Oil-cooled staggered-pole rotor

Abstract

The utility model discloses an oil-cooled staggered-pole rotor, which comprises a pair of dynamic balance plates arranged oppositely, a rotor iron core connected with the pair of dynamic balance plates, and a rotating shaft matched with the rotor iron core for use, wherein the rotor iron core comprises a plurality of rotor punching sheets which are coaxially superposed between a pair of dynamic balance plates; each rotor punching sheet comprises a disc-shaped punching sheet body, a shaft hole which is formed in the punching sheet body and is suitable for a rotating shaft to pass through, and an even number of magnetic steel groove groups which are uniformly distributed along the circumferential direction of the shaft hole at intervals; a main oil duct extending in the axial direction, a plurality of oil guide grooves formed in the outer side wall of the rotating shaft at intervals in the circumferential direction and a plurality of oil guide holes formed between the main oil duct and each oil guide groove in a one-to-one mode are formed in the rotating shaft; each dynamic balance plate is provided with a plurality of connecting grooves communicated with the oil guide grooves and the circulating grooves and a plurality of liquid discharging holes used for discharging cooling liquid; and each liquid discharge hole is obliquely distributed relative to the axial direction of the dynamic balance plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to an oil cooling type pole -inverted rotor. BACKGROUND

[0002] For the electric vehicle drive system, its operation process needs heat dissipation to ensure that the motor performance is reliable and stable in the long-term use. For the heat dissipation of the drive system, the core structure is the heat dissipation of the motor, for this, part of the electric vehicle drive system motor in the prior art adopts the water cooling mode, but through the actual research, it is found that the heat resistance is very large, and the heat dissipation effect is general through the water channel cooling heat dissipation outside the motor shell. In comparison, the oil cooling mode, the motor oil cooling directly flows from the inside of the motor, and is sprayed to the surface of the motor, so as to reduce the thermal resistance, increase the heat dissipation area, the cooling effect is better, and the motor performance is better.

[0003] Based on the above situation, for the oil cooling mode, generally, the cooling oil passage is designed in the rotor to realize the effective heat dissipation of the rotor. The cooling oil is driven by the oil pump to be pumped out from the oil tank and delivered to the oil cooling passage of the rotor. When the cooling oil flows in the passage, it directly contacts the high temperature part of the rotor and absorbs the heat generated thereby. Subsequently, the cooling oil after absorbing heat flows out of the rotor and enters the heat exchanger, and the heat is dissipated to the external environment by air cooling or water cooling. The cooled oil is recycled back to the oil tank and continues to be used for cooling the rotor after filtration. This cycle process continues to effectively reduce the temperature of the rotor, prevent overheating and ensure the stability and performance of the motor in high load and long time operation. For this, for example, the publication number CN117154982A discloses a motor rotor oil cooling system, at least one oil channel is formed in the iron core monomer. Although the oil channel here can realize the flow demand of the lubricating oil, in order to improve the lubrication effect of the motor, the inner diameter of the oil channel needs to be increased to increase the flow of the lubricating oil, or the number of the oil channel needs to be increased to increase the flow of the lubricating oil. In fact, for the heat generated during the use of the motor, the cooling of the magnetic steel can quickly realize the cooling effect of the motor, so whether the inner diameter or the number of the oil channel can directly realize the cooling of the magnetic steel. Furthermore, the oil outlet hole of the two end dynamic balance plates is in the vertical direction, and the cooling oil is difficult to effectively fall and spray on the stator coil.

[0004] In summary, for the motor applied in the electric vehicle drive system, the cooling mode thereof needs to be further optimized. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing an oil cooling type pole-inverted rotor to solve the technical problem of optimizing the cooling mode.

