Rotor laminations, rotor cores, rotors, motors, and vehicles

Abstract

The present invention provides a rotor punching, a rotor core, a rotor, a motor and a vehicle, wherein the rotor punching comprises a punching body, an axial hole, a plurality of mounting parts and an air gap slot. The axial hole is provided on the punching body. The plurality of mounting parts are provided on the punching body around the axial hole, and each of the plurality of mounting parts comprises a plurality of magnet slots. The plurality of magnet slots comprises a first magnet slot, which is arranged on the punching body away from the axial hole, and the first magnet slot comprises a first straight slot wall away from the axial hole, and the plane where the first straight slot wall is located is a first end face. The air gap slot is provided on the punching body and is located between the first magnet slot and the outer edge of the punching body. In one design of the present invention, the air gap slot is located on the side of the first end face away from the axial hole, thereby ensuring that the air gap slot does not affect the dq axis magnetic circuit of the motor while effectively improving the magnetic leakage of the rotor punching, increasing the permanent magnet torque of the motor, and further improving the utilization rate of the permanent magnet.

Description

Technical Field

[0001] The present invention relates to the technical field of motor equipment, and in particular to a rotor punching sheet, a rotor core, a rotor, a motor and a vehicle. Background Art

[0002] Currently, to improve magnet demagnetization and magnetic leakage in interior permanent magnet synchronous motors (IPMS), and to increase magnet utilization, a common approach is to reduce the width of the rotor's magnetic isolation bridges. However, at high motor speeds, the rotor's magnetic isolation bridges experience significant forces, while narrower bridges are insufficient to maintain the required rotor structural strength at high speeds. Therefore, improving rotor structural strength while reducing magnetic leakage has become a pressing issue. 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] To this end, a first aspect of the present invention is to provide a rotor lamination.

[0005] A second aspect of the present invention is to provide a rotor core.

[0006] A third aspect of the present invention is to provide a rotor.

[0007] A fourth aspect of the present invention is to provide an electric motor.

[0008] A fifth aspect of the present invention is to provide a vehicle.

[0009] In view of this, according to a first aspect of the present invention, a rotor punching sheet is provided, comprising a punching sheet body, an axial hole, a plurality of mounting portions and an air gap slot. The axial hole is provided on the punching sheet body. The plurality of mounting portions are provided on the punching sheet body around the axial hole, and each of the plurality of mounting portions comprises a plurality of magnet slots. The plurality of magnet slots comprises a first magnet slot, the first magnet slot is arranged on the punching sheet body away from the axial hole, the first magnet slot comprises a first straight slot wall away from the axial hole, and the plane where the first straight slot wall is located is the first end face. The air gap slot is provided on the punching sheet body and is located between the first magnet slot and the outer edge of the punching sheet body, and the air gap slot is located on the side of the first end face facing away from the axial hole.

[0010] The rotor punching provided by the present invention comprises a punching body, an axial hole, multiple mounting portions, and an air gap slot. The axial hole is provided in the punching body, which is a magnetic steel body. The axial hole is used to mount the rotor shaft. Multiple mounting portions are arranged around the axial hole on the punching body. It is worth noting that the structures of each of the multiple mounting portions can be identical or partially identical, and can be adjusted according to actual needs. Each mounting portion includes multiple magnet slots for mounting the rotor's permanent magnets. The multiple magnet slots include a first magnet slot, which is arranged on the punching body away from the axial hole relative to the other magnet slots. The first magnet slot includes a first straight slot wall away from the axial hole, with the plane of the first straight slot wall being the first end face. It is worth noting that when the first permanent magnet is mounted in the first magnet slot, the first straight slot wall is the slot wall located on the side of the first permanent magnet away from the axial hole. A gap is provided between the first straight slot wall and the first permanent magnet. The presence of a gap between the first straight slot wall and the first permanent magnet facilitates the installation of the first permanent magnet. The punching sheet body also includes an air gap groove, which is arranged on the punching sheet body. On the one hand, the air gap groove is located between the first magnet slot and the outer edge of the punching sheet body, so the air gap groove can divide the part of the punching sheet body located between the first magnet slot and the punching sheet body into two magnetic isolation bridges, one of the two magnetic isolation bridges is close to the first magnet slot, and the other of the two magnetic isolation bridges is close to the outer edge of the punching sheet body. The double magnetic isolation bridge structure can improve the mechanical strength of the rotor punching sheet, optimize the rotor magnetic field distribution, significantly improve the electromagnetic torque of the motor with the rotor punching sheet, effectively improve the leakage magnetic field and demagnetization of the permanent magnet located in the magnet slot, and disperse the rotor punching sheet in high-speed operation. The centrifugal stress around the magnet slot is reduced during operation, thereby solving the problem that the mechanical strength of the rotor punching sheet of the motor cannot meet the requirements at high speed, and realizing the design of low leakage magnetic field and high strength motor. In addition, the utilization rate of the permanent magnet and the power density of the motor can be significantly improved, further improving the working performance of the motor. At the same time, it can also weaken the motor torque pulsation to a certain extent, reduce the running noise of the motor, and improve the user comfort. On the other hand, the air gap slot is located on the side of the first end face away from the shaft hole, so that the air gap slot can effectively improve the leakage magnetic field of the punching sheet body while not affecting the dq axis magnetic circuit of the motor, thereby ensuring sufficient permanent magnet torque of the motor.

[0011] Specifically, the air gap slot being located on the side of the first end face facing away from the shaft hole can also be interpreted as requiring the minimum vertical spacing Lmin between any point in the air gap slot and the first end face to be greater than 0. This ensures that magnetic flux leakage is reduced while maintaining the dq-axis magnetic circuits of the motor, thereby ensuring sufficient reluctance torque of the motor.

[0012] The cross-section of the air gap groove is a closed triangle, quadrilateral, polygon, or an irregular geometric shape composed of a triangle, quadrilateral, polygon, and a circular arc. Each mounting portion includes two air gap grooves, which have the same shape and size, and a relatively regular structure, which is easy to process and form.

[0013] In a possible design, further, the air gap groove is located between the end of the first magnet groove and the outer edge of the punching sheet body.

