Motor

Abstract

The invention relates to a motor which comprises a rotor, the rotor comprises an iron core and a permanent magnet part, the permanent magnet part is inserted into the iron core, a magnetic barrier groove is defined by the permanent magnet part and the iron core, the motor is provided with a cooling flow path used for cooling the rotor, the cooling flow path comprises a first branch flow path, and the magnetic barrier groove forms the first branch flow path. According to the technical scheme, the rotor in the motor is good in heat dissipation effect.

Description

Technical Field

[0001] The present disclosure relates to the technical field of motor heat dissipation, and in particular, to a motor. Background Art

[0002] In the related art, a motor such as an axial flux motor generally includes a stator and a rotor. Currently, the heat dissipation effect of the rotor is relatively poor. Summary of the invention

[0003] The object of the present disclosure is to provide a motor in which the heat dissipation effect of the rotor is better.

[0004] In order to achieve the above-mentioned purpose, the present disclosure provides a motor, including a rotor, wherein the rotor includes an iron core and a permanent magnet, the permanent magnet is inserted into the iron core and forms a magnetic barrier groove with the iron core, the motor is provided with a cooling flow path for cooling the rotor, the cooling flow path includes a first shunt path, wherein the magnetic barrier groove forms the first shunt path.

[0005] Optionally, the cooling flow path includes a second shunt flow path arranged upstream of the first shunt flow path, the motor includes a stator and a cover plate arranged on the stator, and the cover plate and the rotor form the second shunt flow path.

[0006] Optionally, the rotor includes a tray, the iron core is arranged on the tray, and the tray and the cover plate form the second shunt path, so that the second shunt path is connected to the upstream of the first shunt path.

[0007] Optionally, there is a gap between the iron core, the permanent magnet component and the cover plate, and an oil baffle is provided on the cover plate, and the oil baffle is used to limit the cooling oil in the second shunt path from entering the gap.

[0008] Optionally, the oil baffle is disposed in the second shunt passage and is constructed as an oil baffle plate protruding toward the tray, and the oil baffle plate is disposed close to the iron core and the permanent magnet member in the radial direction of the rotor.

[0009] Optionally, the tray has a groove for enclosing the second bypass path, the projection of the oil baffle plate in the axial direction of the rotor at least partially overlaps with the projection of the groove in the axial direction of the rotor, and the groove is recessed away from the oil baffle plate along the axial direction of the rotor.

[0010] Optionally, the interval between the oil baffle plate, the iron core and the permanent magnet in the radial direction of the rotor is 0.2 mm to 0.8 mm.

[0011] Optionally, the interval between the oil baffle plate, the iron core and the permanent magnet in the radial direction of the rotor is 0.5 mm.

[0012] Optionally, a plurality of the permanent magnets are inserted into the iron core, each of the permanent magnets and the iron core forms a magnetic barrier slot, each of the magnetic barrier slots forms a first shunt path, and a plurality of the first shunt paths are connected to the second shunt path.

[0013] Optionally, the cooling flow path includes a third shunt path, and the second shunt path connects the first shunt path and the third shunt path, wherein the motor includes a rotating shaft and a stator, a bearing sleeve, and a bearing sequentially sleeved on the outside of the rotating shaft along the radial direction of the rotating shaft, the rotor and the bearing sleeve are spaced apart in the axial direction of the rotor and form a spacing space, and the outer wall surface of the rotating shaft and the spacing space form the third shunt path.

[0014] Optionally, the motor includes a casing, and the cooling flow path includes a fourth branch path and a fifth branch path, the fourth branch path is arranged in the casing and has an inlet of the cooling flow path, the fifth branch path is arranged in the bearing sleeve, and the fifth branch path connects the fourth branch path and the third branch path.

[0015] Optionally, the cooling flow path includes a sixth branch flow path, the rotating shaft is provided with a cavity and the sixth branch flow path, the sixth branch flow path connects the third branch flow path and the cavity, and the cavity is provided with an inlet of the cooling flow path.

