Motor, compressor and vehicle

Abstract

The utility model provides a motor, a compressor and a vehicle. The motor comprises: a stator core; the rotor iron core is rotatably arranged in the stator iron core, an air gap is enclosed between the outer peripheral wall of the rotor iron core and the inner peripheral wall of the stator iron core, and the minimum value of the air gap from the rotor iron core to the stator iron core is recorded as delta; the rotor core is provided with a shaft hole and a plurality of magnet grooves, and the part of the rotor core between the magnet grooves and the peripheral wall of the rotor core is provided with a magnetic adjusting structure; each magnet groove comprises two magnetic groove parts, in each magnet groove, an included angle alpha is formed by the end faces, facing the peripheral wall of the rotor core, of the two magnetic groove parts, and the width of the magnetic groove parts in the circumferential direction of the rotor core is marked as H; the magnetic adjusting structure comprises a plurality of magnetic adjusting grooves, the plurality of magnetic adjusting grooves are arranged at intervals along the circumferential direction of the rotor core, the width of the magnetic adjusting grooves in the circumferential direction of the rotor core is recorded as d1, and the minimum distance from the magnet grooves to the outer circumferential wall of the rotor core is recorded as d2; wherein 0.25 * delta / d2 < d1 / H < alpha / 180 degrees.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more specifically, to a motor, a compressor, and a vehicle. Background Technology

[0002] New energy vehicles include electric compressors, which include permanent magnet motors. The operation of electric compressors can meet the driver's needs for adjusting the temperature inside the vehicle.

[0003] In related technologies, improper setting of permanent magnet motors can lead to prominent vibration and noise problems. If left unaddressed, this can worsen the noise performance of the electric compressor, making it easier for the driver to perceive vibration and noise inside the vehicle, thus severely affecting driving comfort. Utility Model Content

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

[0005] Therefore, the first aspect of this application proposes an electric motor.

[0006] The second aspect of this application proposes a compressor.

[0007] The third aspect of this application proposes a vehicle.

[0008] In view of the above, the first aspect of this application proposes an electric motor, comprising: a stator core; a rotor core rotatably disposed within the stator core, wherein an air gap is formed between the outer peripheral wall of the rotor core and the inner peripheral wall of the stator core, and the minimum value of the air gap along the rotor core to the stator core is denoted as δ; the rotor core is provided with a shaft hole and a plurality of magnet slots, the plurality of magnet slots being arranged at intervals around the shaft hole, and a magnet adjusting structure being provided in the portion of the rotor core located between the magnet slots and the outer peripheral wall of the rotor core; the magnet slots include two magnet portions, each magnet portion including an inner end near the shaft hole and an outer end far from the shaft hole. The outer end of the shaft hole and the inner ends of the two magnetic slots are connected to each other, while the outer ends of the two magnetic slots are far apart from each other. In the magnet slot, the end faces of the two magnetic slots facing the outer peripheral wall of the rotor core form an included angle α. The width of the magnetic slot in the circumferential direction of the rotor core is denoted as H. The magnetic adjustment structure includes multiple magnetic adjustment slots, which are arranged at intervals along the circumferential direction of the rotor core. The width of the magnetic adjustment slot in the circumferential direction of the rotor core is denoted as d1, and the minimum distance from the magnet slot to the outer peripheral wall of the rotor core is denoted as d2. Wherein, 0.25×δ / d2<d1 / H<α / 180°.

[0009] This application provides an electric motor comprising a stator core and a rotor core. The stator core and rotor core are coaxially arranged. The rotor core is rotatably disposed within the stator core, that is, the rotor core can rotate relative to the stator core.

[0010] The outer peripheral wall of the rotor core and the inner peripheral wall of the stator core are arranged at intervals. Specifically, an air gap is formed between the outer peripheral wall of the rotor core and the inner peripheral wall of the stator core.

[0011] The rotor core has a shaft hole and multiple magnet slots, which are arranged at intervals around the shaft hole. The rotor core also has multiple magnetic adjustment structures. Optionally, a magnetic adjustment structure is provided between any one of the magnet slots and the outer peripheral wall of the rotor core; that is, a magnetic adjustment structure is provided between each magnet slot and the outer peripheral wall of the rotor core. Optionally, a portion of the magnet slots have magnetic adjustment structures between them and the outer peripheral wall of the rotor core; that is, only some magnet slots have magnetic adjustment structures between them and the outer peripheral wall of the rotor core.

[0012] Further define the mating structure of the stator core and rotor core.

[0013] The magnet slot includes two magnetic slot sections. Each of the two magnetic slot sections includes an inner end and an outer end, with the inner end of the magnetic slot section located close to the shaft hole and the outer end of the magnetic slot section located away from the shaft hole. Furthermore, in the magnet slot, the inner ends of the two magnetic slot sections are connected to each other, while the outer ends of the two magnetic slot sections are located away from each other. That is, the two magnetic slot sections in the magnet slot are arranged in a "V" shape.

[0014] In the magnet slot, the end face of the slot facing the outer peripheral wall of the rotor core is designated as the reference plane. An angle α is formed between the two reference planes of two magnet slots.

[0015] An air gap is formed between the outer peripheral wall of the rotor core and the inner peripheral wall of the stator core. The minimum value of the air gap in the direction from the rotor core to the stator core is denoted as δ.

[0016] The width of the magnetic slot along the circumference of the rotor core is denoted as H.

[0017] The magnet adjustment structure includes multiple magnet adjustment slots arranged at intervals along the circumference of the rotor core. It can be understood that "multiple" refers to a quantity of two or more. The minimum distance from the magnet slot to the outer circumferential wall of the rotor core is denoted as d2.

[0018] The relationship between δ, d2, d1, H, and α is defined to satisfy 0.25×δ / d2<d1 / H<α / 180°. This setting can adjust the direction of the motor's magnetic field lines. Specifically, the direction of the magnetic field lines at the location of the magnetic adjustment structure changes, which can weaken the motor's back EMF harmonics and thus reduce the motor's back EMF distortion rate. This helps to reduce the motor's torque ripple and radial electromagnetic force, thereby helping to reduce the motor's vibration and noise.

[0019] It is understandable that the electromagnetic vibration noise level of an electric motor is related to the level of radial electromagnetic force and torque pulsation.

[0020] The radial electromagnetic force of a motor is an important indicator of its vibration and noise levels, and its magnitude varies with space and time. This application achieves a significant reduction in the radial electromagnetic force of the motor in terms of spatial order by ensuring that δ, d2, d1, H, and α satisfy 0.25×δ / d2<d1 / H<α / 180°, which is beneficial for improving the motor's vibration and noise. Simultaneously, under the same load conditions, it also reduces the peak-to-peak value of the motor's torque ripple, further reducing vibration and noise. Furthermore, this setting reduces the motor's back EMF distortion rate, giving the back EMF better sinusoidal characteristics and resulting in smoother output torque during motor operation under load. This weakens motor harmonics, thereby reducing vibration and noise.

[0021] The motor described above according to this application may also have the following additional technical features:

[0022] In some embodiments, optionally, d1 and H satisfy: 0.25 < d1 / H < 0.6.

[0023] In this embodiment, the structure of the motor is further defined.

[0024] Specifically, the width H of the magnetic slot in the circumferential direction of the rotor core and the width d1 of the magnetic adjustment slot in the circumferential direction of the rotor core satisfy 0.25 < d1 / H < 0.6.

[0025] This helps reduce motor torque ripple and weaken motor harmonics, thereby reducing motor vibration and noise, which in turn improves product performance and market competitiveness.

