Inductor and power equipment

Abstract

The utility model relates to the technical field of electronic power, and discloses an inductor and power equipment, so as to improve the structural reliability of the inductor. The inductor comprises a magnetic core and a coil, the magnetic core comprises two end plates and a middle column, the two end plates are oppositely arranged at an interval, and the middle column is connected between the two end plates; the coil comprises N circles of wires wound around the middle column, pouring sealant is filled between the adjacent circles of wires of the coil, the first circle of wire and the Nth circle of wire of the coil are arranged close to the two end plates respectively, a gasket is arranged between at least one circle of wire in the first circle of wire and the Nth circle of wire and the end plate on the corresponding side, and the middle column is sleeved with the gasket. The hardness of the gasket is smaller than that of the pouring sealant; wherein N is the number of turns of the coil and is a positive integer greater than or equal to 1.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic power, in particular to an inductor and power equipment. Background Art

[0002] As an important component in power devices such as photovoltaic inverters and energy storage converters, the structural reliability of inductors directly affects the normal operation of power devices. Inductors can usually include a magnetic core and a coil, wherein the magnetic core includes two end plates and a middle column connected between the two end plates, and the coil is wound around the middle column. The coil generates a lot of heat when it is energized, which causes the coil to expand thermally. During the expansion process, the coil extends to both ends, thereby inducing an expansion force toward the two end plates. Under the action of the expansion force, the magnetic core is at risk of cracking, affecting its structural reliability. Utility Model Content

[0003] The utility model provides an inductor and a power device to improve the structural reliability of the inductor, thereby helping to improve the reliability of the power device using the inductor.

[0004] In the first aspect, the utility model provides an inductor, which includes a magnetic core and a coil. The magnetic core includes two end plates and a middle column, the two end plates are arranged opposite to each other, and the two end plates are spaced apart, and the middle column is connected between the two end plates. The coil includes N turns of wire wound around the middle column, N is the number of turns of the coil, and N is a positive integer greater than or equal to 1. Potting glue is filled between adjacent turns of wire of the coil, and among the N turns of wire, a gasket is arranged between at least one turn of wire in the first turn of wire and the Nth turn of wire and the end plate on the corresponding side, the gasket is sleeved on the middle column, and the hardness of the gasket is less than the hardness of the potting glue. When the coil is energized, the wires of each coil will expand due to the increase in temperature. Along the arrangement direction of the two end plates, the expansion force of the coil will extend to both ends through the potting glue filled between the wires, thereby inducing an expansion force toward the two end plates. Since the gasket is located in the transmission path of the expansion force and the hardness of the gasket is relatively soft, the gasket can provide a certain expansion space for the coil by deformation, reducing the expansion force ultimately transmitted by the coil to the two end plates, so that the two end plates can maintain a reliable connection with the center column, thereby improving the structural reliability of the magnetic core.

[0005] In some embodiments, the two ends of the center column and the two end plates may be relatively fixed by bonding.

[0006] In some embodiments, the arrangement direction of the two end plates is defined as a first direction, and the projection of the gasket in the first direction covers the projection of the coil in the first direction. In this way, the first gasket can alleviate the expansion force transmitted from the coil to the first end plate in the entire radial direction of the coil, thereby further reducing the force acting on the first end plate and improving the connection reliability between the first end plate and the center column.

[0007] In some embodiments, the projection of the gasket in the first direction covers the portion of the projection of the coil in the first direction. During the expansion of the coil, the gasket can provide a certain expansion space for the local area of ​​the coil along the radial direction by deformation, thereby reducing the expansion force that the coil ultimately transmits to the end plate to a certain extent.

[0008] In some embodiments, the projection of the coil in the first direction includes a first area and a second area. Along the radial direction of the coil, the first area is located on the inner side of the second area. The projection of the gasket in the first direction can cover the first area, so that the gasket can provide a certain expansion space for the inner side of the coil.

[0009] In some embodiments, the inductor includes a first insulating pad and a second insulating pad, the first insulating pad and the second insulating pad are respectively sleeved on the middle column, and the first insulating pad is located between the first circle of wires and the end plate on the corresponding side, and the second insulating pad is located between the Nth circle of wires and the end plate on the corresponding side. In this case, the end plate can be set on the side of the first insulating pad facing the first circle of wires and / or the side of the second insulating pad facing the Nth circle of wires. With this design, during the assembly process of the inductor, the washer can be first fixed to the first insulating pad and / or the second insulating pad, and then the first insulating pad and / or the second insulating pad with the washer attached can be fixed to the end plate to reduce the difficulty of installing the washer in the inductor.

