Cooling System for Linear Motor and Linear Motor

Abstract

To provide a cooling system for a linear motor and a linear motor that can improve the heat dissipation efficiency and operating efficiency of the linear motor.SOLUTION: A linear motor mover 6 includes a motor silicon steel plate, an iron core is connected to the bottom of the motor silicon steel plate, a coil winding is wound around the iron core, a liquid cooling plate is installed on the top of the motor silicon steel plate, and a thermally conductive interface material is provided between the contact surface of the motor silicon steel plate and the liquid cooling plate. A heat dissipation fin is installed inside the liquid cooling plate, and a flow path is formed in the heat dissipation fin through which a cooling medium flows, and a liquid inlet and a liquid outlet are provided inside the liquid cooling plate, and the liquid inlet and the liquid outlet respectively penetrate the flow path formed in the heat dissipation fin. According to the present invention, the heat dissipation state of the internal winding of the flat linear motor can be improved and the temperature of the motor winding can be reduced.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation of motors, and particularly to a cooling system for a linear motor and a linear motor.

Background Art

[0002] Permanent magnet linear motors have great advantages such as high thrust density, high acceleration, high speed, high precision, and high efficiency, and are widely used in high-precision CNC systems, photolithography systems, etc.

[0003] In order to increase the thrust density and achieve high-acceleration operation, it is usually necessary to pass a larger current density, resulting in increased losses. These losses become heat sources, causing the motor temperature to rise rapidly, which may exceed the insulation temperature rise limit of the motor winding and the temperature rise limit of the permanent magnet material. If protection and preventive measures are not taken, the insulation material of the motor may deteriorate due to high temperature, the structure may deform, and the permanent magnet material may demagnetize or lose its magnetism. As a result, high-temperature parts accumulate and diffuse in the motor winding and back iron, causing the motor to be completely damaged and inoperable. Therefore, it is very necessary to install a cooling system in the motor that can suppress the temperature rise of the motor, improve the overload capacity and continuous thrust output of the motor under various operating conditions, and ensure safe operation.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In view of the problem that the heat dissipation ability of the linear motor in the prior art is insufficient, the present invention provides a cooling system for a linear motor and a linear motor that can improve the heat dissipation efficiency and operating efficiency of the linear motor.

[0005] To achieve the above object, the present invention adopts the following technical solutions. A cooling system for a linear motor, It includes a mover, and the mover includes a silicon steel sheet for motor. A core is connected to the bottom of the silicon steel sheet for motor, a coil winding is wound around the core, a liquid cooling plate is installed at the top of the silicon steel sheet for motor, a thermally conductive interface material is provided between the contact surface of the silicon steel sheet for motor and the liquid cooling plate, heat dissipation fins are installed inside the liquid cooling plate, and a flow path through which a cooling medium flows is formed in the heat dissipation fins. A liquid inlet and a liquid outlet are provided inside the liquid cooling plate, and the liquid inlet and the liquid outlet respectively penetrate through the flow paths formed in the heat dissipation fins.

[0006] In the above linear motor cooling system, further, the liquid cooling plate and the silicon steel sheet for motor are in surface contact.

[0007] In the above linear motor cooling system, further, a cover plate is installed at the upper end of the liquid cooling plate, a bottom plate is provided at the lower end of the liquid cooling plate, and the heat dissipation fins are installed between the cover plate and the bottom plate.

[0008] In the above linear motor cooling system, further, the liquid inlet and the liquid outlet are respectively installed on the side surface of the cover plate.

[0009] In the above linear motor cooling system, further, the cross section of the heat dissipation fins is any one of concave-convex type, mountain type, corrugated type, porous shape, and zigzag shape.

[0010] In the above linear motor cooling system, further, the flow paths through which the cooling medium flows form a plurality of unit flow paths arranged in parallel. The number of unit flow paths on the liquid inlet side is the same as the number of unit flow paths on the liquid outlet side, and the liquid inlet side and the liquid outlet side of the unit flow paths are respectively communicated with the liquid inlet and the liquid outlet.

[0011] In the above linear motor cooling system, further, the unit flow paths are arranged on the same horizontal plane, and the unit flow paths are arranged as linear flow paths.

[0012] In the above linear motor cooling system, further, the flow path through which the cooling medium flows is a U-shaped return flow path.

[0013] In the above linear motor cooling system, further, the heat-conductive interface material is heat-conductive silicone grease, the cooling medium is water, and the liquid-cooled plate is made of an aluminum alloy.

