Electromagnetic system and contactor

Abstract

The application provides an electromagnetic system and a contactor, the electromagnetic system comprising: a base and at least two electromagnetic units arranged in the base, the base comprising walls surrounding installation spaces for installing the electromagnetic units; the electromagnetic unit comprising a coil support for winding a coil, the coil support being provided with a terminal lug at an incoming terminal and an outgoing terminal respectively corresponding to one side of the wall, the terminal lug comprising a connecting portion; the wall being provided with an opening corresponding to the position of the connecting portion of the electromagnetic unit, and the two electromagnetic units being connected by a connecting wire arranged outside the wall, the connecting wire being passed into the installation space through the opening and connected with the connecting portion to form a connection. The application can improve the reliability of the product.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment, specifically to an electromagnetic system and a contactor. Background Technology

[0002] Contactors are primarily low-voltage components used to control motors. Their main function is to frequently connect, disconnect, and carry motor circuits or power supply circuits over long distances. A contactor typically includes a contact system, an electromagnetic system, and a support / insulation system. The electromagnetic system comprises moving and stationary iron cores, coil windings, etc.

[0003] Due to space limitations in electrical control cabinets, large-size AC contactors cannot be made large enough to provide sufficient suction force for the electromagnetic system. Therefore, such as Figure 15 As shown, a known contactor consists of two identical electromagnetic system components connected in series to form an electromagnetic system assembly, providing electromagnetic attraction for the contactor. The electromagnetic system components are connected and merged through series coils; that is, the two coils are twisted and welded together by a wire, with the input terminal of one coil and the output terminal of the other coil, forming a system coil assembly. The other untwisted and unwelded terminals of the two coils serve as the input and output terminals of the system coil assembly. The two coils of the system coil assembly are respectively mounted on two E-type stationary iron core columns. Then, the two stationary iron core assemblies with their coils mounted are sequentially installed into the product in the same direction and fixed in place. In this scheme, before the coils are connected and merged, tape is used to temporarily fix the input and output terminals of the coil enameled wire during coil winding, and the input and output enameled wires are manually twisted and welded together with the conductor. This process is prone to the risk of incomplete soldering or wire breakage. Moreover, since the electromagnetic system assembly is only connected by coil wires and is not fixed as a whole, it is a soft connection. During the process of sequentially installing it into the product, the connecting wires are easily loosened or broken due to pulling, resulting in rework of the finished product or potential quality problems, which increases the product assembly cost and reduces the product's stability and reliability. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an electromagnetic system and contactor with better stability and reliability.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An electromagnetic system for a contactor includes: a base and at least two electromagnetic units disposed within the base, the base including a wall forming a mounting space for mounting the electromagnetic units;

[0007] The electromagnetic unit includes a coil support for winding a coil, and the coil support has connecting pieces at the inlet and outlet ends on one side corresponding to the wall, and the connecting pieces include connecting portions;

[0008] The wall has an opening at the position of the connection part of the electromagnetic unit. The two electromagnetic units pass through the opening into the installation space through a connecting line provided outside the wall and connect with the connection part to form a connection.

[0009] Preferably, both ends of the connecting wire are provided with plug terminals corresponding to the shape of the connecting part, and the plug terminals can be directly inserted into the connecting part to form a connection.

[0010] Preferably, the connecting line includes a first connecting line, one end of which is connected to the connecting portion of the output end of an electromagnetic unit, and the other end of which is connected to the connecting portion of the input end of another electromagnetic unit.

[0011] Preferably, the connecting wire further includes a second connecting wire and a third connecting wire. The electromagnetic system includes a power input converter disposed at the output end of the base. One end of the second connecting wire is connected to the connection part of the input end of an electromagnetic unit, and the other end of the second connecting wire is connected to the first pole of the power input converter. One end of the third connecting wire is connected to the connection part of the output end of another electromagnetic unit, and the other end of the third connecting wire is connected to the second pole of the power input converter.

