Motor, compressor and vehicle

Abstract

The invention provides a motor, a compressor and a vehicle. The motor comprises a rotor iron core, and the rotor iron core is provided with a shaft hole, a plurality of magnet grooves and a plurality of magnetic adjusting structures. In each magnet groove, an included angle alpha is formed by the end surfaces, facing the outer peripheral wall of the rotor core, of the two magnetic groove parts; the magnetism adjusting structure comprises a first magnetism adjusting groove; the plurality of second magnetism adjusting grooves are located on the first side of the first magnetism adjusting groove in the circumferential direction; the plurality of third magnetic adjusting grooves are located on the second side of the first magnetic adjusting groove in the circumferential direction, and the plurality of second magnetic adjusting grooves and the plurality of third magnetic adjusting grooves are arranged in the circumferential direction of the rotor iron core at intervals; an included angle theta is formed between the end faces, close to each other, of the first magnetism adjusting groove and the second magnetism adjusting groove which is close to the first magnetism adjusting groove; in the circumferential direction of the rotor iron core, the distance between every two adjacent second magnetism adjusting grooves is recorded as d1, the distance between the first groove wall and the second groove wall of each magnetic groove part is recorded as d2, and 2 * theta * d1 / d2lt is obtained; alpha.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and more specifically, to a motor, a compressor, and a vehicle. Background Art

[0002] With the rapid popularization of new energy vehicles, users' demands for the refrigeration and heating of automotive air conditioners in the cockpit have become more urgent. The electric compressor operates driven by the permanent magnet motor inside it, thus providing convenience for the driver to adjust the temperature inside the vehicle.

[0003] However, with the development trend of high-speed operation of permanent magnet motors, the vibration and noise problems of permanent magnet motors have become prominent, seriously affecting driving comfort. Summary of the Invention

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

[0005] To this end, a first aspect of the present application provides a motor.

[0006] A second aspect of the present application provides a compressor.

[0007] A third aspect of the present application provides a vehicle.

[0008] In view of this, a first aspect of the present application provides a motor, including: a rotor core, the rotor core is provided with a shaft hole, a plurality of magnet slots, and a plurality of magnetic flux adjusting structures, the plurality of magnet slots are arranged at intervals around the shaft hole, and at least one magnetic flux adjusting structure is provided between the magnet slot and the outer peripheral wall of the rotor core; the magnet slot includes two magnetic slot parts, the magnetic slot part includes an inner end close to the shaft hole and an outer end far from the shaft hole, the inner ends of the two magnetic slot parts are connected to each other, the outer ends of the two magnetic slot parts are far from each other, in the magnet slot, the end faces of the two magnetic slot parts facing the outer peripheral wall of the rotor core form an included angle α; the magnetic flux adjusting structure includes: a first magnetic flux adjusting groove; a plurality of second magnetic flux adjusting grooves, the plurality of second magnetic flux adjusting grooves are located on the first circumferential side of the first magnetic flux adjusting groove, and the plurality of second magnetic flux adjusting grooves are arranged at intervals in the circumferential direction of the rotor core; a plurality of third magnetic flux adjusting grooves, the plurality of third magnetic flux adjusting grooves are located on the second circumferential side of the first magnetic flux adjusting groove, and the plurality of third magnetic flux adjusting grooves are arranged at intervals in the circumferential direction of the rotor core; the end faces of the second second magnetic flux adjusting groove adjacent to the first magnetic flux adjusting groove and the first magnetic flux adjusting groove close to each other form an included angle θ; along the circumferential direction of the rotor core, the distance between two adjacent second magnetic flux adjusting grooves is denoted as d1; the magnetic slot part has a first slot wall and a second slot wall arranged opposite and at intervals, the first slot wall is located between the second slot wall and the magnetic flux adjusting structure, and the distance from the first slot wall to the second slot wall is denoted as d2; wherein, 2×θ×d1 / d2 < α.

[0009] A motor provided by the present application includes a rotor core. The rotor core is provided with a shaft hole, a plurality of magnet slots, and a plurality of magnetic flux adjusting structures. The magnet slots are located between the shaft hole and the outer peripheral wall of the rotor core, and the plurality of magnet slots are arranged at intervals around the shaft hole.

[0010] At least one magnetic flux adjusting structure is provided between the magnet slot and the outer peripheral wall of the rotor core. For example, at least one magnetic flux adjusting structure is provided between any one of the plurality of magnet slots and the outer peripheral wall of the rotor core, that is, at least one magnetic flux adjusting structure is provided between each magnet slot and the outer peripheral wall of the rotor core. Another example is that in a part of the plurality of magnet slots, at least one magnetic flux adjusting structure is provided between the magnet slot and the outer peripheral wall of the rotor core, that is, only some magnet slots are provided with at least one magnetic flux adjusting structure between the magnet slot and the outer peripheral wall of the rotor core.

[0011] The matching structure of the shaft hole, the plurality of magnet slots, and the plurality of magnetic flux adjusting structures is further defined.

[0012] The magnet slot includes two magnetic slot portions. Any one of the two magnetic slot portions includes an inner end and an outer end. The inner end of the magnetic slot portion is arranged close to the shaft hole, and the outer end of the magnetic slot portion is arranged away from the shaft hole. And in the magnet slot, the inner ends of the two magnetic slot portions are connected to each other, and the outer ends of the two magnet slots are away from each other. That is, the two magnetic slot portions in the magnet slot are arranged in a "V" shape.

[0013] In the magnet slot, the end face of the magnetic slot portion facing the outer peripheral wall of the rotor core is denoted as the reference surface. In the magnet slot, an included angle α is formed between the two reference surfaces of the two magnetic slot portions.

[0014] The magnetic flux adjusting structure includes a first magnetic flux adjusting slot, a plurality of second magnetic flux adjusting slots, and a plurality of third magnetic flux adjusting slots. Along the circumferential direction of the rotor core, the first magnetic flux adjusting slot has a circumferential first side and a circumferential second side. The plurality of second magnetic flux adjusting slots are located on the circumferential first side of the first magnetic flux adjusting slot, and the plurality of second magnetic flux adjusting slots are arranged at intervals along the circumferential direction of the rotor core. The plurality of third magnetic flux adjusting slots are located on the circumferential second side of the first magnetic flux adjusting slot, and the plurality of third magnetic flux adjusting slots are arranged at intervals along the circumferential direction of the rotor core. It can be understood that the plurality means the number is greater than or equal to 2. Among them, the second second magnetic flux adjusting slot adjacent to the first magnetic flux adjusting slot and the end face of the first magnetic flux adjusting slot close to each other form an included angle θ. Along the circumferential direction of the rotor core, the distance between two adjacent second magnetic flux adjusting slots is denoted as d1. For example, along the circumferential direction of the rotor core, the distance between the first second magnetic flux adjusting slot adjacent to the first magnetic flux adjusting slot and the second second magnetic flux adjusting slot is denoted as d1. The magnetic slot portion has a first slot wall and a second slot wall that are opposite and spaced apart. The first slot wall is located between the second slot wall and the magnetic flux adjusting structure, and the distance from the first slot wall to the second slot wall is denoted as d2.

[0015] And define the relationships among α, θ, d1, and d2 to satisfy 2×θ×d1 / d2 < α. This setting adjusts the direction of the magnetic field lines of the motor, can weaken the back electromotive force harmonics of the motor, and thus can reduce the distortion rate of the back electromotive force of the motor. In this way, it is beneficial to reduce the torque ripple of the motor, and thus can reduce the vibration and noise of the motor.

