CN219760835U

CN219760835U - Linear motor with cooling system

Info

Publication number: CN219760835U
Application number: CN202320869900.4U
Authority: CN
Inventors: 黄晓路; 张鸣; 朱煜; 刘相波; 黄河; 殷凤志
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2023-04-18
Filing date: 2023-04-18
Publication date: 2023-09-26
Anticipated expiration: 2033-04-18

Abstract

The utility model provides a linear motor with a cooling system, which is applied to the technical field of linear motors, wherein a motor stator or/and a motor rotor are provided with the cooling system; the motor stator comprises a stator base, a stator shell and a stator coil unit, wherein the stator base is connected in the stator shell and forms a cavity, the end part or all of the stator coil unit is immersed in the cavity, and a stator cooling medium flow passage communicated with the cavity is formed in the stator shell; the motor rotor comprises a rotor shell and a rotor coil unit, wherein the rotor shell is limited with a cavity suitable for cooling medium to flow, the rotor coil unit is fixedly connected in the cavity, and a rotor cooling medium runner communicated with the cavity is constructed in the rotor shell; the stator coil unit and the rotor coil unit are immersed in the cavity or the cavity, so that the cooling medium directly flows through the coil to take away heat, namely, the cooling medium is directly contacted with the coil, the heat transfer path is greatly shortened, and the heat dissipation performance is improved.

Description

Linear motor with cooling system

Technical Field

The utility model relates to the technical field of linear motors, in particular to a linear motor with a cooling system.

Background

The linear motor is widely applied to high-speed and high-precision occasions, and in order to enable the linear motor to stably output in the working process or further improve the output performance of the linear motor, coils of the linear motor are required to be cooled. Particularly when the linear motor is applied to a vacuum apparatus, since heat cannot be dissipated through air, the coil must be cooled.

In the prior art, natural cooling, air cooling and water cooling plate cooling are generally adopted, in a specific structure, a cooling medium is not in direct contact with a coil, heat generated by the coil needs to be conducted to a cooling assembly through heat, and then the cooling assembly takes away the heat. In this cooling mode, heat generated by the coil needs to transfer heat through various media such as a filling medium of the shell, the shell and the like, and a heat transfer path is long, so that heat dissipation capacity is limited.

Disclosure of Invention

The utility model provides a linear motor with a cooling system, which is used for solving the defects of long heat transfer path and limited heat dissipation capacity in the prior art.

The utility model provides a linear motor with a cooling system, which comprises a motor stator and a motor rotor, wherein the motor stator or/and the motor rotor are provided with the cooling system; the motor stator comprises a stator base, a stator shell and a stator coil unit, wherein the stator base is connected in the stator shell and forms a cavity, and the stator coil unit is fixedly connected to the stator base and enables the end part or the whole of the stator coil unit to be immersed in the cavity; the stator shell is internally provided with a stator cooling medium flow passage, and the cavity is communicated with the stator cooling medium flow passage;

the motor rotor comprises a rotor shell and a rotor coil unit, wherein the rotor shell is limited with a chamber suitable for cooling medium to flow, and the rotor coil unit is fixedly connected in the chamber; the rotor shell is internally provided with a rotor cooling medium flow passage which is communicated with the cavity.

According to the linear motor provided by the utility model, the stator coil unit or/and the rotor coil unit comprise a coil and a fixed frame, and the coil is embedded on the fixed frame.

According to the linear motor provided by the utility model, the fixed frame comprises a hollow bottom plate, a raised core frame suitable for supporting the coil is connected with one circle along the hollow edge of the bottom plate, and the two ends of the raised core frame are respectively connected with fixed fasteners, so that the coil is limited by the fixed fasteners.

According to the linear motor provided by the utility model, the coil comprises a wire, and the wire is wound into a preset coil shape in a laminated winding mode;

and a plurality of gaps with preset shapes are formed between the wire layers of any outer ring and the wire layers of the adjacent inner rings in the coil, and the gaps of the same wire layers can be arranged to form cooling channels with preset shapes.

According to the linear motor provided by the utility model, grooves are respectively formed in two sides of the bottom plate, and the grooves are arranged along the extending direction of the bottom plate.

According to the present utility model, there is provided a linear motor in which the coil has an end portion, and the gap is disposed at a corner position of the end portion.

