square coil former

Abstract

The application discloses a square coil panel, and relates to the technical field of electromagnetic heating, which comprises a panel body, a coil and a shielding assembly. The panel body is square and has opposite heating surfaces and supporting surfaces. The coil is arranged on the heating surfaces of the panel body. The shielding assembly comprises first shielding components arranged on the heating surfaces and second shielding components arranged on the supporting surfaces. The first shielding components and the second shielding components cooperate to shield the magnetic lines generated by the coil and concentrate the magnetic lines on a heating target. The technical scheme provided by the application solves the technical problem that the existing coil panel cannot meet different requirements for heating the whole machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic heating, in particular to a square coil panel. BACKGROUND

[0002] The electromagnetic heating coil works on the principle of electromagnetic induction. When alternating current passes through the coil, it generates an alternating magnetic field around it. When a conductive material is placed near the coil, the magnetic field will generate eddy currents in the conductor. The resistance of the eddy current causes energy loss, thereby converting electrical energy into heat energy. In use, two or more coil panels are usually assembled in a complete machine, so that they can be switched between two panels during heating, or they can be used simultaneously to adapt to different shapes of pots.

[0003] However, the existing coil panel cannot meet the different needs of the complete machine during use. SUMMARY

[0004] The main purpose of the present application is to provide a square coil panel, which aims to solve the technical problem that the existing coil panel cannot meet the different needs of the complete machine.

[0005] To achieve the above purpose, the square coil panel provided by the present application comprises:

[0006] a panel body, which is square-shaped and has opposite heating surfaces and supporting surfaces;

[0007] a coil, which is arranged on the heating surface of the panel body; and

[0008] a shielding assembly, which comprises a first shielding component arranged on the heating surface and a second shielding component arranged on the supporting surface, and the first shielding component and the second shielding component cooperate to shield the magnetic lines generated by the coil and concentrate the magnetic lines on the heating target.

[0009] In an embodiment, the first shielding component comprises a first magnetic strip and a second magnetic strip arranged at intervals from the outer layer of the heating surface to the inner layer of the heating surface, and the first magnetic strip and the second magnetic strip cooperate to shield the circumferentially leaked magnetic lines of the coil.

[0010] In an embodiment, at least one first magnetic strip is arranged on each of the two adjacent sides of the panel body, and the two first magnetic strips arranged on the two adjacent sides are arranged at intervals; and / or,

[0011] one second magnetic strip is arranged on each of the two adjacent sides of the panel body.

[0012] In an embodiment, at least two winding areas are arranged along the radial direction of the disc body, each winding area corresponding to one coil, wherein the outer periphery of one coil near the edge of the disc body is provided with the first magnetic strip, and the second magnetic strip is arranged between two adjacent coils.

[0013] In an embodiment, the square coil disc further comprises an isolation component, one isolation component is arranged between two adjacent coils, and the isolation component is provided with a magnetic strip groove, and the second magnetic strip is arranged in the magnetic strip groove.

[0014] In an embodiment, the second shielding component comprises a third magnetic strip and a fourth magnetic strip arranged in sequence from the inner layer of the support surface to the outer layer of the support surface, and the fourth magnetic strip and the third magnetic strip cooperate to shield the magnetic lines of force of the coil reverse leakage.

[0015] In an embodiment, the third magnetic strip is arranged in multiple along the circumferential direction of the disc body, and one fourth magnetic strip is arranged at each corner of the disc body.

[0016] In an embodiment, a through slot is arranged at the center of the disc body, one end of the third magnetic strip near the through slot extends towards the heating surface to form a magnetic sealing protrusion, and one magnetic sealing protrusion is arranged corresponding to each third magnetic strip.

[0017] In an embodiment, the coil is fixed to the heating surface of the disc body by electronic silica gel; and / or,

[0018] The coil is fixed to the heating surface of the disc body by resin oil.

[0019] In an embodiment, the square coil disc further comprises thermal insulation cotton arranged on the side of the coil away from the disc body, for maintaining the temperature of the coil stable.