[0006] The oil cooling type pole-inverted rotor of the utility model is realized as follows:

[0007] The oil-cooled misaligned rotor comprises a pair of dynamic balance plates arranged oppositely, a rotor core connected with the pair of dynamic balance plates, and a rotating shaft used in cooperation with the rotor core, wherein

[0008] The rotor core comprises a plurality of rotor laminations coaxially stacked between the pair of dynamic balance plates;

[0009] Each of the rotor laminations comprises a lamination body in the shape of a round sheet, a shaft hole suitable for the rotating shaft to pass through arranged on the lamination body, and an even number of magnetic steel groove groups uniformly distributed along the circumference of the shaft hole; each of the magnetic steel groove groups comprises at least a pair of first magnetic steel grooves symmetrically distributed in the shape of a splayed figure; there is a misalignment between the first magnetic steel grooves of each adjacent two rotor laminations; and a magnetic steel is arranged in each of the first magnetic steel grooves;

[0010] Each of the first magnetic steel grooves comprises a receiving groove for accommodating the magnetic steel and a flow-through groove for flowing the cooling liquid which are connected through; and the flow-through groove is located at the tip of the splayed figure of each of the magnetic steel groove groups;

[0011] The rotating shaft is provided with a main oil channel extending in the axial direction, a plurality of oil guide grooves arranged on the outer sidewall of the rotating shaft in the circumferential direction, and a pair of a plurality of oil guide holes arranged between the main oil channel and each of the oil guide grooves; each of the oil guide grooves extends along the axial direction of the rotating shaft;

[0012] Each of the dynamic balance plates is respectively provided with a plurality of link grooves connecting the oil guide grooves and the flow-through grooves and a plurality of liquid discharge holes for discharging the cooling liquid; each of the liquid discharge holes is inclinedly distributed relative to the axial direction of the dynamic balance plate, and each of the liquid discharge holes is inclined from the inner side of the rotor core to the direction of the motor stator on the outer side of the rotor core.

[0013] In the optional implementation of the utility model, the groove width of the flow-through groove is at least twice the groove width of the receiving groove; and the groove length of the flow-through groove is 1 / 3-1 / 2 of the groove length of the receiving groove.

[0014] In the optional implementation of the utility model, the pair of first magnetic steel grooves corresponding to the tip position of the splayed figure of each of the magnetic steel groove groups is further provided with a through hole suitable for the flow of the cooling liquid;

[0015] The through hole is located between the flow-through grooves of the pair of first magnetic steel grooves.

[0016] In the optional implementation of the utility model, the cross section of the through hole is rectangular, and the flow-through groove at least comprises an expansion part with a rectangular cross section adjacent to the through hole;

[0017] The side ends corresponding to the through hole of the expansion part are parallel to each other.

[0018] In optional implementation of the utility model, each oil guide hole extends along the radial direction of the rotating shaft, and each oil guide hole corresponds to the middle part of the axial direction of the rotor core.

[0019] In optional implementation of the utility model, the even number of magnetic steel slot groups of each rotor punching sheet include N-pole magnetic steel slot group and S-pole magnetic steel slot group.

[0020] The connecting grooves on one of the two dynamic balance plates are in one-to-one communication with the flow-through grooves of the N-pole magnetic steel slot group at the axial side end of the rotor core corresponding to the dynamic balance plate, and the drainage holes on the dynamic balance plate are in one-to-one communication with the flow-through grooves of the S-pole magnetic steel slot group at the axial side end of the rotor core corresponding to the dynamic balance plate.

[0021] The connecting grooves on the other dynamic balance plate are in one-to-one communication with the flow-through grooves of the S-pole magnetic steel slot group at the axial side end of the rotor core corresponding to the dynamic balance plate, and the drainage holes on the dynamic balance plate are in one-to-one communication with the flow-through grooves of the N-pole magnetic steel slot group at the axial side end of the rotor core corresponding to the dynamic balance plate.

[0022] In optional implementation of the utility model, at least two groups of liquid outlet holes are arranged on the part of the rotating shaft outside one axial end of the rotor core and are spaced apart along the axial direction of the rotating shaft.

[0023] Each group of liquid outlet holes includes at least one flow-through hole extending along the radial direction of the rotating shaft and in communication with the main oil passage.