[0016] It can be understood that the level of electromagnetic vibration and noise of the motor is related to the level of radial electromagnetic force and torque ripple.

[0017] The radial electromagnetic force of the motor is an important indicator reflecting the level of vibration and noise of the motor, and the magnitude of the radial electromagnetic force changes with space and time. In this application, by making α, θ, d1, and d2 satisfy 2×θ×d1 / d2 < α, the radial electromagnetic force of the motor is significantly reduced under the spatial order, which is beneficial to improving the vibration and noise of the motor. At the same time, under the same load condition, the peak-to-peak value of the torque ripple of the motor is also reduced, thereby further reducing the vibration and noise of the motor. In addition, this setting can also reduce the distortion rate of the back electromotive force of the motor, making the back electromotive force have better sinusoidality, and the output torque of the motor during load operation is smoother. In this way, the harmonics of the motor can be weakened, and thus the vibration and noise of the motor can be reduced.

[0018] According to the motor of the present application described above, it may further have the following additional technical features:

[0019] In some embodiments, optionally, the motor further includes: a stator core, the stator core includes a stator yoke and a plurality of stator teeth, the plurality of stator teeth are connected to the inner peripheral wall of the stator yoke, the plurality of stator teeth are arranged at intervals along the circumferential direction of the stator yoke, the stator teeth surround the circumferential side of the rotor core, and along the rotor core to the stator core, the width of the stator yoke is denoted as d3; wherein, α, θ, d1, and d3 satisfy: 30 / d3 < α / (θ×d1) < 36 / d3.

[0020] In this embodiment, the structure of the motor is further defined.

[0021] The motor further includes a stator core, and the rotor core is rotatably arranged inside the stator core. Specifically, the stator core includes a stator yoke and a plurality of stator teeth, any one of the plurality of stator teeth is connected to the inner peripheral wall of the stator yoke, and the plurality of stator teeth are arranged at intervals along the circumferential direction of the stator yoke. The plurality of stator teeth enclose an installation cavity, and the rotor core is arranged in the installation cavity and can rotate relative to the stator core.

[0022] Along the rotor core to the stator core, the width of the stator yoke is denoted as d3. It can be understood that the stator yoke has an inner peripheral wall and an outer peripheral wall, and the inner peripheral wall and the outer peripheral wall are opposite and spaced apart. The distance from the inner peripheral wall of the stator yoke to the outer peripheral wall of the stator yoke is denoted as d3.

[0023] Among them, the relationship between α, θ, d1, and d3 is defined to satisfy: 30 / d3 < α / (θ × d1) < 36 / d3. That is, the mating structure of the stator core and the rotor core is defined. That is, the width of the stator yoke of the stator core, the included angle α formed by the end faces of the two magnetic slot sections facing the outer peripheral wall of the rotor core, the included angle θ formed by the end faces of the second second magnetic modulation slot adjacent to the first magnetic modulation slot and the first magnetic modulation slot close to each other, and the distance d1 between two adjacent second magnetic modulation slots are related.

[0024] By defining through the above formula, the direction of the magnetic lines of force of the motor can be adjusted, the back electromotive force harmonics of the motor can be weakened, and further the distortion rate of the back electromotive force of the motor can be reduced. In this way, it is beneficial to reduce the torque ripple of the motor, and thus the vibration and noise of the motor can be reduced.

[0025] In some embodiments, optionally, d3 satisfies: 5 mm ≤ d3 ≤ 7 mm.

[0026] In this embodiment, the structure of the stator core is further defined such that along the rotor core to the stator core, the width d3 of the stator yoke is greater than or equal to 5 mm and less than or equal to 7 mm.

[0027] That is, the upper limit of the ratio of α / (θ × d1) is defined. For example, d3 = 5.5 mm, for example, d3 = 6 mm and d3 = 6.5 mm, etc., which are not listed one by one here.

[0028] If d3 is less than 5 mm, then the width of the stator yoke is too small, the magnetic field of the stator yoke is prone to saturation, the motor generates serious heat during heavy load, and the too small width of the stator yoke will make the stiffness of the stator core poor, and it is easy to deteriorate the vibration and noise of the motor.

[0029] If d3 is greater than 7 mm, then the width of the stator yoke is too large, the stator slot area is correspondingly reduced, and the efficiency and load-carrying capacity of the motor will be reduced.

[0030] In some embodiments, optionally, the first magnetic modulation slot is located on the magnetic pole center line of the rotor core.

[0031] In this embodiment, the structure of the rotor core is further defined such that the first magnetic modulation slot is located on the magnetic pole center line of the rotor core. In this way, the direction of the magnetic lines of force of the motor can be adjusted, the magnetic field distribution can be adjusted, the magnetic leakage can be reduced, and the magnetic field distribution becomes more symmetrical. It is beneficial to reduce the high-frequency radial electromagnetic force of the motor and is beneficial to improving the vibration and noise of the motor.

[0032] In addition, the first magnetic modulation slot is located on the magnetic pole center line, which can determine the position of the first magnetic modulation slot according to the center of the shaft hole and the center of the magnet slot, providing an effective and reliable structural support for ensuring the controllability of the magnetic line of force routing.

[0033] In some embodiments, optionally, along the magnet slot to the outer peripheral wall of the rotor core, the length of the first magnetic modulation slot is denoted as l1, the length of the second magnetic modulation slot adjacent to the first magnetic modulation slot is denoted as l2, and the length of the third magnetic modulation slot adjacent to the first magnetic modulation slot is denoted as l3; wherein, l1 ≤ l2, l1 ≤ l3.

[0034] In this embodiment, the matching structure of the first magnetic modulation slot, the second magnetic modulation slot and the third magnetic modulation slot is further defined.

[0035] So that along the magnet slot to the outer peripheral wall of the rotor core, the length of the first magnetic modulation slot is denoted as l1, the length of the second magnetic modulation slot adjacent to the first magnetic modulation slot is denoted as l2, and the length of the third magnetic modulation slot adjacent to the first magnetic modulation slot is denoted as l3.

[0036] Wherein, l1 ≤ l2, l1 ≤ l3.

[0037] That is to say, the length of the first magnetic modulation slot located on the magnetic pole center line is equal to the length of the second magnetic modulation slot located on the first side of the magnetic pole center line. Or, the length of the first magnetic modulation slot located on the magnetic pole center line is shorter than the length of the second magnetic modulation slot located on the first side of the magnetic pole center line.

[0038] The length of the first magnetic modulation slot located on the magnetic pole center line is equal to the length of the third magnetic modulation slot located on the second side of the magnetic pole center line. Or, the length of the first magnetic modulation slot located on the magnetic pole center line is shorter than the length of the third magnetic modulation slot located on the second side of the magnetic pole center line.

[0039] The first magnetic modulation slot, the second magnetic modulation slot and the third magnetic modulation slot cooperate to adjust the magnetic field line direction of the motor, which is beneficial to reducing magnetic leakage, improving the strength of the rotor, and improving the reliability of the motor during high-speed operation.

