Motor rotor

Abstract

The application relates to a motor rotor, comprising: a rotating shaft, wherein a first oil inlet hole and a second oil inlet hole are arranged on the rotating shaft; a rotor core, wherein a first end face and a second end face are arranged oppositely, and a magnet accommodating hole is arranged on the first end face; a first balance plate, wherein an inner end face of the first balance plate is connected with the second end face of the rotor core, and a first oil channel is arranged on the inner end face of the first balance plate; a second balance plate, wherein an inner end face of the second balance plate is connected with the first end face of the rotor core, and a second oil channel is arranged on the inner end face of the second balance plate; and permanent magnets, wherein the permanent magnets are embedded into the magnet accommodating holes of the rotor core in pairs and form magnetic barrier gaps of the rotor core with the magnet accommodating holes; and the first balance plate, the rotor core and the second balance plate are sequentially arranged on the rotating shaft along the axial direction of the rotating shaft. According to the motor rotor, the cooling liquid can be directly contacted with the permanent magnets, so that the heat dissipation efficiency of the permanent magnets is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an electric machine rotor. BACKGROUND

[0002] Electric machines generate heat during operation, and in order to ensure stable operation of the electric machine, a good cooling method is needed to control the temperature of the electric machine. Traditional electric machine cooling methods include natural cooling, air cooling, water cooling and oil cooling, all of which use cooling medium to carry away heat from the electric machine.

[0003] The rotor in the electric machine also generates heat during operation, and the temperature rise of the rotor can seriously weaken the performance of the permanent magnet in the rotor. If the temperature is too high, the permanent magnet may lose magnetism. Therefore, in high-power-density oil-cooled electric machines, the rotor in the electric machine is usually actively cooled.

[0004] In the prior art, the cooling of the electric machine rotor is achieved by opening an oil channel on the rotor core and the rotating shaft to form a cooling loop, thereby indirectly cooling the permanent magnet by cooling the rotor core. However, the permanent magnet cannot be directly in contact with the cooling liquid, so the cooling effect on the permanent magnet is not good. SUMMARY

[0005] The present application aims to at least partially solve one of the technical problems in the related art.

[0006] To this end, one object of the present application is to provide an electric machine rotor having a cooling oil channel that not only cools the rotor core but also allows the cooling liquid to directly contact the permanent magnet, thereby cooling the permanent magnet.

[0007] The motor rotor according to the embodiment of the present application comprises: a rotating shaft, an outer circumferential surface of the rotating shaft being provided with a first oil inlet hole and a second oil inlet hole; a rotor core, the rotor core comprising oppositely arranged first and second end faces, the first end face being provided with a magnet accommodating hole, the magnet accommodating hole being through the second end face along an axial direction of the rotating shaft; a first balance plate, the first balance plate being connected with the second end face of the rotor core, an inner end face of the first balance plate being provided with a first oil channel, the first oil channel comprising a first radial oil groove and a first circumferential oil groove, the first radial oil groove being in communication with the first oil inlet hole of the rotating shaft; a second balance plate, the second balance plate being connected with the first end face of the rotor core, an inner end face of the second balance plate being provided with a second oil channel, the second oil channel comprising a second radial oil groove and a second circumferential oil groove, the second radial oil groove being in communication with the second oil inlet hole of the rotating shaft; and permanent magnets, the permanent magnets being embedded in the magnet accommodating holes of the rotor core in pairs and forming magnetic barrier gaps of the rotor core with the magnet accommodating holes; the first balance plate, the rotor core and the second balance plate are sequentially sleeved on the rotating shaft along the axial direction of the rotating shaft, and the first circumferential oil groove and the second circumferential oil groove are in communication with the magnetic barrier gaps, respectively.

[0008] In the motor rotor according to the embodiment of the present application, the first oil inlet hole and the second oil inlet hole on the rotating shaft can form a plurality of cooling oil paths with the first radial oil groove and the first circumferential oil groove of the first balance plate, the magnetic barrier gaps of the rotor core and the second radial oil groove and the second circumferential oil groove of the second balance plate, respectively, so that the cooling liquid can directly contact the permanent magnets, thereby achieving cooling of the permanent magnets and improving the cooling efficiency of the permanent magnets.

[0009] In addition, the motor rotor according to the above-mentioned embodiment of the present application can further have the following additional technical features.

[0010] In some embodiments, the magnet accommodating holes are arranged along a circumferential direction of the rotor core, the magnet accommodating holes comprising first and second side holes, the first and second side holes being angularly intersected to form a V shape and being in communication. In this way, the V-shaped magnet accommodating holes can form three gaps with the permanent magnets, so that the cooling liquid can flow through multiple side surfaces of the permanent magnets, thereby improving the cooling efficiency of the permanent magnets.

[0011] In some embodiments, the magnetic barrier gap of the rotor core comprises a first gap, a second gap and a third gap, the end of the first side hole of the magnet receiving hole intersecting with the second side hole forms the second gap, and the two side ends of the first side hole of the magnet receiving hole away from the intersection with the second side hole form the first gap and the third gap with the permanent magnet respectively. Thus, a plurality of circulating cold zone oil paths can be formed with the first oil channel of the first balance plate and the second oil channel of the second balance plate, so that the cooling liquid flows through the two sides of each permanent magnet to cool the permanent magnet, and the temperature inside the rotor core is also reduced.

[0012] In some embodiments, the first circumferential oil groove and the second circumferential oil groove communicate the adjacent first gap and the third gap of the rotor core, part of the first circumferential oil groove communicates the adjacent second gap of the rotor core, and the second radial oil groove communicates the adjacent second gap of the rotor core. Thus, the cooling liquid of the first balance plate can flow through the magnetic barrier gap to the second balance plate, and the cooling liquid of the second balance plate can flow through the magnetic barrier gap to the first balance plate, so that the cooling liquid can directly contact the permanent magnet and be replaced.

[0013] In some embodiments, an oil hole is provided on the first end surface of the rotor core, the oil hole penetrates through the second end surface along the axial direction of the rotating shaft and communicates with the second circumferential oil groove of the second balance plate. Thus, the oil channel of the first balance plate can be communicated with the oil channel of the second balance plate, so that the cooling liquid can flow through all the magnetic barrier gaps to improve the cooling efficiency of the permanent magnet.

[0014] In some embodiments, the number of the first radial oil grooves of the first balance plate and the number of the second radial oil grooves of the second balance plate are equal, and both are 1 / 2 of the number of the magnet receiving holes of the rotor core. Thus, the cooling liquid is divided into two cooling oil paths through the first radial oil grooves and the second radial oil grooves, and then flows into the magnetic barrier gaps of the rotor core to cool all the permanent magnets in the rotor core, so that any permanent magnet is not affected by high temperature to lose magnetism and affect the performance of the motor.

