Rotor punching sheet, rotor assembly, motor and vehicle

Abstract

The invention provides a rotor punching sheet, a rotor assembly, a motor and a vehicle, and relates to the technical field of vehicle parts, the rotor punching sheet is provided with a plurality of magnetic steel hole groups and a plurality of auxiliary holes, the magnetic steel hole groups comprise first magnetic steel hole groups, each first magnetic steel hole group comprises a first magnetic steel hole and a second magnetic steel hole, the first magnetic steel holes and the second magnetic steel holes extend in the direction from the center of the rotor punching sheet to the edge of the rotor punching sheet, first magnetic bridges are formed between the ends, close to the center of the rotor punching sheet, of the first magnetic steel holes and the second magnetic steel holes, and the auxiliary holes are formed in the first magnetic bridges. And the internal space of each auxiliary hole is sequentially divided into a plurality of hole sites along the radial direction of the rotor punching sheet, and each hole site is used as one of a magnetic steel hole, a cooling hole, a filling hole and a lightening hole. Therefore, the rotor punching sheet can be applied to motors with different torque requirements, cooling requirements and light weight, and is high in universality and flexibility.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle parts, and more particularly, to a rotor punching sheet, a rotor assembly, a motor and a vehicle. Background Art

[0002] As one of the core components of new energy vehicles, the performance of the drive motor directly affects the performance of the whole vehicle. Most of the drive motors of new energy vehicles on the market are permanent magnet synchronous motors. According to the arrangement form of permanent magnets, permanent magnet synchronous motors can be divided into surface-mounted type and interior-mounted type. Among them, the surface-mounted type means that the permanent magnets are directly attached to the surface of the rotor, and the interior-mounted type means that the permanent magnets are inserted inside the rotor core. Since the surface-mounted permanent magnet synchronous motor has poor field weakening speed increasing ability, when a large field weakening speed increasing ability is required, an interior-mounted permanent magnet synchronous motor is generally used.

[0003] Currently, when it is necessary to increase the torque of an interior-mounted permanent magnet synchronous motor, it is usually necessary to increase the rotor envelope and rotor length to increase the motor torque, resulting in the need to re-develop the rotor punching sheet, making the universality of the rotor punching sheet poor and the production cost high. Summary of the Invention

[0004] The problem to be solved by the present invention is: how to improve the universality of the rotor punching sheet.

[0005] To solve the above problems, the present invention provides a rotor punching sheet, a rotor assembly, a motor and a vehicle.

[0006] In a first aspect, the present invention provides a rotor punching sheet, on which there are provided a plurality of magnet hole groups and a plurality of auxiliary holes. The plurality of magnet hole groups and the plurality of auxiliary holes are both evenly distributed along the circumferential direction of the rotor punching sheet and are arranged in one-to-one correspondence. The magnet hole group includes a first magnet hole group, and each first magnet hole group includes a first magnet hole and a second magnet hole. In the direction from the center of the rotor punching sheet to the edge of the rotor punching sheet, the first magnet hole and the second magnet hole extend away from each other, and a first magnetic bridge is formed between the ends of the first magnet hole and the second magnet hole close to the center of the rotor punching sheet. The auxiliary hole is arranged at the corresponding first magnetic bridge, and the internal space of each auxiliary hole is sequentially divided into a plurality of hole positions along the radial direction of the rotor punching sheet, and each hole position is used as one of a magnet hole, a cooling hole, a filling hole and a weight reduction hole.

[0007] Optionally, the magnet hole group further includes a second magnet hole group, and the second magnet hole group is located on the side of the first magnet hole group close to the edge of the rotor punching sheet; each second magnet hole group includes a third magnet hole and a fourth magnet hole, and in the direction from the center of the rotor punching sheet to the edge of the rotor punching sheet, the third magnet hole and the fourth magnet hole extend away from each other.

[0008] Optionally, second magnetic bridges are respectively formed between the end portions of the first magnetic steel holes and the second magnetic steel holes close to the center of the rotor punching sheet and the auxiliary holes, and the thickness of the second magnetic bridges increases from the middle position to both end positions of the second magnetic bridges, wherein the thickness of the second magnetic bridges refers to the dimension of the second magnetic bridges in the circumferential direction of the rotor punching sheet.

[0009] Optionally, third magnetic bridges and fourth magnetic bridges are respectively formed between the end portions of the first magnetic steel holes and the second magnetic steel holes close to the edge of the rotor punching sheet and the edge of the rotor punching sheet, the thickness of the third magnetic bridges increases along a set direction, and the thickness of the fourth magnetic bridges decreases along the set direction; and / or,

[0010] Fifth magnetic bridges and sixth magnetic bridges are respectively formed between the end portions of the third magnetic steel holes and the fourth magnetic steel holes close to the edge of the rotor punching sheet and the edge of the rotor punching sheet, the thickness of the fifth magnetic bridges increases along the set direction, and the thickness of the sixth magnetic bridges decreases along the set direction;

[0011] Wherein, the thicknesses of the third magnetic bridges, the fourth magnetic bridges, the fifth magnetic bridges and the sixth magnetic bridges refer to the dimensions of the third magnetic bridges, the fourth magnetic bridges, the fifth magnetic bridges and the sixth magnetic bridges in the radial direction of the rotor punching sheet, and the set direction is opposite to the rotation direction of the rotor punching sheet.