[0020] The technical scheme provided by the present application discloses a square coil disc, which can provide support for the coil. The square coil disc can reduce the heating blind area between two or more coil discs when the coil discs are spliced. The coil is arranged on the heating surface of the disc body and used for generating magnetic lines to realize induction heating of the heating target. In addition, when the heating target needs to be heated, the first shielding component can shield the magnetic lines leaked outward from the coil in the circumferential direction, and the second shielding component can shield the magnetic lines radiated toward the support surface. The first shielding component and the second shielding component can effectively shield the magnetic lines generated by the coil and radiate the magnetic lines in the opposite direction to the heating area, so that the magnetic lines can be more concentrated in the planar area of the coil disc, thereby concentrating the energy of the magnetic lines and reducing the energy leakage loss of the magnetic lines. The technical scheme provided by the present application can replace the traditional circular coil disc with the square coil disc, reduce the heating blind area between two or more coil discs when the coil discs are spliced, and achieve the bridging function. The pot can be placed on the coil disc or between two coil discs to be heated, thereby improving the use experience of consumers. The shielding assembly is arranged to reduce the energy leakage loss of the magnetic lines of the square coil disc during the working process, thereby improving the heating efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description can only be some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 Structure diagram of the embodiment of the square coil disc provided by the present application Figure 1 ;

[0023] Figure 2 Structure diagram of the embodiment of the square coil disc provided by the present application Figure 2 ;

[0024] Figure 3 Another view of the structure diagram of the embodiment of the square coil disc provided by the present application.

[0025] Explanation of reference numerals:

[0026] 10, disc body; 20, coil; 30, shielding assembly; 31, first shielding component; 311, first magnetic strip; 312, second magnetic strip; 32, second shielding component; 321, third magnetic strip; 3211, magnetic sealing protrusion; 322, fourth magnetic strip; 40, isolation accessory; 50, thermal insulation cotton.

[0027] The objectives, functional characteristics and advantages of the present application will be further described with reference to the embodiments in combination with the accompanying drawings. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present application.

[0029] It should be noted that if the embodiments of the present application involve directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directionality indication also changes accordingly.

[0030] In addition, if the embodiments of the present application involve the description of "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel solutions are included, for example, "A and / or B" includes A solution, or B solution, or A and B solutions are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0031] For the coil disc for electromagnetic heating, two or more coil discs are usually assembled in a whole machine during use, so that the two discs can be switched with each other or simultaneously bridged during heating to adapt to different shapes of pots. However, there is a large heating blind area between the two traditional circular discs, and the magnetic lines will leak during the working and testing process of the existing square coil disc, causing loss and failing to meet the different demands of the whole machine heating.

[0032] Therefore, the embodiments of the present application provide a square coil disc, the disc body is set to be square, thereby reducing the heating blind area, a first shielding component is arranged on the heating surface of the disc body, and a second shielding component is arranged on the supporting surface of the disc body, so that the leaked magnetic lines are concentrated on the heating target through the cooperation of the first shielding component and the second shielding component, the energy loss is reduced, and the heating efficiency of the whole machine is improved.

[0033] In order to better understand the above technical solutions, the above technical solutions are described in detail below in combination with the drawings.

[0034] As shown in Figure 1 , Figure 2 , Figure 3 The present application provides a square coil panel, comprising:

[0035] For the above purpose, the square coil panel provided by the present application comprises:

[0036] The panel body 10 is square and has opposite heating surfaces and supporting surfaces;

[0037] The coil 20 is arranged on the heating surface of the panel body 10; and

[0038] The shielding assembly 30 comprises a first shielding component 31 arranged on the heating surface and a second shielding component 32 arranged on the supporting surface, and the first shielding component 31 and the second shielding component 32 cooperate to shield the magnetic lines generated by the coil 20 and concentrate the magnetic lines on the heating target.