[0014] A linear motor provided with the above cooling system, further including a stator that cooperates with the mover, the mover being slidably installed in the stator, the stator including magnetic steel and a guide rail, and the magnetic steel being laid along the length direction of the guide rail.

Advantages of the Invention

[0015] Compared with the prior art, the advantageous effects of the present invention are as follows: The present invention combines research on geometric parameters, electromagnetic performance, and operating conditions to design a removable liquid-cooled plate suitable for a linear motor. Among them, the liquid-cooled plate is installed on the silicon steel sheet of the motor, and a heat-conductive interface material is installed on the bottom plate side of the liquid-cooled plate to reduce the thermal resistance during element surface contact and is used to enhance the effective transmission of heat. The liquid-cooled plate indirectly transfers the huge heat from the coil winding to the cooling medium enclosed in the circulation pipe, and removes the heat through the cooling medium. The cooling medium enters the liquid-cooled plate from the liquid inlet, flows out from the liquid outlet through the heat-dissipating fins installed on the liquid-cooled plate, and takes away the heat. The cooling medium flowing out of the liquid-cooled plate is cooled by an external cooling system and then sent back to the liquid-cooled plate for circulation and cooling.

[0016] On the one hand, a plurality of groups of extended surface structures (heat-dissipating fins) are provided inside the liquid-cooled plate, and the heat exchange density can be greatly increased by adopting a rib surface shape that promotes convective heat transfer with a smaller equivalent diameter of the cooling channel.

[0017] Among them, considering the complex operation modes of the motor, when the motor is in a low-performance mode such as low load or low speed, the liquid cooling plate can be removed to improve energy efficiency. When the motor is in a high-load, high-precision, high-acceleration, or other high-performance modes, the liquid cooling plate can effectively solve the problem of thermal runaway, ensure the reliable operation of the motor, and also, due to the design of the liquid cooling plate that can be quickly disassembled, the difficulty and cost of using and assembling the machine are further reduced. In summary, the cooling system can prevent heat from accumulating in the motor during long-term operation and meet the requirements of motor weight reduction and miniaturization. In addition, the heat dissipation structure is simple and easy to disassemble, with the advantages of energy saving and low cost.

Brief Description of the Drawings

[0018] To more clearly explain the technical solutions in the embodiments of the present invention, the drawings used in this embodiment will be briefly introduced. However, the drawings in the following description are only a part of the embodiments of this application, and those skilled in the art can also obtain other drawings based on these drawings without creative efforts.

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Modes for Carrying Out the Invention

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of this application.

[0020] Example It should be noted that the terms such as "first" and "second" in the specification, claims and the above drawings of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Understand that the data used in this way is interchangeable under appropriate circumstances so that the embodiments of the present invention described in this specification can be implemented in an order other than those illustrated or described in this specification. Furthermore, the terms "including" and "having" in the embodiments of the present invention and all their variations are intended to include non-exclusive inclusion. For example, it includes a process, method, system, product, or equipment composed of a series of steps or units, and is not necessarily limited to the explicitly listed steps or elements, and may also include other steps or elements not explicitly listed or inherent to the process, method, product, or device.

[0021] The orientation or positional relationship indicated by "center", "vertical", "horizontal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of explaining the present invention and simplifying the description, and is not intended to indicate or imply that the device or component mentioned must have a specific orientation and be constructed and operated in a specific orientation. Therefore, it should not be construed as limiting the present invention.

[0022] In the description of the present invention, unless otherwise explicitly limited, "a plurality" means at least two, such as two, three, etc. Also, unless otherwise clearly described and limited, the terms "installation", "connection", and "attachment" should be understood in a broad sense. For example, there may be a fixed connection, a removable connection, or an integral connection, which may be a mechanical connection, an electrical connection, and may be a direct connection, an indirect connection via a medium, or an internal connection between two components. A person skilled in the art can understand the specific meaning of the above terms in the present invention on a case-by-case basis.

[0023] In the present invention, unless otherwise specified and limited, the fact that the first feature is "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are indirectly in contact via an intermediate medium. Also, the fact that the first feature is "above", "above", or "upper side" of the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply that the first feature is higher in the horizontal direction than the second feature. The fact that the first feature is "below", "below", or "lower side" of the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply that the first feature is lower in the horizontal direction than the second feature.

