Rotor laminations, rotors, motors, pumps, and vehicles

Abstract

This application provides a rotor lamination, a rotor, a motor, a pump, and a vehicle. The rotor lamination is used for a rotor, which includes multiple permanent magnets. Each rotor lamination includes a lamination body and at least one positioning slot. The lamination body has a shaft hole, and the at least one positioning slot is disposed on the lamination body and communicates with the shaft hole. The at least one positioning slot is used to directly or indirectly position the permanent magnets. This application, without adding any components, can accurately locate the magnetization position of the permanent magnets based on their positions, thereby improving the overall magnetization accuracy, ensuring saturation of the permanent magnets, effectively solving the magnetization positioning problem, and minimizing motor weight and production costs while maintaining motor performance.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and more specifically, to a rotor lamination, a rotor, an electric motor, a pump, and a vehicle. Background Technology

[0002] Currently, with the rapid development of society, electric motors can generate driving torque and serve as a power source for electrical appliances or various machines, thus attracting more and more attention and developing towards higher power density and higher speed.

[0003] However, in existing motor rotors, multiple rotor laminations are stacked axially to form the rotor core. After the permanent magnets are installed into the rotor core, they are coated with plastic. The plastic-coated permanent magnets are blocked, which leads to problems such as difficulty in overall magnetization and positioning, and low magnetization saturation of the permanent magnets. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art or related technologies.

[0005] Therefore, the first aspect of the present invention is to provide a rotor lamination.

[0006] A second aspect of the invention is that a rotor is provided.

[0007] A third aspect of the invention is that an electric motor is provided.

[0008] A fourth aspect of the invention is to provide a pump.

[0009] The fifth aspect of the invention is to provide a vehicle.

[0010] In view of the above, according to the first aspect of this application, a rotor lamination is provided for a rotor, the rotor including a plurality of permanent magnets, the rotor lamination including a lamination body and at least one positioning groove, the lamination body having a shaft hole, the at least one positioning groove being disposed on the lamination body, the at least one positioning groove communicating with the shaft hole, the at least one positioning groove being used to directly or indirectly position the permanent magnets.

[0011] The rotor laminations provided in this application are used in a rotor, which includes multiple permanent magnets. Multiple rotor laminations are stacked axially to form a rotor core, and the multiple permanent magnets are disposed on the rotor core. Each rotor lamination includes a lamination body and at least one positioning groove. The lamination body has a shaft hole for accommodating a rotating shaft. Further, the shaft hole is located in the middle of the lamination body. The positioning groove is disposed on the lamination body and communicates with the shaft hole. The positioning groove is used to directly or indirectly position the permanent magnets. Without adding any components, the magnetization position of the permanent magnets can be accurately located based on their position, thereby improving the overall magnetization accuracy, ensuring saturation of the permanent magnets, effectively solving the magnetization positioning problem, and minimizing motor weight and production costs while ensuring motor performance.

[0012] The rotor has multiple permanent magnets, whose relative positions on the rotor laminations are fixed. There are one or more positioning slots. Each positioning slot has a fixed position on the lamination body, and the relative positions of the permanent magnets on the lamination body are also fixed. Therefore, whether there is one or multiple positioning slots, accurate positioning of the permanent magnets can be achieved. When there is only one positioning slot, it can pinpoint the exact position of one permanent magnet. Then, based on the arrangement of the permanent magnets on the rotor, the positions of the other permanent magnets can be inferred. When there are multiple positioning slots, they are also spaced axially along the shaft holes, ensuring a one-to-one correspondence between the slots and the permanent magnets. This allows the accurate position of each permanent magnet to be directly obtained through the positioning slots.

[0013] It should be noted that during the magnetization process, the magnetization fixture can be directly engaged with the positioning groove, thereby achieving direct positioning of the permanent magnet by the positioning groove.

[0014] Alternatively, the rotor includes a housing connected to the rotor core. The housing has a positioning structure that mates with a positioning slot. During the mating process between the housing and the rotor core, the positioning structure engages with the positioning slot, thus achieving the positioning and installation of the housing. During magnetization, the relative positions of the permanent magnet and the positioning slot, the positioning slot and the positioning structure, and the positioning structure on the housing are fixed. This ensures that the relative positions of the permanent magnet and the magnetizing coil on the magnetizing fixture are consistently fixed, guaranteeing accurate magnetization direction and ensuring that the magnetic field after magnetization matches the design specifications, thereby improving the magnetization saturation of the permanent magnet.

[0015] It is worth noting that the outer shell can be formed directly on the rotor core using injection molding. The bonding strength between the plastic-coated shell and the rotor core can effectively prevent external gases or liquids from contacting the rotor core or entering the interior of the rotor core through the plastic-coated shell, thereby preventing corrosion of the rotor core and playing a role in rust prevention.

[0016] In one possible design, the lamination body further includes a mounting wall for housing a permanent magnet. The mounting wall includes a mounting section on the axial end face, and a positioning groove includes a notch facing the center of the shaft hole. The lamination body includes multiple magnetic pole centerlines. The minimum distance L between the mounting section and the center of the shaft hole, the width w of the notch, the depth b of the positioning groove, the included angle β between adjacent magnetic pole centerlines, and the radius R of the shaft hole are specified. ir The pole pair number p of the lamination body satisfies, .

[0017] In this design, the lamination body also includes a mounting wall for mounting permanent magnets. When the permanent magnets are embedded in the lamination body, the lamination body has magnet slots, and the mounting wall is the wall of the magnet slots. When the permanent magnets are surface-mounted on the lamination body, a portion of the outer or inner peripheral wall of the lamination body is used to mount the permanent magnets.

[0018] Specifically, when the rotor is located inside the stator, a portion of the outer peripheral wall of the lamination body is a mounting wall; or, when the rotor is located outside the stator, a portion of the inner peripheral wall of the lamination body is a mounting wall.

[0019] The mounting wall is a wall surface extending along the axial direction. It can be a straight wall or an arc-shaped wall. The shape of the cross-section of the mounting wall perpendicular to the axial direction is the mounting segment. When the shape of the mounting wall is different, the shape of the mounting segment is also different.

[0020] For example, when the mounting wall is a straight wall, the mounting segment is a straight segment, which is suitable for embedded permanent magnets. When the permanent magnet is a straight magnet, there are two straight segments: a first straight segment and a second straight segment. The first straight segment is positioned closer to the shaft hole than the second straight segment. In this case, the minimum distance L between the center of the mounting segment and the center of the shaft hole is the same as the distance between the center of the first straight segment and the center of the shaft hole.

[0021] Alternatively, when the mounting wall is curved, the mounting section is an arc segment, suitable for surface-mount permanent magnets. The distance between the arc segment and the center of the shaft hole is the radial length from the center of the shaft hole to the arc segment.

[0022] Furthermore, the positioning groove includes a notch facing the center of the shaft hole, that is, the notch of the positioning groove faces the central axis of the shaft hole. The notch of the positioning groove includes a first notch end point and a second notch end point, and the straight-line distance between the first notch end point and the second notch end point is the width of the positioning groove notch. The depth of the positioning groove is the depth from the notch of the positioning groove to the bottom of the positioning groove. When the bottom of the positioning groove is flat, the depth of the positioning groove is unique. When the bottom of the positioning groove is not flat, such as a curved bottom, the depth of the positioning groove has multiple depth values. In this case, the depth b of the positioning groove is the maximum depth.

