Rotor lamination, rotor core, electric machine, compressor and means of transport

Abstract

This invention provides a rotor lamination, a rotor core, a motor, a compressor, and a transportation vehicle. The rotor lamination has a first air slot and a second air slot. The first air slot near its outer periphery is closed. There are two or more of both the first and second air slots, distributed around a central shaft hole and alternately arranged along the circumference of the rotor lamination. The second air slot has an opening near its outer periphery, which communicates with a second tangential magnet receiving portion. The length of the first tangential magnet receiving portion of the first air slot is L1, and the length of the second tangential magnet receiving portion is L2. L1 and L2 satisfy the condition: 0.91 ≤ L1 / L2 ≤ 1. This rotor lamination optimizes the air gap magnetic flux density, increases magnetic flux and power density, reduces motor harmonic content, lowers noise, and improves motor operating efficiency.

Description

Technical Field

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

[0002] A current permanent magnet synchronous motor features magnetic isolation bridges above and below the magnetic poles formed by two adjacent permanent magnets. Simultaneously, the outer contours of the magnetic poles are planar-cut. This structural design allows the rotor to generate very high magnetic flux at each pole, effectively increasing the magnetic flux density in the air gap. Furthermore, the tangential distribution of the permanent magnets further enhances this effect. Additionally, the pole-cutting treatment weakens harmonics and reduces cogging torque, improving motor efficiency. However, this design results in an uneven increase in the air magnetic field along the circumferential direction, leading to significant torque pulsation and affecting the smoothness of motor operation. Summary of the Invention

[0003] The primary objective of this invention is to provide a rotor lamination that optimizes air gap magnetic flux density, increases magnetic flux and power density, reduces motor harmonic content, lowers noise, and improves motor operating efficiency.

[0004] A second objective of the present invention is to provide a rotor core employing the aforementioned rotor laminations.

[0005] A third objective of this invention is to provide an electric motor employing the aforementioned rotor core.

[0006] A fourth objective of the present invention is to provide a compressor employing the aforementioned motor.

[0007] To achieve the aforementioned first objective, the present invention provides a rotor lamination. The rotor lamination has a central shaft hole and a first air groove extending radially along the rotor lamination. The first air groove has a closed structure at one end near the outer periphery of the rotor lamination. The first air groove includes a first tangential magnet receiving portion arranged parallel to the corresponding first air groove. The rotor lamination also has a second air groove extending radially along the rotor lamination. The second air groove includes a second tangential magnet receiving portion arranged parallel to the corresponding second air groove. There are two or more first and second air grooves, distributed around the central shaft hole and alternately arranged along the circumference of the rotor lamination. An opening is provided at one end of the second air groove near the outer periphery of the rotor lamination, and the opening communicates with the second tangential magnet receiving portion. The length of the first tangential magnet receiving portion is L1, and the length of the second tangential magnet receiving portion is L2. L1 and L2 satisfy the following condition: 0.91 ≤ L1 / L2 ≤ 1.

[0008] As can be seen from the above scheme, by setting tangential magnet housings of unequal lengths, and ensuring that 0.91≤L1 / L2≤1, the air gap magnetic flux density can be optimized, increasing magnetic flux and power density, reducing motor harmonic content, lowering noise, and improving motor operating efficiency. When L1 / L2 is less than 0.91, motor efficiency decreases, disrupting the original magnetic field distribution and increasing air gap magnetic field non-uniformity, which in turn leads to torque pulsation and operational instability. Simultaneously, experimental verification shows that with the above design, the back EMF approaches a sine wave, harmonic content is low, and motor efficiency is improved. Furthermore, this design enhances the rotor's mechanical strength, improving the motor's reliability and stability during high-speed rotation. In addition, this structural design can form a strong tangential component within the rotor core, making the magnetic flux path more concentrated and effectively increasing the air gap magnetic flux, thereby improving the motor's magnetic flux and power density. The tangential magnet design makes the air gap magnetic field more uniformly distributed in the circumferential direction, reducing air gap magnetic field non-uniformity, thus lowering torque pulsation and improving motor operating balance.

[0009] A preferred embodiment is that the width of the first air slot is equal to the width of the second air slot.