[0039] In the technical solution adopted in this embodiment, the panel body 10 provides support for the coil 20. The square panel body 10 reduces the heating blind area between the coil panels when two or more coil panels are spliced. The coil 20 is arranged on the heating surface of the panel body 10 to generate magnetic lines and realize induction heating of the heating target. In addition, when the heating target needs to be heated, the first shielding component 31 can shield the magnetic lines leaked outward in the circumferential direction of the coil 20, and the second shielding component 32 can shield the magnetic lines radiated toward the supporting surface. The cooperation of the first shielding component 31 and the second shielding component 32 can effectively shield the magnetic lines generated by the coil 20 and radiate the magnetic lines in the opposite direction to the heating area, so that the magnetic lines can be more concentrated in the planar area of the coil panel, thereby concentrating the energy of the magnetic lines and reducing the energy leakage loss of the magnetic lines. The technical solution provided in the embodiment of the present application replaces the traditional circular coil panel with a square coil panel, which can reduce the heating blind area between the coil panels when two or more coil panels are spliced and achieve a bridging function. The pot can be placed on the coil panel or between two coil panels to be heated, improving the user experience. The shielding assembly 30 is arranged to reduce the energy leakage loss of the magnetic lines during the working process of the square coil panel, thereby improving the heating efficiency.

[0040] Specifically, the square coil disc comprises a disc body 10, a coil 20 and a shielding assembly 30. The disc body 10 can be made of plastic or resin material, has excellent heat resistance and good insulating performance, and has certain mechanical strength, which can provide support. The coil 20 is a multi-strand fine wire tightly wound and flattened coil 20, which can enhance the electromagnetic performance of the coil 20, thereby improving the inductance performance of the coil 20, and can improve the thermal stability of the coil 20, so that the magnetic field generated by the current is more uniform, and the risk of local overheating is reduced. The shielding assembly 30 comprises a first shielding component 31 arranged on the heating surface and a second shielding component 32 arranged on the support surface, which is used to shield the magnetic lines of force leaked by the coil 20 towards the non-heating area, thereby concentrating the energy of the magnetic lines of force and reducing the energy loss of the magnetic lines of force. It can be understood that the first shielding component 31 can shield the magnetic lines of force leaked towards the edge of the heating surface, and the second shielding component 32 can shield the magnetic lines of force leaked towards the support surface in the opposite direction. In this embodiment, two or more coil discs can be assembled in one machine, and the disc body 10 is square-shaped, so that the two coil discs can be switched with each other during the heating process, or can be simultaneously bridged to work, and the heating blind area between the coil discs can be smaller when the pot is placed between the two coils 20.

[0041] Further, with reference to Figure 2 In an embodiment of the present application, the first shielding component 31 comprises a first magnetic strip 311 and a second magnetic strip 312 arranged between the outer layer of the heating surface and the inner layer of the heating surface, and the first magnetic strip 311 and the second magnetic strip 312 cooperate to shield the magnetic lines of force leaked circumferentially by the coil 20.

[0042] In the technical solution adopted in this embodiment, the first shielding component 31 can comprise a first magnetic strip 311 and a second magnetic strip 312. In this embodiment, the inner layer and the outer layer of the heating surface are distinguished along the diagonal direction of the square disc body 10, wherein the inner layer is close to the center of the square disc body 10, and the outer layer is close to the edge of the square disc body 10. The first magnetic strip 311 is arranged on the side of the coil 20 close to the edge of the square disc body 10, and is used to shield the magnetic lines of force leaked towards the outside of the square disc body 10. The second magnetic strip 312 is arranged on the side of the coil 20 close to the center of the square disc body 10, and is used to shield the magnetic lines of force leaked towards the center of the square disc body 10. The first magnetic strip 311 and the second magnetic strip 312 are used in cooperation to reduce the magnetic lines of force leaked circumferentially, thereby enhancing the heating effect of the magnetic field generated by the coil 20. Moreover, the influence of the magnetic field of the coil 20 on the surrounding environment can be reduced, and the interference of the external magnetic field on the internal magnetic field of the coil 20 can also be reduced.