[0014] In this design, the air gap groove is located between the end of the first magnet slot and the outer edge of the punching body. On the one hand, by arranging the air gap groove between the first magnet slot and the outer edge of the punching body to form a double magnetic bridge structure, the structural stress of the rotor at high speed can be effectively improved, the deformation of the rotor can be reduced, and the rotor punching can be prevented from being deformed or broken by the centrifugal force when running at high speed, thereby enhancing the overall structural strength of the rotor punching; on the other hand, by arranging the air gap groove between the end of the first magnet slot and the outer edge of the punching body, that is, arranging the first air gap groove at the end of the first magnet slot with larger leakage magnetic field, the end leakage magnetic field of the permanent magnet arranged in the first magnet slot can be effectively reduced, thereby improving the utilization rate of the permanent magnet.

[0015] In a possible design, further, the punching sheet body includes a first magnetic isolation bridge, the first magnetic isolation bridge is located between the air gap slot and the first magnet slot, the first magnetic isolation bridge has a first magnetic isolation end and a second magnetic isolation end that are opposite to each other, and the width of the first magnetic isolation end is different from the width of the second magnetic isolation end.

[0016] In this design, the part of the punching sheet body located between the air gap slot and the first magnet slot is the first magnetic isolation bridge. The first magnetic isolation bridge has a first magnetic isolation end and a second magnetic isolation end that are opposite to each other, and the width of the first magnetic isolation end is different from the width of the second magnetic isolation end, that is, the width of each point on the first magnetic isolation bridge is not all equal. One end of the first magnetic isolation bridge can reach saturation and limit leakage magnetic flux, and the other end of the first magnetic isolation bridge can disperse the stress of the punching sheet to ensure sufficient mechanical strength of the rotor punching sheet.

[0017] In a possible design, further, the number of air gap slots is two, and the two air gap slots are respectively arranged at the two ends of the first magnet slot, and the part of the punching sheet body located between the two air gap slots and the first magnet slot is the first body, the first magnetic isolation end is located between the second magnetic isolation end and the first body, and the width of the second magnetic isolation end is greater than the width of the first magnetic isolation end and is less than or equal to 4 times the width of the first magnetic isolation end.

[0018] In this design, there are two air gap slots, which are respectively arranged at the two ends of the first magnet slot. The punching sheet body also includes a first body, which is located between the two air gap slots and the first magnet slot, that is, the first body is located on the side of the first magnet slot away from the shaft hole. The first magnetic isolation end is located between the second magnetic isolation end and the first body, that is, the first magnetic isolation end is close to the first body, and the second magnetic isolation end is far away from the first body, wherein the width of the first magnetic isolation end is smaller than the width of the second magnetic isolation end, that is, the first magnetic isolation bridge as a whole is narrow at the top and wide at the bottom, similar to a trapezoid. When the magnetic flux passes through the first magnetic isolation end of the first magnetic isolation bridge, it reaches saturation at the narrower first magnetic isolation end, thereby limiting magnetic leakage, while the wider second magnetic isolation end fully plays a role in dispersing the magnetic flux of the punching sheet and protecting the rotor punching sheet to have sufficient mechanical strength. Furthermore, the width of the second magnetic shielding end is greater than the width of the first magnetic shielding end and is less than or equal to four times the width of the first magnetic shielding end. Specifically, the width of the second magnetic shielding end is t2, and the width of the first magnetic shielding end is t1, where t2 ≥ k × t1, k∈(1, 4). When the width t1 of the first magnetic shielding end and the width t2 of the second magnetic shielding end satisfy the aforementioned relationship, it is beneficial to rationally allocate the size of the first magnetic shielding bridge, thereby improving the structural strength of the rotor punching and preventing magnetic leakage. It is worth noting that k is in the range of 1 to 4. For example, the value of k can be 1.5, 1.8, 2.6, 3.4, or 3.7.

[0019] In a possible design, further, the width of the first magnetic isolation end is greater than or equal to the thickness of the punching sheet body.

[0020] In this design, the width t1 of the first magnetic isolation end is greater than or equal to the thickness of the punching body. By making the minimum width of the first magnetic isolation bridge greater than the thickness of the rotor punching, it is possible to prevent any part of the trapezoidal first magnetic isolation bridge from being too thin and breaking, thereby improving the strength of the rotor punching and improving the reliability of the rotor punching.

[0021] In a possible design, further, the first magnet slot includes a middle section and an extension section, wherein the middle section is used to accommodate the permanent magnet of the rotor, and the extension section is arranged at an end of the middle section and communicates with the middle section.

[0022] In this design, the first magnet slot consists of a middle section and an extension section. The middle section is used to accommodate the rotor's permanent magnets and includes the first straight slot wall. The extension sections are located at both ends of the middle section and are connected to the middle section. The permanent magnets are not located within the extension sections. That is, when a permanent magnet is inserted into the first magnet slot, it only fills the middle section of the first magnet slot, while air fills the extension section of the first magnet slot. In this case, the extension section can suppress magnetic flux leakage at the ends of the permanent magnet.

[0023] In a possible design, further, the minimum distance between two air gap grooves is d1; the width of the middle section is w1; the number of extension sections is two, the two extension sections are respectively connected to the two ends of the middle section, and the maximum distance between the two extension sections is w2, wherein:

[0024] In this design, the minimum distance between the two air gap slots is d1. The two air gap slots refer to the two air gap slots located at both ends of the first magnet slot. The width of the middle section is w1. A permanent magnet is disposed within the middle section. The width of the middle section is equal to the width of the permanent magnet, and thus the width of the middle section is also equal to the width of the permanent magnet. There are two extension sections, one connected to each end of the middle section. The maximum distance between the two extension sections is w2. When the minimum distance d1 between the two air gap slots, the width w1 of the middle section (permanent magnet), and the maximum distance w2 between the two extension sections meet the above relationship, the air gap slots can achieve a more uniform magnetic field distribution and a more regular electromagnetic torque waveform without affecting the main magnetic circuit of the rotor laminations, thereby reducing motor torque pulsation. This also prevents excessive air gap slot size from causing excessive equivalent magnetic resistance of the magnetic circuit and reducing the electromagnetic torque of the motor.

