Cooling loop structure for rotor magnetic steel

Abstract

The invention relates to a cooling loop structure for rotor magnetic steel. The cooling loop structure comprises a rotor and a rotor pressing plate, the rotor comprises a rotor core and a plurality of magnetic steels, a plurality of magnetic steel groove groups are formed on the rotor core, each magnetic steel groove group is provided with at least two layers of magnetic steel grooves, the magnetic steels are installed in the magnetic steel grooves in a one-to-one correspondence manner, and cooling oil channels are formed at the two ends, corresponding to the magnetic steels, of the magnetic steel grooves; the rotor pressing plates are annular and arranged at the two ends of the rotor, a plurality of tree-shaped oil ducts are formed in the plate faces of the sides, close to the rotor iron core, of the rotor pressing plates, each tree-shaped oil duct comprises a main duct and multiple layers of branch oil ducts located on the two sides of the main duct, the branch oil ducts correspond to the magnetic steel grooves in a one-to-one mode, and one end of each main duct extends to the middle of the annular shape to form an oil inlet. The cooling oil duct and the tree-shaped oil duct are matched to form a cooling loop; the tree-shaped oil ducts are arranged on the rotor pressing plate, so that cooling loops are formed between the branch oil ducts at the two ends and the magnetic steel grooves, and the magnetic steel is fully cooled through the cooling loops.

Description

Technical Field

[0001] The invention relates to the technical field of motor rotor cooling structure design, and in particular to a cooling circuit structure for rotor magnetic steel. Background Art

[0002] With the rapid development of the new energy vehicle industry at home and abroad, the requirements for the size and weight of motors, especially new energy vehicle drive motors, are becoming increasingly stringent, which is reflected in the increasingly high power density requirements in technical indicators. Motor high-speed is the main way to improve motor power density, so the motor speed is getting higher and higher.

[0003] One negative effect of the increase in motor speed is the increase in motor loss and heat, especially the loss and heat of the rotor. Most of the new energy drive motors are permanent magnet synchronous motors. The abnormal temperature rise caused by the high rotor heat has a great negative effect on the performance of the rotor magnets. Therefore, rotor cooling, especially magnet cooling, has become increasingly important.

[0004] Currently, rotor cooling mainly relies on oiling the hollow shaft, oiling the rotor pressure plate, oiling the rotor core deweighting holes, etc. There is no good solution for how to achieve adequate cooling of the rotor magnetic steel, especially double-layer, triple-layer or even multi-layer magnetic steel. Summary of the invention

[0005] Based on the above description, the present invention provides a cooling circuit structure for rotor magnets to solve the technical problem of sufficient cooling of rotor magnets in the prior art.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: A cooling circuit structure for rotor magnetic steel, comprising a rotor and a rotor pressure plate; The rotor comprises a rotor core and a plurality of magnetic steels, wherein a plurality of magnetic steel slot groups are formed on the rotor core, each magnetic steel slot group having at least two layers of magnetic steel slots, the magnetic steels are installed in the magnetic steel slots one by one, and each layer of the magnetic steel slots is formed with cooling oil channels at both ends of the magnetic steels; The rotor pressure plate is arranged at both ends of the rotor, and a plurality of tree-shaped oil channels are formed on a plate surface of the rotor pressure plate on one side close to the rotor core. Each of the tree-shaped oil channels includes a main channel and multiple layers of branch oil channels located on both sides of the main channel. The branch oil channels correspond one-to-one to the magnetic steel grooves. One end of the main channel extends to the middle of the ring to form an oil inlet. The cooling oil channels of the at least two layers of magnetic steel grooves and the tree-shaped oil channels cooperate to form a cooling circuit.

[0007] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: The cooling circuit structure provided in the present application is achieved by arranging a tree-shaped oil channel on the rotor pressure plate, wherein at least two layers of magnetic steel grooves are arranged corresponding to the branch oil channels, so that a cooling circuit is formed between the branch oil channels and the magnetic steel grooves at both ends. When the cooling oil enters from the oil inlet of the main channel, the cooling oil and the magnetic steel grooves can be fully contacted through the cooling circuit, thereby achieving sufficient cooling of the magnetic steel, thereby effectively reducing the loss and heat of the rotor.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, one end of the branch oil channel is connected to the main channel, and the other end of the branch oil channel extends to the outer edge of the rotor pressure plate to form an oil throwing outlet, and the branch oil channel is blocked at a predetermined position according to the number of layers of the magnetic steel groove.

