Rotor core, rotor, electric machine, and vehicle

Abstract

This invention provides a rotor core, a rotor, a motor, and a vehicle. The rotor core is used to mount magnets and includes: multiple laminations stacked on top of each other, each lamination having a magnet slot; corresponding magnet slots on the stacked laminations defining a magnet cavity for mounting magnets; and multiple springs located within the magnet cavity. When a magnet is inserted into the magnet cavity, the springs deform under the pressure of the magnet and come into contact with it, thereby generating a compressive force on the magnet. Along the length of the magnet slot, each spring has a first end and a second end. The first end of the spring is located on the side of the spring facing the center of the lamination, and the height of the second end of the spring is less than the height of the first end. By setting the springs to have different heights at both ends, the positions of the multiple magnets can be made more consistent, solving the problem of random and inconsistent magnet positions within the magnet slots due to assembly issues.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and more specifically, to a rotor core, a rotor, an electric motor, and a vehicle. Background Technology

[0002] An electric motor consists of a rotor core and magnets. The magnets are installed in the rotor core. Common technologies for fixing magnets include surface-mount bonding, potting with adhesive to encapsulate the magnets into slots, and injection molding. However, these methods involve complex production processes and have low production efficiency. Motors that use spring clips to fix magnets suffer from inconsistent magnet placement, which negatively impacts motor performance. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] Therefore, the first objective of this invention is to provide a rotor core.

[0005] The second objective of this invention is to provide a rotor.

[0006] The third objective of this invention is to provide an electric motor.

[0007] The fourth objective of this invention is to provide a vehicle.

[0008] To achieve at least one of the above objectives, according to a first aspect of the present invention, a rotor core is provided for mounting a magnet. The rotor core includes: a plurality of laminations stacked together, each lamination having a magnet slot; the plurality of corresponding magnet slots on the stacked laminations defining a magnet cavity for mounting a magnet; and a plurality of springs located within the magnet cavity. When a magnet is inserted into the magnet cavity, the springs deform under the compression of the magnet and come into contact with the magnet, thereby generating a compressive force on the magnet. The springs have a first end and a second end along the length of the magnet slots, the first end of the spring being located on the side of the second end of the spring facing the center of the lamination, and the height of the second end of the spring being less than the height of the first end of the spring.

[0009] The rotor core proposed in this application can be used in the rotor of an electric motor to mount magnets. The rotor core includes multiple laminations stacked together to form the core. Each lamination has magnet slots. When multiple laminations are stacked, the magnet slots on the laminations align and collectively define a magnet cavity, within which a magnet can be mounted. The number of magnet slots on the laminations is multiple, thus forming multiple magnet cavities in the rotor core, each capable of accommodating multiple magnets.

[0010] Furthermore, to position the magnet, this application also includes spring plates within the rotor core. These spring plates are located within the magnet cavity, which contains multiple spring plates protruding from the cavity wall. During the insertion of the magnet into the magnet cavity, the magnet compresses the spring plates, causing them to deform. The deformed spring plates then adhere tightly to the magnet, generating a compressive force. In this way, the spring plates can limit the magnet's movement, preventing it from detaching from the magnet cavity.

[0011] Furthermore, the shape of the spring is defined, and the spring proposed in this application has different heights at both ends to generate different compressive forces on both ends of the magnet. Specifically, along the length direction of the magnet groove, the spring has a first end and a second end. The first end of the spring is located on the side of the second end of the spring that faces the center of the punch, that is, the first end of the spring is located inside the second end of the spring, and the height of the second end of the spring is less than the height of the first end of the spring.

[0012] Understandably, when the two ends of the spring are at different heights, the compressive forces exerted on the magnet by the first and second ends of the spring are different; the compressive force exerted by the second end of the spring on the magnet is less than the compressive force exerted by the first end of the spring on the spring. When the rotor rotates, the magnet tends to move relative to the spring under the action of centrifugal force, generating friction between the magnet and the spring. Since the compressive force exerted by the second end of the spring on the magnet is less than the compressive force exerted by the first end of the spring on the spring, the friction between the second end of the spring and the magnet is also less than the friction between the first end of the spring and the magnet. As the rotor speed increases, the centrifugal force on the magnet gradually increases. When the centrifugal force on the magnet exceeds the friction between the spring and the magnet, the end of the magnet with less friction (i.e., the end closer to the second end of the spring) will first oscillate, and then the magnet will slide into the magnet slot at the end away from the center of the rotor core.

[0013] By setting the spring clips to have different heights at both ends, multiple magnets can be moved to the end of the magnet slot furthest from the center of the rotor core, making the positions of the magnets more consistent. This solves the problem of random and inconsistent magnet positions within the magnet slots caused by assembly issues, resulting in more uniform and stable weight distribution across the rotor core with the magnets installed. This improves the stability of rotor core rotation and enhances motor performance. Furthermore, using spring clips to position the magnets within the rotor core reduces production steps such as pasting, potting, and injection molding of magnets, simplifying the production process and effectively improving automation levels.

[0014] Furthermore, the spring can be an overall structure that is approximately trapezoidal, or it can be a regular structure such as a rectangle, triangle, or arc. The top of the spring can be an arc, or it can be other irregular shapes.

[0015] The rotor core of the present invention, as described above, may also have the following distinguishing technical features:

[0016] In some technical solutions, optionally, the magnet slot includes: a slot body for accommodating a magnet, wherein the slot walls at both ends of the slot body can fit against the magnet; wherein the width of the slot body is W, the width of the spring piece is W1, and W and W1 satisfy W1≤2 / 3×W; the height of the slot body is H, and the height of the first end of the spring piece is H1, and H and H1 satisfy H1≤H.

[0017] In this technical solution, the structure of the magnet slot is defined. The magnet slot includes a slot body for accommodating the magnet. When the magnet is installed in the magnet slot, the magnet is in contact with the slot walls at both ends of the slot body. The width of the slot body is W, and the width of the spring piece is W1, where W and W1 satisfy W1 ≤ 2 / 3 × W. Optionally, W1 = 1 / (N1 + 1)W, where N1 is a positive integer. In one possible technical solution, N1 is 1, and W1 = 1 / 2W.

[0018] Furthermore, the height of the groove body is H, and the height of the first end of the spring piece is H1, where H and H1 satisfy H1≤H. Optionally, H1=1 / (N2+1)H, where N2 is a positive integer. In one possible technical solution, N2 is 3, i.e., H1=1 / 4H.

[0019] By limiting the dimensional relationship between the spring and the mounting slot as described above, we can ensure that the size of the spring meets the strength requirements of the spring, so that the spring can provide sufficient compressive force to the magnet and keep the magnet stable. On the other hand, we can avoid the problem of difficult magnet installation caused by excessive strength of the spring.

[0020] In some technical solutions, optionally, W1 also satisfies W1≤6mm and H1 also satisfies H1≤1.85mm.

[0021] In this technical solution, the height and width of the spring are defined. Specifically, the height of the first end of the spring is H1, where H1 ≤ 1.85 mm, and the width of the spring is W1, where W1 ≤ 6 mm. This ensures that the strength of the spring meets the usage requirements, preventing it from breaking under pressure, and also prevents excessive stress that makes it difficult to bend and deform, allowing the magnet to be inserted more easily into the first magnet slot.

[0022] In one possible technical solution, the height H1 of the first end of the spring is 0.9 mm, and the width W1 of the spring is 3.2 mm.

[0023] In some technical solutions, optionally, the multiple laminations include: a first lamination, wherein a magnet slot is provided on the first lamination as a first magnet slot, and a spring piece is provided on the slot wall of the first magnet slot; a second lamination, wherein a magnet slot is provided on the second lamination as a second magnet slot, and a first clearance opening is provided on the second magnet slot for clearing the spring piece, and the multiple second laminations and the multiple first laminations are stacked at intervals.

[0024] In this technical solution, one structure of the rotor core is defined, in which spring pieces are disposed on some of the laminations. There are multiple laminations, including first laminations and second laminations. The magnet slot on the first lamination is called the first magnet slot, and the spring piece is disposed on the slot wall of the first magnet slot. The magnet slot on the second lamination is called the second magnet slot, and the second magnet slot has a clearance opening for accommodating the spring piece. Multiple second laminations and multiple first laminations are stacked alternately. When a magnet is inserted into the first magnet slot and compresses the spring piece, causing it to deform, the deformed spring piece bends and inserts into the clearance opening on the second lamination, allowing the magnet to smoothly insert into the first magnet slot.