[0012] Preferably, the base further includes a groove disposed on the outer side of the wall, and the connecting wire is disposed in the groove.

[0013] Preferably, the base is provided with limiting ribs for positioning the electromagnetic unit.

[0014] Preferably, the electromagnetic unit is provided with an elastic buckle, and the base is provided with a slot corresponding to the elastic buckle. When the electromagnetic unit slides into the installation space in the base and the elastic buckle reaches the position of the slot, the elastic buckle pops out and engages with the slot.

[0015] Preferably, the coil support is provided with a fixing cavity for installing the connector piece, the connector piece includes a fixing part, the fixing part is inserted into the fixing cavity, its two side walls form an interference fit with the fixing cavity, and the fixing part is also provided with barbed structures on both sides.

[0016] Preferably, the connector includes a wire end fixing portion for connecting to the wire of the coil, and the coil support is further provided with a cover for at least surrounding the wire end fixing portion of the connector.

[0017] Preferably, the coil bracket is provided with a guide groove on one side corresponding to the wire end fixing part, and the cover is provided with a guide rib corresponding to the guide groove. The cover is connected by inserting the guide rib into the guide groove.

[0018] Preferably, in the insertion direction of the cover, the coil bracket is further provided with a limiting protrusion, and the insertion end of the cover is provided with a limiting buckle corresponding to the limiting protrusion. When the cover is inserted, the limiting protrusion and the limiting buckle engage.

[0019] Preferably, the insertion end of the cover is further provided with a first limiting rib, and the coil bracket is provided with a second limiting rib. When the cover is inserted, the first limiting rib and the second limiting rib mutually limit each other in a direction perpendicular to the insertion direction.

[0020] Preferably, the bottom of the base is also provided with a protective partition.

[0021] This invention also provides a contactor, including an electromagnetic system, a contact system, and an arc-extinguishing system, wherein the electromagnetic system is the aforementioned electromagnetic system.

[0022] This invention provides a structure for a contactor and its electromagnetic system. The electromagnetic unit is installed inside the base, and the electromagnetic unit is connected to form a coil assembly through connecting lines outside the base. This solves the problems of inconvenience in assembly and movement caused by the need to connect the electromagnetic unit externally before installing it into the product, as well as the potential problems of broken wires and poor soldering during the process. It achieves the effect of allowing the static iron core assembly to be installed from both sides of the product base, connecting the coil externally, and ensuring stability and reliability.

[0023] In addition, the enameled wire of the coil can be automatically wound onto the pre-assembled and fixed terminal block, and the entry and exit ends of the enameled wire are fixed by welding. This eliminates the need for manual temporary fixation of the entry and exit ends of the enameled wire with tape, increases the connection reliability and stability of the coil components, and reduces the manufacturing cost of the coil components.

[0024] In addition, the device includes a connector comprising a fixing part, a welding part, and a plug-in connection part. The fixing part has a barbed structure and an interference fit with the cavity adapted to the coil, ensuring stable fixing of the connector. The welding part provides a fixing space for the entry and exit of the coil's enameled wire and fixes the enameled wire through a welding process. The plug-in connection part provides a structure that mates with quick-connect terminals, enabling the coil to be inserted from both sides of the contactor base and connected externally via quick-connect terminals. When using this connector, it only needs to be reversed and inserted into the coil frame fixing cavity, eliminating the need for an additional connector part and reducing mold investment.

[0025] Furthermore, the coil structure described above includes two covers, each positioned at one of the two terminals of the coil support. Each cover features a receiving cavity, two snap-fit ​​mechanisms, and a guide / limiting structure. The receiving cavity encloses the wire end fixing portion of the terminals, reducing the bending process required after welding, simplifying the application of coil welding terminals, lowering assembly costs, and increasing the dielectric properties of the terminals to prevent tip discharge. The snap-fit ​​mechanism matches the corresponding protruding structure on the coil frame, preventing the cover from detaching from the coil frame. The guide / limiting structure facilitates the positioning and assembly of the cover.