[0023] Alternatively, since the surfaces where the first and second slot endpoints are located are part of the cylindrical surface where the shaft hole is located, the chord length of the arc between the first and second slot endpoints on the cross-section perpendicular to the axial direction is the width of the locating slot opening.

[0024] In this design, on the axial end face of the lamination body, the line connecting the midpoint of the mounting segment corresponding to the mounting wall used to mount the permanent magnet and the center of the shaft hole is called the magnetic pole center line (d-axis). The line between two adjacent magnetic pole center lines is called the inter-pole center line (q-axis). When the mounting segment is a straight line, the line connecting the midpoint of the straight line segment and the center of the shaft hole is d-axis. When the mounting segment is an arc segment, the line connecting the midpoint of the arc segment and the center of the shaft hole is q-axis.

[0025] Furthermore, the minimum distance L between the center of the mounting section and the shaft hole, the width w of the slot, the depth b of the positioning slot, the included angle β between the center lines of adjacent magnetic poles, and the radius R of the shaft hole are all considered. ir When the number of pole pairs p of the lamination body satisfies the above formula, without increasing the number of parts, optimizing the size of the positioning groove, the distance between the permanent magnet and the shaft hole, and the size of the shaft hole can effectively improve the magnetization saturation of the permanent magnet, reduce the weight of the motor to the greatest extent while ensuring the motor performance, and reduce production costs.

[0026] The included angle β between the center lines of adjacent magnetic poles can be 30°, 45°, 90°, etc. The number of pole pairs in the lamination body is related to the number of magnetic poles in the lamination body. The number of pole pairs p can be 2 or 4, corresponding to 4 or 8 magnetic poles. The number of permanent magnets under each magnetic pole of the lamination body is an integer greater than 1. For example, when the number of permanent magnets under each magnetic pole is 1, the permanent magnets can be in a straight line shape. When the number of permanent magnets under each magnetic pole is 2, the permanent magnets can be in a V shape. When the number of permanent magnets under each magnetic pole is 3, the permanent magnets can be in a "+V" shape.

[0027] In one possible design, further details include the minimum distance L between the center of the mounting section and the shaft hole, the width w of the slot, the depth b of the positioning slot, the included angle β between the center lines of adjacent magnetic poles, and the radius R of the shaft hole. ir The pole pair number p of the lamination body satisfies, .

[0028] In this design, Let X be the value of the slot width w and the positioning slot depth b, and let s be the product of these two values. As s changes, the overall magnetization saturation of the motor also changes. With increasing X, the magnetization saturation increases, reaching ≥94% when X ≥ 0.01. The changes in motor performance and cost under different values ​​of s are described below. The benchmark is s=X=0.

[0029] in, and For per unit value, This represents the ratio of the torque value under different values ​​of X to the average torque when X=0. This represents the ratio of the motor cost under different values ​​of X to the motor cost when X=0. Per-unit value is a type of relative unit system. It is a commonly used numerical notation method in power system analysis and engineering calculations, representing the relative values ​​of various physical quantities and parameters, with the unit being pu (which can also be considered dimensionless). Per-unit values ​​are also widely used in power system calculations.

[0030] Specifically, when 0 ≤ X < 0.01, Although it is on an upward trend, The value is relatively large; however, within the range of 0.15 < X ≤ 0.35, as X increases, It is showing a downward trend, but It also shows a downward trend. That is to say, when 0.01≤X≤0.15, At a relatively good level, Maintaining it at a low level ensures average torque output, guarantees that motor performance is not affected, and also controls motor production costs, resulting in a high cost-performance ratio.

[0031] In one possible design, further, the width w of the slot and the radius R of the shaft hole... ir The pole pair number p of the lamination body satisfies 0 < w < πR ir / p.

[0032] In this design, the width w of the slot and the radius R of the shaft hole are... ir The fact that the number of pole pairs p of the lamination body satisfies the above relationship can improve the rationality of the slot size of the positioning slot, avoid the positioning slot being too narrow, which would make it difficult for the positioning slot to directly or indirectly indicate the position of the permanent magnet, and also avoid the problem that the positioning slot being too wide might reduce the strength of the rotor core. By associating the slot size of the positioning slot with the shaft hole and the number of pole pairs, the specific size setting of the positioning slot can be associated with other structural features, thereby improving its rationality.

[0033] In one possible design, further, the depth b of the locating groove, the minimum distance L between the mounting section and the center of the shaft hole, and the radius R of the shaft hole are... ir The condition is satisfied that 0 < b < LR. ir .

[0034] In this design, the depth b of the positioning groove and the radius R of the shaft hole are... irThe number of pole pairs p of the lamination body satisfies the above relationship, thereby improving the rationality of the groove depth of the positioning groove. This avoids the problem that the positioning groove is too shallow, making it difficult for the positioning groove to directly or indirectly indicate the position of the permanent magnet. It also avoids the problem that the rotor core strength may be reduced due to the groove depth being too deep. By linking the groove depth of the positioning groove with the shaft hole and the number of pole pairs, the specific size setting of the positioning groove can be linked with other structural features, thereby improving its rationality.

[0035] In one possible design, the included angle β between the center lines of adjacent magnetic poles and the number of pole pairs p of the lamination body satisfy β = 180° / p.

[0036] In this design, on the lamination body, the portion of the lamination body between two adjacent pole center lines can form a magnetic pole of the lamination body, and at least one permanent magnet is provided on a magnet.

[0037] Specifically, when the number of pole pairs p is 2, the number of magnetic poles is 4, and the angle β between the center lines of adjacent magnetic poles is 90°.

[0038] In one possible design, at least one positioning groove is located on the magnetic pole center line of the lamination body.

[0039] In this design, there is at least one positioning slot, located on the center line of the magnetic pole. This allows for the quick and accurate positioning of a single permanent magnet. Since the relative positions of multiple permanent magnets are fixed, the positions of other permanent magnets can be accurately determined based on the already positioned magnet. However, for designs where the positioning slot is not on the center line of the magnetic pole, the position of the permanent magnet needs to be calculated based on the relative positional relationship between the positioning slot and the permanent magnet. Compared to designs where the positioning slot is directly placed on the center line of the magnetic pole, the process of positioning the permanent magnet is slightly more complex.

[0040] The center of the positioning groove can be located on the magnetic pole center line, or it can be deflected by a preset angle relative to the magnetic pole center line. When determining the permanent magnet, the specific position of the permanent magnet can be quickly calculated using only the preset angle.

[0041] When there are multiple positioning slots, the number of positioning slots can be set to correspond to the number of magnetic poles, that is, one positioning slot corresponds to one magnetic pole.

[0042] In one possible design, the number of positioning slots n and the number of pole pairs p of the lamination body satisfy 1≤n≤2p.

