Motor winding direct liquid cooling mechanism and motor

Abstract

The invention provides a motor winding direct liquid cooling mechanism and a motor, which are used for solving the problems that the traditional motor is large in loss and the winding is easy to overheat. The motor winding direct liquid cooling mechanism is provided with cooling pipelines, the cooling pipelines are annularly wrapped and assembled, the two side faces and the two end faces of each winding are wrapped with the cooling pipelines, the cooling pipelines form one or more cooling channels, and the cooling channels are provided with cooling medium inlets and outlets. In the direct liquid cooling mechanism for the motor winding, the cooling pipeline wraps the winding and is in contact with the winding, the heat transfer resistance is small, the cooling efficiency is high, and the thrust density of the motor can be improved. The cooling pipeline in the liquid cooling mechanism wraps the four surfaces, including the side surfaces and the end surfaces, of all the windings, and the problem of cooling dead angles caused by the fact that the ends of the windings cannot be completely wrapped in a traditional cooling structure is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric machines, and mainly relates to a direct liquid cooling mechanism for the winding of an electric machine and the electric machine. BACKGROUND

[0002] A linear motor is composed of a mover and a stator, and the mover directly performs reciprocating linear motion, has the advantages of simple structure and high transmission efficiency, and thus has application scenarios in the fields of machine tools, semiconductors, automated production lines, and logistics transportation. However, with the expansion and development of applications, high thrust density is urgently needed for linear motors in high-end application fields such as lithography machines, machine tools, and biological instrument equipment to meet the strict volume and mass requirements in applications.

[0003] As a direct-drive motor, in order to achieve high thrust density, the electric load design of the linear motor usually needs to be improved, which makes the winding loss of such a linear motor account for a high proportion (usually more than 80% of the total loss). The loss accumulates on the winding, which easily leads to rapid temperature rise, especially the winding located at the end, which has slow heat dissipation and is prone to become a hot spot. Therefore, efficient motor cooling is necessary.

[0004] Traditional linear motor cooling usually sets a liquid cooling channel in the shell or the stator yoke. In this way, the cooling pipeline is far away from the winding, the cooling effect is poor, and the winding located at the end cannot be cooled, which becomes a cooling dead angle, thereby limiting the improvement of the thrust density of the linear motor and becoming a potential risk point for the overheating and burning of the motor winding. Other types of motors such as arc motors also have the problem of insufficient cooling of the winding located at the end. Therefore, to promote the realization of higher output thrust and thrust density of the motor, more reasonable designs are needed in the cooling of the motor. SUMMARY

[0005] The application is to solve the problem of large loss and easy overheating of the winding of a traditional motor, and proposes a direct liquid cooling mechanism for the winding of an electric machine and the electric machine.

[0006] The specific technical solutions of the application are as follows:

[0007] A direct liquid cooling mechanism for the winding of an electric machine, the electric machine is provided with a winding, the liquid cooling mechanism is provided with a cooling pipeline, the cooling pipeline annularly surrounds the winding, the two side surfaces and the two end surfaces of each winding are wrapped with the cooling pipeline, the cooling pipeline forms one or more cooling channels, and the cooling channel is provided with a cooling medium inlet and outlet.

[0008] The application is further designed that the cooling pipeline comprises at least upper and lower cooling pipelines arranged in up-down positions, and the cooling pipelines arranged at two sides and one end of each winding are connected in sequence to form an upper cooling channel; the cooling pipelines arranged at two sides and one end opposite to the one end of each winding are connected in sequence to form a lower cooling channel, thereby forming a liquid cooling mechanism surrounding the winding by the upper and lower cooling channels.

[0009] The application is further designed that the upper and lower cooling channels are respectively composed of one or more cooling branches, the width of each cooling branch is the same or different; the number of cooling channels or the design shape of the channels is the same or different, and each cooling channel is connected in series, parallel or mixed series-parallel.

[0010] The application is further designed that the liquid cooling mechanism is provided with a grid structure connected by a plurality of unit cells, and the arrangement of the grid structure is the same as that of the cooling pipeline, each unit cell surrounds a winding, and the grid structure is provided with the cooling pipeline and forms a grid structure with cooling channels.