[0012] Optionally, a plurality of air groove groups are further provided on the rotor punching sheet, the plurality of air groove groups are arranged in one-to-one correspondence with the plurality of magnetic steel hole groups, and the air groove groups are located between the first magnetic steel hole and the second magnetic steel hole of the corresponding magnetic steel hole group.

[0013] Optionally, the air groove group includes two first air grooves, the two first air grooves are arranged on the edge of the rotor punching sheet and respectively correspond to the positions of the first magnetic steel hole and the second magnetic steel hole;

[0014] and / or, the air groove group includes a second air groove, the second air groove is located on one side of the magnetic steel hole group close to the edge of the rotor punching sheet and is radially aligned with the first magnetic bridge along the rotor punching sheet.

[0015] In a second aspect, the present invention provides a rotor assembly, including a rotor core and a plurality of magnetic steel groups, the rotor core is formed by stacking a plurality of rotor punching sheets as described above, a plurality of magnetic steel groove groups are formed by the plurality of magnetic steel hole groups of the plurality of rotor punching sheets, and the magnetic steel groups are inserted into the corresponding magnetic steel groove groups.

[0016] Optionally, the magnet group includes a first magnet group, a second magnet group, and a third magnet group. The first magnet hole groups of the plurality of rotor punching sheets form a first magnet groove group, the second magnet hole groups of the plurality of rotor punching sheets form a second magnet groove group, the auxiliary holes of the plurality of rotor punching sheets form auxiliary grooves, and the hole positions of the auxiliary holes of the plurality of rotor punching sheets form groove positions. The first magnet group and the second magnet group are respectively inserted into the first magnet groove group and the second magnet groove group, and the third magnet group is inserted into one or more of the groove positions at the edge of the auxiliary groove close to the rotor core.

[0017] In a third aspect, the present invention provides a motor, including the rotor punching sheet as described above or the rotor assembly as described above.

[0018] In a third aspect, the present invention provides a vehicle, including the rotor punching sheet as described above, or the rotor assembly as described above, or the motor as described above.

[0019] The beneficial effects of the rotor punching sheet of the present invention are as follows: By arranging a plurality of first magnet holes groups evenly distributed along the circumferential direction of the rotor punching sheet, the uniformity of the magnetic field can be ensured, thereby reducing the torque ripple caused by the uneven magnetic field and improving the smooth operation of the motor. Moreover, by arranging the first magnet holes and the second magnet holes of the first magnet holes group at intervals in the circumferential direction of the rotor punching sheet and extending them away from each other in the direction from the center of the rotor punching sheet to the edge of the rotor punching sheet, the first magnet holes group as a whole is substantially in a V-shaped structure with an opening facing the edge of the rotor punching sheet, so as to facilitate guiding the magnetic force lines to pass through the air gap more evenly by using the magnet holes of the V-shaped structure, thereby reducing magnetic leakage and improving the effective utilization rate of the air gap magnetic density, and further increasing the power density of the motor. At the same time, by arranging auxiliary holes at the first magnetic bridge formed between the ends of the first magnet holes and the second magnet holes in each first magnet holes group close to the center of the rotor punching sheet, and dividing the internal space of each auxiliary hole into a plurality of hole positions in sequence along the radial direction of the rotor punching sheet, and each hole position can be used as one of a magnet hole, a cooling hole, a filling hole and a weight reduction hole. In this way, at least one hole position of each auxiliary hole can be used as a magnet hole to insert a magnet to increase the motor torque, so that the rotor punching sheet can be applied to motors with different torque requirements, and has high versatility and flexibility. At the same time, other hole positions of the auxiliary hole can be used as filling holes to fill molten injection molding materials, so as to use the solidified injection molding materials to fix the magnets in the auxiliary holes. Moreover, compared with the related art method of increasing the rotor envelope and rotor length to increase the motor torque, not only can the volume of the motor be reduced, but also there is no need to develop new rotor punching sheets additionally, thereby reducing the development cost and production line transformation cost. And, at least one hole position of the auxiliary hole can also be used as a cooling hole to circulate cooling oil to improve the cooling effect of the motor, and at least one hole position of each auxiliary hole can be used as a weight reduction hole to realize the lightweight design of the motor, so that the rotor punching sheet can be applied not only to motors with different torque requirements, but also to motors with different cooling requirements and different lightweight requirements, and has higher versatility and flexibility. In addition, by arranging the auxiliary holes at the first magnetic bridge, when the hole positions of the auxiliary holes are used as magnet holes to insert magnets, the magnetic leakage of the magnets in the first magnet holes group can be inhibited, thereby effectively reducing the magnetic leakage at the first magnetic bridge and increasing the motor torque. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the rotor punching sheet in the embodiment of the present invention;

[0021] Figure 2 It is a partial structural schematic diagram of the rotor punching sheet in the embodiment of the present invention;

[0022] Figure 3 It is a partial structural schematic diagram of the rotor punching sheet in the embodiment of the present invention;

[0023] Figure 4 Structural schematic diagram of the rotor core in the embodiment of the present invention;

[0024] Figure 5 Structural schematic diagram of the rotor assembly in the first embodiment of the present invention;

[0025] Figure 6 is Figure 5 Partial structural schematic diagram of the rotor assembly in

[0026] Figure 7 Partial structural schematic diagram of the rotor assembly in the second embodiment of the present invention;

[0027] Figure 8 Partial structural schematic diagram of the rotor assembly in the third embodiment of the present invention;

[0028] Figure 9 Partial structural schematic diagram of the rotor assembly in the fourth embodiment of the present invention.