[0026] In some embodiments, α may optionally satisfy: 0.5 < α / 180° < 0.7.

[0027] In this embodiment, the structure of the motor is further defined.

[0028] Specifically, in the magnet slot, the end face of the slot facing the outer peripheral wall of the rotor core is designated as the reference plane. In the magnet slot, the included angle α formed between the two reference planes of the two slots satisfies 0.5 < α / 180° < 0.7.

[0029] This setting increases the air gap magnetic flux density amplitude of the motor, allowing for better utilization of permanent magnets and maximizing the motor's cost-effectiveness. Furthermore, it weakens the motor's back EMF harmonics and reduces its back EMF distortion rate, which helps reduce torque ripple and thus lowers vibration and noise.

[0030] Understandably, by limiting the range of values ​​for α, both the amount of permanent magnets used and the distance between the permanent magnets and the shaft hole can be taken into account. In this way, on the one hand, the material of the permanent magnets in the motor can be avoided, and the production cost of the motor can be guaranteed. On the other hand, the magnetic focusing ability of the motor can be guaranteed, and the torque output capability of the motor can be guaranteed.

[0031] In some embodiments, the distance from the magnet slot to the center of the shaft hole is denoted as d3, and the outer diameter of the rotor core is denoted as D, where 0.6 < d3 / D < 0.7.

[0032] In this embodiment, the structure of the rotor core is further defined such that the distance from the magnet slot to the center of the shaft hole is denoted as d3, and the outer diameter of the rotor core is denoted as D. The relationship between d3 and D is such that 0.6 < d3 / D < 0.7.

[0033] This arrangement places the magnet slots closer to the outer peripheral wall of the rotor core than the shaft hole. Therefore, the permanent magnets located within the magnet slots are also closer to the outer peripheral wall of the rotor core than the shaft hole. In other words, the permanent magnets are positioned closer to the outer peripheral wall of the rotor core. This helps reduce magnetic leakage losses from the permanent magnets, improves the motor's power density, and consequently enhances the motor's torque output.

[0034] In some embodiments, the minimum distance from the magnetizing structure to the outer peripheral wall of the rotor core is greater than or equal to 0.4 mm.

[0035] In this embodiment, the mating structure of the magnetizing structure and the rotor core is further defined, such that the distance between the magnetizing structure and the outer peripheral wall of the rotor core is denoted as k1, where the minimum value of k1 is greater than or equal to 0.4 mm. This setting ensures the manufacturability of the rotor core, keeps its strength within a safe range, avoids deformation during high-speed motor rotation, and prevents excessive vibration and noise caused by uneven magnetic field distribution due to excessive rotor core deformation. It also helps improve the structural strength of the rotor core.

[0036] In some embodiments, the minimum distance between the magnetizing structure and the magnet slot is greater than or equal to 0.4 mm.

[0037] In this embodiment, the matching structure of the magnetizing structure and the magnet slot is further defined, such that the distance between the magnetizing structure and the magnet slot is denoted as k2, where the minimum value of k2 is greater than or equal to 0.4 mm. This setting ensures the manufacturability of the rotor core, keeping its strength within a safe range and preventing deformation during high-speed motor rotation. This avoids the problem of excessive vibration and noise caused by uneven magnetic field distribution due to excessive rotor core deformation, and also helps to improve the structural strength of the rotor core.

[0038] In some embodiments, optionally, the magnetic adjustment structure includes at least: a first magnetic adjustment slot located on the magnetic pole center line of the rotor core; a plurality of second magnetic adjustment slots arranged at intervals on a first circumferential side of the first magnetic adjustment slot along the circumferential direction of the rotor core; and a plurality of third magnetic adjustment slots arranged at intervals on a second circumferential side of the first magnetic adjustment slot along the circumferential direction of the rotor core.

[0039] In this embodiment, the composition of the magnetic adjustment structure is further defined. Specifically, the magnetic adjustment structure includes a first magnetic adjustment slot, a plurality of second magnetic adjustment slots, and a plurality of third magnetic adjustment slots.

[0040] Along the circumference of the rotor core, the first magnetic adjustment slot has a first circumferential side and a second circumferential side disposed opposite to each other. A plurality of second magnetic adjustment slots are located on the first circumferential side of the first magnetic adjustment slot, and are spaced apart along the circumference of the rotor core. A plurality of third magnetic adjustment slots are located on the second circumferential side of the first magnetic adjustment slot, and are spaced apart along the circumferential direction of the rotor core.

[0041] Understandably, "multiple" refers to two or more.

[0042] The first magnetic adjustment slot, multiple second magnetic adjustment slots, and multiple third magnetic adjustment slots work together to adjust the direction of the motor's magnetic field lines, which can weaken the motor's back EMF harmonics and thus reduce the motor's back EMF distortion rate. This helps to reduce the motor's torque pulsation and radial electromagnetic force, thereby helping to reduce the motor's vibration and noise.

[0043] The first magnetic adjustment slot is located on the center line of the rotor core's magnetic poles. This allows for adjustment of the direction of the motor's magnetic field lines, regulating the magnetic field distribution, reducing leakage flux, and making the magnetic field distribution more symmetrical. This helps reduce the motor's high-frequency radial electromagnetic force and improves the motor's vibration and noise levels.

[0044] In addition, the first magnetic adjustment slot is located on the center line of the magnetic pole, which can determine the position of the first magnetic adjustment slot based on the center of the shaft hole and the center of the magnet slot, providing effective and reliable structural support for ensuring the controllable direction of the magnetic field lines.

[0045] In some embodiments, optionally, along the outer peripheral wall of the rotor core, the length of the first magnetic adjustment slot is denoted as l1, the length of the second magnetic adjustment slot is denoted as l2, and the length of the third magnetic adjustment slot is denoted as l3; wherein, l1≤l2, l1≤l3.

[0046] In this embodiment, the mating structure of the first magnetic adjustment slot, the second magnetic adjustment slot, and the third magnetic adjustment slot is further defined.

[0047] Let the length of the first magnetic adjustment slot be denoted as l1, the length of the second magnetic adjustment slot as l2, and the length of the third magnetic adjustment slot as l3, along the outer peripheral wall of the rotor core.

[0048] Where l1≤l2, l1≤l3.

[0049] In other words, the length of the first adjusting slot located on the center line of the magnetic pole is equal to the length of the second adjusting slot located on the first side of the center line of the magnetic pole. Alternatively, the length of the first adjusting slot located on the center line of the magnetic pole is shorter than the length of the second adjusting slot located on the first side of the center line of the magnetic pole.

[0050] The length of the first adjusting slot located on the center line of the magnetic pole is equal to the length of the third adjusting slot located on the second side of the center line of the magnetic pole. Alternatively, the length of the first adjusting slot located on the center line of the magnetic pole is shorter than the length of the third adjusting slot located on the second side of the center line of the magnetic pole.

[0051] The first, second, and third magnetic adjustment slots work together to adjust the direction of the motor's magnetic field lines, which helps reduce magnetic leakage, improve rotor strength, and enhance the reliability of the motor during high-speed operation.

[0052] It is understandable that the line connecting the center of the magnet slot and the center of the shaft hole on the axial end face of the rotor core is the magnetic pole center line, or simply the "d" axis.

[0053] In some embodiments, optionally, any two of the plurality of second magnetic adjustment slots are arranged in parallel, and each second magnetic adjustment slot and a third magnetic adjustment slot are arranged symmetrically about the magnetic pole centerline of the rotor core.

[0054] In this embodiment, the mating structure of the second and third magnetic adjustment slots is further defined.