[0011] The application is further designed that the grid structure with cooling channels is made by additive manufacturing technology.

[0012] The application is further designed that the grid structure is composed of an upper cooling structure and a lower cooling structure, the unit cells are divided into end plates at two ends and side plates at two sides, two adjacent unit cells share one adjacent side plate, and each side plate is divided into an upper side plate and a lower side plate; for a linear motor, the side plates outside the first and last unit cells are integral plates.

[0013] In adjacent unit cells, the left side plate, rear end plate and right upper side plate of unit cell one are connected in sequence with the front end plate and right upper side plate of unit cell two,..., to form the upper cooling structure, and at least one upper cooling channel is arranged in the upper cooling structure;

[0014] In adjacent unit cells, the front end plate and right lower side plate of unit cell one are connected in sequence with the rear end plate and right lower side plate of unit cell two,..., to form the lower cooling structure, and at least one lower cooling channel is arranged in the lower cooling structure. The pipeline of the connection part of the side plate and the end plate is also connected.

[0015] The application is further designed that if the front end plate of the unit cell is in a convex structure, the rear end plate is in an inverted convex structure, and the convex structure and the inverted convex structure are matched between adjacent unit cells, thereby forming the matched connection between the end plates of adjacent unit cells, and if the end plate in the convex structure is connected in the lower cooling structure / upper cooling structure, the end plate in the inverted convex structure is connected in the upper cooling structure / lower cooling structure.

[0016] Further design is that the lattice plate corresponding to the outer surface of the winding end is provided with a heat dissipation fin, so that the heat dissipation is enhanced.

[0017] Further design is that the motor is a core motor or a coreless motor, and the winding is arranged in a slot of the core of the core motor or a virtual slot of the coreless motor.

[0018] A motor comprising the direct liquid cooling mechanism for motor winding, and the motor is a linear motor, an arc motor or a disc motor.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] In the direct liquid cooling mechanism for motor winding, the cooling pipeline wraps the winding and contacts the winding, the heat transfer thermal resistance is small, the cooling efficiency is high, and the thrust density of the motor is improved.

[0021] In the direct liquid cooling mechanism for motor winding, the cooling pipeline wraps all four sides of the winding including the side surface and the end surface, and the cooling dead angle problem caused by the fact that the winding end cannot be completely wrapped in the traditional cooling structure is overcome.

[0022] The cooling pipeline is made by additive manufacturing technology, and the liquid cooling mechanism can match the winding structure, so that the problem of large occupied end volume caused by the large radius of the arc segment of the traditional cooling copper pipe is overcome, and the compact motor structure and small volume design are realized.

[0023] The lattice plate structure with a cooling channel is formed by additive manufacturing and is formed in a split or integrated manner, and based on the additive manufacturing technology, different cooling branch numbers and cooling pipeline shape structure designs can be easily realized, and the pipeline design is optimized.

[0024] In the direct liquid cooling mechanism for motor winding, the lattice plate structure with a cooling channel is formed by printing into an upper cooling structure and a lower cooling structure, and then the upper cooling structure and the lower cooling structure are spliced to form a whole, so that the molding is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the primary structure of the linear motor with the direct liquid cooling mechanism for winding in the embodiment;

[0026] Figure 2 It is a schematic diagram of the direct liquid cooling mechanism for winding of the linear motor in the embodiment;

[0027] Figure 3 It is a schematic diagram of the structure of the series connection type of the upper and lower cooling channels in the direct liquid cooling mechanism for winding of the linear motor in the embodiment;

[0028] Figure 4 Structure diagram of the end plate in the embodiment;

[0029] Figure 5 Structure diagram of the heat dissipation fin on the surface of the end plate in the embodiment;

[0030] Figure 6 Structure diagram of the parallel type of the upper and lower cooling channels in the direct liquid cooling mechanism of the linear motor winding in the embodiment;

[0031] Figure 7 Structure diagram of the cold plate with cooling channels integrally formed by additive manufacturing;