[0024] In optional implementation of the utility model, the inner wall of the shaft hole of each rotor punching sheet is provided with a positioning key protruding towards the shaft center of the shaft hole.

[0025] The positioning key corresponds to one magnetic steel slot group, and the positioning key is located on the symmetry axis of a pair of first magnetic steel slots included in the corresponding magnetic steel slot.

[0026] The outer side wall of the rotating shaft is further provided with a positioning groove suitable for embedding the positioning key.

[0027] In optional implementation of the utility model, the positioning key is rectangular or semicircular.

[0028] The line connecting the center of the positioning key and the shaft center of the shaft hole and the symmetry axis of a pair of first magnetic steel slots included in the corresponding magnetic steel slot form an acute angle.

[0029] In optional implementation of the utility model, the positioning key is further provided with a mark groove.

[0030] The mark groove is offset to one side of the line connecting the center of the positioning key and the shaft center of the shaft hole.

[0031] The utility model discloses an oil -cooled pole -skewing rotor has following beneficial effect: the oil -cooled pole -skewing rotor of the utility model through the design of every discharge hole on the dynamic balance board is inclined to the motor stator direction from the inside of rotor iron core to the outside of rotor iron core, makes the cooling liquid that every discharge hole discharges can spray on stator coil, has reduced motor temperature gradient, has greatly promoted the performance and service life of motor, has solved the problem that cooling oil can not effectively spray on stator coil, leads to motor overheating and performance decline. Through the flow -through groove for circulating cooling liquid designed in every first magnetic steel groove, cooling liquid can directly contact the magnetic steel that generates heat energy in use, to realize direct cooling for magnetic steel, thereby to accelerate the cooling speed of rotor iron core.

[0032] In addition, for the overall rotor iron core, the angular key matching mark groove can specifically realize the misplacement between the magnetic steel groove groups of the rotor punching sheet positive and negative cold pressing into the shaft, and the rotor pole skewing can be simply realized, so as to weaken the cogging torque and rotor fluctuation, improve the motor output performance, and based on the misplacement between the magnetic steel groove groups on the adjacent rotor punching sheets, the flow process of the cooling liquid circulating in the flow-through groove of the first magnetic steel groove becomes tortuous, thereby increasing the contact area of the cooling liquid and the flow-through groove, improving the cooling efficiency of the magnetic steel in the flow-through groove, and optimizing the cooling effect. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is structure schematic diagram of oil -cooled pole -skewing rotor of the utility model;

[0034] Figure 2 It is structure schematic diagram of oil -cooled pole -skewing rotor of the utility model's rotating shaft's oil guide hole;

[0035] Figure 3 It is structure schematic diagram of oil -cooled pole -skewing rotor of the utility model's rotating shaft;

[0036] Figure 4 It is structure schematic diagram of oil -cooled pole -skewing rotor of the utility model's dynamic balance board's discharge hole;

[0037] Figure 5 It is structure schematic diagram of oil -cooled pole -skewing rotor of the utility model's dynamic balance board's link groove;

[0038] Figure 6 It is flow -through schematic diagram of oil -cooled pole -skewing rotor of the utility model's discharge oil between dynamic balance board and rotor punching sheet;

[0039] Figure 7 It is structure schematic diagram of oil -cooled pole -skewing rotor of the utility model's rotor punching sheet;

[0040] Figure 8 It is Figure 7A part of the enlarged schematic view of the A part in an alternative embodiment of the utility model;

[0041] Figure 9 A part of the enlarged schematic view of the A part in an alternative embodiment of the utility model; Figure 7 A part of the enlarged schematic view of the A part in an alternative embodiment of the utility model;

[0042] Figure 10 The schematic view of the pole-skewed structure formed by the rotor lamination of the rotor core of the oil-cooled pole-skewed rotor of the utility model.