[0040] It can be understood that on the axial end face of the rotor core, the line connecting the center of the magnet slot and the center of the shaft hole is the magnetic pole center line, abbreviated as the "d" axis. The first magnetic modulation slot is located on the magnetic pole center line, which can determine the position of the first magnetic modulation slot according to the center of the shaft hole and the center of the magnet slot, providing an effective and reliable structural support for ensuring the controllability of the magnetic field line routing.

[0041] In some embodiments, optionally, multiple second magnetic modulation slots are arranged in parallel, and each second magnetic modulation slot and a third magnetic modulation slot are symmetrically arranged with respect to the magnetic pole center line of the rotor core.

[0042] In this embodiment, the structure of the magnetic modulation structure is further defined.

[0043] Multiple second magnetic modulation slots are arranged in parallel, that is, any two of the multiple second magnetic modulation slots are arranged in parallel.

[0044] Each second magnetic slot adjustment groove and a third magnetic slot adjustment groove are symmetrically arranged with the magnetic pole center line of the rotor core as the axis of symmetry. That is, any one of the multiple second magnetic slot adjustment grooves cooperates with a third magnetic slot adjustment groove.

[0045] By setting the symmetrically arranged second magnetic slot adjustment grooves and third magnetic slot adjustment grooves to adjust the distribution of magnetic lines of force, the symmetry and sinusoidality of the magnetic field arrangement of the motor are improved, which is beneficial to reducing magnetic leakage, thereby reducing torque ripple during the operation of the motor and improving the vibration and noise during the operation of the motor.

[0046] At the same time, this setting can ensure the dynamic balance of the rotor during rotation, reduce the swing of the shafting structure of the compressor, and effectively improve the content of each harmonic of the air-gap magnetic density of the motor. In this way, on the one hand, the stator iron loss of the motor is reduced, which is beneficial to improving the operation efficiency of the motor. On the other hand, the vibration and noise of the motor can be improved, and further the operation noise of the compressor can be reduced.

[0047] In some embodiments, optionally, the part of the outer peripheral wall of the rotor core opposite to the magnet slot includes two arc segment groups, and the two arc segment groups are symmetrically arranged with the magnetic pole center line of the rotor core as the axis of symmetry. The arc segment group includes a first arc segment, a second arc segment, and a third arc segment arranged along the circumferential direction of the rotor core. The first arc segment is arranged adjacent to the magnetic pole center line of the rotor core, and the second arc segment is located between the first arc segment and the third arc segment; along the circumferential direction of the rotor core, the part of the rotor core between the ends of two adjacent magnet slots is denoted as the inter-pole part, and the part of the outer peripheral wall of the rotor core opposite to the inter-pole part is the fourth arc segment; the center of the circle corresponding to any one of the first arc segment and the fourth arc segment coincides with the center of the shaft hole, and the radius corresponding to the fourth arc segment is smaller than the radius corresponding to the first arc segment; the center of the circle corresponding to any one of the second arc segment and the third arc segment is located on the magnetic pole center line of the rotor core; the minimum value of the distance from the side of the magnet slot away from the shaft hole to the center of the shaft hole is denoted as a, the distance from the center of the circle corresponding to the second arc segment to the center of the shaft hole is denoted as b, the distance from the center of the circle corresponding to the third arc segment to the center of the shaft hole is denoted as c, the radius corresponding to the first arc segment is denoted as R1, and the radius corresponding to the fourth arc segment is denoted as R2, where 2×(b + c)×(R1 - R2) < a×d2.

[0048] In this embodiment, the shape of the outer peripheral wall of the rotor core is defined such that the part of the outer peripheral wall of the rotor core opposite to the magnet slot includes two arc segment groups. Along the circumferential direction of the rotor core, the part of the rotor core between the ends of two adjacent magnet slots is denoted as the inter-pole part, and the part of the outer peripheral wall of the rotor core opposite to the inter-pole part is the fourth arc segment. It can be understood that the outer peripheral wall of the rotor core is divided to form multiple regions, each region is opposite to a magnet slot, and two arc segment groups are provided at each region. In each region, the two arc segment groups are symmetrically arranged with the magnetic pole center line of the rotor core as the axis of symmetry. A fourth arc segment is clamped between two adjacent regions.

[0049] The arc segment group includes a first arc segment, a second arc segment, and a third arc segment arranged along the circumference of the rotor core. The first arc segment is located adjacent to the magnetic pole centerline of the rotor core, and the second arc segment is located between the first arc segment and the third arc segment. For example, the first arc segment extends from the magnetic pole centerline along the circumference of the rotor core, the second arc segment is located on a side of the first arc segment facing away from the magnetic pole centerline, and the third arc segment is located on a side of the second arc segment facing away from the first arc segment.

[0050] The matching structure of the first arc segment, the second arc segment, the third arc segment, and the fourth arc segment is further defined. The center of the circle corresponding to the second arc segment is located on the magnetic pole centerline of the rotor core, that is, the center of the circle corresponding to the first arc segment coincides with the center of the shaft hole, and the center of the circle corresponding to the fourth arc segment coincides with the center of the shaft hole. In addition, the radius corresponding to the fourth arc segment is smaller than the radius corresponding to the first arc segment. The center of the circle corresponding to either the second arc segment or the third arc segment is located on the magnetic pole centerline of the rotor core, that is, the center of the circle corresponding to the second arc segment is located on the magnetic pole centerline of the rotor core, and the center of the circle corresponding to the third arc segment is located on the magnetic pole centerline of the rotor core.

[0051] The minimum distance from the side of the magnet slot facing away from the shaft hole to the center of the shaft hole is denoted as a. The distance from the center of the circle corresponding to the second arc segment to the center of the shaft hole is denoted as b. The distance from the center of the circle corresponding to the third arc segment to the center of the shaft hole is denoted as c. The radius corresponding to the first arc segment is denoted as R1. The radius corresponding to the fourth arc segment is denoted as R2. The relationship between a, b, c, R1, and R2 is defined to satisfy: 2×(b+c)×(R1-R2)<a×d2.

[0052] That is to say, by limiting the relationship between a, b, c, R1 and R2 so that the above-mentioned relationship limitations are met, the distribution area of the air gap between the stator and rotor of the motor can be changed, so that the sinusoidal nature of the formed magnetic field is higher, and the output torque of the motor is smoother when running under load. This is conducive to reducing the torque pulsation of the motor and weakening the harmonics of the motor, thereby reducing the vibration noise of the motor, which is conducive to improving the product's performance and market competitiveness.

[0053] On the other hand, the torque pulsation of the motor also depends to a large extent on the non-sinusoidal nature of the air gap magnetic field. The higher the harmonic content in the air gap magnetic field, the worse the output torque waveform of the motor, which not only affects the running smoothness of the motor, but also causes axial torsional vibration of the motor, further aggravating the vibration noise of the motor.

[0054] By setting, two arc segment groups are symmetrically arranged with the magnetic pole center line of the rotor core as the axis of symmetry. In this way, an unequal air gap that varies periodically along the circumferential direction of the rotor core can be formed between the outer peripheral wall of the rotor and the inner peripheral wall of the stator. In this way, the waveform of the air gap synthetic magnetic field can be optimized, the content of the harmonic magnetic field in the air gap magnetic field can be effectively reduced, the waveform of the air gap magnetic field approaches a sine waveform, thereby reducing the cogging torque and torque ripple of the motor, which is beneficial to reducing the vibration and noise of the motor. Moreover, when the content of the harmonic magnetic field is reduced, the iron loss generated by the high-frequency harmonic magnetic field can be reduced, and the iron loss of the motor in the high-speed range can be reduced. In this way, it is beneficial to improve the output torque of the motor and improve the service performance of the motor.