[0015] In some embodiments, a first oil outlet hole is provided on the outer end surface of the first balance plate, the first oil outlet hole partially communicates with the first circumferential oil groove of the first balance plate, and a second oil outlet hole is provided on the outer end surface of the second balance plate, the second oil outlet hole partially communicates with the second circumferential oil groove of the second balance plate. Thus, the heated cooling liquid can be discharged from the magnetic barrier gaps of the rotor core to achieve continuous cooling of the permanent magnet.

[0016] In some embodiments, the first end surface of the rotor core is provided with a plurality of axial through holes, which are arranged around the outer circle of each magnet receiving hole of the rotor core and communicate with the magnet receiving hole. In this way, the contact area of the cooling liquid with the permanent magnet can be increased, thereby improving the heat dissipation efficiency of the permanent magnet.

[0017] In some embodiments, the opposite two side surfaces of the permanent magnet are respectively provided with a groove penetrating through the permanent magnet and communicating with the magnetic barrier gap. In this way, the cooling liquid can enter the axial groove of the permanent magnet, so that the contact area of the cooling liquid with the permanent magnet is increased, thereby improving the heat dissipation efficiency of the permanent magnet.

[0018] In some embodiments, the rotor core comprises a plurality of first laminations and a plurality of second laminations staggered and superimposed along the central axis of the rotating shaft, and the cross-sectional area of the magnet receiving hole on the first lamination is smaller than that of the magnet receiving hole on the second lamination. In this way, when the first lamination and the second lamination are staggered and superimposed, the inner side surface of the magnet receiving hole of the rotor core can form a plurality of oil grooves, which communicate with the magnetic barrier gap, thereby increasing the contact area of the cooling liquid with the permanent magnet and improving the heat dissipation efficiency of the permanent magnet.

[0019] The present application has the advantages that the overall structure of the present application is compact, and the cooling liquid can directly contact the permanent magnet to cool the permanent magnet, thereby reducing the risk of demagnetization of the permanent magnet due to the high temperature inside the motor. BRIEF DESCRIPTION OF DRAWINGS

[0020] Other features and advantages of the present application will be explained in more detail based on embodiments with reference to the accompanying drawings.

[0021] Figure 1 is an exploded view of a motor rotor according to an embodiment of the present application.

[0022] Figure 2 is a sectional view of a motor rotor according to an embodiment of the present application.

[0023] Figure 3 is a perspective structural schematic view of a rotating shaft according to an embodiment of the present application.

[0024] Figure 4 is a front view of a rotor core according to an embodiment of the present application.

[0025] Figure 5 is a perspective structural schematic view of a permanent magnet according to an embodiment of the present application.

[0026] Figure 6 is a front view of a rotor core (including a permanent magnet) according to an embodiment of the present application.

[0027] Figure 7is a structural schematic view of the inner end surface of the left balance plate according to Embodiment One of the present application.

[0028] Figure 8 is a three-dimensional structural schematic view of the left balance plate according to Embodiment One of the present application.

[0029] Figure 9 is a structural schematic view of the inner end surface of the right balance plate according to Embodiment One of the present application.

[0030] Figure 10 is Figure 2 is a projection view in the A direction (omitting the right balance plate).

[0031] Figure 11 is Figure 2 is a projection view in the B direction (omitting the left balance plate).

[0032] Figure 12 is a sectional view of the motor rotor according to Embodiment Two of the present application.

[0033] Figure 13 is an exploded view of the motor rotor according to Embodiment Two of the present application.

[0034] Figure 14 is a front view of the rotor core (including permanent magnets) according to Embodiment Two of the present application.

[0035] Figure 15 is Figure 14 is a partial enlarged view of the C portion in the above.

[0036] Figure 16 is a three-dimensional structural schematic view of the permanent magnet according to Embodiment Two of the present application.

[0037] Figure 17 is a structural schematic view of the inner end surface of the left balance plate according to Embodiment Two of the present application.

[0038] Figure 18 is a structural schematic view of the inner end surface of the right balance plate according to Embodiment Two of the present application.

[0039] Figure 19 is Figure 12 is a projection view in the D direction.

[0040] Figure 20 is a sectional view of the motor rotor according to Embodiment Three of the present application.

[0041] Figure 21 is a three-dimensional structural schematic view of the rotor core according to Embodiment Three of the present application,

[0042] Figure 22 is a structural schematic view of the first punching sheet of the rotor core according to Embodiment Three of the present application.

[0043] Figure 23 is a structural schematic diagram of a second lamination of a rotor core according to Embodiment Three of the present application.

[0044] Figure 24 is a front view of a rotor core according to Embodiment Three of the present application.

[0045] Figure 25 is a three-dimensional structural schematic diagram of a permanent magnet according to Embodiment Three of the present application.

[0046] Figure 26 is a front view of a left (right) balance plate according to Embodiment Three of the present application.

[0047] Figure 27 Figure 20 is a projection view in the E direction. BRIEF DESCRIPTION OF DRAWINGS

[0049] rotating shaft 1, counterbore 11, right end surface of rotating shaft 12, first oil inlet hole 13, second oil inlet hole 14, shaft shoulder 15, outer peripheral surface of rotating shaft 16;

[0050] rotor core 2, first end surface 21, second end surface 22, through hole 23, magnet accommodating hole 24, first side hole 241, second side hole 242, first inner side surface 243, second inner side surface 242, side edge 244, magnetic barrier gap 25, first gap 251, second gap 252, third gap 253;

[0051] permanent magnet 3, first side surface 31, second side surface 32, third side surface 33, side edge 34;

[0052] first balance plate 4, right end surface of first balance plate 41, left end surface of first balance plate 42, through hole 43, first radial oil groove 44, first circumferential oil groove 45, first oil outlet hole 46;

[0053] second balance plate 5, right end surface of second balance plate 51, left end surface of second balance plate 52, through hole 53, second radial oil groove 54, second circumferential oil groove 55, second oil outlet hole 56;

[0054] Embodiment One:

[0055] oil hole 26;

[0056] T-shaped oil groove 451, I-shaped oil groove 452;

[0057] T-shaped oil groove 551, T-shaped oil groove 552;

[0058] Embodiment Two:

[0059] axial through hole 27;

[0060] groove 35;

[0061] Example 3:

[0062] First lamination 28, V-shaped hole 281; Second lamination 29, V-shaped hole 291;

[0063] 30 transverse oil passages;

[0064] Groove 36;

[0065] Vertex angle M; base angle N. Detailed Implementation

[0066] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It should be noted that the terms "upper," "lower," "left," "right," "front," "rear," and similar expressions used herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. The arrows in the accompanying drawings indicate the direction of coolant flow in the cooling oil passages.