[0025] In a possible design, further, the angle formed by the center of the two air gap grooves and the center line of the shaft hole is θ, the outer radius of the punch body is r, and the maximum radial width of the first body is h1, wherein:

[0026] In this design, the cross-section of the air gap slot is a geometric shape and / or a non-geometric shape. When the cross-section of the air gap slot is a geometric shape, the center of the air gap slot is the center of the geometric shape. When the cross-section of the air gap slot is a non-geometric shape, the center of the air gap slot is the intersection of the line connecting the two points farthest apart in the circumferential direction and the line connecting the two points farthest apart in the radial direction. The two air gap slots include a first air gap slot and a second air gap slot. The center of the first air gap slot is the first center, the center of the second air gap slot is the second center, the center of the axial hole is the axis, and the angle formed by the first center, the second center, and the axis is θ. The value of θ can represent the relative size and position of any air gap slot set at the end of any mounting portion. Specifically, the larger θ is, the larger the air gap slot is, and the better the improvement effect on the magnetic leakage at the motor end; the smaller θ is, the smaller the air gap slot is, and the worse the improvement effect on the magnetic leakage at the motor end. When the angle θ, the width w1 of the middle section, the maximum distance w2 between the two extension sections, the outer radius r of the punch body, and the maximum radial width h1 of the first body satisfy the above relationship, the position and size of the air gap slot can be relatively optimized. This effectively adjusts the magnetic field distribution, improves permanent magnet magnetic leakage and demagnetization, and reduces motor torque pulsation while ensuring excellent mechanical strength of the rotor punch. At the same time, it also prevents the air gap slot from being too large, which would lead to an excessively large equivalent magnetic resistance of the magnetic circuit and avoid a reduction in the electromagnetic torque of the motor.

[0027] Specifically, let Then x is in the range of 1 to 1.3. Further, x can be 1.05, 1.1, 1.15, 1.2, 1.25, etc.

[0028] In a possible design, further, the first magnetic isolation bridge has a magnetic bridge side close to the air gap slot, and the length of the magnetic bridge side is L1, wherein:

[0029] In this design, the first magnetic bridge has a magnetic bridge edge near the air gap slot. The length L1 of the magnetic bridge edge satisfies the above relationship. This allows the air gap slot to achieve a more uniform magnetic field distribution and a more regular electromagnetic torque waveform without affecting the main magnetic circuit of the rotor laminations, thereby reducing motor torque pulsation. It also prevents an excessively large air gap slot from causing an excessively large equivalent magnetic resistance of the magnetic circuit and reducing the electromagnetic torque of the motor. The first magnetic bridge also has a magnetic isolation edge near the first magnet slot. The lengths of the magnetic bridge edge and the magnetic isolation edge can be equal or different, and can be adjusted according to actual conditions.

[0030] In a possible design, the punch body further includes a second magnetic isolation bridge, the second magnetic isolation bridge is located between the air gap groove and the outer edge of the punch body, and the width h of the second magnetic isolation bridge is greater than or equal to the thickness of the punch body.

[0031] In this design, the second magnetic isolation bridge is located between the air gap groove and the outer edge of the punch body. Specifically, the second magnetic isolation bridge is an arc-shaped magnetic isolation bridge. The minimum width of the second magnetic isolation bridge is greater than or equal to the thickness of the rotor punch, thereby preventing the outer peripheral portion of the rotor punch from being too thin and easily broken, thereby improving the strength of the rotor punch and improving the reliability of the rotor. It is worth noting that when the second magnetic isolation bridge is an equal-width magnetic isolation bridge, the width of the second magnetic isolation bridge is the average width of the second magnetic isolation bridge. When the second magnetic isolation bridge is an unequal-width magnetic isolation bridge, the width of the second magnetic isolation bridge refers to the minimum width.

[0032] In a possible design, further, the width h of the second magnetic isolation bridge is smaller than the width t1 of the first magnetic isolation end.

[0033] In this design, the width h of the second magnetic isolation bridge is smaller than the width t1 of the first magnetic isolation end. Due to the dual magnetic bridge structure achieved by the air gap slots, the structural stress of any magnetic bridge segment on the first magnetic isolation bridge is greater than that of the second magnetic isolation bridge. If the first magnetic isolation end of the first magnetic isolation bridge is smaller than the second magnetic isolation end, and the width t1 of the first magnetic isolation end meets the structural strength requirements, then the structural strength of the second magnetic isolation bridge will inevitably meet the structural strength requirements. By making the width h of the second magnetic isolation bridge smaller than the width t1 of the first magnetic isolation end, the second magnetic isolation bridge can be made narrower, further suppressing end magnetic leakage and improving the utilization rate of the permanent magnets.

[0034] In a possible design, further, the multiple magnet slots also include two second magnet slots, the two second magnet slots are arranged on the punch body, each of the two second magnet slots has an inner end close to the shaft hole and an outer end away from the shaft hole, the two inner ends are close to each other, and the two outer ends are away from each other, and the first magnet slot is arranged between the two outer ends.

[0035] In this design, the multiple magnet slots include two second magnet slots, which are arranged on the punch body. Each second magnet slot has an inner end close to the axial hole and an outer end away from the axial hole. The two inner ends are close to each other, and the two outer ends are away from each other. That is, the two second magnet slots are arranged in a V-shape on the punch body. Furthermore, at least a portion of the first magnet slot is located between the two outer ends, and the three magnet slots are arranged in a triangular shape on the punch body. It is worth noting that one mounting portion includes three magnet slots.

[0036] According to a second aspect of the present invention, a rotor core is provided, comprising rotor punchings provided by any of the above designs.

[0037] The rotor core provided by the present invention includes the rotor punchings provided by any of the above designs, and therefore has all the beneficial effects of the rotor punchings, which will not be described in detail here.

[0038] According to a third aspect of the present invention, a rotor is provided, comprising the rotor core in any of the above designs.

[0039] The rotor provided by the present invention includes the rotor core provided by any of the above designs, and therefore has all the beneficial effects of the rotor core, which will not be described in detail here.

[0040] Furthermore, the magnet slots of the rotor punchings of the rotor core penetrate along the axial direction of the rotor core to form slots. The rotor also includes a plurality of permanent magnets, which are arranged in a one-to-one correspondence in the plurality of slots.

[0041] In one possible design, the plurality of slots further includes a first slot, wherein the first magnet slots of the plurality of rotor laminations form the first slot, and the middle sections of the first magnet slots constitute the middle slots of the slots. The plurality of permanent magnets includes a first permanent magnet, which is inserted into the middle slot, and the width of the first permanent magnet is equal to the width of the middle slot.