[0029] Explanation of reference numerals:

[0030] 1, magnetic steel hole group; 11, first magnetic steel hole group; 111, first magnetic steel hole; 112, second magnetic steel hole; 12, second magnetic steel hole group; 121, third magnetic steel hole; 122, fourth magnetic steel hole; 2, auxiliary hole; 21, first hole position; 22, second hole position; 23, third hole position; 3, air groove group; 31, first air groove; 32, second air groove; b, second magnetic bridge; c, third magnetic bridge; d, fourth magnetic bridge; e, fifth magnetic bridge; f, sixth magnetic bridge; g, seventh magnetic bridge;

[0031] 40, rotor core; 41, first magnetic steel groove group; 42, second magnetic steel groove group; 43, auxiliary groove; 50, magnetic steel group; 51, first magnetic steel group; 52, second magnetic steel group; 53, third magnetic steel group; 60, injection molding material. Detailed embodiments

[0032] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention is given with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0033] As used herein, the term "comprising" and its variants are open-ended, that is, "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts such as "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0034] It should be noted that the modification of "one" and "multiple" mentioned in the present invention is illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly specified in the context, it should be understood as "one or more".

[0035] In the related art, the drive motors of most new energy vehicles on the market are permanent magnet synchronous motors. According to the arrangement form of the permanent magnets, the permanent magnet synchronous motors can be divided into surface-mounted type and interior-mounted type. Among them, the surface-mounted type means that the permanent magnets are directly attached to the rotor surface, and the interior-mounted type means that the permanent magnets are inserted inside the rotor core. Since the field weakening speed increasing ability of the surface-mounted permanent magnet synchronous motor is poor, when a large field weakening speed increasing ability is required, the interior-mounted permanent magnet synchronous motor is generally used. At present, when it is necessary to increase the torque of the interior-mounted permanent magnet synchronous motor, it is usually necessary to increase the rotor envelope and the rotor length to increase the motor torque, resulting in the need to re-develop the rotor punching sheet, making the universality of the rotor punching sheet poor and the production cost high.

[0036] It should be noted that field weakening speed increasing refers to increasing the speed of the motor under the condition of ensuring voltage balance by reducing the magnetic flux intensity of the permanent magnet synchronous motor.

[0037] In view of the problems existing in the above-mentioned related art, the present invention provides a rotor punching sheet, a rotor assembly, a motor and a vehicle.

[0038] Combined with Figure 1 、 Figure 2 、 Figures 6 to 9As shown in the figure, a rotor punching provided by an embodiment of the present invention is provided with a plurality of magnet steel hole groups 1 and a plurality of auxiliary holes 2. The plurality of magnet steel hole groups 1 and the plurality of auxiliary holes 2 are both evenly distributed along the circumferential direction of the rotor punching and are arranged in one-to-one correspondence. The magnet steel hole group 1 includes a first magnet steel hole group 11. Each first magnet steel hole group 11 includes a first magnet steel hole 111 and a second magnet steel hole 112. In the direction from the center of the rotor punching to the edge of the rotor punching, the first magnet steel hole 111 and the second magnet steel hole 112 extend away from each other. A first magnetic bridge is formed between the ends of the first magnet steel hole 111 and the second magnet steel hole 112 close to the center of the rotor punching. The auxiliary hole 2 is arranged at the corresponding first magnetic bridge, and the internal space of each auxiliary hole 2 is sequentially divided into a plurality of hole positions along the radial direction of the rotor punching. Each hole position is used as one of a magnet steel hole, a cooling hole, a filling hole, and a weight reduction hole.

[0039] Specifically, the rotor punching has a circular thin sheet structure. A shaft passing hole for the motor shaft to pass through is provided in the central part thereof. Moreover, the rotor punching is also provided with a plurality of magnet steel hole groups 1 and a plurality of auxiliary holes 2. The magnet steel hole group 1 is used for inserting magnet steel. The number of the magnet steel hole groups 1 and the auxiliary holes 2 is the same and they are arranged in one-to-one correspondence. At the same time, the plurality of magnet steel hole groups 1 are arranged at intervals along the circumferential direction of the rotor punching and are evenly distributed. The plurality of auxiliary holes 2 are also arranged at intervals along the circumferential direction of the rotor punching and are evenly distributed. A plurality of rotor punchings are stacked and press-fitted into a rotor core 40. At this time, one magnet steel hole group 1 of the plurality of rotor punchings is sequentially communicated and overlapped along the axial direction of the rotor core 40 to form a magnet steel groove group of the rotor core 40, and the plurality of magnet steel hole groups 1 of the plurality of rotor punchings form a plurality of magnet steel groove groups of the rotor core 40. Similarly, the plurality of first magnet steel hole groups 11 of the plurality of rotor punchings form a plurality of first magnet steel groove groups 41 of the rotor core 40, as Figure 4 shown. Each magnet steel hole group 1 includes a first magnet steel hole group 11. Each first magnet steel hole group 11 includes a first magnet steel hole 111 and a second magnet steel hole 112. In each first magnet steel hole group 11, the first magnet steel hole 111 and the second magnet steel hole 112 are arranged at intervals in the circumferential direction of the rotor punching, and the first magnet steel hole 111 and the second magnet steel hole 112 extend away from each other in the direction from the center of the rotor punching to the edge of the rotor punching. This makes the first magnet steel hole group 11 as a whole substantially in a V-shaped structure with an opening facing the edge of the rotor punching, and the two hypotenuses of the V-shaped structure are not connected. At the same time, a first magnetic bridge is formed between the ends of the first magnet steel hole 111 and the second magnet steel hole 112 close to the center of the rotor punching, and the auxiliary hole 2 is arranged at the corresponding first magnetic bridge, that is, the auxiliary hole 2 is arranged at the first magnetic bridge formed between the first magnet steel hole 111 and the second magnet steel hole 112 in the corresponding magnet steel hole group 1.