[0010] Therefore, if the widths of the two air slots are not equal, it will increase the production cost of the motor on the one hand, and cause uneven magnetic flux path on the other hand, resulting in changes in magnetic resistance and magnetic flux density, which in turn will affect the motor performance and reduce the motor efficiency.

[0011] A further option is that the width of both the first air slot and the second air slot is within the range of 1.68 mm to 1.72 mm.

[0012] Therefore, by limiting the width of the air slot, the magnetic flux density can be increased, the cogging torque can be optimized, the air magnetic flux distribution can be made more uniform, and the back EMF sine wave can reduce iron loss, thereby improving the motor efficiency.

[0013] A preferred option is that the width of the opening is in the range of 0.95 mm to 1.05 mm.

[0014] A preferred embodiment is that the end wall of the first air groove near the central shaft hole is provided with a first limiting boss, and the first limiting boss forms a first air groove air gap with the two side walls in the width direction of the first air groove; and / or the end wall of the second air groove near the central shaft hole is provided with a second limiting boss, and the second limiting boss forms a second air groove air gap with the two side walls in the width direction of the second air groove.

[0015] A further option is that the thickness of the first limiting boss and the second limiting boss is in the range of 0.45 mm to 0.5 mm.

[0016] Therefore, by setting the limiting boss, the magnet is prevented from shifting in the air slot, avoiding positional deviation during motor operation, ensuring that the magnet and rotor core remain in close contact, and improving the balance and stability of motor operation.

[0017] A preferred embodiment is that the rotor lamination is further provided with a plurality of magnetic isolation slots, the number of which is equal to the sum of the number of the first air slots and the number of the second air slots; the magnetic isolation slots are arranged close to and around the central shaft hole, and at least a portion of each magnetic isolation slot is located between adjacent first air slots and second air slots.

[0018] It can be seen that a magnetic bridge is formed between two adjacent magnetic isolation slots, and the setting of the magnetic bridge can increase the mechanical strength of the rotor.

[0019] A preferred embodiment is that the magnetic isolation slots are symmetrically arranged around the corresponding d-axis, and the magnetic isolation slots include a first slot segment, a second slot segment, and a third slot segment arranged sequentially along the corresponding d-axis; the first slot segment is closest to the central shaft hole, and the first slot segment is surrounded by a first arc-shaped wall, a second arc-shaped wall, and a third arc-shaped wall connected in sequence. The first arc-shaped wall and the third arc-shaped wall are arranged opposite each other along the circumference of the rotor lamination and are both bent in a direction away from each other, while the second arc-shaped wall is bent in a direction away from the central shaft hole; the second slot segment is surrounded by a first inclined wall and a second inclined wall, with the first inclined wall connected to the first arc-shaped wall and the second inclined wall connected to the third arc-shaped wall, and both the first and second inclined walls are inclined in a direction away from the central shaft hole; the third slot segment is surrounded by a third inclined wall, a fourth arc-shaped wall, and a fourth inclined wall connected in sequence, with the third inclined wall connected to the first inclined wall and the fourth inclined wall connected to the second inclined wall, both the third and fourth inclined walls being inclined towards the central shaft hole, and the fourth arc-shaped wall being bent in a direction away from the central shaft hole.

[0020] It can be seen that by designing the magnetic isolation groove in the shape of a gourd, the bottom of the rotor inner diameter magnet is hollowed out to the maximum extent, that is, the part of the rotor lamination near the central shaft hole, thereby reducing magnetic leakage of the magnet and preventing the magnetic circuit at the bottom of the rotor inner diameter magnet from circulating in place during the operation of the motor, and the magnetic circuit cannot enter the stator.

[0021] A further embodiment is that the included angle between the first inclined wall and the second inclined wall is in the range of 35.9° to 36.1°; and / or the first inclined wall and the second inclined wall are respectively parallel to the air slot closest to the inclined wall; and / or the minimum distance between two adjacent magnetic isolation slots is in the range of 0.5 mm to 1 mm.

[0022] A preferred embodiment is that two first magnetic flux tidying grooves are provided at one end of the first air groove near the outer periphery of the rotor lamination, and the two first magnetic flux tidying grooves are symmetrically arranged on both sides of the first air groove with the central axis of the corresponding first air groove as the center; and / or two second magnetic flux tidying grooves are provided at one end of the second air groove near the outer periphery of the rotor lamination, and the two second magnetic flux tidying grooves are symmetrically arranged on both sides of the second air groove with the central axis of the corresponding second air groove as the center.