[0032] Figure 8 The integrally formed direct liquid cooling mechanism of the linear motor winding in the embodiment;

[0033] Figure 9 Structure diagram of the direct liquid cooling mechanism of the linear motor winding with four-layer slot cooling pipes;

[0034] Figure 10 Structure diagram of the direct liquid cooling mechanism of the coreless motor;

[0035] Figures 1-8 In the embodiment, 1 is a direct liquid cooling mechanism; 2 is a winding; 3 is a core; 4 is an upper cooling structure; 5 is a lower cooling structure; 6 is a cooling flow passage in series connection of the upper and lower layers; 7 is an upper cooling channel; 8 is a lower cooling channel; 41 is an upper cooling channel inlet; 42 is a left side plate; 43 is a rear end plate; 44 is a right upper side plate; 45 is an upper cooling channel outlet; 51 is a lower cooling channel inlet; 52 is a right side plate; 53 is a front end plate; 54 is a right lower side plate; 55 is a front end plate; 56 is a heat dissipation fin; 431 is a first branch; 432 is a second branch; 433 is a third branch; 434 is a fourth branch. DETAILED DESCRIPTION

[0036] The application will be further described below in combination with the drawings and embodiments:

[0037] Embodiment one:

[0038] The embodiment provides a direct liquid cooling mechanism of a motor winding, the motor comprising a stator core and a winding, the winding being arranged in a slot of the stator core, the liquid cooling mechanism comprising a cooling pipe arranged in the slot of the core, the cooling pipe annularly surrounding each winding, two side surfaces and two end surfaces of each winding being wrapped with the cooling pipe, the cooling pipe forming one or more cooling channels, the cooling channel being provided with a cooling medium inlet and outlet. The cooling pipe wraps the four surfaces of the winding, and the cooling has no dead angle problem. The cooling pipe is a channel capable of flowing the cooling medium, and the channel can adopt a pipe structure or a related structure with an opening.

[0039] Example 2:

[0040] A further optional design in this example is that the cooling piping includes at least upper and lower cooling pipes arranged vertically. Cooling pipes located on both sides and one end face of each winding are sequentially connected to form an upper cooling channel; cooling pipes located on both sides and the end face opposite to one end face of each winding are sequentially connected to form a lower cooling channel. This creates a liquid cooling mechanism where the upper and lower cooling channels surround each winding on all four sides, also known as a cross-encirclement of the windings. Using upper and lower arranged cooling pipes allows for a cross-wrapping effect, covering all four sides of each winding, facilitating sufficient heat dissipation and improving cooling efficiency.

[0041] The upper and lower cooling channels are each composed of one or more cooling branches, and the width of each cooling branch may be the same or different; the number of cooling channels or the design shape of the channels may be the same or different, and the cooling channels may be connected in series, in parallel or in a mixed series-parallel connection.

[0042] In this invention, the winding can be made of multiple coils, and the winding can be a stator winding and / or a rotor (mover) winding.

[0043] Example 3:

[0044] like Figure 1 , Figure 2 As shown, a further optional design in this example is that the motor includes a stator core 3 and windings 2. The liquid cooling mechanism 1 has a grid structure composed of several connected cells, arranged in the same way as the cooling pipes. The cells are arranged in slots within the core, and each cell surrounds a winding. The grid structure contains cooling pipes and forms a grid structure with cooling channels. The grid structure with cooling channels can be manufactured using additive manufacturing technology. The grid structure is designed as a split structure, consisting of an upper cooling structure 4 and a lower cooling structure 5 that are joined together and sealed to form a single unit, as shown in the figure. Figure 7 As shown.

[0045] like Figure 3 As shown, the grid structure with cooling channels is composed of an upper cooling structure and a lower cooling structure. Each cell includes end plates at both ends and side plates on both sides. Adjacent cells share an adjacent side plate. Each side plate is divided into an upper side plate and a lower side plate. For linear motors, the outer side plates of the first and last cells are whole plates.

[0046] The left side panel, rear panel, and upper right side panel of the first cell in adjacent cells are connected to the front panel, upper right side panel, ... in sequence to form an upper cooling structure. The upper cooling structure has at least one upper cooling channel 7.