[0043] In this design, the number of positioning slots, n, and the number of pole pairs, p, of the lamination body satisfy 1 ≤ n ≤ 2p. When the number of positioning slots, n, is 1, the position of the permanent magnet in one magnetic pole is determined by one positioning slot. Then, since the relative positions of the permanent magnets in adjacent magnetic poles are determined, the positions of adjacent permanent magnets can be calculated based on the already determined positions of the permanent magnets. The number of positioning slots is small, reducing the processing difficulty and minimizing the impact on the overall strength of the rotor core. When the number of positioning slots, n, is 2p, the positioning slots correspond one-to-one with the number of magnetic poles. The position of the permanent magnet on each magnetic pole is indicated by a corresponding positioning slot, allowing multiple magnetizing coils on the magnetizing fixture to be quickly positioned independently without interference and with small positioning deviations.

[0044] For example, when the number of p is 2, the number of positioning slots n can be 1, 2, 3, or 4.

[0045] It is worth noting that, on a cross section perpendicular to the axial direction, the outline of the cross section of the positioning groove wall includes at least one or any combination of circular arc, parabola, V-shape, U-shape, and bent straight line segment.

[0046] For example, the outline can be a "U" shape formed by bent straight line segments, an arc shape, or a combination of arc segments and straight line segments.

[0047] In one possible design, the rotor lamination further includes multiple magnet slots spaced around the shaft hole on the lamination body. The multiple magnet slots are used to mount permanent magnets. The slot wall of each magnet slot includes an inner slot wall near the shaft hole, wherein the mounting wall includes the inner slot wall.

[0048] In this design, the rotor lamination also includes multiple magnet slots, which are spaced around the shaft hole on the lamination body. These slots are used to install permanent magnets, meaning the permanent magnets are embedded.

[0049] In this configuration, each of the multiple magnet slots includes an inner slot wall near the shaft hole. The mounting wall includes the inner slot wall, which in turn includes a mounting section, which can be a straight line segment. The distance L between the straight line segment and the center of the shaft hole is specified.

[0050] Specifically, when the permanent magnet is placed in the magnet slot, the permanent magnet can contact the slot wall. The magnet slot facilitates the positioning and installation of the permanent magnet and also ensures the positional stability of the permanent magnet. When the permanent magnet located in the magnet slot rotates synchronously with the rotor lamination, the slot wall can provide multi-directional positional constraints for the permanent magnet, ensuring the positional stability of the rotor core and the permanent magnet.

[0051] In one possible design, each of the multiple magnet slots further includes an interconnected magnet segment and a magnetic isolation segment. The magnet segment is used to accommodate a permanent magnet. The portion of the lamination body located between the magnetic isolation segment and the outer periphery of the lamination body is a magnetic isolation bridge. The portion of the lamination body between adjacent magnet slots in the multiple magnet slots is a magnetic rib. The width a1 of the magnet segment, the width a2 of the magnetic isolation bridge, and the minimum width a3 of the magnetic rib satisfy a2≤a3<a1.

[0052] In this design, each of the multiple magnet slots includes a magnet section and a magnetic isolation section, which are interconnected. The magnet section houses the permanent magnets of the rotor, which are embedded within it. The magnetic isolation section is empty, as it contains no permanent magnets. There are two magnetic isolation sections, each connected to one side of the permanent magnet section. The portion of the lamination body located between two adjacent magnet slots is a magnetic rib. The specific shape of the magnetic rib is related to the shape of the magnet slot, and the width of the magnetic rib is related to the width of the magnetic isolation bridge and the width of the magnet section. This allows for a more rational arrangement of various positions on the periphery of the lamination body, thereby improving magnetic leakage, enhancing the quality of the motor's output torque, and ultimately improving motor performance.

[0053] In one possible design, the mounting wall further includes a portion of the outer peripheral wall of the lamination body.

[0054] In this design, the lamination body includes circumferentially oriented side surfaces. When the rotor lamination is located inside the stator core, the permanent magnet can be attached to the outer circumferential surface of the lamination body. When the rotor lamination is located outside the stator core, the permanent magnet is attached to the inner circumferential surface of the lamination body. It is worth noting that the permanent magnet is located between the rotor core and the stator core.

[0055] The permanent magnet can be glued to the rotor core, or it can be fixed to the rotor core by injection molding.

[0056] In one possible design, the rotor lamination further includes a rivet portion, which is located on the lamination body and on the interpole center line of the lamination body.

[0057] In this design, the rotor laminations also include rivet parts, which are located on the lamination body. Multiple rotor laminations are stacked axially to form a rotor core. The rivet parts on adjacent rotor laminations can be matched to allow multiple rotor laminations to be connected to each other axially, thereby forming a complete rotor core.

[0058] Furthermore, the rivet is located on the inter-pole center line of the lamination body. The positions of the rivet and the positioning groove are respectively related to the inter-pole center line and the magnetic pole center line of the lamination body. This can improve the quality of the motor output torque while improving motor performance, reduce magnetic leakage and suppress torque pulsation, achieve high power density and high efficiency, reduce rotational inertia and reduce motor weight.

[0059] It should be noted that, for the lamination body, there are multiple magnetic pole center lines and multiple inter-pole center lines. There are also multiple rivet parts, with one rivet part corresponding to one inter-pole center line. In one possible design, the number of rivet parts is further half the number of permanent magnet slots; or, the number of rivet parts is equal to the number of permanent magnet slots.

[0060] In one possible design, the number of rivet parts m further satisfies the same condition as the number of pole pairs p of the lamination body, where m = p or m = 2p.

[0061] In this design, the number of rivet parts is related to the number of pole pairs. Rationally setting the number of rivet parts can not only avoid the problem that the number of rivet parts is too small and the bonding strength between adjacent rotor laminations cannot be achieved, but also avoid the problems of complex structure and difficult processing caused by the number of rivet parts.

[0062] The even-numbered rivet parts are symmetrically distributed on the lamination body, which can also make the rotor laminations bear force evenly and improve the stability of the rotor core under high-speed rotation.

[0063] According to a second aspect of the invention, a rotor is provided, comprising rotor laminations provided by any of the above designs.

[0064] The rotor provided by the present invention includes rotor laminations provided by any of the above designs, and therefore has all the beneficial effects of the rotor laminations, which will not be repeated here.

[0065] According to a third aspect of the invention, an electric motor is provided, comprising a rotor provided by any of the above-described designs.

[0066] The motor provided by the present invention includes the rotor provided by any of the above designs, and therefore has all the beneficial effects of the rotor, which will not be repeated here.

[0067] According to a fourth aspect of the invention, a pump is provided, comprising a motor provided by any of the above-described designs.

[0068] The pump provided by the present invention includes the motor provided by any of the above designs, and therefore has all the beneficial effects of the motor, which will not be repeated here.

[0069] According to a fifth aspect of the invention, a vehicle is provided, comprising any one of the rotor laminations, rotor, motor, and pump provided in any of the above-described designs.

[0070] The vehicle provided by the present invention includes any of the rotor laminations, rotor, motor and pump provided by any of the above designs, and therefore has all the beneficial effects of any of the rotor laminations, rotor, motor and pump, which will not be repeated here.