[0025] Specifically, multiple second magnet slots are arranged in a one-to-one correspondence with multiple first magnet slots. The first magnet slots on the first laminations and the corresponding second magnet slots on the second laminations together define the magnet cavity. When the magnet is installed in the rotor core, the magnet is inserted into the first magnet slot and the second magnet slot. One or more second laminations are provided between any two adjacent first laminations. When the spring is deformed by the magnet, the spring bends and inserts into the first clearance slot on the adjacent second lamination. This provides deformation space for the spring, allowing it to be deformed normally, and prevents interference between the deformed spring and the magnet, allowing the magnet to be smoothly inserted into the first magnet slot and the second magnet slot.

[0026] The first clearance opening can be rectangular, trapezoidal, or arc-shaped.

[0027] In some technical solutions, optionally, the width of the spring is W1, the width of the first clearance opening is W2, and W1 and W2 satisfy W2≥W1; the depth of the first clearance opening is H2, and the thickness of the spring is H3, and H2 and H3 satisfy H2≥H3.

[0028] In this technical solution, the dimensional relationship between the spring and the first clearance opening is defined. Specifically, the width of the spring is W1, and the width of the first clearance opening is W2, where W1 and W2 satisfy W2 ≥ W1. Understandably, when the spring deforms, it inserts into the first clearance opening. If the width of the first clearance opening is less than the width of the spring, the spring will be unable to insert into the first clearance opening. Therefore, this application sets the width W2 of the first clearance opening to be greater than or equal to the width W1 of the spring, so that the spring can be inserted into the first clearance opening.

[0029] Furthermore, the depth of the first clearance opening is H2, and the thickness of the spring piece is H3. The thickness of the spring piece is the same as the thickness of the first punch piece, and H2 and H3 satisfy H2≥H3. Understandably, if the thickness of the spring piece is greater than the depth of the first clearance opening when it is inserted, part of the spring piece will be outside the first clearance opening, which may easily lead to interference between the spring piece and the magnet. Therefore, this application sets the depth H2 of the first clearance opening to be greater than or equal to the thickness H3 of the spring piece, so that the spring piece can be inserted into the first clearance opening.

[0030] In some technical solutions, optionally, the height of the first end of the spring is H1, the thickness of the second punch is H4, and the number of second punches between two adjacent first punches is N3, where H1, H4 and N3 satisfy N3×H4≥H1.

[0031] In this technical solution, the relationship between the height of the spring piece and the thickness and number of the second laminations is defined. Specifically, the height of the first end of the spring piece is H1, the thickness of the second laminations is H4, and the number of second laminations between two adjacent first laminations is N3. H1, H4, and N3 satisfy N3×H4≥H1. Understandably, when there are multiple second laminations between two adjacent first laminations, the first clearance openings of the multiple second laminations collectively define a space for accommodating the spring piece. After being compressed, the spring piece bends and moves into the space defined by the multiple first clearance openings. By defining N3×H4≥H1, the common thickness of the multiple first clearance openings can meet the height requirement of the spring piece, ensuring that the spring piece is completely located within the space defined by the multiple first clearance openings, providing sufficient deformation space for the spring piece.

[0032] In some technical solutions, optionally, there are multiple first magnet slots, including first sub-magnet slots and second sub-magnet slots. Along the direction perpendicular to the adjacent first lamination, the projected area of ​​the second sub-magnet slot is smaller than the projected area of ​​the first sub-magnet slot, and the number of spring pieces disposed in the second sub-magnet slot is smaller than the number of spring pieces disposed in the first sub-magnet slot.

[0033] In this technical solution, the first magnet slot is further defined. There are multiple first magnet slots, including multiple first sub-magnet slots and multiple second sub-magnet slots, each with different dimensions, used to accommodate magnets of different sizes. Specifically, along the direction perpendicular to the adjacent first lamination, the projected area of ​​the second sub-magnet slot is smaller than the projected area of ​​the first sub-magnet slot, and the size of the magnet accommodated in the second sub-magnet slot is smaller than the size of the magnet accommodated in the first sub-magnet slot. Understandably, the larger the size of the magnet, the greater the compressive force required from the spring clips to fix the magnet. Therefore, this application limits the number of spring clips on the first and second sub-magnet slots as follows: the number of spring clips in the second sub-magnet slot is less than the number of spring clips in the first sub-magnet slot. This ensures that the compressive force on the magnet installed in the first sub-magnet slot is greater than the compressive force on the magnet installed in the second sub-magnet slot, so that the force on the magnet matches the volume of the magnet, keeping the magnet stable.

[0034] In some technical solutions, optionally, at least two spring clips are provided on the wall of the first sub-magnet slot.

[0035] In this technical solution, the number of spring pieces disposed in the first sub-magnet slot is limited. Specifically, at least two spring pieces are disposed on the slot wall of the first sub-magnet slot. Understandably, the first sub-magnet slot is used to accommodate a large magnet, and in order to prevent the magnet from detaching from the first sub-magnet slot, a greater compressive force needs to be applied to the magnet. By providing at least two spring pieces on the slot wall of the first sub-magnet slot, the compressive force on the magnet can be increased, thereby improving the stability of the magnet.

[0036] Among them, at least two spring pieces can be sequentially arranged on one groove wall along the edge of the first sub-magnet groove, or they can be arranged oppositely on two groove walls of the first sub-magnet groove.

[0037] In some technical solutions, the spring sheet and the first stamping sheet can be integrally formed.

[0038] In this technical solution, the structure of the spring and the first stamping body is defined. Specifically, the spring and the first stamping body are integrally formed. The first stamping body can be made of metal sheet, and the spring is integrally formed with the first stamping body by stamping. In this way, on the one hand, the connection strength between the spring and the first stamping body can be improved, reducing the possibility of the spring falling off; on the other hand, the processing of the first stamping body is simplified, and the processing cost of the first stamping body is reduced.

[0039] In some technical solutions, the rotor core may optionally include: multiple spring plates, which are correspondingly arranged with multiple magnet cavities. The two ends of the spring plates are respectively connected to the laminations at the top and bottom of the rotor core. At least a portion of the spring plate is inserted into the corresponding magnet cavity. Springs are disposed on the spring plates. Multiple springs are arranged sequentially along the length of the spring plates to form a spring plate group. The spring plate has at least one spring plate group.

[0040] In this technical solution, a different rotor core structure is defined, in which spring plates are disposed on spring plate surfaces. The rotor core includes multiple spring plate surfaces, the number of which is the same as the number of magnet cavities, and they are arranged in a one-to-one correspondence. At least a portion of the spring plate is inserted into the corresponding magnet cavity. The spring plate is disposed on the portion of the spring plate inserted into the magnet cavity to compress and position the magnet. Specifically, both ends of the spring plate are connected to the laminations at the top and bottom of the rotor core, respectively, to fix the spring plate. The spring plates are arranged in an array on the spring plate, and multiple spring plates are arranged sequentially along the length direction of the spring plate to form a spring plate group. The spring plate has at least one spring plate group. When there are multiple spring plate groups, the multiple spring plate groups are arranged sequentially along the width direction of the spring plate.

[0041] By setting a spring plate in the rotor core and placing the springs on the spring plate, multiple springs can be processed together during the processing of the spring plate, eliminating the need to process each spring individually during the stamping process, thus improving production efficiency.

[0042] In some technical solutions, optionally, the spring plate includes: a main board located inside the magnet cavity, with the spring plate disposed on the main board; a mounting plate connected to one or both ends of the main board, the mounting plate being in contact with the laminations at the top and / or bottom of the rotor core, the mounting plate having an mounting opening; the rotor core also includes: a connector adapted to the mounting opening, the connector being used to connect the mounting plate to the laminations.

[0043] In this technical solution, the structure of the spring plate is defined. The spring plate includes a main board and a mounting plate. The main board is located inside the magnet cavity, and the springs are mounted on the main board. The number of mounting plates is one or two. When there is only one mounting plate, it is connected to one end of the main board and is in contact with the laminations at the top or bottom of the rotor core. When there are two mounting plates, they are connected to both ends of the main board, and are in contact with the laminations at the top and bottom of the rotor core, respectively.

[0044] Furthermore, the mounting plate has a mounting opening, and the laminations also have mounting holes. The mounting opening and mounting holes are aligned. The rotor core also includes a connector that passes through the mounting opening and is inserted into the mounting hole to connect the mounting plate to the laminations, thereby fixing the spring plate in place. The connector can be a screw.