[0055] Multiple second magnetic adjustment slots are arranged in parallel, that is, any two of the multiple second magnetic adjustment slots are arranged in parallel.

[0056] Each second adjusting slot and one third adjusting slot are arranged symmetrically about the center line of the rotor core's magnetic poles. That is, any one of the multiple second adjusting slots is paired with one third adjusting slot.

[0057] By setting up symmetrically arranged second and third magnetic adjustment slots to adjust the distribution of magnetic lines of force, the symmetry and sinusoidal nature of the motor's magnetic field arrangement can be improved, which helps to reduce magnetic leakage, thereby reducing torque pulsation during motor operation and improving vibration and noise during motor operation.

[0058] Meanwhile, this design ensures dynamic balance of the rotor during rotation, reduces the oscillation of the compressor's shaft structure, and effectively improves the content of harmonics in the motor's air gap magnetic flux density. This reduces stator iron losses, improving motor efficiency, and also reduces motor vibration and noise, thereby lowering the compressor's operating noise.

[0059] In some embodiments, the rotor core may optionally include a plurality of stacked rotor laminations, each rotor lamination having a rivet portion; the rivet portion is located between a first magnetic adjustment slot and a third magnetic adjustment slot adjacent to the first magnetic adjustment slot, and / or the rivet portion is located between the first magnetic adjustment slot and a second magnetic adjustment slot adjacent to the first magnetic adjustment slot.

[0060] In this embodiment, the structure of the rotor core is further defined such that the rotor core includes a plurality of rotor laminations, and the rotor laminations are provided with rivet portions.

[0061] Multiple rotor laminations are stacked along the axial direction of the rotor core to form the rotor core. The rivet parts on two adjacent rotor laminations can be matched to connect the multiple rotor laminations to each other in the axial direction, thereby forming the rotor core.

[0062] It is understood that the rivet part is located between the first magnetic adjustment slot and the third magnetic adjustment slot adjacent to the first magnetic adjustment slot, and / or between the first magnetic adjustment slot and the second magnetic adjustment slot adjacent to the first magnetic adjustment slot. That is, the rivet part is located on one side of the magnetic pole centerline and is adjacent to the first magnetic adjustment slot. If the rivet part is too close to the magnet slot, for example, if the rivet part is located between the magnet slot and the magnetic adjustment structure, then during the high-speed stamping process of the rotor lamination die, the magnet slot will deform, causing the size of the magnet slot to change, resulting in a mismatch between the size of the magnet slot and the size of the permanent magnet. This will affect the process of assembling the permanent magnet into the magnet slot. In other words, the positioning of the rivet part in this application can not only ensure the reliability of the rotor lamination riveting but also improve manufacturability, thus ensuring product production efficiency and yield.

[0063] In some embodiments, the number of rivet portions may be multiple, with at least one rivet portion provided at each magnetic adjustment structure.

[0064] In this embodiment, the number of rivet portions and the distribution position of the rivet portions are further defined.

[0065] Specifically, there are multiple rivet parts, with at least one rivet part provided at each magnetic adjustment structure.

[0066] For example, at least one rivet is provided between any of the first magnetic adjustment slots and the third magnetic adjustment slot located immediately adjacent to the first magnetic adjustment slot.

[0067] For example, at least one rivet is provided between any of the first magnetic adjustment slots and a second magnetic adjustment slot located adjacent to the first magnetic adjustment slot.

[0068] Multiple rivet parts are arranged at intervals around the shaft hole. This arrangement can ensure the balance and consistency of the force on the rotor laminations at different positions. In this way, the overall dimensions of the rotor core can be guaranteed, and the safety and reliability of the product can be improved.

[0069] In some embodiments, the motor may optionally include: a plurality of permanent magnets, at least one permanent magnet being disposed in a magnet slot, the permanent magnet containing X% cerium by mass, wherein 1% < X% < 5%.

[0070] In this embodiment, the structure of the motor is further defined such that the motor also includes multiple permanent magnets, with at least one permanent magnet disposed in each magnet slot. The permanent magnets contain X% cerium by mass. Using cerium-containing permanent magnets as magnetic poles reduces the content of praseodymium and neodymium elements in the permanent magnets, thereby reducing the production cost of the permanent magnets and consequently reducing the production cost of the motor. This solves the problem of high motor costs caused by the high price of rare earth materials such as praseodymium and neodymium in related technologies.

[0071] By replacing the relatively expensive praseodymium and neodymium elements in permanent magnets with cerium, which is abundant and relatively inexpensive, the price of permanent magnets can be effectively reduced, thus improving the cost-effectiveness of motors.

[0072] In addition, the mass percentage of cerium in permanent magnets is greater than 1% and less than 5%. Adding cerium to permanent magnets can reduce the cost of permanent magnets, thereby reducing the cost of motors. However, the addition of cerium will reduce the intrinsic coercivity of permanent magnets, thus weakening the motor's anti-demagnetization ability. When the mass percentage of cerium is greater than 1% and less than 5%, the motor's cost-effectiveness can be improved while meeting the requirements for motor anti-demagnetization ability.

[0073] The second aspect of this utility model provides a compressor, comprising: a motor as described in the first aspect.

[0074] The compressor provided by this utility model includes a motor as described in the first aspect, and therefore has all the beneficial effects of the aforementioned motor, which will not be described in detail here.

[0075] A third aspect of this utility model provides a vehicle comprising: an electric motor as described in the first aspect; or a compressor as described in the second aspect.

[0076] The vehicle provided by this utility model includes a motor as described in the first aspect, or a compressor as described in the second aspect, and therefore has all the beneficial effects of the aforementioned motor or compressor, which will not be described in detail here.

[0077] It is worth noting that the vehicle can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, and hydrogen engine vehicles.

[0078] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0079] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0080] Figure 1 A partial structural schematic diagram of a motor according to an embodiment of this application is shown;

[0081] Figure 2 A schematic diagram of the rotor core and permanent magnet of one embodiment of this application is shown;

[0082] Figure 3 A schematic diagram of the rotor lamination structure of one embodiment of this application is shown;

[0083] Figure 4 A partial structural schematic diagram of a rotor lamination according to an embodiment of this application is shown;

[0084] Figure 5 A diagram showing the distribution of magnetic field lines of an electric motor according to an embodiment of this application is provided.

[0085] Figure 6 A comparative data graph showing the radial electromagnetic force amplitude and spatial order of the motor in this application and related technologies is presented;

[0086] Figure 7 A comparative data graph showing the radial electromagnetic force amplitude and time frequency doubling of the motor in this application and related technologies is shown;

[0087] Figure 8 A comparative data graph showing the radial electromagnetic force amplitude and d1 / H of the motor in this application and related technologies is shown;

[0088] Figure 9 A comparative graph showing the output torque and α / 180° of the motor in this application and related technologies is presented;

[0089] Figure 10 A comparative graph of the output torque and d3 / D of the motor in this application and related technologies is shown.

[0090] in, Figures 1 to 5 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0091] 1. Motor, 10. Stator core, 20. Rotor core, 200. Shaft hole, 300. Magnet slot, 310. Magnet slot section, 312. Inner end, 314. Outer end, 400. Magnet adjustment structure, 410. Magnet adjustment slot, 410a. First magnet adjustment slot, 410b. Second magnet adjustment slot, 410c. Third magnet adjustment slot, 500. Rotor lamination, 600. Rivet section, 70. Air gap, 80. Permanent magnet, 90. Magnetic pole center line. Detailed Implementation

[0092] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0093] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0094] The following reference Figures 1 to 10 According to some embodiments of this application, there is an electric motor 1, a compressor, and a vehicle.