[0068] Example 1

[0069] like Figure 1 As shown, the motor rotor according to an embodiment of the present invention includes a rotating shaft 1, a rotor core 2, a permanent magnet 3, a left balance plate 4 (as an example of a first balance plate) and a right balance plate 5 (as an example of a second balance plate). The rotor core 2 includes a right end face 21 (as an example of a first end face) and a left end face 22 (as an example of a second end face) disposed opposite to each other. The left balance plate 4, the rotor core 2 and the right balance plate 5 are sequentially sleeved on the rotating shaft 1 along the axial direction of the rotating shaft 1. The right end face 41 of the left balance plate is connected to the left end face 22 of the rotor core, and the left end face 52 of the right balance plate is connected to the right end face 21 of the rotor core. The connection surface between the left balance plate 4 and the rotor core 2 is the inner end face of the left balance plate 4, and the connection surface between the right balance plate 5 and the rotor core 2 is the inner end face of the right balance plate 5.

[0070] Shaft 1, such as Figure 2 and Figure 3As shown, the shaft 1 is provided with a counterbore 11, which is arranged in the center of the right end surface 12 of the shaft 1 along the axial direction of the shaft 1, and is the inner cavity of the shaft 1 for injecting cooling liquid; the outer circumferential surface 16 of the shaft 1 is provided with a first oil inlet hole 13 and a second oil inlet hole 14 which are spaced apart along the circumferential direction of the shaft 1, the first oil inlet hole 13 is arranged at the left end of the shaft 1, and the second oil inlet hole 14 is arranged at the right end of the shaft 1, the first oil inlet hole 13 and the second oil inlet hole 14 are arranged at equal angular intervals along the circumferential direction of the shaft 1, and are in communication with the counterbore 11 of the shaft 1.

[0071] The rotor core 2 is as shown in the figure, Figure 4 As shown, the rotor core 2 is provided with a through hole 23 in the center, and the right end surface 21 of the rotor core 2 is provided with a magnet receiving hole 24, which is arranged at equal angular intervals on the right end surface 21 of the rotor core 2 along the circumferential direction of the rotor core 2 and penetrates through the left end surface 22 along the axial direction of the shaft 1; the magnet receiving hole 24 includes a first side hole 241 and a second side hole 242, the first side hole 241 and the second side hole 242 are angularly intersected to form a V shape and are in communication, and the first side hole 241 and the second side hole 242 each have two opposite and parallel first inner sides 243 and second inner sides 244.

[0072] Optionally, the rotor core 2 is also provided with an oil hole 26, which is arranged at equal angular intervals on the right end surface 21 of the rotor core 2 along the circumferential direction of the rotor core 2 and penetrates through the left end surface 22 of the rotor core 2 along the axial direction of the shaft 1. The oil hole 26 does not interfere with the magnet receiving hole 24, and there is one oil hole 26 between each pair of magnet receiving holes 24, that is, the number of oil holes 26 arranged on the rotor core 2 is half the number of magnet receiving holes 24.

[0073] The permanent magnet 3 is a magnet that can maintain its magnetism for a long time. As shown in the figure, Figure 5 and Figure 6As shown, permanent magnets 3 are embedded in pairs within the magnet receiving holes 24 of the rotor core 2, forming magnetic barrier gaps 25 in the rotor core. The permanent magnets 3 are cuboids with two opposing first side surfaces 31, second side surfaces 32, and third side surfaces 33. The two first side surfaces 31 of the permanent magnets 3 contact the first inner side surface 243 and the second inner side surface of the magnet receiving hole 24, respectively. The second side surfaces 32 of the two permanent magnets 3 within each magnet receiving hole 24 on the rotor core 2 divide the magnet receiving hole 24 into multiple magnetic barrier gaps 25. Each magnetic barrier gap 25 includes a first gap 251, a second gap 252, and a third gap 253. The end where the first side hole 241 and the second side hole 242 of the magnet receiving hole 24 intersect forms the second gap 252. The two side ends of the first side hole 241 and the second side hole 242 of the magnet receiving hole 24, away from the intersection, respectively form the first gap 251 and the third gap 253 with the second side surface 32 of the permanent magnets 3. This allows multiple circulating cold zone oil paths to be formed, enabling coolant to flow through the second side 32 of each permanent magnet 3, thereby cooling the permanent magnet.

[0074] The first gap 251, the second gap 252, and the third gap 253 are inherent magnetic barrier gaps on both sides of the permanent magnet 3 on the rotor core 2. Using these inherent magnetic barrier gaps as cooling oil channels can simplify the manufacturing process and save costs.

[0075] Left balance plate 4, as Figure 7 and Figure 8 As shown, the left balance plate 4 has a through hole 43 at its center; the left balance plate 4 also has a first oil passage opened along the axial direction of the rotating shaft 1. The first oil passage is opened on the right end face 41 of the left balance plate and includes a first radial oil groove 44 and a first circumferential oil groove 45. The first radial oil groove 44 is opened radially on the left balance plate 4 and is arranged at equal angles along the circumference of the left balance plate 4. The cross-section of the first radial oil groove 44 is rectangular; the first circumferential oil groove 45 is arranged at equal angles along the circumference of the left balance plate 4 and does not interfere with the first radial oil groove 44. The first radial oil groove 44 communicates with the central through hole 43 of the left balance plate 4 and is also connected to the first oil inlet hole 13 at the left end of the rotating shaft 1. That is, the number of first radial oil grooves 44 on the left balance plate 4 is equal to the number of first oil inlet holes 13 on the rotating shaft 1.

[0076] Optionally, the first circumferential oil groove 45 includes a T-shaped oil groove 451 and an I-shaped oil groove 452, which are arranged alternately at equal angular intervals along the circumference of the left balance plate 4. The T-shaped oil groove 451 includes two elongated oil grooves that intersect and are interconnected; the I-shaped oil groove 452 includes three elongated oil grooves, two of which are arranged approximately parallel to each other, and the third elongated oil groove intersects with them respectively, thereby making the three elongated oil grooves interconnected.

[0077] Optionally, such asFigure 10 As shown in the figure, the T-shaped oil groove 451 connects the first gap 251 and the third gap 253 of the magnetic barrier gap 25 in the adjacent magnet accommodating hole 24, the top end of the I-shaped oil groove 452 on the outer circumferential surface of the left balance plate 4 connects the first gap 251 and the third gap 253 of the magnetic barrier gap 25 in the adjacent magnet accommodating hole 24, and the bottom end of the I-shaped oil groove 452 connects the second gap 252 of the magnetic barrier gap 25 in the adjacent magnet accommodating hole 24.

