Rotor punching sheet and rotor iron core using same

Abstract

The utility model discloses a rotor punching sheet and a rotor core using the same. The rotor punching sheet comprises a disc-shaped punching sheet body, a shaft hole arranged on the punching sheet body, and an even number of magnetic steel groove groups uniformly distributed along the circumferential direction of the shaft hole at intervals. Each magnetic steel groove group at least comprises a pair of first magnetic steel grooves which are symmetrically distributed in a splayed shape; each first magnetic steel groove comprises an accommodating groove for accommodating magnetic steel and a circulating groove for circulating cooling liquid, which are connected in a penetrating manner; wherein the circulating groove is located at the tip of the splayed shape of each magnetic steel groove group; the groove width of the circulating groove is at least twice that of the accommodating groove; and the groove length of the circulating groove is 1 / 3-1 / 2 of the groove length of the accommodating groove.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially, it relates to a rotor lamination and use its rotor core. 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 lies in 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 is adopted, the motor oil cooling directly flows through the lubricating oil cooled from the motor interior, and sprays to the motor surface, thereby reducing the heat resistance, increasing the heat dissipation area, the cooling effect is better, and the motor performance is more excellent.

[0003] Based on the above situation, for the oil cooling mode, for example, the publication number CN117154982A discloses a motor rotor oil cooling system, at least one oil channel is arranged in the iron core monomer, the oil channel here can realize the flow demand of the lubricating oil, in order to improve the lubricating 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 energy generated in the use process of the motor, the temperature reduction of the magnetic steel can quickly realize the temperature reduction effect of the motor, so whether the inner diameter or the number of the oil channel can directly realize the temperature reduction of the magnetic steel.

[0004] In addition, compared with the non-inclined pole rotor, the inclined pole rotor can reduce torque ripple and reduce electromagnetic noise, and for the oil cooling mode motor, the inclined pole rotor can make the oil channel in the rotor core zigzag, thereby increasing the contact area of the cooling liquid and the oil channel and improving the cooling efficiency. The implementation mode of the rotor inclined pole in the prior art is relatively complicated, and there are problems of high tooth slot torque and rotor fluctuation, which affect the motor output performance.

[0005] In summary, for the motor applied in the electric vehicle drive system, the inclined pole implementation mode and the cooling mode still need to be further optimized. UTILITY MODEL CONTENTS

[0006] The first object of the utility model is to provide a rotor lamination to solve the technical problem of optimizing the cooling mode.

[0007] The second object of the utility model is to provide a rotor core to solve the technical problem of optimizing the inclined pole mode and the cooling mode.

[0008] The rotor lamination of the utility model is realized as follows:

[0009] A rotor lamination, comprising: a lamination body in the shape of a disc, an axial hole and an even number of magnetic steel slot groups spaced and uniformly distributed along the circumference of the axial hole are arranged on the lamination body; each magnetic steel slot group comprises at least a pair of first magnetic steel slots symmetrically distributed in a figure-eight shape;

[0010] Each of the first magnetic steel slots comprises a receiving slot for accommodating a magnetic steel and a flow-through slot for flowing cooling liquid, which are connected through; wherein the flow-through slot is located at the tip of the figure-eight shape of each magnetic steel slot group;

[0011] The slot width of the flow-through slot is at least twice the slot width of the receiving slot; and the slot length of the flow-through slot is 1 / 3-1 / 2 of the slot length of the receiving slot.

[0012] In the optional implementation of the present application, a pair of first magnetic steel slots corresponding to the tip position of the figure-eight shape in each magnetic steel slot group is further provided with a through hole suitable for the flow of cooling liquid;

[0013] The through hole is located between the flow-through slots of a pair of first magnetic steel slots.

[0014] In the optional implementation of the present application, the cross section of the through hole is rectangular, and the flow-through slot comprises at least an expansion part with a rectangular cross section adjacent to the through hole.

[0015] In the optional implementation of the present application, the side ends corresponding to the expansion part and the through hole are parallel to each other.

[0016] In the optional implementation of the present application, the size of the through hole along the symmetry axis of a pair of first magnetic steel slots is not less than the size of the flow-through slot along the symmetry axis of a pair of first magnetic steel slots.

[0017] The rotor core of the present application is realized as follows:

[0018] A rotor core, comprising: a plurality of the rotor laminations coaxially stacked, and a magnetic steel arranged in each first magnetic steel slot;

[0019] There is a misalignment between the first magnetic steel slots of each adjacent two rotor laminations.