[0042] In this design, the first magnet slots of multiple rotor laminations are stacked to form a first slot, with the middle section of the first slot forming the middle slot. A first permanent magnet is inserted into the middle slot, with its width equal to that of the middle slot. A gap exists between the first permanent magnet and the first straight slot wall of the middle slot, facilitating assembly.

[0043] According to a fourth aspect of the present invention, a motor is provided, comprising a rotor provided by any of the above designs.

[0044] 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 described in detail here.

[0045] Furthermore, the motor further includes a stator, the stator structure forms an assembly cavity, the rotor is arranged in the assembly cavity, and the rotor can rotate relative to the stator.

[0046] According to a fifth aspect of the present invention, a vehicle is provided, comprising a motor provided by any of the above designs.

[0047] The vehicle provided in one design of 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 described in detail here.

[0048] It is worth noting that the vehicle can be a new energy vehicle, which includes pure electric vehicles, extended-range electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0049] Furthermore, the motor provided by any of the above designs can serve as a vehicle's drive motor. Specifically, the drive motor can independently activate the vehicle's functional devices. Alternatively, the drive motor can work in conjunction with other drive devices on the vehicle to ensure the normal operation of the vehicle's functional devices. The vehicle's functional devices can include any one or any combination of the following: wheels, air conditioners, lighting components, etc.

[0050] In a possible design, further, the vehicle includes a vehicle body, and the motor is installed in the vehicle body.

[0051] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0053] Figure 1 A schematic structural diagram of a rotor punching according to an embodiment of the present invention is shown;

[0054] Figure 2 Shown Figure 1 The shown diagram is a partial enlarged view of a rotor punching at position A in one embodiment of the present invention;

[0055] Figure 3 Shown Figure 2 The enlarged partial view of the rotor punching at position B in one embodiment of the present invention is shown;

[0056] Figure 4 Shown Figure 2 The enlarged partial view of the rotor punching at position C in one embodiment of the present invention is shown;

[0057] Figure 5 A schematic structural diagram of a rotor punching according to another embodiment of the present invention is shown;

[0058] Figure 6 Shown Figure 5 The shown diagram is a partial enlarged view of a rotor punching at position D in one embodiment of the present invention;

[0059] Figure 7 A comparison diagram of torque waveforms of a rotor punching according to an embodiment of the present invention and a rotor punching in the related art is shown;

[0060] Figure 8 A torque curve diagram is shown for different air gap slot positions in a rotor punching according to an embodiment of the present invention;

[0061] Figure 9A torque pulsation curve diagram is shown for different air gap slot positions in a rotor punching according to an embodiment of the present invention.

[0062] in, Figures 1 to 6 The corresponding relationship between the reference numerals and component names is as follows:

[0063] 1 rotor punching,

[0064] 10 punch body,

[0065] 101 first magnetic isolation bridge, 101a first magnetic isolation end, 101b second magnetic isolation end, 101c magnetic bridge edge, 102 second magnetic isolation bridge,

[0066] 103The first ontology,

[0067] 11 shaft holes,

[0068] 12 mounting parts, 120 magnet slots,

[0069] 121 first magnet slot, 121a first straight slot wall, 121b middle section, 121c extension section,

[0070] 122 second magnet slot,

[0071] 13 air gap slots,

[0072] 20 permanent magnet, 20a first permanent magnet. DETAILED DESCRIPTION

[0073] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0074] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0075] Refer to the following Figures 1 to 6 The present invention provides a rotor sheet, a rotor core, a rotor, a motor and a vehicle according to some embodiments of the present invention.

[0076] Example 1

[0077] According to a first aspect of the present invention, there is provided a rotor punching 1, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 6As shown, it includes a punch body 10, an axial hole 11, a plurality of mounting parts 12 and an air gap groove 13. The axial hole 11 is provided on the punch body 10. The plurality of mounting parts 12 are provided on the punch body 10 around the axial hole 11, and each of the plurality of mounting parts 12 includes a plurality of magnet grooves 120. The plurality of magnet grooves 120 include a first magnet groove 121, which is arranged on the punch body 10 away from the axial hole 11. The first magnet groove 121 includes a first straight groove wall 121a away from the axial hole 11, and the plane where the first straight groove wall 121a is located is the first end face. The air gap groove 13 is provided on the punch body 10 and is located between the first magnet groove 121 and the outer edge of the punch body 10. The air gap groove 13 is located on the side of the first end face facing away from the axial hole 11.

[0078] The rotor punching 1 provided by the present invention includes a punching body 10, an axial hole 11, a plurality of mounting portions 12 and an air gap slot 13. The axial hole 11 is provided on the punching body 10, and the punching body 10 is a magnetic steel body. The axial hole 11 is used to assemble the rotating shaft of the rotor. The plurality of mounting portions 12 are arranged on the punching body 10 around the axial hole 11. It is worth noting that the structure of each of the plurality of mounting portions 12 can be the same or partially the same, and can be adjusted according to actual needs. Each mounting portion 12 includes a plurality of magnet slots 120, and the magnet slots 120 are used to assemble the permanent magnets 20 of the rotor. The plurality of magnet slots 120 include a first magnet slot 121, which is arranged on the punching body 10 away from the axial hole 11 relative to the other magnet slots 120, and the first magnet slot 121 includes a first straight slot wall 121a away from the axial hole 11, and the plane where the first straight slot wall 121a is located is the first end face. It is worth noting that when the first permanent magnet 20a is installed in the first magnet slot 121, the first straight slot wall 121a is the slot wall located on the side of the first permanent magnet 20a away from the shaft hole 11. A gap is provided between the first straight slot wall 121a and the first permanent magnet 20a. The gap between the first straight slot wall 121a and the first permanent magnet 20a facilitates the installation of the first permanent magnet 20a. The sheet body 10 also includes an air gap groove 13, which is arranged on the sheet body 10. On the one hand, the air gap groove 13 is located between the first magnet groove 121 and the outer edge of the sheet body 10, and the air gap groove 13 can divide the part of the sheet body 10 located between the first magnet groove 121 and the sheet body 10 into two magnetic isolation bridges, one of the two magnetic isolation bridges is close to the first magnet groove 121, and the other of the two magnetic isolation bridges is close to the outer edge of the sheet body 10. The double magnetic isolation bridge structure can improve the mechanical strength of the rotor sheet 1, optimize the rotor magnetic field distribution, significantly improve the electromagnetic torque of the motor with the rotor sheet 1, and effectively improve the leakage magnetic field and demagnetization of the permanent magnet 20 located in the magnet groove 120. The centrifugal stress around the magnet slot 120 of the scattered rotor punching 1 under high speed working conditions is solved, thereby solving the problem that the mechanical strength of the rotor punching 1 of the motor is difficult to meet the requirements under high speed, and realizing the design of low leakage magnetic field and high strength motor. In addition, it can also significantly improve the utilization rate of the permanent magnet 20 and the power density of the motor, further improve the working performance of the motor, and at the same time, to a certain extent, it can also weaken the motor torque pulsation, reduce the operating noise of the motor, and improve the user's comfort; on the other hand, the air gap slot 13 is located on the side of the first end face away from the shaft hole 11, so that the air gap slot 13 can effectively improve the leakage magnetic field of the punching body 10 while not affecting the dq axis magnetic circuit of the motor, thereby ensuring sufficient magnetic resistance torque of the motor.