[0095] like Figure 1 , Figure 2 and Figure 3 As shown, an electric motor 1 according to some embodiments of this application includes a stator core 10 and a rotor core 20.

[0096] The rotor core 20 is rotatably disposed within the stator core 10.

[0097] An air gap 70 is formed between the outer peripheral wall of the rotor core 20 and the inner peripheral wall of the stator core 10.

[0098] The minimum value of the air gap 70 along the rotor core 20 to the stator core 10 is denoted as δ.

[0099] The rotor core 20 is provided with a shaft hole 200 and multiple magnet slots 300.

[0100] Multiple magnet slots 300 are arranged at intervals around the shaft hole 200.

[0101] The rotor core 20 is provided with a magnetic adjustment structure 400 in the part between the magnet slot 300 and the outer peripheral wall of the rotor core 20.

[0102] The magnet slot 300 includes two magnet slot sections 310.

[0103] The magnetic groove portion 310 includes an inner end 312 near the shaft hole 200 and an outer end 314 away from the shaft hole 200.

[0104] The inner ends 312 of the two magnetic slots 310 are connected to each other.

[0105] The outer ends 314 of the two magnetic slots 310 are far apart from each other.

[0106] In the magnet slot 300, the two magnet slot portions 310 form an included angle α with their end faces facing the outer peripheral wall of the rotor core 20.

[0107] The width of the magnetic slot 310 in the circumferential direction of the rotor core 20 is denoted as H.

[0108] The magnetic adjustment structure 400 includes multiple magnetic adjustment slots 410.

[0109] Multiple magnetic adjustment slots 410 are arranged at intervals along the circumference of the rotor core 20.

[0110] The width of the magnetic adjustment slot 410 in the circumferential direction of the rotor core 20 is denoted as d1.

[0111] The minimum distance from the magnet slot 300 to the outer peripheral wall of the rotor core 20 is denoted as d2.

[0112] Wherein, 0.25×δ / d2<d1 / H<α / 180°.

[0113] The electric motor 1 provided in this application includes a stator core 10 and a rotor core 20. The stator core 10 and the rotor core 20 are coaxially arranged. The rotor core 20 is rotatably disposed within the stator core 10, that is, the rotor core 20 can rotate relative to the stator core 10.

[0114] The outer peripheral wall of the rotor core 20 and the inner peripheral wall of the stator core 10 are arranged at intervals. Specifically, an air gap 70 is formed between the outer peripheral wall of the rotor core 20 and the inner peripheral wall of the stator core 10.

[0115] The rotor core 20 has a shaft hole 200 and multiple magnet slots 300, which are arranged at intervals around the shaft hole 200. The rotor core 20 also has multiple magnet adjustment structures 400. Optionally, a magnet adjustment structure 400 is provided between any one of the magnet slots 300 and the outer peripheral wall of the rotor core 20; that is, a magnet adjustment structure 400 is provided between each magnet slot 300 and the outer peripheral wall of the rotor core 20. Optionally, a portion of the magnet slots 300 are provided with a magnet adjustment structure 400 between them and the outer peripheral wall of the rotor core 20; that is, only a portion of the magnet slots 300 are provided with a magnet adjustment structure 400 between them and the outer peripheral wall of the rotor core 20.

[0116] The mating structure of the stator core 10 and the rotor core 20 is further defined.

[0117] The magnet slot 300 includes two magnetic slot portions 310. Each of the two magnetic slot portions 310 includes an inner end 312 and an outer end 314. The inner end 312 of the magnetic slot portion 310 is disposed near the shaft hole 200, and the outer end 314 of the magnetic slot portion 310 is disposed away from the shaft hole 200. Furthermore, in the magnet slot 300, the inner ends 312 of the two magnetic slot portions 310 are connected to each other, and the outer ends 314 of the two magnetic slot portions 310 are separated from each other. That is, the two magnetic slot portions 310 in the magnet slot 300 are arranged in a "V" shape.

[0118] In the magnet slot 300, the end face of the magnetic slot portion 310 facing the outer peripheral wall of the rotor core 20 is designated as the reference surface. In the magnet slot 300, an included angle α is formed between the two reference surfaces of the two magnetic slot portions 310.

[0119] An air gap 70 is formed between the outer peripheral wall of the rotor core 20 and the inner peripheral wall of the stator core 10. The minimum value of the air gap 70 in the direction from the rotor core 20 to the stator core 10 is denoted as δ.

[0120] The width of the magnetic slot 310 along the circumference of the rotor core 20 is denoted as H.

[0121] The magnet adjustment structure 400 includes multiple magnet adjustment slots 410, which are arranged at intervals along the circumference of the rotor core 20. It can be understood that "multiple" refers to a quantity of two or more. The minimum distance from the magnet slot 300 to the outer peripheral wall of the rotor core 20 is denoted as d2.

[0122] The relationship between δ, d2, d1, H, and α is defined to satisfy 0.25×δ / d2<d1 / H<α / 180°. This setting can adjust the direction of the magnetic field lines of motor 1. Specifically, the direction of the magnetic field lines at the position of the magnetic adjustment structure 400 changes, which can weaken the back EMF harmonics of motor 1, thereby reducing the back EMF distortion rate of motor 1. This is beneficial to reducing the torque pulsation and radial electromagnetic force of motor 1, thus helping to reduce the vibration and noise of motor 1.

[0123] It is understandable that the electromagnetic vibration noise level of motor 1 is related to the radial electromagnetic force level and torque pulsation.

[0124] The radial electromagnetic force of motor 1 is an important indicator of its vibration and noise level, and its magnitude varies with space and time. This application achieves this by ensuring that δ, d2, d1, H, and α satisfy 0.25×δ / d2<d1 / H<α / 180°, significantly reducing the radial electromagnetic force of motor 1 in terms of spatial order, which is beneficial for improving the vibration and noise of motor 1. Simultaneously, under the same load conditions, it also reduces the peak-to-peak torque ripple of motor 1, further reducing its vibration and noise. Furthermore, this setting also reduces the back EMF distortion rate of motor 1, giving it better sinusoidal characteristics. This results in a smoother output torque when motor 1 is under load, thus weakening harmonics and further reducing vibration and noise.

[0125] In some embodiments, optionally, d1 and H satisfy: 0.25 < d1 / H < 0.6.

[0126] In this embodiment, the structure of motor 1 is further defined.

[0127] Specifically, the width H of the magnetic slot 310 in the circumferential direction of the rotor core 20 and the width d1 of the magnetic adjustment slot 410 in the circumferential direction of the rotor core 20 satisfy 0.25 < d1 / H < 0.6.

[0128] This helps reduce the torque pulsation of motor 1 and weakens the harmonics of motor 1, thereby reducing the vibration and noise of motor 1 and improving the performance and market competitiveness of the product.

[0129] Alternatively, d1 / H = 0.3, d1 / H = 0.32, d1 / H = 0.35, d1 / H = 0.38, d1 / H = 0.4, d1 / H = 0.42, d1 / H = 0.45, d1 / H = 0.47, d1 / H = 0.5, d1 / H = 0.51, d1 / H = 0.55, d1 / H = 0.57, etc., which will not be listed here.

[0130] In some embodiments, α may optionally satisfy: 0.5 < α / 180° < 0.7.

[0131] In this embodiment, the structure of motor 1 is further defined.

[0132] Specifically, in the magnet slot 300, the end face of the magnetic slot portion 310 facing the outer peripheral wall of the rotor core 20 is designated as the reference surface. In the magnet slot 300, the included angle α formed between the two reference surfaces of the two magnetic slot portions 310 satisfies 0.5 < α / 180° < 0.7.

