Optimized magnetic device

Abstract

The application relates to the technical field of magnetic devices, and discloses an optimized magnetic device, which comprises a magnetic core, windings, metal terminals, a magnetic cover plate and an adhesive layer. The magnetic core comprises a middle column and side end plates connected to the two ends of the middle column, the windings are arranged on the middle column according to a preset rule, each winding has winding lead-in joints at both ends, the metal terminals are oppositely arranged and kept at a certain interval on the side end plates, the winding lead-in joints are electrically connected with the metal terminals, the magnetic cover plate is connected to the magnetic core, a first matching groove is arranged at the end of the magnetic cover plate and corresponds to the metal terminals, the adhesive layer comprises a main adhesive part and a first adhesive part which are integrally connected, the main adhesive part is connected between the side end plate and the metal terminal, and the first adhesive part extends into the first matching groove. The application improves the structural reliability of the magnetic device, reduces the magnetic leakage of the magnetic device, avoids the magnetic field loss, and optimizes the performance of the magnetic device.

Description

Technical Field

[0001] This application relates to the field of magnetic device technology, and specifically to an optimized magnetic device. Background Technology

[0002] Magnetic devices are widely used in the automotive industry to address issues related to power filtering and power conversion. They can help reduce common-mode noise in power lines, ensuring the normal operation of electronic devices in automobiles. Furthermore, their application in automotive cables and signal lines effectively reduces electromagnetic interference, helping automotive systems meet electromagnetic compatibility standards. However, in actual automotive operating conditions, the accompanying mechanical vibrations, uncertain mechanical shocks, operating temperatures ranging from -50℃ to +150℃, various humidity levels, salt spray conditions, and altitude pose significant challenges to the reliable operation of magnetic devices. To better meet the requirements of the automotive environment, it is necessary to design a magnetic device with excellent reliability. Summary of the Invention

[0003] In view of this, this application provides an optimized magnetic device to improve the reliability of the optimized magnetic device.

[0004] To achieve the above objectives, the technical solution adopted is as follows:

[0005] An optimized magnetic device includes: a magnetic core, comprising a central post and side end plates connected to both ends of the central post; windings wound on the central post according to a preset rule, each winding having a winding lead at both ends; metal terminals arranged opposite to each other and at a certain interval on the side end plates, the winding leads being electrically connected to the metal terminals; a magnetic cover plate connected to the magnetic core and forming a closed magnetic circuit with the magnetic core, a first mating groove being formed at the end of the magnetic cover plate corresponding to the metal terminals; and an adhesive layer for bonding and fixing the magnetic cover plate and the metal terminals to the magnetic core, the adhesive layer comprising an integrally connected main adhesive portion and a first adhesive portion, the main adhesive portion being connected between the side end plates and the metal terminals, and the first adhesive portion extending into the first mating groove.

[0006] This application further specifies that: the adhesive layer includes a second adhesive portion integrally connected to the main adhesive portion, and the second adhesive portion is connected between the side end plate and the magnetic cover plate.

[0007] This application is further configured such that: a welding part is integrally connected to the metal terminal, and first functional slots are symmetrically opened on both sides of the side end plate; the winding lead passes through the first functional slots and is fixed to the welding part to form an electrical connection.

[0008] This application is further configured such that: the side end plate has a second functional groove that matches the metal terminal, the metal terminal is located in the second functional groove, and the main adhesive portion is filled in the second functional groove and fixes the metal terminal.

[0009] This application is further configured such that: the side end plate has a connecting groove, the second functional groove and the first mating groove are connected and communicate with each other through the connecting groove, and the first adhesive part is integrally connected with the main adhesive part through the connecting groove.

[0010] This application is further configured such that: a second mating groove is provided at the bottom of the second functional groove; the metal terminal is integrally connected with a bent foot; the bent foot extends vertically into the second mating groove; the adhesive layer includes a third adhesive portion integrally connected with the main adhesive portion; and the third adhesive portion fills the space between the second mating groove and the bent foot.