[0024] Unless otherwise defined, the technical terms and scientific terms used in this specification have the same meaning as generally understood by those skilled in the technical field to which the present invention belongs. The terms used in this specification in the description of the present invention are for the purpose of describing a specific embodiment and are not intended to limit the present invention.

[0025] Referring to FIGS. 1 to 8, an embodiment of the present invention discloses a cooling system for a linear motor and a linear motor. The linear motor includes a stator 7 and a mover 6 that cooperate with each other. The mover 6 is slidably installed within the stator 7 and further includes a silicon steel sheet 3 for the motor. At the bottom of the silicon steel sheet 3 for the motor, a core 9 is connected, and a coil winding 8 is wound around the core 9. Between the contact surface of the silicon steel sheet 3 for the motor and the liquid cooling plate 2, a thermally conductive silicone grease 4 is provided. At both ends of the upper middle part of the cover plate 1 of the liquid cooling plate 2, a liquid inlet 18 and a liquid outlet 19 are provided. The liquid inlet 18 and the liquid outlet 19 respectively penetrate into the internal flow path of the heat dissipation fins 11. Inside the heat dissipation fins 11, there is a cooling medium that can exchange heat with the motor through the liquid cooling plate 2 and the thermally conductive silicone grease 4. Among them, the liquid cooling plate 2 is fixed to the silicon steel sheet 3 for the motor via fixing screws 10. Here, the liquid cooling plate 2 is locked and fixed on the silicon steel sheet 3 for the motor via fixing screws 10.

[0026] Specifically, the liquid cooling plate 2 in this embodiment indirectly transfers a huge amount of heat from the coil winding 8 to the cooling medium enclosed in the circulation pipe, and removes the heat through the cooling medium. The cooling medium enters the liquid cooling plate 2 from the liquid inlet 18, flows out from the liquid outlet 19 through the heat dissipation fins 11 installed on the liquid cooling plate 2, and takes away the heat. The cooling medium flowing out from the liquid cooling plate 2 is cooled by an external cooling system and then sent back to the liquid cooling plate 2 again for circulation and cooling.

[0027] On the one hand, a plurality of groups of extended surface structures (heat dissipation fins 11) are provided inside the liquid cooling plate 2, and the heat exchange density can be greatly increased by adopting a rib surface shape that promotes convective heat transfer with a smaller equivalent diameter of the cooling channel. On the other hand, the convective heat transfer coefficient of the cooling medium such as water or oil used is much larger than that of normal air. Therefore, the liquid cooling plate 2 can very efficiently remove the ohmic heat generated by the winding assembly during operation from the coil winding 8.

[0028] Referring to FIG. 1, in some embodiments, the stator 7 includes a magnetic steel 14 and a guide rail 13. The magnetic steel 14 is disposed on the guide rail 13 along the length direction of the guide rail 13, and the mover 6 moves linearly along the length direction of the stator 7.

[0029] In some embodiments, since the liquid cooling plate 2 and the silicon steel sheet 3 for the motor are in surface contact, the heat transfer path area becomes large, and the heat dissipation effect of the motor is sufficiently ensured.

[0030] Referring to FIG. 4, in some embodiments, a heat conduction layer is provided between the silicon steel sheet 3 for the motor and the liquid cooling plate 2. Among them, by filling the gap between components with a thermally conductive interface material, the contact thermal resistance between devices can be reduced, and the heat transfer efficiency can be further improved. Preferably, the material of the heat conduction layer is a heat conduction pad or a heat conduction silicone grease. In this implementation example, since the thermally conductive interface material filled between the bottom plate 5 of the liquid cooling plate 2 and the silicon steel sheet 3 for the motor is the thermally conductive silicone grease 4, the local contact area is large, the required filling material is more, and the range is wider. The thermally conductive silicone grease 4 has characteristics such as high thermal conductivity, excellent insulation, low oil separation property, high temperature resistance, and self-adjustable scraping shape. The area covered by the thermally conductive silicone grease 4 can avoid the position of the mounting hole, so the difficulty of assembly is reduced. In addition, since the thickness of the thermally conductive silicone grease 4 can be applied very thinly, the thermal resistance during heat transfer is greatly reduced.

[0031] In some embodiments, a cover plate 1 is installed at the upper end of the liquid cooling plate 2, heat dissipation fins 11 are provided inside the liquid cooling plate 2, and a bottom plate 5 is provided at the lower end of the liquid cooling plate 2. The split assembly design is advantageous for the flow path design and space utilization inside the liquid cooling plate 2 on the one hand, and can reduce the manufacturing difficulty and cost of the product on the other hand, as shown in FIG. 4.