[0071] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0072] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0073] Figure 1 A schematic diagram of the rotor lamination structure according to the first embodiment of this application is shown;

[0074] Figure 2 A partially enlarged view of the rotor laminations according to the first embodiment of this application is shown;

[0075] Figure 3 A graph showing the degree of magnetization saturation of a motor according to one embodiment of this application is shown;

[0076] Figure 4 A graph illustrating the performance and cost analysis of a motor according to one embodiment of this application is shown;

[0077] Figure 5 A schematic diagram of the rotor lamination structure according to a second embodiment of this application is shown;

[0078] Figure 6 A schematic diagram of the rotor lamination structure according to a third embodiment of this application is shown;

[0079] Figure 7 A schematic diagram of the rotor lamination structure according to the fourth embodiment of this application is shown;

[0080] Figure 8 A schematic diagram of the rotor structure according to the first embodiment of this application is shown;

[0081] Figure 9 A schematic diagram of the rotor structure according to the first embodiment of this application is shown.

[0082] The correspondence between the reference numerals and the component names is as follows:

[0083] 100 rotor laminations,

[0084] 110 Lamination body, 111 Shaft hole, 112 Mounting wall, 113 Magnetic bridge, 114 Magnetic rib.

[0085] 120 positioning slot,

[0086] 130 Magnet slot, 131 Magnet section, 132 Magnetic isolation section

[0087] 140 rivet part,

[0088] 200 rotor, 210 permanent magnet. Detailed Implementation

[0089] To better understand the above-mentioned objectives, features, and advantages of this application, the application 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.

[0090] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0091] The following reference Figures 1 to 9 The present application describes rotor lamination 100, rotor 200, motor, pump and vehicle provided according to some embodiments.

[0092] According to an embodiment of the first aspect of this application, such as Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, a rotor lamination 100 is provided. The rotor lamination 100 is used for a rotor 200. The rotor 200 includes a plurality of permanent magnets 210. The rotor lamination 100 includes a lamination body 110 and at least one positioning groove 120. The lamination body 110 is provided with a shaft hole 111. At least one positioning groove 120 is provided on the lamination body 110 and communicates with the shaft hole 111. At least one positioning groove 120 is used to directly or indirectly position the permanent magnets 210.

[0093] The rotor lamination 100 provided in this application is used in a rotor 200, which includes a plurality of permanent magnets 210. The plurality of rotor laminations 100 are stacked axially to form a rotor core, and the plurality of permanent magnets 210 are disposed on the rotor core. The rotor lamination 100 includes a lamination body 110 and at least one positioning groove 120. The lamination body 110 has a shaft hole 111 for accommodating a rotating shaft. Further, the shaft hole 111 is located in the middle of the lamination body 110. The positioning groove 120 is disposed on the lamination body 110 and communicates with the shaft hole 111. The positioning groove 120 is used to directly or indirectly position the permanent magnets 210. Without adding any components, the magnetization position of the permanent magnets 210 can be accurately located based on their position, thereby improving the overall magnetization accuracy, ensuring that the permanent magnets 210 are saturated with magnets, effectively solving the magnetization positioning problem, and minimizing motor weight and production costs while ensuring motor performance.

[0094] The rotor 200 has multiple permanent magnets 210, and the relative positions of the permanent magnets 210 on the rotor laminations 100 are fixed. There are one or more positioning slots 120. One positioning slot 120 has a fixed position on the lamination body 110, and the relative positions of the multiple permanent magnets 210 on the lamination body 110 are also fixed. Therefore, whether there is one or multiple positioning slots 120, accurate positioning of the multiple permanent magnets 210 can be achieved. When there is only one positioning slot 120, one positioning slot 120 can accurately locate the position of one permanent magnet 210. Then, based on the arrangement rules of the multiple permanent magnets 210 on the rotor 200, the positions of the other permanent magnets 210 can be inferred. When there are multiple positioning slots 120, the multiple positioning slots 120 are also spaced apart along the axial direction of the shaft holes 111, so that the multiple positioning slots 120 correspond one-to-one with the multiple permanent magnets 210. Thus, the accurate position of each permanent magnet 210 can be directly obtained through the positioning slots 120.

[0095] It should be noted that during the magnetization process, the magnetization fixture can be directly engaged with the positioning groove 120, thereby achieving direct positioning of the permanent magnet 210 by the positioning groove 120.

[0096] Alternatively, the rotor 200 includes a housing connected to the rotor core. The housing has a positioning structure that mates with the positioning slot 120. During the mating process between the housing and the rotor core, the positioning structure engages with the positioning slot 120, thus achieving the positioning and installation of the housing. During magnetization, the permanent magnet 210 is fixed in relative position to the positioning slot 120, the positioning slot 120 is fixed in relative position to the positioning structure, and the positioning structure on the housing is fixed in relative position to the magnetization fixture. This ensures that the relative positions of the permanent magnet 210 and the magnetization coil on the magnetization fixture are consistent, guaranteeing accurate magnetization direction and ensuring that the magnetic field after magnetization matches the design specifications, thereby increasing the magnetization saturation of the permanent magnet 210.

[0097] It is worth noting that the outer shell can be formed directly on the rotor core using injection molding. The bonding strength between the plastic-coated shell and the rotor core can effectively prevent external gases or liquids from contacting the rotor core or entering the interior of the rotor core through the plastic-coated shell, thereby preventing corrosion of the rotor core and playing a role in rust prevention.

[0098] In one possible embodiment, further, as Figures 1 to 9 As shown, the lamination body 110 also includes a mounting wall 112 for mounting the permanent magnet 210. The mounting wall 112 includes a mounting section located on the axial end face, and the positioning groove 120 includes a notch facing the center of the shaft hole 111. The lamination body 110 includes multiple magnetic pole centerlines. The minimum distance L between the mounting section and the center of the shaft hole 111, the width w of the notch, the depth b of the positioning groove 120, the included angle β between adjacent magnetic pole centerlines, and the radius R of the shaft hole 111 are also specified. ir The pole pairs p of the lamination body 110 satisfy the following: .

[0099] In this embodiment, the lamination body 110 further includes a mounting wall 112, which is used to mount the permanent magnet 210. When the permanent magnet 210 is embedded in the lamination body 110, the lamination body 110 has a magnet groove 130, and the mounting wall 112 is the groove wall of the magnet groove 130. When the permanent magnet 210 is surface-mounted in the lamination body 110, a portion of the outer or inner peripheral wall of the lamination body 110 is used to mount the permanent magnet 210.

[0100] Specifically, when the rotor 200 is located inside the stator, a portion of the outer peripheral wall of the lamination body 110 is a mounting wall 112; or, when the rotor 200 is located outside the stator, a portion of the inner peripheral wall of the lamination body 110 is a mounting wall 112.

[0101] The mounting wall 112 is a wall extending along the axial direction. The mounting wall 112 can be a straight wall or an arc-shaped wall. In a section perpendicular to the axial direction, the shape of the cross-section of the mounting wall 112 is the mounting segment. When the shape of the mounting wall 112 is different, the shape of the mounting segment is also different.

[0102] For example, when the mounting wall 112 is a straight wall, the mounting segment is a straight segment, which is suitable for embedded permanent magnets 210. When the permanent magnet 210 is a straight magnet, there are two straight segments: a first straight segment and a second straight segment. The first straight segment is positioned closer to the shaft hole 111 than the second straight segment. In this case, the minimum distance L between the mounting segment and the center of the shaft hole 111 is the distance between the first straight segment and the center of the shaft hole 111.

