Rotor assembly and motor

Abstract

The utility model belongs to the technical field of motors, and discloses a rotor assembly and a motor, the rotor assembly comprises a rotating shaft, a plurality of iron cores and magnetic steel, the rotating shaft is provided with a liquid storage cavity and a liquid outlet channel communicated with the liquid storage cavity, the plurality of iron cores are sleeved on the rotating shaft and are arranged side by side in sequence, and the iron cores are provided with second circulation holes and mounting holes. The second circulation holes in the multiple iron cores are sequentially communicated to form a second circulation channel, the liquid storage cavity is communicated with the second circulation channel through the liquid outlet channel, the magnetic steel is installed in the installation hole, a magnetic steel cooling hole is formed between the magnetic steel and the inner wall of the installation hole, and the magnetic steel cooling holes in the multiple iron cores are sequentially communicated to form a magnetic steel cooling channel. The second circulation channel is communicated with the outside through the magnetic steel cooling channel. The motor comprises the rotor assembly. According to the utility model, the liquid storage cavity, the liquid outlet channel, the second circulation channel and the magnetic steel cooling channel are communicated in sequence, so that the flow guide effect on oil liquid is good, and the oil liquid flows orderly.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a rotor assembly and a motor. Background Art

[0002] New energy vehicles have put forward "four highs and three lows" requirements for drive motors. The "four highs and three lows" are: high speed, high efficiency, high power density, high reliability, low noise, low vibration and low cost.

[0003] When a motor is running, it generates a large amount of heat. Temperature is one of the important factors affecting the motor's performance output and motor life. The high speed of the motor causes a large amount of gas friction loss on the surface of the high-speed rotating rotor, further worsening the rotor's operating environment. In addition, the rotor is in a small space, and the heat dissipation paths and methods are extremely limited, making rotor heat dissipation more difficult.

[0004] Motor cooling can be divided into air cooling, water cooling, and oil cooling according to the cooling medium. In air-cooled and water-cooled motors, the rotor is basically passively cooled, and the rotor heat dissipation method is mainly convection. The rotation of the rotor drives the flow of air, and the heat of the rotor is transferred to the stator assembly core through media such as air. The heat is then dissipated through conduction between the stator assembly core and the casing, ultimately achieving the purpose of heat dissipation. Oil-cooled motors can achieve active cooling of the rotor. The shaft is made into a hollow shaft structure, and the cooling oil is introduced into the shaft cavity through an oil pipe. In some designs, the oil in the shaft cavity is directly thrown out through the openings on its outer wall, or thrown out through the slots on the dynamic balance plate. In some designs, the oil in the shaft cavity is introduced into the rotor core through a conveying channel to achieve cooling of the rotor core.

[0005] However, in existing oil-cooled motors, the delivery channel set on the rotor assembly has a poor effect on guiding the oil, causing the flow of the oil to be disorderly and scattered, and it is impossible to ensure the uniformity and stability of the flow rate and flow velocity of the oil in the iron core and magnetic steel of the rotor assembly, resulting in poor cooling effect. Utility Model Content

[0006] The purpose of the utility model is to provide a rotor assembly and a motor, which can ensure the uniformity and stability of the flow rate and flow velocity of the oil in the iron core and the magnetic steel.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] A rotor assembly comprising:

[0009] A rotating shaft, wherein the rotating shaft is provided with a liquid storage cavity and a liquid outlet channel connected to the liquid storage cavity;

[0010] A plurality of iron cores are sleeved on the rotating shaft and arranged side by side in sequence, wherein the iron cores are provided with second circulation holes and mounting holes, wherein the second circulation holes on the plurality of iron cores are connected in sequence to form a second circulation channel, and the liquid storage chamber is connected to the second circulation channel through the liquid outlet channel;

[0011] The magnet is installed in the mounting hole, and a magnet cooling hole is formed between the magnet and the inner wall of the mounting hole. The magnet cooling holes on the multiple iron cores are connected in sequence to form a magnet cooling channel, and the second circulation channel is connected to the outside through the magnet cooling channel.

[0012] Preferably, a circulation groove is provided on the inner wall of the iron core, and a first circulation hole is formed between the circulation groove and the outer wall of the rotating shaft. The first circulation holes on the multiple iron cores are connected in sequence to form a first circulation channel, the liquid storage chamber is connected to the first circulation channel through the liquid outlet channel, and the first circulation channel is connected to the second circulation channel.

[0013] Preferably, it further includes two dynamic balancing plates, the two dynamic balancing plates are sleeved on the rotating shaft, the multiple iron cores are clamped between the two dynamic balancing plates, and a first transition flow channel is provided on the dynamic balancing plate, and the first circulation channel is connected to the second circulation channel through the first transition flow channel.

[0014] Preferably, both ends of the first circulation channel are respectively connected to the first transition flow channels of the two dynamic balancing plates, and each of the first transition flow channels is connected to one of the second circulation channels.

[0015] Preferably, in the axial direction of the rotating shaft, the liquid outlet channel is located in the middle of the first transition flow channels of the two dynamic balancing plates.

[0016] Preferably, the mounting holes correspond to the magnetic steels one by one, and are respectively provided with a plurality of types. A corresponding mounting hole and a corresponding magnetic steel form a magnetic steel cooling channel, and the plurality of magnetic steel cooling channels are connected in sequence, and one end of the plurality of magnetic steel cooling channels connected in sequence is connected to the second circulation channel, and the other end is connected to the outside.

[0017] Preferably, there are two types of mounting holes, namely a first mounting hole and a second mounting hole; and there are two types of magnetic steels, namely a first magnetic steel and a second magnetic steel.

[0018] The first magnetic steel is installed in the first mounting hole. A first magnetic steel cooling hole is formed between the first magnetic steel and the inner wall of the first mounting hole. The magnetic steel cooling channel formed by sequentially connecting the first magnetic steel cooling holes on the iron core is a third circulation channel. The second circulation channel is connected to the third circulation channel.

[0019] The second magnetic steel is installed in the second mounting hole, and a second magnetic steel cooling hole is formed between the second magnetic steel and the inner wall of the second mounting hole. The magnetic steel cooling channel formed by the plurality of second magnetic steel cooling holes on the iron core being connected in sequence is a fourth circulation channel, the third circulation channel is connected to the fourth circulation channel, and the fourth circulation channel is connected to the outside.

[0020] Preferably, the two third circulation channels form a group, and the second circulation channel is connected to the two third circulation channels in the group.

[0021] Preferably, the two fourth circulation channels form a group, and the third circulation channel is connected to the two fourth circulation channels in the group.