[0032] In some embodiments, the shape of the liquid cooling plate 2 is a flat shape, which can maximize the contact with the heat source and make the most of the high thermal conductivity of the liquid cooling plate 2. Optionally, since the liquid cooling plate 2 has a flat shape, the liquid cooling plate 2 is thin and light, thereby reducing the modification of the motor structure and achieving the lightweight design goal while improving the heat dissipation performance of the motor.

[0033] Referring to FIG. 4, in some embodiments, the liquid cooling plate 2 is provided with a liquid inlet 18 and a liquid outlet 19. Both the liquid inlet 18 and the liquid outlet 19 communicate with the heat dissipation fins 11. The liquid inlet 18 and the liquid outlet 19 are installed at both ends of the upper central part of the cover plate 1. The liquid cooling plate 2 indirectly transfers a large amount of heat from the coil winding 8 to the cooling medium enclosed in the circulation pipe, and takes away the heat through the cooling medium. The cooling medium enters the liquid cooling plate 2 from the liquid inlet 18, flows out from the liquid outlet 19 through the heat dissipation fins 11 provided on the liquid cooling plate 2, takes away the heat, as shown in FIG. 8. The cooling medium flowing out of the liquid cooling plate 2 is cooled by an external cooling system and then sent back to the liquid cooling plate 2 for circulating cooling. A plurality of groups of extended surface structures (heat dissipation fins 11) are provided inside the liquid cooling plate 2, and the heat exchange density can be greatly increased by adopting a rib surface shape that promotes convective heat transfer with a smaller equivalent diameter of the cooling channel.

[0034] In some embodiments, the shape of the heat dissipation fins 11 inside the liquid cooling plate 2 is "concave-convex type". The critical Reynolds number of the fluid in the microchannels with different cross-sections is much smaller than the Reynolds number of the fluid in the conventional channels, which means that the flow of the fluid in the microchannels may easily reach turbulent flow. This is also the reason why the added microchannels in the liquid cooling plate 2 have a strong heat dissipation ability, as shown in FIG. 5.

[0035] Optionally, the fins are a major component of the liquid cooling plate 2 and are a basic part of the extended surface of the liquid cooling plate 2. The structural shape thereof can be selected from concave-convex type, mountain type, corrugated, porous shape, zigzag-shaped fins, as shown in FIG. 6. Different rib structures result in different characteristics. The concave-convex type ribs have a high heat transfer capacity due to their small equivalent diameter, but the length of the flow path greatly affects the heat transfer effect, and the heat transfer rate and resistance are smaller compared to other shaped fins. The zigzag-shaped fins can separate the boundary layer and promote the turbulent flow of the fluid, thereby enhancing heat transfer, but the resistance is large. The porous-shaped fins can break the thermal boundary layer, disperse the fluid more uniformly within the fins, and enhance heat transfer in the transition zone and turbulent zone. In this embodiment, concave-convex type fins are selected, but the use is not limited to this shape.

[0036] In some embodiments, the height and width of the heat dissipation fins 11 exactly match the internal space of the liquid cooling plate 2, so that the cooling medium can flow as uniformly as possible within the fins, improving the utilization efficiency of the heat dissipation fins 11 inside the liquid cooling plate 2 and enhancing the heat exchange capacity of the liquid cooling plate 2.

[0037] In some embodiments, the heat dissipation fins 11 are provided with a plurality of unit flow paths arranged in parallel. The number of unit flow paths at the liquid inlet 18 and the liquid outlet 19 is the same. The liquid inlet end and the liquid outlet end of the unit flow path communicate with the corresponding liquid inlet 18 and liquid outlet 19 respectively. Through a reasonable flow path design, the occurrence of extreme phenomena such as circulation bypass, backflow, and flow blockage in the flowing process of the internal cooling medium is reduced, as shown in FIG. 7. Among them, by using the conversion joint 12 and the soft rubber pipe 15 at the liquid inlet end and the liquid outlet end of the liquid cooling plate 2, the exposed parts of the cooling system can be flexibly arranged in multiple directions, or can be directly arranged in the tank chain assembly together with the motor electrical signal transmission line, reducing the additional interference caused by the operation of the motor by the cooling system.

[0038] In some embodiments, the unit flow paths are arranged on the same horizontal plane, and the unit flow paths are linear flow paths to reduce the resistance in the flowing process of the cooling medium.