[0047] The front panel and lower right side panel of cell one, and the rear panel and lower right side panel of cell two, ... in adjacent cells are connected in sequence to form a lower cooling structure. The lower cooling structure contains at least one lower cooling channel 8. The pipes at the connection points of the side panels and end panels are also interconnected.

[0048] Figure 2 , Figure 6 In the primary core 3, the upper cooling channel inlet 41 and the lower cooling channel inlet 51 are located in the two longitudinal end slots, respectively. The upper cooling channel outlet 45 and the lower cooling channel inlet 51 overlap to form a series cooling passage 6, in which the upper cooling channel 7 and the lower cooling channel 8 are connected in series. Within the series cooling passage 6, coolant flows in from the upper cooling channel inlet 41, passes through the cooling pipes in the left side plate 42 of the first cell, the cooling pipes in the rear end plate, and the cooling pipes in the upper right side plate 44, reaches the upper cooling pipe outlet in the front end plate 45 of the sixth cell, then enters the lower cooling pipe inlet 51 in the right side plate 52 of the sixth cell, passes through the lower cooling pipes in the front end plate 53 and the lower right side plate 54 of the third cell, and finally flows out through the lower cooling outlet 55 of the first cell. The rear end plate 43 in the figure is the rear end plate of the third cell.

[0049] In this invention, the cooling pipes are directly arranged in the slots of the iron core, which can directly contact the windings. The heat transfer path from the heat source to the coolant is short and the thermal resistance is small. Furthermore, the end of any winding is surrounded by the cooling pipes, which can simultaneously achieve efficient cooling of both the slotted part and the end of the winding. This overcomes the problems of poor cooling effect and overheating dead zones at the winding ends caused by traditional cooling methods.

[0050] Example 4:

[0051] Further optional designs in this example include, for example Figure 2 As shown, the front end plate 53 of the cell has a convex structure, and the rear end plate 43 of the cell has an inverted convex structure, thus forming a mating connection between the end plates of adjacent cells. The end plate with the convex structure is connected to the lower cooling structure, and the end plate with the inverted convex structure is connected to the upper cooling structure.

[0052] like Figure 2 If the front panel 53 of the third cell has a convex structure, then the rear panel 43 has an inverted convex structure. Adjacent cells use a combination of convex and inverted convex structures to form a connection between the end panels of adjacent cells. If the convex front panel 53 is connected to the lower / upper cooling structure, then the inverted convex rear panel 43 is connected to the upper / lower cooling structure. The width of the narrow part of the convex structure is less than the width of the cell end panel, and the width of the wide part of the convex structure is the width of the cell end panel.

[0053] Example 5:

[0054] Further optional designs in this example include, for example Figure 4 As shown, to optimize fluid flow and heat transfer, the number and width of cooling branches at each end can be determined based on the temperature field distribution near the winding ends, thereby achieving optimal cooling of the end windings. Specifically, the design includes a first branch 431, a second branch 432, a third branch 433, and a fourth branch 434 on the end plate.

[0055] like Figure 5 As shown, the outer surface of the corresponding winding end of the grid structure is provided with heat dissipation fins. Specifically, heat dissipation fins 56 can be designed on the outer surface of the end plate 43 and the outer surface of the end plate 53 to increase the heat dissipation area and enhance the heat dissipation effect.

[0056] Example 6:

[0057] like Figure 8 As shown, the direct liquid cooling mechanism for the motor windings in this example is integrally formed using additive manufacturing, creating a cold plate structure with cooling channels. The side plates and end plates of the grid cell are integrally connected, and the internal structure includes upper and lower cooling channels. These channels can be single or multiple, and can be connected in parallel, series, or a combination of series and parallel connections. This example utilizes integral additive manufacturing to achieve a compact structure and optimized performance of the liquid cooling mechanism.

[0058] Example 7:

[0059] This example designs a motor that includes the above-mentioned direct liquid cooling mechanism for motor windings. The motor can be a linear motor, an arc motor, or a disc motor.