[0010] In some embodiments, the hardness of the gasket may be less than or equal to shore 00 50. The gasket meeting this hardness condition can effectively absorb the expansion force of the coil, thereby alleviating the stress of the end plate and ensuring the connection strength between the end plate and the center column.

[0011] For example, the hardness of the gasket may be shore 00 50, shore 00 40, shore 00 30, shore 0020, or even lower, and so on.

[0012] In some embodiments, the thickness of the gasket may be greater than or equal to 2 mm and less than or equal to 3 mm. By designing the gasket to be within the above thickness range, the gasket can be installed while maintaining the original design size of the inductor, while providing a suitable expansion space for the coil during the deformation process.

[0013] Illustratively, the thickness of the gasket may be 2 mm, 2.3 mm, 2.5 mm, 3 mm, and so on.

[0014] In some embodiments, the material of the gasket includes but is not limited to thermal conductive pad, thermal conductive silicone grease, thermal conductive gel or silicone, etc.

[0015] In some embodiments, the inductor includes a box body, the magnetic core and the coil are accommodated in the box body, and the potting compound is filled in the remaining space in the box body, and the potting compound includes the magnetic core and the coil. The potting compound can not only realize the fixation of the magnet and the coil in the box body, but also transfer the heat generated by the coil to the box body, and then dissipate the heat to the outside through the box body.

[0016] In a second aspect, the utility model further provides a power device, which includes a housing, a power module disposed in the housing, and an inductor in any embodiment of the first aspect. Since the magnetic core in the inductor has strong structural reliability, the reliability of the power device using the inductor is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a photovoltaic system provided by an embodiment of the utility model;

[0018] Figure 2 A schematic diagram of the structure of a power device provided by an embodiment of the utility model;

[0019] Figure 3 A schematic diagram of a cross-sectional structure of an inductor provided in an embodiment of the utility model;

[0020] Figure 4 A schematic diagram of the cross-sectional structure of another inductor provided in an embodiment of the utility model;

[0021] Figure 5 A schematic diagram of a cross-sectional structure of another inductor provided in an embodiment of the utility model;

[0022] Figure 6 A schematic diagram of the cross-sectional structure of another inductor provided in an embodiment of the utility model.

[0023] Reference numerals:

[0024] 1000-power device; 100-housing; 200-power module; 300-inductor; 311-magnetic core; 3111-end plate; 3111a-first end plate;

[0025] 3111b - second end plate; 3112 - middle column; 313 - insulation assembly; 3131 - first insulation pad; 3132 - second insulation pad; 3133 - third insulation pad;

[0026] 314-washer; 314a-first washer; 314b-second washer; 315-box; 316-potting glue; 312-coil; 3121-first circle wire;

[0027] 312N-Nth turn of wire. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model clearer, the embodiments of the utility model will be further described in detail in conjunction with the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments described herein. The same figure marks in the figures represent the same or similar structures, and thus their repeated descriptions will be omitted. The words expressing position and direction described in the embodiments of the utility model are all explained with the accompanying drawings as examples, but changes can be made as needed, and the changes made are all included in the scope of protection of the utility model. The drawings of the embodiments of the utility model are only used to illustrate the relative position relationship and do not represent the true proportion.

[0029] It should be noted that specific details are described in the following description to facilitate understanding of the present invention. However, the embodiments of the present invention can be implemented in a variety of other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the embodiments of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Power devices are widely used in photovoltaic systems, charging networks, energy storage systems, or powertrain systems of new energy vehicles. Power devices can include energy storage converters, transformers, photovoltaic inverters, motor controllers, uninterruptible power supplies (UPS) or power supplies, etc., which are devices used to achieve power conversion.

[0031] Taking photovoltaic system as an example, Figure 1 A schematic diagram of the structure of a photovoltaic system provided in an embodiment of the utility model, the photovoltaic system includes one or more photovoltaic strings, power equipment and a transformer. The photovoltaic string may include a plurality of photovoltaic modules connected in series, the photovoltaic module is a DC power supply composed of solar cells packaged in series or in parallel, and is used to convert light energy into electrical energy; the power equipment may be an inverter, which can be used to convert the DC power output by the photovoltaic string into AC power output to the transformer; the transformer is used to transform the AC power output by the inverter and then merge it into the AC power grid, thereby realizing the grid connection of the photovoltaic system.