[0079] A large amount of experimental data shows that Figure 7As shown in the figure, under the test conditions where the other structures of the rotor punching 1 are the same, the first structure of the rotor punching 1: the punching body 10 is not provided with the air gap groove 13, and the second structure of the rotor punching 1: the punching body 10 is provided with the air gap groove 13. By comparison, it can be seen that when the rotor punching 1 is provided with the air gap groove 13, the electromagnetic torque of the motor is increased and the torque ripple of the motor is also reduced to a certain extent.

[0080] Specifically, if Figure 4 As shown, the air gap slot 13 is located on the side of the first end face facing away from the shaft hole 11. This can also be interpreted as the minimum vertical spacing Lmin between any point in the air gap slot 13 and the first end face being greater than 0. This ensures that the dq-axis magnetic circuit of the motor is not affected while ensuring sufficient reluctance torque of the motor while improving magnetic flux leakage.

[0081] Among them, such as Figure 2 、 Figure 3 、 Figure 4 and Figure 6 As shown, the cross-section of the air gap groove 13 is a closed triangle, quadrilateral, polygon, or an irregular geometric shape composed of a triangle, quadrilateral, polygon, and a circular arc. Each mounting portion 12 includes two air gap grooves 13. The two air gap grooves 13 have the same shape and size, and the structure is relatively regular, which is easy to process and form.

[0082] Furthermore, the air gap groove 13 is located between the end of the first magnet groove 121 and the outer edge of the punching sheet body 10 .

[0083] In this embodiment, Figure 1 、 Figure 5 and Figure 6 As shown, the air gap groove 13 is located between the end of the first magnet slot 121 and the outer edge of the punch body 10. On the one hand, by arranging the air gap groove 13 between the first magnet slot 121 and the outer edge of the punch body 10 to form a double magnetic bridge structure, the structural stress of the rotor at high speed can be effectively improved, the deformation of the rotor can be reduced, and the rotor punching 1 can be prevented from being deformed or broken by the centrifugal force when running at high speed, thereby enhancing the overall structural strength of the rotor punching 1; on the other hand, by arranging the air gap groove 13 between the end of the first magnet slot 121 and the outer edge of the punch body 10, that is, arranging the first air gap groove 13 at the end of the first magnet slot 121 with larger leakage magnetic field, the end leakage magnetic field of the permanent magnet 20 arranged in the first magnet slot 121 can be reduced, thereby improving the utilization rate of the permanent magnet 20.

[0084] Further, if Figure 2 and Figure 3As shown, the punch body 10 includes a first magnetic isolation bridge 101, which is located between the air gap slot 13 and the first magnet slot 121. The first magnetic isolation bridge 101 has a first magnetic isolation end 101a and a second magnetic isolation end 101b that are opposite to each other, and the width of the first magnetic isolation end 101a is different from the width of the second magnetic isolation end 101b.

[0085] In this embodiment, the portion of the punching sheet body 10 located between the air gap slot 13 and the first magnet slot 121 is the first magnetic isolation bridge 101. The first magnetic isolation bridge 101 has a first magnetic isolation end 101a and a second magnetic isolation end 101b that are opposite to each other, and the width of the first magnetic isolation end 101a is different from the width of the second magnetic isolation end 101b, that is, the width of each point on the first magnetic isolation bridge 101 is not all equal. One end of the first magnetic isolation bridge 101 can reach saturation and limit leakage magnetic flux, and the other end of the first magnetic isolation bridge 101 can disperse the stress of the punching sheet, thereby ensuring sufficient mechanical strength of the rotor punching sheet 1.

[0086] Further, if Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, there are two air gap slots 13, and the two air gap slots 13 are respectively arranged at the two ends of the first magnet slot 121. The part of the punching body 10 located between the two air gap slots 13 and the first magnet slot 121 is the first body 103. The first magnetic isolation end 101a is located between the second magnetic isolation end 101b and the first body 103. The width of the second magnetic isolation end 101b is greater than the width of the first magnetic isolation end 101a and is less than or equal to 4 times the width of the first magnetic isolation end 101a.

[0087] In this embodiment, there are two air gap slots 13, and the two air gap slots 13 are respectively arranged at the two ends of the first magnet slot 121. The punching body 10 also includes a first body 103, which is located between the two air gap slots 13 and the first magnet slot 121, that is, the first body 103 is located on the side of the first magnet slot 121 away from the shaft hole 11. The first magnetic isolation end 101a is located between the second magnetic isolation end 101b and the first body 103, that is, the first magnetic isolation end 101a is close to the first body 103, and the second magnetic isolation end 101b is away from the first body 103, wherein the width of the first magnetic isolation end 101a is smaller than the width of the second magnetic isolation end 101b, that is, the first magnetic isolation bridge 101 is generally narrow at the top and wide at the bottom, similar to a trapezoid. When the magnetic flux passes through the first magnetic isolation end 101a of the first magnetic isolation bridge 101, it reaches saturation at the narrow first magnetic isolation end 101a, thereby limiting magnetic leakage. The wider second magnetic isolation end 101b fully disperses the lamination profit and protects and increases the mechanical strength of the rotor lamination 1. Furthermore, the width of the second magnetic isolation end 101b is greater than the width of the first magnetic isolation end 101a, and is less than or equal to 4 times the width of the first magnetic isolation end 101a. Specifically, the width of the second magnetic isolation end 101b is t2, and the width of the first magnetic isolation end 101a is t1, where t2 ≥ k × t1, k ∈ (1, 4). When the width t1 of the first magnetic isolation end 101a and the width t2 of the second magnetic isolation end 101b meet the aforementioned relationship, it is beneficial to reasonably allocate the size of the first magnetic isolation bridge 101, thereby improving the structural strength and magnetic leakage of the rotor lamination 1. It is worth noting that k is in the range of 1 to 4. For example, the value of k can be 1.5, 1.8, 2.6, 3.4, or 3.7.