[0022] The motor comprises a housing, a stator assembly and the above-mentioned rotor assembly, wherein the stator assembly is arranged in the housing, and the rotor assembly is passed through the stator assembly.

[0023] Beneficial effects of the utility model:

[0024] By arranging a liquid outlet channel on the rotating shaft, the oil in the liquid storage chamber inside the rotating shaft can be stably and reliably transported to the second circulation channel in the iron core, so that the oil can cool the iron core from the inside. A magnetic steel cooling channel is formed between the iron core and the magnetic steel, so that the oil can cool multiple magnetic steels. The liquid storage chamber, the liquid outlet channel, the second circulation channel and the magnetic steel cooling channel are connected in sequence and finally connected to the outside through the magnetic steel cooling channel, which has a good flow diversion effect on the oil, makes the flow of the oil orderly, ensures the uniformity and stability of the flow rate and flow velocity of the oil in the iron core and the magnetic steel, and improves the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the rotor assembly according to an embodiment of the present utility model;

[0026] Figure 2 is an axial cross-sectional view of the rotor assembly according to an embodiment of the present utility model;

[0027] Figure 3 is a radial cross-sectional view of the rotor assembly according to an embodiment of the present utility model;

[0028] Figure 4 This is a schematic structural diagram of the iron core and magnetic steel according to an embodiment of the present utility model;

[0029] Figure 5 It is a structural schematic diagram of the iron core according to an embodiment of the present utility model;

[0030] Figure 6It is a structural schematic diagram of the dynamic balancing plate according to an embodiment of the present utility model;

[0031] Figure 7 It is a structural schematic diagram of the oil circulation pipeline described in an embodiment of the utility model.

[0032] In the picture:

[0033] 1. Rotating shaft; 11. Liquid storage chamber; 12. Liquid outlet channel; 13. Liquid inlet channel;

[0034] 2. Iron core; 21. Circulation slot; 22. Second circulation hole; 23. First mounting hole; 24. Second mounting hole;

[0035] 3. Magnetic steel;

[0036] 4. Dynamic balance board;

[0037] 101, first circulation channel; 102, second circulation channel; 103, third circulation channel; 104, fourth circulation channel;

[0038] 201, first transition channel; 202, second transition channel; 203, third transition channel; 204, fourth transition channel. DETAILED DESCRIPTION

[0039] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0040] In the description of this utility model, unless otherwise expressly specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, mechanical or electrical connections, direct or indirect connections through an intermediate medium, and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0041] In the description of the present utility model, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0043] Example 1

[0044] like Figure 1-Figure 7 As shown, the present invention provides a rotor assembly, including a rotating shaft 1, a plurality of iron cores 2 and magnetic steel 3. Among them, a liquid storage chamber 11 is provided in the rotating shaft 1, and a liquid outlet channel 12 connected to the liquid storage chamber 11 is provided on the outer peripheral wall of the rotating shaft 1. A plurality of iron cores 2 are sleeved on the rotating shaft 1 and arranged side by side in sequence. A circulation groove 21 is provided on the inner wall of the iron core 2, and a first circulation hole is formed between the circulation groove 21 and the outer wall of the rotating shaft 1. A second circulation hole 22 and a mounting hole are provided on the iron core 2. The first circulation holes on the plurality of iron cores 2 are connected in sequence to form a first circulation channel 101, the liquid storage chamber 11 is connected to the first circulation channel 101 through the liquid outlet channel 12, and the second circulation holes 22 on the plurality of iron cores 2 are connected in sequence to form a second circulation channel 102. The first circulation channel 101 is connected to the second circulation channel 102, and the magnet 3 is installed in the mounting hole. A magnet cooling hole is formed between the magnet 3 and the inner wall of the mounting hole. The magnet cooling holes on the plurality of iron cores 2 are connected in sequence to form a magnet cooling channel, and the second circulation channel 102 is connected to the outside through the magnet cooling channel.

[0045] In this embodiment, a first circulation channel 101 is formed between the rotating shaft 1 and the iron core 2, so that the oil in the liquid storage chamber 11 inside the rotating shaft 1 can be stably and reliably transported to the inner wall of the iron core 2, thereby cooling the multiple iron cores 2 from the outside. A second flow channel connected to the first circulation channel 101 is provided on the iron core 2, so that the oil can cool the iron core 2 from the inside. A magnetic steel cooling channel is formed between the iron core 2 and the magnetic steel 3, so that the oil can cool the multiple magnetic steels 3. The liquid storage chamber 11, the liquid outlet channel 12, the first circulation channel 101, the second circulation channel 102 and the magnetic steel cooling channel are connected in sequence, and finally connected to the outside through the magnetic steel cooling channel, which has a good flow diversion effect on the oil, makes the flow of the oil orderly, ensures the uniformity and stability of the flow rate and flow velocity of the oil in the iron core 2 and the magnetic steel 3, and improves the cooling effect.

[0046] Specifically, the rotor assembly also includes two dynamic balancing plates 4, which are sleeved on the rotating shaft 1. The multiple iron cores 2 are sandwiched between the two dynamic balancing plates 4. The dynamic balancing plates 4 are provided with a first transition flow channel 201, through which the first circulation channel 101 connects to the second circulation channel 102. The provision of the first transition flow channel 201 allows oil to flow smoothly from the first circulation channel 101 to the second circulation channel 102, further ensuring the uniformity and stability of the oil flow rate and flow velocity in the iron cores 2 and the magnetic steel 3.

[0047] More specifically, the dynamic balancing plate 4 is further provided with a second transition channel 202, through which the second circulation channel 102 connects to the magnetic steel cooling channel. The provision of the second transition channel 202 allows the oil to flow smoothly from the second circulation channel 102 into the magnetic steel cooling channel, further ensuring the uniformity and stability of the oil flow rate and flow velocity in the iron core 2 and magnetic steel 3.

[0048] In this embodiment, the iron core 2 and the dynamic balancing plate 4 are both annular plates, which are coaxially sleeved on the rotating shaft 1. The iron core 2 is formed by stacking multiple rotor punchings, and there are six of them, which are staggered and stacked in the axial direction. There is an interference fit between the iron core 2 and the rotating shaft 1, and there is an interference fit between the dynamic balancing plate 4 and the rotating shaft 1. The magnetic steel 3 is embedded in the mounting hole of the iron core 2. The first transition flow channel 201 extends in an L shape, from the first flow channel 101 to the second flow channel 102. The first transition flow channel 201 first extends in the radial direction of the iron core 2 and then extends in the circumferential direction of the iron core 2. The second transition flow channel 202 is in the shape of an elongated strip and extends in the circumferential direction of the iron core 2.