[0032] Figure 2 This is a schematic diagram of the structure of the power device 1000 provided in an embodiment of the present utility model. Figure 2As shown, the power device 1000 may include a housing 100 and a power module 200 and an inductor 300 contained in the housing 100. The power module 200 includes one or more power tube modules, each of which includes one or more power tubes. The power tubes include insulated gate bipolar transistors (IGBT), metal-oxide-semiconductor field-effect transistors (MOSFET) or power transistors, etc.

[0033] The power module 200, the inductor 300 and some other electrical components can be connected in a certain functional combination to form a power conversion circuit. In some embodiments, the power conversion circuit includes a DC conversion circuit and an inverter circuit. The input end of the DC conversion circuit can be used to connect to the photovoltaic module, the output end of the DC conversion circuit is connected to the input end of the inverter circuit, and the output end of the inverter circuit can be used to connect to the transformer. The DC conversion circuit is used to convert the DC voltage with a fixed amplitude output by the photovoltaic module into DC power with variable amplitude and polarity and then output it to the inverter circuit, and the inverter circuit is used to convert the DC power into AC power and then output it to the transformer. The DC conversion circuit and the inverter circuit respectively include inductors, wherein the inductor in the DC conversion circuit can be called a boost inductor, and the inductor in the inverter circuit can be called an inverter inductor.

[0034] Depending on the application scenario of the power device, there can be multiple boost inductors and multiple inverter inductors, and multiple boost inductors and multiple inverter inductors can be designed in an integrated manner, that is, multiple boost inductors can share one box, and multiple inverter inductors can share one box. The inductor can usually include a magnetic core and a coil, wherein the magnetic core can be used as the magnetic conductive material of the inductor, and the coil is made of a wire wound on the magnetic core, and the coil can be used to conduct current.

[0035] The coil will generate a lot of heat when it is powered on, and this heat can be dissipated to the outside through the box. The box is usually filled with potting glue, which can be filled between the wires of the coil and between the wires of the coil and the magnetic core, so that the heat generated by the coil can be transferred to the box through the potting glue, and further transferred from the box to the air flowing over its surface. Since the thermal expansion coefficient of the coil is relatively large, the coil tends to squeeze the potting glue due to expansion when the temperature rises. The potting glue will further transfer the expansion force of the coil to the magnetic core, thereby causing the risk of cracking the magnetic core, which in turn affects the working reliability of the inductor.

[0036] In view of this, the embodiment of the utility model provides an inductor and a power device using the inductor, so as to reduce the expansion force transmitted from the coil to the magnetic core by setting a low-hardness material between the coil and the local structure of the magnetic core, thereby reducing the risk of the magnetic core being cracked by force, and improving the reliability of the inductor and the power device using the inductor. The inductor provided by the embodiment of the utility model is specifically described below in conjunction with the accompanying drawings.

[0037] Figure 3 This is a schematic diagram of a cross-sectional structure of an inductor 300 provided in an embodiment of the present utility model. Figure 3 As shown, in the embodiment of the utility model, the magnetic core 311 includes two end plates 3111 and a middle column 3112, and the two end plates 3111 are arranged opposite to each other along the first direction, and the two end plates 3111 are spaced apart. For the convenience of description, the two end plates 3111 are respectively referred to as the first end plate 3111a and the second end plate 3111b. The middle column 3112 is located between the first end plate 3111a and the second end plate 3111b, and the two ends of the middle column 3112 are respectively connected to the first end plate 3111a and the second end plate 3111b. Exemplarily, the two ends of the middle column 3112 can be fixed to the first end plate 3111a and the second end plate 3111b by bonding.

[0038] In one implementation, the first end plate 3111a and the second end plate 3111b may be made of materials with high magnetic permeability such as magnetic powder core, ferrite, nanocrystalline or nanoamorphous. The materials of the middle column 3112 and the end plate 3111 may be the same to achieve the normalization of the incoming materials of the magnetic core 311 as a whole and reduce the production cost of the inductor 300. Of course, in some other implementations, the middle column 3112 and the end plate 3111 may also be made of different materials.