[0043] In the figure: the lamination body 1, the magnetic steel groove group 2, the accommodating groove 211, the flow groove 212, the expansion part 213, the through hole 22, the shaft hole 3, the positioning key 4, the mark groove 41, the balance key 5, the rotating shaft 6, the main oil channel 61, the oil guide groove 62, the liquid inlet 63, the oil guide hole 64, the key groove 65, the adaptive groove 66, the liquid outlet hole 67, the auxiliary groove 7, the dynamic balance plate 8, the link groove 81, the liquid discharge hole 82. DETAILED DESCRIPTION

[0044] In order to make the content of the utility model more easily be clearly understood, the following according to specific embodiment and combining the drawings, the utility model is further detailed.

[0045] Embodiment 1:

[0046] Please refer to Figures 1 to 10 As shown in the figure, the embodiment provides an oil-cooled pole-skewed rotor, which comprises: a pair of oppositely arranged dynamic balance plates 8, a rotor core connected with the pair of dynamic balance plates 8 and a rotating shaft 6 used in cooperation with the rotor core;Wherein the rotor core comprises a plurality of coaxially stacked rotor laminations arranged between the pair of dynamic balance plates 8.

[0047] Each rotor lamination comprises: a lamination body 1 in the form of a round sheet, and a shaft hole 3 and an even number of magnetic steel groove groups 2 spaced apart and uniformly distributed along the circumference of the shaft hole 3 arranged on the lamination body 1;Each magnetic steel groove group 2 comprises at least a pair of first magnetic steel grooves symmetrically distributed in the shape of an eight character. Each first magnetic steel groove is provided with a magnetic steel. It should be noted that, for each magnetic steel groove group 2, it can also include two pairs of magnetic steel grooves, one pair of magnetic steel grooves is larger than the other pair of magnetic steel grooves, and the two pairs of magnetic steel grooves are arranged along the radial direction of the rotor lamination, the first magnetic steel groove in the embodiment refers to the pair of magnetic steel grooves close to the shaft hole 3 in each magnetic field groove group, which is larger in size, and the magnetic steel arranged therein is also relatively larger in size, and more heat may be generated during use, which requires timely cooling.

[0048] For the case where the rotor core comprises a plurality of rotor laminations after stacking, there is a misalignment between the first magnetic steel grooves of each adjacent two rotor laminations to make the rotor pole-skewed, so as to weaken the cogging torque and rotor fluctuation, and improve the output performance of the corresponding motor.

[0049] More specifically, each first magnetic steel slot comprises a receiving slot 211 for accommodating a magnetic steel and a flow-through slot 212 for flowing cooling liquid, which are connected through; wherein the flow-through slot 212 is located at the pointed end of the eight-shaped magnetic steel slot group 2; based on this, it is necessary to point out that the slot width of the flow-through slot 212 is at least twice the slot width of the receiving slot 211; and the slot length of the flow-through slot 212 is 1 / 3-1 / 2 of the slot length of the receiving slot 211. Under this structure, the cooling liquid can flow in the flow-through slot 212 and directly contact the magnetic steel which generates heat energy during use to achieve direct cooling of the magnetic steel, thereby accelerating the cooling speed of the rotor core; and the flow-through slot 212 is designed at the pointed end of the eight-shaped magnetic steel slot group 2, so that the flow-through slot 212 can make full use of the space of the pointed end of the eight-shaped magnetic steel slot group 2, thereby increasing the internal space of the flow-through slot 212, thereby increasing the total amount of cooling liquid flowing in the flow-through slot 212 per unit time, and further improving the cooling efficiency of the magnetic steel.

[0050] For the rotor lamination described above, the following structural changes can also be made:

[0051] The pair of first magnetic steel slots included in each magnetic steel slot group 2 also has a through hole 22 suitable for cooling liquid flow at the position of the pointed end of the eight shape; the through hole 22 is located between the flow-through slots 212 of the pair of first magnetic steel slots.