[0011] This application is further configured such that: a mating through hole is provided on the metal terminal, the mating through hole is kept at a certain distance from the bent foot, and the adhesive layer includes a fourth adhesive part integrally connected with the main adhesive part, the fourth adhesive part filling the mating through hole.

[0012] This application is further configured such that: a third functional slot is symmetrically opened on the side of the side end plate opposite to the magnetic cover plate, which is connected and communicates with the second functional slot; the metal terminal is integrally connected with an external pin, and the external pin is matched on the third functional slot.

[0013] This application is further configured such that: a first auxiliary groove is provided on both sides of the side end plate, and a second auxiliary groove is provided on the side of the magnetic cover plate and at a position corresponding to the first auxiliary groove; the first auxiliary groove and the second auxiliary groove are connected and communicate with each other; the adhesive layer includes a fifth adhesive part integrally connected with the main adhesive part; and the fifth adhesive part is filled in the first auxiliary groove and the second auxiliary groove.

[0014] This application further specifies that: the integrally connected central column and the side end plate form an I-shaped structure, the portion of the side end plate protruding from the central column forms a side leg wall, and the height of the side leg wall relative to the central column is greater than the height of the winding relative to the central column.

[0015] In summary, compared with the prior art, this application discloses an optimized magnetic device. Multiple windings are wound on the central column of a magnetic core according to a preset rule, and each winding has a winding lead at both ends. Metal terminals electrically connected to the winding leads are arranged opposite each other and at a certain interval on the side end plates at both ends of the central column. A magnetic cover plate connected to the magnetic core forms a closed magnetic circuit with the magnetic core. The adhesive layer is used to bond and fix the magnetic cover plate and the metal terminals on the magnetic core. The main adhesive part of the adhesive layer is integrally connected to a first adhesive part, which extends into the first mating groove of the magnetic cover plate. Through the above configuration, this application improves the structural reliability of the magnetic device and optimizes the overall performance of the magnetic device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the optimized magnetic device in this embodiment;

[0018] Figure 2 This is a schematic diagram of the optimized magnetic device with hidden windings and metal terminals in this embodiment;

[0019] Figure 3 This is a schematic diagram of the magnetic core of the optimized magnetic device in this embodiment;

[0020] Figure 4 This is a schematic diagram of the first side view structure of the optimized magnetic device in this embodiment;

[0021] Figure 5 This is a schematic diagram of the second side view structure of the optimized magnetic device in this embodiment.

[0022] Reference numerals: 1. Magnetic core; 11. Central column; 12. Side end plate; 13. First functional slot; 14. First auxiliary slot; 2. Winding; 21. Winding lead; 3. Metal terminal; 31. Welding part; 32. Bending foot; 33. Mating through hole; 34. External foot; 4. Magnetic cover plate; 41. First mating slot; 42. Second auxiliary slot; 5. Adhesive layer; 50. Main adhesive part; 51. First adhesive part; 52. Second adhesive part; 53. Third adhesive part; 54. Fourth adhesive part; 55. Fifth adhesive part; 6. Second functional slot; 61. Connecting slot; 62. Second mating slot; 63. Third functional slot; 7. Side leg wall. Detailed Implementation

[0023] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0024] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.

[0025] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0026] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "part," or "unit" may be used interchangeably.

[0027] In the description of this application, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] The technical solutions shown in this application will be described in detail below through specific embodiments. It should be noted that the order of description of the following embodiments is not intended to limit the priority of the embodiments.

[0029] As described in the background section, magnetic devices are widely used in automotive systems. However, in the actual operating conditions of automobiles, there are mechanical vibrations, uncertain mechanical shocks, operating temperatures ranging from -50℃ to +150℃, as well as various humidity conditions, salt spray conditions, and altitudes. Magnetic devices in related technologies do not possess the reliability required to handle these conditions, thus failing to guarantee a good service life. Based on this, this embodiment discloses an optimized magnetic device.