[0039] In addition, the middle column 3112 can be an integral structure or a combined structure formed by stacking multiple sections of columns in sequence. In the case where the middle column 3112 includes multiple sections of columns, adjacent columns can be relatively fixed by bonding, and the top and bottom columns are bonded and fixed to the first end plate 3111a and the second end plate 3111b respectively. This design of the middle column 3112 as a multi-section structure can effectively reduce the difficulty of processing the middle column 3112, thereby helping to reduce the difficulty of processing the inductor 300 as a whole.

[0040] Please continue to refer to Figure 3 , the coil 312 is wound around the middle column 3112, and the coil 312 includes N turns of wire. It is easy to understand that N is the number of turns of the coil 312, and N is a positive integer greater than or equal to 1. The N turns of wire of the coil 312 can be wound around the middle column 3112 in a clockwise direction, or can be wound around the middle column 3112 in a counterclockwise direction, and the utility model is not limited to this. Exemplarily, the coil 312 can be made of copper or aluminum.

[0041] In the embodiment of the utility model, the N-circle wire of the coil 312 includes a first-circle wire 3121 and an N-circle wire 312N, and the first-circle wire 3121 and the N-circle wire 312N are two-circle wires at both ends of the coil 312 along the first direction, wherein the first-circle wire 3121 is a circle of wire closest to the first end plate 3111a of the coil 312, and the N-circle wire 312N is a circle of wire closest to the second end plate 3111b of the coil 312. It is easy to understand that when N=1, the first-circle wire 3121 is the N-circle wire 312N.

[0042] In some embodiments, the inductor 300 further includes an insulating component 313, which can be used to insulate the coil 312 from the magnetic core 311. In a specific implementation, the insulating component 313 includes a first insulating pad 3131 and a second insulating pad 3132, which are respectively sleeved on the middle column 3112, and the first insulating pad 3131 and the second insulating pad 3132 are respectively arranged at both ends of the coil 312. The first insulating pad 3131 is located between the first circle wire 3121 and the first end plate 3111a, so as to insulate the coil 312 from the first end plate 3111a; the second insulating pad 3132 is located between the Nth circle wire 312N and the second end plate 3111b, so as to insulate the coil 312 from the second end plate 3111b. In addition, the insulating component 313 also includes a third insulating pad 3133, which can also be sleeved on the middle column 3112, and the third insulating pad 3133 extends along the first direction. Along the radial direction of the coil 312, the third insulating pad 3133 is located between the coil 312 and the middle column 3112, so as to insulate the coil 312 from the middle column 3112.

[0043] In one implementation, the first insulating pad 3131 and the second insulating pad 3132 may be made of plastic, and the third insulating pad 3133 may be made of insulating paper. In another implementation, the first insulating pad 3131, the second insulating pad 3132, and the third insulating pad 3133 may be made of the same material, for example, the three insulating pads may all be made of plastic or insulating paper. When the first insulating pad 3131, the second insulating pad 3132, and the third insulating pad 3133 are all made of plastic, the three insulating pads may be integrally injection molded to form a complete skeleton structure.

[0044] In the embodiment of the utility model, a washer 314 may be provided between at least one of the first circle of wires 3121 and the Nth circle of wires 312N and the end plate 3111 on the corresponding side, and the washer 314 is sleeved on the middle column 3112. For example, in the present embodiment, a washer 314 is provided between the first circle of wires 3121 and the first end plate 3111a, and a washer 314 is not provided between the Nth circle of wires 312N and the second end plate 3111b. For the convenience of description, the washer 314 between the first circle of wires 3121 and the first end plate 3111a is referred to as the first washer 314a. Exemplarily, the material of the first washer 314a includes, but is not limited to, a thermal pad, thermally conductive silicone, thermally conductive gel or silicone.

[0045] In one implementation, the first washer 314a may be disposed on the side of the first insulating pad 3131 facing the first circle wire 3121, that is, the first washer 314a is located between the first insulating pad 3131 and the first circle wire 3121. During the assembly process of the inductor 300, the first washer 314a may be first fixed to the first insulating pad 3131, and then the first insulating pad 3131 with the first washer 314a attached may be fixed to the first end plate 3111a, so as to reduce the difficulty of installing the first washer 314a in the inductor 300. Exemplarily, the first washer 314a may be fixed to the first insulating pad 3131 by bonding or the like.