[0016] Optionally, the permanent magnet is constructed as magnetic steel.

[0017] Optionally, the electric machine is configured as an axial flux electric machine.

[0018] Through the above technical solution, in the motor provided by the present disclosure, the permanent magnet is used to make the magnetic field interact with the current to generate force and torque, so that the motor can operate. In order to avoid magnetic leakage in the motor, a magnetic barrier groove is provided between the iron core and the permanent magnet. Here, the present disclosure forms a first shunt path on the magnetic barrier groove, that is, at least part of the magnetic barrier groove is used as the first shunt path, so that the cooling oil in the cooling flow path can flow through the first shunt path on the magnetic barrier groove, thereby achieving direct cooling of the rotor and improving the heat dissipation effect of the rotor. In addition, since there is a magnetic barrier groove between the iron core and the magnetic steel, the present disclosure forms a first shunt path on the magnetic barrier groove, which can avoid opening the first shunt path at other positions on the rotor, and avoids damage to the rotor structure due to the setting of the first shunt path, thereby ensuring the structural strength of the rotor, that is, the above setting can have both the structural strength of the rotor and the heat dissipation effect of the rotor.

[0019] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a schematic diagram of the structure of a motor provided by an embodiment of the present disclosure; Figure 2 is an exploded schematic diagram of a motor provided by an embodiment of the present disclosure; Figure 3 is a partial structural schematic diagram of a rotor in a motor provided by an embodiment of the present disclosure; Figure 4 yes Figure 3 A magnified schematic diagram of point A; Figure 5 A cross-sectional view of a motor provided by an embodiment of the present disclosure; Figure 6 yes Figure 5 An enlarged schematic diagram of point B; Figure 7 is a cross-sectional view of a motor provided in another embodiment of the present disclosure.

[0021] Description of Reference Numerals 100-rotor; 110-iron core; 111-magnetic barrier groove; 112-magnetic steel groove; 113-clamping groove; 120-permanent magnet; 130-tray; 131-groove; 132-clamping rib; 133-oil outlet; 140-interval; 200-stator; 300-cover plate; 311-gap; 320-oil baffle; 321-oil baffle plate; 410-rotating shaft; 411-cavity; 412-inlet; 420-bearing; 421-bearing sleeve; 500-cooling flow path; 510-first shunt flow path; 520-second shunt flow path; 530-third shunt flow path; 540-fourth shunt flow path; 550-fifth shunt flow path; 560-sixth shunt flow path; 600-casing; 610-main body; 620-first end cover; 630-second end cover. DETAILED DESCRIPTION

[0022] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0023] In the present disclosure, unless otherwise stated, directional words such as "upper and lower" generally refer to the relative "upper and lower" in the direction of gravity when the corresponding parts are in use, and "inside and outside" generally refer to the "inside and outside" relative to the corresponding parts' own contours. The terms "first", "second", etc. used are to distinguish one element from another and do not have order and importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate the present disclosure and should not be understood as limitations on the present disclosure.

[0024] In the related technology, axial flux motors usually only involve heat dissipation of the stator, and most of them use water cooling. When dissipating the heat of the rotor, a heat dissipation channel is usually opened on the rotor and a cooling medium is introduced. In this way, the cooling medium can only flow in the heat dissipation channel, and it is difficult to directly contact the magnetic steel installed on the iron core to achieve heat exchange. In addition, the opening of the heat dissipation channel destroys the strength of the rotor and affects the service life of the motor.

[0025] In order to solve the above technical problems, according to the specific implementation methods provided by the present disclosure, reference is made to Figures 1 to 7 As shown in the figure, a motor is provided, including a rotor 100, the rotor 100 includes an iron core 110 and a permanent magnet 120, the permanent magnet 120 is inserted into the iron core 110, and forms a magnetic barrier groove 111 with the iron core 110, the motor is provided with a cooling flow path 500 for cooling the rotor 100, the cooling flow path 500 includes a first shunt path 510, wherein the magnetic barrier groove 111 forms the first shunt path 510.