[0055] In some embodiments, optionally, a, b, c, R1, and R2 satisfy: 0.05 < (b + c) × (R1 - R2) / (a × d2) < 0.5.

[0056] In this embodiment, the structure of the rotor core is further defined such that the minimum distance a from the side of the magnet slot facing away from the shaft hole to the center of the shaft hole, the distance b from the center of the circle corresponding to the second arc segment to the center of the shaft hole, the distance c from the center of the circle corresponding to the third arc segment to the center of the shaft hole, the radius R1 corresponding to the first arc segment, and the radius R2 corresponding to the fourth arc segment satisfy: 0.05 < (b + c) × (R1 - R2) / (a × d2) < 0.5. In this way, it is beneficial to reduce the torque ripple of the motor, and the harmonics of the motor can also be weakened, thereby being able to reduce the vibration and noise of the motor, which is beneficial to improving the service performance and market competitiveness of the product.

[0057] In some embodiments, optionally, α, d2, θ, and a satisfy: 0.76 < (α × d2) / (θ × a) < 1.42.

[0058] In this embodiment, the structure of the magnet slot is further defined such that the magnet slot includes two magnet groove portions.

[0059] Any one of the two magnet groove portions includes an inner end and an outer end. The inner end of the magnet groove portion is arranged close to the shaft hole, and the outer end of the magnet groove portion is arranged far from the shaft hole. And, in the magnet slot, the inner ends of the two magnet groove portions are connected to each other, and the outer ends of the two magnet groove portions are far from each other. That is, the two magnet groove portions in the magnet slot are arranged in a "V" shape.

[0060] In the magnet slot, the end face of the magnet groove portion facing the outer peripheral wall of the rotor core is denoted as the reference plane. In the magnet slot, an included angle α is formed between the two reference planes of the two magnet groove portions.

[0061] Define the relationship among the included angle α, the distance d2 from the first groove wall to the second groove wall of the magnetic groove part, the included angle θ formed by the end faces of the second magnetic modulation groove adjacent to the first magnetic modulation groove and the first magnetic modulation groove approaching each other, and the minimum distance a from the side of the magnet groove facing away from the shaft hole to the center of the shaft hole, so that it satisfies: 0.76 < (α × d2) / (θ × a) < 1.42.

[0062] In this way, the permanent magnetic field of the rotor can be fully utilized, and the torque output ability of the motor can be improved.

[0063] If (α × d2) / (θ × a) is greater than or equal to 1.42, then the angle of the "V" - shaped structure enclosed by the two magnetic groove parts is smaller, and the distance from the magnet groove to the shaft hole becomes smaller. In this way, on the one hand, the material of the permanent magnet of the motor will be wasted, increasing the production cost of the motor; on the other hand, the magnetic concentrating ability of the motor is weak, and the torque output ability of the motor is weak.

[0064] If (α × d2) / (θ × a) is less than or equal to 0.76, then the angle of the "V" - shaped structure enclosed by the two magnetic groove parts is larger, and the distance from the magnet groove to the shaft hole becomes larger. Then, the load - bearing capacity of the permanent magnet of the motor will be reduced, and in this way, the torque output ability of the motor will be decreased.

[0065] That is to say, when α, d2, θ and a satisfy the above - mentioned parameter limitations, the production cost of the motor and the torque output ability can be taken into account.

[0066] In some embodiments, optionally, the rotor core includes a plurality of stacked rotor punching sheets, and the rotor punching sheets are provided with riveting parts, and the riveting parts are located between the first magnetic modulation groove and the third magnetic modulation groove adjacent to the first magnetic modulation groove.

[0067] In this embodiment, the structure of the rotor core is further defined such that the rotor core includes a plurality of rotor punching sheets, and the rotor punching sheets are provided with riveting parts. [[ID=X]] [[ID=Y]]

[0068] The plurality of rotor punching sheets are stacked along the axial direction of the rotor core to form the rotor core, and the riveting parts on two adjacent rotor punching sheets can cooperate with each other so that the plurality of rotor punching sheets are connected to each other axially, thereby forming the rotor core.

[0069] It can be understood that the riveting buckle part is located between the first magnetic tuning groove and the third magnetic tuning groove arranged adjacent to the first magnetic tuning groove. That is to say, the riveting buckle part is located on one side of the magnetic pole center line, and the riveting buckle part is arranged adjacent to the first magnetic tuning groove. If the riveting buckle part is too close to the magnet groove, for example, the riveting buckle part is arranged between the magnet groove and the magnetic tuning structure, then, during the high-speed stamping process of the rotor punching sheet die, the magnet groove will be deformed, resulting in a change in the size of the magnet groove, making the size of the magnet groove not match the size of the permanent magnet. In this way, it will affect the process of assembling the permanent magnet into the magnet groove. That is to say, the position setting of the riveting buckle part in this application can ensure the reliability of the riveting of the rotor punching sheet while improving the manufacturability, and can ensure the production efficiency and the yield rate of the product.

[0070] In some embodiments, optionally, the number of the riveting buckle parts is multiple, and at least one riveting buckle part is arranged between each first magnetic tuning groove and the third magnetic tuning groove arranged adjacent to the first magnetic tuning groove.

[0071] In this embodiment, the number and the distribution position of the riveting buckle parts are further defined.

[0072] Specifically, the number of the riveting buckle parts is multiple, and at least one riveting buckle part is arranged between any one of the multiple first magnetic tuning grooves and the third magnetic tuning groove arranged adjacent to the first magnetic tuning groove. The multiple riveting buckle parts are arranged at intervals around the shaft hole. This setting can ensure the balance and consistency of the forces at different positions of the rotor punching sheet. In this way, the overall external dimension of the rotor core can be ensured, and the safety and reliability of the product during use can be improved.

[0073] In some embodiments, optionally, the minimum distance from the magnetic tuning structure to the outer peripheral wall of the rotor core is greater than or equal to 0.4 mm.

[0074] In this embodiment, the matching structure between the magnetic tuning groove group and the rotor core is further defined, so that the distance from the magnetic tuning structure to the outer peripheral wall of the rotor core is denoted as k1, where the minimum value of k(1) is greater than or equal to 0.4 mm. This setting can ensure the manufacturability of the rotor core, make the strength of the rotor core within a safe range, avoid deformation during the high-speed rotation of the motor, and thus avoid the problem of large vibration and noise caused by uneven magnetic field distribution due to excessive deformation of the rotor core, and is beneficial to improving the structural strength of the rotor core.

[0075] In some embodiments, optionally, the minimum distance from the magnetic tuning structure to the magnet groove is greater than or equal to 0.4 mm.

[0076] In this embodiment, the mating structure of the magnetic modulation groove group and the magnet groove is further defined such that the distance from the magnetic modulation structure to the magnet groove is denoted as k2, where the minimum value of k2 is greater than or equal to 0.4 mm. This setting can ensure the manufacturability of the rotor core, keep the strength of the rotor core within a safe range, avoid deformation during high-speed rotation of the motor, thereby avoiding the problem of large vibration and noise caused by uneven magnetic field distribution due to excessive deformation of the rotor core, and is beneficial to improving the structural strength of the rotor core.