[0046] As mentioned above, the inductor 300 may also include a box body 315 and a potting compound 316. The magnetic core 311, the coil 312, the insulating component 313, and the first gasket 314a may be assembled into one body and then assembled in the box body 315. Then, the potting compound 316 is poured into the box body 315 so that the potting compound 316 fills the remaining space of the box body 315 and wraps the components composed of the above components. The potting compound 316 can be used to fix the component in the box body 315 and transfer the heat generated by the coil 312 to the box body 315, and then dissipate the heat to the outside through the box body 315.

[0047] It is easy to understand that while the potting glue 316 wraps the above-mentioned components, it also fills the assembly gaps of the various components, such as including but not limited to between the various turns of wire of the coil 312, and between the Nth turn of wire 312N and the second insulating pad 3132. However, due to the existence of the first gasket 314a, there is basically no potting glue 316 or only a small amount of potting glue 316 between the first turn of wire 3121 and the first insulating pad 3131.

[0048] In this embodiment, the hardness of the first gasket 314a is less than the hardness of the potting glue 316. When the coil 312 is energized, the coils of the wires of the coil 312 will expand due to the increase in temperature. In the first direction, the expansion of the coil 312 will extend to both ends through the potting glue 316 filled between the coils, thereby inducing expansion forces toward the first end plate 3111a and the second end plate 3111b. The expansion force toward the first end plate 3111a will be transmitted to the first gasket 314a through the first coil wire 3121. Since the hardness of the first gasket 314a is relatively soft, it can provide a certain expansion space for the coil 312 by deformation, reducing the expansion force of the coil 312 finally transmitted to the first end plate 3111a, so that the first end plate 3111a can maintain a reliable connection with the middle column 3112, reducing the risk of cracking at the connection position between the first end plate 3111a and the middle column 3112, and improving the structural reliability of the magnetic core 311.

[0049] In a specific implementation, the hardness of the first gasket 314a may be less than or equal to shore 00 50. For example, the hardness of the first gasket 314a may be shore 00 50, shore 00 40, shore 00 30, shore 00 20, or even lower. The first gasket 314a that meets the hardness condition can effectively absorb the expansion force of the coil 312 in the first direction, thereby alleviating the stress of the first end plate 3111a and ensuring the connection strength between the first end plate 3111a and the center column 3112.

[0050] In addition to hardness, the thickness of the gasket 314 is also an important parameter that affects its ability to absorb the expansion force of the coil 312. In the embodiment of the utility model, the thickness of the first gasket 314a can be greater than or equal to 2 mm and less than or equal to 3 mm. For example, the thickness of the first gasket 314a can be 2 mm, 2.3 mm, 2.5 mm, 3 mm, and so on. By designing the first gasket 314a to be within the above-mentioned thickness range, the inductor 300 can be installed with the first gasket 314a while maintaining the original design size, and at the same time, the first gasket 314a can provide a suitable expansion space for the coil 312 during the deformation process.

[0051] Please continue to refer to Figure 3 In the embodiment of the utility model, the projection of the first gasket 314a in the first direction can cover the projection of the coil 312 in the first direction, so that the first gasket 314a can alleviate the expansion force transmitted by the coil 312 to the first end plate 3111a in the entire radial direction of the coil 312, thereby further reducing the force acting on the first end plate 3111a and improving the connection reliability between the first end plate 3111a and the middle column 3112.

[0052] Figure 4 This is a schematic diagram of a cross-sectional structure of another inductor 300 provided in an embodiment of the present utility model. Figure 4 As shown, in the embodiment of the utility model, washers 314 can be respectively arranged between the first circle wire 3121 and the first end plate 3111a, and between the Nth circle wire 312N and the second end plate 3111b, wherein the washer between the first circle wire 3121 and the first end plate 3111a is the first washer 314a, and the washer between the Nth circle wire 312N and the second end plate 3111b is the second washer 314b. The installation position, installation method, hardness, thickness, etc. of the first washer 314a can be designed with reference to the above-mentioned embodiment, and will not be repeated here. The relevant design of the second washer 314b is specifically described below.

[0053] In one implementation, the second washer 314b can be disposed on the side of the second insulating pad 3132 facing the N-th circle wire 312N, that is, the second washer 314b is located between the second insulating pad 3132 and the N-th circle wire 312N. During the assembly process of the inductor, the second washer 314b can be first fixed to the second insulating pad 3132, and then the second insulating pad 3132 with the second washer 314b attached can be fixed to the second end plate to reduce the difficulty of installing the second washer 314b in the inductor 300. Exemplarily, the second washer 314b can be fixed to the second insulating pad 3132 by bonding or the like. In addition, the material of the second washer 314b can be the same as that of the first washer 314a, or can be different, and the present invention is not limited to this.