[0078] Optionally, as shown in the figure, Figure 2 The left balance plate 4 is also provided with first oil outlet holes 46, which are arranged on the left end surface 42 of the left balance plate 4 at equal angular intervals along the circumference of the left balance plate 4. Figure 10 As shown in the figure, the first oil outlet holes 46 of the left balance plate 4 are respectively connected to the T-shaped oil grooves 451 of the left balance plate 4, that is, the number of the first oil outlet holes 46 of the left balance plate is equal to the number of the T-shaped oil grooves 451.

[0079] Optionally, as shown in the figure, Figure 7 The number of the first radial oil grooves 44, the T-shaped oil grooves 451 and the I-shaped oil grooves 452 of the left balance plate 4 is equal to half the number of the magnet accommodating holes 24; the center axis of the first radial oil groove 44 of the left balance plate 4 is collinear with the center axis of the T-shaped oil groove 451, and both are in the same radial direction of the left balance plate 4.

[0080] The right balance plate 5, as shown in the figure, Figure 2 And Figure 9 The center of the right balance plate 5 is provided with a through hole 53, and the left end surface 52 of the right balance plate is provided with a second oil channel in the axial direction of the right balance plate 5, which includes a second radial oil groove 54 and a second circumferential oil groove 55. The second radial oil groove 54 is arranged at equal angular intervals along the circumference of the right balance plate 5 in the radial direction of the right balance plate 5, and the cross section of the second radial oil groove is T-shaped; the second circumferential oil groove 55 is arranged at equal angular intervals along the circumference of the right balance plate 5 and does not interfere with the second radial oil groove 54. The second radial oil groove 54 is connected to the center through hole 53 of the right balance plate 5, and is respectively connected to the second oil inlet hole 14 at the right end of the shaft 1, that is, the number of the second radial oil groove 54 of the right balance plate 5 is equal to the number of the second oil inlet hole 14 of the shaft 1.

[0081] Optionally, as shown in the figure, Figure 11 The top end of the second radial oil groove 54 connects the second gap 252 of the magnetic barrier gap 25 in the adjacent magnet accommodating hole 24;

[0082] Optionally, as shown in the figure, Figure 9 And Figure 11As shown, the second circumferential oil groove 55 of the right balance plate 5 comprises a T-shaped oil groove 551 and a T-shaped oil groove 552, which are staggered along the circumference of the right balance plate 5 at equal angular intervals and do not interfere with each other. The top end of the T-shaped oil groove 551 and the top end of the T-shaped oil groove 552 respectively communicate the first gap 251 and the third gap 253 of the magnetic barrier gap 25 in the adjacent magnet accommodating hole 24.

[0083] Optionally, as shown in Figure 2 and Figure 11 As shown, the right balance plate 5 is also provided with a second oil outlet hole 56, which is formed on the right end surface 51 of the right balance plate and arranged at equal angular intervals along the circumference of the right balance plate 5. The second oil outlet hole 56 on the right balance plate 5 respectively communicates with the T-shaped oil groove 551 of the second circumferential oil groove 55, that is, the number of oil outlet holes 56 on the right balance plate is equal to the number of T-shaped oil grooves 551.

[0084] Optionally, as shown in Figure 9 The number of the second radial oil groove 54, the T-shaped oil groove 551 and the T-shaped oil groove 552 of the right balance plate 5 is equal, which is 1 / 2 of the number of the magnet accommodating hole 24; the center axis of the second radial oil groove 54 and the center axis of the T-shaped oil groove 551 are collinear, and both are in the same radial direction of the right balance plate 5.

[0085] As shown in Figure 1 The outer circumferential surface 16 of the shaft 1 is in transition fit or interference fit with the center through hole 43 of the left balance plate 4, the center through hole 23 of the rotor core 2 and the center through hole 53 of the right balance plate 5, so as to prevent the axial movement of the left balance plate 4, the rotor core 2 and the right balance plate 5 on the shaft 1. The left end of the shaft 1 is provided with a shaft shoulder 15, the right end surface of the shaft shoulder 15 is in contact with the left end surface 42 of the left balance plate, and the shaft shoulder 15 is used for axial positioning of the left balance plate 4.

[0086] Optionally, as shown in Figure 2 and Figure 10 The cooling liquid in the inner cavity of the shaft 1 flows into the first radial oil groove 44 of the left balance plate 4 from the first oil inlet hole 13 at the left end of the shaft 1, then flows into the T-shaped oil groove 552 of the right balance plate 5 through the oil hole 26 of the rotor core 2, the top end of the T-shaped oil groove 552 disperses the cooling liquid into the first gap 251 and the third gap 253 of the magnetic barrier gap 25 of the adjacent magnet accommodating hole 24, then flows into the T-shaped oil groove 451 of the left balance plate 4 through the first gap 251 and the third gap 253, and flows out from the oil outlet hole 46 of the left balance plate 4 which communicates with the T-shaped oil groove 451, thereby forming a complete first cooling oil circuit, and the number of the first cooling oil circuit is 1 / 2 of the number of the magnet accommodating hole 24. In this way, the cooling liquid can directly contact with the permanent magnet 3, which greatly improves the heat dissipation efficiency of the permanent magnet 3.

[0087] Optionally, asFigure 2 and Figure 11 As shown, the coolant inside the shaft 1 flows into the second radial oil groove 54 of the right balance plate 5 from the second oil inlet 14 at the right end of the shaft 1. The top of the second radial oil groove 54 disperses the coolant into the second gap 252 of the magnetic barrier gap 25 of the adjacent magnet receiving hole 24, and then flows into the I-shaped oil groove 452 of the left balance plate 4 through the second gap 252. After flowing from the bottom end to the top end of the I-shaped oil groove 452 of the left balance plate 4, the coolant is then dispersed into the second gap 252 of the magnetic barrier gap 25 of the adjacent magnet receiving hole 24. The coolant is dispersed into the first gap 251 and the third gap 253 of the magnetic barrier gap 25 of the adjacent magnet receiving hole 24, and then flows back to the right balance plate 5 through the first gap 251 and the third gap 253 into the T-shaped oil groove 551 of the second circumferential oil groove 55 of the right balance plate 5, and flows out from the oil outlet 56 of the right balance plate 5 that communicates with the T-shaped oil groove 551, thus forming a complete second cooling oil path. The number of second cooling oil paths is 1 / 2 of the number of magnet receiving holes 24. As a result, the coolant can directly contact the permanent magnet 3, which greatly improves the heat dissipation efficiency of the permanent magnet 3.