[0026] Furthermore, the aforementioned cover can be equipped with a limiting rib structure that is compatible with the coil firmware response slot, thereby preventing the product from coming off due to vibration during the on / off movement.

[0027] Finally, in this embodiment, at least one protective cover is added to the bottom to prevent the internal parts of the product from being exposed, isolate the risk of foreign objects entering, and improve the product's protective capabilities and reliability. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the contactor structure created by the present invention;

[0029] Figure 2 This is a schematic diagram of the assembly process of the electromagnetic unit and the base of this invention;

[0030] Figure 3 This is a schematic diagram of the assembly process of the electromagnetic unit, connecting line and end cap created by this invention;

[0031] Figure 4 This is a schematic diagram of the electromagnetic unit structure created by the present invention;

[0032] Figure 5 This is a schematic diagram of the electromagnetic unit assembly of the present invention;

[0033] Figure 6 This is a schematic diagram of the assembly of the connector, cover, and coil support of the present invention;

[0034] Figure 7 This is a schematic diagram of the coil support structure created by the present invention;

[0035] Figure 8 This is a schematic diagram of the connector structure created in this invention;

[0036] Figure 9 This is a schematic diagram of the cover structure created by the present invention;

[0037] Figure 10 This is a schematic diagram of the wall structure of the base created in this invention;

[0038] Figure 11This is a schematic diagram of the bottom structure of the contactor created in this invention;

[0039] Figure 12 This is a schematic diagram of the protective cover structure created by the present invention;

[0040] Figure 13 This is a schematic diagram of the side structure of the contactor created by this invention;

[0041] Figure 14 yes Figure 13 Enlarged image of E in Chinese;

[0042] Figure 15 This is a schematic diagram of an existing contactor assembly. Detailed Implementation

[0043] The specific implementation of the electromagnetic system and contactor of the present invention will be further described below with reference to the accompanying drawings. The electromagnetic system and contactor of the present invention are not limited to the descriptions in the following embodiments.

[0044] like Figure 1-3 The present embodiment provides a contactor 10, which includes: an electromagnetic system 101, a contact system (not shown in the figure), and an arc extinguishing system 103.

[0045] The electromagnetic system includes a base 9 and two electromagnetic units 7 disposed within the base 9. The base 9 includes a wall 90 that forms an installation space 90a for mounting the electromagnetic units 7. In some embodiments, more than two electromagnetic units 7 may be provided depending on the required attraction force.

[0046] Please refer to Figure 3-9 As shown, the electromagnetic unit 7 includes: a coil 26, a coil support 20 for winding the coil 26, and a magnetic yoke assembly 70. The coil support 20 has connecting pieces 1 on one side of the wall 90 of the base 9, at the inlet and outlet ends respectively. Each connecting piece 1 includes a wire end fixing part 12a and a connecting part 13a. The wire end fixing part 12a is used to connect to the wire of the coil 26. The wire end fixing part 12a on the inlet end side is used to fix the inlet wire, and the wire end fixing part 12a on the outlet end side is used to fix the outlet wire. The connecting part 13a is used to connect an external connecting wire 17 to another electromagnetic unit 7 in series or parallel.

[0047] Please continue to refer to this. Figure 2-3 As shown, the base 9 has walls on both sides and the bottom. In this embodiment, the wall 90 on one side is provided with an opening 91 corresponding to the position of the connection part 13a of each electromagnetic unit 7. The two electromagnetic units 7 are connected to the connection part 13a by the connection line 17 provided outside the wall 90 through the opening 91 into the installation space 90a.

[0048] In some embodiments, when there are two or more electromagnetic units 7, the number of openings 91 corresponding to the wall 90 is also increased accordingly.

[0049] In some embodiments, the terminal blocks 1 at the inlet and outlet ends may correspond to different walls of the base 9, in which case the openings 91 may be respectively set on the walls on two opposite sides.