[0133] This setting can increase the magnetic flux density amplitude of the air gap 70 of motor 1, improve the amount of permanent magnet 80 used in motor 1, and maximize the cost-effectiveness of motor 1. Furthermore, this setting can weaken the back EMF harmonics of motor 1, reduce the back EMF distortion rate of motor 1, and help reduce the torque pulsation of motor 1, thereby reducing the vibration and noise of motor 1.

[0134] It is understandable that by limiting the range of values ​​for α, the amount of permanent magnet 80 used and the distance between permanent magnet 80 and shaft hole 200 can be balanced. In this way, on the one hand, the material of permanent magnet 80 of motor 1 can be avoided, and the production cost of motor 1 can be guaranteed. On the other hand, the magnetic focusing ability of motor 1 can be guaranteed, and the torque output capability of motor 1 can be guaranteed.

[0135] Alternatively, α / 180° = 0.52, α / 180° = 0.54, α / 180° = 0.55, α / 180° = 0.58, α / 180° = 0.6, α / 180° = 0.61, α / 180° = 0.64, α / 180° = 0.65, and α / 180° = 0.68, etc., which will not be listed here.

[0136] In some embodiments, optionally, such as Figure 1 and Figure 3 As shown, the distance from the center of the magnet slot 300 to the center of the shaft hole 200 is denoted as d3.

[0137] The outer diameter of the rotor core 20 is denoted as D.

[0138] Among them, 0.6 < d3 / D < 0.7.

[0139] In this embodiment, the structure of the rotor core 20 is further defined such that the distance from the center of the magnet slot 300 to the center of the shaft hole 200 is denoted as d3, and the outer diameter of the rotor core 20 is denoted as D. The relationship between d3 and D is such that 0.6 < d3 / D < 0.7.

[0140] This arrangement places the magnet slot 300 closer to the outer peripheral wall of the rotor core 20 than the shaft hole 200. Therefore, the permanent magnet 80 disposed within the magnet slot 300 is also closer to the outer peripheral wall of the rotor core 20 than the shaft hole 200. In other words, the permanent magnet 80 is positioned closer to the outer peripheral wall of the rotor core 20. This helps reduce the leakage flux loss of the permanent magnet 80, improves the power density of the motor 1, and consequently enhances the torque output of the motor 1.

[0141] Alternatively, d3 / D = 0.61, d3 / D = 0.62, d3 / D = 0.63, d3 / D = 0.64, d3 / D = 0.65, d3 / D = 0.66, d3 / D = 0.67, d3 / D = 0.68, and d3 / D = 0.69, etc., which will not be listed here.

[0142] In some embodiments, optionally, such as Figure 4 As shown, the minimum distance between the magnetic adjustment structure 400 and the outer peripheral wall of the rotor core 20 is greater than or equal to 0.4 mm.

[0143] In this embodiment, the mating structure of the magnetic adjustment structure 400 and the rotor core 20 is further defined, such that the distance between the magnetic adjustment structure 400 and the outer peripheral wall of the rotor core 20 is denoted as k1, where the minimum value of k1 is greater than or equal to 0.4 mm. This setting ensures the manufacturability of the rotor core 20, keeps the strength of the rotor core 20 within a safe range, avoids deformation when the motor 1 rotates at high speed, and thus avoids the problem of high vibration and noise caused by uneven magnetic field distribution of the motor 1 due to excessive deformation of the rotor core 20, and is conducive to improving the structural strength of the rotor core 20.

[0144] Alternatively, k1 = 0.5mm, k1 = 0.6mm, k1 = 0.7mm, k1 = 0.8mm, k1 = 0.9mm, and k1 = 1mm, etc., which will not be listed here.

[0145] In some embodiments, optionally, such as Figure 4 As shown, the minimum distance between the magnetizing structure 400 and the magnet slot 300 is greater than or equal to 0.4 mm.

[0146] In this embodiment, the mating structure of the magnetizing structure 400 and the magnet slot 300 is further defined, such that the distance between the magnetizing structure 400 and the magnet slot 300 is denoted as k2, where the minimum value of k2 is greater than or equal to 0.4 mm. This setting ensures the manufacturability of the rotor core 20, keeping its strength within a safe range and preventing deformation during high-speed rotation of the motor 1. This avoids the problem of excessive vibration and noise caused by uneven magnetic field distribution in the motor 1 due to excessive deformation of the rotor core 20, and also helps to improve the structural strength of the rotor core 20.

[0147] Alternatively, k2 = 0.5mm, k2 = 0.6mm, k2 = 0.7mm, k2 = 0.8mm, k2 = 0.9mm, and k2 = 1mm, etc., which will not be listed here.

[0148] In some embodiments, optionally, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the magnetic adjustment structure 400 includes a first magnetic adjustment slot 410a, a plurality of second magnetic adjustment slots 410b and a plurality of third magnetic adjustment slots 410c.

[0149] The first magnetic adjustment slot 410a is located on the magnetic pole center line 90 of the rotor core 20.

[0150] Along the circumference of the rotor core 20, a plurality of second magnetic adjustment slots 410b are arranged at intervals on the first side of the circumference of the first magnetic adjustment slot 410a.

[0151] Along the circumference of the rotor core 20, a plurality of third magnetic adjustment slots 410c are arranged at intervals on the second side of the circumference of the first magnetic adjustment slot 410a.

[0152] In this embodiment, the composition of the magnetic adjustment structure 400 is further defined. Specifically, the magnetic adjustment structure 400 includes a first magnetic adjustment slot 410a, a plurality of second magnetic adjustment slots 410b, and a plurality of third magnetic adjustment slots 410c.

[0153] Along the circumference of the rotor core 20, the first magnetic adjustment slot 410a has a first circumferential side and a second circumferential side disposed opposite to each other. A plurality of second magnetic adjustment slots 410b are located on the first circumferential side of the first magnetic adjustment slot 410a, and are spaced apart along the circumference of the rotor core 20. A plurality of third magnetic adjustment slots 410c are located on the second circumferential side of the first magnetic adjustment slot 410a, and are spaced apart along the circumferential direction of the rotor core 20.

[0154] Understandably, "multiple" refers to two or more.

[0155] The first magnetic adjustment slot 410a, multiple second magnetic adjustment slots 410b, and multiple third magnetic adjustment slots 410c work together to adjust the direction of the magnetic lines of force of the motor 1, which can weaken the back EMF harmonics of the motor 1 and thus reduce the back EMF distortion rate of the motor 1. This is beneficial to reducing the torque pulsation and radial electromagnetic force of the motor 1, thereby reducing the vibration and noise of the motor 1.

[0156] The first magnetic adjustment slot 410a is located on the magnetic pole center line 90 of the rotor core 20. This allows for adjustment of the magnetic field lines of the motor 1, regulating the magnetic field distribution, reducing leakage flux, and making the magnetic field distribution more symmetrical. This helps reduce the high-frequency radial electromagnetic force of the motor 1 and improves the vibration and noise of the motor 1.

[0157] In addition, the first magnetic adjustment groove 410a is located on the magnetic pole center line 90, and the position of the first magnetic adjustment groove 410a can be determined according to the center of the shaft hole 200 and the center of the magnet groove 300, which provides effective and reliable structural support for ensuring the controllable direction of the magnetic field lines.

[0158] In some embodiments, optionally, such as Figure 4 As shown, the length of the first magnetizing slot 410a along the outer peripheral wall of the magnet slot 300 to the rotor core 20 is denoted as l1.

