Linear motor

Abstract

The utility model discloses a linear motor, which comprises a stator and a rotor, and the stator or the rotor comprises an iron core, a coil winding, a first cooling pipe and a second cooling pipe. The iron core comprises a yoke part and a plurality of tooth parts arranged on the yoke part, first cooling grooves are formed in the side, opposite to the tooth parts, of the yoke part, and second cooling grooves are formed between the tooth parts. And the coil winding is wound on the tooth part. The first cooling pipe comprises a first coil pipe section arranged in the first cooling groove, and the first coil pipe section comprises a first heat conduction face in heat conduction contact with the iron core. The second cooling pipe comprises a second coil pipe section arranged in the second cooling groove, and the second coil pipe section comprises a fourth heat conduction face in heat conduction contact with the coil winding. At least one of the first thermally conductive surface and the fourth thermally conductive surface is configured to have a planar extension. Any one of the first coil pipe section and the second coil pipe section forms a plane extension part, so that the heat conduction contact area between the plane extension part and the yoke part of the iron core or the coil winding can be increased, and the cooling efficiency of the linear motor is improved.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a linear motor. Background Technology

[0002] Linear motors possess excellent characteristics such as high precision, high speed, high acceleration, and high efficiency, and are currently widely used in various production machinery and equipment. For linear motors with high thrust and high power requirements, the motor body is large, and the imbalance between heat generation and dissipation affects the motor's lifespan and performance, and in severe cases, may even burn out the motor.

[0003] When a linear motor is running, the heat generated mainly comes from the iron core and coil windings. Currently, linear motors generally use round tube-shaped cooling pipes to cool the iron core and coil windings. However, the contact area between the round tube-shaped cooling pipe and the iron core and coil windings is limited, making it difficult for heat to be transferred from the iron core and coil windings to the round tube-shaped cooling pipe. As a result, the cooling effect of the round tube-shaped cooling pipe on the linear motor is not ideal.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a linear motor that solves the problem of poor cooling effect of round tube cooling pipes on linear motors.

[0006] To achieve the above objectives, a specific embodiment of this utility model provides a linear motor, which includes a stator and a mover. The stator or mover includes an iron core, a coil winding, a first cooling pipe, and a second cooling pipe. The iron core includes a yoke and a plurality of teeth disposed on the yoke. A first cooling groove is formed on the side of the yoke facing away from the teeth, and a second cooling groove is formed between two adjacent teeth. The coil winding is wound on the teeth. The first cooling pipe includes a first coil section disposed within the first cooling groove, and the first coil section includes a first heat-conducting surface that is in thermal contact with the iron core. The second cooling pipe includes a second coil section disposed within the second cooling groove, and the second coil section includes a fourth heat-conducting surface that is in thermal contact with the coil winding. At least one of the first and fourth heat-conducting surfaces is configured to have a planar extension portion.

[0007] In one or more embodiments of this utility model, both the first heat-conducting surface and the fourth heat-conducting surface are constructed as planes.

[0008] In one or more embodiments of this utility model, the first heat-conducting surface is constructed as a plane, and the first heat-conducting surface is in heat-conducting contact with the bottom of the first cooling tank.

[0009] In one or more embodiments of this utility model, a base plate is provided on the side of the yoke facing away from the teeth, and the first coil section further includes a second heat-conducting surface that is in thermal contact with the base plate, the second heat-conducting surface being constructed as a plane.

[0010] In one or more embodiments of this utility model, an assembly groove is provided on the side of the base plate facing the yoke, and the first coil section is at least partially accommodated in the assembly groove. The bottom surface of the assembly groove is constructed to be in thermal contact with the second heat-conducting surface.

[0011] In one or more embodiments of this utility model, the fourth heat-conducting surface is constructed as a plane, and the surface of the coil winding that is in thermal contact with the fourth heat-conducting surface is constructed as a plane.

[0012] In one or more embodiments of the present invention, the second cooling pipe further includes a fifth heat-conducting surface that is in thermal contact with the bottom of the second cooling tank, and the fifth heat-conducting surface is configured as a plane.

[0013] In one or more embodiments of the present invention, the first cooling pipe further includes a first straight pipe section that communicates with the first coil section and extends along the arrangement direction of the teeth. The first straight pipe section includes a third heat-conducting surface that is in thermal contact with the side end of the coil winding. The third heat-conducting surface is configured as a plane.

[0014] In one or more embodiments of the present invention, the second cooling pipe further includes a second straight pipe section that communicates with the second coil section and extends along the arrangement direction of the teeth. The second straight pipe section includes a sixth heat-conducting surface that is in thermal contact with the side end of the coil winding. The sixth heat-conducting surface is configured as a plane.