[0050] In some embodiments, the terminal blocks 1 at the inlet and outlet ends may also correspond to the bottom wall of the base 9, in which case the opening 91 may be provided on the bottom wall.

[0051] like Figure 2-3 As shown, the two electromagnetic units 7 in this embodiment can be connected by the connecting line 17 to increase the attraction of the electromagnetic system 101 to the contact system. Specifically, the two electromagnetic units 7 can be connected in series or in parallel by the connecting line 17. The two electromagnetic units 7 are installed in the installation space 90a, and the connecting line 17 is located outside the installation space 90a.

[0052] In this embodiment, both ends of the connecting wire 17 are provided with plug terminals 15 corresponding to the shape of the connecting portion 13a. The plug terminals 15 can be directly inserted into the connecting portion 13a to form a connection. Through the provision of the plug terminals 15,

[0053] As a specific implementation method, such as Figure 2 As shown, the two electromagnetic units 7 are connected in series. Specifically, the connecting line 17 includes a first connecting line 171. One end of the first connecting line 171 is connected to the connecting part 13a of the output end of one electromagnetic unit 7, and the other end of the first connecting line 171 is connected to the connecting part 13a of the input end of the other electromagnetic unit 7.

[0054] Furthermore, the connecting line 17 also includes a second connecting line 172 and a third connecting line 173. The electromagnetic system includes a power input converter 12 disposed at the output end of the base 9. One end of the second connecting line 172 is connected to the connecting portion 13a of the input end of an electromagnetic unit 7, and the other end of the second connecting line 172 is connected to the first pole of the power input converter 12. One end of the third connecting line 173 is connected to the connecting portion 13a of the output end of another electromagnetic unit 7, and the other end of the third connecting line 173 is connected to the second pole of the power input converter 12.

[0055] Based on the first connecting line 171, the second connecting line 172, the third connecting line 173, and the power input conversion unit 12, the two electromagnetic units 7 are connected in series.

[0056] As another specific implementation method, the parallel structure of two electromagnetic units 7 can be realized by using different connection methods.

[0057] In this embodiment, both electromagnetic units 7 are arranged on the same side using connecting pieces. Therefore, a wire groove 14 can also be provided on the outside of the base 9. The wire groove 14 is set on the outside of the wall 90 through screw holes 92, and the connecting wire 17 is set in the wire groove 14. This allows the connecting wire to fit against the surface of the wall 90 without becoming messy, maintaining the cleanliness of the wall surface of the base 9, and at the same time helping to protect the connection reliability of the connecting wire 17, making it less likely to be scratched and detached.

[0058] Of course, if the connector 1 is located on different sides, different wall surfaces can also be equipped with separate wire channels to store the connector 17.

[0059] Please continue to combine Figure 2-4 and Figure 10 As shown, in this embodiment, the electromagnetic unit 7 is installed from both sides of the base 9 into the internal mounting space 90a of the base 9 by sliding in. Sliding grooves 71 are provided on both sides of the bottom of the magnetic yoke assembly 70, and sliding rails 95 are provided in the base 9. The sliding process is achieved through the sliding grooves 71 and the sliding rails 95. To align the connecting portion 13a of the connector 1 with the opening 91, a limiting rib 93 is provided on the base 9 for positioning the electromagnetic unit 7. When the electromagnetic unit 7 slides into the mounting space 90a from both ends of the base 9 and abuts against the limiting rib 93, the connecting portion 13a of the connector 1 is aligned with the opening 91, allowing the plug terminal 15 of the external connecting wire 17 to be inserted through the opening 91.

[0060] After the electromagnetic unit 7 is installed, the end cap 13 and the power input conversion component 12 can be installed into the two ends of the base 9 respectively to complete the assembly process of the closed base 9.