According to the linear motor provided by the utility model, the coil is provided with the end parts, and the gaps are arranged between the wire layers of the end parts in a strip shape.

According to the linear motor provided by the utility model, through holes are arranged in the stator shell or/and the rotor shell, the stator cooling medium runner or/and the rotor cooling medium runner are communicated with the through holes, and the through holes are opposite to the gaps, so that cooling medium can fully flow through the cooling channels.

According to the linear motor provided by the utility model, the stator cooling medium flow passage is arranged in the stator shell at two ends of the stator base, and the stator cooling medium flow passage comprises a cooling medium input passage and a cooling medium output passage which are respectively communicated with the cavity.

According to the linear motor provided by the utility model, the rotor cooling medium flow passage comprises a cooling medium input port and a cooling medium output port which are respectively communicated with the cavity.

According to the above-described embodiments, the present utility model has at least the following advantageous effects.

According to the linear motor with the cooling system, the cooling system is arranged on the motor stator or/and the motor rotor, and particularly the stator coil unit and the rotor coil unit are immersed in the cooling medium in the cavity or the cavity, so that the cooling medium directly flows through the coil to take away heat, namely, the cooling medium is directly contacted with the coil, the heat transfer path is greatly shortened, and the heat dissipation performance is improved.

Drawings

In order to more clearly illustrate the utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a motor stator according to the present utility model;

FIG. 2 is a schematic diagram of a second embodiment of a stator of an electric motor according to the present utility model;

FIG. 3 is a schematic diagram of a motor rotor according to the present utility model;

FIG. 4 is a second schematic diagram of the motor mover according to the present utility model;

fig. 5 is a schematic structural view of a stator coil unit or a mover coil unit provided by the present utility model;

FIG. 6 is a schematic view of a structure of a fixing frame according to the present utility model;

fig. 7 is a schematic diagram of a coil structure provided by the present utility model.

Reference numerals:

1. a coil; 11. a void; 2. a fixed frame; 21. a fixing fastener; 22. a groove; 3. a stator housing; 31. a cooling medium input passage; 311. stator through holes; 32. a cooling medium output passage; 321. an output aperture; 33. a cavity; 4. a motor stator; 41. a tooth slot structure; 5. a motor rotor; 51. a cooling medium inlet; 511. a mover through hole; 512. a hole is formed; 52. a cooling medium outlet; 53. a mover housing; 54. a chamber.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the present utility model, unless explicitly specified and limited otherwise, the terms "connected," "connected," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral body; either directly, or indirectly, through intermediaries, may be internal to each other, or may be in a relationship between two elements, unless otherwise specifically defined. The above terms are understood in the specific meaning of the present utility model according to circumstances, for those of ordinary skill in the art.

In the following, a linear motor with a cooling system according to the present utility model will be described with reference to fig. 1 to 4, which comprises a motor stator 4 and a motor mover 5, wherein the cooling system may be built in the motor stator 4, the cooling system may be built in the motor mover 5, or the cooling system may be built on both the motor stator 4 and the motor mover 5. How to construct is chosen according to the actual design requirements.

As shown in fig. 1 and 2, the motor stator 4 includes a stator base, a stator housing 3, and a stator coil unit, wherein the stator base is connected to the stator housing 3 and forms a cavity 33 by connecting, and the stator coil unit is fixedly connected to the stator base such that an end portion or all of the stator coil unit is contained in the cavity 33; wherein, stator housing 3 is constructed with stator cooling medium runner, cavity 33 communicates with stator cooling medium runner.

The cooling medium enters the cavity 33 through the stator cooling medium flow channel and flows out of the cavity 33, and the end part or all of the stator coil unit is immersed in the cavity 33, so that heat is timely taken away in the flowing-in and flowing-out process of the cooling medium, the cooling medium is directly contacted with the stator coil unit, a heat transfer path is reduced, and the heat dissipation capacity is improved.

It will be appreciated that, as shown in fig. 1, if the space on the stator coil unit between the slot structures 41 of the motor stator 4 is filled, the cavities 33 are located at both ends of the connection of the motor stator 4, and the two side ends of the stator coil unit are immersed into the cavities 33 at both ends; if the space on the coil units between the slot structures 41 of the motor stator 4 is reserved, the cavity 33 contains the entire space where the motor stator 4 is connected to the stator housing 3 on both sides, and the stator coil units are all immersed into the cavity 33. The mode of immersing the stator coil into the cavity is selected according to actual requirements.