[0026] Through the above technical solution, in the motor provided by the present invention, the permanent magnet 120 is used to make the magnetic field interact with the current to generate force and torque, so that the motor can operate, and in order to avoid magnetic leakage in the motor, a magnetic barrier groove 111 is arranged between the iron core 110 and the permanent magnet 120, and the rotor 100 includes the iron core 110 and the permanent magnet 120, and the magnetic barrier groove 111 is arranged between the iron core 110 and the permanent magnet 120. Here, the present invention forms a first shunt path 510 on the magnetic barrier groove 111, that is, at least a part of the magnetic barrier groove 111 is used as the first shunt path 510, thereby, the cooling oil in the cooling flow path 500 can flow through the first shunt path 510 on the magnetic barrier groove 111 as the cooling flow path 500, thereby realizing direct cooling of the rotor 100 and improving the heat dissipation effect of the rotor 100. In addition, since there is a magnetic barrier groove 111 between the iron core 110 and the permanent magnet member 120, the present disclosure forms the first shunt path 510 on the magnetic barrier groove 111, thereby avoiding the need to open the first shunt path 510 at other locations on the rotor 100, thereby avoiding damage to the structure of the rotor 100 due to the provision of the first shunt path 510, thereby ensuring the structural strength of the rotor 100, that is, the above-mentioned arrangement can have both the structural strength of the rotor 100 and the heat dissipation effect of the rotor 100.

[0027] It should be explained here that the cooling oil can be any medium that is insulating and can achieve heat exchange with the rotor 100, such as insulating oil or other refrigerants, etc., and the present disclosure does not impose specific restrictions on this. In addition, the motor provided by the present disclosure can be a coaxial flux motor with one stator and two rotors, and the two rotors are arranged on both sides of the axial direction of the stator and are sleeved together with the stator on the outside of the rotating shaft. In some other embodiments, the motor can also be an axial flux motor with one stator and one rotor, two stators and one rotor, or two stators and two rotors, and the present disclosure does not impose specific restrictions on this.

[0028] In the motor provided by the present disclosure, the cooling flow path 500 can be arranged in any suitable manner, and the present disclosure does not impose any specific limitation on this. Figure 5 and Figure 6 As shown in , the cooling flow path 500 may include a second shunt flow path 520 disposed upstream of the first shunt flow path 510, and the motor includes a stator 200 and a cover plate 300 disposed on the stator 200, and the cover plate 300 and the rotor 100 may enclose the second shunt flow path 520. In this way, the second shunt flow path 520 may be formed by utilizing the spacing between the cover plate 300 and the rotor 100, thereby avoiding the step of directly opening the second shunt flow path 520 on the cover plate 300 or the rotor 100, reducing damage to the structures of the two, and ensuring the structural strength of the cover plate 300 and the rotor 100. In the present disclosure, reference is made to Figure 2 and Figure 5As shown in the figure, the cover plate 300 is fixed to the stator 200 and there is a gap between the cover plate 300 and the rotor 100, so that the rotor 100 can rotate freely. Because the cover plate 300 is provided with a through hole for the rotating shaft 410 to pass through, the cooling oil can flow through the through hole from the side of the cover plate 300 facing the stator 200 to the side of the cover plate 300 facing the rotor 100, that is, the cooling oil can flow into the second shunt path 520, and then flow into the first shunt path 510, so as to cool the rotor 100.

[0029] Based on the above embodiments, the second flow path 520 can be formed in any suitable manner, and the present disclosure does not impose any specific limitation on this. Figure 3 and Figure 4 As shown in , the rotor 100 may include a tray 130, the iron core 110 may be disposed on the tray 130, and the tray 130 and the cover plate 300 may enclose a second shunt path 520, so that the second shunt path 520 is connected to the upstream of the first shunt path 510. In this way, the cooling oil in the second shunt path 520 can directly enter the first shunt path 510, that is, enter the magnetic barrier slot 111, compared with setting a connecting oil path between the first shunt path 510 and the second shunt path 520, the transfer efficiency of the cooling oil can be improved, and the heat dissipation effect can be improved.