[0015] In one or more embodiments of this utility model, the first straight tube segment and the second straight tube segment are respectively located on both sides of the coil winding that are arranged opposite to each other.

[0016] In one or more embodiments of this utility model, a first thermally conductive silicone layer is provided on the wall of the first cooling tank.

[0017] In one or more embodiments of this utility model, a second thermally conductive silicone layer is provided on the wall of the second cooling tank.

[0018] In one or more embodiments of this utility model, the first coil section is embedded in the first cooling tank.

[0019] In one or more embodiments of this utility model, the second coil section is embedded in the second cooling tank.

[0020] Compared with the prior art, the fact that either the first coil section or the second coil section of this utility model forms a planar extension portion can increase the thermally conductive contact area with the yoke of the iron core or the coil winding, thereby improving the cooling efficiency of the linear motor. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional view of the stator or mover of a linear motor in one embodiment of the present invention;

[0023] Figure 2 This is a side view of the iron core in one embodiment of the present invention;

[0024] Figure 3 This is an exploded structural diagram of the stator or mover of a linear motor in one embodiment of this utility model;

[0025] Figure 4 This is a three-dimensional structural view of the first cooling pipe in one embodiment of the present invention;

[0026] Figure 5 This is a three-dimensional structural diagram of the second cooling pipe in one embodiment of the present invention;

[0027] Figure 6 This is a three-dimensional structural diagram of the first cooling pipe and the second cooling pipe in one embodiment of the present invention;

[0028] Figure 7 This is a cross-sectional view of the base plate in one embodiment of the present invention;

[0029] Figure 8 This is a side view of the stator or mover of a linear motor in one embodiment of the present invention.

[0030] Explanation of main reference numerals: 1. Iron core, 11. Yoke, 12. Tooth, 13. First cooling groove, 14. Second cooling groove, 15. T-slot, 2. Coil winding, 3. First cooling pipe, 31. First coil section, 311. First heat-conducting surface, 312. Second heat-conducting surface, 32. First straight pipe section, 321. Third heat-conducting surface, 4. Second cooling pipe, 41. Second coil section, 411. Fourth heat-conducting surface, 412. Fifth heat-conducting surface, 42. Second straight pipe section, 421. Sixth heat-conducting surface, 5. Base plate, 51. Assembly groove, 6. T-strip. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0032] In the description of this utility model, it should be understood that the terms "top", "bottom", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In one embodiment, reference is made to Figures 1 to 5 As shown, this embodiment provides a linear motor, which includes a stator and a mover. The stator includes an iron core 1, a coil winding 2, a first cooling pipe 3, a second cooling pipe 4, and a base plate 5.

[0035] Specifically, the iron core 1 is mounted on the base plate 5. The iron core 1 includes a yoke 11 connected to the base plate 5 and a plurality of teeth 12 disposed on the yoke 11. A first cooling groove 13 is formed on the side of the yoke 11 facing away from the teeth 12, and a second cooling groove 14 is formed between two adjacent teeth 12. The coil winding 2 is wound on the teeth 12. The first cooling pipe 3 includes a first coil section 31 embedded in the first cooling groove 13. The first coil section 31 is generally constructed as a serpentine coil. The second cooling pipe 4 includes a second coil section 41 embedded in the second cooling groove 14. The second coil section 41 is generally constructed as a serpentine coil.

[0036] In one embodiment, reference is made to Figure 1 , Figure 3 and Figure 4As shown, the first coil section 31 includes a first heat-conducting surface 311 and a second heat-conducting surface 312 arranged opposite to each other. Both the first heat-conducting surface 311 and the second heat-conducting surface 312 are constructed as planes. The first heat-conducting surface 311 is in contact with and adheres to the bottom surface of the first cooling tank 13. The bottom surface of the first cooling tank 13 is also constructed as a plane. The second heat-conducting surface 312 is in contact with and adheres to the side of the base plate 5 facing the iron core 1.

[0037] After the first heat-conducting surface 311 and the second heat-conducting surface 312 are formed on the first coil section 31, the cross-sectional shape of the first coil section 31 can be constructed to be similar to a rectangle. When the area of ​​the pipe cross-section is constant, the perimeter of the cross-section of the first coil section 31 is significantly larger than the perimeter of the cross-section of a traditional circular pipe, thereby increasing the contact area between the first coil section 31 and the yoke 11 of the iron core 1 and the base plate 5, and improving the cooling efficiency of the first coil section 31 on the yoke 11 of the iron core 1 and the base plate 5.