[0159] The length of the second adjusting slot 410b is denoted as l2.

[0160] The length of the third adjusting slot 410c is denoted as l3.

[0161] Where l1≤l2, l1≤l3.

[0162] In this embodiment, the mating structure of the first magnetic adjustment groove 410a, the second magnetic adjustment groove 410b, and the third magnetic adjustment groove 410c is further defined.

[0163] The length of the first magnetic adjustment slot 410a along the outer peripheral wall of the magnet slot 300 to the rotor core 20 is denoted as l1, the length of the second magnetic adjustment slot 410b is denoted as l2, and the length of the third magnetic adjustment slot 410c is denoted as l3.

[0164] Where l1≤l2, l1≤l3.

[0165] That is, the length of the first magnetic adjustment slot 410a located on the magnetic pole centerline 90 is equal to the length of the second magnetic adjustment slot 410b located on the first side of the magnetic pole centerline 90. Alternatively, the length of the first magnetic adjustment slot 410a located on the magnetic pole centerline 90 is shorter than the length of the second magnetic adjustment slot 410b located on the first side of the magnetic pole centerline 90.

[0166] The length of the first magnetic adjustment slot 410a located on the magnetic pole centerline 90 is equal to the length of the third magnetic adjustment slot 410c located on the second side of the magnetic pole centerline 90. Alternatively, the length of the first magnetic adjustment slot 410a located on the magnetic pole centerline 90 is shorter than the length of the third magnetic adjustment slot 410c located on the second side of the magnetic pole centerline 90.

[0167] The first magnetic adjustment slot 410a, the second magnetic adjustment slot 410b, and the third magnetic adjustment slot 410c work together to adjust the direction of the magnetic lines of force of the motor 1, which helps to reduce magnetic leakage, improve the strength of the rotor, and improve the reliability of the motor 1 when it is running at high speed.

[0168] It is understandable that the line connecting the center of the magnet slot 300 and the center of the shaft hole 200 on the axial end face of the rotor core 20 is the magnetic pole center line 90, or simply the "d" axis.

[0169] In some embodiments, optionally, any two of the plurality of second magnetic adjustment slots 410b are arranged in parallel.

[0170] Each second magnetic adjustment slot 410b and a third magnetic adjustment slot 410c are arranged symmetrically about the magnetic pole center line 90 of the rotor core 20.

[0171] In this embodiment, the mating structure of the second magnetic adjustment slot 410b and the third magnetic adjustment slot 410c is further defined.

[0172] Multiple second magnetic adjustment slots 410b are arranged in parallel, that is, any two of the multiple second magnetic adjustment slots 410b are arranged in parallel.

[0173] Each second magnetic adjustment slot 410b and a third magnetic adjustment slot 410c are arranged symmetrically about the magnetic pole center line 90 of the rotor core 20. That is, any one of the multiple second magnetic adjustment slots 410b is paired with a third magnetic adjustment slot 410c.

[0174] By setting up a symmetrically arranged second magnetic adjustment slot 410b and a third magnetic adjustment slot 410c to adjust the distribution of magnetic lines of force, the symmetry and sinusoidal nature of the magnetic field arrangement of motor 1 are improved, which helps to reduce leakage flux, thereby reducing torque pulsation during the operation of motor 1 and improving vibration and noise during the operation of motor 1.

[0175] Meanwhile, this design ensures dynamic balance of the rotor during rotation, reduces the oscillation of the compressor's shaft structure, and effectively improves the content of harmonics in the air gap 70 magnetic flux density of motor 1. This reduces stator iron losses in motor 1, improving its operating efficiency, and also reduces vibration and noise, thereby lowering the compressor's operating noise.

[0176] In some embodiments, optionally, such as Figure 2 and Figure 3 As shown, the rotor core 20 includes a plurality of stacked rotor laminations 500.

[0177] The rotor lamination 500 is provided with a rivet part 600.

[0178] The rivet part 600 is located between the first magnetic adjustment groove 410a and the third magnetic adjustment groove 410c that is adjacent to the first magnetic adjustment groove 410a.

[0179] And / or the rivet part 600 is located between the first magnetic adjustment groove 410a and the second magnetic adjustment groove 410b disposed adjacent to the first magnetic adjustment groove 410a.

[0180] In this embodiment, the structure of the rotor core 20 is further defined such that the rotor core 20 includes a plurality of rotor laminations 500, and the rotor laminations 500 are provided with rivet portions 600.

[0181] Multiple rotor laminations 500 are stacked along the axial direction of the rotor core 20 to form the rotor core 20. The rivet portions 600 on two adjacent rotor laminations 500 can cooperate to connect the multiple rotor laminations 500 to each other in the axial direction, thereby forming the rotor core 20.

[0182] It is understandable that the rivet part 600 is located between the first magnetic adjustment groove 410a and the third magnetic adjustment groove 410c adjacent to the first magnetic adjustment groove 410a, and / or the rivet part 600 is located between the first magnetic adjustment groove 410a and the second magnetic adjustment groove 410b adjacent to the first magnetic adjustment groove 410a. That is, the rivet part 600 is located on one side of the magnetic pole center line 90, and the rivet part 600 is adjacent to the first magnetic adjustment groove 410a. If the rivet part 600 is too close to the magnet groove 300, for example, if the rivet part 600 is located between the magnet groove 300 and the magnetic adjustment structure 400, then during the high-speed stamping process of the rotor lamination 500 die, the magnet groove 300 will be deformed, causing the size of the magnet groove 300 to change, resulting in a mismatch between the size of the magnet groove 300 and the size of the permanent magnet 80. This will affect the process of assembling the permanent magnet 80 into the magnet groove 300. In other words, the positioning of the rivet part 600 in this application can not only ensure the reliability of the riveting of the rotor lamination 500, but also improve manufacturability, thereby ensuring the production efficiency and yield of the product.

[0183] In some embodiments, the number of rivet portions 600 may be multiple.

[0184] Each magnetizing structure 400 has at least one rivet part 600.

[0185] In this embodiment, the number of rivet portions 600 and the distribution position of the rivet portions 600 are further defined.

[0186] Specifically, there are multiple rivet parts 600, with at least one rivet part 600 provided at each magnetic adjustment structure 400.

[0187] For example, at least one rivet portion 600 is provided between any of the plurality of first magnetic adjustment slots 410a and a third magnetic adjustment slot 410c disposed adjacent to the first magnetic adjustment slot 410a.

[0188] For example, at least one rivet portion 600 is provided between any of the plurality of first magnetic adjustment slots 410a and a second magnetic adjustment slot 410b disposed adjacent to the first magnetic adjustment slot 410a.

[0189] Multiple rivet parts 600 are arranged at intervals around the shaft hole 200. This arrangement can ensure the balance and consistency of the force on the rotor lamination 500 at different positions. In this way, the overall dimensions of the rotor core 20 can be guaranteed, and the safety and reliability of the product can be improved.

[0190] In some embodiments, the motor 1 may optionally include: a plurality of permanent magnets 80, at least one permanent magnet 80 being disposed in the magnet slot 300, the permanent magnet 80 containing X% cerium by mass, wherein 1% < X% < 5%.

[0191] In this embodiment, the structure of the motor 1 is further defined such that the motor 1 also includes a plurality of permanent magnets 80, and at least one permanent magnet 80 is disposed in each magnet slot 300. The permanent magnets 80 contain X% cerium by mass. Using cerium-containing permanent magnets 80 as magnetic poles reduces the content of praseodymium and neodymium elements in the permanent magnets 80, thereby reducing the production cost of the permanent magnets 80 and consequently reducing the production cost of the motor 1. This solves the problem of high cost of the motor 1 due to the high price of rare earth materials such as praseodymium and neodymium in related technologies.