[0054] In this embodiment, potting glue 316 is filled between each circle of the wire of the coil 312. However, due to the presence of the first gasket 314a and the second gasket 314b, there is basically no potting glue 316 or only a small amount of potting glue 316 between the first circle of wire 3121 and the first insulating pad 3131, and between the Nth circle of wire 312N and the second insulating pad 3132. The hardness of the second gasket 314b is less than the hardness of the potting glue 316. When the coil 312 is energized, the expansion force of the coil 312 toward the second end plate 3111b will be transmitted to the second gasket 314b through the Nth circle of wire 312N. Since the hardness of the second gasket 314b is relatively soft, it can provide a certain expansion space for the coil 312 by deformation, thereby reducing the expansion force of the coil 312 ultimately transmitted to the second end plate 3111b, so that the second end plate 3111b can maintain a reliable connection with the middle column 3112, reducing the risk of cracking at the connection position between the second end plate 3111b and the middle column 3112, and improving the structural reliability of the magnetic core 311.

[0055] Similarly, the hardness of the second gasket 314b can be less than or equal to shore 00 50. For example, the hardness of the second gasket 314b can be shore 00 50, shore 00 40, shore 00 30, shore 00 20, or even lower. The thickness of the second gasket 314b can be greater than or equal to 2 mm and less than or equal to 3 mm. For example, the thickness of the second gasket 314b can be 2 mm, 2.3 mm, 2.5 mm, 3 mm, and so on. By designing the hardness and thickness of the second gasket 314b to be within the above range, the inductor 300 can realize the installation of the second gasket 314b while maintaining the original design size, and at the same time, the second gasket 314b can provide a suitable expansion space for the coil 312 during the deformation process, thereby alleviating the stress of the second end plate 3111b and ensuring the connection strength between the second end plate 3111b and the middle column 3112.

[0056] In some embodiments, the projection of the second gasket 314b in the first direction can cover the projection of the coil 312 in the first direction, so that the second gasket 314b can alleviate the expansion force transmitted by the coil 312 to the second end plate 3111b in the entire radial direction of the coil 312, thereby further reducing the force acting on the second end plate 3111b and improving the connection reliability between the second end plate 3111b and the middle column 3112.

[0057] Figure 5 This is a schematic diagram of a cross-sectional structure of another inductor 300 provided in an embodiment of the present utility model. Figure 5 As shown, in the embodiment of the utility model, a first washer 314a is arranged between the first circle wire 3121 and the first end plate 3111a. The installation position, installation method, hardness, thickness, etc. of the first washer 314a can refer to Figure 3 The embodiment shown is designed. Figure 3 What is different from the embodiment shown in is that, in this embodiment, the projection of the first gasket 314a in the first direction covers the portion of the projection of the coil 312 in the first direction, that is, the ring width of the first gasket 314a is smaller than the ring width of the coil 312 (the ring width of the coil 312 is the diameter of the wire), and the first gasket 314a is positioned opposite to the local area of ​​the first circle of wire 3121 along the first direction.

[0058] In this embodiment, during the process of filling the potting glue 316 into the box body of the inductor 300, the potting glue 316 is filled between the coils of the coil 312 and between the Nth coil 312N and the second insulating pad 3132, and also filled in the space between the first coil 3121 and the first insulating pad 3131 that is not occupied by the first gasket 314a. During the process of energizing the coil 312, the expansion force of the coil 312 toward the first end plate 3111a is transmitted to the first gasket 314a through the first coil 3121. Since the first gasket 314a is relatively soft, it can provide a certain expansion space for the local area of ​​the coil 312 along the radial direction by deformation, thereby reducing the expansion force of the coil 312 that is finally transmitted to the first end plate 3111a to a certain extent, and reducing the risk of cracking at the connection position between the first end plate 3111a and the middle column 3112.

[0059] In one implementation, the projection of the coil 312 in the first direction includes a first area A and a second area B, the first area A and the second area B are arranged along the radial direction of the coil 312, and the first area A is located inside the second area B, and the projection of the first gasket 314a in the first direction can cover the first area A. It can also be understood that the first gasket 314a is opposite to the inner area of ​​the first circle of wire 3121 in the first direction, so that the first gasket 314a can provide a certain expansion space for the inner side of the coil 312.