[0088] Optionally, such as Figure 10 As shown, the rotor core 2 is provided with 10 magnet receiving holes 24, namely the first oil inlet hole 13 of the shaft 1, the first radial oil groove 44 of the left balance plate 4, the oil hole 26 of the rotor core 2, the T-shaped oil groove 552 of the right balance plate 5, the T-shaped oil groove 451 of the left balance plate 4, and the oil outlet hole 46 of the left balance plate 4, which can form five complete first cooling oil channels with the inherent magnetic barrier gap 25 on the core 2. Figure 11 As shown, the rotor core 2 is provided with 10 magnet receiving holes 24, namely the second oil inlet 14 of the shaft 1, the second radial oil groove 54 of the right balance plate 5, the I-shaped oil groove 452 of the left balance plate 4, the T-shaped oil groove 551 of the right balance plate 5, and the oil outlet 56 of the right balance plate 5, which together with the inherent magnetic barrier gaps 25 on the core 2 form five complete second cooling oil paths. The coolant of the first and second cooling oil paths can flow through all the magnetic barrier gaps on the rotor core 2, that is, the first and second cooling oil paths can cool all the permanent magnets 3 in the rotor core 2, reducing the risk of any permanent magnet 3 in the rotor core 2 losing magnetism due to high temperature.

[0089] The following is for reference. Figures 1 to 11 The motor rotor according to Embodiment 1 of the present invention is described.

[0090] like Figure 1 As shown, the motor rotor includes a rotating shaft 1, a rotor core 2, a permanent magnet 3, a left balance plate 4, and a right balance plate 5. The left balance plate 4, the rotor core 2, and the right balance plate 5 are sequentially sleeved on the rotating shaft 1 along the axial direction of the rotating shaft 1. The right end face 41 of the left balance plate is connected to the left end face 22 of the rotor core, and the left end face 52 of the right balance plate is connected to the right end face 21 of the rotor core.

[0091] When the motor rotor is running, the coolant in the inner cavity of the shaft 1 flows into the first radial oil groove 44 of the left balance plate 4 and the second radial oil groove 54 of the right balance plate 5 through the first oil inlet 13 at the left end and the second oil inlet 13 at the right end of the shaft 1, respectively. The coolant in the first radial oil groove 44 of the left balance plate 4 flows into the magnetic barrier gap 25 at both ends of the rotor core 2 through the oil hole 26 of the rotor core and the T-shaped oil groove 552 of the right balance plate 5, thereby achieving direct contact between the coolant and the permanent magnet. The coolant then flows back to the left balance plate through the magnetic barrier gap 25 of the rotor core 2. The T-shaped oil groove 451 of the left balance plate 4 flows out from the oil outlet 46 of the left balance plate 4; the coolant in the second radial oil groove 54 of the right balance plate 5 flows into the I-shaped oil groove 452 of the left balance plate 4 through the second gap 252 of the magnetic barrier gap 25 of the rotor core 2, and then flows into the magnetic barrier gaps at both ends of the rotor core 2 through the I-shaped oil groove 452, thereby achieving direct contact between the coolant and the permanent magnet. The coolant then flows back to the T-shaped oil groove 551 of the second circumferential oil groove 55 of the right balance plate 5 through the magnetic barrier gap and flows out from the oil outlet 56 of the right balance plate 5. Thus, the coolant can directly contact the permanent magnet 3, thereby achieving cooling of the permanent magnet.

[0092] Example 2

[0093] like Figure 12 and Figure 14 As shown, the first end face 21 of the rotor core 2 is provided with multiple axial through holes 27. The axial through holes 27 are arranged around the outer ring of the magnet receiving hole 24 and communicate with the magnet receiving hole 24. The intersection of the axial through holes 27 and the magnet receiving hole 24 can form multiple heat dissipation channels on the first inner surface 243 and the second inner surface 244 of the magnet receiving hole 24. This increases the contact area between the permanent magnet and the coolant, thereby improving the heat dissipation efficiency of the permanent magnet.

[0094] like Figure 14 and Figure 16 As shown, the permanent magnet 3 has grooves 35 penetrating its two opposite sides and communicating with the magnetic barrier gap 25. Grooves 35 are also provided on the two second sides 32 opposite to the magnetic barrier gap 25 of the rotor core 2. These grooves 35 are axial grooves, extending along the axial direction of the rotor core 2 and penetrating the two third sides 33 of the permanent magnet 3. That is, the axial length of the axial grooves 35 along the axial direction of the rotor core 2 is equal to the length of the side edge 34 of the permanent magnet 3. The axial grooves 35 added to the permanent magnet 3 communicate with the magnetic barrier gap 25 on the rotor core 2, allowing coolant in the magnetic barrier gap 25 to flow into the interior of the permanent magnet 3, thereby increasing the contact area between the coolant and the permanent magnet 3 and significantly improving the heat dissipation efficiency of the permanent magnet.

[0095] like Figure 12 and 17As shown in the figure, the first radial oil groove 44 of the left balance plate 4 is a Y-shaped cross-section oil groove, and the first circumferential oil groove 45 is a V-shaped cross-section oil groove. The first radial oil groove 44 and the first circumferential oil groove 45 are arranged on the right end surface 41 of the left balance plate 4 at equal angular intervals along the circumferential direction of the left balance plate 4. Between any two adjacent first radial oil grooves 44, there is a first circumferential oil groove 45. The first radial oil groove 44 includes a long strip-shaped oil groove and a V-shaped oil groove gradually expanding towards the radial outside. The long strip-shaped oil groove and the V-shaped oil groove intersect to form a Y-shaped cross-section and are in communication with each other. The middle long strip-shaped oil groove of the first radial oil groove 44 is in communication with the central through hole 43 of the left balance plate 4, and is in communication with the first oil inlet hole 13 at the left end of the rotating shaft 1, respectively. The first circumferential oil groove 45 is in communication with the oil outlet hole 46 on the left end surface 42 of the left balance plate, and is used for discharging the cooling liquid.

[0096] As shown in the figure, Figure 12 and 18 As shown in the figure, the oil channel of the right balance plate 5 includes a second radial oil groove 54 and a second circumferential oil groove 55. The second radial oil groove 54 is a Y-shaped cross-section oil groove, and the second circumferential oil groove 55 is a V-shaped cross-section oil groove. The second radial oil groove 54 and the second circumferential oil groove 55 are arranged on the left end surface 52 of the right balance plate 5 at equal angular intervals along the circumferential direction of the right balance plate 5. Between any two adjacent second radial oil grooves 54, there is a second circumferential oil groove 55. The second radial oil groove 54 is in communication with the central through hole 53 of the right balance plate 5, and is in communication with the second oil inlet hole 14 at the right end of the rotating shaft 1, respectively. The second circumferential oil groove 55 is in communication with the oil outlet hole 56 on the right end surface 51 of the right balance plate, and is used for discharging the cooling liquid.