[0192] By replacing the relatively expensive praseodymium and neodymium elements in permanent magnet 80 with cerium, which is abundant and relatively inexpensive, the price of permanent magnet 80 can be effectively reduced, and the cost-effectiveness of motor 1 can be improved.

[0193] In addition, the mass percentage of cerium in the permanent magnet 80 is greater than 1% and less than 5%. Adding cerium to the permanent magnet 80 can reduce the cost of the permanent magnet 80, thereby reducing the cost of the motor 1. However, the addition of cerium will reduce the intrinsic coercivity of the permanent magnet 80, thereby weakening the motor 1's resistance to demagnetization. When the mass percentage of cerium is greater than 1% and less than 5%, the cost-effectiveness of the motor 1 can be improved while meeting the requirements for the motor 1's resistance to demagnetization.

[0194] A compressor according to some embodiments of this application includes: a motor 1 as described in any of the above embodiments.

[0195] The compressor provided by this utility model includes the motor 1 as described in any of the above embodiments, and therefore has all the beneficial effects of the motor 1, which will not be described in detail here.

[0196] A vehicle according to some embodiments of the present application includes: a motor 1 as in any of the above embodiments; or a compressor as in the above embodiments.

[0197] The vehicle provided by this utility model includes a motor 1 as described in any of the above embodiments, or a compressor as described in the above embodiments. Therefore, it has all the beneficial effects of the motor 1 or the compressor, which will not be described one by one here.

[0198] It is worth noting that the vehicle can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, and hydrogen engine vehicles.

[0199] Optionally, the motor 1 (e.g., a permanent magnet motor) includes a stator and a rotor. The stator includes a stator core 10, stator slots, and enameled wire. The rotor includes a rotor core 20 and permanent magnets 80. Enameled wire is placed in the stator slots and wound around the teeth of the stator core 10. The magnet slots 300 are evenly distributed along the circumference of the rotor core 20. The permanent magnets 80 are placed in the magnet slots 300 and contain cerium. The portion of the rotor core 20 between the outer peripheral wall of the rotor core 20 and the magnet slots 300 forms a magnetic pole portion, and the magnetic pole portion is provided with a magnetic adjustment structure 400. Each magnetic adjustment structure 400 includes 5 magnetic adjustment slots 410, and the motor 1 satisfies: 0.25×δ / d2<d1 / H<α / 180°, optionally, 0.25<d1 / H<0.6.

[0200] Wherein, d1 represents the width of the magnetic slot 410 in the circumferential direction of the rotor core 20, and H represents the width of the magnetic slot portion 310 in the circumferential direction of the rotor core 20. δ represents the minimum clearance between the stator and rotor of the motor 1, and α represents the included angle between the two magnetic slot portions 310 of the magnetic slot 300.

[0201] The magnetic adjustment structure 400 includes a first magnetic adjustment slot 410a, a plurality of second magnetic adjustment slots 410b, and a plurality of third magnetic adjustment slots 410c. The first magnetic adjustment slot 410a is disposed on the magnetic pole center line 90 of the magnet slot 300. Along the outer peripheral wall of the rotor core 20 to the magnet slot 300, the length of the first magnetic adjustment slot 410a is not greater than that of the adjacent second magnetic adjustment slot 410b, and / or the length of the first magnetic adjustment slot 410a is not greater than that of the adjacent third magnetic adjustment slot.

[0202] Multiple second magnetic adjustment slots 410b are placed parallel to each other on the first circumferential side of the first magnetic adjustment slot 410a, and multiple third magnetic adjustment slots 410c are placed parallel to each other on the second circumferential side of the first magnetic adjustment slot 410a. Each second magnetic adjustment slot 410b and one third magnetic adjustment slot 410c are arranged symmetrically about the magnetic pole center line 90 of the rotor core 20 as the axis of symmetry.

[0203] In the magnet slot 300, the two magnetic slot portions 310 form an included angle α with respect to the end faces of the outer peripheral wall of the rotor core 20, satisfying: 0.5 < α / 180° < 0.7.

[0204] The mass percentage of cerium in permanent magnet 80 is greater than 1% and less than 5%.

[0205] The magnetic pole portion of the rotor core 20 is provided with a rivet portion 600, which is located on one side of the magnetic pole center line 90 of the rotor core 20 and is adjacent to the first magnetic adjustment groove 410a.

[0206] The distance from the center of the magnet slot 300 to the center of the shaft hole 200 is denoted as d3, and the outer diameter of the rotor core 20 is denoted as D, where 0.6 < d3 / D < 0.7.

[0207] The minimum distance between the magnetizing structure 400 and the outer peripheral wall of the rotor core 20 is not less than 0.4 mm. The minimum distance between the magnetizing structure 400 and the magnet slot 300 is not less than 0.4 mm.

[0208] This application has a reasonable structure for motor 1, which can effectively improve the magnetic flux density amplitude of the air gap 70 of motor 1 and improve the torque density of motor 1.

[0209] like Figure 2 As shown, the first magnetic adjustment slot 410a is disposed on the magnetic pole center line 90. The length of the first magnetic adjustment slot 410a is not greater than the length of the adjacent second magnetic adjustment slot 410b, and / or the length of the first magnetic adjustment slot 410a is not greater than the length of the adjacent third magnetic adjustment slot 410c. This arrangement can adjust the direction of the magnetic lines of force of the motor 1, reduce leakage flux, improve rotor strength, and help improve the reliability of the motor 1 when it is running at high speed.

[0210] Multiple second magnetic adjustment slots 410b are placed parallel to each other on the first circumferential side of the first magnetic adjustment slot 410a, and multiple third magnetic adjustment slots 410c are placed parallel to each other on the second circumferential side of the first magnetic adjustment slot 410a. The second magnetic adjustment slots 410b and third magnetic adjustment slots 410c are arranged symmetrically about the first magnetic adjustment slot 410a. By symmetrically arranging the second magnetic adjustment slots 410b and third magnetic adjustment slots 410c, the distribution of magnetic field lines can be adjusted, improving the symmetry and sinusoidal nature of the magnetic field of motor 1, which is beneficial to reducing magnetic leakage.

[0211] Specifically, in the magnet slot 300, the end face of the magnetic slot portion 310 facing the outer peripheral wall of the rotor core 20 is designated as the reference surface. In the magnet slot 300, the included angle α formed between the two reference surfaces of the two magnetic slot portions 310 satisfies 0.5 < α / 180° < 0.7. This arrangement can increase the magnetic flux density amplitude of the air gap 70 of the motor 1, improve the amount of permanent magnet 80 used, and maximize the cost-effectiveness of the motor 1. Furthermore, it can weaken the back EMF harmonics of the motor 1, reduce the back EMF distortion rate of the motor 1, and help reduce the torque pulsation of the motor 1, thereby reducing the vibration and noise of the motor 1.

[0212] The mass percentage of cerium in the permanent magnet 80 is greater than 1% and less than 5%. Adding cerium to the permanent magnet 80 reduces the use of expensive rare earth materials, thus lowering the cost of the motor 1. However, the addition of cerium reduces the intrinsic coercivity of the permanent magnet 80, thereby weakening the motor 1's resistance to demagnetization. A cerium mass percentage greater than 1% and less than 5% can improve the cost-effectiveness of the motor 1 while meeting its demagnetization resistance requirements.

