat conducting plate 35 that faces the outer surface of the coil 23 and the surface of the heat conducting plate 35 that faces the inner surface of the coil 24 are subjected to the same insulating treatment as the insulating treatment layer 31b of the above embodiment. Both ends of the heat conducting plate 35 are in contact with the heat conducting plates 31 and 34, respectively. In addition, in this modification, the heat-conducting plates 31-34 are provided in the same position as the said embodiment.

  When the plurality of coils 23 and 24 are arranged in the radial direction as in the present modification, the lifting magnet 2 preferably includes a heat conducting plate 35 between the coils 23 and 24. Normally, the conductor of the coil is covered with an insulating film as shown in FIG. 1B. Generally, the thermal conductivity of the insulating film is smaller than that of the conductor, so Joule heat accumulates in the center of the coil. Easy to do. According to this modification, since the heat conducting plate 35 is arranged so as to divide the central portion of the coil, the heat inside the coil can be released more efficiently.

(Second modification)
FIG. 3B is a side cross-sectional view showing the configuration of the lifting magnet 3 according to the second modification of the embodiment. The difference between the lifting magnet 3 of this modification and the lifting magnet 1 of the above embodiment is the number of coils and the arrangement of the heat conducting plates. That is, the lifting magnet 3 of this modification includes two coils 25 and 26 instead of the coil 20 of the above embodiment. Further, the lifting magnet 3 of the present modification further includes a heat conducting plate 36 in addition to the heat conducting plates 31 and 34 of the above embodiment.

  The coil 25 is provided near the yoke 11 in the case 10, and the coil 26 is provided near the bottom plate 14 in the case 10. In other words, the coils 25 and 26 are arranged side by side in the direction along the central axis C. The cross-sectional structures of the coils 25 and 26 are the same as those of the coil 20 of the above embodiment (see FIG. 1B).

  The heat conducting plate 36 is formed in a disc shape centered on the axis C, and is disposed between the coil 25 and the coil 26. Further, the fixing member 40 of this modification is also provided between the coil 25 and the heat conducting plate 36 and between the coil 26 and the heat conducting plate 36. The fixing member 40 fixes these members in the case 10 by filling the gaps between the coil 25 and the heat conducting plate 36 and between the heat conducting plate 36 and the coil 26. The surface of the heat conducting plate 36 facing the coil 25 and the surface of the heat conducting plate 36 facing the coil 26 are subjected to the same insulating treatment as the insulating treatment layer 31b of the above embodiment. It is more preferable that the inner peripheral portion and the outer peripheral portion of the heat conducting plate 36 are in contact with the inner pole 12 and the outer pole 13, respectively, and are fitted in the inner pole 12 and the outer pole 13, respectively, as shown in FIG. It is. In addition, in this modification, as shown in FIG.3 (b), you may omit the heat conductive plates 32 and 33 of the said embodiment.

  Not only the first modification but also the configuration of the lifting magnet 3 according to this modification, the heat inside the coil can be released more efficiently. Further, since the inner peripheral portion and the outer peripheral portion of the heat conducting plate 36 are fitted into the inner pole 12 and the outer pole 13, respectively, the contact degree between the heat conducting plate 36, the inner pole 12 and the outer pole 13 can be further increased. The heat release efficiency inside the coil is further improved.

(Third Modification)
FIG. 4 is a side sectional view showing the configuration of the lifting magnet 4 according to a third modification of the embodiment. The differences between the lifting magnet 4 of the present modification and the lifting magnet 1 of the above embodiment are the cross-sectional structure of the coil and the arrangement of the heat conducting plates. The lifting magnet 4 of this modification includes a coil 50 instead of the coil 20 of the above embodiment. Further, the lifting magnet 4 does not include the heat conducting plates 32 and 33 of the above embodiment.

  The coil 50 of this modification is formed by winding a plate-like conductor (for example, an aluminum plate) 51 having a width extending between the end face 50a and the end face 50b of the coil 50 around the central axis C. The conductor 51 is covered with an insulating coating film 52 such as insulating paper. In addition, in the coil 50, in order to maintain the winding number similar to the coil 20 of the said embodiment, it is preferable to form the plate-shaped conductor 51 thinly. Further, in this modification, heat conducting plates 31 and 34 are arranged between the end surface 50a of the coil 50 and the yoke 11 of the case 10 and between the end surface 50b of the coil 50 and the bottom plate 14 of the case 10, respectively. Yes.