As shown in fig. 3 and 4, the motor mover 5 includes a mover housing 53 and a mover coil unit, the mover housing 53 defining a chamber 54 adapted for a flow of a cooling medium, the mover coil unit being fixedly connected within the chamber 54; wherein, rotor cooling medium flow passage is configured in rotor housing 53, and the cooling medium flow passage communicates with chamber 54.

The cooling medium enters the chamber 54 through the runner of the cooling medium of the rotor and flows out of the chamber 54, and the rotor coil is connected in the chamber 54, namely, the rotor coil is immersed in the cooling medium, so that heat generated by the rotor coil unit is timely taken away in the inflow and outflow processes of the cooling medium, the cooling medium is directly contacted with the rotor coil unit, a heat transfer path is reduced, and the heat dissipation capacity is improved. It is understood that the coil fixing structures of the mover coil unit and the stator coil unit may be separately provided or combined, that is, the mover coil unit and the stator coil unit may be simultaneously selected from the same similar coil fixing structures or different coil fixing structures. As shown in fig. 5 and 6, the stator coil unit and the stator coil unit have similar structures, and the stator coil unit only have differences in size and shape, and include a coil 1 and a fixed frame 2, wherein the coil 1 is embedded on the fixed frame 2, and the fixed frame 2 is embedded on the stator base and in the rotor housing 53. In a specific embodiment, a plurality of parallel tooth slot structures 41 are arranged on the stator base, and the tooth slot structures 41 are matched with the fixed frame 2, so that the fixed frame 2 is connected to the tooth slot structures 41 in an embedded mode, and connection of the stator coil units is achieved. When the mover coil unit is connected, the connection of the mover coil unit is achieved by being directly connected into the mover housing 53 through the fixing frame 2. The coil 1 is connected by means of the fixing frame 2, the fixing connection can be completed without filling resin or other filling media in the stator tooth slot structure 41 or the rotor shell 53, an insulating cooling medium can be poured into the space which originally needs to be filled with the fixing media, and the cooling medium directly exchanges heat with the coil 1, so that heat generated by the coil 1 is taken away. It will be understood, of course, that in order to further increase the stability of the coil 1, the space may be partially filled with a fixing medium for fixing, while the remaining space is filled with an insulating cooling medium for cooling.

And, make coil 1 in advance wind the completion with the help of the connection of fixed frame 2 and form fashioned coil unit, be convenient for the assembly of motor coil unit, avoided complex technology such as rule for motor manufacturing is simpler.

The fixing frame 2 comprises a hollow bottom plate, a convex core frame suitable for supporting the coil 1 is connected along the hollow edge of the bottom plate, and fixing fasteners 21 are respectively connected to two ends of the convex core frame, so that the coil 1 is limited by the fixing fasteners 21.

It will be appreciated that when manufacturing the stator coil 1 unit or the mover coil unit, the coil 1 is wound into a molded coil 1 structure according to a predetermined winding process, the molded coil 1 is first embedded into the protruding core frame, and then fixedly connected with the protruding core frame by the fixing fastener 21 to ensure the connection stability of the molded coil 1, and of course, when connecting the coil 1, glue, resin or the like may be filled to improve the connection strength.

In some embodiments, as shown in fig. 6, the base plate has grooves 22 on both sides thereof, respectively, the grooves 22 being disposed along the extending direction of the base plate. The grooves 22 can guide the liquid cooling medium to flow through the surface of the coil 1 so as to achieve sufficient contact between the cooling medium and the coil 1 and improve heat dissipation performance.

In a specific embodiment, the coil 1 comprises a wire wound in a laminate winding manner into a predetermined coil 1 shape; wherein, a plurality of gaps 11 with a preset shape are constructed between the wire layer of any outer ring and the wire layer of the adjacent inner ring in the coil 1, and the gaps 11 of the same wire layer can be arranged to form a cooling channel with a preset shape. Further, as shown in fig. 5, the coil 1 has a rectangular structure, the coil 1 of which has two ends, and the gap 11 is disposed at the corner position of the end of the coil 1. Further, as shown in fig. 7, the coil 1 has a rectangular structure with two ends, and the gaps 11 are arranged between the wire layers of the ends in a strip shape, so that the arrangement of the strip-shaped gaps 11 further increases the heat exchange area and improves the heat dissipation performance.