[0077] In some embodiments, optionally, the motor further includes: a plurality of permanent magnets, at least one permanent magnet is disposed in the magnet groove, and the permanent magnet contains cerium with a mass percentage of X%, where 1% < X% < 5%.

[0078] In this embodiment, the structure of the motor is further defined such that the motor further includes a plurality of permanent magnets, and at least one permanent magnet is disposed in each magnet groove. Among them, the permanent magnet contains cerium with a mass percentage of X%. Using a permanent magnet containing cerium as the magnetic pole can reduce the content of praseodymium and neodymium elements in the permanent magnet. In this way, the production cost of the permanent magnet can be reduced, and further the production cost of the motor can be reduced, solving the problem of high cost of the motor caused by the high price of rare earth materials such as praseodymium and neodymium in the related art.

[0079] By replacing the relatively expensive praseodymium and neodymium elements in the permanent magnet with cerium elements that are rich in content and relatively cheap in price, the price of the permanent magnet can be effectively reduced, and the cost performance of the motor can be improved.

[0080] In addition, the mass ratio of cerium element in the permanent magnet is greater than 1% and less than 5%. Adding cerium element to the permanent magnet can reduce the cost of the permanent magnet, thereby reducing the cost of the motor. However, the addition of cerium element will reduce the intrinsic coercivity of the permanent magnet and thus weaken the demagnetization resistance of the motor. When the mass ratio of cerium element is greater than 1% and less than 5%, the cost performance of the motor can be improved while meeting the requirements of the motor's demagnetization resistance.

[0081] A second aspect of the present invention provides a compressor, including: the motor as in the first aspect.

[0082] The compressor provided by the present invention includes the motor as in the first aspect, and thus has all the beneficial effects of the above motor, which will not be elaborated one by one here.

[0083] A third aspect of the present invention provides a vehicle, including: the motor as in the first aspect; or the compressor as in the second aspect.

[0084] The vehicle provided by the present invention includes the motor as in the first aspect or the compressor as in the second aspect, and thus has all the beneficial effects of the above motor or compressor, which will not be elaborated one by one here.

[0085] It should be noted that the vehicle can be a new energy vehicle. New energy vehicles include battery electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0086] The additional aspects and advantages of the present application will become apparent in the following description section or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0088] Figure 1 A schematic structural diagram of a motor according to an embodiment of the present application is shown;

[0089] Figure 2 A schematic structural diagram of a rotor core and a permanent magnet according to an embodiment of the present application is shown;

[0090] Figure 3 A schematic structural diagram of a rotor core according to an embodiment of the present application is shown;

[0091] Figure 4 A comparison data graph of the radial electromagnetic force amplitude and spatial order of the motor in the present application and related technologies is shown;

[0092] Figure 5 A comparison data graph of the peak-to-peak torque ripple of the motor in the present application and related technologies is shown;

[0093] Figure 6 A comparison data graph of the back electromotive force harmonic ratio and harmonic order of the motor in the present application and related technologies is shown;

[0094] Figure 7 A comparison data graph of the back electromotive force waveform distortion rate varying with α / (θ×d1) of the motor in the present application and related technologies is shown.

[0095] Wherein, Figures 1 to 7 The corresponding relationship between the reference numerals and component names in is as follows:

[0096] 1 motor, 10 rotor core, 12 magnetic pole center line, 100 shaft hole, 200 magnet slot, 210 magnetic slot part, 212 inner end, 214 outer end, 216 first slot wall, 218 second slot wall, 300 magnetic flux regulation structure, 310 first magnetic flux regulation slot, 320 second magnetic flux regulation slot, 330 third magnetic flux regulation slot, 400 arc segment group, 410 first arc segment, 420 second arc segment, 430 third arc segment, 500 inter-pole part, 600 fourth arc segment, 700 rotor punching, 710 riveting part, 80 stator core, 82 stator yoke, 84 stator tooth, 90 permanent magnet. Detailed implementation manners

[0097] In order to more clearly understand the above objects, features and advantages of the present application, the present application will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0098] In the following description, many specific details are set forth in order to fully understand the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0099] The following refers to Figures 1 to 7 A motor 1, a compressor and a vehicle according to some embodiments of the present application.

[0100] As Figure 1 and Figure 2 shown, a motor 1 according to some embodiments of the present application includes a rotor core 10.

[0101] The rotor core 10 is provided with a shaft hole 100, a plurality of magnet slots 200 and a plurality of magnetic flux adjusting structures 300.

[0102] The plurality of magnet slots 200 are arranged at intervals around the shaft hole 100.

[0103] At least one magnetic flux adjusting structure 300 is provided between the magnet slot 200 and the outer peripheral wall of the rotor core 10.

[0104] The magnet slot 200 includes two magnetic slot portions 210.

[0105] The magnetic slot portion 210 includes an inner end 212 close to the shaft hole 100 and an outer end 214 far from the shaft hole 100.

[0106] The inner ends 212 of the two magnetic slot portions 210 are connected to each other, and the outer ends 214 of the two magnetic slot portions 210 are away from each other.

[0107] In the magnet slot 200, the end faces of the two magnetic slot portions 210 facing the outer peripheral wall of the rotor core 10 form an included angle α.

[0108] The magnetic flux adjusting structure 300 includes a first magnetic flux adjusting slot 310, a plurality of second magnetic flux adjusting slots 320 and a plurality of third magnetic flux adjusting slots 330.

[0109] The plurality of second magnetic flux adjusting slots 320 are located on the first circumferential side of the first magnetic flux adjusting slot 310.

[0110] And the plurality of second magnetic flux adjusting slots 320 are arranged at intervals in the circumferential direction of the rotor core 10.

[0111] A plurality of third magnetic slots 330 are located on the second circumferential side of the first magnetic slot 310.

[0112] And the plurality of third magnetic slots 330 are arranged at intervals in the circumferential direction of the rotor core 10.

[0113] The second magnetic slot 320 adjacent to the first magnetic slot 310 and the end faces of the first magnetic slot 310 close to each other form an included angle θ.

[0114] Along the circumferential direction of the rotor core 10, the distance between two adjacent second magnetic slots 320 is denoted as d1.

[0115] The magnetic slot portion 210 has a first slot wall 216 and a second slot wall 218 that are opposite and spaced apart. The first slot wall 216 is located between the second slot wall 218 and the magnetic modulation structure 300. The distance from the first slot wall 216 to the second slot wall 218 is denoted as d2.

[0116] Wherein, 2×θ×d1 / d2 < α.

[0117] An electric machine 1 provided by the present application includes a rotor core 10. The rotor core 10 is provided with a shaft hole 100, a plurality of magnet slots 200, and a plurality of magnetic modulation structures 300. The magnet slots 200 are located between the shaft hole 100 and the outer peripheral wall of the rotor core 10, and the plurality of magnet slots 200 are arranged at intervals around the shaft hole 100.

[0118] At least one magnetic modulation structure 300 is provided between the magnet slot 200 and the outer peripheral wall of the rotor core 10. For example, at least one magnetic modulation structure 300 is provided between any one of the plurality of magnet slots 200 and the outer peripheral wall of the rotor core 10, that is, at least one magnetic modulation structure 300 is provided between each magnet slot 200 and the outer peripheral wall of the rotor core 10. Another example is that in a part of the plurality of magnet slots 200, at least one magnetic modulation structure 300 is provided between the magnet slot 200 and the outer peripheral wall of the rotor core 10, that is, only part of the magnet slots 200 and the outer peripheral wall of the rotor core 10 are provided with at least one magnetic modulation structure 300.