[0045] By setting a mounting plate on the spring plate, the spring plate can be installed and fixed by the cooperation of the connector with the mounting port on the mounting plate.

[0046] In some technical solutions, optionally, the length of the main board is H5, the thickness of the rotor core is H6, and the thickness of the spring is H3, where H3, H5, and H6 satisfy H6≤H5≤H6+2H3.

[0047] In this technical solution, the relationship between the dimensions of the main board, the rotor core, and the spring plates is defined. The length of the main board is H5, the thickness of the rotor core is H6, and the thickness of the spring plates is H3, where H3, H5, and H6 satisfy H6 ≤ H5 ≤ H6 + 2H3. When installing the spring plate, a certain dimensional margin needs to be reserved at both ends of the spring plate to avoid interference between the spring plate and the laminations. However, this dimensional margin cannot be too large, otherwise it will cause the spring plate to move up and down. Therefore, this application limits the length of the main board to the range of H6 to H6 + 2H3 to ensure the installation quality of the spring plate.

[0048] In some technical solutions, optionally, the motherboard is provided with multiple second clearance openings, which are correspondingly arranged with multiple spring pieces. The second clearance openings are arranged adjacent to the corresponding spring pieces. When the spring pieces are squeezed and deformed, the second clearance openings are used to avoid the spring pieces.

[0049] In this technical solution, the structure of the spring plate is further defined. To ensure that the spring has deformation space when it is compressed and deformed, a second clearance opening is also provided on the main board. Specifically, multiple second clearance openings are provided one-to-one with multiple springs, and the second clearance openings are arranged adjacent to the corresponding springs. When the magnet is inserted into the magnet cavity, the magnet compresses the spring to cause deformation. The spring bends along the direction toward the second clearance opening, which is used to avoid the spring, thereby providing sufficient deformation space for the spring.

[0050] Specifically, the width of the second clearance opening is greater than or equal to the width of the spring sheet, and the length of the second clearance opening is greater than or equal to the length of the spring sheet, so as to avoid interference with the spring sheet.

[0051] By opening a second clearance opening on the motherboard, the deformed spring can be cleared through the second clearance opening. On the one hand, it provides sufficient deformation space for the spring so that it can be squeezed and deformed normally. On the other hand, it can prevent interference between the deformed spring and the magnet, so that the magnet can be smoothly inserted into the magnet cavity.

[0052] In some technical solutions, optionally, there are multiple magnet cavities, including a first magnet cavity and a second magnet cavity. Along the direction perpendicular to the lamination, the projected area of ​​the second magnet cavity is smaller than the projected area of ​​the first magnet cavity. There are multiple spring plates, including a first spring plate and a second spring plate. The first spring plate has at least two spring plate groups, and the second spring plate has one spring plate group. The first spring plate is located in the first magnet cavity, and the second spring plate is located in the second magnet cavity.

[0053] In this technical solution, the magnet cavity and the corresponding spring plate are defined. There are multiple magnet cavities, including a first magnet cavity and a second magnet cavity, which have different dimensions and are used to accommodate magnets of different sizes. Specifically, along the direction perpendicular to the lamination, the projected area of ​​the second magnet cavity is smaller than that of the first magnet cavity, and the size of the magnet accommodated in the second magnet cavity is smaller than that accommodated in the first magnet cavity.

[0054] Furthermore, there are multiple spring plates, including a first spring plate and a second spring plate. The first spring plate has at least two spring groups, and the second spring plate has one spring group. The first spring plate is located in the first magnet cavity, and the second spring plate is located in the second magnet cavity. Understandably, the larger the size of the magnet, the greater the compressive force required by the spring plates to fix the magnet. By placing the first spring plate with a larger number of springs in the first magnet cavity, which is used to accommodate larger magnets, the magnet installed in the first magnet cavity can be subjected to a larger compressive force, while the magnet installed in the second magnet cavity can be subjected to a smaller compressive force. This ensures that the force on the magnet is matched to the volume of the magnet, thus keeping the magnet stable.

[0055] In some technical solutions, the spring sheet may optionally be magnetically conductive.

[0056] In this technical solution, the spring is further defined. The spring is made of a magnetically conductive material to give it magnetic properties. Specifically, the spring can be made of materials such as silicon steel or amorphous alloys to enable it to conduct magnetic fields. This further improves the magnetic permeability of the rotor core, thereby enhancing the motor's performance.

[0057] A second aspect of the present invention also provides a rotor comprising: the rotor core proposed in the first aspect of the present invention; and a plurality of magnets respectively installed in a plurality of magnet cavities of the rotor core.

[0058] This application proposes a rotor, which includes a rotor core and multiple laminations. The laminations are provided with magnet slots, and the magnet slots on the multiple stacked laminations together define a magnet cavity, in which a magnet is installed.

[0059] The rotor provided by the second aspect of the present invention, having the rotor core proposed in the first aspect of the present invention, has all the beneficial effects of the rotor core.

[0060] In some technical solutions, the rotor may optionally include: a rotating shaft, on which the rotor core is mounted, and the rotating shaft and the rotor core rotate synchronously.

[0061] In this technical solution, the structure of the rotor is further defined. The rotor also includes a shaft for mounting the rotor core. The rotor core has a shaft hole, and the shaft is pressed into the shaft hole to mount the rotor core onto the shaft. When the motor is running, the rotor and the shaft rotate synchronously.

[0062] Furthermore, the rotor also includes end plates, which are mounted on the shaft and fit against the end face of the rotor core. The rotor also includes pressure rings, which are mounted on the shaft and are used to press the end plates together to ensure a tight fit between the end plates and the rotor core.

[0063] A third aspect of the present invention also provides an electric motor comprising: the rotor core proposed in the first aspect of the present invention; or the rotor proposed in the second aspect of the present invention.

[0064] The motor provided by the third aspect of the present invention, having the rotor core proposed by the first aspect of the present invention or the rotor proposed by the second aspect of the present invention, has all the beneficial effects of the rotor core or the rotor.

[0065] In some technical solutions, the motor may optionally include: a stator having rotor slots, the rotor core of the rotor being located in the rotor slots, and the rotor rotating relative to the stator; and a housing in which the stator is mounted.

[0066] In this technical solution, the structure of the motor is further defined. The motor also includes a stator, which has rotor slots, and the rotor core is located within the rotor slots. During motor operation, the rotor rotates relative to the stator. The motor also includes a housing, which has mounting cavities, and the stator is located within the mounting cavities. The housing serves to protect the various components within the motor.

[0067] A fourth aspect of the present invention also provides a vehicle comprising: the rotor core proposed in the first aspect of the present invention; or the rotor proposed in the second aspect of the present invention; or the motor proposed in the third aspect of the present invention.

[0068] The vehicle provided by the fourth aspect of the present invention, having all the beneficial effects of the rotor core, rotor, or motor, is provided by the first aspect of the present invention, or the second aspect of the present invention, or the third aspect of the present invention.

[0069] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0070] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0071] Figure 1 A schematic diagram of the structure of a first lamination according to an embodiment of the present invention is shown;

[0072] Figure 2 A schematic diagram of the structure of the first magnet slot according to an embodiment of the present invention is shown;

[0073] Figure 3 A schematic diagram of the structure of the second lamination according to an embodiment of the present invention is shown;

[0074] Figure 4 A schematic diagram of the structure of the second magnet slot according to an embodiment of the present invention is shown;

[0075] Figure 5 One of the schematic diagrams of the rotor core according to an embodiment of the present invention is shown;

[0076] Figure 6 One of the schematic diagrams of a rotor core equipped with a magnet according to an embodiment of the present invention is shown;

[0077] Figure 7 A partial structural schematic diagram of a rotor core according to an embodiment of the present invention is shown;

[0078] Figure 8 It shows Figure 6 Sectional view of section AA;

[0079] Figure 9 It shows Figure 6 Sectional view of section BB;

[0080] Figure 10 A schematic diagram of the structure of the first spring plate according to an embodiment of the present invention is shown;

[0081] Figure 11 A schematic diagram of the structure of the second spring plate according to an embodiment of the present invention is shown;

[0082] Figure 12 A second schematic diagram of the rotor core structure according to an embodiment of the present invention is shown;

[0083] Figure 13 A second schematic diagram of the structure of a rotor core equipped with a magnet, according to an embodiment of the present invention, is shown.