[0020] In the optional implementation of the present application, an inner wall of the axial hole of each rotor lamination is provided with a positioning key protruding towards the axis of the axial hole;

[0021] The positioning key corresponds to a 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.

[0022] In the optional implementation of the present application, the positioning key is rectangular or semicircular; and

[0023] The line connecting the center of the positioning key and the axis of the shaft hole and the symmetry axis of the pair of first magnetic steel grooves included in the corresponding magnetic steel groove form an acute angle.

[0024] In the optional implementation of the utility model, the positioning key is further provided with a mark groove.

[0025] The mark groove is offset to one side of the line connecting the center of the positioning key and the axis of the shaft hole.

[0026] In the optional implementation of the utility model, the inner wall of the shaft hole of each rotor lamination is provided with a balance key protruding towards the axis of the shaft hole.

[0027] The balance key and the positioning key are symmetrically arranged with respect to the axis of the shaft hole.

[0028] By adopting the above technical scheme, the utility model has the following beneficial effects: the rotor lamination and the rotor core using the same of the utility model, through the flow-through groove for flowing cooling liquid designed in each first magnetic steel groove, the cooling liquid can directly contact the magnetic steel generating heat energy in the use process, to realize direct cooling of the magnetic steel, thereby accelerating the cooling speed of the rotor core; and the flow-through groove is designed at the pointed end of the eight-shaped magnetic steel groove group, so that the flow-through groove can fully utilize the space of the pointed end of each magnetic steel groove group, thereby increasing the internal space of the flow-through groove, and thus increasing the total amount of the cooling liquid flowing in the flow-through groove in unit time, to further improve the cooling efficiency of the magnetic steel.

[0029] In addition, for the overall rotor core, the angular protruding key matched with the mark groove can specifically realize the misalignment between the magnetic steel groove groups when the rotor laminations are cold-pressed into the shaft, and the rotor misalignment can be simply realized, so as to weaken the cogging torque and rotor fluctuation, improve the motor output performance, and based on the misalignment between the magnetic steel groove groups on the adjacent rotor laminations, the flow process of the cooling liquid flowing 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

[0030] Figure 1 It is a structural schematic view of the rotor lamination of the utility model;

[0031] Figure 2 It is Figure 1 the enlarged schematic view of A part of in an optional implementation;

[0032] Figure 3 It is Figure 1 the enlarged schematic view of A part of in another optional implementation;

[0033] Figure 4 The rotor core of the utility model includes the schematic diagram of the pole error structure formed by the rotor punching sheet.

[0034] In the drawing: punching sheet body 1, magnetic steel groove group 2, accommodating groove 211, flow-through groove 212, expansion part 213, through hole 22, shaft hole 3, positioning key 4, mark groove 41, balance key 5, auxiliary recess 7. DETAILED DESCRIPTION

[0035] In order to make the content of the utility model more easily be clearly understood, the following according to specific embodiment and combining with the drawing, the utility model is further detailed.

[0036] Embodiment 1:

[0037] Please refer to Figures 1 to 3 As shown in the drawing, the embodiment provides a rotor punching sheet, which comprises: a punching sheet 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 and uniformly distributed along the circumference of the shaft hole 3 arranged on the punching sheet body 1; each magnetic steel groove group 2 comprises at least a pair of first magnetic steel grooves symmetrically distributed in the form of an eight character. It should be noted that each magnetic steel groove group 2 can also include two pairs of magnetic steel grooves, one pair of magnetic steel grooves is larger in size 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 punching sheet. 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 size of the magnetic steel arranged therein is also relatively large, and more heat may be generated during use, which requires timely cooling.

[0038] More specifically, each first magnetic steel groove comprises an accommodating groove 211 for accommodating a magnetic steel and a flow-through groove 212 for flowing through a cooling liquid, which are connected through; wherein the flow-through groove 212 is located at the tip of the eight character of each magnetic steel groove group 2; based on this, it should be noted that the groove width of the flow-through groove 212 is at least twice the groove width of the accommodating groove 211; and the groove length of the flow-through groove 212 is 1 / 3-1 / 2 of the groove length of the accommodating groove 211. Under this structure, the cooling liquid can flow in the flow-through groove 212 and directly contact the magnetic steel generating 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 groove 212 is designed at the tip of the eight character of each magnetic steel groove group 2, so that the flow-through groove 212 can fully utilize the space of the tip of the eight character of each magnetic steel groove group 2, thereby increasing the internal space of the flow-through groove 212, thereby increasing the total amount of cooling liquid flowing in the flow-through groove 212 per unit time, and further improving the cooling efficiency of the magnetic steel.