[0061] Please continue to refer to this. Figure 2 and Figure 4 As shown, in this embodiment, the electromagnetic unit 7 is further provided with an elastic buckle 72, and the base 9 is provided with a corresponding slot 94 for the elastic buckle 72. When the electromagnetic unit 7 slides into the installation space 90a in the base 9 and the elastic buckle 72 reaches the position of the slot 94, the elastic buckle 72 pops out and engages with the slot 94. This can prevent the electromagnetic unit 7 from sliding again after being positioned in the base 9, which would cause the position of the connector 1 to shift, or from shaking and shifting during use, which would cause the plug terminal 15 to be subjected to force and affect the connection reliability.

[0062] Please continue to refer to this. Figure 7-8 As shown, the coil bracket 20 is provided with a fixing cavity 23 for mounting the connector 1. The connector 1 includes a fixing part 11, which is inserted into the fixing cavity 23. Its two side walls form an interference fit with the fixing cavity 23, and the fixing part 11 is also provided with barbed structures on both sides. This makes the connector 1 firmly fixed and prevents it from falling out and failing when the terminal 15 is disassembled or installed with reasonable external force.

[0063] Specifically, such as Figure 8 In the embodiment shown, the connector 1 includes the connecting part 13a, the wire end fixing part 12a for connecting with the wire of the coil 26, and the fixing part 11 for connecting with the coil bracket 20. The connector 1 is integrally formed, and the connecting part 13a and the fixing part 11 form a straight sheet structure. The wire end fixing part 12a is provided on one side of the straight sheet structure.

[0064] A cutout 26 is provided on one side of the fixed cavity 23, and the wire end fixing part 12a extends out of the cutout 26. When the coil 26 is wound with a wire, the wire (taking enameled wire as an example) can be temporarily fixed by wrapping the wire end fixing part 12a of the connector 1 several times. Then, the wire end of the enameled wire is welded to the wire end fixing part 12a by the welding process to achieve reliable fixing of the enameled wire. This winding process meets the needs of automated production, reduces production costs and improves the stability of coil quality.

[0065] The size of the fixed cavity 23 is larger than the size of the connecting part 13a, and a slot for accommodating the plug-in terminal 15 is formed between the fixed cavity 23 and the connecting part 13a.

[0066] For further improvements to this embodiment, please refer to Figure 6 As shown, the coil support 20 is also provided with a cover 5 for at least surrounding the wire end fixing portion 12a of the connector 1. Specifically, the cover 5 has a receiving cavity 52 that can surround the connector 1 on the coil support 20. By providing the cover 5, the wire end fixing portion 12a of the connector 1 does not need to be bent, and the cover 5 can directly surround the connector 1, thereby preventing tip discharge, increasing dielectric properties, and improving safety.

[0067] For further details, please refer to... Figure 6 and Figure 7 As shown, the coil bracket 20 is provided with a guide groove 22 on one side of the wire end fixing part 12, and the cover 5 is provided with a guide rib 51 corresponding to the guide groove 22. The cover 5 is connected by inserting the guide rib 51 into the guide groove 22.

[0068] Furthermore, please combine Figure 7 and Figure 9 As shown, in the insertion direction of the cover 5, the coil bracket 20 is also provided with a limiting protrusion 21. The insertion end of the cover 5 is provided with a limiting buckle 54 corresponding to the limiting protrusion 21. When the cover 5 is inserted, the limiting protrusion 21 and the limiting buckle 54 engage, which can prevent the cover 5 from loosening and sliding out.

[0069] Furthermore, to prevent the cover 5 from being affected by the up-and-down vibration of the product during operation, a first limiting rib 53 is provided at the insertion end of the cover 5, and a second limiting rib 24 is provided on the coil bracket 20. When the cover 5 is inserted, the first limiting rib 53 and the second limiting rib 24 mutually limit each other in a direction perpendicular to the insertion direction. This further ensures that the cover 5 does not vibrate up and down due to the vibration of the product during operation, thus preventing the cover 5 from slipping and failing.