[0030] Please refer to Figure 1 , Figure 2 as well as Figure 3 The optimized magnetic device in this embodiment may include a magnetic core 1, a winding 2, a metal terminal 3, a magnetic cover plate 4, and an adhesive layer 5.

[0031] Specifically, the magnetic core 1 includes a central column 11 and side end plates 12 connected to both ends of the central column 11. The windings 2 are wound on the central column 11 according to a preset rule, and each winding 2 has a winding lead 21 at both ends. The metal terminals 3 are arranged opposite each other and at a certain interval on the side end plates 12. The winding lead 21 is electrically connected to the metal terminals 3. The magnetic cover plate 4 is connected to the magnetic core 1 and forms a closed magnetic circuit with the magnetic core 1. The adhesive layer 5 is used to bond and fix the magnetic cover plate 4 and the metal terminals 3 to the magnetic core 1 respectively.

[0032] In the specific implementation process, a first mating groove 41 is provided at the end of the magnetic cover plate 4 and at the position corresponding to the metal terminal 3. The adhesive layer 5 may include an integrally connected main adhesive part 50 and a first adhesive part 51. The main adhesive part 50 is connected between the side end plate 12 and the metal terminal 3. The first adhesive part 51 extends into the first mating groove 41. Based on the structural design of the adhesive layer 5, the main adhesive part 50 is used to bond and fix the side end plate 12 and the metal terminal 3 respectively. With the cooperation of the first mating groove 41, the first adhesive part 51 ensures the fixed connection between the magnetic cover plate 4 and the magnetic core 1. Thus, the adhesive layer 5 makes the magnetic core 1, the metal terminal 3 and the magnetic cover plate 4 firmly connected as a whole, thereby improving the structural reliability of the magnetic device.

[0033] Furthermore, the first adhesive portion 51 extending into the first mating groove 41 can fill one-half or completely fill the first mating groove 41 to ensure the fixed connection between the magnetic cover plate 4 and the magnetic core 1. The end of the first mating groove 41 facing the side end plate 12 can be provided with a flared structure so that the first adhesive portion 51 can extend into the first mating groove 41 better. That is, the first mating groove 41 can gradually shrink from the side end plate 12 end to the magnetic cover plate 4 end in terms of groove structure.

[0034] The position of the first mating groove 41 on the magnetic cover plate 4 can correspond to the metal terminal 3. That is, the symmetrical first mating groove 41 can also calibrate the mating position of the magnetic cover plate 4 and the magnetic core 1, prevent the magnetic cover plate 4 from being accidentally displaced or shifted, and thus ensure the integrity of the overall structure of the magnetic device.

[0035] In order to further improve the stable connection between the magnetic cover plate 4 and the magnetic core 1, the adhesive layer 5 may include a second adhesive part 52 integrally connected with the main adhesive part 50, and the second adhesive part 52 is connected between the side end plate 12 and the magnetic cover plate 4.

[0036] In some embodiments, the side end plate 12 and the magnetic cover plate 4 can maintain a uniform gap facing each other. Then, the second adhesive portion 52 can extend from the main adhesive portion 50 and fully fill the gap to ensure the fixed connection between the side end plate 12 and the magnetic cover plate 4.

[0037] On the other hand, an embedded groove can be provided on the side of the side plate 12 facing the magnetic cover plate 4, and / or on the side of the magnetic cover plate 4 facing the side plate 12, so as to accommodate the second adhesive part 52 through the embedded groove, so as to ensure the fixed connection between the side plate 12 and the magnetic cover plate 4.

[0038] It is understandable that the metal terminals 3 on the side end plate 12 are arranged opposite each other and maintain a certain distance to avoid accidental contact between adjacent metal terminals 3. The winding 2 is wound according to a preset rule. The preset rule may be to select several windings 2 with the same winding direction, or to adopt an alternating direction and parallel direction design to reduce leakage inductance; or to specify the number of windings 2, the winding density of windings 2, and the wire material used for windings 2, etc.