[0213] The rotor core 20 has a rivet portion 600 at its pole, which is located on one side of the magnetic pole centerline 90 and adjacent to the first magnetic adjustment slot 410a. If the rivet portion 600 is too close to the magnet slot 300, for example, if the rivet portion 600 is located below the first magnetic adjustment slot 410a, the magnet slot 300 will deform during the high-pressure punching process of the rotor lamination die, thus affecting the process of assembling the permanent magnet 80 into the magnet slot 300. The rivet portion 600 provided in this application can ensure the reliability of the riveting of the rotor lamination 500 and improve manufacturability.

[0214] The distance from the center of the magnet slot 300 to the center of the shaft hole 200 is denoted as d3, and the outer diameter of the rotor core 20 is denoted as D, where 0.6 < d3 / D < 0.7. This arrangement places the permanent magnet 80 near the outer peripheral wall of the rotor, which can reduce the leakage magnetic loss of the rotor magnet, increase the power density of the motor 1, and thus improve the torque output of the motor 1.

[0215] The minimum distance between the magnetic adjustment slot 410 and the outer peripheral wall of the rotor core 20 is not less than 0.4 mm. The minimum distance between the magnetic adjustment slot 410 and the magnet slot 300 is not less than 0.4 mm. This ensures the manufacturability of the rotor core 20, keeps the rotor strength within a safe range, and prevents deformation during high-speed rotation of the motor 1. This avoids the problem of excessive vibration and noise caused by uneven magnetic field distribution in the motor 1 due to excessive deformation of the rotor core 20, and improves the structural strength of the rotor core 20.

[0216] like Figure 5 As shown, compared with the motors in the related technology (where the magnetic pole part of the rotor core is not provided with a magnetic adjustment structure), the magnetic field line direction at the magnetic adjustment structure 400 in this application has changed, which will reduce the harmonics of the motor 1, weaken the torque pulsation and radial electromagnetic force, thereby improving vibration and noise.

[0217] The radial electromagnetic force of motor 1 is an important indicator of the vibration and noise level of motor 1. The magnitude of the radial electromagnetic force varies with space and time. In this application, the spatial electromagnetic force is described by order, and the temporal electromagnetic force is described by harmonics. Figure 6 As shown, the spatial order of the radial electromagnetic force in this application is significantly lower than that of related technologies. Since a smaller spatial order of the radial electromagnetic force has a greater impact on vibration and noise, the focus is primarily on the 4th and 8th order radial electromagnetic force values. Figure 6 As can be seen, the solution of this application reduces the 4th and 8th order spatial radial electromagnetic forces by 24.4% and 14.2% respectively compared with the related technologies, which is beneficial to improving the vibration and noise of motor 1.

[0218] like Figure 7 As shown, compared with the solutions in related technologies, the radial electromagnetic force amplitude of the motor 1 in this application is significantly reduced, which is beneficial to reduce torque pulsation and reduce the vibration and noise of the motor 1.

[0219] like Figure 8 As shown, compared with the solutions in the related art, the radial electromagnetic force amplitude of the motor 1 of this application is significantly reduced (especially when the ratio of d1 / H is between 0.25 and 0.6).

[0220] like Figure 9 As shown, compared with the solutions in the related art, the output torque of the motor 1 of this application is significantly increased (especially when the ratio of α / 180° is between 0.5 and 0.7).

[0221] like Figure 10 As shown, compared with the solutions in the related art, the output torque of the motor 1 of this application is significantly increased (especially when the ratio of d3 / D is between 0.6 and 0.7).

[0222] In this application, the term "multiple" refers to two or more unless otherwise expressly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0223] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The above descriptions are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electric machine characterized in that, The motor comprises: a stator core; a rotor core rotatably arranged in the stator core, an air gap being enclosed between an outer peripheral wall of the rotor core and an inner peripheral wall of the stator core, a minimum value of the air gap being denoted as δ; the rotor core is provided with a shaft hole and a plurality of magnet grooves, the plurality of magnet grooves being arranged at intervals around the shaft hole, a portion of the rotor core between the magnet grooves and the outer peripheral wall of the rotor core being provided with a magnetic adjustment structure; the magnet groove comprises two magnetic groove portions, the magnetic groove portions comprising an inner end close to the shaft hole and an outer end away from the shaft hole, the inner ends of the two magnetic groove portions being connected to each other, the outer ends of the two magnetic groove portions being away from each other, and an end face of the magnetic groove portions towards the outer peripheral wall of the rotor core forming an included angle α, a width of the magnetic groove portions in the circumferential direction of the rotor core being denoted as H; the magnetic adjustment structure comprises a plurality of magnetic adjustment grooves, the plurality of magnetic adjustment grooves being arranged at intervals in the circumferential direction of the rotor core, a width of the magnetic adjustment groove in the circumferential direction of the rotor core being denoted as d1, and a minimum distance of the magnetic adjustment groove to the outer peripheral wall of the rotor core being denoted as d2; wherein 0.25×δ / d2 2. The electric machine of claim 1, wherein, d1 and H satisfy: 0.25 3. The electric machine of claim 1 or 2, characterized in that α satisfies: 0.5 4. The electric machine of claim 1 or 2, wherein, a distance of the magnet groove to the center of the shaft hole being denoted as d3, and an outer diameter of the rotor core being denoted as D, wherein 0.6 5. The electric machine of claim 1 or 2, wherein, a minimum distance of the magnetic adjustment structure to the outer peripheral wall of the rotor core is greater than or equal to 0.4 mm.

6. The electric machine of claim 1 or 2, wherein, a minimum distance of the magnetic adjustment structure to the magnet groove is greater than or equal to 0.4 mm.

7. The electric machine of claim 1 or 2, wherein, the magnetic adjustment structure comprises at least: a first magnetic adjustment groove, the first magnetic adjustment groove being located on a magnetic pole center line of the rotor core; a plurality of second magnetic adjustment grooves, the plurality of second magnetic adjustment grooves being arranged at intervals on a first circumferential side of the first magnetic adjustment groove in the circumferential direction of the rotor core; a plurality of third magnetic adjustment grooves, the plurality of third magnetic adjustment grooves being arranged at intervals on a second circumferential side of the first magnetic adjustment groove in the circumferential direction of the rotor core.

8. The electric machine of claim 7, wherein, the rotor core comprises a plurality of stacked rotor laminations, the rotor laminations being provided with rivet portions; the rivet portions are located between the first magnetic adjustment groove and the third magnetic adjustment groove arranged adjacent to the first magnetic adjustment groove, and / or the rivet portions are located between the first magnetic adjustment groove and the second magnetic adjustment groove arranged adjacent to the first magnetic adjustment groove.

9. The electric machine of claim 8, wherein, the number of the rivet portions is a plurality, and at least one rivet portion is provided at each magnetic adjustment structure.

10. The electric machine of claim 7, wherein, a length of the first magnetic adjustment groove is denoted as l1, a length of the second magnetic adjustment groove is denoted as l2, and a length of the third magnetic adjustment groove is denoted as l3, along the magnet groove to the outer peripheral wall of the rotor core; wherein l1≤l2, l1≤l3.

11. The electric machine of claim 7, wherein, any two of the plurality of second magnetic adjustment grooves are arranged in parallel, and each second magnetic adjustment groove and a third magnetic adjustment groove are symmetrically arranged with the magnetic pole center line of the rotor core as the axis of symmetry.

12. A compressor characterized by, The motor comprises: the motor according to any one of claims 1 to 11.

13. A vehicle characterized by comprising: The motor comprises: The electric machine of any one of claims 1 to 11; or The compressor of claim 12.

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