[0052] Based on the above structure, in combination with the drawings, an optional implementation case is described, the cross section of the through hole 22 is rectangular, and the flow-through slot 212 at least includes an expansion part 213 with a rectangular cross section adjacent to the through hole 22. In this case, in order to improve the compactness of the layout of the through hole 22 and the flow-through slot 212 as much as possible, it is convenient for the cooling liquid in the through hole 22 and the adjacent flow-through slot 212 to adapt to the same cooling liquid inlet and the same cooling liquid outlet, the side ends corresponding to the expansion part 213 and the through hole 22 are parallel to each other.

[0053] In addition, in order to effectively utilize the internal space of the through hole 22 to increase the capacity of the cooling liquid that can pass through, the size of the through hole 22 along the symmetry axis direction of the pair of first magnetic steel slots in this embodiment is not less than the size of the flow-through slot 212 along the symmetry axis direction of the pair of first magnetic steel slots.

[0054] Next, it is necessary to explain the rotating shaft 6:

[0055] The rotating shaft 6 is provided with a main oil passage 61 extending in the axial direction, a plurality of oil guide grooves 62 arranged on the outer wall of the rotating shaft 6 in the circumferential direction, and a plurality of oil guide holes 64 arranged between the main oil passage 61 and each oil guide groove 62. Each oil guide groove 62 extends along the axial direction of the rotating shaft 6. An inlet 63 for the cooling liquid is arranged at one axial end of the rotating shaft 6 and is in communication with the main oil passage 61. Optionally, each oil guide hole 64 extends along the radial direction of the rotating shaft 6, and each oil guide hole 64 corresponds to the middle position of the axial direction of the rotor core. In this structure, the cooling liquid in the main oil passage 61 is divided into two streams along the axial direction of the rotor core through the oil guide holes 64 along the oil guide grooves 62, one of which flows to one dynamic balance plate 8, and the other of which flows to the other dynamic balance plate 8.

[0056] Each dynamic balance plate 8 is provided with a plurality of connection grooves 81 connecting the oil guide grooves 62 and the flow-through grooves, and a plurality of drain holes 82 for draining the cooling liquid. Each drain hole 82 is inclined with respect to the axial direction of the dynamic balance plate 8, and each drain hole 82 is inclined from the inside of the rotor core to the direction of the motor stator outside the rotor core. That is, the cooling liquid flows to the direction of the motor stator during the process of flowing from the inside of the rotor core to the outside of the rotor core. The radial distance between the end of the drain hole 82 towards the inside of the rotor core and the rotating shaft 6 is less than the radial distance between the end of the drain hole 82 towards the outside of the rotor core and the rotating shaft 6.

[0057] Based on the above, it should be noted that the polarity of the magnetic steel in each rotor lamination is arranged in the circumferential direction with N-pole and S-pole adjacent, that is, each adjacent S-pole magnetic steel is sandwiched by N-pole magnetic steel. For this purpose, each rotor lamination has an even number of magnetic steel slot groups, including N-pole magnetic steel slot groups for mounting N-pole magnetic steel and S-pole magnetic steel slot groups for mounting S-pole magnetic steel. The connection grooves 81 on one of the two dynamic balance plates 8 are in one-to-one communication with the flow-through grooves 212 (and through holes 22) of the N-pole magnetic steel slot groups at the axial end of the rotor core corresponding to the dynamic balance plate 8, and the drain holes 82 on this dynamic balance plate 8 are in one-to-one communication with the flow-through grooves 212 (and through holes 22) of the S-pole magnetic steel slot groups at the axial end of the rotor core corresponding to the dynamic balance plate 8. The connection grooves 81 on the other dynamic balance plate 8 are in one-to-one communication with the flow-through grooves 212 (and through holes 22) of the S-pole magnetic steel slot groups at the axial end of the rotor core corresponding to the dynamic balance plate 8, and the drain holes 82 on this dynamic balance plate 8 are in one-to-one communication with the flow-through grooves 212 (and through holes 22) of the N-pole magnetic steel slot groups at the axial end of the rotor core corresponding to the dynamic balance plate 8. Here, for example, the rotor core includes four S-pole magnetic steel slots and four N-pole magnetic steel slots, and the number of oil guide grooves 62 in the rotating shaft 6 is eight, the number of connection grooves 81 on each dynamic balance plate 8 is four, and the number of drain holes 82 on each dynamic balance plate 8 is also four.