[0070] Please continue to refer to this. Figures 10-14 As shown, a protective partition 16 is also provided at the bottom of the base 9 to increase the product's protective capabilities. Specifically, at least one protective partition 16 is added to the bottom of the contactor 10. The protective partition 16 is secured in the corresponding slot 96 of the base 9 by at least one clip 161 on it. The clip 16 is designed with one end suspended, which increases its elasticity and facilitates mold production. The suspended end is also higher than the surface of the protective partition 16, allowing the protruding clip rib 162 to be pressed by hand, deforming the clip rib 162 and thus disengaging the clip 161 from the slot 96 of the base 9, facilitating the removal of the protective partition.

[0071] The above describes the structure of the contactor and its electromagnetic system provided in this embodiment. Based on this embodiment, the electromagnetic unit is installed inside the base, and the electromagnetic unit is connected to form a coil assembly through the connecting wires outside the base. This solves the problems of inconvenience in assembly and movement caused by the need to connect the electromagnetic unit externally before installing it into the product, as well as the potential problems of broken wires and poor soldering during this process. It achieves the effect of allowing the static iron core assembly to be installed from both sides of the product base, connecting the coil externally, and ensuring stability and reliability.

[0072] In addition, the enameled wire of the coil can be automatically wound onto the pre-assembled and fixed terminal block, and the entry and exit ends of the enameled wire are fixed by welding. This eliminates the need for manual temporary fixation of the entry and exit ends of the enameled wire with tape, increases the connection reliability and stability of the coil components, and reduces the manufacturing cost of the coil components.

[0073] In addition, the device includes a connector comprising a fixing part, a welding part, and a plug-in connection part. The fixing part has a barbed structure and an interference fit with the cavity adapted to the coil, ensuring stable fixing of the connector. The welding part provides a fixing space for the entry and exit of the coil's enameled wire and fixes the enameled wire through a welding process. The plug-in connection part provides a structure that mates with quick-connect terminals, enabling the coil to be inserted from both sides of the contactor base and connected externally via quick-connect terminals. When using this connector, it only needs to be reversed and inserted into the coil frame fixing cavity, eliminating the need for an additional connector part and reducing mold investment.

[0074] Furthermore, the coil structure described above includes two covers, each positioned at one of the two terminals of the coil support. Each cover features a receiving cavity, two snap-fit ​​mechanisms, and a guide / limiting structure. The receiving cavity encloses the wire end fixing portion of the terminals, reducing the bending process required after welding, simplifying the application of coil welding terminals, lowering assembly costs, and increasing the dielectric properties of the terminals to prevent tip discharge. The snap-fit ​​mechanism matches the corresponding protruding structure on the coil frame, preventing the cover from detaching from the coil frame. The guide / limiting structure facilitates the positioning and assembly of the cover.

[0075] Furthermore, the aforementioned cover can be equipped with a limiting rib structure that is compatible with the coil firmware response slot, thereby preventing the product from coming off due to vibration during the on / off movement.

[0076] Finally, in this embodiment, at least one protective cover is added to the bottom to prevent the internal parts of the product from being exposed, isolate the risk of foreign objects entering, and improve the product's protective capabilities and reliability.

[0077] It should be noted that in the description of this invention, 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, or the orientation or positional relationship conventionally placed during use. They are used only for ease of description and do not indicate that the device or element referred to must have a specific orientation. Therefore, they should not be construed as limiting this invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating relative importance.