[0043] Further, with reference to Figure 2 In an embodiment of the present application, at least one first magnetic strip 311 is arranged on each of the two adjacent sides of the disc body 10, and the two first magnetic strips 311 adjacent to the two sides are arranged at intervals; and / or,

[0044] Two adjacent sides of the disc body 10 correspond to a second magnetic strip 312.

[0045] In the technical scheme adopted in this embodiment, the first magnetic strip 311 and the second magnetic strip 312 are both irregular geometric shapes. The first magnetic strip 311 has a first part and a second part connected to each other, the first part is parallel to the side of the coil 20, and the second part is consistent with the contour of the outer corner of the coil 20. The second magnetic strip 312 has a first arc side and a second arc side connected end to end, the curvature of the second arc side is smaller than that of the first arc side, and the first arc side is consistent with the contour of the inner corner of the coil 20. By such arrangement, the magnetic force lines can be better shielded and concentrated, so that the magnetic force lines act on the heating target.

[0046] Further, with reference to Figure 2 In an embodiment of the present application, at least two winding regions are arranged along the radial direction of the disc body 10, and each winding region is provided with a coil 20. The outer periphery of a coil 20 close to the edge of the disc body 10 is provided with a first magnetic strip 311, and the second magnetic strip 312 is arranged between two adjacent coils 20.

[0047] In the technical scheme adopted in this embodiment, the double-loop or multi-loop coil 20 provides more uniform magnetic field distribution to enhance the electromagnetic performance. In the following description, the double-loop coil 20 is introduced. In this embodiment, the first magnetic strip 311 is used to shield the magnetic force lines outside the outer periphery of the outer loop coil 20. The second magnetic strip 312 is arranged between the outer loop coil 20 and the inner loop coil 20, which can reduce the electromagnetic interference between the outer loop coil 20 and the inner loop coil 20. The first arc side of the second magnetic strip 312 is consistent with the contour of the inner corner of the outer loop coil 20, and the second arc side of the second magnetic strip 312 is consistent with the outer contour of the inner loop coil 20.

[0048] Further, with reference to Figure 3 In an embodiment of the present application, the square coil disc further comprises a separation accessory 40, and the separation accessory 40 is arranged between two adjacent coils 20 and is provided with a magnetic strip groove, and the second magnetic strip 312 is arranged in the magnetic strip groove.

[0049] In the technical scheme adopted in this embodiment, the square coil disc can further comprise a separation accessory 40. The separation accessory 40 is fixed on the disc body 10 by extrusion between the outer loop coil 20 and the inner loop coil 20. In this embodiment, the separation accessory 40 is square, and each corner of the separation accessory 40 is provided with a magnetic strip groove consistent with the outer contour of the second magnetic strip 312, for arranging the second magnetic strip 312. In this way, the magnetic force lines generated by the coil 20 can be effectively concentrated, and the interference and leakage between the magnetic force lines can be reduced.

[0050] Further, with reference toFigure 3 In an embodiment of the present application, the second shielding component 32 comprises a third magnetic strip 321 and a fourth magnetic strip 322 arranged in sequence from the inner layer of the support surface to the outer layer of the support surface, and the fourth magnetic strip 322 and the third magnetic strip 321 cooperate to shield the magnetic lines of force leaking reversely from the coil 20.

[0051] In the technical solution adopted in this embodiment, the second shielding component 32 can comprise the third magnetic strip 321 and the fourth magnetic strip 322. In this embodiment, the inner layer of the support surface is close to the central axis of the support surface, and the outer layer of the support surface is close to the corner of the support surface. The third magnetic strip 321 covers most of the support surface to shield the magnetic lines of force toward the support surface and radiate reversely to act on the heating target. The fourth magnetic strip 322 is arranged at the corner of the support surface to shield the magnetic lines of force in the blind area not covered by the third magnetic strip 321, thereby improving the uniformity of electromagnetic heating. The third magnetic strip 321 and the fourth magnetic strip 322 cooperate to reduce the magnetic lines of force leaking reversely, thereby enhancing the central magnetic line of force, improving the central temperature, making the temperature more uniform, and achieving better heating effect.