[0049] Specifically, the two ends of the first circulation channel 101 are respectively connected to the first transition flow channels 201 of the two dynamic balancing plates 4, and each first transition flow channel 201 is connected to a second circulation channel 102, so that the oil flowing out of the liquid outlet channel 12 is split in the first circulation channel 101 and flows in opposite directions, and finally flows into the two second circulation channels 102 through the first transition flow channels 201 of the two dynamic balancing plates 4, and finally makes the flow directions of the oil in the two second circulation channels 102 opposite, thereby improving the uniformity and stability of the flow rate and flow velocity of the oil in the iron core 2, effectively ensuring the dynamic balance of the rotor assembly during the cooling and heat dissipation process, and improving the stability of the rotor assembly operation.

[0050] More specifically, in the axial direction of the rotating shaft 1, the liquid outlet channel 12 is located in the middle of the first transition flow channels 201 of the two dynamic balancing plates 4. The above arrangement further ensures the dynamic balance of the rotor assembly during the cooling and heat dissipation process, and improves the stability of the rotor assembly operation.

[0051] Specifically, a plurality of first circulation channels 101 are provided, each of which is connected to the liquid storage chamber 11 via a liquid outlet channel 12. The two ends of each first circulation channel 101 are connected to a second circulation channel 102 via a first transition channel 201. The liquid storage chamber 11 is located axially of the rotating shaft 1. The plurality of liquid outlet channels 12 are evenly distributed along the circumference of the rotating shaft 1. The plurality of first circulation channels 101 are evenly distributed along the circumference of the rotating shaft 1. The plurality of second circulation channels 102 are evenly distributed along the circumference of the rotating shaft 1. This arrangement ensures dynamic balance of the rotor assembly during rotation, thereby allowing the oil to flow evenly and stably through the iron core 2 and the magnetic steel 3.

[0052] In this embodiment, a liquid inlet channel 13 is provided on the rotating shaft 1. The liquid inlet channel 13 and the liquid storage chamber 11 are arranged coaxially. One end of the liquid inlet channel 13 is connected to the end surface of the rotating shaft 1, and the other end is connected to the liquid storage chamber 11. There are three first circulation channels 101, three liquid outlet channels 12, and six second circulation channels 102. This arrangement ensures a uniform flow rate and flow rate of the oil, with the center angle of adjacent liquid outlet channels 12 being 120° and the center angle of adjacent second circulation channels 102 being 60°.

[0053] In other embodiments, one, two, or more than three first circulation channels 101 may be provided.

[0054] Specifically, mounting holes correspond one to one with the magnets 3, and multiple mounting holes are provided. The sizes of the mounting holes vary, and the sizes of the magnets 3 vary. Each mounting hole and each magnet 3 form a magnet cooling channel. The multiple magnet cooling channels are sequentially connected, with one end of each of the sequentially connected magnet cooling channels connected to the second circulation channel 102 and the other end connected to the outside. This arrangement effectively guides the oil, ensuring orderly oil flow during cooling operations, allowing the oil to sequentially cool magnets 3 of various sizes.

[0055] More specifically, two types of mounting holes are provided: a first mounting hole 23 and a second mounting hole 24. Two types of magnetic steel 3 are provided: a first magnetic steel and a second magnetic steel. The first magnetic steel is installed in the first mounting hole 23. A first magnetic steel cooling hole is formed between the first magnetic steel and the inner wall of the first mounting hole 23. The first magnetic steel cooling holes on multiple cores 2 are sequentially connected to form a magnetic steel cooling channel, which is a third circulation channel 103. The second circulation channel 102 is connected to the third circulation channel 103. The second magnetic steel is installed in the second mounting hole 24. A second magnetic steel cooling hole is formed between the second magnetic steel and the inner wall of the second mounting hole 24. The second magnetic steel cooling holes on multiple cores 2 are sequentially connected to form a magnetic steel cooling channel, which is a fourth circulation channel 104. The third circulation channel 103 is connected to the fourth circulation channel 104, and the fourth circulation channel 104 is connected to the outside. The above arrangement has a good effect on guiding the oil. During the cooling operation, the oil flows in the third circulation channel 103 and the fourth circulation channel 104 in an orderly manner, so that the oil can cool the first magnetic steel and the second magnetic steel in turn.

[0056] In this embodiment, the second circulation channel 102 is connected to the third circulation channel 103 through the second transition channel 202 .

[0057] Specifically, one of the two dynamic balancing plates 4 is provided with a third transition channel 203, and the other is provided with a fourth transition channel 204. The third circulation channel 103 is connected to the fourth circulation channel 104 via the third transition channel 203, and the fourth circulation channel 104 is connected to the outside via the fourth transition channel 204. This arrangement, through the provision of the third transition channel 203 and the fourth transition channel 204, allows oil to flow smoothly from the third circulation channel 103 to the fourth circulation channel 104 and ultimately out of the fourth circulation channel 104.

[0058] More specifically, the third transition channel 203 and the fourth transition channel 204 both extend in the radial direction of the iron core 2 to adapt to the flow trend of the oil during centrifugal motion.

[0059] In this embodiment, for the six second circulation channels 102, three third transition flow channels 203 and three fourth transition flow channels 204 are provided on each dynamic balancing plate 4. The fourth transition flow channels 204 are connected to the outside through the outflow hole. The oil in the three second circulation channels 102 first flows into the three third transition flow channels 203 on the first dynamic balancing plate 4 in a one-to-one correspondence, and then flows into the three fourth transition flow channels 204 on the second dynamic balancing plate 4 in a one-to-one correspondence before flowing out through the outflow hole. The oil in the other three second circulation channels 102 first flows into the three third transition flow channels 203 on the second dynamic balancing plate 4 in a one-to-one correspondence, and then flows into the three fourth transition flow channels 204 on the first dynamic balancing plate 4 in a one-to-one correspondence before flowing out through the outflow hole.

[0060] In other embodiments, the mounting holes and the magnetic steels 3 correspond one to one, and one or more types may be provided respectively.

[0061] Specifically, two third circulation channels 103 form a group, and the second circulation channel 102 is connected to the two third circulation channels 103 in one group. The above arrangement improves the cooling efficiency of the oil on the first magnetic steel.

[0062] More specifically, two fourth circulation channels 104 form a group, and the third circulation channel 103 is connected to the two fourth circulation channels 104 in the group. The above arrangement improves the cooling efficiency of the oil on the second magnetic steel.