[0038] In one embodiment, reference is made to Figure 3 and Figure 4 As shown, the first cooling pipe 3 also includes a first straight pipe section 32. The first cooling pipe 3 extends along the arrangement direction of the teeth 12. One end of the first straight pipe section 32 is connected to the first coil section 31, and the other end of the first straight pipe section 32 is constructed as an open shape, serving as a water inlet or water outlet.

[0039] Furthermore, to increase the cooling efficiency of the first cooling pipe 3 for the linear motor, a third heat-conducting surface 321 is formed on the first straight pipe section 32. The third heat-conducting surface 321 is in contact with the side end of the coil winding 2, and the third heat-conducting surface 321 is constructed as a plane. Through the third heat-conducting surface 321, part of the heat generated by the coil winding 2 is transferred to the first cooling pipe 3, thereby further improving the cooling efficiency of the first cooling pipe 3 for the linear motor.

[0040] In one embodiment, reference is made to Figure 7 As shown, a mounting groove 51 is provided on the side of the base plate 5 facing the yoke 11. The cross-sectional shape of the mounting groove 51 is adapted to the cross-sectional shape of the first coil section 31. The first coil section 31 is at least partially accommodated in the mounting groove 51. The bottom surface of the mounting groove 51 is constructed to be in thermal contact with the second heat-conducting surface 312. Compared to the first coil section 31 directly contacting the base plate 5, the mounting groove 51 can increase the contact area between the first coil section 31 and the base plate 5, so that the temperature at the mounting surface of the linear motor (i.e., the surface of the base plate 5) will not be too high. This ensures that the heat generated by the motor will not be transferred to the machine tool table in large quantities, and will not have a thermal impact on the machine tool table, thus ensuring the accuracy of the machine tool.

[0041] In one embodiment, reference is made to Figure 1As shown, a T-shaped groove 15 is provided on the side of the yoke 11 of the iron core 1 facing away from the tooth 12. A T-shaped strip 6 that matches the shape of the T-shaped groove 15 is installed in the T-shaped groove 15. A bolt passes through the base plate 5 from the side of the base plate 5 facing away from the yoke 11 and is threaded into the inside of the T-shaped strip 6, thereby fixing the iron core 1 and the base plate 5 together.

[0042] Optionally, multiple T-slots 15 and T-strips 6 are provided, and they are matched one-to-one with each other, and the arrangement direction of both is parallel to the arrangement direction of the teeth 12.

[0043] In one embodiment, the wall of the first cooling tank 13 is coated with thermally conductive silicone, and after the thermally conductive silicone solidifies, a first thermally conductive silicone layer is formed on the wall of the first cooling tank 13.

[0044] In one embodiment, reference is made to Figure 1 and Figure 5 As shown, the second coil section 41 includes a fourth heat-conducting surface 411 and a fifth heat-conducting surface 412 disposed opposite to each other. Both the fourth heat-conducting surface 411 and the fifth heat-conducting surface 412 are constructed as planes. The fourth heat-conducting surface 411 makes thermal contact with the coil winding 2, and the surface of the coil winding 2 in thermal contact with the fourth heat-conducting surface 411 is constructed as a plane. The fifth heat-conducting surface 412 makes thermal contact with the bottom of the second cooling tank 14, and the bottom of the second cooling tank 14 is also constructed as a plane.

[0045] In one embodiment, reference is made to Figure 5 As shown, the second cooling pipe 4 also includes a second straight pipe section 42, which is connected to the second coil section 41 and extends along the arrangement direction of the teeth 12. The second straight pipe section 42 includes a sixth heat-conducting surface 421 that is in thermal contact with the side end of the coil winding 2. The sixth heat-conducting surface 421 is constructed as a plane.

[0046] Furthermore, the third heat-conducting surface 321 of the first straight pipe section 32 and the sixth heat-conducting surface 421 of the second straight pipe section 42 are disposed on opposite sides of the coil winding 2.

[0047] In one embodiment, the wall of the second cooling tank 14 is coated with thermally conductive silicone, and after the thermally conductive silicone solidifies, a second thermally conductive silicone layer is formed on the wall of the second cooling tank 14.

[0048] In one embodiment, reference is made to Figure 4 and Figure 6 As shown, there are several ways to form the first heat-conducting surface 311, the second heat-conducting surface 312, and the third heat-conducting surface 321 on the first coil section 31. One way is to flatten the arc surface of the circular pipe into a plane from the side to form a structure similar to the first coil section 31. Another way is to directly use a flat serpentine coil as the first coil section 31.

[0049] Similarly, refer to Figure 5 and Figure 6 As shown, the method of forming the fourth heat-conducting surface 411, the fifth heat-conducting surface 412, and the sixth heat-conducting surface 421 on the second coil section 41 is the same as described above.