[0023] A further embodiment is that the included angle between the two first magnetic flux sorting slots corresponding to each first air slot is in the range of 60° to 65°; and / or the included angle between the two second magnetic flux sorting slots corresponding to each second air slot is in the range of 45° to 50°.

[0024] It is evident that this design significantly reduces leakage flux in the rotor's outer and inner diameters, improves motor utilization, minimizes cogging torque and torque pulsation, thereby enhancing motor efficiency.

[0025] A preferred embodiment is that a first slit groove is formed on the outer periphery of the rotor lamination, the number of the first slit grooves being equal to the number of the first air slots, and one first slit groove and one first air slot being correspondingly arranged along the extension direction of the first air slot; and / or a second slit groove is formed on the outer periphery of the rotor lamination, one second air slot and two second slit grooves being correspondingly arranged, and the two second slit grooves being symmetrically arranged on both sides of the corresponding second air slot with the central axis of the second air slot as the center.

[0026] A further option is that the depth of the first cutting groove is in the range of 1 mm to 1.2 mm; and / or the depth of the second cutting groove is in the range of 0.5 mm to 1 mm.

[0027] Therefore, this design can effectively increase the magnetic flux density in the air gap of the motor, thereby improving the motor efficiency and optimizing electromagnetic noise.

[0028] To achieve the second objective mentioned above, the present invention provides a rotor core comprising a plurality of rotor laminations stacked together.

[0029] To achieve the third objective mentioned above, the present invention provides an electric motor including the rotor core described above.

[0030] To achieve the fourth objective mentioned above, the present invention provides a compressor having the aforementioned motor.

[0031] To achieve the fifth objective described above, the present invention provides a transportation vehicle having the aforementioned compressor. Attached Figure Description

[0032] Figure 1This is a structural diagram of an embodiment of the motor of the present invention.

[0033] Figure 2 This is a structural diagram of the rotor laminations and permanent magnets in an embodiment of the motor of the present invention.

[0034] Figure 3 This is a partial enlarged view of the first region near the air slot in the rotor lamination of the motor embodiment of the present invention.

[0035] Figure 4 This is a partially enlarged view of the second region near the air slot in the rotor lamination of the motor embodiment of the present invention.

[0036] Figure 5 This is a schematic diagram of the rotor laminations in an existing electric motor.

[0037] Figure 6 This is a waveform diagram of the back EMF of an existing motor.

[0038] Figure 7 This is a back EMF waveform diagram of an embodiment of the motor of the present invention.

[0039] Figure 8 This is a diagram showing the harmonic content of existing motors.

[0040] Figure 9 This is a diagram showing the harmonic content of an embodiment of the motor of the present invention.

[0041] Figure 10 This is a comparison chart of the motor efficiency of existing motors and the motor embodiment of the present invention.

[0042] Figure 11 This is a graph showing the relationship between the values ​​of L1 / L2 and the motor efficiency in an embodiment of the present invention.

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0044] Various exemplary embodiments of the invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the invention or its application or use. The invention can be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0045] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, without excluding the possibility of encompassing other elements. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] In this invention, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0047] All terms used in this invention (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0048] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0049] The transportation vehicle in this embodiment is a new energy vehicle. The new energy vehicle includes a compressor, which includes a compressor housing and a motor located inside the compressor housing. In this embodiment, the motor is a permanent magnet synchronous motor.

[0050] See Figure 1 and Figure 2 The permanent magnet synchronous motor includes a motor rotor, a motor stator, and a rotating shaft. The motor rotor includes a rotor core 1, and the motor stator includes a stator core 2 and a winding 3. The winding 3 is disposed in the stator slot 21 of the stator core 2. The motor stator is fixed in the compressor housing by a heat-shrink fitting, and the rotating shaft is interference-fitted with the central shaft hole 11 of the rotor core 1.