[0097] Optionally, the left balance plate 4 and the right balance plate 5 are the same balance plate. When the left balance plate 4 and the right balance plate 5 are installed on the rotating shaft 1, the left balance plate 4 and the right balance plate 5 need to be installed at a certain angle along the axial direction of the rotating shaft 1, so that the first radial oil groove 44 of the left balance plate 4 is opposite to the second circumferential oil groove 55 of the right balance plate 5, and the first circumferential oil groove 45 of the left balance plate 4 is opposite to the second radial oil groove 54 of the right balance plate 5.

[0098] As shown in the figure, Figure 19 The first radial oil groove 44 and the first circumferential oil groove 54 of the left balance plate 4 are in communication with the axial through hole 27 and the magnetic barrier gap 25 of the rotor core 2, and the second radial oil groove 54 and the second circumferential oil groove 55 of the right balance plate 5 are also in communication with the axial through hole 27 and the magnetic barrier gap 25 of the rotor core 2. Therefore, the cooling liquid can flow into the magnetic barrier gap 25, the axial through hole 27 and the axial recess 35 on the permanent magnet 3 which is in communication with the magnetic barrier gap 25, so as to achieve the cooling of the permanent magnet 3.

[0099] The motor rotor according to the second embodiment of the present application is described below with reference to Figures 12 to 19

[0100] As​Figure 12 As shown, when the rotating shaft 1 rotates, the cooling liquid in the counterbore 11 of the rotating shaft 1 flows into the first radial oil groove 44 of the left balance plate 4 and the second radial oil groove 54 of the right balance plate under the action of centrifugal force through the first oil inlet hole 13 and the second oil inlet hole 14 of the rotating shaft 1 respectively. The cooling liquid in the first radial oil groove 44 of the left balance plate 4 flows into the second circumferential oil groove 55 of the right balance plate 5 through the magnetic barrier gap 25 and the axial through hole 27 on the rotor core 2, and then flows through the groove 35 on the permanent magnet 3 communicating with the magnetic barrier gap 25, and then flows out from the oil outlet hole 56 on the right balance plate 5, thereby forming a complete first cooling oil path, and the number of the first cooling oil path is 1 / 2 of the number of the magnet receiving hole 24. Similarly, the cooling liquid in the second radial oil groove 54 of the right balance plate 5 flows into the first circumferential oil groove 45 of the left balance plate 4 through the magnetic barrier gap 25 and the axial through hole 27 on the rotor core 2, and then flows through the groove 35 on the permanent magnet 3 communicating with the magnetic barrier gap 25, and then flows out from the oil outlet hole 46 on the left balance plate 4, thereby forming a complete second cooling oil path, and the number of the second cooling oil path is 1 / 2 of the number of the magnet receiving hole 24. Thus, the cooling of all the permanent magnets 3 in the rotor core 2 can be realized, so as to reduce the risk of demagnetization of the permanent magnets 3 due to high temperature.

[0101] In some embodiments, as shown in Figure 12 and Figure 19 As shown, ten magnet receiving holes 24 are arranged on the rotor core 2, i.e., the first oil inlet hole 13 of the rotating shaft 1, the first radial oil groove 44 of the left balance plate 4, the second circumferential oil groove 55 of the right balance plate 5, and the oil outlet hole 56 of the right balance plate 5 can form five complete first cooling oil paths with the inherent magnetic barrier gap 25 on the rotor core 2; the second oil inlet hole 14 of the rotating shaft 1, the second radial oil groove 54 of the right balance plate 5, the first circumferential oil groove 45 of the left balance plate 4, and the oil outlet hole 46 of the left balance plate 4 can form five complete second cooling oil paths with the inherent magnetic barrier gap 25 on the rotor core 2. The cooling liquid of the first cooling oil path and the second cooling oil path can flow through all the magnetic barrier gaps 25 on the rotor core 2, and the magnetic barrier gaps 25 communicate with the axial through hole 27 and the groove 35 on the permanent magnet 3, thereby increasing the contact area between the permanent magnet 3 and the cooling liquid, so as to improve the heat dissipation efficiency of the permanent magnet 3.

[0102] Example Three:

[0103] In some embodiments, as shown in Figure 21As shown, the rotor core 2 comprises a plurality of first and second laminations 28 and 29 staggered and stacked along the central axis of the rotor core, the first and second laminations 28 and 29 have equal inner and outer diameters, the end face of the first lamination 28 is arranged with a plurality of magnet accommodating holes 281 at equal angular intervals along the circumference of the rotor core 2, the end face of the second lamination 29 is arranged with a plurality of magnet accommodating holes 291 at equal angular intervals along the circumference of the rotor core 2, the cross section of the magnet accommodating holes 281 and 291 is V-shaped and the cross-sectional area of the magnet accommodating holes 281 of the first lamination is smaller than that of the magnet accommodating holes 291 of the second lamination; the positions of the magnet accommodating holes 281 of the first lamination 28 and the magnet accommodating holes 291 of the adjacent second lamination 29 correspond respectively, thereby forming the magnet accommodating holes 24 of the rotor core 2.

[0104] Optionally, as shown in Figure 21 and Figure 24 , when the first and second laminations 28 and 29 are staggered and stacked along the central axis of the rotor core 2, the two outermost corners M of the magnet accommodating holes 281 of the first lamination coincide with the two outermost corners M of the magnet accommodating holes 291 of the second lamination, and the bottom corner N of the magnet accommodating holes 281 of the first lamination coincides with the bottom corner N of the magnet accommodating holes 291 of the second lamination, but since the shortest distance between the two parallel sides of the magnet accommodating holes 281 of the first lamination is smaller than that of the magnet accommodating holes 291 of the second lamination, i.e. the cross-sectional area of the magnet accommodating holes 281 of the first lamination is smaller than that of the magnet accommodating holes 291 of the second lamination, when the first and second laminations 28 and 29 are staggered and stacked along the central axis of the rotor core 2, the magnet accommodating holes 281 of the first lamination 28 and the magnet accommodating holes 291 of the adjacent second lamination 29 will form a plurality of transverse oil grooves 30 on the first and second inner side surfaces 243 and 244 of each magnet accommodating hole 24, respectively, the transverse oil grooves 30 are arranged at equal intervals on the first and second inner side surfaces 243 and 244 of the magnet accommodating hole 24 along the axial direction of the rotor core 2. Thus, the contact area between the cooling liquid and the permanent magnet 3 can be increased, and the heat dissipation efficiency of the permanent magnet 3 can be improved.