[0103] Alternatively, when the mounting wall 112 is an arc-shaped wall, the mounting section is an arc segment, which is suitable for surface-mount permanent magnets 210. The distance between the arc segment and the center of the shaft hole 111 is the radial length from the center of the shaft hole 111 to the arc segment.

[0104] Furthermore, the positioning groove 120 includes a notch facing the center of the shaft hole 111, that is, the notch of the positioning groove 120 faces the central axis of the shaft hole 111. The notch of the positioning groove 120 includes a first notch end point and a second notch end point, and the straight-line distance between the first notch end point and the second notch end point is the width of the notch of the positioning groove 120. The depth of the positioning groove 120 is the depth from the notch of the positioning groove 120 to the bottom of the positioning groove 120. When the bottom of the positioning groove 120 is flat, the depth of the positioning groove 120 is unique. When the bottom of the positioning groove 120 is not flat, such as an arc bottom, the depth of the positioning groove 120 has multiple depth values. In this case, the depth b of the positioning groove 120 is the maximum depth.

[0105] Alternatively, since the surfaces where the first and second slot endpoints are located are part of the cylindrical surface where the shaft hole 111 is located, the chord length of the arc between the first and second slot endpoints on the cross section perpendicular to the axial direction is the width of the slot opening of the positioning slot 120.

[0106] In this design, on the axial end face of the lamination body 110, the line connecting the midpoint of the mounting segment corresponding to the mounting wall 112 used to mount the permanent magnet 210 and the center of the shaft hole 111 is the magnetic pole center line. The dividing line between two adjacent magnetic pole center lines is called the inter-pole center line. When the mounting segment is a straight segment, it is the line connecting the midpoint of the straight segment and the center of the shaft hole 111. When the mounting segment is an arc segment, it is the line connecting the midpoint of the arc segment and the center of the shaft hole 111.

[0107] Furthermore, the minimum distance L between the mounting section and the center of the shaft hole 111, the width w of the slot, the depth b of the positioning slot 120, the included angle β between the center lines of adjacent magnetic poles, and the radius R of the shaft hole 111 are all considered.ir When the number of pole pairs p of the lamination body 110 satisfies the above formula, without adding any parts, optimizing the size of the positioning groove 120, the distance between the permanent magnet 210 and the shaft hole 111, and the size of the shaft hole 111 can effectively improve the magnetization saturation of the permanent magnet 210, reduce the weight of the motor to the greatest extent while ensuring motor performance, and reduce production costs.

[0108] The included angle β between the center lines of adjacent magnetic poles can be 30°, 45°, 90°, etc. The number of pole pairs in the lamination body 110 is related to the number of magnetic poles in the lamination body 110. The number of pole pairs p can be 2 or 4, corresponding to 4 or 8 magnetic poles. The number of permanent magnets 210 under each magnetic pole of the lamination body 110 is an integer greater than 1. For example, when the number of permanent magnets 210 under each magnetic pole is 1, the permanent magnets 210 can be in a straight line shape. When the number of permanent magnets 210 under each magnetic pole is 2, the permanent magnets 210 can be in a V-shape. When the number of permanent magnets 210 under each magnetic pole is 3, the permanent magnets 210 can be in a "+V" shape.

[0109] In one possible embodiment, further, the minimum distance L between the mounting segment and the center of the shaft hole 111, the width w of the slot, the depth b of the positioning slot 120, the included angle β between adjacent magnetic pole centerlines, and the radius R of the shaft hole 111 are also considered. ir The pole pairs p of the lamination body 110 satisfy the following: .

[0110] In this embodiment, Let X be the value of the slot width w and the depth b of the positioning slot 120. As s changes, the overall magnetization saturation of the motor also changes. Figure 3 As shown, the degree of magnetization saturation increases with the increase of X, and when X ≥ 0.01, the degree of magnetization saturation is ≥ 94%.

[0111] like Figure 4 The figure shows the variation in motor performance and cost under different values ​​of s. The benchmark is s=X=0.

[0112] in, and For per unit value, This represents the ratio of the torque value under different values ​​of X to the average torque when X=0. This represents the ratio of the motor cost under different values ​​of X to the motor cost when X=0. Per-unit value is a type of relative unit system. It is a commonly used numerical notation method in power system analysis and engineering calculations, representing the relative values ​​of various physical quantities and parameters, with the unit being pu (which can also be considered dimensionless). Per-unit values ​​are also widely used in power system calculations.

[0113] Specifically, when 0 ≤ X < 0.01, Although it is on an upward trend, The value is relatively large; however, within the range of 0.15 < X ≤ 0.35, as X increases, It is showing a downward trend, but It also shows a downward trend. That is to say, when 0.01≤X≤0.15, At a relatively good level, Maintaining it at a low level ensures average torque output, guarantees that motor performance is not affected, and also controls motor production costs, resulting in a high cost-performance ratio.

[0114] In one possible embodiment, the width w of the slot and the radius R of the shaft hole 111 are further... ir The pole pair number p of the lamination body 110 satisfies 0 < w < πR. ir / p.

[0115] In this embodiment, the width w of the slot and the radius R of the shaft hole 111 are... ir The fact that the number of pole pairs p of the lamination body 110 satisfies the above relationship can improve the rationality of the slot size of the positioning slot 120, avoid the positioning slot 120 being too narrow, which would make it difficult for the positioning slot 120 to directly or indirectly indicate the position of the permanent magnet 210, and also avoid the problem that the strength of the rotor core might be reduced if the slot size of the positioning slot 120 is too wide. By associating the slot size of the positioning slot 120 with the shaft hole 111 and the number of pole pairs, the specific size setting of the positioning slot 120 can be associated with other structural features, thereby improving its rationality.

[0116] In one possible embodiment, the depth b of the positioning groove 120, the minimum distance L between the mounting section and the center of the shaft hole 111, and the radius R of the shaft hole 111 are further specified. ir The condition is satisfied that 0 < b < LR. ir .

[0117] In this embodiment, the depth b of the positioning groove 120 and the radius R of the shaft hole 111 are... irThe number of pole pairs p of the lamination body 110 satisfies the above relationship, thereby improving the rationality of the groove depth of the positioning groove 120. This avoids the positioning groove 120 being too shallow, which would make it difficult for the positioning groove 120 to directly or indirectly indicate the position of the permanent magnet 210. It also avoids the problem that the groove depth of the positioning groove 120 may be too deep, which could lead to a reduction in the strength of the rotor core. By associating the groove depth of the positioning groove 120 with the shaft hole 111 and the number of pole pairs, the specific size setting of the positioning groove 120 can be associated with other structural features, thereby improving its rationality.

[0118] In one possible embodiment, the included angle β between adjacent magnetic pole centerlines and the number of pole pairs p of the lamination body 110 satisfy β = 180° / p.

[0119] In this embodiment, on the lamination body 110, the portion of the lamination body 110 between two adjacent pole center lines can form a magnetic pole of the lamination body 110, and at least one permanent magnet 210 is provided on a magnet.

[0120] Specifically, when the number of pole pairs p is 2, the number of magnetic poles is 4, and the angle β between the center lines of adjacent magnetic poles is 90°.

[0121] In one possible embodiment, at least one positioning groove 120 is located on the magnetic pole center line of the lamination body 110.