[0051] The rotor core 1 is made of a plurality of rotor laminations 10 stacked together along the axial direction of the rotor core 1. The rotor laminations 10 are provided with a central shaft hole 11 and a first air groove 12 extending radially along the rotor laminations 10. The first air groove 12 is closed at one end near the outer periphery of the rotor laminations 10. The first air groove 12 includes a first tangential magnet receiving portion 121 arranged parallel to the corresponding first air groove 12.

[0052] The rotor lamination 10 is also provided with a second air groove 13 extending radially along the rotor lamination 10. The number of the first air groove 12 and the second air groove 13 are both more than two. In this embodiment, the number of the first air groove 12 and the second air groove 13 are both five. Each first air groove 12 and the second air groove 13 are distributed around the central shaft hole 11 and are arranged alternately along the circumference of the rotor lamination 10.

[0053] See Figures 2 to 4 The second air slot 13 includes a second tangential magnet receiving portion 131 arranged parallel to the corresponding second air slot 13. Both the first tangential magnet receiving portion 121 and the second tangential magnet receiving portion 131 are used to accommodate permanent magnets 4 magnetized along the tangential direction of the rotor lamination 10. The length of the first tangential magnet receiving portion 121 is L1, and the length of the second tangential magnet receiving portion 131 is L2. L1 and L2 satisfy the following condition: 0.91 ≤ L1 / L2 ≤ 1. The width d1 of the first air slot 12 is equal to the width d2 of the second air slot 13, that is, the width of the first tangential magnet receiving portion 121 and the width of the second tangential magnet receiving portion 131 are equal. Furthermore, the widths d1 of the first air slot 12 and d2 of the second air slot 13 are both within the range of 1.68 mm to 1.72 mm. If the widths of the two air slots are unequal, it will increase the production cost of the motor and cause uneven magnetic flux paths, resulting in changes in magnetic reluctance and magnetic flux density, which in turn will affect motor performance and reduce motor efficiency. By limiting the width of the air slots, the magnetic flux density can be increased, the cogging torque optimized, the air flux distribution more uniform, and the back EMF sine wave reduced iron losses, thereby improving motor efficiency.

[0054] The second air groove 13 has an opening 130 at one end near the outer periphery of the rotor lamination 10, and the opening 130 communicates with the second tangential magnet receiving portion 131. The width d3 of the opening 130 is in the range of 0.95 mm to 1.05 mm. The width of the opening 130 is smaller than the width of the second air groove 13, so that the second tangential magnet receiving portion 131 forms a limiting step 135 near the opening 130 to radially limit the permanent magnet 4.

[0055] A first limiting boss 122 is provided on the end wall of the first air groove 12 near the central shaft hole 11. A first air groove air gap 123 is formed between the first limiting boss 122 and the two side walls of the first air groove 12 in the width direction. A second limiting boss 132 is provided on the end wall of the second air groove 13 near the central shaft hole 11. A second air groove air gap 133 is formed between the second limiting boss 132 and the two side walls of the second air groove 13 in the width direction. The thickness d4 of the first limiting boss 122 and the second limiting boss 132 is equal and both are within the range of 0.45 mm to 0.5 mm. The limiting bosses prevent the magnet from shifting within the air groove, avoiding positional deviation of the motor during operation, ensuring a tight fit between the magnet and the rotor core 1, and improving the balance and stability of the motor operation.

[0056] The rotor lamination 10 is also provided with a plurality of magnetic isolation slots 14, and a magnetic isolation bridge 15 is formed between two adjacent magnetic isolation slots 14. The number of magnetic isolation slots 14 is equal to the sum of the number of first air slots 12 and the number of second air slots 13. The magnetic isolation slots 14 are arranged close to and around the central shaft hole 11, and at least a portion of each magnetic isolation slot 14 is located between adjacent first air slots 12 and second air slots 13.