[0039] In this embodiment, a welding part 31 is integrally connected to the metal terminal 3. The two sides of the side end plate 12 can be symmetrically provided with first functional slots 13. The winding lead 21 can be fixed to the welding part 31 after passing through the first functional slots 13, so as to facilitate the electrical connection between the winding lead 21 and the metal terminal 3. The fixing method here can be achieved by laser welding or hard pressure welding.

[0040] In some embodiments, the end of the welding part 31 away from the metal terminal 3 may also be provided in the form of a spherical structure, so as to ensure that the winding connector 21 can be conveniently and quickly wound on the welding part 31, and the smooth spherical structure can also prevent the winding connector 21 from being scratched. That is, through the end provided with the spherical structure, it is ensured that the winding connector 21 can be neatly and evenly applied to the welding part 31.

[0041] It should be noted that the winding connector 21 is led out from both ends of the winding 2. Taking two stacked windings 2 as an example, the windings 2 at the same end can lead out two winding connectors 21 of different layers. These two winding connectors 21 are fixed one-to-one with the symmetrically arranged welding parts 31 after passing through the first functional slots 13 on both sides, so as to facilitate the welding and fixing of subsequent processes and the construction of the coil loop.

[0042] The depth of the first functional slot 13 is greater than the wire diameter of the winding connector 21, so as to protect the winding connector 21 located on the side of the side end plate 12.

[0043] In the specific implementation process, in order to further improve the stable connection between the metal terminal 3 and the magnetic core 1, a second functional groove 6 matching the metal terminal 3 can be opened on the side end plate 12. The metal terminal 3 can be located in the second functional groove 6, and the outline shape of the metal terminal 3 can match the groove shape of the second functional groove 6. The main adhesive part 50 is filled in the second functional groove 6 to fix the metal terminal 3.

[0044] Furthermore, the side end plate 12 may also have a connecting groove 61, through which the second functional groove 6 and the first mating groove 41 can be connected and communicated. In this way, the first adhesive part 51 is integrally connected with the main adhesive part 50 through the connecting groove 61, thereby ensuring the overall continuity of the adhesive layer 5, so as to facilitate the stable connection between the metal terminal 3 and the magnetic core 1.

[0045] In this embodiment, a second mating groove 62 can also be provided at the bottom of the second functional groove 6. The metal terminal 3 is integrally connected with a bent leg 32, which is vertically inserted into the second mating groove 62. The adhesive layer 5 can include a third adhesive part 53 integrally connected with the main adhesive part 50. The third adhesive part 53 fills the space between the second mating groove 62 and the bent leg 32, thereby ensuring a stable connection between the bent leg 32 and the second mating groove 62 through the third adhesive part 53, which greatly enhances the stable connection between the metal terminal 3 and the magnetic core 1.

[0046] Further reference Figure 4 A mating through hole 33 can also be provided on the metal terminal 3. The mating through hole 33 is kept at a certain distance from the bent foot 32. The adhesive layer 5 can include a fourth adhesive part 54 integrally connected with the main adhesive part 50. The fourth adhesive part 54 fills the mating through hole 33, that is, the fourth adhesive part 54 continues to ensure the stable connection between the metal terminal 3 and the magnetic core 1.

[0047] The filling height of the fourth adhesive part 54 within the mating through hole 33 can be more than one-third of the thickness of the metal terminal 3 to ensure the filling effect.

[0048] Continue to refer to Figure 5In this embodiment, the side end plate 12 is provided with first auxiliary grooves 14 on both sides, and a second auxiliary groove 42 can be provided on the side of the magnetic cover plate 4 at a position corresponding to the first auxiliary groove 14. The first auxiliary groove 14 and the second auxiliary groove 42 are connected and communicate with each other. The adhesive layer 5 can include a fifth adhesive part 55 integrally connected with the main adhesive part 50. The fifth adhesive part 55 fills the first auxiliary groove 14 and the second auxiliary groove 42, that is, the first auxiliary groove 14 and the second auxiliary groove 42 are bonded by the fifth adhesive part 55 respectively, thereby ensuring the fixed connection between the side end plate 12 and the magnetic cover plate 4.