[0039] Referring to FIG. 7, in some embodiments, the flow circuit of the cooling medium inside the bottom plate 5 of the liquid cooling plate 2 is a "U"-shaped return flow path. Here, in order for the cooling medium to sufficiently and reasonably exchange heat with the heat dissipation fins 11 of the liquid cooling plate 2, a water storage groove 16 and a return flow groove 17 are installed inside the liquid cooling plate 2. It can be understood that due to the design of the combination of the flow paths, the heat distribution of the motor becomes more uniform, and the utilization rate of the flow path space of the liquid cooling plate 2 is effectively improved.

[0040] In some embodiments, the cooling medium may be water. Specifically, the characteristics of the cooling medium also have an important impact on the heat dissipation effect of the liquid cooling plate 2. When selecting the cooling medium, mainly the thermal, physical, electrical characteristics, compatibility, and economy of the cooling medium are considered. Since the fluid does not directly contact the electronic components in the liquid cooling plate 2, the conductivity of the cooling medium is not considered, and mainly its corrosiveness and thermal characteristics are considered. Considering various factors, the cooling medium used in this embodiment is water.

[0041] In some embodiments, the liquid cooling plate 2 uses an aluminum alloy material. Specifically, the base material of the liquid cooling plate 2 uses plates such as copper and aluminum with good normal thermal conductivity. Although copper has a high thermal conductivity, considering the high requirements for the motion performance and load performance of the motor, in the selection of the material of the cooling system, it is necessary to consider the balance between thermal conductivity and quality. Therefore, in this embodiment, an aluminum alloy material with low material cost, light weight, mature manufacturing technology, and excellent thermal conductivity is used.

[0042] In some embodiments, the installation position of the liquid cooling plate 2 is directly above the coil winding 8. When the linear motor operates, the coil winding 8 generates heat and becomes hot, and the heat is transmitted to the motor silicon steel sheet 3 through the iron core 9. However, the central part is the region where the heat accumulation is the most intense. Through the design of the arrangement, shape, and installation position of the liquid cooling plate 2, the rapid and efficient secondary transmission of heat can be maximally enhanced, the heat exchange ability between the motor and the outside can be improved, and the temperature rise of the coil winding 8 can be reduced.

[0043] In some embodiments, the liquid cooling plate 2 adopts a detachable structural design and uses fixing screws 10 to lock and fix the liquid cooling plate 2 on the silicon steel plate 3 for the motor. Considering the complex operation mode of the motor, when the motor is in a low-performance mode such as low load or low speed, the liquid cooling plate 2 can be removed to improve energy efficiency. When the motor is in a high-performance mode such as high load, high precision, high acceleration, etc., the liquid cooling plate 2 can well solve the problem of thermal runaway, ensure the reliable operation of the motor, and also, the design of the liquid cooling plate 2 that can be quickly disassembled further reduces the difficulty and cost of the use and assembly of the machine, as shown in FIG. 2.

[0044] In summary, through the research on the geometric parameters, electromagnetic performance and operating conditions of the motor, the present invention designs a detachable liquid cooling plate 2 suitable for the linear motor. The liquid cooling plate 2 is installed on the silicon steel plate 3 for the motor. Among them, a heat-conductive interface material is installed on the bottom plate 5 side of the liquid cooling plate 2 and is used to reduce the thermal resistance during surface contact between parts and strengthen the effective transmission of heat. The liquid cooling plate 2 indirectly transfers the huge heat from the coil winding 8 to the cooling medium enclosed in the circulation pipe and removes the heat through the cooling medium. The cooling medium enters the liquid cooling plate 2 from the liquid inlet 18, flows out from the liquid outlet 19 through the heat dissipation fins 11 installed on the liquid cooling plate 2, and takes away the heat. The cooling medium flowing out of the liquid cooling plate 2 is cooled by an external cooling system and then sent back to the liquid cooling plate 2 again for circulation and cooling.

[0045] On the one hand, a plurality of groups of extended surface structures (heat dissipation fins 11) are provided inside the liquid cooling plate 2, and the heat exchange density can be greatly increased by adopting a rib surface shape that promotes convective heat transfer with a smaller equivalent diameter of the cooling channel. On the other hand, the convective heat transfer coefficient of the cooling medium such as water or oil used is much larger than that of ordinary air. Therefore, the liquid cooling plate 2 can very efficiently remove the ohmic heat generated by the winding assembly from the coil winding 8 during operation.