[0010] Furthermore, the rotor pressure plate includes a front end plate located at the front end of the rotor and a rear end plate located at the rear end of the rotor.

[0011] As a technical solution of the present application, the tree-shaped oil passage includes two layers of branch oil passages, and the two layers of branch oil passages include an inner layer branch oil passage and an outer layer branch oil passage. Optionally, the connection between the inner branch oil channel on the front end plate and the trunk channel is blocked, and the oil throwing outlet of the outer branch oil channel on the front end plate is blocked; The main channel on the rear end plate connected to the inner layer branch oil channel is blocked, and the oil throwing outlets of the inner layer branch oil channel and the outer layer branch oil channel on the rear end plate are both blocked.

[0012] Optionally, the main channel between the inner layer branch oil channel and the outer layer branch oil channel on the front end plate is blocked, and the oil throwing outlet of the inner layer branch oil channel on the front end plate is blocked; The oil inlet of the main channel on the rear end plate is blocked, and the oil throwing outlets of the inner layer branch oil channel and the outer layer branch oil channel on the rear end plate are both blocked.

[0013] As another technical solution of the present application, the tree-shaped oil passage includes three layers of branch oil passages, and the three layers of branch oil passages include an inner layer branch oil passage, a middle layer branch oil passage, and an outer layer branch oil passage; On the front end plate, there are two groups of three-layer branch oil passages. In the first group, the connection between the inner branch oil passage, the middle branch oil passage and the main passage is blocked, the oil-slinging outlets of the inner branch oil passage, the middle branch oil passage and the outer branch oil passage are all blocked, and the inner branch oil passage and the middle branch oil passage are connected at one side close to the main passage; in the second group, the oil-slinging outlets of the middle branch oil passage and the outer branch oil passage are all blocked, the connection between the inner branch oil passage and the main passage is blocked, the middle branch oil passage and the outer branch oil passage are connected through the main passage, and the oil inlet of the main passage is blocked; The rear end plate and the front end plate have the same structure, and the first group of three-layer branch oil passages on the rear end plate and the second group of three-layer branch oil passages on the front end plate are arranged correspondingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the overall structure of a cooling circuit structure for rotor magnetic steel provided by the present invention; Figure 2 It is a schematic diagram of the structure of the rotor pressure plate in Embodiment 1 and Embodiment 2 of the present invention; Figure 3 A diagram showing the position correspondence between the rotor pressure plate and the magnetic steel slots in Embodiment 1 and Embodiment 2 of the present invention; Figure 4 This is a flow diagram of the cooling oil in Example 1 of the present application; Figure 5 This is a flow diagram of the cooling oil in the second embodiment of the present application; Figure 6 This is the flow diagram of the cooling oil in Example 3 of the present application. DETAILED DESCRIPTION

[0015] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0017] It will be appreciated that spatial relationship terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as "on" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90° or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0018] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0019] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0020] Embodiment 1 like Figure 1 As shown, an embodiment of the present application provides a cooling circuit structure for rotor magnetic steel, which includes a rotor 10 and a rotor pressure plate 20.

[0021] The rotor 10 includes a rotor core 11 and a plurality of magnetic steels 12, wherein a plurality of magnetic steel slot groups are formed on the rotor core 11, each magnetic steel slot group has at least two layers of magnetic steel slots 11a, and the magnetic steels 12 are installed one by one in the magnetic steel slots 11a, and cooling oil channels 11b are formed at both ends of the magnetic steel slots 11a corresponding to the magnetic steel 12.

[0022] The rotor pressure plate 20 is annular and is disposed at both ends of the rotor 10 . Specifically, the rotor pressure plate 20 includes a front end plate 21 located at the front end of the rotor 10 and a rear end plate 22 located at the rear end of the rotor 10 .