[0058] On the basis of the above-mentioned case, for the two dynamic balance plates 8 connected to the same oil guide groove 62, the two dynamic balance plates 8 are connected to different magnetic steel groove groups, so if the connection groove 81 on one dynamic balance plate 8 extends along the radial direction of the dynamic balance plate 8, the connection groove 81 on the other dynamic balance plate 8 is offset relative to the radial direction of the dynamic balance plate 8.

[0059] Based on the above structure, that is, the cooling liquid flowing into the connection groove 81 of one of the dynamic balance plates 8 through the oil guide groove 62 will flow through the N-pole magnetic steel groove group to the drainage hole 82 of the opposite dynamic balance plate 8 to be discharged, thereby forming a cooling liquid flow direction for rotor cooling; and the cooling liquid flowing into the connection groove 81 of the other dynamic balance plate 8 through the oil guide groove 62 will flow through the S-pole magnetic steel groove group to the drainage hole 82 of the opposite dynamic balance plate 8 to be discharged, thereby forming another cooling liquid flow direction for rotor cooling. The two cooling liquid directions are opposite and do not interfere with each other to form cooling for the rotor.

[0060] In addition, it should be noted that the shaft 6 is located outside one axial end of the rotor core, and at least two groups of liquid outlet holes 67 are arranged on the shaft 6 at the position of the liquid inlet hole 63 and spaced along the axial direction of the shaft 6; Each group of liquid outlet holes 67 includes at least one flow hole extending along the radial direction of the shaft 6 and communicating with the main oil channel 61, for lubricating and cooling the bearings and gear pairs fitted on the shaft 6.

[0061] In summary, for the oil-cooled wrong-pole rotor of the present embodiment, not only is the cooling efficiency high, but also by designing each drainage hole 82 on the dynamic balance plate 8 to be inclined from the inside of the rotor core to the direction of the motor stator outside the rotor core, the cooling liquid discharged from the drainage hole 82 can be sprayed on the stator winding, reducing the motor temperature gradient and greatly improving the performance and service life of the motor.

[0062] Embodiment 2:

[0063] Please refer to Figures 1 to 10 Based on the oil-cooled wrong-pole rotor of embodiment 1, the present embodiment provides an oil-cooled wrong-pole rotor, which is designed in a way that the first magnetic steel grooves of adjacent rotor laminations are misaligned, and an alternative case is illustrated in detail in combination with the drawings:

[0064] Firstly, the inner wall of the shaft hole 3 of each rotor lamination is provided with a positioning key 4 protruding towards the shaft center of the shaft hole 3; the positioning key 4 corresponds to a magnetic steel slot group 2, and the positioning key 4 is located on the symmetry axis of a pair of first magnetic steel slots included in the corresponding magnetic steel slot. Based on this, when the rotor core of the embodiment is used in a specific rotor, the shaft hole 3 of the rotor lamination is assembled with the shaft 6. For this, the shaft 6 is provided with a key groove 65 suitable for the insertion of the positioning key 4.

[0065] Secondly, from the perspective of facilitating processing, the positioning key 4 is rectangular or semicircular; the line connecting the center of the positioning key 4 and the shaft center of the shaft hole 3 forms an acute angle α with the symmetry axis of a pair of first magnetic steel slots included in the corresponding magnetic steel slot. Based on this structure, when two rotor laminations are stacked, as long as the rotor laminations are assembled in a positive-negative manner, the first magnetic steel slots of two adjacent rotor laminations can be offset, so that the first magnetic steel slots of each adjacent two rotor laminations form an angle of 2α. In this way, for the positioning keys 4 corresponding to different rotor laminations on the shaft 6, a corresponding key groove 65 does not need to be provided for each positioning key 4, but only one key groove 65 can be used to adapt to the positioning keys 4 on multiple rotor laminations to meet the use requirements of the embodiment. Therefore, the rotor pole offset can be easily achieved by using the embodiment, which can weaken the cogging torque and rotor fluctuation and improve the output performance of the motor. Of course, it can be understood that at least two rotor laminations can be stacked in one direction to form a section of rotor lamination, and then two adjacent sections of rotor lamination are stacked in a positive-negative manner to form a structure of rotor pole offset.