[0063] More specifically, if Figure 3 As shown, the distance between the third flow channel 103 and the axis of the core 2 is L1, and the distance between the fourth flow channel 104 and the axis of the core 2 is L2, where L1 is smaller than L2. The above arrangement adapts to the flow trend of the oil during centrifugal motion, making the oil flow smoother and more efficient.

[0064] In this embodiment, each second circulation channel 102 connects to two adjacent third circulation channels 103 via a second transition channel 202. Two adjacent third circulation channels 103 connect to two adjacent fourth circulation channels 104 via a third transition channel 203. Two adjacent fourth circulation channels 104 connect to the outside via a fourth transition channel 204. This arrangement ensures that the oil removes heat from the iron core 2, the first magnetic steel, and the second magnetic steel uniformly and stably, minimizing temperature fluctuations.

[0065] In the rotor assembly of this embodiment, the oil circulation pipeline specifically includes a liquid inlet channel 13, a liquid storage chamber 11, a liquid outlet channel 12, a first circulation channel 101, a first transition flow channel 201, a second circulation channel 102, a second transition flow channel 202, a third circulation channel 103, a third transition flow channel 203, a fourth circulation channel 104 and an outflow hole, which are connected in sequence.

[0066] This embodiment further provides a motor, comprising a housing, a stator assembly and the above-mentioned rotor assembly, wherein the stator assembly is disposed in the housing, and the rotor assembly is disposed through the stator assembly.

[0067] In the motor of this embodiment, a first flow channel 101 is formed between the rotating shaft 1 and the iron core 2, so that the oil in the liquid storage chamber 11 inside the rotating shaft 1 can be stably and reliably transported to the inner wall of the iron core 2, thereby cooling the multiple iron cores 2 from the outside. A second flow channel connected to the first flow channel 101 is provided on the iron core 2, so that the oil can cool the iron core 2 from the inside. A magnetic steel cooling channel is formed between the iron core 2 and the magnetic steel 3, so that the oil can cool the multiple magnetic steels 3. The liquid storage chamber 11, the liquid outlet channel 12, the first flow channel 101, the second flow channel 102 and the magnetic steel cooling channel are connected in sequence, and finally connected to the outside through the magnetic steel cooling channel, which has a good flow diversion effect on the oil, makes the flow of the oil orderly, ensures the uniformity and stability of the flow rate and flow velocity of the oil in the iron core 2 and the magnetic steel 3, and improves the cooling effect.

[0068] Example 2

[0069] like Figure 1-Figure 7 As shown, the present invention provides a rotor assembly, including a rotating shaft 1, a plurality of iron cores 2, a magnetic steel 3 and two dynamic balancing plates 4. Among them, a liquid storage chamber 11 and a liquid outlet channel 12 connected to the liquid storage chamber 11 are provided on the rotating shaft 1, and multiple iron cores 2 are sleeved on the rotating shaft 1 and arranged side by side in sequence. A second flow hole 22 and a mounting hole are provided on the iron core 2. The second flow holes 22 on the multiple iron cores 2 are connected in sequence to form a second flow channel 102. The magnet 3 is installed in the mounting hole. A magnet cooling hole is formed between the magnet 3 and the inner wall of the mounting hole. The magnet cooling holes on the multiple iron cores 2 are connected in sequence to form a magnet cooling channel. The second flow channel 102 is connected to the outside through the magnet cooling channel. Two dynamic balancing plates 4 are sleeved on the rotating shaft 1, and multiple iron cores 2 are clamped between the two dynamic balancing plates 4. A first transition flow channel 201 is provided on the dynamic balancing plate 4. The liquid storage chamber 11 is connected to the first transition flow channel 201 through the liquid outlet channel 12, and the first transition flow channel 201 is connected to the second flow channel 102.

[0070] In this embodiment, by providing a liquid outlet channel 12 on the rotating shaft 1, the oil in the liquid storage chamber 11 inside the rotating shaft 1 can be stably and reliably output. By providing a first transition flow channel 201 on the dynamic balancing plate 4, the oil output from the liquid outlet channel 12 can be stably and reliably transported to the second circulation channel 102 in the iron core 2, so that the oil can cool the iron core 2 from the inside. A magnetic steel cooling channel is formed between the iron core 2 and the magnetic steel 3, so that the oil can cool the multiple magnetic steels 3. The liquid storage chamber 11, the liquid outlet channel 12, the first transition flow channel 201, the second circulation channel 102 and the magnetic steel cooling channel are connected in sequence and finally connected to the outside through the magnetic steel cooling channel, which has a good flow diversion effect on the oil, makes the flow of the oil orderly, ensures the uniformity and stability of the flow rate and flow velocity of the oil in the iron core 2 and the magnetic steel 3, and improves the cooling effect.

[0071] Specifically, the inner wall of the iron core 2 is provided with a flow groove 21, forming a first flow hole between the flow groove 21 and the outer wall of the rotating shaft 1. The first flow holes on the multiple iron cores 2 are sequentially connected to form a first flow channel 101. The liquid storage chamber 11 is connected to the first flow channel 101 via the liquid outlet channel 12, and the first flow channel 101 is connected to the second flow channel 102 via the first transition channel 201. This arrangement ensures that the oil in the liquid storage chamber 11 inside the rotating shaft 1 can first be stably and reliably transported to the inner wall of the iron core 2, cooling the multiple iron cores 2 from the outside, and then flowing into the second flow channel 102 through the first transition channel 201.

[0072] More specifically, the dynamic balancing plate 4 is provided with a second transition channel 202, through which the second circulation channel 102 connects to the magnetic steel cooling channel. The provision of the second transition channel 202 allows the oil to flow smoothly from the second circulation channel 102 into the magnetic steel cooling channel, further ensuring the uniformity and stability of the oil flow rate and flow velocity in the iron core 2 and magnetic steel 3.

[0073] In this embodiment, the iron core 2 and the dynamic balancing plate 4 are both annular plates, which are coaxially sleeved on the rotating shaft 1. The iron core 2 is formed by stacking multiple rotor punchings, and there are six of them, which are staggered and stacked in the axial direction. There is an interference fit between the iron core 2 and the rotating shaft 1, and there is an interference fit between the dynamic balancing plate 4 and the rotating shaft 1. The magnetic steel 3 is embedded in the mounting hole of the iron core 2. The first transition flow channel 201 extends in an L shape, from the first flow channel 101 to the second flow channel 102. The first transition flow channel 201 first extends in the radial direction of the iron core 2 and then extends in the circumferential direction of the iron core 2. The second transition flow channel 202 is in the shape of an elongated strip and extends in the circumferential direction of the iron core 2.