[0040] More specifically, the internal space of each auxiliary hole 2 is sequentially divided into a plurality of hole positions along the radial direction of the rotor punching, as Figure 2As shown, for the convenience of description, in this section and the following text, the internal space of each auxiliary hole 2 is sequentially divided into three hole positions, namely a first hole position 21, a second hole position 22, and a third hole position 23 along the radial direction of the rotor punching sheet, as an example for illustration. Each hole position of the auxiliary hole 2 can be selected as one of a magnet hole, a cooling hole, a filling hole, and a weight reduction hole according to the torque requirement, cooling requirement, and lightweight requirement of the motor. For example, when the torque requirement of the motor cannot be met after inserting magnets in each first magnet slot group 41 of the rotor core 40, at least one hole position of each auxiliary hole 2 can be used as a magnet hole to insert magnets to increase the motor torque. At this time, since molten injection molding material needs to be filled after inserting magnets in the auxiliary hole 2 to fix the magnets, other hole positions of the auxiliary hole 2 can be used as filling holes to fill the molten injection molding material, so as to use the solidified injection molding material to fix the magnets in the auxiliary hole 2; when the original cooling oil channels on the rotor core 40 cannot meet the cooling requirement of the motor, at least one hole position of the auxiliary hole 2 can be used as a cooling hole to circulate the cooling oil fluid to improve the cooling effect of the motor; when the weight of the rotor core 40 does not meet the lightweight requirement of the motor, at least one hole position of each auxiliary hole 2 can be used as a weight reduction hole to achieve a lightweight design of the motor. In addition, when inserting magnets in the auxiliary hole 2, if inserting magnets in the first hole position 21 of each auxiliary hole 2 (i.e., Figure 7 the third magnet group 53 in

[0041] can meet the torque increase requirement, the second hole position 22 of the auxiliary hole 2 can be used as a filling hole to fill the molten injection molding material. Moreover, the filling amount of the injection molding material can be designed according to the oil cooling and heat dissipation requirement of the rotor core 40. For example, if the original cooling oil circuit on the rotor core 40 cannot meet the heat dissipation requirement after adding the third magnet group 53, the third hole position 23 can be reserved as a cooling hole to improve the cooling effect. If the original cooling oil circuit on the rotor core 40 can meet the cooling requirement after adding the third magnet group 53, the remaining hole positions of the auxiliary hole 2 can be filled with the injection molding material, or a part of the hole positions can be reserved as weight reduction holes.

[0041] In this embodiment, multiple first magnet holes groups 11 evenly distributed in the circumferential direction of the rotor punching sheet can be arranged on the rotor punching sheet to ensure the uniformity of the magnetic field, thereby reducing the torque ripple caused by the uneven magnetic field and improving the smoothness of the motor operation. Moreover, by arranging the first magnet holes 111 and the second magnet holes 112 of the first magnet holes groups 11 at intervals in the circumferential direction of the rotor punching sheet and extending them away from each other in the direction from the center of the rotor punching sheet to the edge of the rotor punching sheet, the first magnet holes groups 11 are generally in a V-shaped structure with an opening facing the edge of the rotor punching sheet, so as to facilitate guiding the magnetic force lines to pass through the air gap more evenly by using the magnet holes of the V-shaped structure, thereby reducing magnetic leakage and improving the effective utilization rate of the air gap magnetic density, and further increasing the power density of the motor. At the same time, by arranging auxiliary holes 2 at the first magnetic bridges formed between the ends of the first magnet holes 111 and the second magnet holes 112 in each first magnet holes group 11 close to the center of the rotor punching sheet, and dividing the internal space of each auxiliary hole 2 into multiple hole positions in sequence along the radial direction of the rotor punching sheet, and each hole position can be used as one of a magnet hole, a cooling hole, a filling hole and a weight-reducing hole. In this way, at least one hole position of each auxiliary hole 2 can be used as a magnet hole to insert a magnet to increase the motor torque, so that the rotor punching sheet can be applied to motors with different torque requirements, and has high versatility and flexibility. At the same time, other hole positions of the auxiliary hole 2 can be used as filling holes to fill molten injection molding materials to fix the magnets in the auxiliary hole 2 by using the solidified injection molding materials. Moreover, compared with the method of increasing the rotor envelope and rotor length in the related art to increase the motor torque, the method of increasing the motor torque in this embodiment can not only reduce the volume of the motor, but also does not need to develop new rotor punching sheets additionally, thereby reducing the development cost and the production line transformation cost. And at least one hole position of the auxiliary hole 2 can also be used as a cooling hole to circulate cooling oil to improve the cooling effect of the motor, and at least one hole position of each auxiliary hole 2 can be used as a weight-reducing hole to realize the lightweight design of the motor, so that the rotor punching sheet can be applied to motors with different torque requirements, different cooling requirements and different lightweight requirements, and has higher versatility and flexibility. In addition, by arranging the auxiliary hole 2 at the first magnetic bridge, when the hole positions of the auxiliary hole 2 are used as magnet holes to insert magnets, the magnetic leakage of the magnets in the first magnet holes groups 11 can be inhibited, thereby effectively reducing the magnetic leakage at the first magnetic bridge and increasing the motor torque.