[0060] Figure 6 This is a schematic diagram of a cross-sectional structure of another inductor 300 provided in an embodiment of the present utility model. Figure 6 As shown, in the embodiment of the utility model, a first washer 314a is provided between the first circle wire 3121 and the first end plate 3111a, and a second washer 314b is provided between the Nth circle wire 312N and the second end plate 3111b, wherein the first washer 314a can refer to Figure 5 Similar to the first gasket 314a, in this embodiment, the projection of the second gasket 314b in the first direction covers the portion of the coil 312 projected in the first direction, that is, the loop width of the second gasket 314b is smaller than the loop width of the coil 312, and the second gasket 314b is opposite to the local area of ​​the Nth circle of wire 312N along the first direction. In addition, the installation position, installation method, hardness, thickness, etc. of the second gasket 314b can refer to Figure 4 The embodiment shown in the figure is designed and will not be described in detail here.

[0061] In this embodiment, during the process of filling the potting glue 316 into the box body of the inductor 300, the potting glue 316 is not only filled between the coils of the coil 312, but also filled in the space between the first coil 3121 and the first insulating pad 3131 that is not occupied by the first washer 314a, and filled in the space between the Nth coil 312N and the second insulating pad 3132 that is not occupied by the second washer 314b. During the process of energizing the coil 312, the expansion force of the coil 312 toward the second end plate 3111b is transmitted to the second washer 314b through the Nth coil 312N. Since the hardness of the second washer 314b is relatively soft, it can provide a certain expansion space for the local area of ​​the coil 312 along the radial direction by deformation, thereby reducing the expansion force of the coil 312 that is finally transmitted to the second end plate 3111b to a certain extent, and reducing the risk of cracking at the connection position between the second end plate 3111b and the middle column 3112.

[0062] The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An inductor, characterized in that: It includes a magnetic core and a coil, wherein: The magnetic core comprises two end plates and a middle column, the two end plates are arranged opposite to each other and spaced apart, and the middle column is connected between the two end plates; The coil includes N turns of wire wound around the center column, adjacent turns of wire of the coil are filled with potting glue, the first turn of wire and the Nth turn of wire of the coil are respectively arranged close to the two end plates, a gasket is arranged between at least one turn of wire among the first turn of wire and the Nth turn of wire and the end plate on the corresponding side, the gasket is sleeved on the center column, and the hardness of the gasket is less than the hardness of the potting glue; wherein, N is the number of turns of the coil, and N is a positive integer greater than or equal to 1.

2. The inductor according to claim 1, characterized in that The projection of the gasket in a first direction covers the projection of the coil in the first direction, and the first direction is the arrangement direction of the two end plates.

3. The inductor according to claim 1, characterized in that The projection of the gasket in a first direction covers a portion of the projection of the coil in the first direction, and the first direction is an arrangement direction of the end plates.

4. The inductor according to claim 3, characterized in that The projection of the coil in the first direction includes a first area and a second area, and along the radial direction of the coil, the first area is located inside the second area; A projection of the gasket in the first direction covers the first area.

5. The inductor according to any one of claims 1 to 4, characterized in that: The inductor comprises a first insulating pad and a second insulating pad, wherein the first insulating pad and the second insulating pad are respectively sleeved on the middle column, and the first insulating pad is located between the first circle of wires and the end plate on the corresponding side, and the second insulating pad is located between the Nth circle of wires and the end plate on the corresponding side; The gasket is arranged on a side of the first insulating pad facing the first circle of conductive wires and / or a side of the second insulating pad facing the Nth circle of conductive wires.

6. The inductor according to any one of claims 1 to 4, characterized in that: The hardness of the gasket is less than or equal to shore00 50.

7. The inductor according to any one of claims 1 to 4, characterized in that: The thickness of the gasket is greater than or equal to 2 mm and less than or equal to 3 mm.

8. The inductor according to any one of claims 1 to 4, characterized in that: The material of the gasket includes a thermal pad, thermal grease, thermal gel or silica gel.

9. The inductor according to any one of claims 1 to 4, characterized in that: The inductor further includes a box body, the magnetic core and the coil are accommodated in the box body, the potting glue is filled in the box body, and the potting glue wraps the magnetic core and the coil.

10. A power device, characterized in that: The power device comprises a housing, a power module arranged in the housing, and an inductor according to any one of claims 1 to 9, and is used for power conversion.

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