[0023] Among them, a plurality of tree-shaped oil channels 210 are formed on a plate surface on one side of the rotor pressure plate 20 close to the rotor core 11, each of the tree-shaped oil channels 210 includes a main channel 21a, 22a and multiple layers of branch oil channels located on both sides of the main channel 21a, 22a, the branch oil channels correspond one-to-one to the magnetic steel groove 11a, one end of the main channel 21a, 22a extends to the middle of the ring to form an oil inlet, and the cooling oil channel 11b and the tree-shaped oil channel 210 cooperate to form a cooling circuit.

[0024] Among them, one end of the branch oil channel 212 is connected to the main channel 211, and the other end of the branch oil channel 212 extends to the outer edge of the rotor pressure plate 20 to form an oil throwing outlet. The branch oil channel 212 blocks a predetermined position according to the number of layers of the magnetic steel groove 11a, so that the oil cooling flow route constitutes a cooling circulation loop flowing along a predetermined direction.

[0025] Specifically, as a preferred embodiment of the present invention, two layers of magnetic steel slots 11a are provided on the rotor core, wherein, in order to ensure uniform magnetic length formed by the magnetic steel, the magnetic steel slots 11a are distributed in pairs on the rotor core, and each pair of magnetic steel slots 11a is symmetrical with respect to a straight line axis of a specific radius of the rotor core.

[0026] Correspondingly, the tree-shaped oil passage 210 includes two layers of branch oil passages, and the two layers of branch oil passages include inner layer branch oil passages 212a, 222a and outer layer branch oil passages 212b, 222b.

[0027] In this embodiment, the connection between the inner branch oil passage 212a on the front end plate 21 and the trunk passage 211 is blocked, and the oil throwing outlet of the outer branch oil passage 212b on the front end plate 21 is blocked; The main channel 211 on the rear end plate 22 connected to the inner branch oil channel 222a is blocked, and the oil throwing outlets of the inner branch oil channel 222a and the outer branch oil channel 222b on the rear end plate 22 are blocked.

[0028] The above-mentioned circuit structure design is adopted, and the black thick line part in the figure indicates the blockage. The cooling oil enters the main channel 211 from the oil inlet at the front end plate 21. Since the connection between the inner branch oil channel 212a on the front end plate 21 and the main channel 211 is blocked, the cooling oil can only reach the outer branch oil channel 222b. Since the oil outlet of the outer branch oil channel 222a is blocked, the cooling oil flows from the outer magnetic steel slot 11a at the front end into the rotor core inside the outer branch oil channel 222b. The horizontal long arrow in the figure indicates that the cooling oil flows from front to back from left to right, and from right to left indicates that the cooling oil flows from back to front. The cooling oil moves and then flows out from the outer magnetic steel groove at the rear end. Since the oil-throwing outlets of the inner branch oil channel 222a and the outer branch oil channel 222b on the rear end plate 22 are blocked, the cooling oil can only flow to the main channel 211, and then flow into the inner branch oil channel 222a, and then flow into the rotor core from the inner magnetic steel groove 11a at the rear end, and finally flow out from the inner branch oil channel 212a on the front end plate 21 and be thrown out from the oil-throwing outlet, thereby realizing the two-way flow of the cooling oil inside the rotor 10 and cooling the double-layer magnetic steel of the rotor.

[0029] Embodiment 2 The technical solutions of this embodiment and the embodiment are basically the same, except that the blocking positions on the tree-shaped oil passages are different, thereby changing the flow path of the cooling oil.

[0030] In this embodiment, the main channel 211 between the inner branch oil channel 212a and the outer branch oil channel 222a on the front end plate 21 is blocked, and the oil throwing outlet of the inner branch oil channel 212a on the front end plate 21 is blocked; The oil inlet of the main channel 211 on the rear end plate 22 is blocked, and the oil throwing outlets of the inner layer branch oil channel 222a and the outer layer branch oil channel 222b on the rear end plate 22 are blocked.