[0088] Furthermore, the width of the first magnetic isolation end 101 a is greater than or equal to the thickness of the punching sheet body 10 .

[0089] In this embodiment, the width t1 of the first magnetic isolation end 101a is greater than or equal to the thickness of the punching body 10. By making the minimum width of the first magnetic isolation bridge 101 greater than the thickness of the rotor punching 1, it is possible to prevent any part of the trapezoidal first magnetic isolation bridge 101 from being too thin and breaking, thereby improving the strength of the rotor punching 1 and improving the reliability of the rotor punching 1.

[0090] Furthermore, if Figure 3 As shown, the first magnet slot 121 includes a middle section 121b and an extension section 121c. The middle section 121b is used to accommodate the permanent magnet 20 of the rotor. The extension section 121c is provided at the end of the middle section 121b and communicates with the middle section 121b.

[0091] In this embodiment, the first magnet slot 121 includes a middle section 121b and an extension section 121c. The middle section 121b is used to accommodate the permanent magnet 20 of the rotor, and the middle section 121b includes a first straight slot wall 121a. The extension sections 121c are arranged at both ends of the middle section 121b and are connected to the middle section 121b. The permanent magnet 20 is not arranged in the extension section 121c. That is, when the permanent magnet 20 is inserted into the first magnet slot 121, the permanent magnet 20 can only fill the middle section 121b of the first magnet slot 121, and the air fills the extension section 121c of the first magnet slot 121. At this time, the extension section 121c can suppress the leakage of magnetic flux at the end of the permanent magnet 20.

[0092] Further, if Figure 2 As shown, the minimum distance between the two air gap grooves 13 is d1; the width of the middle section 121b is w1; the number of the extension sections 121c is two, and the two extension sections 121c are respectively connected to the two ends of the middle section 121b, and the maximum distance between the two extension sections 121c is w2, wherein:

[0093] In this embodiment, the minimum distance between the two air gap slots 13 is d1. The two air gap slots 13 refer to the two air gap slots 13 located at both ends of the first magnet slot 121. The width of the middle section 121b is w1. The permanent magnet 20 is disposed in the middle section 121b. The width of the middle section 121b is equal to the width of the permanent magnet 20, and thus the width of the middle section 121b is also equal to the width of the permanent magnet 20. There are two extension sections 121c, and the two extension sections 121c are respectively connected to the two ends of the middle section 121b, and the maximum distance between the two extension sections 121c is w2. Among them, when the minimum distance d1 between the two air gap slots 13, the width of the middle section 121b (permanent magnet 20) is w1 and the maximum distance w2 between the two extension sections 121c satisfy the above relationship, the air gap slot 13 can make the magnetic field distribution more uniform and the electromagnetic torque waveform more regular without affecting the main magnetic circuit of the rotor punching 1, which can help reduce the motor torque pulsation. At the same time, it can also prevent the air gap slot 13 from being too large, resulting in excessive equivalent magnetic resistance of the magnetic circuit and reducing the electromagnetic torque of the motor.

[0094] Further, if Figure 1 、 Figure 2 、 Figure 8 and Figure 9 As shown, the angle formed by the center of the two air gap grooves 13 and the center line of the shaft hole 11 is θ, the outer radius of the punch body 10 is r, and the maximum radial width of the first body 103 is h1, wherein:

[0095]

[0096] In this embodiment, the cross-section of the air gap slot 13 is geometric and / or non-geometric. When the cross-section of the air gap slot 13 is geometric, the center of the air gap slot 13 is the center of the geometric shape. When the cross-section of the air gap slot 13 is non-geometric, the center of the air gap slot 13 is the intersection of the line connecting the two points farthest apart in the circumferential direction and the line connecting the two points farthest apart in the radial direction. The two air gap slots 13 include a first air gap slot 13 and a second air gap slot 13. The center of the first air gap slot 13 is the first center, the center of the second air gap slot 13 is the second center, and the center of the axial hole 11 is the axis. The angle formed by the first center, the second center, and the axis is θ. The value of θ can represent the relative size and position of any air gap slot 13 located at the end of any mounting portion 12. Specifically, the larger θ is, the larger the air gap slot 13 is, and the better the improvement effect on motor end magnetic flux leakage; the smaller θ is, the smaller the air gap slot 13 is, and the worse the improvement effect on motor magnetic flux leakage. When the angle θ, the width w1 of the middle section 121b, the maximum distance w2 between the two extension sections 121c, the outer radius r of the lamination body 10, and the maximum radial width h1 of the first body 103 satisfy the above relationship, the position and size of the air gap slot 13 can be relatively optimized, thereby effectively adjusting the magnetic field distribution, improving the leakage and demagnetization of the permanent magnet 20, and reducing the motor torque pulsation while ensuring the excellent mechanical strength of the rotor lamination 1. At the same time, it can also prevent the air gap slot 13 from being too large, which would lead to an excessively large equivalent magnetic resistance of the magnetic circuit, thereby avoiding a reduction in the electromagnetic torque of the motor.

[0097] Specifically, let Then x is in the range of 1 to 1.3, further, x can be 1.05, 1.1, 1.15, 1.2, 1.25, etc. Figure 8 and Figure 9 As shown, when other structures on the rotor punching sheet 1 are determined, for example, the width w1 of the middle section 121b of the first magnet slot 121, the maximum distance w2 between the two extension sections 121c, and the outer radius r of the punching sheet body 10 are all fixed, then by changing the positions of the two air gap slots 13, the angle θ is adjusted so that x is within the range of 1 to 1.3, thereby avoiding the reduction of the motor torque and reducing the motor torque pulsation. Figure 8 As shown in Figure 2, when x is in the range of 1 to 1.3, the motor torque is large and stable above 320Nm. Figure 9 As shown in the figure, the torque ripple of the motor is low at this time, less than 9%.