[0042] Further, as shown in combination with Figure 2 The auxiliary hole 2 is in a rectangular hole structure. With such a setting, on the one hand, it is convenient for processing and manufacturing, and on the other hand, it can ensure that each hole position of the auxiliary hole 2 can be used to insert a magnet, and further improve the flexibility of inserting a magnet in the auxiliary hole 2, so as to facilitate selecting an appropriate number of magnets according to the torque requirements of the motor and inserting them into the auxiliary hole 2.

[0043] Optionally, as shown in combination withFigure 1 and Figure 2 As shown in Figure 2 , the magnet hole group 1 further includes a second magnet hole group 12, and the second magnet hole group 12 is located on the side of the first magnet hole group 11 close to the edge of the rotor punching; each second magnet hole group 12 includes a third magnet hole 121 and a fourth magnet hole 122, and in the direction from the center of the rotor punching to the edge of the rotor punching, the third magnet hole 121 and the fourth magnet hole 122 extend away from each other.

[0044] In this way, by adding the second magnet hole group 12, the torque of the motor is improved; moreover, by arranging the third magnet hole 121 and the fourth magnet hole 122 of the second magnet hole group 12 to extend away from each other in the direction from the center of the rotor punching to the edge of the rotor punching, the second magnet hole group 12 also has a V-shaped magnet hole structure, so that the first magnet hole group 11 and the second magnet hole group 12 in a magnet hole group form a double V-shaped structure distributed radially. In this way, not only can the torque of the motor be improved while ensuring the structural strength of the rotor assembly, but also it helps to optimize the magnetic circuit, reduce the magnetic resistance, improve the utilization rate of the magnetic flux, thereby reducing the usage amount of the magnet, and further reducing the production cost while ensuring the performance of the motor. Specifically, the first magnet hole group 11 and the second magnet hole group 12 are symmetrically arranged with respect to the same radius of the rotor punching, that is, the first magnet hole 111 and the second magnet hole 112 are symmetrically arranged with respect to a radius of the rotor punching, and the third magnet hole 121 and the fourth magnet hole 122 are also symmetrically arranged with respect to the same radius. In addition, the included angle of the V shape formed by the third magnet hole 121 and the fourth magnet hole 122 is greater than the included angle of the V shape formed by the first magnet hole 111 and the second magnet hole 112.

[0045] In other embodiments, the second magnet hole group 12 can also be in a linear structure, and in application, a suitable arrangement form can be selected according to actual needs.

[0046] Optionally, as shown in Figure 3 Figure 3 , a second magnetic bridge b is formed between the ends of the first magnet hole 111 and the second magnet hole 112 close to the center of the rotor punching and the auxiliary hole 2 respectively, and the thickness of the second magnetic bridge b increases from the middle position of the second magnetic bridge b to both ends, where the thickness of the second magnetic bridge b refers to the dimension of the second magnetic bridge b in the circumferential direction of the rotor punching.

[0047] In this alternative embodiment, there is a spacing between the end of the first magnet hole 111 close to the center of the rotor punching and the auxiliary hole 2, and this spacing forms the second magnetic bridge b. There is also a spacing between the end of the second magnet hole 112 close to the center of the rotor punching and the auxiliary hole 2, and this spacing forms the second magnetic bridge b. Compared with designing the second magnetic bridge b to have a uniform thickness, in this embodiment, the thickness of the second magnetic bridge b is designed to increase from the middle position to both ends of the second magnetic bridge b, so as to improve the structural strength at the second magnetic bridge b while reducing magnetic leakage and increasing torque.

[0048] Optionally, as shown in Figure 3 There are third magnetic bridges c and fourth magnetic bridges d formed respectively between the end parts of the first magnet hole 111 and the second magnet hole 112 close to the edge of the rotor punching and the edge of the rotor punching. The thickness of the third magnetic bridge c increases along the set direction, and the thickness of the fourth magnetic bridge d decreases along the set direction; and / or, there are fifth magnetic bridges e and sixth magnetic bridges f formed respectively between the end parts of the third magnet hole 121 and the fourth magnet hole 122 close to the edge of the rotor punching and the edge of the rotor punching. The thickness of the fifth magnetic bridge e increases along the set direction, and the thickness of the sixth magnetic bridge f decreases along the set direction; wherein, the thicknesses of the third magnetic bridge c, the fourth magnetic bridge d, the fifth magnetic bridge e and the sixth magnetic bridge f refer to the dimensions of the third magnetic bridge c, the fourth magnetic bridge d, the fifth magnetic bridge e and the sixth magnetic bridge f in the radial direction of the rotor punching, and the set direction is opposite to the rotation direction of the rotor punching.