  As described above, the conductor of the coil is usually covered with an insulating film as shown in FIG. 1B, and generally the thermal conductivity of the insulating film is smaller than that of the conductor. Easily accumulates Joule heat. According to this modification, the conductor (conductive wire) 51 constituting the coil 50 is a plate having a width extending between the end surface 50a and the end surface 50b, so that the thermal conductivity in the winding axis direction of the coil 50 is increased, and the heat conductive plate Joule heat can be released more efficiently via 31 and 34. Moreover, since sufficient heat radiation efficiency is obtained even if the heat conducting plate between the inner side surface 50c of the coil 50 and the case 10 and between the inner side surface 50d of the coil 50 and the case 10 is omitted, a lifting magnet is obtained. 4 can be configured to be lightweight. In this modification, the heat conducting plates 31 and 34 are provided between the end surface 50a of the coil 50 and the yoke 11 and between the end surface 50b of the coil 50 and the bottom plate 14, but the heat conducting plates 31 and 34 are provided. The effect mentioned above can be suitably acquired by providing either one of them.

(Fourth modification)
FIG. 5 is a side sectional view showing a configuration of a lifting magnet 5 according to a fourth modification of the above embodiment. The main difference between the lifting magnet 5 of this modification and the lifting magnet 1 of the above embodiment is the arrangement of the heat conducting plate. The lifting magnet 5 of this modification includes heat conducting plates 61 to 64 instead of the heat conducting plates 31 to 34 of the above embodiment.

  The heat conducting plate 61 of this modification is formed in a disc shape centered on the axis C, and is disposed on the end face 20 a of the coil 20. Further, the heat conducting plate 62 is formed in a cylindrical shape centered on the axis C, and is disposed on the inner side surface 20 b of the coil 20. The heat conducting plate 63 is formed in a cylindrical shape centered on the axis C, and is disposed on the outer surface 20 c of the coil 20. Further, the heat conducting plate 64 is formed in a disc shape with the axis C as the center, and is disposed on the end surface 20 d of the coil 20.

  The fixing member 70 is a member for fixing the coil 20 in the case 10 by filling the gap between the coil 20 and the case 10 and solidifying it. The fixing material 70 is made of, for example, a resin material such as an epoxy resin, and is mainly provided between the heat conducting plates 61 to 64 and the case 10 in this modification. In addition, the part provided between the case 10 and the heat-conducting plates 61-64 among the fixing materials 70 of this modification is formed in the extremely thin film | membrane form similarly to the fixing material 40 of the said embodiment.

  Here, FIG. 6 is an enlarged view showing a detailed cross-sectional structure of the heat conducting plate 61 in the present modification. Referring to FIG. 6, the heat conducting plate 61 includes a substrate 61a and an insulating treatment layer 61b formed on the surface of the substrate 61a. The insulating treatment layer 61 b is formed on the surface of the heat conducting plate 61 on the side facing the coil 20. Note that the materials of the substrate 61a and the insulation processing layer 61b of this modification are the same as those of the substrate 31a and the insulation treatment layer 31b of the above-described embodiment, and detailed description thereof is omitted. The heat conducting plates 62 to 64 also have the same cross-sectional structure as the heat conducting plate 61.

  The lifting magnet 5 of this modification further includes a rubbing prevention material 71 in addition to the above configuration. The rubbing prevention material 71 is provided between the coil 20 and the heat conducting plates 61 to 64, and adheres the heat conducting plates 61 to 64 to the coil 20 and prevents rubbing between the coil 20 and the heat conducting plates 61 to 64. . As the rubbing prevention material 71, for example, a thin adhesive film such as a mylar sheet is preferably used.