[0122] In this embodiment, there is at least one positioning slot 120, and one positioning slot 120 is located on the center line of the magnetic pole, thereby enabling the quick and accurate positioning of one permanent magnet 210. Since the relative positional relationship between multiple permanent magnets 210 is fixed, the positions of other permanent magnets 210 can be accurately obtained based on the already positioned permanent magnet 210. However, for schemes where the positioning slot 120 is not on the center line of the magnetic pole, the position of the permanent magnet 210 needs to be calculated based on the relative positional relationship between the positioning slot 120 and the permanent magnet 210 during the positioning process. Compared to the scheme where the positioning slot 120 is directly placed on the center line of the magnetic pole, the process of positioning the permanent magnet 210 is slightly more complex.

[0123] The center of the positioning groove 120 can be located on the magnetic pole center line, or it can be deflected by a preset angle relative to the magnetic pole center line. When determining the permanent magnet 210, the specific position of the permanent magnet 210 can be quickly calculated by using only the preset angle.

[0124] When there are multiple positioning slots 120, the number of positioning slots 120 can be set to correspond to the number of magnetic poles, that is, one positioning slot 120 corresponds to one magnetic pole.

[0125] In one possible embodiment, the number n of the positioning slots 120 and the number p of the pole pairs of the lamination body 110 satisfy 1≤n≤2p.

[0126] In this embodiment, the number n of positioning slots 120 and the number p of pole pairs of the lamination body 110 satisfy 1 ≤ n ≤ 2p. When the number n of positioning slots 120 is 1, the position of the permanent magnet 210 in a magnetic pole is determined by one positioning slot 120. Then, since the relative positions of the permanent magnets 210 in adjacent magnetic poles are determined, the positions of the adjacent permanent magnets 210 can be calculated based on the determined positions of the permanent magnets 210. The number of positioning slots 120 is small, reducing the processing difficulty and minimizing the impact on the overall strength of the rotor core. When the number n of positioning slots 120 is 2p, the positioning slots 120 correspond one-to-one with the number of magnetic poles. The position of the permanent magnet 210 on each magnetic pole will be indicated by the corresponding positioning slot 120, so that multiple magnetizing coils on the magnetizing fixture can be quickly positioned independently without interference, and the positioning deviation is small.

[0127] For example, when the number of p is 2, the number n of the positioning slots 120 can be 1, 2, 3, or 4.

[0128] It is worth noting that, on a cross section perpendicular to the axial direction, the outline of the cross section of the positioning groove 120 includes at least one or any combination of arc, parabola, V-shape, U-shape, and bent straight line segment.

[0129] For example, the outline can be a "U" shape formed by bent straight line segments, an arc shape, or a combination of arc segments and straight line segments.

[0130] In one possible embodiment, further, as Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the rotor lamination 100 also includes a plurality of magnet slots 130, which are spaced around the shaft hole 111 on the lamination body 110. The plurality of magnet slots 130 are used to install permanent magnets 210. The slot wall of each magnet slot 130 includes an inner slot wall near the shaft hole 111, wherein the mounting wall 112 includes the inner slot wall.

[0131] In this embodiment, the rotor lamination 100 also includes a plurality of magnet slots 130, which are spaced around the shaft hole 111 on the lamination body 110. The plurality of magnet slots 130 are used to install permanent magnets 210, that is, the permanent magnets 210 are embedded.

[0132] In this configuration, each of the multiple magnet slots 130 includes an inner slot wall near the shaft hole 111. The mounting wall 112 includes an inner slot wall, which includes a mounting section, which can be a straight line segment. The distance L between the straight line segment and the center of the shaft hole 111 is [missing information].

[0133] Specifically, when the permanent magnet 210 is placed in the magnet slot 130, the permanent magnet 210 can contact the slot wall of the magnet slot 130. The magnet slot 130 facilitates the positioning and installation of the permanent magnet 210 and can also ensure the positional stability of the permanent magnet 210. When the permanent magnet 210 located in the magnet slot 130 rotates synchronously with the rotor lamination 100, the slot wall of the magnet slot 130 can provide multi-directional positional constraints for the permanent magnet 210, ensuring the positional stability of the rotor core and the permanent magnet 210.

[0134] In one possible embodiment, each of the plurality of magnet slots 130 further includes a magnet segment 131 and a magnetic isolation segment 132 that are interconnected. The magnet segment 131 is used to accommodate the permanent magnet 210. The portion of the lamination body 110 located between the magnetic isolation segment 132 and the outer periphery of the lamination body 110 is a magnetic isolation bridge 113. The portion of the lamination body 110 between adjacent magnet slots 130 is a magnetic rib 114. The width a1 of the magnet segment 131, the width a2 of the magnetic isolation bridge 113, and the minimum width a3 of the magnetic rib 114 satisfy a2≤a3<a1.

[0135] In this embodiment, each of the plurality of magnet slots 130 includes a magnet section 131 and a magnetic isolation section 132, which are interconnected. The magnet section 131 is used to accommodate the permanent magnet 210 of the rotor 200, and the permanent magnet 210 is embedded in the magnet section 131. The magnetic isolation section 132 does not contain the permanent magnet 210, that is, the magnetic isolation section 132 is empty. There are two magnetic isolation sections 132, which are respectively connected to both sides of the permanent magnet 210 section 131. The portion of the lamination body 110 located between two adjacent magnet slots 130 is a magnetic rib 114. The specific shape of the magnetic rib 114 is related to the specific shape of the magnet slot 130. The width of the magnetic rib 114 is related to the width of the magnetic isolation bridge 113 and the width of the magnet section 131, making the arrangement of various positions on the periphery of the lamination body 110 more rational, thereby helping to improve the leakage magnetic phenomenon, improve the quality of the motor output torque, and thus improve the motor performance.

[0136] In one possible embodiment, further, as Figure 9 As shown, the mounting wall 112 includes a portion of the outer peripheral wall of the lamination body 110.

[0137] In this embodiment, the lamination body 110 includes a circumferential side surface. When the rotor lamination 100 is located inside the stator core, the permanent magnet 210 can be attached to the outer circumferential surface of the lamination body 110. When the rotor lamination 100 is located outside the stator core, the permanent magnet 210 is attached to the inner circumferential surface of the lamination body 110. It is worth noting that the permanent magnet 210 is located between the rotor core and the stator core.

[0138] The permanent magnet 210 can be glued to the rotor core, or the permanent magnet 210 can be fixed to the rotor core by injection molding.

[0139] In one possible embodiment, the rotor lamination 100 further includes a rivet portion 140, which is disposed on the lamination body 110 and located on the inter-pole center line of the lamination body 110.

[0140] In this embodiment, the rotor lamination 100 also includes a rivet portion 140, which is disposed on the lamination body 110. Multiple rotor laminations 100 are stacked axially to form a rotor core. The rivet portions 140 on adjacent rotor laminations 100 can be matched to allow multiple rotor laminations 100 to be connected to each other axially, thereby forming a rotor core as a whole.