[0084] Figure 14 A schematic diagram of the rotor structure according to an embodiment of the present invention is shown;

[0085] Figure 15 A schematic diagram of the structure of a motor according to an embodiment of the present invention is shown.

[0086] in, Figures 1 to 15 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0087] 100 Rotor core, 110 Lamination, 111 Magnet slot, 112 Magnet cavity, 113 Slot body, 114 First magnet cavity, 115 Second magnet cavity, 120 First lamination, 121 First magnet slot, 122 First sub-magnet slot, 123 Second sub-magnet slot, 130 Second lamination, 131 Second magnet slot, 132 First clearance opening, 140 Spring, 141 First end of spring, 142 Second end of spring, 150 Spring Plate, 151 Main board, 152 Mounting plate, 153 Mounting port, 154 Spring piece group, 155 Second clearance port, 156 First spring piece plate, 157 Second spring piece plate, 160 Connector, 200 Rotor, 210 Shaft, 220 Magnet, 230 Shaft hole, 240 End plate, 250 Pressure ring, 300 Motor, 310 Stator, 311 Rotor slot, 320 Housing, 321 Mounting cavity, 330 Front end cover, 340 Rear end cover. Detailed Implementation

[0088] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0089] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0090] The following reference Figures 1 to 15 The present invention describes a rotor core 100, a rotor 200, a motor 300, and a vehicle provided according to some embodiments thereof.

[0091] In one embodiment according to this application, such as Figure 1 , Figure 2 , Figure 5 and Figure 6As shown, this application proposes a rotor core 100 for mounting a magnet 220. The rotor core 100 includes: a plurality of laminations 110, which are stacked and have magnet slots 111. The plurality of magnet slots 111 on the stacked laminations define a magnet cavity 112 for mounting the magnet 220; and a plurality of spring pieces 140 located within the magnet cavity 112. When the magnet 220 is inserted into the magnet cavity 112, the spring pieces 140 deform under the compression of the magnet 220 and come into contact with the magnet 220, so that the spring pieces 140 exert a compressive force on the magnet 220. Along the length direction of the magnet slots 111, the spring pieces 140 have a first end and a second end. The first end 141 of the spring piece is located on the side of the second end 142 of the spring piece facing the center of the lamination 110, and the height of the second end 142 of the spring piece is less than the height of the first end 141 of the spring piece.

[0092] The rotor core 100 proposed in this application can be used in the rotor 200 of the motor 300. The rotor core 100 is used to mount magnets 220. The rotor core 100 includes multiple laminations 110, which are stacked to form the core. Each lamination 110 has a magnet slot 111. When multiple laminations 110 are stacked, the magnet slots 111 on the multiple laminations 110 are aligned and together define a magnet cavity 112, in which the magnet 220 can be mounted. The number of magnet slots 111 on the laminations 110 is multiple, thereby forming multiple magnet cavities 112 in the rotor core 100, which can accommodate multiple magnets 220.

[0093] Furthermore, to position the magnet 220, this application also provides a spring piece 140 in the rotor core 100. The spring piece 140 is located within the magnet cavity 112, which contains multiple spring pieces 140, each protruding from the cavity wall of the magnet cavity 112. Figure 7 As shown, during the process of inserting the magnet 220 into the magnet cavity 112, the magnet 220 compresses the spring piece 140. The spring piece 140 deforms under the compression of the magnet 220. The deformed spring piece 140 fits tightly with the magnet 220, and the spring piece 140 exerts a compressive force on the magnet 220. Figure 7 The direction indicated by the middle arrow is the direction in which the magnet 220 is inserted. In this way, the magnet 220 can be limited by the spring piece 140 to prevent the magnet 220 from coming out of the magnet cavity 112.

[0094] Furthermore, the shape of the spring 140 is defined such that the two ends of the spring 140 proposed in this application have different heights, so as to generate different compressive forces on the two ends of the magnet 220. Figure 2As shown, the height of the first end 141 of the spring piece is H1, and the height of the second end 142 of the spring piece is h1, where H1 > h1. Specifically, along the length direction of the magnet slot 111, the spring piece 140 has a first end and a second end. The first end 141 of the spring piece is located on the side of the second end 142 of the spring piece facing the center of the punch 110, that is, the first end 141 of the spring piece is located inside the second end 142 of the spring piece, and the height of the second end 142 of the spring piece is less than the height of the first end 141 of the spring piece. The shape of the spring piece 140 is characterized by irregular shapes such as arc or trapezoid.

[0095] Understandably, when the two ends of the spring 140 are at different heights, the compressive forces exerted by the first end 141 and the second end 142 of the spring on the magnet 220 are different, with the compressive force exerted by the second end 142 on the magnet 220 being less than the compressive force exerted by the first end 141 on the spring 140. When the rotor 200 rotates, the magnet 220 tends to move relative to the spring 140 under the action of centrifugal force, generating friction between the magnet 220 and the spring 140. Since the compressive force exerted by the second end 142 on the magnet 220 is less than the compressive force exerted by the first end 141 on the spring 140, the friction between the second end 142 and the magnet 220 is also less than the friction between the first end 141 and the magnet 220. As the rotational speed of rotor 200 increases, the centrifugal force of magnet 220 gradually increases. When the centrifugal force of magnet 220 is greater than the frictional force of spring 140 on magnet 220, the end of magnet 220 with less friction (i.e. the end closer to the second end 142 of spring) will swing first, and then magnet 220 will slide to the end of magnet slot 111 away from the center of rotor core 100.

[0096] By setting the spring piece 140 to have different heights at both ends, multiple magnets 220 can be moved to the end of the magnet slot 111 furthest from the center of the rotor core 100, making the positions of the multiple magnets 220 more consistent. This solves the problem of random and inconsistent positions of the magnets 220 in the magnet slot 111 caused by assembly reasons, and makes the weight of the rotor core 100 with magnets 220 installed more uniform and stable at various positions, thereby improving the rotational stability of the rotor core 100 and the performance of the motor 300. Furthermore, by using the spring piece 140 to position the magnets 220 in the rotor core 100, the production processes such as pasting magnets, potting magnets, and injection molding magnets can be reduced, simplifying the production process and effectively improving the level of automation.

[0097] Furthermore, the spring 140 can be an overall structure that is approximately trapezoidal, or it can be a regular structure such as a rectangle, triangle, or arc. The top of the spring 140 can be an arc, or it can be other irregular shapes.

[0098] In some embodiments, optionally, such as Figure 2 As shown, the magnet slot 111 includes: a slot body 113 for accommodating a magnet 220, wherein the slot walls at both ends of the slot body 113 can fit against the magnet 220; wherein, the width of the slot body 113 is W, the width of the spring piece 140 is W1, and W and W1 satisfy W1≤2 / 3×W; the height of the slot body 113 is H, and the height of the first end 141 of the spring piece is H1.

[0099] In this embodiment, the structure of the magnet slot 111 is defined. The magnet slot 111 includes a slot body 113, which is used to accommodate the magnet 220. When the magnet is installed in the magnet slot 111, the magnet 220 is in contact with the slot walls at both ends of the slot body 113. The width of the slot body 113 is W, and the width of the spring piece 140 is W1, where W and W1 satisfy W1 ≤ 2 / 3 × W. Optionally, W1 = 1 / (N1 + 1)W. In one possible embodiment, N1 is 1, and W1 = 1 / 2W.

[0100] Furthermore, the height of the groove body 113 is H, and the height of the first end 141 of the spring piece is H1, where H and H1 satisfy H1≤H. Optionally, H1=1 / (N2+1)H, where N2 is a positive integer. In one possible embodiment, N2 is 3, i.e., H1=1 / 4H.

[0101] By limiting the dimensional relationship between the spring 140 and the mounting slot as described above, it can be ensured that the dimensions of the spring 140 meet the strength requirements of the spring 140, so that the spring 140 can provide sufficient compressive force to the magnet 220 and keep the magnet 220 stable. On the other hand, it can avoid the problem of difficult installation of the magnet 220 caused by excessive strength of the spring 140.

[0102] In some embodiments, optionally, W1 also satisfies W1≤6mm, and H1 also satisfies H1≤1.85mm.

[0103] In this embodiment, the height and width of the spring piece 140 are defined. Specifically, the height of the first end 141 of the spring piece is H1, where H1 ≤ 1.85 mm, and the width of the spring piece 140 is W1, where W1 ≤ 6 mm. This ensures that the strength of the spring piece 140 meets the usage requirements, preventing it from breaking under pressure. It also prevents the spring piece 140 from being too stressed to bend and deform, allowing the magnet 220 to be inserted more easily into the first magnet slot 121.