[0074] In other embodiments, the first circulation channel 101 may not be provided between the inner wall of the iron core 2 and the outer wall of the rotating shaft 1 , and the liquid outlet channel 12 may be directly connected to the first transition flow channel 201 .

[0075] Specifically, the two ends of the first circulation channel 101 are respectively connected to the first transition flow channels 201 of the two dynamic balancing plates 4, and each first transition flow channel 201 is connected to a second circulation channel 102, so that the oil flowing out of the liquid outlet channel 12 is split in the first circulation channel 101 and flows in opposite directions, and finally flows into the two second circulation channels 102 through the first transition flow channels 201 of the two dynamic balancing plates 4, and finally makes the flow directions of the oil in the two second circulation channels 102 opposite, thereby improving the uniformity and stability of the flow rate and flow velocity of the oil in the iron core 2, effectively ensuring the dynamic balance of the rotor assembly during the cooling and heat dissipation process, and improving the stability of the rotor assembly operation.

[0076] More specifically, in the axial direction of the rotating shaft 1, the liquid outlet channel 12 is located in the middle of the first transition flow channels 201 of the two dynamic balancing plates 4. The above arrangement further ensures the dynamic balance of the rotor assembly during the cooling and heat dissipation process, and improves the stability of the rotor assembly operation.

[0077] Specifically, a plurality of first circulation channels 101 are provided, each of which is connected to the liquid storage chamber 11 via a liquid outlet channel 12. The two ends of each first circulation channel 101 are connected to a second circulation channel 102 via a first transition channel 201. The liquid storage chamber 11 is located axially of the rotating shaft 1. The plurality of liquid outlet channels 12 are evenly distributed along the circumference of the rotating shaft 1. The plurality of first circulation channels 101 are evenly distributed along the circumference of the rotating shaft 1. The plurality of second circulation channels 102 are evenly distributed along the circumference of the rotating shaft 1. This arrangement ensures dynamic balance of the rotor assembly during rotation, thereby allowing the oil to flow evenly and stably through the iron core 2 and the magnetic steel 3.

[0078] In this embodiment, a liquid inlet channel 13 is provided on the rotating shaft 1. The liquid inlet channel 13 and the liquid storage chamber 11 are arranged coaxially. One end of the liquid inlet channel 13 is connected to the end surface of the rotating shaft 1, and the other end is connected to the liquid storage chamber 11. There are three first circulation channels 101, three liquid outlet channels 12, and six second circulation channels 102. This arrangement ensures a uniform flow rate and flow rate of the oil, with the center angle of adjacent liquid outlet channels 12 being 120° and the center angle of adjacent second circulation channels 102 being 60°.

[0079] In other embodiments, one, two, or more than three first circulation channels 101 may be provided.

[0080] Specifically, mounting holes correspond one to one with the magnets 3, and multiple mounting holes are provided. The sizes of the mounting holes vary, and the sizes of the magnets 3 vary. Each mounting hole and each magnet 3 form a magnet cooling channel. The multiple magnet cooling channels are sequentially connected, with one end of each of the sequentially connected magnet cooling channels connected to the second circulation channel 102 and the other end connected to the outside. This arrangement effectively guides the oil, ensuring orderly oil flow during cooling operations, allowing the oil to sequentially cool magnets 3 of various sizes.

[0081] More specifically, two types of mounting holes are provided: a first mounting hole 23 and a second mounting hole 24. Two types of magnetic steel 3 are provided: a first magnetic steel and a second magnetic steel. The first magnetic steel is installed in the first mounting hole 23. A first magnetic steel cooling hole is formed between the first magnetic steel and the inner wall of the first mounting hole 23. The first magnetic steel cooling holes on multiple cores 2 are sequentially connected to form a magnetic steel cooling channel, which is a third circulation channel 103. The second circulation channel 102 is connected to the third circulation channel 103. The second magnetic steel is installed in the second mounting hole 24. A second magnetic steel cooling hole is formed between the second magnetic steel and the inner wall of the second mounting hole 24. The second magnetic steel cooling holes on multiple cores 2 are sequentially connected to form a magnetic steel cooling channel, which is a fourth circulation channel 104. The third circulation channel 103 is connected to the fourth circulation channel 104, and the fourth circulation channel 104 is connected to the outside. The above arrangement has a good effect on guiding the oil. During the cooling operation, the oil flows in the third circulation channel 103 and the fourth circulation channel 104 in an orderly manner, so that the oil can cool the first magnetic steel and the second magnetic steel in turn.

[0082] More specifically, one of the two dynamic balancing plates 4 is provided with a third transition channel 203, and the other is provided with a fourth transition channel 204. The third circulation channel 103 is connected to the fourth circulation channel 104 via the third transition channel 203, and the fourth circulation channel 104 is connected to the outside via the fourth transition channel 204. The provision of the third transition channel 203 and the fourth transition channel 204 allows oil to flow smoothly from the third circulation channel 103 into the fourth circulation channel 104 and ultimately out of the fourth circulation channel 104.

[0083] In this embodiment, the second circulation channel 102 is connected to the third circulation channel 103 through the second transition channel 202 .

[0084] Specifically, the third transition channel 203 and the fourth transition channel 204 both extend in the radial direction of the iron core 2 to adapt to the flow trend of the oil during centrifugal motion.

[0085] In this embodiment, for the six second circulation channels 102, three third transition flow channels 203 and three fourth transition flow channels 204 are provided on each dynamic balancing plate 4. The fourth transition flow channels 204 are connected to the outside through the outflow hole. The oil in the three second circulation channels 102 first flows into the three third transition flow channels 203 on the first dynamic balancing plate 4 in a one-to-one correspondence, and then flows into the three fourth transition flow channels 204 on the second dynamic balancing plate 4 in a one-to-one correspondence before flowing out through the outflow hole. The oil in the other three second circulation channels 102 first flows into the three third transition flow channels 203 on the second dynamic balancing plate 4 in a one-to-one correspondence, and then flows into the three fourth transition flow channels 204 on the first dynamic balancing plate 4 in a one-to-one correspondence before flowing out through the outflow hole.

[0086] In other embodiments, the mounting holes and the magnetic steels 3 correspond one to one, and one or more types may be provided respectively.

[0087] Specifically, two third circulation channels 103 form a group, and the second circulation channel 102 is connected to the two third circulation channels 103 in one group. The above arrangement improves the cooling efficiency of the oil on the first magnetic steel.

[0088] More specifically, two fourth circulation channels 104 form a group, and the third circulation channel 103 is connected to the two fourth circulation channels 104 in the group. The above arrangement improves the cooling efficiency of the oil on the second magnetic steel.