[0119] The mating structure of the shaft hole 100, the plurality of magnet slots 200, and the plurality of magnetic modulation structures 300 is further defined.

[0120] The magnet slot 200 includes two magnetic slot portions 210. Any one of the two magnetic slot portions 210 includes an inner end 212 and an outer end 214. The inner end 212 of the magnetic slot portion 210 is arranged close to the shaft hole 100, and the outer end 214 of the magnetic slot portion 210 is arranged away from the shaft hole 100. And, in the magnet slot 200, the inner ends 212 of the two magnetic slot portions 210 are connected to each other, and the outer ends 214 of the two magnetic slot portions 210 are away from each other. That is, the two magnetic slot portions 210 in the magnet slot 200 are arranged in a "V" shape.

[0121] In the magnet slot 200, the end face of the magnetic slot portion 210 facing the outer peripheral wall of the rotor core 10 is denoted as the reference plane. In the magnet slot 200, an included angle α is formed between the two reference planes of the two magnetic slot portions 210.

[0122] The magnetic field regulation structure 300 includes a first magnetic field regulation slot 310, a plurality of second magnetic field regulation slots 320, and a plurality of third magnetic field regulation slots 330. Along the circumferential direction of the rotor core 10, the first magnetic field regulation slot 310 has a circumferential first side and a circumferential second side. The plurality of second magnetic field regulation slots 320 are located on the circumferential first side of the first magnetic field regulation slot 310, and the plurality of second magnetic field regulation slots 320 are arranged at intervals along the circumferential direction of the rotor core 10. The plurality of third magnetic field regulation slots 330 are located on the circumferential second side of the first magnetic field regulation slot 310, and the plurality of third magnetic field regulation slots 330 are arranged at intervals along the circumferential direction of the rotor core 10. It can be understood that the plurality refers to a number greater than or equal to 2. Among them, an included angle θ is formed between the end face of the second magnetic field regulation slot 320 adjacent to the first magnetic field regulation slot 310 and the end face of the first magnetic field regulation slot 310 that are close to each other. Along the circumferential direction of the rotor core 10, the distance between two adjacent second magnetic field regulation slots 320 is denoted as d1. As Figure 2 shown, along the circumferential direction of the rotor core 10, the distance between the first second magnetic field regulation slot 320 adjacent to the first magnetic field regulation slot 310 and the second second magnetic field regulation slot 320 is denoted as d1. The magnetic slot portion 210 has a first slot wall 216 and a second slot wall 218 that are opposite and spaced apart. The first slot wall 216 is located between the second slot wall 218 and the magnetic field regulation structure 300, and the distance from the first slot wall 216 to the second slot wall 218 is denoted as d2.

[0123] And the relationship between α, θ, d1, and d2 is defined so that 2×θ×d1 / d2 < α. This setting adjusts the direction of the magnetic force lines of the motor 1, can weaken the back electromotive force harmonics of the motor 1, and further can reduce the back electromotive force distortion rate of the motor 1. In this way, it is beneficial to reduce the torque ripple of the motor 1, and thus can reduce the vibration and noise of the motor 1.

[0124] It can be understood that the electromagnetic vibration and noise level of the motor 1 is related to the radial electromagnetic force level and the torque ripple.

[0125] The radial electromagnetic force of the motor 1 is an important index reflecting the vibration and noise level of the motor 1, and the magnitude of the radial electromagnetic force changes with space and time. In this application, by making α, θ, d1, and d2 satisfy 2×θ×d1 / d2 < α, the radial electromagnetic force of the motor 1 is significantly reduced at the spatial order, which is beneficial to improving the vibration and noise of the motor 1. At the same time, under the same load condition, the peak-to-peak value of the torque ripple of the motor 1 is also reduced, thereby further reducing the vibration and noise of the motor 1. In addition, this setting can also reduce the back electromotive force distortion rate of the motor 1, making the back electromotive force have better sinusoidality, and the output torque of the motor 1 during load operation is smoother. In this way, the harmonics of the motor 1 can be weakened, and further the vibration and noise of the motor 1 can be reduced.

[0126] In some embodiments, optionally, as Figure 1 shown, the motor 1 further includes a stator core 80.

[0127] The stator core 80 includes a stator yoke 82 and a plurality of stator teeth 84.

[0128] The plurality of stator teeth 84 are connected to the inner peripheral wall of the stator yoke 82.

[0129] The plurality of stator teeth 84 are arranged at intervals along the circumferential direction of the stator yoke 82.

[0130] The stator teeth 84 surround the circumferential side of the rotor core 10.

[0131] Along the rotor core 10 to the stator core 80, the width of the stator yoke 82 is denoted as d3; wherein, α, θ, d1 and d3 satisfy: 30 / d3 < α / (θ×d1) < 36 / d3.

[0132] In this embodiment, the structure of the motor 1 is further defined.

[0133] The motor 1 further includes a stator core 80, and the rotor core 10 is rotatably disposed within the stator core 80. Specifically, the stator core 80 includes a stator yoke 82 and a plurality of stator teeth 84. Any one of the plurality of stator teeth 84 is connected to the inner peripheral wall of the stator yoke 82, and the plurality of stator teeth 84 are arranged at intervals along the circumferential direction of the stator yoke 82. The plurality of stator teeth 84 enclose an installation cavity, and the rotor core 10 is disposed within the installation cavity, and the rotor core 10 can rotate relative to the stator core 80.

[0134] Along the rotor core 10 to the stator core 80, the width of the stator yoke 82 is denoted as d3. It can be understood that the stator yoke 82 has an inner peripheral wall and an outer peripheral wall, and the inner peripheral wall and the outer peripheral wall are opposite and spaced apart. The distance between the inner peripheral wall and the outer peripheral wall of the stator yoke 82 is denoted as d3.

[0135] Wherein, the relationship between α, θ, d1 and d3 is defined to satisfy: 30 / d3 < α / (θ×d1) < 36 / d3. That is to say, the matching structure of the stator core 80 and the rotor core 10 is defined. That is to say, the width of the stator yoke 82 of the stator core 80 has a correlation with the included angle α formed by the end faces of the two magnetic slot portions 210 segments facing the outer peripheral wall of the rotor core 10, the included angle θ formed by the second second magnetic modulation slot 320 adjacent to the first magnetic modulation slot 310 and the end faces of the first magnetic modulation slot 310 close to each other, and the distance d1 between two adjacent second magnetic modulation slots 320.

[0136] Limited by the above formula, the direction of the magnetic lines of force of the motor 1 can be adjusted, the back electromotive force harmonics of the motor 1 can be weakened, and further the back electromotive force distortion rate of the motor 1 can be reduced. In this way, it is beneficial to reduce the torque ripple of the motor 1, and thus the vibration and noise of the motor 1 can be reduced.

[0137] In some embodiments, optionally, d3 satisfies: 5 mm ≤ d3 ≤ 7 mm.

[0138] In this embodiment, the structure of the stator core 80 is further limited such that along the rotor core 10 to the stator core 80, the width d3 of the stator yoke 82 is greater than or equal to 5 mm and less than or equal to 7 mm.