[0104] In one possible embodiment, the height H1 of the first end 141 of the spring is 0.9 mm, and the width W1 of the spring 140 is 3.2 mm.

[0105] In some embodiments, optionally, such as Figure 1, Figure 2 , Figure 3 and Figure 4 As shown, the plurality of laminations 110 include: a first lamination 120, wherein a magnet groove 111 is provided on the first lamination 120 as a first magnet groove 121, and a spring piece 140 is provided on the groove wall of the first magnet groove 121; a second lamination 130, wherein a magnet groove 111 is provided on the second lamination 130 as a second magnet groove 131, and a first clearance opening 132 is provided on the second magnet groove 131 for clearance of the spring piece 140, and the plurality of second laminations 130 and the plurality of first laminations 120 are stacked at intervals.

[0106] In this embodiment, one structure of the rotor core 100 is defined, in which a spring 140 is disposed on a portion of the laminations 110. There are multiple laminations 110, including first laminations 120 and second laminations 130. The magnet slot 111 on the first lamination 120 is called the first magnet slot 121, and the spring 140 is disposed on the slot wall of the first magnet slot 121. The magnet slot 111 on the second lamination 130 is called the second magnet slot 131, and the second magnet slot 131 has a clearance opening for avoiding the spring 140. Multiple second laminations 130 and multiple first laminations 120 are stacked at intervals. When the magnet 220 is inserted into the first magnet slot 121 and the spring 140 is squeezed to deform the spring 140, the deformed spring 140 bends and inserts into the clearance opening on the second lamination 130 so that the magnet 220 can be smoothly inserted into the first magnet slot 121.

[0107] Specifically, multiple second magnet slots 131 are arranged in a one-to-one correspondence with multiple first magnet slots 121. The first magnet slots 121 on the first lamination 120 and the corresponding second magnet slots 131 on the second lamination 130 together define the magnet cavity 112. When the magnet 220 is installed on the rotor core 100, the magnet 220 is inserted into the first magnet slot 121 and the second magnet slot 131. One or more second laminations 130 are provided between any two adjacent first laminations 120. When the spring piece 140 is deformed by the magnet 220, the spring piece 140 bends and inserts into the first clearance opening 132 on the adjacent second lamination 130. This provides deformation space for the spring piece 140, allowing it to be deformed normally, and prevents interference between the deformed spring piece 140 and the magnet 220, allowing the magnet 220 to be smoothly inserted into the first magnet slot 121 and the second magnet slot 131.

[0108] In some embodiments, optionally, such as Figure 4 , Figure 6 , Figure 8 and Figure 9As shown, the width of the spring piece 140 is W1, the width of the first clearance opening 132 is W2, and W1 and W2 satisfy W2≥W1; the depth of the first clearance opening 132 is H2, and the thickness of the spring piece 140 is H3, and H2 and H3 satisfy H2≥H3.

[0109] In this embodiment, the dimensional relationship between the spring piece 140 and the first clearance opening 132 is defined. Specifically, the width of the spring piece 140 is W1, and the width of the first clearance opening 132 is W2, where W1 and W2 satisfy W2 ≥ W1. Understandably, when the spring piece 140 deforms, it inserts into the first clearance opening 132. If the width of the first clearance opening 132 is less than the width of the spring piece 140, the spring piece 140 will be unable to insert into the first clearance opening 132. Therefore, this application sets the width W2 of the first clearance opening 132 to be greater than or equal to the width W1 of the spring piece 140, so that the spring piece 140 can be inserted into the first clearance opening 132. In one possible embodiment, W2 = 1.1 × W1.

[0110] Furthermore, such as Figure 4 As shown, the depth of the first clearance opening 132 is H2, as... Figure 8 As shown, the thickness of the spring piece 140 is the same as the thickness of the first punch piece 120, and the thickness of the spring piece 140 is H3, where H2 and H3 satisfy H2≥H3. Understandably, when the spring piece 140 is inserted into the first clearance slot 132, if the thickness of the spring piece 140 is greater than the depth of the first clearance slot 132, part of the spring piece 140 will be located outside the first clearance slot 132, which may easily lead to interference between the spring piece 140 and the magnet 220. Therefore, this application sets the depth H2 of the first clearance slot 132 to be greater than or equal to the thickness H3 of the spring piece 140, so that the spring piece 140 can be inserted into the first clearance slot 132. In one possible embodiment, H2 = 1.05 × H3.

[0111] In some embodiments, optionally, such as Figure 2 and Figure 8 As shown, the height of the first end 141 of the spring is H1, the thickness of the second punch 130 is H4, and the number of second punches 130 between two adjacent first punches 120 is N3. H1, H4 and N3 satisfy N3×H4≥H1.

[0112] In this embodiment, the relationship between the height of the spring piece 140 and the thickness and number of the second tabs 130 is defined. Specifically, the height of the first end 141 of the spring piece is H1, the thickness of the second tabs 130 is H4, and the number of second tabs 130 between two adjacent first tabs 120 is N3, where H1, H4, and N3 satisfy N3×H4≥H1. Understandably, when there are multiple second tabs 130 between two adjacent first tabs 120, the first clearance openings 132 of the multiple second tabs 130 collectively define a space for accommodating the spring piece 140. After being compressed, the spring piece 140 bends and moves into the space defined by the multiple first clearance openings 132. By defining N3×H4≥H1, the common thickness of the multiple first clearance openings 132 can meet the height requirement of the spring piece 140, ensuring that the spring piece 140 is completely located within the space defined by the multiple first clearance openings 132, providing sufficient deformation space for the spring piece 140. The thickness of the second punch 130 can be the same as the thickness of the spring 140.

[0113] In some embodiments, optionally, such as Figure 1 and Figure 6 As shown, there are multiple first magnet slots 121, including first sub-magnet slots 122 and second sub-magnet slots 123. Along the direction perpendicular to the adjacent first laminations 120, the projected area of ​​the second sub-magnet slot 123 is smaller than the projected area of ​​the first sub-magnet slot 122, and the number of spring pieces 140 provided in the second sub-magnet slot 123 is smaller than the number of spring pieces 140 provided in the first sub-magnet slot 122.

[0114] In this embodiment, the first magnet slot 121 is further defined. There are multiple first magnet slots 121, including multiple first sub-magnet slots 122 and multiple second sub-magnet slots 123, which have different sizes and are used to accommodate magnets 220 of different sizes. Specifically, along the direction perpendicular to the adjacent first laminations 120, the projected area of ​​the second sub-magnet slot 123 is smaller than the projected area of ​​the first sub-magnet slot 122, and the size of the magnet 220 accommodated in the second sub-magnet slot 123 is smaller than the size of the magnet 220 accommodated in the first sub-magnet slot 122. Understandably, the larger the size of the magnet 220, the greater the compressive force required from the spring 140 to fix the magnet 220. Therefore, this application limits the number of spring pieces 140 on the first sub-magnet slot 122 and the second sub-magnet slot 123 as follows: the number of spring pieces 140 in the second sub-magnet slot 123 is less than the number of spring pieces 140 in the first sub-magnet slot 122. This allows the compressive force on the magnet 220 installed in the first sub-magnet slot 122 to be greater than the compressive force on the magnet 220 installed in the second sub-magnet slot 123, thus matching the force on the magnet 220 with its volume and maintaining the magnet 220's stability.

[0115] In some embodiments, optionally, at least two spring pieces 140 are provided on the wall of the first sub-magnet slot 122.

[0116] In this embodiment, the number of spring pieces 140 provided in the first sub-magnet slot 122 is limited. Specifically, at least two spring pieces 140 are provided on the slot wall of the first sub-magnet slot 122. Understandably, the first sub-magnet slot 122 is used to accommodate a larger magnet 220. In order to prevent the magnet 220 from detaching from the first sub-magnet slot 122, a greater compressive force needs to be applied to the magnet 220. By providing at least two spring pieces 140 on the slot wall of the first sub-magnet slot 122, the compressive force on the magnet 220 can be increased, thereby improving the stability of the magnet 220.

[0117] At least two spring pieces 140 can be sequentially disposed on one groove wall along the edge of the first sub-magnet groove 122, or they can be disposed on two opposite groove walls of the first sub-magnet groove 122.