[0031] The above-mentioned circuit structure design is adopted, and the black thick line part in the figure indicates the blockage. The cooling oil enters the main channel 211 from the oil inlet at the front end plate 21. Since the main channel 211 between the inner layer branch oil channel 212a and the outer layer branch oil channel 222a on the front end plate 21 is blocked, the cooling oil can only reach the inner layer branch oil channel 212a. Since the oil outlet of the inner layer branch oil channel 212a on the front end plate 21 is blocked, the cooling oil flows into the rotor core from the inner layer branch oil channel 212a to the inner layer magnetic steel slot 11a at the front end. The horizontal long arrow in the figure indicates that the cooling oil flows from front to back from left to right, and from right to left indicates that the cooling oil flows from back to front, and then flows from the inner layer magnetic steel slot 11a at the rear end. Since the oil inlet of the main channel 211 on the rear end plate 22 is blocked, the cooling oil can only flow upward into the outer branch oil channel 222b of the rear end plate. Since the oil throwing outlets of the inner branch oil channel 222a and the outer branch oil channel 222b on the rear end plate 22 are blocked, the cooling oil flows into the outer magnetic steel groove located at the rear end in the outer branch oil channel 222b, then flows out from the outer magnetic steel groove located at the rear end, and finally is thrown out from the oil throwing outlet of the outer branch oil channel 212b of the front end plate, thereby realizing the two-way flow of cooling oil inside the rotor 10 and cooling the double-layer magnetic steel of the rotor.

[0032] In the first embodiment, the cooling oil first cools the outer magnetic steel and then cools the inner magnetic steel. In the present embodiment, the cooling oil first cools the inner magnetic steel and then cools the outer magnetic steel.

[0033] Embodiment 3 The difference between this embodiment and the above two embodiments is that the tree-shaped oil channel includes three layers of branch oil channels, and the three layers of branch oil channels include inner branch oil channels 212a, 212b, middle branch oil channels 212c, 212d and outer branch oil channels 212e, 212f. Correspondingly, the magnetic steel groove also has three layers and corresponds one by one to all the branch oil channels.

[0034] The front end plate 21 is provided with two groups of three-layer branch oil passages.

[0035] In the first group, the connections between the inner branch oil passage 212a, the middle branch oil passage 212c and the trunk passage 21 are blocked, the oil throwing outlets of the inner branch oil passage 212a, the middle branch oil passage 212c and the outer branch oil passage 212e are all blocked, and the inner branch oil passage 212a and the middle branch oil passage 212c are connected at one side close to the trunk passage 21; In the second group, the oil-slinging outlets of the middle branch oil passage 212d and the outer branch oil passage 212f are blocked, the connection between the inner branch oil passage 212b and the trunk passage 211 is blocked, the middle branch oil passage 212d and the outer branch oil passage 212f are connected through the trunk passage 211, and the oil inlet of the trunk passage 21 is blocked; The rear end plate and the front end plate have the same structure, and the first group of three-layer branch oil passages on the rear end plate and the second group of three-layer branch oil passages on the front end plate are arranged correspondingly.