[0049] In this alternative embodiment, there is a spacing between the end of the first magnet hole 111 close to the edge of the rotor punching and the edge of the rotor punching, and this spacing forms the third magnetic bridge c. There is also a spacing between the end of the second magnet hole 112 close to the edge of the rotor punching and the edge of the rotor punching, and this spacing forms the fourth magnetic bridge d. Compared with designing the third magnetic bridge c and the fourth magnetic bridge d to have a uniform thickness, by designing the thickness of the third magnetic bridge c to increase in the direction opposite to the rotation direction of the rotor punching, that is, to decrease along the rotation direction of the rotor punching, and designing the thickness of the fourth magnetic bridge d to decrease in the direction opposite to the rotation direction of the rotor punching, that is, to increase along the rotation direction of the rotor punching, so as to improve the structural strength at the third magnetic bridge c and the fourth magnetic bridge d while reducing magnetic leakage and increasing torque. Similarly, by designing the thickness of the fifth magnetic bridge e to increase in the direction opposite to the rotation direction of the rotor punching, that is, to decrease along the rotation direction of the rotor punching, and designing the thickness of the sixth magnetic bridge f to decrease in the direction opposite to the rotation direction of the rotor punching, that is, to increase along the rotation direction of the rotor punching, so as to improve the structural strength at the fifth magnetic bridge e and the sixth magnetic bridge f while reducing magnetic leakage and increasing torque.

[0050] Furthermore, as shown in Figure 3As shown, a seventh magnetic bridge g is formed between the ends of the third magnet hole 121 and the fourth magnet hole 122 close to the center of the rotor punching. The thickness of the seventh magnetic bridge g increases from the middle position to the two end positions of the seventh magnetic bridge g. Herein, the thickness of the seventh magnetic bridge g refers to the dimension of the seventh magnetic bridge g in the circumferential direction of the rotor punching.

[0051] In this embodiment, there is a spacing between the ends of the third magnet hole 121 and the fourth magnet hole 122 close to the center of the rotor punching, and this spacing forms the seventh magnetic bridge g. Compared with designing the seventh magnetic bridge g to have a uniform thickness, in this embodiment, by designing the thickness of the seventh magnetic bridge g to increase from the middle position to the two end positions of the seventh magnetic bridge g, the leakage magnetic flux can be reduced, the torque can be increased, and the structural strength at the seventh magnetic bridge g can be improved simultaneously.

[0052] Optionally, in combination with Figure 1 and Figure 2 As shown, a plurality of air groove groups 3 are further provided on the rotor punching. The plurality of air groove groups 3 are arranged in one-to-one correspondence with the plurality of magnet hole groups 1, and the air groove group 3 is located between the first magnet hole 111 and the second magnet hole 112 of the corresponding magnet hole group 1. Specifically, in the circumferential direction of the rotor punching, the air groove group 3 is located between the first magnet hole 111 and the second magnet hole 112. The air groove group 3 can be composed of one or more air grooves. The opening area of this air groove is usually relatively small, and there is no need to fill cooling medium and injection molding material in the groove. In this way, the air groove group 3 can be used to optimize the back electromotive force waveform of the motor, so as to reduce the torque fluctuation of the motor and improve the motor performance.

[0053] Optionally, in combination with Figure 1 and Figure 2 As shown, the air groove group 3 includes two first air grooves 31. The two first air grooves 31 are arranged on the edge of the rotor punching and correspond to the positions of the first magnet hole 111 and the second magnet hole 112 respectively; and / or, the air groove group 3 includes a second air groove 32. The second air groove 32 is located on the side of the magnet hole group 1 close to the edge of the rotor punching and is aligned with the first magnetic bridge in the radial direction of the rotor punching.

[0054] Specifically, in the circumferential direction of the rotor punching, the air groove group 3 is located between the first magnet hole 111 and the second magnet hole 112, that is, both the first air groove 31 and the second air groove 32 are opened at the opening of the V-shaped first magnet groove group 41. Further, when the magnet hole group 1 further includes a second magnet hole group 12, the air groove group 3 is also located at the opening of the V-shaped second magnet groove group 42; the two first air grooves 31 correspond to the positions of the first magnet hole 111 and the second magnet hole 112 respectively, that is, the two first air grooves 31 are respectively close to the first magnet hole 111 and the second magnet hole 112; for example, in the radial direction of the rotor punching, the two first air grooves 31 can be respectively aligned with the third magnet hole 121 and the fourth magnet hole 122 of the second magnet hole group 12.

[0055] In this optional embodiment, each air groove group 3 may be composed of two first air grooves 31 and / or one second air groove 32. Among them, the first air groove 31 may be an arc-shaped notch structure provided on the edge of the rotor punching sheet. The second air groove 32 is located between the two first air grooves 31 and may be a triangular through-hole structure. Moreover, rounded corners are formed at the connection positions of the two groove walls of the second air groove 32. In this way, the structures of the first air groove 31 and the second air groove 32 are simplified, facilitating processing and manufacturing. Furthermore, both the first air groove 31 and the second air groove 32 are provided at the openings of the first magnet groove group 41 and the second magnet groove group 42 in a V shape, and the first air groove 31 is located on the edge of the rotor core 40. In this way, the air-gap permeance is changed by using the first air groove 31 and / or the second air groove 32, the magnetic field waveform is optimized, and the electromagnetic force and torque fluctuation are reduced.

[0056] Combined with Figure 4 and Figure 5 As shown, a rotor assembly provided by an embodiment of the present invention includes a rotor core 40 and a plurality of magnet groups 50. The rotor core 40 is formed by stacking a plurality of rotor punching sheets as described above. A plurality of magnet hole groups 1 of the plurality of rotor punching sheets form a plurality of magnet groove groups, and the magnet groups 50 are inserted into the corresponding magnet groove groups.