The arrangement of the gaps 11 on the coil 1 enables the cooling liquid to flow through the gaps 11 to take away a large amount of heat in the coil 1, so that the heat dissipation performance is further improved, the shape of the gaps 11 is not limited, and the shape of the gaps 11 is determined by a winding process. Specifically, for the production of the coil 1 having the gaps 11, the coil 1 having the gaps 11 may be produced by inserting a cushioning material between each wire layer or between the spaced wire layers while winding the wire layers, and then separating the cushioning material from the coil 1 to form the gaps 11, the shape of the gaps 11 being determined by the cushioning material.

Further, the wire of the wound coil 1 is not limited, and may take the form of a round wire enamel, a flat copper wire enamel, an aluminum foil wire, a copper foil wire, or the like.

As also shown in fig. 1, in some embodiments, stator cooling medium flow passages are disposed in the stator housing 3 at both ends of the stator base, and the stator cooling medium flow passages include cooling medium input passages 31 and cooling medium output passages 32 that are respectively communicated with the cavities 33.

In the above embodiment, the cooling medium is input into the stator housing 3 through the cooling medium input channel 31 and enters the cavity 33, the coil 1 is immersed in the cavity 33, so that the injected cooling medium is in direct contact with the coil 1, direct heat exchange is realized, and finally the cooling medium is output through the cooling medium output channel 32, so that the heat dissipation capacity is improved, and the allowable current is further improved, thereby improving the power density of the motor, and achieving the purpose of improving the output performance of the linear motor.

In a further embodiment, as shown in fig. 2, only part of the coil 1 is schematically depicted, the arrows indicating the medium flow direction. The stator through holes 311 communicated with the cavity 33 are formed in the cooling medium input channel 31, the stator through holes 311 are opposite to the cooling channels formed by the gaps 11, so that under the action of pressure, the cooling medium flows to the cooling channels formed by the coil gaps 11 through the stator through holes 311, the cooling channels are formed by a plurality of gaps 11, and belong to a part of the coil 1, the contact between the coil 1 and the cooling medium is increased through the cooling channels, and the cooling medium can fully flow through the coil surfaces in the gaps 11, as shown by arrow a in the figure. Due to the flowability of the medium, the cooling medium flows partly through the coil interspace 11 and partly through the surface of the coil 1, as indicated by arrow b. Finally, it is collected at the output hole 321 of the cooling medium output passage 32 and discharged from the cooling medium output passage 32 as indicated by an arrow c in the figure. A part of the cooling medium may be discharged from the opposite flow path by passing the cooling medium through the surface of the coil 1 through the grooves 22 by using the grooves 22 formed in the fixing frame 2. The stator through holes 311 allow the cooling medium to be sufficiently injected into the coil gap 11, enhancing the heat radiation capability.

As also shown in fig. 3, in some embodiments, the mover cooling medium flow path is disposed at both sides of the mover housing 53, and includes a cooling medium input port 51 and a cooling medium output port 52 respectively communicating with the chamber 54. The positions of the cooling medium inlet 51 and the cooling medium outlet 52 are not limited to be interchangeable and may be any position of the stator housing 3.

In the above embodiment, the cooling medium is input into the chamber 54 through the cooling medium input port 51, the coil 1 is immersed in the cooling medium in the chamber 54, so that the injected cooling medium is in direct contact with the coil 1 to realize direct heat exchange, and finally the cooling medium is discharged through the cooling medium output port 52, thereby improving the heat dissipation capability and further improving the allowable current, so as to improve the power density of the motor and achieve the purpose of improving the output performance of the linear motor.