[0139] That is, the upper limit of the ratio of α / (θ×d1) is defined. For example, d3 = 5.5 mm, for example, d3 = 6 mm and d3 = 6.5 mm, etc., which are not listed one by one here.

[0140] If d3 is less than 5 mm, then the width of the stator yoke 82 is too small, the magnetic field of the stator yoke 82 is prone to saturation, the motor 1 generates serious heat under heavy load, and the too small width of the stator yoke 82 will make the stiffness of the stator core 80 poor, and it is easy to deteriorate the vibration and noise of the motor 1.

[0141] If d3 is greater than 7 mm, then the width of the stator yoke 82 is too large, the stator slot area is correspondingly reduced, and the efficiency and load-carrying capacity of the motor 1 will be reduced.

[0142] In some embodiments, optionally, as Figure 2 shown, the first magnetic modulation groove 310 is located on the magnetic pole center line 12 of the rotor core 10.

[0143] In this embodiment, the structure of the rotor core 10 is further limited such that the first magnetic modulation groove 310 is located on the magnetic pole center line 12 of the rotor core 10. In this way, the direction of the magnetic lines of force of the motor 1 can be adjusted, the magnetic field distribution can be adjusted, the magnetic leakage can be reduced, and the magnetic field distribution becomes more symmetrical. It is beneficial to reduce the high-frequency radial electromagnetic force of the motor 1 and is beneficial to improving the vibration and noise of the motor 1.

[0144] In addition, the first magnetic modulation groove 310 is located on the magnetic pole center line 12, which can determine the position of the first magnetic modulation groove 310 according to the center of the shaft hole 100 and the center of the magnet groove 200, providing an effective and reliable structural support for ensuring the controllability of the magnetic line routing.

[0145] In some embodiments, optionally, as Figure 2 shown, along the magnet groove 200 to the outer peripheral wall of the rotor core 10, the length of the first magnetic modulation groove 310 is denoted as l1.

[0146] The length of the second magnetic modulation groove 320 arranged adjacent to the first magnetic modulation groove 310 is denoted as l2.

[0147] The length of the third magnetic modulation slot 330 disposed adjacent to the first magnetic modulation slot 310 is denoted as l3.

[0148] Wherein, l1 ≤ l2, and l1 ≤ l3.

[0149] In this embodiment, the matching structure of the first magnetic modulation slot 310, the second magnetic modulation slot 320, and the third magnetic modulation slot 330 is further defined.

[0150] Along the outer peripheral wall of the magnet slot 200 to the rotor core 10, the length of the first magnetic modulation slot 310 is denoted as l1, the length of the second magnetic modulation slot 320 disposed adjacent to the first magnetic modulation slot 310 is denoted as l2, and the length of the third magnetic modulation slot 330 disposed adjacent to the first magnetic modulation slot 310 is denoted as l3.

[0151] Wherein, l1 ≤ l2, and l1 ≤ l3.

[0152] That is to say, the length of the first magnetic modulation slot 310 located on the magnetic pole center line 12 is equal to the length of the second magnetic modulation slot 320 located on the first side of the magnetic pole center line 12. Or, the length of the first magnetic modulation slot 310 located on the magnetic pole center line 12 is shorter than the length of the second magnetic modulation slot 320 located on the first side of the magnetic pole center line 12.

[0153] The length of the first magnetic modulation slot 310 located on the magnetic pole center line 12 is equal to the length of the third magnetic modulation slot 330 located on the second side of the magnetic pole center line 12. Or, the length of the first magnetic modulation slot 310 located on the magnetic pole center line 12 is shorter than the length of the third magnetic modulation slot 330 located on the second side of the magnetic pole center line 12.

[0154] The first magnetic modulation slot 310, the second magnetic modulation slot 320, and the third magnetic modulation slot 330 cooperate to adjust the magnetic field line direction of the motor 1, which is beneficial to reducing magnetic leakage, improving the strength of the rotor, and improving the reliability of the motor 1 during high-speed operation.

[0155] It can be understood that on the axial end face of the rotor core 10, the connection line between the center of the magnet slot 200 and the center of the shaft hole 100 is the magnetic pole center line 12, abbreviated as the "d" axis. The first magnetic modulation slot 310 is located on the magnetic pole center line 12, and the position of the first magnetic modulation slot 310 can be determined according to the center of the shaft hole 100 and the center of the magnet slot 200, providing an effective and reliable structural support for ensuring the controllability of the magnetic field line routing.

[0156] In some embodiments, optionally, a plurality of second magnetic modulation slots 320 are arranged in parallel, and each second magnetic modulation slot 320 and a third magnetic modulation slot 330 are symmetrically arranged with respect to the magnetic pole center line 12 of the rotor core 10.

[0157] In this embodiment, the structure of the magnetic modulation structure 300 is further defined.

[0158] A plurality of second magnetic adjusting slots 320 are arranged in parallel, that is, any two of the plurality of second magnetic adjusting slots 320 are arranged in parallel.

[0159] Each second magnetic adjusting slot 320 and a third magnetic adjusting slot 330 are symmetrically arranged with respect to the magnetic pole center line 12 of the rotor core 10. That is, any one of the plurality of second magnetic adjusting slots 320 cooperates with a third magnetic adjusting slot 330.

[0160] By arranging the symmetrically arranged second magnetic adjusting slots 320 and third magnetic adjusting slots 330 to adjust the distribution of magnetic force lines, the symmetry and sinusoidality of the magnetic field arrangement of the motor 1 are improved, which is beneficial to reducing magnetic leakage, thereby reducing the torque ripple during the operation of the motor 1 and improving the vibration and noise during the operation of the motor 1.

[0161] At the same time, this setting can ensure the dynamic balance of the rotor during rotation, reduce the swing of the shafting structure of the compressor, and can effectively improve the content of each harmonic of the air-gap magnetic density of the motor 1. In this way, on the one hand, the stator iron loss of the motor 1 is reduced, which is beneficial to improving the operating efficiency of the motor 1, and on the other hand, the vibration and noise of the motor 1 can be improved, thereby reducing the operating noise of the compressor.

[0162] In some embodiments, optionally, as Figure 3 shown, the portion of the outer peripheral wall of the rotor core 10 opposite to the magnet slot 200 includes two arc segment groups 400.

[0163] The two arc segment groups 400 are symmetrically arranged with respect to the magnetic pole center line 12 of the rotor core 10.

[0164] The arc segment group 400 includes a first arc segment 410, a second arc segment 420, and a third arc segment 430 arranged along the circumferential direction of the rotor core 10.

[0165] The first arc segment 410 is arranged adjacent to the magnetic pole center line 12 of the rotor core 10.

[0166] The second arc segment 420 is located between the first arc segment 410 and the third arc segment 430.

[0167] Along the circumferential direction of the rotor core 10, the portion of the rotor core 10 between the ends of two adjacent magnet slots 200 is denoted as the inter-pole portion 500.

[0168] The portion of the outer peripheral wall of the rotor core 10 opposite to the inter-pole portion 500 is the fourth arc segment 600.

[0169] The center of the circle corresponding to any one of the first arc segment 410 and the fourth arc segment 600 coincides with the center of the shaft hole 100.

[0170] The radius corresponding to the fourth arc segment 600 is smaller than the radius corresponding to the first arc segment 410.