[0105] In some embodiments, as shown in Figure 25 , a plurality of grooves 36 are symmetrically arranged on the two second side surfaces 32 of the permanent magnet 3 opposite to the magnetic barrier gap 25, the grooves 36 are perpendicular to the second side surface 32 and are arranged in an array at equal intervals in a direction parallel to the side edge 34, i.e. the grooves 36 are arranged at equal intervals on the second side surface 32 along the axial direction of the rotor shaft 1, the grooves 36 on the two second side surfaces 32 do not interfere with each other and penetrate through the two first side surfaces 31 of the permanent magnet 3 in a direction perpendicular to the first side surface 31 of the permanent magnet 3. Thus, the transverse grooves 36 of the permanent magnet 3 communicate with the magnetic barrier gap 25, which can increase the contact area between the permanent magnet 3 and the cooling liquid and improve the heat dissipation efficiency of the permanent magnet.

[0106] Optionally, the laminations at both ends of the rotor core 2 are first laminations 28, and the rotor core 2 comprises at least two first laminations 28 and at least one second lamination 29, whereby a transverse oil groove 30 can be formed on the inner side of the magnet accommodating hole 24 to increase the contact area of the permanent magnet 3 with the cooling liquid.

[0107] Optionally, the grooves 36 of the permanent magnet 3 and the transverse oil grooves 30 on the side surface 241 of the magnet accommodating hole 24 of the rotor core 2 are different in axial position along the rotation axis 1, whereby the cooling liquid can flow through different sections of the permanent magnet along the rotation axis 1 in a staggered manner, thereby increasing the contact area of the cooling liquid with the permanent magnet.

[0108] In some embodiments, as shown in Figure 26 the first radial oil groove 44 of the left balance plate 4 comprises a long strip-shaped oil groove opened in the radial direction of the left balance plate 4 and a circular oil groove opened at one end of the long strip-shaped oil groove away from the center of the left balance plate 4, and the long strip-shaped oil groove and the circular oil groove intersect to form a through-shaped oil groove; the first circumferential oil groove 45 is a T-shaped oil groove in cross section, which comprises a longitudinal oil groove opened in the radial direction of the left balance plate 4 and a transverse oil groove opened perpendicular to the radial direction, and the longitudinal oil groove and the transverse oil groove are perpendicular to each other and communicate with each other.

[0109] Optionally, as shown in Figure 27 the angles at both ends of the transverse oil groove of the first circumferential oil groove 45 of the left balance plate 4 coincide with the two outermost corners M of the magnet accommodating hole 281 of the first lamination 28 of the rotor core 2, i.e. also coincide with the two outermost corners M of the magnet accommodating hole 291 of the second lamination 29. The two outermost corners M correspond to the first gap 251 and the third gap 253 of the magnetic barrier gap 25 of the rotor core 2, respectively. Thus, the two ends of the transverse oil groove 30 on the side surface 241 of the magnet accommodating hole 24 communicate with the first gap 251 and the third gap 253 of the magnetic barrier gap 25, respectively, i.e. the cooling liquid in the magnetic barrier gap 25 can flow into the transverse oil groove 30, thereby increasing the contact area of the cooling liquid with the permanent magnet.

[0110] In some embodiments, as shown in Figure 26 and 27 the left balance plate 4 and the right balance plate 5 are the same balance plate, i.e. the second radial oil groove 54 of the right balance plate 5 is the same as the first radial oil groove 44 of the left balance plate 4, and the second circumferential oil groove 55 of the right balance plate 5 is the same as the first circumferential oil groove 45 of the left balance plate 4. When the left balance plate 4 and the right balance plate 5 are installed on the rotation axis 1, the left balance plate 4 and the right balance plate 5 need to be installed at a certain angle along the axial direction of the rotation axis 1 so that the first radial oil groove 44 of the left balance plate 4 is opposite to the second circumferential oil groove 55 of the right balance plate 5, and the first circumferential oil groove 45 of the left balance plate 4 is opposite to the second radial oil groove 54 of the right balance plate 5.

[0111] AsFigure 26 and 27 As shown, the first radial oil groove 44 of the left balance plate communicates with the central through hole 43 of the left balance plate 4, and is also connected to the first oil inlet hole 13 at the left end of the shaft 1; the first circumferential oil groove 45 of the left balance plate communicates with the oil outlet hole 46 on the left end face 42 of the left balance plate, for discharging coolant. Similarly, the second radial oil groove 54 of the right balance plate is the same as the central through hole 53 of the right balance plate, and is also connected to the second oil inlet hole 14 at the right end of the shaft 1; the second circumferential oil groove 55 of the right balance plate communicates with the oil outlet hole 56 on the right end face 51 of the right balance plate.

[0112] like Figure 27 As shown, the circular oil grooves of the first radial oil groove 44 of the left balance plate 4 and the circular oil grooves of the second radial oil groove 54 of the right balance plate 5 are respectively connected to the second gap 252 of the magnetic barrier gap 25 of the rotor core 2. The first circumferential oil groove 45 of the left balance plate 4 and the second circumferential oil groove 55 of the right balance plate 5 connect the first gap 251 and the third gap 253 of the magnetic barrier gap 25 of the rotor core 2. Thus, coolant can flow into the magnetic barrier gap 25, and then into the transverse oil groove 30 on the side 241 of the magnet receiving hole 24 and the transverse groove 36 on the second side 32 of the permanent magnet 3, so as to achieve cooling of the permanent magnet 3.

[0113] In some embodiments, such as Figure 21 As shown, the rotor core 2 is provided with 10 magnet receiving holes 24, namely, the first oil inlet hole 13 of the shaft 1, the first radial oil groove 44 of the left balance plate 4, the second circumferential oil groove 55 of the right balance plate 5, and the oil outlet hole 56 of the right balance plate 5, which can form five complete first cooling oil paths with the inherent magnetic barrier gaps 25 on the rotor core 2; the second oil inlet hole 14 of the shaft 1, the second radial oil groove 54 of the right balance plate 5, the first circumferential oil groove 45 of the left balance plate 4, and the oil outlet hole 46 of the left balance plate 4 can form five complete second cooling oil paths with the inherent magnetic barrier gaps 25 on the rotor core 2. The coolant of the first and second cooling oil paths can flow through all the magnetic barrier gaps 25 on the rotor core 2, and the magnetic barrier gaps 25 are connected to the transverse grooves 36 of the permanent magnet 3 and the transverse oil grooves 30 on the two sides of the magnet receiving holes 24. This increases the contact area between the permanent magnet 3 and the coolant, thereby improving the heat dissipation efficiency of the permanent magnet 3.