[0057] The magnetic isolation groove 14 is symmetrically arranged around the corresponding d-axis. The magnetic isolation groove 14 includes a first groove segment 141, a second groove segment 142, and a third groove segment 143 arranged sequentially along the corresponding d-axis. The first groove segment 141 is closest to the central shaft hole 11. The first groove segment 141 is surrounded by a first arc-shaped wall 1411, a second arc-shaped wall 1412, and a third arc-shaped wall 1413 connected sequentially. The first arc-shaped wall 1411 and the third arc-shaped wall 1413 are arranged opposite each other along the circumference of the rotor lamination 10 and are both bent in a direction away from each other. The second arc-shaped wall 1412 is bent in a direction away from the central shaft hole 11. The second groove segment 142 is surrounded by a first inclined wall 1421 and a second inclined wall 1422. The first inclined wall 1421 is connected to the first arc-shaped wall 1411, and the second inclined wall 1422 is connected to the third arc-shaped wall 1413. The first inclined wall 1421 and the second inclined wall 1422 are both inclined in a direction away from the central shaft hole 11. The third slot section 143 is formed by a third inclined wall 1431, a fourth arc-shaped wall 1432, and a fourth inclined wall 1433 connected in sequence. The third inclined wall 1431 is connected to the first inclined wall 1421, and the fourth inclined wall 1433 is connected to the second inclined wall 1422. Both the third inclined wall 1431 and the fourth inclined wall 1433 are inclined towards the central shaft hole 11, while the fourth arc-shaped wall 1432 is bent away from the central shaft hole 11. By designing the magnetic isolation slot 14 in a gourd shape, the bottom of the rotor inner diameter magnet is hollowed out to the maximum extent, that is, the part of the rotor lamination 10 near the central shaft hole 11, thereby reducing magnetic leakage of the magnet and preventing the magnetic circuit at the bottom of the rotor inner diameter magnet from circulating in place during motor operation, thus preventing the magnetic circuit from entering the stator.

[0058] The included angle ∅3 between the first inclined wall 1421 and the second inclined wall 1422 is in the range of 35.9° to 36.1°. The first inclined wall 1421 and the second inclined wall 1422 are respectively parallel to the air slots closest to the inclined walls. The minimum distance d5 between two adjacent magnetic isolation slots 14 is in the range of 0.5 mm to 1 mm, that is, the minimum width of the magnetic isolation bridge 15 is in the range of 0.5 mm to 1 mm. In this embodiment, one end of the air slot is provided with a limiting protrusion, which is opposite to the first inclined wall 1421 and the second inclined wall 1422 in the circumferential direction of the rotor lamination 10.

[0059] Two first magnetic flux tidying grooves 16 are correspondingly provided at one end of the first air groove 12 near the outer periphery of the rotor lamination 10. The two first magnetic flux tidying grooves 16 are symmetrically arranged on both sides of the corresponding first air groove 12 with the central axis as the center. Two second magnetic flux tidying grooves 17 are correspondingly provided at one end of the second air groove 13 near the outer periphery of the rotor lamination 10. The two second magnetic flux tidying grooves 17 are symmetrically arranged on both sides of the corresponding second air groove 13 with the central axis as the center. Preferably, along the radial direction, the length of the first magnetic flux tidying groove 16 is less than the length of the second magnetic flux tidying groove 17.

[0060] The included angle ∅1 between the two first magnetic flux accumulator slots 16 corresponding to each first air slot 12 is in the range of 60° to 65°, and the included angle ∅2 between the two second magnetic flux accumulator slots 17 corresponding to each second air slot 13 is in the range of 45° to 50°. The included angle refers to the angle between the two closest sidewalls of the corresponding magnetic flux accumulator slot. This design significantly reduces the leakage flux of the rotor's outer and inner diameters, improves the utilization rate of the motor, minimizes the motor's cogging torque and torque pulsation, and thus improves the motor's efficiency.

[0061] The outer periphery of the rotor lamination 10 is provided with a first shaving groove 18 and a second shaving groove 19. The number of first shaving grooves 18 is equal to the number of first air slots 12, and one first shaving groove 18 is correspondingly arranged with one first air slot 12 along the extending direction of the first air slot 12. One second air slot 13 is correspondingly arranged with two second shaving grooves 19, and the two second shaving grooves 19 are symmetrically arranged on both sides of the corresponding second air slot 13 with the central axis of the second air slot 13 as the center. The depth h1 of the first shaving groove 18 is in the range of 1 mm to 1.2 mm, and the depth h2 of the second shaving groove 19 is in the range of 0.5 mm to 1 mm. This design can effectively increase the magnetic flux density in the air gap of the motor, thereby improving the motor efficiency and optimizing electromagnetic noise.