[0098] Further, if Figure 2 and Figure 3 As shown, the first magnetic isolation bridge 101 has a magnetic bridge edge 101c close to the air gap slot 13, and the length of the magnetic bridge edge 101c is L1, wherein:

[0099] In this embodiment, the first magnetic bridge has a magnetic bridge edge 101c proximate to the air gap slot 13. The length L1 of the magnetic bridge edge 101c satisfies the aforementioned relationship. This allows the air gap slot 13 to achieve a more uniform magnetic field distribution and a more regular electromagnetic torque waveform without affecting the main magnetic circuit of the rotor lamination 1, thereby reducing motor torque pulsation. This also prevents excessive air gap slot 13 from causing an excessively large equivalent magnetic resistance of the magnetic circuit and reducing the electromagnetic torque of the motor. The first magnetic bridge also has a magnetic isolation edge proximate to the first magnet slot 121. The lengths of the magnetic bridge edge 101c and the magnetic isolation edge can be equal or unequal, and can be adjusted according to actual conditions.

[0100] Further, if Figure 2 and Figure 3 As shown, the punch body 10 further includes a second magnetic isolation bridge 102, which is located between the air gap groove 13 and the outer edge of the punch body 10. The width h of the second magnetic isolation bridge 102 is greater than or equal to the thickness of the punch body 10.

[0101] In this embodiment, the second magnetic isolation bridge 102 is located between the air gap groove 13 and the outer edge of the punch body 10. Specifically, the second magnetic isolation bridge 102 is an arc-shaped magnetic isolation bridge. The minimum width of the second magnetic isolation bridge 102 is greater than or equal to the thickness of the rotor punch 1, thereby preventing the outer peripheral portion of the rotor punch 1 from being too thin and easily broken, thereby improving the strength of the rotor punch 1 and improving the reliability of the rotor. It is worth noting that when the second magnetic isolation bridge 102 is an equal-width magnetic isolation bridge, the width of the second magnetic isolation bridge 102 is the average width of the second magnetic isolation bridge 102. When the second magnetic isolation bridge 102 is an unequal-width magnetic isolation bridge, the width of the second magnetic isolation bridge 102 refers to the minimum width.

[0102] Further, if Figure 3 As shown, the width h of the second magnetic isolation bridge 102 is smaller than the width t1 of the first magnetic isolation end 101 a.

[0103] In this embodiment, the width h of the second magnetic isolation bridge 102 is less than the width t1 of the first magnetic isolation end 101a. Due to the dual magnetic bridge structure achieved by the air gap slot 13, the structural stress of any magnetic bridge segment on the first magnetic isolation bridge 101 is greater than that of the second magnetic isolation bridge 102. Where the first magnetic isolation end 101a of the first magnetic isolation bridge 101 is smaller than the second magnetic isolation end 101b, and the width t1 of the first magnetic isolation end 101a meets the structural strength requirements, the structural strength of the second magnetic isolation bridge 102 will inevitably meet the structural strength requirements. By making the width h of the second magnetic isolation bridge 102 smaller than the width t1 of the first magnetic isolation end 101a, the second magnetic isolation bridge 102 can be made narrower, thereby further suppressing end magnetic leakage and improving the utilization rate of the permanent magnet 20.

[0104] Example 2

[0105] Different from the above embodiment, in this embodiment, the other magnet slots 120 in the mounting portion 12 are described. Figure 1 and Figure 5 As shown, the multiple magnet slots 120 also include two second magnet slots 122, and the two second magnet slots 122 are arranged on the punch body 10. Each of the two second magnet slots 122 has an inner end close to the shaft hole 11 and an outer end away from the shaft hole 11, the two inner ends are close to each other, and the two outer ends are away from each other, and the first magnet slot 121 is arranged between the two outer ends.

[0106] In this embodiment, the plurality of magnet slots 120 include two second magnet slots 122, which are disposed on the sheet body 10. Each second magnet slot 122 has an inner end proximal to the axial hole 11 and an outer end distal to the axial hole 11. The two inner ends are close to each other, while the two outer ends are distal to each other. In other words, the two second magnet slots 122 are arranged in a V-shape on the sheet body 10. Furthermore, at least a portion of the first magnet slot 121 is located between the two outer ends, resulting in the three magnet slots 120 being arranged in a triangular shape on the sheet body 10. It is worth noting that one mounting portion 12 includes three magnet slots 120.

[0107] Furthermore, the rotor lamination 1 includes a magnetic isolation slot, formed on the lamination body 10 and located between the two proximal ends. A magnetic isolation element can be placed within the magnetic isolation slot to further enhance structural strength and reduce magnetic leakage and demagnetization. The magnetic isolation element can be made of a non-magnetic material, such as injection molding material or metal.

[0108] Example 3

[0109] According to a second aspect of the present invention, a rotor core is provided, comprising the rotor punching 1 provided in any one of the above embodiments.

[0110] The rotor core provided by the present invention includes the rotor punching 1 provided by any of the above embodiments, and therefore has all the beneficial effects of the rotor punching 1, which will not be described in detail here.

[0111] Example 4

[0112] According to a third aspect of the present invention, a rotor is provided, comprising the rotor core according to any one of the above embodiments.

[0113] The rotor provided by the present invention includes the rotor core provided by any of the above embodiments, and therefore has all the beneficial effects of the rotor core, which will not be described in detail here.

[0114] Furthermore, the magnet slots 120 of the rotor sheets 1 of the rotor core are connected in the axial direction of the rotor core to form slots. The rotor further includes a plurality of permanent magnets 20, which are arranged in a one-to-one correspondence in the plurality of slots.

[0115] Furthermore, the plurality of slots include a first slot, wherein the first magnet slots 121 of the plurality of rotor sheets 1 form the first slot, and the middle section 121b of the first magnet slot 121 constitutes the middle slot of the slot. The plurality of permanent magnets 20 include a first permanent magnet 20a, which is inserted into the middle slot, and the width of the first permanent magnet 20a is equal to the width of the middle slot.