[0141] Furthermore, the rivet part 140 is located on the inter-pole center line of the lamination body 110. The positions of the rivet part 140 and the positioning groove 120 are respectively related to the inter-pole center line and the magnetic pole center line of the lamination body 110. This can improve the quality of the motor output torque while improving the motor performance, improve the leakage flux phenomenon and suppress torque pulsation, achieve high power density and high efficiency, reduce rotational inertia and reduce motor weight.

[0142] It should be noted that, for the lamination body 110, there are multiple magnetic pole center lines and multiple inter-pole center lines. There are also multiple rivet portions 140, with one rivet portion 140 corresponding to one inter-pole center line. In one possible embodiment, the number of rivet portions 140 is further half the number of slots 130 in the permanent magnet 210; or, the number of rivet portions 140 is equal to the number of slots 130 in the permanent magnet 210.

[0143] In one possible embodiment, the number m of the rivet portions 140 further satisfies the same condition as the number of pole pairs p of the lamination body 110, where m = p or m = 2p.

[0144] In this embodiment, the number of rivet parts 140 is related to the number of pole pairs. Rationally setting the number of rivet parts 140 can not only avoid the problem that the number of rivet parts 140 is too small and the bonding strength between adjacent rotor laminations 100 cannot be achieved, but also avoid the problems of complex structure and difficult processing caused by the number of rivet parts 140 being too large.

[0145] Among them, the even number of rivet parts 140 are symmetrically distributed on the lamination body 110, which can also make the force on the rotor lamination 100 balanced and improve the stability of the rotor core under high-speed rotation.

[0146] According to an embodiment of the second aspect of this application, a rotor 200 is provided, including rotor laminations 100 provided by any of the above designs.

[0147] The rotor 200 provided by the present invention includes the rotor lamination 100 provided by any of the above designs, and therefore has all the beneficial effects of the rotor lamination 100, which will not be repeated here.

[0148] According to an embodiment of the third aspect of this application, an electric motor is provided, including a rotor 200 provided by any of the above designs.

[0149] The motor provided by the present invention includes the rotor 200 provided by any of the above designs, and therefore has all the beneficial effects of the rotor 200, which will not be repeated here.

[0150] According to an embodiment of the fourth aspect of this application, a pump is provided, including a motor provided by any of the above designs.

[0151] The pump provided by the present invention includes the motor provided by any of the above designs, and therefore has all the beneficial effects of the motor, which will not be repeated here.

[0152] According to an embodiment of the fifth aspect of this application, a vehicle is provided, including any one of the rotor lamination 100, rotor 200, motor and pump provided by any of the above designs.

[0153] The vehicle provided by the present invention includes any of the rotor lamination 100, rotor 200, motor and pump provided by any of the above designs, and therefore has all the beneficial effects of any of the rotor lamination 100, rotor 200, motor and pump, which will not be repeated here.

[0154] It's worth noting that the vehicle can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, and hydrogen engine vehicles. Of course, the vehicle can also be a traditional gasoline-powered vehicle.

[0155] Specifically, such as Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, the rotor lamination 100 provided in this application is used for a rotor 200, which includes a plurality of permanent magnets 210. The plurality of rotor laminations 100 are stacked axially to form a rotor core, and the plurality of permanent magnets 210 are disposed on the rotor core. The rotor lamination 100 includes a lamination body 110 and at least one positioning groove 120. The lamination body 110 is provided with a shaft hole 111 for accommodating a rotating shaft. Further, the shaft hole 111 is located at the center of the lamination body 110. The positioning groove 120 is provided on the lamination body 110 and is connected to the shaft hole 111. The positioning groove 120 is used to directly or indirectly position the permanent magnet 210. Without adding any parts, the magnetization position of the permanent magnet 210 can be accurately located based on its position, thereby improving the overall magnetization accuracy, ensuring that the permanent magnet 210 is saturated with magnetization, effectively solving the magnetization positioning problem, and minimizing the weight of the motor while ensuring motor performance and reducing production costs.

[0156] The rotor 200 has multiple permanent magnets 210, and the relative positions of the permanent magnets 210 on the rotor laminations 100 are fixed. There are one or more positioning slots 120. One positioning slot 120 has a fixed position on the lamination body 110, and the relative positions of the multiple permanent magnets 210 on the lamination body 110 are also fixed. Therefore, whether there is one or multiple positioning slots 120, accurate positioning of the multiple permanent magnets 210 can be achieved. When there is only one positioning slot 120, one positioning slot 120 can accurately locate the position of one permanent magnet 210. Then, based on the arrangement rules of the multiple permanent magnets 210 on the rotor 200, the positions of the other permanent magnets 210 can be inferred. When there are multiple positioning slots 120, the multiple positioning slots 120 are also spaced apart along the axial direction of the shaft holes 111, so that the multiple positioning slots 120 correspond one-to-one with the multiple permanent magnets 210. Thus, the accurate position of each permanent magnet 210 can be directly obtained through the positioning slots 120.

[0157] It should be noted that during the magnetization process, the magnetization fixture can be directly engaged with the positioning groove 120, thereby achieving direct positioning of the permanent magnet 210 by the positioning groove 120.

[0158] Alternatively, the rotor 200 includes a housing connected to the rotor core. The housing has a positioning structure that mates with the positioning slot 120. During the mating process between the housing and the rotor core, the positioning structure engages with the positioning slot 120, thus achieving the positioning and installation of the housing. During magnetization, the permanent magnet 210 is fixed in relative position to the positioning slot 120, the positioning slot 120 is fixed in relative position to the positioning structure, and the positioning structure on the housing is fixed in relative position to the magnetization fixture. This ensures that the relative positions of the permanent magnet 210 and the magnetization coil on the magnetization fixture are consistent, guaranteeing accurate magnetization direction and ensuring that the magnetic field after magnetization matches the design specifications, thereby increasing the magnetization saturation of the permanent magnet 210.

[0159] It is worth noting that the outer shell can be formed directly on the rotor core using injection molding. The bonding strength between the plastic-coated shell and the rotor core can effectively prevent external gases or liquids from contacting the rotor core or entering the interior of the rotor core through the plastic-coated shell, thereby preventing corrosion of the rotor core and playing a role in rust prevention.

[0160] In one possible embodiment, further, as Figures 1 to 9 As shown, the lamination body 110 also includes a mounting wall 112, which is used to mount the permanent magnet 210. When the permanent magnet 210 is embedded in the lamination body 110, the lamination body 110 has a magnet groove 130, and the mounting wall 112 is the groove wall of the magnet groove 130. When the permanent magnet 210 is surface-mounted in the lamination body 110, a portion of the outer or inner peripheral wall of the lamination body 110 is used to mount the permanent magnet 210.

[0161] Specifically, when the rotor 200 is located inside the stator, a portion of the outer peripheral wall of the lamination body 110 is a mounting wall 112; or, when the rotor 200 is located outside the stator, a portion of the inner peripheral wall of the lamination body 110 is a mounting wall 112.

[0162] The mounting wall 112 is a wall extending along the axial direction. The mounting wall 112 can be a straight wall or an arc-shaped wall. In a section perpendicular to the axial direction, the shape of the cross-section of the mounting wall 112 is the mounting segment. When the shape of the mounting wall 112 is different, the shape of the mounting segment is also different.