[0118] In some embodiments, the spring 140 is optionally integrally formed with the first stamping 120.

[0119] In this embodiment, the structure of the spring 140 and the body of the first stamping 120 is defined. Specifically, the spring 140 and the body of the first stamping 120 are integrally formed. The first stamping 120 can be made of metal sheet, and the spring 140 is integrally formed with the body of the first stamping 120 by stamping. In this way, on the one hand, the connection strength between the spring 140 and the body of the first stamping 120 can be improved, reducing the possibility of the spring 140 falling off; on the other hand, the processing of the first stamping 120 is simplified, and the processing cost of the first stamping 120 is reduced.

[0120] In some embodiments, optionally, such as Figure 10 , Figure 11 , Figure 12 and Figure 13 As shown, the rotor core 100 also includes: a plurality of spring plates 150, which are correspondingly arranged with a plurality of magnet cavities 112. The two ends of the spring plates 150 are respectively connected to the laminations 110 at the top and bottom of the rotor core 100. At least a portion of the spring plates 150 is inserted into the corresponding magnet cavities 112. Spring pieces 140 are disposed on the spring plates 150. A plurality of spring pieces 140 are arranged sequentially along the length direction of the spring plates 150 to form a spring piece group 154. The spring plates 150 have at least one spring piece group 154.

[0121] In this embodiment, a different structure of rotor core 100 is defined, in which spring plates 140 are disposed on spring plate 150. The rotor core 100 includes multiple spring plates 150, the number of which is the same as the number of magnet cavities 112, and they are arranged in a one-to-one correspondence. At least a portion of the spring plate 150 is inserted into the corresponding magnet cavity 112. The spring plate 140 is disposed on the portion of the spring plate 150 inserted into the magnet cavity 112 to compress and position the magnet 220. Specifically, both ends of the spring plate 150 are connected to the laminations 110 at the top and bottom of the rotor core 100, respectively, to fix the spring plate 150. Spring pieces 140 are arranged in an array on spring plate 150. Multiple spring pieces 140 are sequentially arranged along the length of spring plate 150 to form spring piece groups 154. Spring plate 150 has at least one spring piece group 154. When there are multiple spring piece groups 154, the multiple spring piece groups 154 are sequentially arranged along the width of spring plate 150. The overall shape of spring plate 150 is approximately I-shaped or L-shaped.

[0122] By setting a spring plate 150 in the rotor core 100 and setting the springs 140 on the spring plate 150, multiple springs 140 can be processed in a concentrated manner when processing the spring plate 150, eliminating the need to process each spring 140 individually when processing the laminations 110, thus improving production efficiency.

[0123] In some embodiments, optionally, such as Figure 10 , Figure 11 and Figure 12 As shown, the spring plate 150 includes: a main plate 151 located inside the magnet cavity 112, with spring plates 140 disposed on the main plate 151; a mounting plate 152 connected to one or both ends of the main plate 151, the mounting plate 152 being in contact with the laminations 110 at the top and / or bottom of the rotor core 100, and the mounting plate 152 having a mounting opening 153; the rotor core 100 also includes: a connector 160 adapted to the mounting opening 153, the connector 160 being used to connect the mounting plate 152 to the laminations 110.

[0124] In this embodiment, the structure of the spring plate 150 is defined. The spring plate 150 includes a main plate 151 and a mounting plate 152. The main plate 151 is located within the magnet cavity 112, and the spring 140 is disposed on the main plate 151. The number of mounting plates 152 is one or two. When there is only one mounting plate 152, the mounting plate 152 is connected to one end of the main plate 151, and the mounting plate 152 is in contact with the laminations 110 at the top or bottom of the rotor core 100. When there are two mounting plates 152, the two mounting plates 152 are respectively connected to both ends of the main plate 151, and the two mounting plates 152 are respectively in contact with the laminations 110 at the top and bottom of the rotor core 100.

[0125] Furthermore, the mounting plate 152 is provided with a mounting opening 153, and the lamination 110 is also provided with a mounting hole. The mounting opening 153 is aligned with the mounting hole. The rotor core 100 also includes a connector 160, which passes through the mounting opening 153 and is inserted into the mounting hole to connect the mounting plate 152 to the lamination 110, thereby fixing the spring plate 150 in place. The connector 160 can be a screw.

[0126] By providing a mounting plate 152 on the spring plate 150, the spring plate 150 can be installed and fixed by the cooperation of the connector 160 with the mounting port 153 on the mounting plate 152.

[0127] In some embodiments, optionally, such as Figure 8 , Figure 10 , Figure 11 and Figure 12 As shown, the length of the main board 151 is H5, the thickness of the rotor core 100 is H6, and the thickness of the spring 140 is H3. H3, H5, and H6 satisfy H6≤H5≤H6+2H3.

[0128] In this embodiment, the relationship between the dimensions of the main board 151, the rotor core 100, and the spring plate 140 is defined. The length of the main board 151 is H5, the thickness of the rotor core 100 is H6, and the thickness of the spring plate 140 is H3, where H3, H5, and H6 satisfy H6 ≤ H5 ≤ H6 + 2H3. When installing the spring plate 150, a certain dimensional margin needs to be reserved at both ends of the spring plate 150 to avoid interference between the spring plate 150 and the lamination 110. However, this dimensional margin cannot be too large, otherwise it will cause the spring plate 150 to move up and down. Therefore, this application limits the length of the main board 151 to the range of H6 to H6 + 2H3 to ensure the installation quality of the spring plate 150.

[0129] In some embodiments, optionally, such as Figure 10 and Figure 11 As shown, the motherboard 151 has a plurality of second clearance openings 155, and the plurality of second clearance openings 155 are correspondingly arranged with the plurality of spring pieces 140. The second clearance openings 155 are arranged adjacent to the corresponding spring pieces 140. When the spring piece 140 is squeezed and deformed, the second clearance openings 155 are used to avoid the spring piece 140.

[0130] In this embodiment, the structure of the spring plate 150 is further defined. To provide deformation space for the spring 140 when it is compressed and deformed, a second clearance opening 155 is also provided on the main board 151. Specifically, multiple second clearance openings 155 are provided one-to-one with multiple springs 140, and the second clearance openings 155 are arranged adjacent to the corresponding springs 140. When the magnet 220 is inserted into the magnet cavity 112, the magnet 220 compresses the spring 140 to deform it. The spring 140 bends in the direction toward the second clearance opening 155, which is used to avoid the spring 140, thereby providing sufficient deformation space for the spring 140.

[0131] Specifically, the width of the second clearance opening 155 is greater than or equal to the width of the spring 140, and the length of the second clearance opening 155 is greater than or equal to the length of the spring 140, so as to avoid interference with the spring 140.

[0132] By opening a second clearance opening 155 on the motherboard 151, the deformed spring piece 140 can be avoided through the second clearance opening 155. On the one hand, it provides sufficient deformation space for the spring piece 140 so that the spring piece 140 can be squeezed and deformed normally. On the other hand, it can prevent interference between the deformed spring piece 140 and the magnet 220, so that the magnet 220 can be smoothly inserted into the magnet cavity 112.

[0133] In some embodiments, optionally, such as Figure 12 and Figure 13As shown, there are multiple magnet cavities 112, including a first magnet cavity 114 and a second magnet cavity 115. Along the direction perpendicular to the lamination 110, the projected area of ​​the second magnet cavity 115 is smaller than the projected area of ​​the first magnet cavity 114. Multiple spring plates 150 include a first spring plate 156 and a second spring plate 157. The first spring plate 156 has at least two spring plate groups 154, and the second spring plate 157 has one spring plate group 154. The first spring plate 156 is disposed in the first magnet cavity 114, and the second spring plate 157 is disposed in the second magnet cavity 115.

[0134] In this embodiment, the magnet cavity 112 and the corresponding spring plate 150 are defined. There are multiple magnet cavities 112, including a first magnet cavity 114 and a second magnet cavity 115, which have different sizes and are used to accommodate magnets 220 of different sizes. Specifically, along the direction perpendicular to the lamination 110, the projected area of ​​the second magnet cavity 115 is smaller than the projected area of ​​the first magnet cavity 114, and the size of the magnet 220 accommodated in the second magnet cavity 115 is smaller than the size of the magnet 220 accommodated in the first magnet cavity 114.