[0089] More specifically, if Figure 3 As shown, the distance between the third flow channel 103 and the axis of the core 2 is L1, and the distance between the fourth flow channel 104 and the axis of the core 2 is L2, where L1 is smaller than L2. The above arrangement adapts to the flow trend of the oil during centrifugal motion, making the oil flow smoother and more efficient.

[0090] In this embodiment, each second circulation channel 102 connects to two adjacent third circulation channels 103 via a second transition channel 202. Two adjacent third circulation channels 103 connect to two adjacent fourth circulation channels 104 via a third transition channel 203. Two adjacent fourth circulation channels 104 connect to the outside via a fourth transition channel 204. This arrangement ensures that the oil removes heat from the iron core 2, the first magnetic steel, and the second magnetic steel uniformly and stably, minimizing temperature fluctuations.

[0091] In the rotor assembly of this embodiment, the oil circulation pipeline specifically includes a liquid inlet channel 13, a liquid storage chamber 11, a liquid outlet channel 12, a first circulation channel 101, a first transition flow channel 201, a second circulation channel 102, a second transition flow channel 202, a third circulation channel 103, a third transition flow channel 203, a fourth circulation channel 104 and an outflow hole, which are connected in sequence.

[0092] This embodiment further provides a motor, comprising a housing, a stator assembly and the above-mentioned rotor assembly, wherein the stator assembly is disposed in the housing, and the rotor assembly is disposed through the stator assembly.

[0093] In the motor of this embodiment, by providing a liquid outlet channel 12 on the rotating shaft 1, the oil in the liquid storage chamber 11 inside the rotating shaft 1 can be stably and reliably discharged. By providing a first transition flow channel 201 on the dynamic balancing plate 4, the oil output from the liquid outlet channel 12 can be stably and reliably transported to the second circulation channel 102 in the iron core 2, so that the oil can cool the iron core 2 from the inside. A magnetic steel cooling channel is formed between the iron core 2 and the magnetic steel 3, so that the oil can cool the multiple magnetic steels 3. The liquid storage chamber 11, the liquid outlet channel 12, the first transition flow channel 201, the second circulation channel 102 and the magnetic steel cooling channel are connected in sequence, and finally connected to the outside through the magnetic steel cooling channel. This has a good flow diversion effect on the oil, makes the flow of the oil orderly, ensures the uniformity and stability of the flow rate and flow velocity of the oil in the iron core 2 and the magnetic steel 3, and improves the cooling effect.

[0094] Example 3

[0095] like Figure 1-Figure 7 As shown, the present invention provides a rotor assembly, including a rotating shaft 1, multiple iron cores 2, and magnetic steel 3. The rotating shaft 1 is provided with a liquid storage chamber 11 and a liquid outlet channel 12 connected to the liquid storage chamber 11. The multiple iron cores 2 are sleeved on the rotating shaft 1 and arranged side by side in sequence. The iron cores 2 are provided with second circulation holes 22 and mounting holes. The second circulation holes 22 on the multiple iron cores 2 are connected in sequence to form a second circulation channel 102. The liquid storage chamber 11 is connected to the second circulation channel 102 through the liquid outlet channel 12. The magnetic steel 3 is installed in the mounting hole. A magnetic steel cooling hole is formed between the magnetic steel 3 and the inner wall of the mounting hole. The magnetic steel cooling holes on the multiple iron cores 2 are connected in sequence to form a magnetic steel cooling channel. The second circulation channel 102 is connected to the outside through the magnetic steel cooling channel.

[0096] In this embodiment, by providing a liquid outlet channel 12 on the rotating shaft 1, the oil in the liquid storage chamber 11 inside the rotating shaft 1 can be stably and reliably transported to the second circulation channel 102 in the iron core 2, so that the oil can cool the iron core 2 from the inside. A magnetic steel cooling channel is formed between the iron core 2 and the magnetic steel 3, so that the oil can cool the multiple magnetic steels 3. The liquid storage chamber 11, the liquid outlet channel 12, the second circulation channel 102 and the magnetic steel cooling channel are connected in sequence, and finally connected to the outside through the magnetic steel cooling channel, which has a good flow diversion effect on the oil, makes the flow of the oil orderly, ensures the uniformity and stability of the flow rate and flow velocity of the oil in the iron core 2 and the magnetic steel 3, and improves the cooling effect.

[0097] Specifically, the inner wall of the iron core 2 is provided with a flow groove 21, and a first flow hole is formed between the flow groove 21 and the outer wall of the rotating shaft 1. The first flow holes on the multiple iron cores 2 are sequentially connected to form a first flow channel 101. The liquid storage chamber 11 is connected to the first flow channel 101 through the liquid outlet channel 12, and the first flow channel 101 is connected to the second flow channel 102. This arrangement ensures that the oil in the liquid storage chamber 11 inside the rotating shaft 1 can first be stably and reliably transported to the inner wall of the iron core 2, cooling the multiple iron cores 2 from the outside, and then flowing into the second flow channel 102.

[0098] More specifically, the rotor assembly also includes two dynamic balancing plates 4, which are sleeved on the rotating shaft 1. The plurality of iron cores 2 are sandwiched between the two dynamic balancing plates 4. The dynamic balancing plates 4 are provided with a first transition flow channel 201, which connects the first circulation channel 101 to the second circulation channel 102. The provision of the first transition flow channel 201 allows oil to flow smoothly from the first circulation channel 101 to the second circulation channel 102, ensuring uniformity and stability of the oil flow rate and flow velocity in the iron cores 2 and the magnetic steel 3.

[0099] More specifically, the dynamic balancing plate 4 is further provided with a second transition channel 202, through which the second circulation channel 102 connects to the magnetic steel cooling channel. The provision of the second transition channel 202 allows the oil to flow smoothly from the second circulation channel 102 into the magnetic steel cooling channel, further ensuring the uniformity and stability of the oil flow rate and flow velocity in the iron core 2 and magnetic steel 3.

[0100] In this embodiment, the iron core 2 and the dynamic balancing plate 4 are both annular plates, which are coaxially sleeved on the rotating shaft 1. The iron core 2 is formed by stacking multiple rotor punchings, and there are six of them, which are staggered and stacked in the axial direction. There is an interference fit between the iron core 2 and the rotating shaft 1, and there is an interference fit between the dynamic balancing plate 4 and the rotating shaft 1. The magnetic steel 3 is embedded in the mounting hole of the iron core 2. The first transition flow channel 201 extends in an L shape, from the first flow channel 101 to the second flow channel 102. The first transition flow channel 201 first extends in the radial direction of the iron core 2 and then extends in the circumferential direction of the iron core 2. The second transition flow channel 202 is in the shape of an elongated strip and extends in the circumferential direction of the iron core 2.