[0163] For example, when the mounting wall 112 is a straight wall, the mounting segment is a straight segment, which is suitable for embedded permanent magnets 210. When the permanent magnet 210 is a straight magnet, there are two straight segments: a first straight segment and a second straight segment. The first straight segment is positioned closer to the shaft hole 111 than the second straight segment. In this case, the minimum distance L between the mounting segment and the center of the shaft hole 111 is the distance between the first straight segment and the center of the shaft hole 111.

[0164] Alternatively, when the mounting wall 112 is an arc-shaped wall, the mounting section is an arc segment, which is suitable for surface-mount permanent magnets 210. The distance between the arc segment and the center of the shaft hole 111 is the radial length from the center of the shaft hole 111 to the arc segment.

[0165] Furthermore, the positioning groove 120 includes a notch facing the center of the shaft hole 111, that is, the notch of the positioning groove 120 faces the central axis of the shaft hole 111. The notch of the positioning groove 120 includes a first notch end point and a second notch end point, and the straight-line distance between the first notch end point and the second notch end point is the width of the notch of the positioning groove 120. The depth of the positioning groove 120 is the depth from the notch of the positioning groove 120 to the bottom of the positioning groove 120. When the bottom of the positioning groove 120 is flat, the depth of the positioning groove 120 is unique. When the bottom of the positioning groove 120 is not flat, such as an arc bottom, the depth of the positioning groove 120 has multiple depth values. In this case, the depth b of the positioning groove 120 is the maximum depth.

[0166] Alternatively, since the surfaces where the first and second slot endpoints are located are part of the cylindrical surface where the shaft hole 111 is located, the chord length of the arc between the first and second slot endpoints on the cross section perpendicular to the axial direction is the width of the slot opening of the positioning slot 120.

[0167] In this design, on the axial end face of the lamination body 110, the line connecting the midpoint of the mounting segment corresponding to the mounting wall 112 used to mount the permanent magnet 210 and the center of the shaft hole 111 is the magnetic pole center line. The dividing line between two adjacent magnetic pole center lines is called the inter-pole center line. When the mounting segment is a straight segment, it is the line connecting the midpoint of the straight segment and the center of the shaft hole 111. When the mounting segment is an arc segment, it is the line connecting the midpoint of the arc segment and the center of the shaft hole 111.

[0168] Furthermore, when the minimum distance L between the center of the mounting section and the shaft hole 111, the width w of the slot, the depth b of the positioning slot 120, the included angle β between the center lines of adjacent magnetic poles, the radius Rir of the shaft hole 111, and the number of pole pairs p of the lamination body 110 satisfy the above formulas, without adding any parts, optimizing the size of the positioning slot 120, the distance between the permanent magnet 210 and the shaft hole 111, and the size of the shaft hole 111 can effectively improve the magnetization saturation of the permanent magnet 210, minimize the weight of the motor while ensuring motor performance, and reduce production costs.

[0169] The included angle β between the center lines of adjacent magnetic poles can be 30°, 45°, 90°, etc. The number of pole pairs in the lamination body 110 is related to the number of magnetic poles in the lamination body 110. The number of pole pairs p can be 2 or 4, corresponding to 4 or 8 magnetic poles. The number of permanent magnets 210 under each magnetic pole of the lamination body 110 is an integer greater than 1. For example, when the number of permanent magnets 210 under each magnetic pole is 1, the permanent magnets 210 can be in a straight line shape. When the number of permanent magnets 210 under each magnetic pole is 2, the permanent magnets 210 can be in a V-shape. When the number of permanent magnets 210 under each magnetic pole is 3, the permanent magnets 210 can be in a "+V" shape.

[0170] In this application, the term "multiple" refers to two or more unless otherwise expressly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" 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 application based on the specific circumstances.

[0171] 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 this application. 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.

[0172] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A rotor lamination, characterized in that, The rotor laminations are used in a rotor, which includes a plurality of permanent magnets. The rotor laminations include: A lamination body, wherein the lamination body is provided with a shaft hole; At least one positioning groove is provided on the lamination body, at least one positioning groove is connected to the shaft hole, and at least one positioning groove is used to directly or indirectly position the permanent magnet; The lamination body also includes a mounting wall for mounting the permanent magnet. The mounting wall includes a mounting section located on the axial end face. The positioning groove includes a slot facing the center of the shaft hole. The lamination body includes multiple magnetic pole centerlines. The minimum distance L between the mounting section and the center of the shaft hole, the width w of the slot, the depth b of the positioning slot, the included angle β between adjacent magnetic pole centerlines, and the radius R of the shaft hole. ir The pole pair number p of the lamination body satisfies, 。 2. The rotor lamination according to claim 1, characterized in that, The width w of the slot and the radius R of the shaft hole ir The pole pair number p of the lamination body satisfies 0 < w < πR. ir / p.

3. The rotor lamination according to claim 1, characterized in that, The depth b of the positioning groove, the minimum distance L between the mounting section and the center of the shaft hole, and the radius R of the shaft hole. ir ,satisfy, 0<b<L-R ir 。 4. The rotor lamination according to claim 1, characterized in that, The included angle β between adjacent magnetic pole centerlines and the number of pole pairs p of the lamination body satisfy β = 180° / p.

5. The rotor lamination according to any one of claims 1 to 4, characterized in that, At least one of the positioning grooves is located on the magnetic pole center line of the lamination body.

6. The rotor lamination according to any one of claims 1 to 4, characterized in that, The number of positioning slots n and the number of pole pairs p of the lamination body satisfy 1≤n≤2p.

7. The rotor lamination according to any one of claims 1 to 4, characterized in that, The rotor laminations also include: Multiple magnet slots are spaced around the shaft hole on the lamination body. The multiple magnet slots are used to install the permanent magnet. The slot wall of each magnet slot includes an inner slot wall near the shaft hole, wherein the mounting wall includes the inner slot wall.

8. The rotor lamination according to claim 7, characterized in that, Each of the plurality of magnet slots includes an interconnected magnet segment and a magnetic isolation segment. The magnet segment is used to accommodate the permanent magnet. The portion of the lamination body located between the magnetic isolation segment and the outer periphery of the lamination body forms a magnetic isolation bridge. The portion of the lamination body between adjacent magnet slots in the plurality of magnet slots forms a magnetic rib. The width a1 of the magnet segment, the width a2 of the magnetic isolation bridge, and the minimum width a3 of the magnetic rib satisfy the following conditions: a2≤a3<a1.

9. The rotor lamination according to any one of claims 1 to 4, characterized in that, The mounting wall includes a portion of the outer peripheral wall of the lamination body.

10. The rotor lamination according to any one of claims 1 to 4, characterized in that, The rotor laminations also include: A rivet is provided on the lamination body, and the rivet is located on the interpole center line of the lamination body; The number m of the rivet portions satisfies the same condition as the number p of the pole pairs of the lamination body, where m = p or m = 2p.

11. A rotor, characterized in that, include: The rotor lamination as described in any one of claims 1 to 10.

12. An electric motor, characterized in that, include: The rotor as described in claim 11.

13. A pump, characterized in that, include: The motor as described in claim 12.

14. A vehicle, characterized in that, include: Rotor laminations as described in any one of claims 1 to 10; or The rotor as described in claim 11; or The motor as described in claim 12; or The pump as claimed in claim 13.

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