[0052] Further, with reference to Figure 2 In an embodiment of the present application, the third magnetic strip 321 is arranged at intervals along the circumferential direction of the disc body 10, and one fourth magnetic strip 322 is arranged at each corner of the disc body 10.

[0053] In the technical solution adopted in this embodiment, the third magnetic strip 321 and the fourth magnetic strip 322 are both irregular geometric shapes. The third magnetic strip 321 has opposite first and second ends, and a plurality of third magnetic strips 321 are arranged in sequence along the circumferential direction of the disc body 10, so that the first ends of the plurality of third magnetic strips 321 form an inner circle, and the second ends of the plurality of third magnetic strips 321 form an outer circle. The fourth magnetic strip 322 has a first outer contour connected to a second outer contour, the first outer contour is consistent with the corner shape of one coil 20 close to the edge of the disc body 10, and the second outer contour is consistent with the outer circle formed by the second ends of the plurality of third magnetic strips 321. Through such arrangement, the circular shielding structure formed by the plurality of third magnetic strips 321 can enhance the structural stability of the coil disc and prolong the service life, and one fourth magnetic strip 322 is arranged at each corner of the disc body 10, which can reduce the leakage of magnetic lines of force and improve the airtightness of shielding.

[0054] Further, with reference to Figure 3 、 Figure 1 In an embodiment of the present application, a through slot is arranged at the center of the disc body 10, one end of the third magnetic strip 321 close to the through slot extends toward the heating surface to form a magnetic sealing protrusion 3211, and one magnetic sealing protrusion 3211 is arranged corresponding to each third magnetic strip 321.

[0055] In the technical scheme adopted in this embodiment, the magnetic sealing protrusion 3211 is arranged to concentrate the magnetic lines generated by the coil 20 and reduce the diffusion of the magnetic lines in the non-heating area, thereby improving the heating efficiency and uniformity. In this embodiment, the magnetic sealing protrusion 3211 extends through the through slot to the heating surface and can also reinforce the third magnetic strip 321.

[0056] Further, in an embodiment of the present application, the coil 20 is fixed to the heating surface of the disc body 10 by electronic silica gel; and / or,

[0057] The coil 20 is fixed to the heating surface of the disc body 10 by resin oil.

[0058] In the technical scheme adopted in this embodiment, the coil 20 can be fixed to the heating surface of the disc body 10 by electronic silica gel or resin oil. Both the electronic silica gel and the resin oil have good adhesive properties, which can ensure that the coil 20 is firmly fixed on the heating surface of the disc body 10 and reduce the displacement caused by vibration or thermal expansion. Moreover, both the electronic silica gel and the resin oil have good insulation properties, which can reduce the risk of short circuit of the circuit and damage of the electrical components and improve the safety of the equipment. In addition, if the coil 20 needs to be repaired or replaced, the coil 20 fixed by the electronic silica gel or the resin oil is easier to disassemble, which facilitates the maintenance work. In this embodiment, the coil 20 is a multi-strand fine-wire tightly wound flat coil 20. By the fixing method of the electronic silica gel or the resin oil, the wire diameter and the winding area of the enameled wire can be reasonably configured, and the coil 20 is arranged in cooperation with the various profiled magnetic strips in the shielding assembly 30, so that the magnetic lines are all concentrated on the heating target and the leakage of the magnetic lines is reduced. At the same time, a corresponding electric control scheme can be matched to reduce the loss and make the thermal efficiency reach or be higher than the national standard level one. During assembly, the square isolation fitting 40 or a clamp is used for isolation, and the clamp is removed after the coil 20 is shaped, so as to ensure that the finally displayed coil 20 is square.

[0059] Further, with reference to ​ In an embodiment of the present application, the square coil disc further comprises thermal insulation cotton 50 arranged on the side of the coil 20 away from the disc body 10 to keep the temperature of the coil 20 stable.