[0066] Furthermore, based on the above, in order to more quickly identify the front and back surfaces of the rotor lamination when the rotor laminations are stacked, a mark groove 41 is further provided on the positioning key 4, the mark groove 41 is provided at the side end of the positioning key 4 facing the shaft hole 3, and the mark groove 41 is offset to one side of the line connecting the center of the positioning key 4 and the shaft center of the shaft hole 3. Based on this, when the front and back surfaces of two adjacent rotor laminations are combined, the mark groove 41 on the corresponding positioning key 4 will form a left-right distribution relative to the line connecting the center of the positioning key 4 and the shaft center of the shaft hole 3, so that when assembling adjacent rotor laminations, a person only needs to observe the mark groove 41 to quickly identify the front and back surfaces of the rotor laminations.

[0067] On the basis of the above structure, the inner wall of the shaft hole 3 of each rotor lamination is provided with a balance key 5 protruding towards the shaft center of the shaft hole 3, and the outer side wall of the shaft 6 is provided with an adaptation groove 66 suitable for the balance key 5; the balance key 5 and the positioning key 4 are symmetrically arranged with respect to the shaft center of the shaft hole 3. The design of the balance key 5 plays a role in balancing the weight of the rotor lamination.

[0068] In addition, in an optional implementation, a pair of auxiliary grooves 7 corresponding to each magnetic steel slot and symmetrically arranged with the symmetry axis of the pair of first magnetic steel slots included in the magnetic steel slot as a center line are arranged on the outer circular wall of the rotor lamination sheet, so that high-order harmonics can be eliminated, the cogging torque can be reduced, and the NVH of the motor can be improved.

[0069] In summary, for the oil-cooled misaligned rotor of the embodiment, based on the misalignment between the magnetic steel slot groups 2 on the adjacent rotor lamination sheets, the flow process of the cooling liquid flowing in the flow-through groove 212 of the first magnetic steel slot is made tortuous, so as to increase the contact area of the cooling liquid with the flow-through groove 212 and the through hole 22, improve the cooling efficiency of the rotor core, and optimize the cooling effect.

[0070] The above specific embodiments further illustrate the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above are only specific embodiments of the utility model and are not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

[0071] In the description of the utility model, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0072] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled persons in the art, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0073] In the description of the utility model, it is necessary to explain that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation based on the drawings shown or the orientation or position relation commonly placed when the utility model product is used, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

[0074] In addition, the terms "horizontal", "vertical", "overhang" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0075] In the utility model, unless otherwise explicitly specified and limited, the first feature above or below the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature therebetween. Moreover, the first feature above, above and above the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature below, below and below the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