[0135] Furthermore, there are multiple spring plates 150, including a first spring plate 156 and a second spring plate 157. The first spring plate 156 has at least two spring groups 154, and the second spring plate 157 has one spring group 154. The first spring plate 156 is located in the first magnet cavity 114, and the second spring plate 157 is located in the second magnet cavity 115. Understandably, the larger the size of the magnet 220, the greater the compressive force required from the spring plates 140 to fix the magnet 220. By placing a first spring plate 156 with a large number of spring pieces 140 inside a first magnet cavity 114 for accommodating a larger magnet 220, the magnet 220 installed in the first magnet cavity 114 can be subjected to a larger compressive force, while the magnet 220 installed in the second magnet cavity 115 can be subjected to a smaller compressive force, so that the force on the magnet 220 is matched with the volume of the magnet 220, and the magnet 220 remains stable.

[0136] In some embodiments, the spring 140 may optionally be magnetically conductive.

[0137] In this embodiment, the spring 140 is further defined. The spring 140 is made of a magnetically conductive material to give it magnetic properties. Specifically, the spring 140 can be made of materials such as silicon steel or amorphous alloy to enable it to conduct magnetic fields. This further improves the magnetic permeability of the rotor core 100, thereby enhancing the performance of the motor 300.

[0138] A second aspect of the present invention also provides a rotor 200, comprising: a rotor core 100 as described in the first aspect of the present invention; and a plurality of magnets 220 respectively installed in a plurality of magnet cavities 112 of the rotor core 100.

[0139] like Figure 14 As shown, this application proposes a rotor 200, which includes a rotor core 100 and a plurality of laminations 110. The laminations 110 are provided with magnet slots 111. The magnet slots 111 on the plurality of stacked laminations 110 together define a magnet cavity 112. A magnet 220 is installed in the magnet cavity 112.

[0140] The rotor 200 provided in the second aspect of the present invention, having the rotor core 100 proposed in the first aspect of the present invention, has all the beneficial effects of the rotor core 100.

[0141] In some embodiments, the rotor 200 may optionally include a shaft 210, on which the rotor core 100 is mounted, and the shaft 210 and the rotor core 100 rotate synchronously.

[0142] In this embodiment, the structure of the rotor 200 is further defined. The rotor 200 also includes a shaft 210 for mounting the rotor core 100. The rotor core 100 has a shaft hole 230, and the shaft 210 is pressed into the shaft hole 230 to mount the rotor core 100 onto the shaft 210. When the motor 300 is running, the rotor 200 and the shaft 210 rotate synchronously.

[0143] Furthermore, the rotor 200 also includes an end plate 240, which is mounted on the shaft 210 and fits against the end face of the rotor core 100. The rotor 200 also includes a pressure ring 250, which is mounted on the shaft 210 and is used to press the end plate 240 tightly so that the end plate 240 fits tightly against the rotor core 100.

[0144] A third aspect of the present invention also provides an electric motor 300, comprising: the rotor core 100 proposed in the first aspect of the present invention; or the rotor 200 proposed in the second aspect of the present invention.

[0145] The motor 300 provided in the third aspect of the present invention, having the rotor core 100 proposed in the first aspect of the present invention or the rotor 200 proposed in the second aspect of the present invention, has all the beneficial effects of the rotor core 100 or the rotor 200.

[0146] In some embodiments, optionally, such as Figure 15As shown, the motor 300 also includes: a stator 310 having a rotor slot 311, the rotor core 100 of the rotor 200 being located in the rotor slot 311, and the rotor 200 rotating relative to the stator 310; and a housing 320 in which the stator 310 is installed.

[0147] In this embodiment, the structure of the motor 300 is further defined. The motor 300 also includes a stator 310, which has rotor slots 311. The rotor core 100 of the rotor 200 is located within the rotor slots 311. When the motor 300 is running, the rotor 200 rotates relative to the stator 310. The motor 300 also includes a housing 320, which has a mounting cavity 321. The stator 310 is located within the mounting cavity 321. The housing 320 is used to protect the various components in the motor 300.

[0148] A fourth aspect of the present invention also provides a vehicle comprising: a rotor core 100 as provided in the first aspect of the present invention; or a rotor 200 as provided in the second aspect of the present invention; or a motor 300 as provided in the third aspect of the present invention.

[0149] The vehicle provided by the fourth aspect of the present invention, having all the beneficial effects of the rotor core 100, rotor 200, or motor 300 proposed in the first aspect of the present invention, or rotor 200 or motor 300 proposed in the second aspect of the present invention, has all the beneficial effects of the rotor core 100, rotor 200, or motor 300.

[0150] In one possible embodiment, such as Figure 1 The diagram shown is a structural schematic of an embodiment of the present invention. This embodiment relates to a spring-loaded lamination 110 (i.e., the first lamination 120), a rotor 200, and a motor 300. The spring-loaded lamination 110 is provided with spring pieces 140, which are located in the magnet slot (i.e., the first magnet slot 121). The large magnet slot (i.e., the first sub-magnet slot 122) has two spring pieces 140, which can increase the spring force and more effectively fix the large magnet (i.e., the first magnet slot 121). The larger magnet 220) has a spring sheet 140 with a spring-loaded structure in the small magnet slot (i.e., the second sub-magnet slot 123). The proximal end (i.e., the first end 141 of the spring sheet) of the spring sheet 140 with the spring-loaded structure is higher than the distal end (i.e., the second end 142 of the spring sheet). The total height H1 of the spring sheet 140 with the spring-loaded structure is 0.9 mm and the width W1 is 3.2 mm. The top end is connected to the proximal end and the distal end of the spring sheet 140 with an outward convex arc, so that the spring sheet 140 can provide different spring pressures.

[0151] like Figure 3As shown, a spring-loaded relief structure is provided in the punch 110 (i.e., the second punch 130). In the large magnet groove and the small magnet groove, corresponding to the position of the spring piece 140 of the above-mentioned spring-loaded relief structure punch 110, a spring-loaded relief structure (i.e., the first relief opening 132) is provided respectively. The width W2 of the spring-loaded relief structure is ≥3.2mm, and the depth H2 of the spring-loaded relief structure is ≥the thickness of the spring-loaded relief structure punch 110 (i.e. the thickness of the spring piece 140) H3. When the spring piece 140 is deformed, it plays the role of avoiding and placing the spring piece 140.

[0152] like Figure 5 and Figure 8 As shown, the above-mentioned laminations 110 with spring-loaded structure and laminations 110 with spring-loaded clearance structure are alternately stacked to form a core with spring-loaded structure (i.e., rotor core 100). When 9 laminations 110 with spring-loaded clearance structure (i.e., second laminations 130) are stacked, 1 lamination 110 with spring-loaded structure (i.e., first lamination 120) is stacked to avoid interference when the spring piece 140 on the lamination 110 with spring-loaded structure deforms due to interaction with the magnet.

[0153] like Figure 5 and Figure 6 As shown, a large magnet (i.e., the larger magnet 220) is inserted into the large magnet slot (i.e., the first sub-magnet slot 122) of the spring-loaded iron core. During insertion, the large magnet interacts with the spring piece 140 on the lamination 110, which has a spring-loaded structure. The spring piece 140 deforms, generating a spring force that presses and fixes the large magnet. Similarly, a small magnet (i.e., the smaller magnet 220) is inserted into the small magnet slot (i.e., the second sub-magnet slot 123) of the spring-loaded iron core. During insertion, the small magnet interacts with the spring piece 140 on the lamination 110, which has a spring-loaded structure. The spring piece 140 deforms, generating a spring force that presses and fixes the small magnet. Because the top of the spring piece 140 has an irregular structure such as an arc, the spring pressure at different positions of the spring piece 140 is not the same, thus providing different spring pressures. The spring pressure at the proximal end (i.e., the first end 141 of the spring piece) is greater. When the motor 300 accelerates and decelerates rapidly, the large magnet side at the distal end (i.e., the second end 142 of the spring piece) is prone to slight oscillation, causing the large magnet to slide towards the distal end side of the large magnet slot. This makes the distribution of large magnets more uniform, and the force on each large magnet more consistent. This solves the problem of inconsistent relative positions of each large magnet caused by the random assembly of large magnets into the iron core. The iron core assembly (i.e., the rotor iron core 100 and the magnet 220) reaches a more stable state. The same applies to the small magnets.

[0154] like Figure 14 As shown, the rotor 200 shaft (i.e., the rotating shaft 210) is pressed into the shaft hole 230 of the spring-loaded iron core assembly, and then the end plate 240 is installed on the rotor 200 shaft. The pressure ring 250 is pressed into the rotor 200 shaft so that the end plate 240 is tightly attached to the end face of the spring-loaded iron core assembly.