[0062] Figure 5This is a schematic diagram of the structure of a rotor lamination 101 of an existing motor. The rotor lamination 101 has multiple magnetic slots 102 extending radially along the rotor lamination 101 and arranged circumferentially along the rotor lamination. Each magnetic slot 102 has the same size and is used to place a permanent magnet that is magnetized along the tangential direction of the rotor lamination 101. The rotor lamination 101 also has a central shaft hole 103 and multiple magnetic isolation slots 104. Each magnetic isolation slot 104 extends circumferentially along the rotor lamination and is arranged at intervals along the circumferential direction of the rotor lamination. In the radial direction of the rotor lamination 101, the magnetic isolation slots 104 are located between the central shaft hole 103 and the magnetic slots 102.

[0063] Figures 6 to 10 The figures show a comparison of the back EMF waveform, harmonic content, and motor efficiency of existing motors and the motor of this invention. As can be seen from the figures, under the same current, the output tangential force of the motors is the same. The iron loss of the motor of this invention at all frequencies is lower than that of existing motors. This results in higher magnetic flux and power density for the motor of this invention compared to existing motors. This invention can enhance the air gap magnetic field, increase power density, expand the constant power operating range, and improve motor efficiency. Figure 11 The graph shows the relationship between the value of L1 / L2 and the motor efficiency. As can be seen from the graph, when 0.91≤L1 / L2≤1, the motor operating efficiency can be maximized. When L1 / L2 is less than 0.91, the motor efficiency will decrease.

[0064] As can be seen from the above, by setting tangential magnet housings of unequal lengths, and ensuring that 0.91≤L1 / L2≤1, the air gap magnetic flux density can be optimized, increasing magnetic flux and power density, reducing motor harmonic content, lowering noise, and improving motor operating efficiency. When L1 / L2 is less than 0.91, motor efficiency decreases, disrupting the original magnetic field distribution and increasing air gap magnetic field non-uniformity, which in turn leads to torque pulsation and operational instability. Simultaneously, experimental verification shows that with the above design, the back EMF approaches a sine wave, harmonic content is low, and motor efficiency is improved. Furthermore, this design enhances the rotor's mechanical strength, improving the motor's reliability and stability during high-speed rotation. In addition, this structural design can form a strong tangential component within the rotor core, making the magnetic flux path more concentrated and effectively increasing the air gap magnetic flux, thereby improving the motor's magnetic flux and power density. The tangential magnet design makes the air gap magnetic field more uniformly distributed in the circumferential direction, reducing air gap magnetic field non-uniformity, thus lowering torque pulsation and improving motor operating balance.

[0065] Finally, it should be emphasized that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rotor lamination, wherein a central shaft hole and a first air groove extending radially along the rotor lamination are provided on the rotor lamination, the first air groove having a closed structure at one end near the outer periphery of the rotor lamination, and the first air groove including a first tangential magnet receiving portion arranged parallel to the corresponding first air groove; Its features are: The rotor lamination is also provided with a second air groove extending radially along the rotor lamination. The second air groove includes a second tangential magnet receiving portion arranged parallel to the corresponding second air groove. The number of the first air slot and the second air slot is two or more. The first air slot and the second air slot are distributed around the central shaft hole and are arranged alternately along the circumference of the rotor lamination. The second air slot has an opening at one end near the outer periphery of the rotor lamination, and the opening communicates with the second tangential magnet receiving portion; The length of the first tangential magnet receiving part is L1, and the length of the second tangential magnet receiving part is L2. The following condition is satisfied between L1 and L2: 0.91≤L1 / L2≤1.

2. The rotor lamination according to claim 1, characterized in that: The width of the first air slot is equal to the width of the second air slot.

3. The rotor lamination according to claim 2, characterized in that: The width of both the first air slot and the second air slot is in the range of 1.68 mm to 1.72 mm.

4. The rotor lamination according to any one of claims 1 to 3, characterized in that: The width of the opening is in the range of 0.95 mm to 1.05 mm.

5. The rotor lamination according to any one of claims 1 to 3, characterized in that: A first limiting boss is provided on the end wall of the first air groove near the central shaft hole, and a first air groove air gap is formed between the first limiting boss and the two side walls of the first air groove in the width direction; and / or A second limiting boss is provided on the end wall of the second air groove near the central shaft hole, and a second air groove air gap is formed between the second limiting boss and the two side walls in the width direction of the second air groove.