[0036] After adopting the above-mentioned circuit structure design, the cooling oil enters the trunk 211 from the oil inlet at the front end plate 21. Since the connection between the inner branch oil channel 212a, the middle branch oil channel 212c and the trunk 21 is blocked, the cooling oil enters the outer branch oil channel 212e and reaches the rear end through the magnetic steel groove located on the outer layer. The horizontal long arrows in the figure indicate that the cooling oil flows from front to back from left to right, and from right to left to indicate that the cooling oil flows from back to front. The second group of three-layer branch oil channels at the rear end corresponds to the first group of three-layer branch oil channels at the front end. Therefore, on the rear end plate, the oil throwing outlets of the middle branch oil channel 212d and the outer branch oil channel 212f are both blocked. The middle branch oil passage 212d and the outer branch oil passage 212f are connected through the trunk passage 211. Therefore, the cooling oil flows from the outer branch oil passage 212f into the middle branch oil passage 212d, and passes through the middle magnetic steel groove to reach the front end. On the front end plate, the middle branch oil passage 212c and the inner branch oil passage 212a are connected. The cooling oil flows from the middle branch oil passage 212c into the inner branch oil passage 212a, and passes through the inner magnetic steel groove to reach the rear end, and is thrown out from the oil throwing outlet of the inner branch oil passage 212b on the rear end plate, thereby realizing the three-way flow of cooling oil inside the rotor 10 and cooling the three layers of magnetic steel of the rotor.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cooling circuit structure for rotor magnetic steel, characterized in that: including a rotor and a rotor pressure plate; The rotor comprises a rotor core and a plurality of magnetic steels, wherein a plurality of magnetic steel slot groups are formed on the rotor core, each magnetic steel slot group has at least two layers of magnetic steel slots, the magnetic steels are installed in the magnetic steel slots one by one, and each layer of the magnetic steel slots is formed with cooling oil channels at both ends of the magnetic steels; The rotor pressure plate is annular and is arranged at both ends of the rotor. A plurality of tree-shaped oil channels are formed on a plate surface on one side of the rotor pressure plate close to the rotor core. Each of the tree-shaped oil channels includes a main channel and multiple layers of branch oil channels located on both sides of the main channel. The branch oil channels correspond one-to-one to the magnetic steel grooves. One end of the main channel extends to the middle of the ring to form an oil inlet. The cooling oil channel and the tree-shaped oil channel cooperate to form a cooling circuit.

2. The cooling circuit structure for rotor magnetic steel according to claim 1, characterized in that: One end of the branch oil channel is connected to the main channel, and the other end of the branch oil channel extends to the outer edge of the rotor pressure plate to form an oil throwing outlet. The branch oil channel blocks a predetermined position according to the number of layers of the magnetic steel groove.

3. The cooling circuit structure for rotor magnetic steel according to claim 2, characterized in that: The rotor pressure plate includes a front end plate located at the front end of the rotor and a rear end plate located at the rear end of the rotor.

4. The cooling circuit structure for rotor magnetic steel according to claim 3, characterized in that: The tree-shaped oil passage comprises two layers of branch oil passages, and the two layers of branch oil passages comprise an inner layer branch oil passage and an outer layer branch oil passage.

5. The cooling circuit structure for rotor magnetic steel according to claim 4, characterized in that: The connection between the inner branch oil passage on the front end plate and the trunk passage is blocked, and the oil throwing outlet of the outer branch oil passage on the front end plate is blocked; The main channel on the rear end plate connected to the inner layer branch oil channel is blocked, and the oil throwing outlets of the inner layer branch oil channel and the outer layer branch oil channel on the rear end plate are both blocked.

6. The cooling circuit structure for rotor magnetic steel according to claim 4, characterized in that: The main channel between the inner layer branch oil channel and the outer layer branch oil channel on the front end plate is blocked, and the oil throwing outlet of the inner layer branch oil channel on the front end plate is blocked; The oil inlet of the main channel on the rear end plate is blocked, and the oil throwing outlets of the inner layer branch oil channel and the outer layer branch oil channel on the rear end plate are both blocked.

7. The cooling circuit structure for rotor magnetic steel according to claim 3, characterized in that: The tree-shaped oil passage comprises three layers of branch oil passages, and the three layers of branch oil passages comprise an inner layer branch oil passage, a middle layer branch oil passage and an outer layer branch oil passage; On the front end plate, there are two groups of three-layer branch oil passages. In the first group, the connection between the inner branch oil passage, the middle branch oil passage and the main passage is blocked, the oil-slinging outlets of the inner branch oil passage, the middle branch oil passage and the outer branch oil passage are all blocked, and the inner branch oil passage and the middle branch oil passage are connected at one side close to the main passage; in the second group, the oil-slinging outlets of the middle branch oil passage and the outer branch oil passage are all blocked, the connection between the inner branch oil passage and the main passage is blocked, the middle branch oil passage and the outer branch oil passage are connected through the main passage, and the oil inlet of the main passage is blocked; The rear end plate and the front end plate have the same structure, and the first group of three-layer branch oil passages on the rear end plate and the second group of three-layer branch oil passages on the front end plate are arranged correspondingly.

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