[0155] like Figure 15 As shown, the stator 310 is heat-fitted into the housing (i.e., housing 320), and then the front end cover 330 is installed on the housing. Then, the spring-loaded rotor 200 (i.e. rotor 200) is pressed into the front end cover 330 using a hydraulic press. Finally, the rear end cover 340 is installed on the housing to assemble a motor 300 with a spring-loaded structure. The motor 300 uses a spring sheet 140 to fix the magnets, which can effectively simplify the magnet fixing method, reduce production steps, simplify the production process, and improve the level of automation. When the magnets are evenly distributed in the magnet slots at the far end in the later stage, the magnets are more evenly and stably distributed.

[0156] In another possible embodiment, one embodiment of the present invention relates to a spring-loaded structural lamination 110 (i.e. lamination 110), a rotor 200 and a motor 300, wherein the spring-loaded structural lamination 110 is stacked to form a rotor core 100, and the spring-loaded structural lamination 110 may be the spring-loaded relief structural lamination 110 (i.e., the second lamination 130) in the previous embodiment.

[0157] The larger spring clip 140 (i.e., the first spring clip plate 156) is installed into the larger magnet slot (i.e., the first magnet cavity 114) of the rotor core 100, and the fastening hole (i.e., the mounting port 153) on the spring clip 140 is aligned with the rivet hole. The rivet (i.e., the connector 160) of the core assembly is driven into the rivet hole, thereby fixing the larger spring clip 140.

[0158] The smaller spring clip 140 (i.e., the second spring clip plate 157) is installed into the smaller magnet slot (i.e., the second magnet cavity 115) of the rotor core 100, and the fastening hole on the spring clip 140 is aligned with the rivet hole. The rivet of the core assembly is driven into the rivet hole, thereby fixing the smaller spring clip 140.

[0159] like Figure 12 and Figure 13As shown, a large magnet is inserted into the large magnet slot (i.e., the first magnet cavity 114) of the spring-loaded iron core. During insertion, the large magnet interacts with the spring piece 140 on the larger spring-loaded spring plate 140 (i.e., the first spring plate 156), causing the spring piece 140 to deform and generate spring force, which presses and fixes the large magnet. Similarly, a small magnet is inserted into the small magnet slot (i.e., the second magnet cavity 115) of the spring-loaded iron core. During insertion, the small magnet interacts with the smaller spring piece 140 (i.e., the second spring plate 157), causing the spring piece 140 to deform and generate spring force, which presses and fixes the small magnet. Because the top of the spring piece 140 has an irregular structure such as an arc, the spring pressure at different positions of the spring piece 140 is not the same, thus providing different spring pressures. The spring pressure at the proximal end (i.e., the first end 141 of the spring piece) is greater. When the motor 300 accelerates and decelerates rapidly, the large magnet side at the distal end (i.e., the second end 142 of the spring piece) is prone to slight oscillation, causing the large magnet to slide towards the distal end side of the large magnet slot. This makes the distribution of large magnets more uniform, and the force on each large magnet more consistent. This solves the problem of inconsistent relative positions of each large magnet caused by the random assembly of large magnets into the iron core, and the iron core assembly reaches a more stable state. The same applies to the small magnets.

[0160] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0161] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0162] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rotor core, characterized in that, The rotor core is used to mount magnets, and the rotor core includes: Multiple laminations are stacked together, each lamination having a magnet slot. The multiple overlapping laminations have corresponding magnet slots defining a magnet cavity, which is used to mount the magnet. Multiple spring pieces are located inside the magnet cavity. When the magnet is inserted into the magnet cavity, the spring pieces deform under the compression of the magnet and come into contact with the magnet, so that the spring pieces exert a compressive force on the magnet. Along the length of the magnet slot, the spring has a first end and a second end. The first end of the spring is located on the side of the second end of the spring facing the center of the punch, and the height of the second end of the spring is less than the height of the first end of the spring.

2. The rotor core according to claim 1, characterized in that, The magnet slot includes: The groove body is used to accommodate the magnet, and the groove walls at both ends of the groove body can fit against the magnet; Wherein, the width of the groove body is W, the width of the spring piece is W1, and W and W1 satisfy W1≤2 / 3×W; The height of the groove body is H, and the height of the first end of the spring piece is H1, where H and H1 satisfy H1≤H.

3. The rotor core according to claim 2, characterized in that, W1 also satisfies W1≤6mm, and H1 also satisfies H1≤1.85mm.

4. The rotor core according to any one of claims 1 to 3, characterized in that, The plurality of said laminations include: The first lamination has a magnet slot on it, and the spring piece is disposed on the wall of the first magnet slot. The second stamp has a magnet slot on it, and a first clearance opening is provided on the second magnet slot. The first clearance opening is used to avoid the spring piece. Multiple second stamps and multiple first stamps are stacked at intervals.

5. The rotor core according to claim 4, characterized in that, The width of the spring piece is W1, and the width of the first clearance opening is W2, where W1 and W2 satisfy W2≥W1; The depth of the first clearance opening is H2, and the thickness of the spring piece is H3, where H2 and H3 satisfy H2≥H3.

6. The rotor core according to claim 4, characterized in that, The height of the first end of the spring piece is H1, the thickness of the second punch piece is H4, and the number of second punch pieces between two adjacent first punch pieces is N3. H1, H4 and N3 satisfy N3×H4≥H1.

7. The rotor core according to claim 4, characterized in that, The number of first magnet slots is multiple, and the multiple first magnet slots include first sub-magnet slots and second sub-magnet slots. Along the direction perpendicular to the adjacent first lamination, the projected area of ​​the second sub-magnet slot is smaller than the projected area of ​​the first sub-magnet slot, and the number of spring pieces disposed in the second sub-magnet slot is smaller than the number of spring pieces disposed in the first sub-magnet slot.

8. The rotor core according to claim 4, characterized in that, The spring sheet is integrally formed with the first punch sheet.

9. The rotor core according to any one of claims 1 to 3, characterized in that, Also includes: Multiple spring plates are arranged corresponding to multiple magnet cavities. The two ends of the spring plates are respectively connected to the laminations at the top and bottom of the rotor core. At least a portion of the spring plates is inserted into the corresponding magnet cavity. The springs are disposed on the spring plates. Multiple springs are arranged sequentially along the length direction of the spring plates to form a spring plate group. The spring plate has at least one spring plate group.

10. The rotor core according to claim 9, characterized in that, The spring plate includes: The motherboard is located inside the magnet cavity, and the spring contact is disposed on the motherboard; A mounting plate is connected to one or both ends of the main board. The mounting plate is in contact with the laminations at the top and / or bottom of the rotor core. The mounting plate is provided with mounting openings. The rotor core also includes: A connector, adapted to the mounting port, is used to connect the mounting plate to the lamination.

11. The rotor core according to claim 10, characterized in that, The length of the main board is H5, the thickness of the rotor core is H6, and the thickness of the spring is H3. H3, H5, and H6 satisfy H6≤H5≤H6+2H3.

12. The rotor core according to claim 10, characterized in that, The motherboard has multiple second clearance openings, which are corresponding to multiple spring pieces. The second clearance openings are arranged adjacent to the corresponding spring pieces. When a spring piece is squeezed and deformed, the second clearance opening is used to avoid the spring piece.

13. The rotor core according to claim 9, characterized in that, The number of magnet cavities is multiple, including a first magnet cavity and a second magnet cavity. Along the direction perpendicular to the lamination, the projected area of ​​the second magnet cavity is smaller than the projected area of ​​the first magnet cavity. The plurality of spring plates include a first spring plate and a second spring plate. The first spring plate has at least two spring groups, and the second spring plate has one spring group. The first spring plate is disposed in the first magnet cavity, and the second spring plate is disposed in the second magnet cavity.

14. The rotor core according to any one of claims 1 to 3, characterized in that, The spring sheet is magnetically conductive.

15. A rotor, characterized in that, include: Rotor core as described in any one of claims 1 to 14; Multiple magnets are respectively installed in multiple magnet cavities of the rotor core.

16. An electric motor, characterized in that, include: Rotor core as described in any one of claims 1 to 14; or The rotor as described in claim 15.

17. A vehicle, characterized in that, include: Rotor core as described in any one of claims 1 to 14; or The rotor as described in claim 15; or The motor as described in claim 16.

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