[0116] In this embodiment, the first magnet slots 121 of multiple rotor laminations 1 are stacked to form a first slot, with the middle section 121b of the first slot forming the intermediate slot. A first permanent magnet 20a is inserted into the intermediate slot, with the width of the first permanent magnet 20a being equal to that of the intermediate slot. A gap exists between the first permanent magnet 20a and the first straight slot wall 121a of the intermediate slot, facilitating assembly.

[0117] Example 5

[0118] According to a fourth aspect of the present invention, a motor is provided, comprising the rotor provided by any one of the above embodiments.

[0119] The motor provided by the present invention includes the rotor provided by any of the above embodiments, and therefore has all the beneficial effects of the rotor, which will not be described in detail here.

[0120] Furthermore, the motor further includes a stator, the stator structure forms an assembly cavity, the rotor is arranged in the assembly cavity, and the rotor can rotate relative to the stator.

[0121] Example 6

[0122] According to a fifth aspect of the present invention, a vehicle is provided, comprising the motor provided by any one of the above embodiments.

[0123] The vehicle provided in one embodiment of the present invention includes the motor provided in any of the above embodiments, and therefore has all the beneficial effects of the motor, which will not be described in detail here.

[0124] It is worth noting that the vehicle can be a new energy vehicle, which includes pure electric vehicles, extended-range electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0125] Furthermore, the motor provided in the above embodiment can be used as a vehicle drive motor. Specifically, the drive motor can independently activate the vehicle's functional devices. Alternatively, the drive motor can work in conjunction with other drive devices on the vehicle to ensure the normal operation of the vehicle's functional devices. The vehicle's functional devices can include any one or any combination of the following: wheels, air conditioners, lighting components, etc.

[0126] Furthermore, the vehicle includes a vehicle body, and the motor is installed in the vehicle body.

[0127] In the present invention, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; and "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0128] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these 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 any one or more embodiments or examples.

[0129] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A rotor punching, characterized in that: include: Film processing body; An axial hole is provided on the punch body; A plurality of mounting portions are arranged on the punch body around the shaft hole, each of the plurality of mounting portions comprising a plurality of magnet slots, wherein: The plurality of magnet slots include a first magnet slot, the first magnet slot is arranged on the punch body away from the shaft hole, the first magnet slot includes a first straight slot wall away from the shaft hole, and the plane where the first straight slot wall is located is a first end surface; an air gap groove, provided on the punch body and located between the first magnet groove and the outer edge of the punch body, the air gap groove being located on a side of the first end surface facing away from the shaft hole; The punching sheet body includes a first magnetic isolation bridge, the first magnetic isolation bridge is located between the air gap slot and the first magnet slot, the first magnetic isolation bridge has a first magnetic isolation end and a second magnetic isolation end that are separated from each other, and the width of the first magnetic isolation end is different from the width of the second magnetic isolation end; The rotor punching sheet further includes a magnetic isolation groove, which is provided on the punching sheet body; A magnetic isolation body is provided in the magnetic isolation groove; The punch body further includes a second magnetic isolation bridge, wherein the second magnetic isolation bridge is located between the air gap groove and the outer edge of the punch body; The width h of the second magnetic isolation bridge is greater than or equal to the thickness of the punching sheet body; The width h of the second magnetic isolation bridge is smaller than the width t1 of the first magnetic isolation end; The minimum vertical distance between any point in the air gap groove and the first end surface is greater than 0.

2. The rotor punching according to claim 1, characterized in that: The air gap groove is located between the end of the first magnet groove and the outer edge of the punching sheet body.

3. The rotor punching according to claim 2, characterized in that: There are two air gap slots, and the two air gap slots are respectively arranged at both ends of the first magnet slot. The part of the punching sheet body located between the two air gap slots and the first magnet slot is the first body, and the first magnetic isolation end is located between the second magnetic isolation end and the first body, wherein, The width of the second magnetic isolation end is greater than the width of the first magnetic isolation end and is less than or equal to 4 times the width of the first magnetic isolation end.

4. The rotor punching according to claim 3, characterized in that: The width of the first magnetic isolation end is greater than or equal to the thickness of the punching sheet body.

5. The rotor punching according to claim 3 or 4, characterized in that: The first magnet slot comprises: a middle section, the middle section being used to accommodate the permanent magnet; The extension section is arranged at the end of the middle section and is connected to the middle section.

6. The rotor punching according to claim 5, characterized in that: The minimum distance between two air gap slots is d1; The width of the middle section is w1; There are two extension sections, each of which is connected to the two ends of the middle section. The maximum distance between the two extension sections is w2, where:

7. The rotor punching according to claim 6, characterized in that: The angle formed by the center of the two air gap grooves and the center line of the shaft hole is θ, the outer radius of the punch body is r, and the maximum radial width of the first body is h1, wherein:

8. The rotor punching according to claim 6, characterized in that: The first magnetic isolation bridge has a magnetic bridge side close to the air gap slot, and the length of the magnetic bridge side is L1, wherein:

9. The rotor punching according to any one of claims 1 to 4, characterized in that The plurality of magnet slots further comprises: Two second magnet slots are arranged on the punch body, and each of the two second magnet slots has an inner end close to the shaft hole and an outer end away from the shaft hole. The two inner ends are close to each other, and the two outer ends are away from each other. The first magnet slot is arranged between the two outer ends.

10. A rotor core, characterized in that: include: A rotor lamination according to any one of claims 1 to 9.

11. A rotor for a motor, characterized in that: include: The rotor core according to claim 10, The magnet slots of the plurality of rotor punchings of the rotor core penetrate the rotor core in the axial direction to form slots; A plurality of permanent magnets are disposed in the plurality of slots in a one-to-one correspondence.

12. The rotor according to claim 11, characterized in that The plurality of slots include: A first slot, wherein the first magnet slots of the plurality of rotor punchings form the first slot, and the middle section of the first magnet slot constitutes the middle slot of the slot; The plurality of permanent magnets include: A first permanent magnet is inserted into the middle slot, and a width of the first permanent magnet is equal to a width of the middle slot.

13. A motor, characterized in that: include: a stator, wherein the stator is configured to form an assembly cavity; as well as The rotor according to claim 11 or 12, wherein the rotor is arranged in the assembly cavity.

14. A vehicle, characterized in that: include: vehicle body; and The motor according to claim 13, wherein the motor is installed in the vehicle body.

Images