[0060] Example 8:

[0061] A further design in this example is, as Figure 9 As shown, the direct liquid cooling mechanism for the motor windings includes four layers of in-slot cooling pipes. The structure is composed of an upper cooling structure and a lower cooling structure. The upper cooling structure has two upper cooling channels, and the lower cooling structure has two lower cooling channels. The channels are connected in parallel, in series, or in a mixed series-parallel connection.

[0062] Example 9:

[0063] like Figure 10 As shown, the motor in this example is a coreless motor. The windings are set in the virtual slots of the coreless motor. The motor winding direct liquid cooling mechanism surrounds each coreless winding and is also set in the virtual slots of the coreless motor.

Claims

1. A direct liquid cooling mechanism for motor windings, wherein the motor is provided with windings, characterized in that: The liquid cooling mechanism is equipped with cooling pipes that wrap around the winding in a ring. Each winding has cooling pipes covering its two sides and two end faces. The cooling pipes form one or more cooling channels, and the cooling channels have inlets and outlets for cooling media.

2. The direct liquid cooling mechanism for motor windings according to claim 1, characterized in that: The cooling pipeline includes at least an upper cooling pipeline and a lower cooling pipeline arranged vertically. The cooling pipelines on both sides and one end face of each winding are connected in sequence to form an upper cooling channel; the cooling pipelines on both sides and the end face opposite to the one end face of each winding are connected in sequence to form a lower cooling channel, thereby forming a liquid cooling mechanism surrounded by the upper and lower cooling channels on all four sides.

3. The direct liquid cooling mechanism for motor windings according to claim 2, characterized in that: The upper and lower cooling channels are each composed of one or more cooling branches, and the width of each cooling branch may be the same or different; the number of cooling channels or the design shape of the channels may be the same or different, and the cooling channels may be connected in series, in parallel or in a mixed series-parallel connection.

4. The direct liquid cooling mechanism for motor windings according to claim 3, characterized in that: The liquid cooling mechanism has a grid structure composed of several connected cells, which is arranged in the same way as the cooling pipes. Each cell surrounds a winding, and the cooling pipes are arranged inside the grid structure to form a grid structure with cooling channels.

5. The direct liquid cooling mechanism for motor windings according to claim 4, characterized in that: The grating structure with cooling channels is manufactured using additive manufacturing technology.

6. The direct liquid cooling mechanism for motor windings according to claim 5, characterized in that: The grid structure is composed of an upper cooling structure and a lower cooling structure. Each cell is divided into end plates at both ends and side plates on both sides. Adjacent cells share an adjacent side plate. Each side plate is divided into an upper side plate and a lower side plate. In adjacent cells, the left side panel, rear end panel, and upper right side panel of cell one are connected to the front end panel, upper right side panel, ... of cell two in sequence to form the upper cooling structure. The upper cooling structure has at least one upper cooling channel. The front panel and lower right side panel of cell one and the rear panel and lower right side panel of cell two, ... in adjacent cells are connected in sequence to form the lower cooling structure, and the lower cooling structure has at least one lower cooling channel.

7. The direct liquid cooling mechanism for motor windings according to claim 6, characterized in that: If the front panel of a cell has a convex structure, then the rear panel has an inverted convex structure. Adjacent cells are connected by a combination of convex and inverted convex structures, thus forming a connection between the end panels of adjacent cells. If the end panel with a convex structure is connected to the lower cooling structure / upper cooling structure, then the end panel with an inverted convex structure is connected to the upper cooling structure / lower cooling structure.

8. The direct liquid cooling mechanism for motor windings according to claim 6, characterized in that: The outer surface of the grid plate corresponding to the winding end is provided with heat dissipation fins.

9. The direct liquid cooling mechanism for motor windings according to claim 6, characterized in that: The motor can be a cored motor or a coreless motor, with the windings arranged in the slots of the core in a cored motor or in the dummy slots in a coreless motor.

10. An electric motor, characterized in that, The invention includes the direct liquid cooling mechanism for motor windings as described in any one of claims 1-9, wherein the motor is a linear motor, an arc motor, or a disc motor.

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