[0049] It is understood that, in this embodiment, the first adhesive part 51, the second adhesive part 52, the third adhesive part 53, the fourth adhesive part 54 and the fifth adhesive part 55 are all extended from the main adhesive part 50 under the structural design of the side end plate 12 and the magnetic cover plate 4. This ensures that the adhesive layer 5 is a whole, so that the magnetic core 1, the metal terminal 3 and the magnetic cover plate 4 have a good fixing effect on each other, thereby improving the overall structural reliability of the magnetic device.

[0050] In the specific implementation process, the side end plate 12 is symmetrically provided with a third functional slot 63 on the side opposite to the magnetic cover plate 4, which is connected and communicated with the second functional slot 6. The metal terminal 3 is integrally connected with an external pin 34, which is matched on the third functional slot 63 and protrudes from the side end plate 12 so that the magnetic device can be externally connected through the external pin 34.

[0051] The external pins 34 are located on the same plane and can be kept parallel to the side end plate 12 to facilitate the external mounting of magnetic devices.

[0052] It should be noted that the external pin 34 and the bent pin 32 in this embodiment can be perpendicular to the metal terminal 3 so that the metal terminal 3 can be conveniently and reliably assembled on the magnetic core 1.

[0053] It should be noted that the integrally connected central column 11 and side end plate 12 form an I-shaped structure, and the part of the side end plate 12 protruding from the central column 11 forms the side leg wall 7. The height of the side leg wall 7 relative to the central column 11 is greater than the height of the winding 2 relative to the central column 11, so as to facilitate the winding of the winding 2 and also to facilitate the construction of the closed magnetic circuit of the magnetic cover plate 4 and the magnetic core 1.

[0054] Furthermore, in this embodiment, the external pin 34 can be extended to be flush with the side leg wall 7. Based on the structural design of the side leg wall 7, the magnetic device in this embodiment can prevent magnetic field loss and reduce magnetic leakage of the magnetic core 1, thereby reducing the impact on surrounding electromagnetically sensitive devices during actual operation and thus improving the overall performance of the magnetic device.

[0055] In this embodiment, both the magnetic core 1 and the magnetic cover plate 4 are made of magnetic materials. These magnetic materials can include one or more of ferrite materials, magnetic metal alloy materials, iron-silicon alloy materials, or soft magnetic materials to meet the working requirements of the magnetic device.

[0056] In some embodiments, the cross-sectional contours of the aforementioned first mating groove 41, second mating groove 62, mating through hole 33, first auxiliary groove 14 and second auxiliary groove 42 can be arc-shaped, sawtooth-shaped, triangular or wedge-shaped, so as to ensure sufficient contact of the adhesive layer 5 and fixed bonding after contact, thereby ensuring the overall connection stability of the magnetic device.

[0057] In this embodiment, the central column 11 can be designed as a rectangular structure to facilitate the stacking of the windings 2, thereby providing more winding space. The edges and corners of the rectangular body can also be used to adjust the magnetic field distribution of the magnetic device, which helps to optimize the performance of the inductor and makes it easier to process and manufacture in the production process.

[0058] In summary, the optimized magnetic device disclosed in this embodiment has windings 2 wound on the central column 11 of the magnetic core 1 according to a preset rule, and each winding 2 has a winding lead 21 at both ends. Metal terminals 3 electrically connected to the winding lead 21 are arranged opposite each other and at a certain interval on the side end plates 12 at both ends of the central column 11. The magnetic cover plate 4 connected to the magnetic core 1 forms a closed magnetic circuit with the magnetic core 1. The adhesive layer 5 is used to bond and fix the magnetic cover plate 4 and the metal terminals 3 to the magnetic core 1. The main adhesive part 50 of the adhesive layer 5 is integrally connected with the first adhesive part 51, the second adhesive part 52, the third adhesive part 53, the fourth adhesive part 54 and the fifth adhesive part 55. Through the corresponding first mating groove 41, the second mating groove 62, the mating through hole 33, the first auxiliary groove 14 and the second auxiliary groove 42, the overall structural reliability of the magnetic device is improved, thereby improving the comprehensive performance of the magnetic device.