6. The rotor lamination according to claim 5, characterized in that: The thickness of the first limiting boss and the second limiting boss is in the range of 0.45 mm to 0.5 mm.

7. The rotor lamination according to any one of claims 1 to 3, characterized in that: The rotor lamination is also provided with a plurality of magnetic isolation slots, the number of which is equal to the sum of the number of the first air slots and the number of the second air slots; The magnetic shielding grooves are arranged close to and around the central shaft hole, and at least a portion of each magnetic shielding groove is located between adjacent first air grooves and second air grooves.

8. The rotor lamination according to claim 7, characterized in that: The magnetic shielding groove is symmetrically arranged with the corresponding d-axis as the center, and the magnetic shielding groove includes a first groove segment, a second groove segment and a third groove segment arranged sequentially along the corresponding d-axis; The first slot segment is closest to the central shaft hole. The first slot segment is surrounded by a first arc-shaped wall, a second arc-shaped wall and a third arc-shaped wall connected in sequence. The first arc-shaped wall and the third arc-shaped wall are arranged opposite each other along the circumference of the rotor lamination and are both bent in a direction away from each other. The second arc-shaped wall is bent in a direction away from the central shaft hole. The second groove segment is formed by a first inclined wall and a second inclined wall. The first inclined wall is connected to the first arc-shaped wall, and the second inclined wall is connected to the third arc-shaped wall. Both the first inclined wall and the second inclined wall are inclined in a direction away from the central shaft hole. The third groove segment is formed by a third inclined wall, a fourth arc-shaped wall and a fourth inclined wall connected in sequence. The third inclined wall is connected to the first inclined wall, and the fourth inclined wall is connected to the second inclined wall. Both the third and fourth inclined walls are inclined toward the central shaft hole, and the fourth arc-shaped wall is bent away from the central shaft hole.

9. The rotor lamination according to claim 8, characterized in that: The included angle between the first inclined wall and the second inclined wall is in the range of 35.9° to 36.1°; and / or The first inclined wall and the second inclined wall are respectively parallel to the air slots closest to the inclined walls; and / or The minimum distance between two adjacent magnetic isolation slots is in the range of 0.5 mm to 1 mm.

10. The rotor lamination according to any one of claims 1 to 3, characterized in that: Two first magnetic flux tidying grooves are correspondingly provided at one end of the first air groove near the outer periphery of the rotor lamination. The two first magnetic flux tidying grooves are symmetrically arranged on both sides of the first air groove with the central axis of the corresponding first air groove as the center; and / or Two second magnetic flux tidying grooves are provided at one end of the second air groove near the outer periphery of the rotor lamination. The two second magnetic flux tidying grooves are symmetrically arranged on both sides of the second air groove with the central axis of the corresponding second air groove as the center.

11. The rotor lamination according to claim 10, characterized in that: The included angle between the two first magnetic flux sorting slots corresponding to each of the first air slots is in the range of 60° to 65°; and / or The included angle between the two second magnetic flux sorting slots corresponding to each second air slot is in the range of 45° to 50°.

12. The rotor lamination according to any one of claims 1 to 3, characterized in that: The outer periphery of the rotor lamination is provided with a first slit groove, the number of which is equal to the number of the first air slots, and one first slit groove and one first air slot are correspondingly arranged along the extending direction of the first air slot; and / or The outer periphery of the rotor lamination is provided with a second cutting edge groove, and one second air groove is provided corresponding to two second cutting edge grooves. The two second cutting edge grooves are symmetrically arranged on both sides of the corresponding second air groove with the central axis of the second air groove as the center.

13. The rotor lamination according to claim 12, characterized in that: The depth of the first kerfed groove is in the range of 1 mm to 1.2 mm; and / or The depth of the second kerfed groove is in the range of 0.5 mm to 1 mm.

14. A rotor core, characterized in that, It includes multiple rotor laminations as described in any one of claims 1 to 13, stacked together.

15. An electric motor, characterized in that, Includes the rotor core as described in claim 14.

16. A compressor, characterized in that, Including the motor as described in claim 15.

17. A means of transport, characterized in that, Includes the compressor as described in claim 16.

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