[0030] In addition, the rotor 100 can be connected to the rotating shaft 410 by any suitable means. Figure 2 and Figure 3As shown in, in the present disclosure, the rotor 100 includes a tray 130, the iron core 110 is provided with a permanent magnet slot 112, the permanent magnet 120 is radially inserted in the permanent magnet slot 112 and forms a magnetic barrier slot 111 together with the permanent magnet slot 112, the magnetic barrier slot 111 forms a first shunt path 510, that is, the first shunt path 510 is a radial flow path, the iron core 110 is clamped with the tray 130 through a clamping portion, wherein the iron core 110 is provided with a clamping slot 113, and the tray 130 is provided with a clamping rib 132 that cooperates with the clamping slot 113, and the iron core 110 is buckled on the tray 130, so that the iron core 110 can be limited in the radial direction relative to the tray 130, and the tray 130 is fixedly connected to the rotating shaft 410 through a shrink fitting process, so that the transmission connection between the rotor 100 and the rotating shaft 410 is realized. In addition, the tray 130 is also formed with an oil outlet 133 corresponding to the magnetic barrier groove 111, that is, the first shunt path 510. When the motor is working, the cooling oil in the first shunt path 510 can be thrown out to the inner wall of the housing 600 through the oil outlet 133 under the action of centrifugal force, and then slide along the inner wall of the housing 600 under the action of its own gravity to the collection space at the bottom of the housing 600, so as to collect the cooling oil. Since the present disclosure does not involve the improvement of the technical solution of collecting cooling oil, it will not be described in detail here. In addition, the present disclosure does not involve the improvement of the structure and principle of the stator 200, so it will not be described in detail here.

[0031] In the motor provided by the present disclosure, in order to ensure the normal operation of the motor and the power factor of the motor, as an exemplary embodiment, reference is made to Figure 5 and Figure 6 As shown in , there is a gap 311 between the iron core 110 and the permanent magnet 120 and the cover plate 300, and an oil baffle can be provided on the cover plate 300, and the oil baffle can be used to limit the cooling oil in the second shunt path 520 from entering the gap 311. The setting of the oil baffle can, on the one hand, ensure that the cooling oil flows into the first shunt path 510 as much as possible after entering the second shunt path 520 to cool the iron core 110 and the permanent magnet 120, and on the other hand, it can reduce the possibility of the cooling oil in the second shunt path 520 entering the gap 311, avoid affecting the rotation of the rotor 100 relative to the stator 200, and ensure the power factor of the motor.

[0032] It should be noted that the gap 311 is used to ensure that the rotor 100 can rotate freely during the operation of the motor. In this way, although the existence of the gap 311 blocks the direct electromagnetic contact between the stator 200 and the rotor 100, when the stator 200 is powered on, the stator 200 and the rotor 100 can still establish an electromagnetic connection to achieve the conversion of electrical energy into mechanical energy. In addition, the size of the gap 311 is usually selected according to the size of the motor. Under the premise of ensuring that there is no friction between the rotor 100 and the stator 200, the smaller the gap 311, the smaller the magnetic resistance, the smaller the excitation loss, and the improved motor power performance. However, if the gap 311 is too small, it will lead to an increase in harmonic field, an increase in motor stray loss and noise, and a decrease in maximum torque and starting torque. Therefore, the gap 311 usually has a relatively strict size requirement, and the second shunt 520, that is, the distance between the tray 130 and the cover plate 300, can be designed according to the purpose of ensuring the free rotation of the rotor 100.