[0060] In the technical scheme adopted in this embodiment, the thermal insulation cotton 50 is arranged to reduce the loss of temperature and improve the energy utilization rate. The thermal insulation cotton 50 can be fixed by structure or attached to the surface of the coil 20 by adhesive, and the specific fixing method is not limited herein. The thermal insulation cotton 50 should be selected according to the temperature resistance grade of the material and should have sufficient temperature resistance and flame resistance. Moreover, in order to ensure safety, the coil 20 and the thermal insulation cotton 50 should be regularly inspected.

[0061] The above merely illustrates the embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, within the technical concept of the present application, and based on the content of the present application and the accompanying drawings, are included in the patent protection scope of the present application.

Claims

1. A square coil disk, characterized in that, include: The plate is square in shape and has opposing heating and support surfaces; A coil, wherein the coil is disposed on the heating surface of the disk body; as well as The shielding assembly includes a first shielding component disposed on the heating surface and a second shielding component disposed on the supporting surface. The first shielding component and the second shielding component cooperate to shield the magnetic lines of force generated by the coil and concentrate the magnetic lines of force onto the heating target. The first shielding component includes a first magnetic strip and a second magnetic strip spaced apart from the outer layer of the heating surface to the inner layer of the heating surface. The first magnetic strip and the second magnetic strip cooperate to shield the magnetic lines of force leaking circumferentially from the coil. The first magnetic strip is disposed on the side of the coil near the edge of the disk body, and the second magnetic strip is disposed on the side of the coil near the center of the disk body. The first magnetic strip has a first portion and a second portion connected together. The first portion is parallel to the side of the coil, and the second portion is consistent with the contour of the outer corner of the coil. The second magnetic strip has a first arc edge and a second arc edge connected end to end. The arc of the second arc edge is smaller than that of the first arc edge, and the first arc edge is consistent with the contour of the inner corner of the coil. The second shielding component includes a third magnetic strip and a fourth magnetic strip arranged sequentially from the inner layer of the support surface to the outer layer of the support surface. The fourth magnetic strip and the third magnetic strip cooperate to shield the magnetic lines of force leaking in the reverse direction from the coil. Multiple third magnetic strips are spaced apart along the circumferential direction of the disk body, and each corner of the disk body corresponds to one fourth magnetic strip. Each third magnetic strip has a first end and a second end facing each other. Multiple third magnetic strips are arranged sequentially along the circumferential direction of the disk body, such that the first ends of the multiple third magnetic strips form an inner circle, and the second ends of the multiple third magnetic strips form an outer circle. The fourth magnetic strip has a first outer contour and a second outer contour connected end to end. The first outer contour is consistent with the shape of a corner of the coil near the edge of the disk body, and the second outer contour is consistent with the arc of the outer circle formed by the second ends of the multiple third magnetic strips.

2. The square coil disk as described in claim 1, characterized in that, At least one first magnetic strip is provided on each of two adjacent sides of the disk body, and the two first magnetic strips on the two adjacent sides are spaced apart; and / or The two adjacent sides of the disk body correspond to one of the second magnetic strips.

3. The square coil disk as described in claim 2, characterized in that, At least two winding regions are spaced apart along the radial direction of the disk body, and each winding region is provided with a coil. The outer periphery of one coil near the edge of the disk body is provided with the first magnetic strip, and the second magnetic strip is provided between two adjacent coils.

4. The square coil disk as described in claim 3, characterized in that, The square coil disk also includes an isolation accessory, with one isolation accessory provided between two adjacent coils, and the isolation accessory having a magnetic strip groove, with the second magnetic strip disposed in the magnetic strip groove.

5. The square coil disk as described in claim 1, characterized in that, A through groove is provided at the center of the disc body, and one end of the third magnetic strip near the through groove extends toward the heating surface to form a magnetic sealing protrusion, and each of the third magnetic strips is provided with a corresponding magnetic sealing protrusion.

6. The square coil disk as described in claim 1, characterized in that, The coil is fixed to the heating surface of the disk using electronic silicone; and / or, The coil is fixed to the heating surface of the disc by resin oil.

7. The square coil disk as described in claim 1, characterized in that, The square coil also includes insulation cotton, which is located on the side of the coil away from the coil body to keep the coil temperature stable.

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