[0114] The following is for reference. Figures 20 to 27 Description of the motor rotor according to Embodiment 3 of the present invention

[0115] like Figure 20 and 27As shown, the rotating shaft 1 rotates, and the cooling liquid in the counterbore 11 of the rotating shaft 1 flows into the first radial oil groove 44 of the left balance plate 4 and the second radial oil groove 54 of the right balance plate under the action of centrifugal force through the first oil inlet hole 13 and the second oil inlet hole 14 of the rotating shaft 1, respectively. The cooling liquid in the first radial oil groove 44 of the left balance plate 4 is dispersed into the transverse oil groove 30 on the two sides of the transverse groove 36 and the magnet accommodating hole 24 of the permanent magnet 3 through the second gap 252 of the magnetic barrier gap 25 on the rotor core 2, thereby flowing into the first gap 251 and the third gap 253 of the magnetic barrier gap 25, and then flowing into the second circumferential oil groove 55 of the right balance plate 5 through the first gap 251, the second gap 252 and the third gap 253 of the magnetic barrier gap 25, and then flowing out from the oil outlet hole 56 on the right balance plate 5, thereby forming a complete first cooling oil circuit, and the number of the first cooling oil circuit is 1 / 2 of the number of the magnet accommodating hole 24. Similarly, the cooling liquid in the second radial oil groove 54 of the right balance plate 5 is dispersed into the transverse oil groove 30 on the two sides of the transverse groove 36 and the magnet accommodating hole 24 of the permanent magnet 3 through the second gap 252 of the magnetic barrier gap 25 on the rotor core 2, thereby flowing into the first gap 251 and the third gap 253 of the magnetic barrier gap 25, and then flowing into the first circumferential oil groove 45 of the left balance plate 4 through the first gap 251, the second gap 252 and the third gap 253 of the magnetic barrier gap 25, and then flowing out from the oil outlet hole 46 on the left balance plate 4, thereby forming a complete second cooling oil circuit, and the number of the second cooling oil circuit is 1 / 2 of the number of the magnet accommodating hole 24. Thus, the cooling of all the permanent magnets 3 in the rotor core 2 can be realized, and the contact area between the permanent magnets 3 and the cooling liquid is increased, so as to reduce the risk of demagnetization of the permanent magnets 3 due to high temperature.

[0116] According to the motor rotor, the cooling oil circuit formed by the rotating shaft 1, the left balance plate 4, the right balance plate 5 and the magnetic barrier gap 25 of the rotor core 2 can realize the direct contact between the cooling liquid and the permanent magnets 3, instead of indirectly realizing the cooling of the permanent magnets by cooling the rotor core of the motor. In addition, the contact area between the permanent magnets 3 and the cooling liquid can be increased by arranging a heat dissipation oil groove on the inner side of the magnet accommodating hole of the rotor core or by arranging a groove on the permanent magnet and communicating with the magnetic barrier gap, so that the cooling efficiency of the permanent magnets 3 can be greatly improved, thereby improving the performance and service life of the motor.

[0117] In this application, unless otherwise clearly indicated and limited, the terms "mounting", "connection", "connecting", "fixed", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0118] are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above-mentioned terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification.

[0119] Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

[0120] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure made by using the content of the specification and drawings, or directly or indirectly applied to other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A motor rotor, characterized in that, include: The rotating shaft has a first oil inlet hole and a second oil inlet hole on its outer circumferential surface; The rotor core includes a first end face and a second end face disposed opposite to each other. A magnet receiving hole is provided on the first end face, and the magnet receiving hole extends through the second end face along the axial direction of the rotating shaft. The first balance plate is connected to the second end face of the rotor core. The inner end face of the first balance plate is provided with a first oil passage. The first oil passage includes a first radial oil groove and a first circumferential oil groove. The first radial oil groove is connected to the first oil inlet hole of the rotating shaft. A second balancing plate is connected to the first end face of the rotor core. The inner end face of the second balancing plate is provided with a second oil passage, which includes a second radial oil groove and a second circumferential oil groove. The second radial oil groove is connected to the second oil inlet hole of the rotating shaft. Permanent magnets are embedded in pairs within the magnet receiving holes of the rotor core and together with the magnet receiving holes form a magnetic barrier gap in the rotor core. The first balance plate, the rotor core, and the second balance plate are sequentially sleeved on the rotating shaft along the axial direction of the shaft, and the first circumferential oil groove and the second circumferential oil groove are respectively connected to the magnetic barrier gap; The magnetic barrier gaps of the rotor core include a first gap, a second gap, and a third gap. The first circumferential oil groove and the second circumferential oil groove connect adjacent first gaps and third gaps of the rotor core. The first circumferential oil groove includes a T-shaped oil groove and an I-shaped oil groove. The T-shaped oil groove and the I-shaped oil groove are arranged alternately at equal angular intervals along the circumference of the first balance plate. The bottom end of the I-shaped oil groove connects the second gap of the magnetic barrier gap in the adjacent magnet receiving hole. The second radial oil groove connects adjacent second gaps of the rotor core.

2. The motor rotor according to claim 1, characterized in that, The magnet receiving holes are arranged circumferentially along the rotor core. The magnet receiving holes include a first side hole and a second side hole. The first side hole and the second side hole intersect at an angle to form a V shape and are connected.

3. The motor rotor according to claim 2, characterized in that, The second gap is formed at the end where the first side hole and the second side hole of the magnet receiving hole intersect; the two side ends of the first side hole and the second side hole away from the intersection of the magnet receiving hole form a first gap and a third gap with the permanent magnet, respectively.

4. The motor rotor according to claim 1, characterized in that, The first end face of the rotor core is provided with an oil hole, which extends along the axial direction of the shaft to the second end face and communicates with the second circumferential oil groove of the second balance plate.

5. The motor rotor according to claim 1, characterized in that, The number of the first radial oil grooves on the first balance plate and the number of the second radial oil grooves on the second balance plate are equal, and both are 1 / 2 of the number of magnet receiving holes in the rotor core.

6. The motor rotor according to claim 1, characterized in that, The first balance plate has a first oil outlet hole on its outer end face, which is partially connected to the first circumferential oil groove of the first balance plate; the second balance plate has a second oil outlet hole on its outer end face, which is partially connected to the second circumferential oil groove of the second balance plate.

7. The motor rotor according to claim 2, characterized in that, The first end face of the rotor core is provided with a plurality of axial through holes, which are arranged around the outer ring of each magnet receiving hole of the rotor core and communicate with the magnet receiving hole.

8. The motor rotor according to claim 2, characterized in that, The permanent magnet has grooves that penetrate the permanent magnet on its two opposite sides and are connected to the magnetic barrier gap.

9. The motor rotor according to claim 1, characterized in that, The rotor core includes a plurality of first laminations and a plurality of second laminations that are stacked alternately along the central axis of the rotor shaft. The cross-sectional area of ​​the magnet receiving hole on the first lamination is smaller than the cross-sectional area of ​​the magnet receiving hole on the second lamination.

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