[0057] In this embodiment, a plurality of magnet groove groups on the rotor core 40 are arranged in one-to-one correspondence with a plurality of magnet groups 50. Each magnet group 50 is inserted into the magnet groove of the corresponding magnet groove group. Moreover, after inserting a magnet into each magnet groove, it is necessary to fill the gap between the magnet and the magnet groove with molten injection molding material to fix the magnet in the magnet groove. In addition, the beneficial effects of the rotor assembly in this embodiment are the same as those of the above-mentioned rotor punching sheet, which will not be elaborated here.

[0058] Optionally, combined with Figures 8 to 9 As shown, the magnet group 50 includes a first magnet group 51, a second magnet group 52, and a third magnet group 53. The first magnet hole groups 11 of the plurality of rotor punching sheets form a first magnet groove group 41, the second magnet hole groups 12 of the plurality of rotor punching sheets form a second magnet groove group 42, the auxiliary holes 2 of the plurality of rotor punching sheets form an auxiliary groove 43, and the hole positions of the auxiliary holes 2 of the plurality of rotor punching sheets form groove positions. The first magnet group 51 and the second magnet group 52 are respectively inserted into the first magnet groove group 41 and the second magnet groove group 42, and the third magnet group 53 is inserted into one or more groove positions of the auxiliary groove 43 close to the edge of the rotor core 40.

[0059] In this alternative embodiment, the magnet slots on the rotor core 40 include a first magnet slot group 41, a second magnet slot group 42, and an auxiliary slot 43. Among them, the first magnet slot group 41 is formed by the first magnet hole groups 11 of multiple stacked rotor punching sheets, the second magnet slot group 42 is formed by the second magnet hole groups 12 of multiple stacked rotor punching sheets, and the auxiliary slot 43 is formed by the auxiliary holes 2 of multiple stacked rotor punching sheets. Moreover, the first magnet group 51 includes two first magnets, the second magnet group 52 includes two second magnets, the third magnet group includes one or more third magnets. The two first magnets are respectively inserted into the two magnet slots of the first magnet slot group 41, the two second magnets are respectively inserted into the two magnet slots of the second magnet slot group 42, and the third magnet is inserted into the slot position of the auxiliary slot 43. In this way, by inserting the third magnet group 53 into the auxiliary slot 43 to increase the motor torque, the rotor core 40 can be applied to motors that require a relatively large torque.

[0060] In addition, one or more third magnets can be inserted into each auxiliary slot 43 according to the specific torque increase requirements of the motor. For example, when inserting one third magnet into each auxiliary slot 43 can meet the torque increase requirements, as Figure 7 shown, the third magnet can be arranged in the slot position (i.e., the first slot corresponding to the first hole 21) near the edge of the rotor core 40 in the auxiliary slot 43. At this time, the second slot (i.e., the slot corresponding to the second hole 22) of the auxiliary slot 43 can be used to fill the injection molding material, and the filling amount of the injection molding material can be designed according to the oil cooling and heat dissipation requirements of the rotor core 40. For example, if the original cooling oil passage on the rotor core 40 cannot meet the heat dissipation requirements after adding the third magnet group 53, a part of the auxiliary slot 43 can be reserved as a cooling channel to improve the cooling effect. If the original cooling oil passage on the rotor core 40 can meet the cooling requirements after adding the third magnet group 53, the remaining space of the auxiliary slot 43 can be filled with the injection molding material, or a part of the auxiliary slot 43 can be reserved as a weight reduction hole. When two third magnets need to be inserted into each auxiliary slot 43 to meet the torque increase requirements, as Figure 8 shown, the two third magnets can be arranged in the two slot positions (i.e., the first slot corresponding to the first hole 21 and the second slot corresponding to the second hole 22) near the edge of the rotor core 40 in the auxiliary slot 43. At this time, the third slot (i.e., the slot corresponding to the third hole 23) of the auxiliary slot 43 can be used to fill the injection molding material, and the filling amount of the injection molding material can also be designed according to the oil cooling and heat dissipation requirements of the rotor core 40, which will not be elaborated here. Compared with inserting the third magnet group 53 into the slot position near the center of the rotor core 40 in the auxiliary slot 43, inserting the third magnet group 53 into one or more slot positions near the edge of the rotor core 40 in the auxiliary slot 43 can increase the amplitude of the motor torque increase, thereby better improving the motor torque.

[0061] A motor provided by an embodiment of the present invention includes the rotor punching sheet or the rotor assembly as described above.

[0062] The beneficial effects of the motor in this embodiment are the same as those of the above-mentioned rotor punching sheet, and will not be elaborated here.

[0063] A vehicle provided by an embodiment of the present invention includes the rotor punching sheet or the rotor assembly or the motor as described above.

[0064] The beneficial effects of the vehicle in this embodiment are the same as those of the above-mentioned rotor punching sheet, and will not be elaborated here.