[0039] For the rotor punching sheet described above, the following structural changes can also be made:

[0040] The pair of first magnetic steel slots of each magnetic steel slot group 2 corresponding to the pointed end position of the eight-shaped structure is also provided with a through hole 22 suitable for the flow of cooling liquid; the through hole 22 is located between the flow-through slots 212 of the pair of first magnetic steel slots.

[0041] Based on the above structure, in an optional embodiment, 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, the adjacent through hole 22 and flow-through slot 212 can be adapted to the same cooling liquid inlet and the same cooling liquid outlet, and the side ends corresponding to the expansion part 213 and the through hole 22 are parallel to each other.

[0042] In addition, in order to effectively utilize the internal space of the through hole 22 to increase the total amount of cooling liquid that can pass through per unit time, the size of the through hole 22 along the symmetry axis 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 of the pair of first magnetic steel slots.

[0043] In summary, for the rotor lamination of this embodiment, direct heat exchange cooling of the magnetic steel by the cooling liquid can be achieved, thereby improving the cooling efficiency of the magnetic steel.

[0044] Embodiment 2:

[0045] Please refer to Figures 1 to 4 Based on the rotor lamination of embodiment 1, this embodiment provides a rotor core, which includes: a plurality of rotor laminations coaxially stacked as in embodiment 1 and magnetic steels arranged in each first magnetic steel slot; and for the plurality of stacked rotor laminations, there is a misalignment between the first magnetic steel slots of each adjacent two rotor laminations to form a rotor misalignment of the rotor core, thereby weakening the cogging torque and rotor fluctuation and improving the motor output performance.

[0046] Next, in terms of the design method of the misalignment between the first magnetic steel slots of adjacent rotor laminations, an optional case is described in detail with reference to the drawings:

[0047] First, 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 the pair of first magnetic steel slots corresponding to the magnetic steel slot. Based on this, when the rotor core of this embodiment is used in a specific rotor, the shaft hole 3 of the rotor lamination is assembled with the shaft, and for this, a key groove suitable for the insertion of the positioning key 4 is provided on the shaft.

[0048] 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 axis of the shaft hole 3 forms an acute angle α with the symmetry axis of the corresponding pair of first magnetic steel grooves. Based on this structure, when the two rotor laminations are stacked, as long as the rotor laminations are stacked in one positive and one negative manner, the first magnetic steel grooves of the adjacent two rotor laminations can be misaligned, so that the first magnetic steel grooves of each adjacent two rotor laminations form a misalignment angle of 2α. In this way, for the positioning keys 4 corresponding to different rotor laminations on the shaft, only one key groove is needed to adapt to the positioning keys 4 on multiple rotor laminations, which can meet the use requirements of the embodiment. Therefore, the rotor misalignment can be easily achieved by using the embodiment, so as to weaken the cogging torque and rotor fluctuation, and improve the motor output performance. 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 each adjacent two sections of rotor laminations are stacked in one positive and one negative manner to form a structure of rotor misalignment.

[0049] 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 arranged on the positioning key 4, the mark groove 41 is arranged 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 axis of the shaft hole 3. Based on this, when the front and back surfaces of the adjacent two rotor laminations are combined, the mark groove 41 on the corresponding positioning key 4 will form a left and right distribution state relative to the line connecting the center of the positioning key 4 and the axis of the shaft hole 3, so that when assembling the adjacent rotor laminations, the mark groove 41 only needs to be observed to quickly identify the front and back surfaces of the rotor laminations.

[0050] 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 axis of the shaft hole 3; the balance key 5 and the positioning key 4 are symmetrically arranged about the axis of the shaft hole 3. The balance key 5 plays a role of balancing the weight of the rotor lamination.

[0051] In addition, in an optional implementation, a pair of auxiliary grooves 7 corresponding to each magnetic steel groove and symmetrically arranged about the symmetry axis of the pair of first magnetic steel grooves included in the magnetic steel groove are arranged on the outer circular wall of the rotor lamination, which can eliminate high harmonics, reduce cogging torque, and improve motor NVH.