[0050] In one embodiment, reference is made to Figure 8 As shown, there are two of each of the first cooling pipe 3 and the second cooling pipe 4, and the two first cooling pipes 3 and the two second cooling pipes 4 are distributed in a mirror image along the vertical direction.

[0051] In one embodiment, the structure of the mover is the same as, similar to, partially the same as, or partially similar to the structure of the stator.

[0052] In another embodiment, the structure of the mover may also be different from that of the stator, with only one of the stator and the mover adopting the structural design described in the above embodiment.

[0053] It should be noted that the shapes of the first heat-conducting surface 311, the second heat-conducting surface 312, the third heat-conducting surface 321, the fourth heat-conducting surface 411, the fifth heat-conducting surface 412, and the sixth heat-conducting surface 421 in the above embodiments are conventional choices in actual applications. For those skilled in the art, without departing from the technical principles of this application, adaptive adjustments can be made to the above heat-conducting surfaces, and only a portion of the above heat-conducting surfaces can be constructed as planes (i.e., only a portion of the above heat-conducting surfaces are planar). This should also be considered within the scope of protection of this application.

[0054] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A linear motor, characterized in that, The linear motor includes a stator and a mover, wherein the stator or mover includes: The iron core (1) includes a yoke (11) and a plurality of teeth (12) disposed on the yoke (11). A first cooling groove (13) is provided on the side of the yoke (11) facing away from the teeth (12), and a second cooling groove (14) is formed between two adjacent teeth (12). The coil winding (2) is wound on the toothed portion (12); The first cooling pipe (3) includes a first coil section (31) disposed in the first cooling tank (13), and the first coil section (31) includes a first heat-conducting surface (311) that is in thermal contact with the iron core (1). The second cooling pipe (4) includes a second coil section (41) disposed in the second cooling tank (14), and the second coil section (41) includes a fourth heat-conducting surface (411) that is in thermal contact with the coil winding (2). At least one of the first heat-conducting surface (311) and the fourth heat-conducting surface (411) is configured to have a planar extension portion.

2. The linear motor according to claim 1, characterized in that, Both the first heat-conducting surface (311) and the fourth heat-conducting surface (411) are constructed as planes.

3. The linear motor according to claim 1, characterized in that, The first heat-conducting surface (311) is constructed as a plane, and the first heat-conducting surface (311) is in heat-conducting contact with the bottom of the first cooling tank (13).

4. The linear motor according to claim 1, characterized in that, The yoke (11) has a base plate (5) on the side opposite to the tooth (12), and the first coil section (31) also includes a second heat-conducting surface (312) that is in thermal contact with the base plate (5). The second heat-conducting surface (312) is constructed as a plane.

5. The linear motor according to claim 4, characterized in that, The bottom plate (5) has an assembly groove (51) on the side facing the yoke (11), and the first coil section (31) is at least partially housed in the assembly groove (51). The bottom surface of the assembly groove (51) is constructed to be in thermal contact with the second heat-conducting surface (312).

6. The linear motor according to claim 1, characterized in that, The fourth heat-conducting surface (411) is constructed as a plane, and the surface of the coil winding (2) that is in thermal contact with the fourth heat-conducting surface (411) is constructed as a plane.

7. The linear motor according to claim 1, characterized in that, The second cooling pipe (4) also includes a fifth heat-conducting surface (412) that is in thermal contact with the bottom of the second cooling tank (14), and the fifth heat-conducting surface (412) is constructed as a plane.

8. The linear motor according to claim 1, characterized in that, The first cooling pipe (3) further includes a first straight pipe section (32) that communicates with the first coil section (31) and extends along the arrangement direction of the teeth (12). The first straight pipe section (32) includes a third heat-conducting surface (321) that is in thermal contact with the side end of the coil winding (2). The third heat-conducting surface (321) is constructed as a plane. The second cooling pipe (4) further includes a second straight pipe section (42) that communicates with the second coil section (41) and extends along the arrangement direction of the teeth (12). The second straight pipe section (42) includes a sixth heat-conducting surface (421) that is in thermal contact with the side end of the coil winding (2). The sixth heat-conducting surface (421) is configured as a plane.

9. The linear motor according to claim 8, characterized in that, The first straight pipe section (32) and the second straight pipe section (42) are located on opposite sides of the coil winding (2).

10. The linear motor according to claim 1, characterized in that, The first cooling tank (13) has a first thermally conductive silicone layer on its tank wall; and / or, The second cooling tank (14) has a second thermally conductive silicone layer on its tank wall; and / or, The first coil section (31) is embedded in the first cooling tank (13); and / or, The second coil section (41) is embedded in the second cooling tank (14).

Images