[0046] Among them, considering the complex operation modes of the motor, when the motor is in low-performance modes such as low load and low speed, the liquid cooling plate 2 can be disassembled to improve energy efficiency. However, when the motor is in high-performance modes such as high load, high precision, and high acceleration, the liquid cooling plate 2 can effectively solve the problem of thermal runaway, ensure the reliable operation and rapid disassembly of the motor. Moreover, the design of the liquid cooling plate 2 that can effectively solve the problem of thermal runaway and ensure the reliable operation of the motor and can be quickly disassembled further reduces the difficulty and cost of the use and assembly of the machine. In summary, the cooling system can prevent the heat accumulation of the motor during long-term operation and meet the requirements of the weight reduction and miniaturization of the motor. In addition, the heat dissipation structure is simple and easy to disassemble, with the advantages of energy saving and low cost.

[0047] Matters not targeted in the present invention are known technologies.

[0048] In the description of this specification, terms such as "one embodiment", "some embodiments", "exemplarily", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or embodiments are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials, or characteristics described can be combined in any suitable way in any one or more embodiments or examples. Furthermore, those skilled in the art can combine different embodiments or examples described in this specification and the features of different embodiments or examples as long as they do not conflict with each other.

[0049] The above embodiments are only for explaining the technical idea and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and do not limit the protection scope of the present invention. All equivalent changes or modifications made based on the essence of the present invention shall be included in the protection scope of the present invention.

Explanation of Reference Numerals

[0050] 1. Cover plate, 2. Liquid cooling plate, 3. Silicon steel plate for motor, 4. Thermally conductive silicone grease, 5. Bottom plate, 6. Rotor, 7. Stator, 8. Coil winding, 9. Iron core, 10. Fixing screw, 11. Heat dissipation fin, 12. Conversion joint, 13. Guide rail, 14. Magnetic steel, 15. Soft rubber pipe, 16. Water storage groove, 17. Return groove, 18. Liquid inlet, 19. Liquid outlet.

Claims

1. It includes a mover, the mover includes a silicon steel sheet for motor, a core is connected to the bottom of the silicon steel sheet for motor, a coil winding is wound around the core, a liquid cooling plate is installed on the top of the silicon steel sheet for motor, a thermally conductive interface material is provided between the contact surface of the silicon steel sheet for motor and the liquid cooling plate, heat dissipation fins are installed inside the liquid cooling plate, and a flow path through which a cooling medium flows is formed in the heat dissipation fins. A liquid inlet and a liquid outlet are provided inside the liquid cooling plate, and the liquid inlet and the liquid outlet communicate with the flow paths formed in the heat dissipation fins respectively. The cross-section of the heat dissipation fins is any one of concave-convex type, mountain type, corrugated type, porous shape, and zigzag shape. The flow paths through which the cooling medium flows form a plurality of unit flow paths arranged in parallel. The number of unit flow paths on the liquid inlet side is the same as the number of unit flow paths on the liquid outlet side, and the liquid inlet side and the liquid outlet side of the unit flow path communicate with the liquid inlet and the liquid outlet respectively. The unit flow paths are arranged on the same horizontal plane, and the unit flow paths are arranged as linear flow paths. A cooling system for a linear motor is characterized by this.

2. The cooling system for a linear motor according to claim 1, characterized in that the liquid cooling plate and the silicon steel sheet for motor are in surface contact.

3. A cover plate is installed at the upper end of the liquid cooling plate, a bottom plate is provided at the lower end of the liquid cooling plate, and the heat dissipation fins are installed between the cover plate and the bottom plate. A cooling system for a linear motor according to claim 1 is characterized by this.

4. The cooling system for a linear motor according to claim 3, characterized in that the liquid inlet and the liquid outlet are installed on the side surface of the cover plate respectively.

5. The cooling system for a linear motor according to claim 1, characterized in that the flow path through which the cooling medium flows is a U-shaped return flow path.

6. The cooling system for a linear motor according to claim 1, characterized in that the thermally conductive interface material is thermally conductive silicone grease, the cooling medium is water, and the liquid cooling plate is made of an aluminum alloy.

7. Furthermore, a stator that cooperates with the mover is also included. The mover is slidably installed within the stator. The stator includes magnetic steel and a guide rail, and the magnetic steel is laid along the length direction of the guide rail. The linear motor provided with the cooling system according to any one of claims 1 to 6, characterized in that.

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