[0059] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping to understand the core ideas of the present application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present application. Therefore, the content of this specification should not be construed as a limitation of the present application.

Claims

1. An optimized magnetic device, characterized in that, include: A magnetic core, including a central post and side end plates connected to both ends of the central post; The windings are wound on the central column according to a preset rule, and each winding has a winding lead at both ends. Metal terminals are arranged opposite each other and at a certain interval on the side end plate, and the winding lead is electrically connected to the metal terminals; A magnetic cover plate is connected to the magnetic core and forms a closed magnetic circuit with the magnetic core. A first mating groove is provided at the end of the magnetic cover plate and at the position corresponding to the metal terminal. An adhesive layer is used to bond and fix the magnetic cover plate and the metal terminal to the magnetic core. The adhesive layer includes an integrally connected main adhesive part and a first adhesive part. The main adhesive part is connected between the side end plate and the metal terminal, and the first adhesive part extends into the first mating groove. The side end plate has a second functional groove that matches the metal terminal. The metal terminal is located in the second functional groove. The main adhesive part fills the second functional groove and fixes the metal terminal. The side end plate has a connecting groove. The second functional groove and the first mating groove are connected and communicate with each other through the connecting groove. The first adhesive part is integrally connected to the main adhesive part through the connecting groove.

2. The optimized magnetic device as described in claim 1, characterized in that, The adhesive layer includes a second adhesive portion integrally connected to the main adhesive portion, and the second adhesive portion is connected between the side end plate and the magnetic cover plate.

3. The optimized magnetic device as described in claim 1, characterized in that, The metal terminal is integrally connected to a welding part, and the two sides of the side end plate are symmetrically provided with first functional slots. The winding lead passes through the first functional slots and is fixed to the welding part to form an electrical connection.

4. The optimized magnetic device as described in claim 1, characterized in that, A second mating groove is provided at the bottom of the second functional groove. The metal terminal is integrally connected with a bent foot. The bent foot extends vertically into the second mating groove. The adhesive layer includes a third adhesive part integrally connected with the main adhesive part. The third adhesive part fills the space between the second mating groove and the bent foot.

5. The optimized magnetic device as described in claim 4, characterized in that, A mating through hole is also provided on the metal terminal. The mating through hole is kept at a certain distance from the bent foot. The adhesive layer includes a fourth adhesive part integrally connected with the main adhesive part. The fourth adhesive part fills the mating through hole.

6. The optimized magnetic device as described in claim 1, characterized in that, A third functional slot is symmetrically provided on the side of the side end plate opposite to the magnetic cover plate, which is connected and communicates with the second functional slot. The metal terminal is integrally connected with an external pin, which is matched on the third functional slot.

7. The optimized magnetic device as described in claim 1, characterized in that, The side end plate is provided with a first auxiliary groove on both sides, and a second auxiliary groove is provided on the side of the magnetic cover plate at a position corresponding to the first auxiliary groove. The first auxiliary groove and the second auxiliary groove are connected and communicate with each other. The adhesive layer includes a fifth adhesive part integrally connected with the main adhesive part, and the fifth adhesive part is filled in the first auxiliary groove and the second auxiliary groove.

8. The optimized magnetic device according to any one of claims 1 to 7, characterized in that, The integrally connected central column and the side end plate form an I-shaped structure. The portion of the side end plate protruding from the central column forms a side leg wall. The height of the side leg wall relative to the central column is greater than the height of the winding relative to the central column.

Images