[0078] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the inventive concept, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. An electromagnetic system, comprising: A base (9) and at least two electromagnetic units (7) disposed within the base (9), the base (9) including a wall (90) forming an installation space (90a) for mounting the electromagnetic units (7); The electromagnetic unit (7) is characterized in that it includes a coil support (20) for winding a coil (26), and the coil support (20) is provided with a connecting piece (1) at the inlet end and the outlet end on one side of the wall (90), and the connecting piece (1) includes a connecting part (13a). The wall (90) is provided with an opening (91) at the position of the connecting part (13a) of the electromagnetic unit (7). The two electromagnetic units (7) pass through the opening (91) into the installation space (90a) through the connecting line (17) provided outside the wall (90) and connect with the connecting part (13a) to form a connection. The connecting line (17) includes a first connecting line (171), with plug terminals (15) at both ends corresponding to the shape of the connecting part (13a). The plug terminals (15) can be directly inserted into the connecting part (13a) to form a connection. One end of the first connecting line (171) is connected to the connecting part (13a) of the output end of an electromagnetic unit (7), and the other end of the first connecting line (171) is connected to the connecting part (13a) of the input end of another electromagnetic unit (7). The connecting line (17) further includes a second connecting line (172) and a third connecting line (173). The electromagnetic system includes a power input converter (12) disposed at the output end of the base (9). One end of the second connecting line (172) is connected to the connection part (13a) of the input end of an electromagnetic unit (7). The other end of the second connecting line (172) is connected to the first pole of the power input converter (12). One end of the third connecting line (173) is connected to the connection part (13a) of the output end of another electromagnetic unit (7). The other end of the third connecting line (173) is connected to the second pole of the power input converter (12).

2. The electromagnetic system according to any one of claims 1, characterized in that: The base (9) also includes a wire groove (14) disposed on the outside of the wall (90), and the connecting wire (17) is disposed in the wire groove (14).

3. The electromagnetic system according to claim 1, characterized in that: The base (9) is provided with a limiting rib (93) for positioning the electromagnetic unit (7).

4. The electromagnetic system according to claim 1, characterized in that: The electromagnetic unit (7) is provided with an elastic buckle (72), and the base (9) is provided with a slot (94) corresponding to the elastic buckle (72). When the electromagnetic unit (7) slides into the installation space (90a) in the base (9) and the elastic buckle (72) reaches the position of the slot (94), the elastic buckle (72) pops out and engages with the slot (94).

5. The electromagnetic system according to claim 1, characterized in that: The coil bracket (20) is provided with a fixing cavity (23) for installing the connector (1). The connector (1) includes a fixing part (11), which is inserted into the fixing cavity (23). Its two side walls are interference fit with the fixing cavity (23), and the fixing part (11) is also provided with barb structures on both sides.

6. The electromagnetic system according to claim 1, characterized in that: The connector (1) includes a wire end fixing part (12a) for connecting to the wire of the coil (26), and the coil support (20) is also provided with a cover (5) for at least surrounding the wire end fixing part (12a) of the connector (1).

7. The electromagnetic system according to claim 6, characterized in that: The coil bracket (20) is provided with a guide groove (22) on one side corresponding to the wire end fixing part (12a), and the cover (5) is provided with a guide rib (51) corresponding to the guide groove (22). The cover (5) is connected by inserting the guide rib (51) into the guide groove (22).

8. The electromagnetic system according to claim 7, characterized in that: In the insertion direction of the cover (5), the coil bracket (20) is also provided with a limiting protrusion (21), and the insertion end of the cover (5) is provided with a limiting buckle (54) corresponding to the limiting protrusion (21). When the cover (5) is inserted, the limiting protrusion (21) and the limiting buckle (54) engage.

9. The electromagnetic system according to claim 8, characterized in that: The insertion end of the cover (5) is also provided with a first limiting rib (53), and the coil bracket (20) is provided with a second limiting rib (24). When the cover (5) is inserted, the first limiting rib (53) and the second limiting rib (24) mutually limit each other in a direction perpendicular to the insertion direction.

10. The electromagnetic system according to claim 1, characterized in that: The base (9) is also provided with a protective partition (16) at the bottom.

11. A contactor, comprising an electromagnetic system (101), a contact system, and an arc-extinguishing system, characterized in that, The electromagnetic system (101) is the electromagnetic system described in any one of claims 1-10.

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