  In the lifting magnet 5 of this modified example, the insulation between the case 10 and the coil 20 can be ensured without relying on resin, like the lifting magnet 1 of the above embodiment. Thereby, since it becomes possible to make the fixing material 70 for fixing the coil 20 into a very thin film shape, the Joule heat of the coil 20 can be efficiently transmitted to the case 10 via the heat conducting plates 61 to 64. . Therefore, according to the lifting magnet 5 of this modification, the Joule heat generated in the coil 20 can be released more efficiently.

  In addition, as in this modification, the lifting magnet 5 preferably includes a rubbing prevention material 71 between the coil 20 and the heat conducting plates 61 to 64. Thereby, rubbing between the coil 20 and the heat conducting plates 61 to 64 due to aging can be prevented, and the reliability of the lifting magnet 5 can be improved. In particular, when the heat conducting plates 61 to 64 are made of a conductive material that has been subjected to insulation treatment on the surface facing the coil 20, the insulating treatment layer (by preventing the coil 20 and the heat conducting plates 61 to 64 from rubbing) For example, 61b) can be suitably protected.

  Also in this modification, the heat conducting plates 61 to 64 may be configured by a substrate made of an insulating material having a higher thermal conductivity than the fixing material 70. Moreover, in this modification, although the heat conductive plates 61-64 are arrange | positioned at the end surface 20a of the coil 20, the inner surface 20b, the outer surface 20c, and the end surface 20d, respectively, the end surface 20a of the coil 20, the inner surface 20b, outer By arranging the heat conducting plate on at least one of the side surface 20c and the end surface 20d, the effect of the present modification can be suitably obtained.

  The lifting magnet according to the present invention is not limited to the above-described embodiments and modifications, and various other modifications are possible. For example, in the above-described embodiment and each modification, the case 10 having the yoke 11, the inner pole 12, the outer pole 13, and the bottom plate 14 is illustrated as a case for housing the coil. The shape is not limited to this. As long as the coil can be accommodated, the present invention can be applied to cases of various other shapes.

(A) It is side surface sectional drawing which shows the structure of one Embodiment of the lifting magnet by this invention. (B) It is an enlarged view which shows the cross-section of a coil in detail. It is an enlarged view which shows the detailed cross-section of a heat-conducting plate. (A) It is side surface sectional drawing which shows the structure of the lifting magnet which concerns on a 1st modification. (B) It is side surface sectional drawing which shows the structure of the lifting magnet which concerns on a 2nd modification. It is side surface sectional drawing which shows the structure of the lifting magnet which concerns on a 3rd modification. It is side surface sectional drawing which shows the structure of the lifting magnet which concerns on a 4th modification. It is an enlarged view which shows the detailed cross-section of the heat-conduction board in a 4th modification. It is side surface sectional drawing which shows the structural example of the conventional lifting electromagnet.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1-5 ... Lifting magnet, 10 ... Case, 11 ... York, 12 ... Inner pole, 13 ... Outer pole, 14 ... Bottom plate, 20, 23-26, 50 ... Coil, 21 ... Conductor, 22 ... Insulation coating film, 31-36, 61-64 ... heat conducting plate, 31a, 61a ... substrate, 31b, 61b ... insulating treatment layer, 40, 70 ... fixing material, 71 ... rubbing prevention material.

Claims (5)

Coils,
A case for housing the coil;
A heat conducting plate disposed between the case and the coil;
A fixing material for fixing the coil in the case;
The heat conducting plate is made of a conductive material having a higher thermal conductivity than the fixing material and an insulating treatment applied to a surface facing the coil, or an insulating material having a higher thermal conductivity than the fixing material. Lifting magnet characterized by   2. The heat conductive plate is made of the conductive material having a surface that faces the coil that is insulated, and the conductive material is exposed on a surface that faces the case. Lifting magnet described in 1.   The lifting magnet according to claim 1, further comprising an anti-friction material provided between the coil and the heat conducting plate. The coil is formed by winding a plate-like conductor having a width over both ends of the coil,
The lifting magnet according to any one of claims 1 to 3, wherein the heat conducting plate is disposed between at least one end of the coils and the case.   The lifting magnet according to any one of claims 1 to 4, wherein the heat conducting plate is made of an aluminum plate whose surface facing the coil is anodized.

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