[0101] Specifically, the two ends of the first circulation channel 101 are respectively connected to the first transition flow channels 201 of the two dynamic balancing plates 4, and each first transition flow channel 201 is connected to a second circulation channel 102, so that the oil flowing out of the liquid outlet channel 12 is split in the first circulation channel 101 and flows in opposite directions, and finally flows into the two second circulation channels 102 through the first transition flow channels 201 of the two dynamic balancing plates 4, and finally makes the flow directions of the oil in the two second circulation channels 102 opposite, thereby improving the uniformity and stability of the flow rate and flow velocity of the oil in the iron core 2, effectively ensuring the dynamic balance of the rotor assembly during the cooling and heat dissipation process, and improving the stability of the rotor assembly operation.

[0102] More specifically, in the axial direction of the rotating shaft 1, the liquid outlet channel 12 is located in the middle of the first transition flow channels 201 of the two dynamic balancing plates 4. The above arrangement further ensures the dynamic balance of the rotor assembly during the cooling and heat dissipation process, and improves the stability of the rotor assembly operation.

[0103] Specifically, a plurality of first circulation channels 101 are provided, each of which is connected to the liquid storage chamber 11 via a liquid outlet channel 12. The two ends of each first circulation channel 101 are connected to a second circulation channel 102 via a first transition channel 201. The liquid storage chamber 11 is located axially of the rotating shaft 1. The plurality of liquid outlet channels 12 are evenly distributed along the circumference of the rotating shaft 1. The plurality of first circulation channels 101 are evenly distributed along the circumference of the rotating shaft 1. The plurality of second circulation channels 102 are evenly distributed along the circumference of the rotating shaft 1. This arrangement ensures dynamic balance of the rotor assembly during rotation, thereby allowing the oil to flow evenly and stably through the iron core 2 and the magnetic steel 3.

[0104] In this embodiment, a liquid inlet channel 13 is provided on the rotating shaft 1. The liquid inlet channel 13 and the liquid storage chamber 11 are arranged coaxially. One end of the liquid inlet channel 13 is connected to the end surface of the rotating shaft 1, and the other end is connected to the liquid storage chamber 11. There are three first circulation channels 101, three liquid outlet channels 12, and six second circulation channels 102. This arrangement ensures a uniform flow rate and flow rate of the oil, with the center angle of adjacent liquid outlet channels 12 being 120° and the center angle of adjacent second circulation channels 102 being 60°.

[0105] In other embodiments, one, two, or more than three first circulation channels 101 may be provided.

[0106] Specifically, mounting holes correspond one to one with the magnets 3, and multiple mounting holes are provided. The sizes of the mounting holes vary, and the sizes of the magnets 3 vary. Each mounting hole and each magnet 3 form a magnet cooling channel. The multiple magnet cooling channels are sequentially connected, with one end of each of the sequentially connected magnet cooling channels connected to the second circulation channel 102 and the other end connected to the outside. This arrangement effectively guides the oil, ensuring orderly oil flow during cooling operations, allowing the oil to sequentially cool magnets 3 of various sizes.

[0107] More specifically, two types of mounting holes are provided: a first mounting hole 23 and a second mounting hole 24. Two types of magnetic steel 3 are provided: a first magnetic steel and a second magnetic steel. The first magnetic steel is installed in the first mounting hole 23. A first magnetic steel cooling hole is formed between the first magnetic steel and the inner wall of the first mounting hole 23. The first magnetic steel cooling holes on multiple cores 2 are sequentially connected to form a magnetic steel cooling channel, which is a third circulation channel 103. The second circulation channel 102 is connected to the third circulation channel 103. The second magnetic steel is installed in the second mounting hole 24. A second magnetic steel cooling hole is formed between the second magnetic steel and the inner wall of the second mounting hole 24. The second magnetic steel cooling holes on multiple cores 2 are sequentially connected to form a magnetic steel cooling channel, which is a fourth circulation channel 104. The third circulation channel 103 is connected to the fourth circulation channel 104, and the fourth circulation channel 104 is connected to the outside. The above arrangement has a good effect on guiding the oil. During the cooling operation, the oil flows in the third circulation channel 103 and the fourth circulation channel 104 in an orderly manner, so that the oil can cool the first magnetic steel and the second magnetic steel in turn.

[0108] In this embodiment, the second circulation channel 102 is connected to the third circulation channel 103 through the second transition channel 202 .

[0109] Specifically, one of the two dynamic balancing plates 4 is provided with a third transition channel 203, and the other is provided with a fourth transition channel 204. The third circulation channel 103 is connected to the fourth circulation channel 104 via the third transition channel 203, and the fourth circulation channel 104 is connected to the outside via the fourth transition channel 204. This arrangement, through the provision of the third transition channel 203 and the fourth transition channel 204, allows oil to flow smoothly from the third circulation channel 103 to the fourth circulation channel 104 and ultimately out of the fourth circulation channel 104.

[0110] More specifically, the third transition channel 203 and the fourth transition channel 204 both extend in the radial direction of the iron core 2 to adapt to the flow trend of the oil during centrifugal motion.

[0111] In this embodiment, for the six second circulation channels 102, three third transition flow channels 203 and three fourth transition flow channels 204 are provided on each dynamic balancing plate 4. The fourth transition flow channels 204 are connected to the outside through the outflow hole. The oil in the three second circulation channels 102 first flows into the three third transition flow channels 203 on the first dynamic balancing plate 4 in a one-to-one correspondence, and then flows into the three fourth transition flow channels 204 on the second dynamic balancing plate 4 in a one-to-one correspondence before flowing out through the outflow hole. The oil in the other three second circulation channels 102 first flows into the three third transition flow channels 203 on the second dynamic balancing plate 4 in a one-to-one correspondence, and then flows into the three fourth transition flow channels 204 on the first dynamic balancing plate 4 in a one-to-one correspondence before flowing out through the outflow hole.

[0112] In other embodiments, the mounting holes and the magnetic steels 3 correspond one to one, and one or more types may be provided respectively.

[0113] Specifically, two third circulation channels 103 form a group, and the second circulation channel 102 is connected to the two third circulation channels 103 in one group. The above arrangement improves the cooling efficiency of the oil on the first magnetic steel.

[0114] More specifically, two fourth circulation channels 104 form a group, and the third circulation channel 103 is connected to the two fourth circulation channels 104 in the group. The above arrangement improves the cooling efficiency of the oil on the second magnetic steel.