Claims

1. An oil-cooled, misaligned rotor, characterized in that, include: A pair of dynamic balance plates set opposite each other, a rotor core connected to the pair of dynamic balance plates, and a rotating shaft used in conjunction with the rotor core; in The rotor core includes a plurality of rotor laminations coaxially stacked between a pair of dynamic balance plates; Each rotor lamination includes a lamination body in the shape of a disc, and a shaft hole on the lamination body suitable for the shaft to pass through, and an even number of magnet slots evenly distributed circumferentially along the shaft hole; each magnet slot group includes at least a pair of first magnet slots symmetrically distributed in a figure-eight shape; there is a misalignment between the first magnet slots of each two adjacent rotor laminations; each first magnet slot is provided with a magnet; Each of the first magnet slots includes a receiving slot for accommodating magnets and a flow slot for circulating coolant; wherein the flow slot is located at the tip of the figure-eight shape of each magnet slot group; The rotating shaft is provided with a main oil passage extending along the axial direction, multiple oil guide grooves spaced apart on the outer wall of the rotating shaft in the circumferential direction, and multiple oil guide holes provided one-to-one between the main oil passage and each oil guide groove; each of the oil guide grooves extends along the axial direction of the rotating shaft. Each of the aforementioned dynamic balance plates is provided with multiple connecting grooves that connect the oil guide grooves and the flow grooves, and multiple drain holes for discharging coolant; each drain hole is axially inclined relative to the dynamic balance plate, and each drain hole is inclined from the inner side of the rotor core toward the motor stator direction from the outer side of the rotor core.

2. The oil-cooled staggered-pole rotor according to claim 1, characterized in that, The width of the flow channel is at least twice the width of the receiving channel; and the length of the flow channel is 1 / 3 to 1 / 2 of the length of the receiving channel.

3. The oil-cooled misaligned rotor according to claim 1 or 2, characterized in that, Each of the magnetic steel groove groups includes a pair of first magnetic steel grooves with corresponding figure-eight-shaped tip positions also provided with through holes suitable for coolant flow; The through hole is located between the flow channels of a pair of first magnet grooves.

4. The oil-cooled staggered-pole rotor according to claim 3, characterized in that, The through hole has a rectangular cross-section, and the flow groove includes at least an enlarged portion with a rectangular cross-section adjacent to the through hole; The expansion section and the side end corresponding to the through hole are parallel to each other.

5. The oil-cooled staggered-pole rotor according to claim 1, characterized in that, Each of the oil guide holes extends radially along the shaft, and each of the oil guide holes corresponds to the axial center position of the rotor core.

6. The oil-cooled staggered-pole rotor according to claim 1, characterized in that, Each rotor lamination has an even number of magnet slot groups, including an N-pole magnet slot group and an S-pole magnet slot group. One of the two dynamic balancing plates has a connecting groove that is connected one-to-one with the flow groove of the N-pole magnet slot group on the axial side end of the corresponding rotor core; and the drain hole on this dynamic balancing plate is connected one-to-one with the flow groove of the S-pole magnet slot group on the axial side end of the corresponding rotor core. The connecting groove on the other dynamic balancing plate is connected to the flow groove of the S pole magnet groove group on the shaft side end of the rotor core corresponding to the dynamic balancing plate, and the drain hole on this dynamic balancing plate is connected to the flow groove of the N pole magnet groove group on the shaft side end of the rotor core corresponding to the dynamic balancing plate.

7. The oil-cooled staggered-pole rotor according to claim 1, characterized in that, The rotating shaft is located on the outer side of one end of the rotor core and is provided with at least two sets of liquid outlet holes at intervals along the axial direction of the rotating shaft. Each set of outlet holes includes at least one flow hole that extends radially along the shaft and communicates with the main oil passage.

8. The oil-cooled staggered-pole rotor according to claim 1, characterized in that, Each rotor lamination has a locating key on the inner wall of its shaft hole that protrudes toward the axis of the shaft hole; Each positioning key corresponds to a set of magnetic slots, and each positioning key is located on the axis of symmetry of a pair of first magnetic slots included in the corresponding magnetic slot; and The outer wall of the shaft is also provided with a positioning groove suitable for embedding the positioning key.

9. The oil-cooled staggered-pole rotor according to claim 8, characterized in that, The positioning key is rectangular or semi-circular; and There is an acute angle between the line connecting the center of the positioning key and the axis of the shaft hole and the axis of symmetry of the pair of first magnetic grooves included in the corresponding magnetic groove.

10. The oil-cooled misaligned rotor according to claim 9, characterized in that, The positioning key is also provided with a marking groove; and The marking groove is offset to one side of the line connecting the center of the locating key and the axis of the shaft hole.

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