[0065] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. A rotor punching sheet, characterized in that, It is provided with a plurality of magnet steel hole groups (1) and a plurality of auxiliary holes (2). The plurality of magnet steel hole groups (1) and the plurality of auxiliary holes (2) are both evenly distributed along the circumferential direction of the rotor punching sheet and are arranged in one-to-one correspondence. The magnet steel hole group (1) includes a first magnet steel hole group (11). Each first magnet steel hole group (11) includes a first magnet steel hole (111) and a second magnet steel hole (112). In the direction from the center of the rotor punching sheet to the edge of the rotor punching sheet, the first magnet steel hole (111) and the second magnet steel hole (112) extend away from each other. A first magnetic bridge is formed between the ends of the first magnet steel hole (111) and the second magnet steel hole (112) close to the center of the rotor punching sheet. The auxiliary hole (2) is arranged at the corresponding first magnetic bridge, and the internal space of each auxiliary hole (2) is sequentially divided into a plurality of hole positions along the radial direction of the rotor punching sheet. Each hole position is used as one of a magnet steel hole, a cooling hole, a filling hole, and a weight reduction hole.

2. The rotor punching sheet according to claim 1, wherein The magnet steel hole group (1) further includes a second magnet steel hole group (12). The second magnet steel hole group (12) is located on the side of the first magnet steel hole group (11) close to the edge of the rotor punching sheet; each second magnet steel hole group (12) includes a third magnet steel hole (121) and a fourth magnet steel hole (122). In the direction from the center of the rotor punching sheet to the edge of the rotor punching sheet, the third magnet steel hole (121) and the fourth magnet steel hole (122) extend away from each other.

3. The rotor punching sheet according to claim 1, characterized in that, Second magnetic bridges (b) are formed between the ends of the first magnet steel hole (111) and the second magnet steel hole (112) close to the center of the rotor punching sheet and the auxiliary hole (2) respectively. The thickness of the second magnetic bridge (b) increases from the middle position of the second magnetic bridge (b) to both ends. Herein, the thickness of the second magnetic bridge (b) refers to the dimension of the second magnetic bridge (b) in the circumferential direction of the rotor punching sheet.

4. The rotor punching sheet according to claim 2, characterized in that, Third magnetic bridges (c) and fourth magnetic bridges (d) are formed between the ends of the first magnet steel hole (111) and the second magnet steel hole (112) close to the edge of the rotor punching sheet and the edge of the rotor punching sheet respectively. The thickness of the third magnetic bridge (c) increases along a set direction, and the thickness of the fourth magnetic bridge (d) decreases along the set direction; and / or, Fifth magnetic bridges (e) and sixth magnetic bridges (f) are formed between the ends of the third magnet steel hole (121) and the fourth magnet steel hole (122) close to the edge of the rotor punching sheet and the edge of the rotor punching sheet respectively. The thickness of the fifth magnetic bridge increases along the set direction, and the thickness of the sixth magnetic bridge decreases along the set direction; Wherein, the thicknesses of the third magnetic bridge (c), the fourth magnetic bridge (d), the fifth magnetic bridge (e), and the sixth magnetic bridge (f) refer to the dimensions of the third magnetic bridge (c), the fourth magnetic bridge (d), the fifth magnetic bridge (e), and the sixth magnetic bridge (f) in the radial direction of the rotor punching sheet. The set direction is opposite to the rotation direction of the rotor punching sheet.

5. The rotor punching sheet according to claim 1, wherein, The rotor punching sheet is further provided with a plurality of air groove groups (3), the plurality of air groove groups (3) are arranged in one-to-one correspondence with the plurality of magnet hole groups (1), and the air groove group (3) is located between the first magnet hole (111) and the second magnet hole (112) of the corresponding magnet hole group (1).

6. The rotor punching sheet according to claim 5, wherein, The air groove group (3) includes two first air grooves (31), and the two first air grooves (31) are arranged on the edge of the rotor punching sheet and correspond to the positions of the first magnet hole (111) and the second magnet hole (112) respectively and / or, the air groove group (3) includes a second air groove (32), the second air groove (32) is located on one side of the magnet hole group (1) close to the edge of the rotor punching sheet, and is aligned with the first magnetic bridge along the radial direction of the rotor punching sheet.

7. A rotor assembly, characterized in that, It includes a rotor core (40) and a plurality of magnet groups (50), the rotor core (40) is formed by stacking a plurality of rotor punching sheets as described in any one of claims 1-6, and the plurality of magnet hole groups (1) of the plurality of rotor punching sheets form a plurality of magnet groove groups, and the magnet groups (50) are inserted into the corresponding magnet groove groups.

8. The rotor assembly according to claim 7, wherein The magnet group (50) includes a first magnet group (51), a second magnet group (52) and a third magnet group (53), the first magnet hole groups (11) of the plurality of rotor punching sheets form a first magnet groove group (41), the second magnet hole groups (12) of the plurality of rotor punching sheets form a second magnet groove group (42), the auxiliary holes (2) of the plurality of rotor punching sheets form auxiliary grooves (43), the hole positions of the auxiliary holes (2) of the plurality of rotor punching sheets form groove positions, the first magnet group (51) and the second magnet group (52) are respectively inserted into the first magnet groove group (41) and the second magnet groove group (42), and the third magnet group (53) is inserted into one or more of the groove positions close to the edge of the rotor core (40) of the auxiliary groove (43).

9. A motor, characterized in that, It includes the rotor punching sheet as described in any one of claims 1-6 or the rotor assembly as described in claim 7 or 8.

10. A vehicle, characterized in that, It includes the rotor punching sheet as described in any one of claims 1-6 or the rotor assembly as described in claim 7 or 8 or the motor as described in claim 9.

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