[0033] Based on the above embodiment, the oil blocking member can be arranged on the cover plate 300 in any suitable manner, and the present disclosure does not impose any specific limitation on this. Figure 5 and Figure 6 As shown in , the oil baffle can be arranged in the second shunt path 520, and can be constructed as an oil baffle plate 321 protruding toward the tray 130, and the oil baffle plate 321 is arranged near the iron core 110 and the permanent magnet 120 in the radial direction of the rotor 100. In this way, when the cooling oil flows in the radial direction after entering the second shunt path 520, due to the action of centrifugal force, the cooling oil has a tendency to be gradually thrown outward in the radial direction. When the cooling oil contacts the oil baffle plate, since the oil baffle plate 321 protrudes toward the tray 130, the cooling oil can flow axially toward the tray 130 and away from the cover plate 300 under the obstruction of the oil baffle plate 321. After being blocked by the tray 130, the cooling oil can flow into the first shunt path 510 formed between the iron core 110 and the permanent magnet 120 along the radial direction of the tray 130 under the action of centrifugal force. In this way, the purpose of preventing the cooling oil from flowing into the gap 311 can be achieved while ensuring that the cooling oil can enter the first shunt path 510.

[0034] On the basis of the above embodiment, in order to facilitate the cooling oil to flow from the second branch flow path 520 into the first branch flow path 510, as an exemplary embodiment, reference is made to Figure 6As shown in , the tray 130 may also have a groove 131 for enclosing a second shunt path 520 , and the projection of the oil baffle plate 321 in the axial direction of the rotor 100 may at least partially overlap with the projection of the groove 131 in the axial direction of the rotor 100 , and the groove 131 is recessed away from the oil baffle plate 321 . In this way, since the oil baffle plate protrudes toward the tray, when the groove is not set, the width of the second branch path 520 between the oil baffle plate and the tray will be narrower, which makes it difficult for the cooling oil in the second branch path 520 to flow into the first branch path. Here, the present invention can increase the width of the second branch path 520 between the oil baffle plate and the tray by setting the groove, so as to facilitate the cooling oil to flow from the second branch path 520 into the first branch path 510. On the other hand, since the oil baffle plate 321 protrudes toward the groove 131, and the axial projections of the oil baffle plate 321 and the groove 131 at least partially overlap, the cooling oil tends to flow toward the side with a larger path after being blocked by the oil baffle plate 321, that is, toward the tray 130, further preventing the cooling oil from flowing into the gap 311 formed between the rotor 100 and the cover plate 300.

[0035] In the motor provided by the present disclosure, in order to further improve the limiting effect of the oil baffle 321 on the cooling oil entering the gap 311, refer to Figure 5 As shown in , the oil baffle plate 321 and the iron core 110 and the permanent magnet 120 may have a preset distance in the radial direction, so that the cooling oil can flow into the first shunt path 510, i.e., the magnetic barrier groove 111, from the second shunt path 520 under the action of centrifugal force after entering the groove 131. In the process of generating a large amount of heat during the operation of the motor, the atomized cooling oil is difficult to enter or only a small amount enters the gap 311, thereby avoiding the increase of friction when the rotor 100 moves relative to the stator 200, and reducing the oil stirring loss of the motor. Among them, the radial spacing between the oil baffle plate 321 and the iron core 110 and the permanent magnet 120 can be 0.2mm~0.8mm, such as 0.3mm, 0.4mm, 0.6mm, 0.7mm, etc., and the present disclosure does not make specific restrictions on this. In the present disclosure, preferably, the radial spacing between the oil baffle plate 321 and the iron core 110 and the permanent magnet 120 can be 0.5 mm. In this way, it can be ensured that the iron core 110 and the permanent magnet 120 do not contact the oil baffle plate 321, so as to avoid generating excess friction between the rotor 100 and the oil baffle plate 321, affecting the operation of the motor. At the same time, it can limit the cooling oil from crossing the oil baffle plate 321 and entering the gap 311 as much as possible, thereby achieving the purpose of reducing the power loss of the motor.