In a further embodiment, as shown in fig. 4, three coils 1 and their fixing frames 2 are schematically shown in the mover housing 53, and in practical application, the coils 1 and their frames may be arranged in any number and any distance. A medium channel is arranged in the rotor shell 53, the medium channel is a processed runner or a pipeline, the medium channel is communicated with the cooling medium input port 51, a rotor through hole 511 communicated with the medium channel is also constructed in the rotor shell 53, and the rotor through hole 511 is arranged opposite to the cooling channel formed by the gap 11 on the coil 1. As indicated by the arrow in the figure, a part passes through the coil gap 11, as indicated by the arrow a in the figure, a part flows to the side of the coil 1, as indicated by the arrow b in the figure, and a part flows to the upper and lower surfaces, as indicated by the arrows c, d in the figure. And then through the opposite coil gap 11 and the side as indicated by arrows e and f, and finally the medium is collected in the outlet hole 512 and discharged through the cooling medium outlet 52.

Further, non-conductive, non-corrosive liquids such as fluorinated liquids, silicone oils, natural mineral oils, transformer oils, etc. may be employed for the cooling medium; non-conductive, non-corrosive gases such as air, nitrogen, helium, etc. may also be used.

It will be appreciated that in the above embodiment, the motor stator 4 and the motor rotor 5 form a closed system, and the whole motor is only connected with the outside through the cooling medium and the outgoing line of the coil 1, so that the motor can be applied to vacuum occasions.

From the above description of the embodiments, it will be clear to those skilled in the art that the embodiments, on the one hand, directly immerse the coil 1 in the cooling medium, cancel or reduce the conventional resin fixation, and fix the coil 1 using the fixing frame 2 having the flow channels. Not only ensures the fixing strength of the winding coil 1, but also leaves room for the cooling medium to flow. At this time, the outer surface of the coil 1 is fully immersed in the cooling medium, so that the heat transfer path of the resin medium is reduced, and the heat of the conductor directly exchanges heat with the cooling medium after passing through the insulating layer, thereby improving the heat dissipation capacity, and meanwhile, the outer surface of the coil 1 is fully utilized, and the side surface of the coil 1 can also exchange heat with the cooling medium with high efficiency; on the other hand, when the coil 1 is wound, a gap 11 is left at the end, increasing the contact area with the heat exchange medium. When strip-like voids 11 are employed, the increased heat transfer area may even exceed the overall surface area of the void-free coil in some embodiments.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. The utility model provides a linear electric motor with cooling system, includes motor stator and motor active cell, its characterized in that:

the motor stator comprises a stator base, a stator shell and a stator coil unit, wherein the stator base is connected in the stator shell and forms a cavity, and the stator coil unit is fixedly connected to the stator base and enables the end part or the whole of the stator coil unit to be immersed in the cavity; wherein, a stator cooling medium runner communicated with the cavity is constructed in the stator shell;

or/and, the motor rotor comprises a rotor shell and a rotor coil unit, wherein the rotor shell is limited with a cavity suitable for cooling medium to flow, and the rotor coil unit is fixedly connected in the cavity; wherein, rotor cooling medium runner that is constructed with in the rotor casing with the cavity intercommunication.

2. The linear motor according to claim 1, wherein the stator coil unit or/and the mover coil unit includes a coil and a fixed frame, the coil being embedded on the fixed frame.

3. The linear motor of claim 2, wherein the stationary frame comprises a hollow base plate, a raised core frame adapted to support the coil is attached along a hollow edge of the base plate, and stationary fasteners are attached to both ends of the raised core frame, respectively, such that the coil is defined by the stationary fasteners.

4. The linear motor of claim 2, wherein the coil includes a wire wound in a laminate-wound manner into a predetermined coil shape;

5. A linear motor according to claim 3, wherein the base plate has grooves on both sides thereof, respectively, the grooves being arranged along the extending direction of the base plate.

6. The linear motor of claim 4, wherein the coil has an end, the gap being disposed at a corner of the end.

7. The linear motor of claim 4, wherein the coil has ends and the gap is arranged in a strip between wire layers of the ends.

8. The linear motor according to claim 6 or 7, wherein through holes are formed in the stator housing or/and the mover housing, the stator cooling medium flow passage or/and the mover cooling medium flow passage are communicated with the through holes, and the through holes are opposite to the gaps so that cooling medium can sufficiently flow through the cooling channels.

9. The linear motor of claim 1, wherein the stator coolant flow passages are disposed in the stator housing at both ends of the stator base, the stator coolant flow passages including a coolant input passage and a coolant output passage in communication with the cavities, respectively.

10. The linear motor of claim 1, wherein the mover cooling medium flow passage includes a cooling medium input port and a cooling medium output port respectively communicating with the chambers.