[0052] In summary, for the rotor core of the embodiment, the misalignment between the magnetic steel groove groups 2 on the adjacent rotor laminations makes the flow process of the cooling liquid flowing in the flow-through groove 212 of the first magnetic steel groove and the through hole 22 become tortuous, thereby increasing the contact area of the cooling liquid with the flow-through groove 212 and the through hole 22, improving the cooling efficiency of the rotor core, and optimizing the cooling effect.

[0053] The above detailed embodiments further explain the purpose, technical solutions and advantages 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.

[0054] In the description of the utility model, it should be understood that the terms indicating the orientation or position relationship are based on the orientation or position 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.

[0055] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements or the interaction relationship between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0056] In the description of the utility model, it should be pointed out that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship of the utility model product when it is usually placed, 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. In addition, the terms "first", "second", "third" and the like are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0057] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the parts 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.

[0058] In the utility model, unless another definite provision and limitation, first feature is on or under second feature can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but are in contact through other features between them. Moreover, first feature is on, above and on top of second feature includes that first feature is directly above and obliquely above second feature, or only indicates that the horizontal height of first feature is higher than second feature. First feature is under, below and under second feature includes that first feature is directly below and obliquely below second feature, or only indicates that the horizontal height of first feature is less than second feature.

Claims

1. A rotor lamination, characterized by The application relates to a rotor punching sheet for a motor, which comprises the following parts: a punching sheet body in a round sheet shape, an axle hole arranged on the punching sheet body, and an even number of magnetic steel slot groups which are spaced and uniformly distributed along the circumference of the axle hole; each magnetic steel slot group comprises at least a pair of first magnetic steel slots which are distributed in a splayed shape; each first magnetic steel slot comprises a receiving slot for accommodating a magnetic steel and a flow-through slot for flowing cooling liquid, and the flow-through slot is located at the tip of the splayed shape of each magnetic steel slot group; the slot width of the flow-through slot is at least twice the slot width of the receiving slot, and the slot length of the flow-through slot is 1 / 3-1 / 2 of the slot length of the receiving slot.

2. The rotor lamination of claim 1, wherein, each magnetic steel slot group is provided with a through hole corresponding to the tip position of the splayed shape and suitable for the flow of cooling liquid; the through hole is located between the flow-through slots of the pair of first magnetic steel slots.

3. The rotor lamination of claim 2, wherein, the cross section of the through hole is rectangular, and the flow-through slot comprises an expansion part with a rectangular cross section which is adjacent to the through hole.

4. The rotor lamination of claim 3, wherein, the side ends corresponding to the through hole of the expansion part are parallel to each other.

5. The rotor lamination of any of claims 2-4, wherein, the dimension of the through hole along the symmetry axis of the pair of first magnetic steel slots is not less than the dimension of the flow-through slot along the symmetry axis of the pair of first magnetic steel slots.

6. A rotor core characterized by, The application relates to a rotor punching sheet for a motor, which comprises the following parts: a plurality of rotor punching sheets as claimed in any one of claims 1-5 which are coaxially stacked, and magnetic steels arranged in each first magnetic steel slot; there is a misalignment between the first magnetic steel slots of each adjacent two rotor punching sheets.

7. The rotor core according to claim 6, characterized by the inner wall of the axle hole of each rotor punching sheet is provided with a positioning key which protrudes towards the axle center of the axle hole; the positioning key corresponds to a magnetic steel slot group, and the positioning key is located on the symmetry axis of the pair of first magnetic steel slots of the corresponding magnetic steel slot.

8. The rotor core according to claim 7, characterized by the positioning key is rectangular or semicircular; and the included angle between the line connecting the center of the positioning key and the axle center of the axle hole and the symmetry axis of the pair of first magnetic steel slots of the corresponding magnetic steel slot is an acute angle.

9. The rotor core according to claim 8, characterized by the positioning key is further provided with a mark groove; and the mark groove is offset to one side of the line connecting the center of the positioning key and the axle center of the axle hole.

10. The rotor core according to any one of claims 7 to 9, characterized by the inner wall of the axle hole of each rotor punching sheet is provided with a balance key which protrudes towards the axle center of the axle hole; the balance key and the positioning key are symmetrically arranged with the axle center of the axle hole.

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