[0115] More specifically, if Figure 3 As shown, the distance between the third flow channel 103 and the axis of the core 2 is L1, and the distance between the fourth flow channel 104 and the axis of the core 2 is L2, where L1 is smaller than L2. The above arrangement adapts to the flow trend of the oil during centrifugal motion, making the oil flow smoother and more efficient.

[0116] In this embodiment, each second circulation channel 102 connects to two adjacent third circulation channels 103 via a second transition channel 202. Two adjacent third circulation channels 103 connect to two adjacent fourth circulation channels 104 via a third transition channel 203. Two adjacent fourth circulation channels 104 connect to the outside via a fourth transition channel 204. This arrangement ensures that the oil removes heat from the iron core 2, the first magnetic steel, and the second magnetic steel uniformly and stably, minimizing temperature fluctuations.

[0117] In the rotor assembly of this embodiment, the oil circulation pipeline specifically includes a liquid inlet channel 13, a liquid storage chamber 11, a liquid outlet channel 12, a first circulation channel 101, a first transition flow channel 201, a second circulation channel 102, a second transition flow channel 202, a third circulation channel 103, a third transition flow channel 203, a fourth circulation channel 104 and an outflow hole, which are connected in sequence.

[0118] This embodiment further provides a motor, comprising a housing, a stator assembly and the above-mentioned rotor assembly, wherein the stator assembly is disposed in the housing, and the rotor assembly is disposed through the stator assembly.

[0119] In the motor of this embodiment, by providing a liquid outlet channel 12 on the rotating shaft 1, the oil in the liquid storage chamber 11 inside the rotating shaft 1 can be stably and reliably transported to the second circulation channel 102 in the iron core 2, so that the oil can cool the iron core 2 from the inside. A magnetic steel cooling channel is formed between the iron core 2 and the magnetic steel 3, so that the oil can cool the multiple magnetic steels 3. The liquid storage chamber 11, the liquid outlet channel 12, the second circulation channel 102 and the magnetic steel cooling channel are connected in sequence and finally connected to the outside through the magnetic steel cooling channel, which has a good flow diversion effect on the oil, makes the flow of the oil orderly, ensures the uniformity and stability of the flow rate and flow velocity of the oil in the iron core 2 and the magnetic steel 3, and improves the cooling effect.

[0120] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A rotor assembly, characterized in that: include: A rotating shaft (1), wherein the rotating shaft (1) is provided with a liquid storage cavity (11) and a liquid outlet channel (12) connected to the liquid storage cavity (11); A plurality of iron cores (2) are sleeved on the rotating shaft (1) and arranged side by side in sequence. The iron cores (2) are provided with second circulation holes (22) and mounting holes. The second circulation holes (22) on the plurality of iron cores (2) are connected in sequence to form a second circulation channel (102). The liquid storage chamber (11) is connected to the second circulation channel (102) through the liquid outlet channel (12). A magnetic steel (3) is installed in the installation hole, a magnetic steel cooling hole is formed between the magnetic steel (3) and the inner wall of the installation hole, the magnetic steel cooling holes on the plurality of iron cores (2) are connected in sequence to form a magnetic steel cooling channel, and the second circulation channel (102) is connected to the outside through the magnetic steel cooling channel.

2. The rotor assembly according to claim 1, wherein: The inner wall of the iron core (2) is provided with a circulation groove (21), and a first circulation hole is formed between the circulation groove (21) and the outer wall of the rotating shaft (1). The first circulation holes on the plurality of iron cores (2) are connected in sequence to form a first circulation channel (101), the liquid storage chamber (11) is connected to the first circulation channel (101) through the liquid outlet channel (12), and the first circulation channel (101) is connected to the second circulation channel (102).

3. The rotor assembly according to claim 2, wherein: The invention also includes two dynamic balancing plates (4), the two dynamic balancing plates (4) are sleeved on the rotating shaft (1), the plurality of iron cores (2) are sandwiched between the two dynamic balancing plates (4), the dynamic balancing plates (4) are provided with a first transition flow channel (201), and the first circulation channel (101) is connected to the second circulation channel (102) through the first transition flow channel (201).

4. The rotor assembly according to claim 3, wherein: Both ends of the first circulation channel (101) are respectively connected to the first transition flow channels (201) of the two dynamic balancing plates (4), and each of the first transition flow channels (201) is connected to one of the second circulation channels (102).

5. The rotor assembly according to claim 4, wherein: In the axial direction of the rotating shaft (1), the liquid outlet channel (12) is located at a middle position of the first transition flow channels (201) of the two dynamic balancing plates (4).

6. The rotor assembly according to claim 1, wherein: The mounting holes and the magnetic steels (3) correspond to each other one by one, and are respectively provided with a plurality of types. A corresponding mounting hole and a corresponding magnetic steel (3) form a magnetic steel cooling channel. The plurality of magnetic steel cooling channels are connected in sequence, and one end of the plurality of magnetic steel cooling channels connected in sequence is connected to the second circulation channel (102), and the other end is connected to the outside.

7. The rotor assembly according to claim 6, wherein: There are two types of mounting holes, which are respectively a first mounting hole (23) and a second mounting hole (24); there are two types of magnetic steels (3), which are respectively a first magnetic steel and a second magnetic steel; The first magnetic steel is installed in the first mounting hole (23), a first magnetic steel cooling hole is formed between the first magnetic steel and the inner wall of the first mounting hole (23), the magnetic steel cooling channel formed by sequentially connecting the first magnetic steel cooling holes on the plurality of iron cores (2) is a third circulation channel (103), and the second circulation channel (102) is connected to the third circulation channel (103); The second magnetic steel is installed in the second mounting hole (24), and a second magnetic steel cooling hole is formed between the second magnetic steel and the inner wall of the second mounting hole (24). The magnetic steel cooling channel formed by sequentially connecting the second magnetic steel cooling holes on the plurality of iron cores (2) is a fourth circulation channel (104). The third circulation channel (103) is connected to the fourth circulation channel (104), and the fourth circulation channel (104) is connected to the outside.

8. The rotor assembly according to claim 7, wherein: The two third circulation channels (103) form a group, and the second circulation channel (102) is connected to the two third circulation channels (103) in one group.

9. The rotor assembly according to claim 7, wherein: The two fourth circulation channels (104) form a group, and the third circulation channel (103) is connected to the two fourth circulation channels (104) in the group.

10. The motor is characterized in that It comprises a housing, a stator assembly and the rotor assembly according to any one of claims 1 to 9, wherein the stator assembly is arranged in the housing, and the rotor assembly is passed through the stator assembly.

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