[0036] In the motor provided in the present disclosure, as an exemplary embodiment, reference is made to Figure 3 and Figure 4As shown in , a plurality of permanent magnets 120 may be inserted into the core 110, each permanent magnet 120 and the core 110 may both form a magnetic barrier slot 111, each magnetic barrier slot 111 may form a first shunt path 510, and a plurality of first shunt paths 510 are connected to a second shunt path 520. The core 110 may be provided with a plurality of permanent magnet slots 112, the plurality of permanent magnet slots 112 are radially arranged along the radial direction of the core 110, and the plurality of permanent magnets 120 are inserted into the permanent magnet slots 112 one by one, so that the rotor 100 can evenly cut the magnetic field during the movement, and ensure the stable conversion of electromagnetic energy and mechanical energy. In addition, the plurality of magnetic barrier slots 111 are all provided with a first shunt path 510, so that after the cooling medium flows through the second shunt path 520 and enters the first shunt path 510, heat can be exchanged with each permanent magnet 120 and each part of the iron core 110, thereby achieving thorough and effective cooling of the rotor 100.

[0037] In the motor provided in the present disclosure, as an exemplary embodiment, reference is made to Figure 5 or Figure 7 As shown in , the cooling flow path 500 may further include a third shunt flow path 530, and the second shunt flow path 520 is connected to the first shunt flow path 510 and the third shunt flow path 530, wherein the motor includes a rotating shaft 410 and a stator 200, a bearing sleeve 421 and a bearing 420 sequentially sleeved on the outer side of the rotating shaft 410 along the radial direction of the rotating shaft 410, and the rotor 100 and the bearing sleeve 421 may be arranged at intervals in the radial direction of the rotor 100, and enclose a spacing space 140, and the outer wall surface of the rotating shaft 410 and the spacing space 140 enclose a third shunt flow path 530. Thus, the step of directly opening the third shunt flow path 530 on the rotating shaft 410 or the rotor 100 is avoided, the damage to the structures of the two is reduced, and the structural strength of the rotating shaft 410 and the rotor 100 is ensured. Specifically, in order to ensure that the rotor 100 can rotate freely during the operation of the motor, the end face of the bearing sleeve 421 is spaced apart from the rotor 100 and is sleeved on the outside of the rotating shaft 410 to form a spacing space 140. Because a cover plate 300 is provided at the end of the bearing sleeve 421, and the cover plate 300 is fixed to the stator 200, the rotor 100 and the cover plate 300 are also spaced apart, and the cover plate 300 is provided with a through hole for the rotating shaft 410 to pass through. Therefore, the bearing sleeve, the rotor and the rotating shaft form a third shunt path 530 extending from the end face of the bearing sleeve 421 along the axial direction of the rotating shaft 410 through the through hole to the surface of the rotor 100, and the third shunt path 530 is connected to the second shunt path 520 surrounded by the cover plate 300 and the rotor 100. In the present disclosure, the bearing sleeve 421 and the outer wall surface of the rotating shaft 410 also form an axial flow path extending axially along the rotating shaft 410, and the axial flow path is connected to the through hole, thereby enabling the cooling medium to flow between the axial flow path, the third branch path 530, the second branch path 520 and the first branch path 510.

[0038] In the motor provided by the present disclosure, the cooling oil can be introduced into the third branch flow path 530 in any suitable manner, and the present disclosure does not impose any specific limitation on this. Figure 2 and Figure 5 As shown in , the motor may include a housing 600, and the cooling flow path 500 may include a fourth branch flow path 540 and a fifth branch flow path 550. The fourth branch flow path 540 may be provided in the housing 600 and has an inlet of the cooling flow path 500. The fifth branch flow path 550 may be provided in the bearing sleeve 421, and the fifth branch flow path 550 communicates the fourth branch flow path 540 with the third branch flow path 530. That is, the cooling oil may enter the space surrounded by the two cover plates 300, that is, the space where the stator 200 is installed, from the inlet of the fourth branch flow path 540, and after cooling the stator 200, flow into the fifth branch flow path 550 formed on the bearing sleeve 421, flow into the third branch flow path 530 via the axial flow path formed between the bearing sleeve 421 and the rotating shaft 410, and then flow into the second branch flow path 520 and the first branch flow path 510 in sequence, and contact with the permanent magnet 120 and the iron core 110, so as to realize the cooling of the rotor 100.

[0039] In some other embodiments, the cooling oil may also be introduced into the third branch flow path 530 in other ways, which is not specifically limited in the present disclosure. Figure 7As shown in , the cooling flow path 500 may include a sixth branch flow path 560, the rotating shaft 410 may be provided with a cavity 411 and the sixth branch flow path 560, the sixth branch flow path 560 may connect the third branch flow path 530 and the cavity 411, and the cavity 411 may be provided with an inlet 412 of the cooling flow path 500. That is, the cooling oil may enter the cavity 411 through the inlet 412 provided on the rotating shaft 410, and then flow into the third branch flow path 530, and then flow into the second branch flow path 520 and the first branch flow path 510 in sequence, so as to realize the cooling of the rotor 100. Among them, the sixth branch path 560 can be arranged on the part of the rotating shaft 410 where the bearing sleeve 421 is sleeved, so as to realize the connection between the sixth branch path 560 and the axial flow path, that is, the third branch path 530. In this way, after entering the cavity 411, the cooling oil can flow into the axial flow path formed by the bearing sleeve 421 and the rotating shaft 410 through the sixth branch path 560, and finally flow into the second branch path 520 and the first branch path 510 through the through hole set on the cover plate 300. In some other embodiments, the sixth branch flow path 560 may also be arranged at a position corresponding to the second branch flow path 520, that is, a portion corresponding to the air gap formed between the upper cover plate 300 of the shaft 410 and the rotor 100. In this way, when the working shaft 410 of the motor rotates, the cooling oil entering the cavity 411 of the shaft 410 is thrown out from the sixth branch flow path 560 under the action of centrifugal force, and directly enters the air gap without passing through the axial flow path and the through hole. This can also achieve the purpose of cooling oil flowing into the first branch flow path 510 to cool the rotor 100. The present disclosure does not make any specific restrictions on this.

[0040] In the motor provided in the present disclosure, as an exemplary embodiment, the permanent magnet 120 can be made of any material that can maintain constant magnetism after magnetization, such as magnetic steel, etc., and the present disclosure does not make any specific limitations on this.

[0041] In the motor provided in the present disclosure, the motor can be constructed as any suitable motor, and the present disclosure does not impose specific restrictions on this. As an exemplary embodiment, the motor can be constructed as an axial flux motor, so that when the rotor 100 is provided with a magnetic barrier groove 111, the magnetic barrier groove 111 can be used as the first branch path 510 of the cooling flow path 500 of the rotor 100 to achieve effective cooling of the rotor 100. The motor provided in the present disclosure is a coaxial magnetic flux motor with a stator 200 and two rotors 100, and the two rotors 100 are arranged on both sides of the stator 200, and are sleeved together with the stator 200 on the outside of the rotating shaft 410. In some other embodiments, the motor can also be an axial flux motor with a stator 200 and a rotor 100, two stators 200 and a rotor 100, or two stators 200 and two rotors 100, and the present disclosure does not impose specific restrictions on this.

[0042] In summary, in the motor provided in the present disclosure, the housing 600 includes a main body 610 and a first end cover 620 and a second end cover 630 disposed on both sides of the main body 610. As an exemplary embodiment, refer to Figure 5 As shown in the figure, the cooling oil flows into the installation space of the stator 200 through the inlet of the fourth branch path 540 arranged on the casing 600, and after cooling the stator 200, flows into the third branch path 530 formed by the bearing sleeve 421, the rotating shaft 410 and the rotor 100 through the fifth branch path 550 arranged on the bearing sleeve 421, flows along the third branch path 530 until it is blocked by the tray 130, and then flows radially into the second branch path 520, flows in the second branch path 520 until it is blocked by the oil baffle plate 321 and enters the groove 131, and then flows into the first branch path 510, thereby realizing contact cooling of the rotor 100 and the permanent magnet 120.

[0043] As another exemplary embodiment, refer to Figure 7 As shown in , the cooling oil can also enter the cavity 411 through the inlet 412 arranged on the rotating shaft 410. In this way, when the sixth branch path 560 is arranged on the portion of the rotating shaft 410 corresponding to the bearing sleeve 421, the cooling oil can enter the third branch path 530 through the sixth branch path 560, flow along the third branch path 530 until it is blocked by the tray 130, and then flow radially into the second branch path 520. When the sixth branch path 560 is arranged at the portion corresponding to the air gap formed between the cover plate 300 and the rotor 100 on the rotating shaft 410, the cooling oil can be directly thrown into the second branch path 520 through the sixth branch path 560 under the action of centrifugal force, thereby realizing contact cooling of the rotor 100 and the permanent magnet 120.

[0044] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0045] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0046] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A motor, characterized in that: The motor comprises a rotor, which comprises an iron core and a permanent magnet. The permanent magnet is inserted into the iron core and forms a magnetic barrier groove with the iron core. The motor is provided with a cooling flow path for cooling the rotor. The cooling flow path comprises a first shunt path, wherein the magnetic barrier groove forms the first shunt path.

2. The motor according to claim 1, characterized in that The cooling flow path includes a second shunt flow path arranged upstream of the first shunt flow path. The motor includes a stator and a cover plate arranged on the stator. The cover plate and the rotor enclose the second shunt flow path.

3. The motor according to claim 2, characterized in that The rotor includes a tray, the iron core is arranged on the tray, and the tray and the cover plate form the second shunt path so that the second shunt path is connected to the upstream of the first shunt path.

4. The motor according to claim 3, characterized in that A gap is provided between the iron core, the permanent magnet and the cover plate, and an oil baffle is provided on the cover plate, wherein the oil baffle is used to limit the cooling oil in the second shunt path from entering the gap.

5. The motor according to claim 4, characterized in that The oil baffle is disposed in the second shunt passage and is configured as an oil baffle plate protruding toward the tray. The oil baffle plate is disposed close to the iron core and the permanent magnet in the radial direction of the rotor.

6. The motor according to claim 5, characterized in that The tray has a groove for enclosing the second shunt path, the projection of the oil baffle plate in the axial direction of the rotor at least partially overlaps with the projection of the groove in the axial direction of the rotor, and the groove is recessed away from the oil baffle plate along the axial direction of the rotor.

7. The motor according to claim 5, characterized in that The interval between the oil baffle plate, the iron core and the permanent magnet in the radial direction of the rotor is 0.2 mm to 0.8 mm.

8. The motor according to claim 7, characterized in that The interval between the oil baffle plate, the iron core and the magnetic steel in the radial direction of the rotor is 0.5 mm.

9. The motor according to claim 3, characterized in that A plurality of permanent magnets are inserted on the iron core, each of which and the iron core form a magnetic barrier slot, each of which forms a first shunt path, and a plurality of the first shunt paths are connected to the second shunt path.

10. The motor according to any one of claims 2 to 9, characterized in that: The cooling flow path includes a third shunt path, and the second shunt path connects the first shunt path and the third shunt path, wherein the motor includes a rotating shaft and a stator, a bearing sleeve and a bearing sequentially sleeved on the outer side of the rotating shaft along the radial direction of the rotating shaft, the rotor and the bearing sleeve are spaced apart in the axial direction of the rotor and form a spacing space, and the outer wall surface of the rotating shaft and the spacing space form the third shunt path.

11. The motor according to claim 10, characterized in that The motor includes a casing, and the cooling flow path includes a fourth branch flow path and a fifth branch flow path. The fourth branch flow path is arranged in the casing and has an inlet of the cooling flow path. The fifth branch flow path is arranged in the bearing sleeve, and the fifth branch flow path connects the fourth branch flow path and the third branch flow path.

12. The motor according to claim 10, characterized in that The cooling flow path includes a sixth branch flow path. The rotating shaft is provided with a cavity and the sixth branch flow path. The sixth branch flow path is connected with the third branch flow path and the cavity. The cavity is provided with an inlet of the cooling flow path.

13. The motor according to claim 1, characterized in that The permanent magnet is constructed of magnetic steel.

14. The motor according to claim 1, characterized in that The electric machine is designed as an axial flux machine.

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