[0171] The center of either the second arc segment 420 or the third arc segment 430 is located on the magnetic pole center line 12 of the rotor core 10.

[0172] The minimum distance from the side of the magnet slot 200 facing away from the shaft hole 100 to the center of the shaft hole 100 is denoted as a.

[0173] The distance from the center of the circle corresponding to the second arc segment 420 to the center of the shaft hole 100 is denoted as b.

[0174] The distance from the center of the circle corresponding to the third arc segment 430 to the center of the shaft hole 100 is denoted as c.

[0175] The radius corresponding to the first arc segment 410 is denoted as R1.

[0176] The radius corresponding to the fourth arc segment 600 is denoted as R2.

[0177] Wherein, 2×(b + c)×(R1 - R2) < a×d2.

[0178] In this embodiment, the shape of the outer peripheral wall of the rotor core 10 is defined such that the part of the outer peripheral wall of the rotor core 10 opposite to the magnet slot 200 includes two arc segment groups 400. Along the circumferential direction of the rotor core 10, the part of the rotor core 10 located between the ends of two adjacent magnet slots 200 is denoted as the inter-pole part 500, and the part of the outer peripheral wall of the rotor core 10 opposite to the inter-pole part 500 is the fourth arc segment 600. It can be understood that the outer peripheral wall of the rotor core 10 is divided to form multiple regions, each region is opposite to a magnet slot 200, and two arc segment groups 400 are provided at each region. In each region, the two arc segment groups 400 are symmetrically arranged with respect to the magnetic pole center line 12 of the rotor core 10. A fourth arc segment 600 is interposed between two adjacent regions.

[0179] The arc segment group 400 includes a first arc segment 410, a second arc segment 420, and a third arc segment 430 arranged along the circumferential direction of the rotor core 10. The first arc segment 410 is arranged adjacent to the magnetic pole center line of the rotor core 10, and the second arc segment 420 is located between the first arc segment 410 and the third arc segment 430. For example, the first arc segment 410 extends along the circumferential direction of the rotor core 10 from the magnetic pole center line 12, the second arc segment 420 is located on the side of the first arc segment 410 facing away from the magnetic pole center line 12, and the third arc segment 430 is located on the side of the second arc segment 420 facing away from the first arc segment 410.

[0180] Further define the mating structure of the first arc segment 410, the second arc segment 420, the third arc segment 430, and the fourth arc segment 600. The center O2 corresponding to the second arc segment 420 is located on the magnetic pole center line 12 of the rotor core 10. That is, the center O1 corresponding to the first arc segment 410 coincides with the center of the shaft hole 100, and the center O1 corresponding to the fourth arc segment 600 coincides with the center of the shaft hole 100. In addition, the radius corresponding to the fourth arc segment 600 is smaller than the radius corresponding to the first arc segment 410. The center corresponding to any one of the second arc segment 420 and the third arc segment 430 is located on the magnetic pole center line 12 of the rotor core 10. That is, the center O2 corresponding to the second arc segment 420 is located on the magnetic pole center line 12 of the rotor core 10, and the center O3 corresponding to the third arc segment 430 is located on the magnetic pole center line 12 of the rotor core 10.

[0181] Wherein, the minimum value of the distance from the side of the magnet slot 200 away from the shaft hole 100 to the center of the shaft hole 100 is denoted as a. The distance from the center O2 corresponding to the second arc segment 420 to the center of the shaft hole 100 is denoted as b. The distance from the center O3 corresponding to the third arc segment 430 to the center of the shaft hole 100 is denoted as c. The radius corresponding to the first arc segment 410 is denoted as R1. The radius corresponding to the fourth arc segment 600 is denoted as R2. And define the relationship among a, b, c, R1, and R2 to satisfy: 2×(b + c)×(R1 - R2) < a×d2.

[0182] That is to say, by defining the relationship among a, b, c, R1, and R2 to satisfy the above relationship definition, in this way, the distribution area of the air gap between the stator and the rotor of the motor 1 can be changed, so that the sinusoidality of the formed magnetic field is higher, and the output torque of the motor 1 during load operation is smoother. In this way, it is beneficial to reduce the torque ripple of the motor 1, and the harmonics of the motor 1 can also be weakened. Furthermore, the vibration and noise of the motor 1 can be reduced, which is beneficial to improving the use performance and market competitiveness of the product.

[0183] On the other hand, the torque ripple of the motor 1 also depends to a great extent on the non-sinusoidality of the air gap magnetic field. The higher the harmonic content in the air gap magnetic field, the worse the output torque waveform of the motor 1, which not only affects the running stability of the motor 1, but also causes axial torsional vibration and crosstalk of the motor 1, further exacerbating the vibration and noise of the motor 1.

[0184] By setting, two arc segment groups 400 are symmetrically arranged with respect to the magnetic pole center line 12 of the rotor core 10 as the axis of symmetry. In this way, an unequal air gap that changes periodically along the circumferential direction of the rotor core 10 can be formed between the outer peripheral wall of the rotor and the inner peripheral wall of the stator. In this way, the waveform of the air gap synthetic magnetic field can be optimized, the content of the harmonic magnetic field in the air gap magnetic field can be effectively reduced, the waveform of the air gap magnetic field approaches a sine waveform, thereby reducing the cogging torque and torque ripple of the motor 1, which is beneficial to reducing the vibration and noise of the motor 1. Moreover, when the content of the harmonic magnetic field is reduced, the iron loss generated by the high-frequency harmonic magnetic field can be reduced, and the iron loss of the motor 1 in the high-speed range can be reduced. In this way, it is beneficial to increase the output torque of the motor 1 and improve the service performance of the motor 1.

[0185] In some embodiments, such as Figure 3 shown, optionally, a, b, c, R1, and R2 satisfy: 0.05 < (b + c)×(R1 - R2) / (a×d2) < 0.5.

[0186] In this embodiment, the structure of the rotor core 10 is further defined such that the minimum distance a from the side of the magnet slot 200 facing away from the shaft hole 100 to the center of the shaft hole 100, the distance b from the center of the circle corresponding to the second arc segment 420 to the center of the shaft hole 100, the distance c from the center of the circle corresponding to the third arc segment 430 to the center of the shaft hole 100, the radius R1 corresponding to the first arc segment 410, and the radius R2 corresponding to the fourth arc segment 600 satisfy: 0.05 < (b + c)×(R1 - R2) / (a×d2) < 0.5. In this way, it is beneficial to reduce the torque ripple of the motor 1, and the harmonics of the motor 1 can also be weakened, thereby reducing the vibration and noise of the motor 1, which is beneficial to improving the service performance and market competitiveness of the product.

[0187] Optionally, (b + c)×(R1 - R2) / (a×d2) = 0.1, (b + c)×(R1 - R2) / (a×d2) = 0.15, (b + c)×(R1 - R2) / (a×d2) = 0.2, (b + c)×(R1 - R2) / (a×d2) = 0.25, (b + c)×(R1 - R2) / (a×d2) = 0.3, (b + c)×(R1 - R2) / (a×d2) = 0.35, (b + c)×(R1 - R2) / (a×d2) = 0.4, and (b + c)×(R1 - R2) / (a×d2) = 0.45, etc., which are not listed one by one here.

[0188] In some embodiments, optionally, such as Figure 2 and Figure 3 shown, α, d2, θ, and a satisfy: 0.76 < (α×d2) / (θ×a) < 1.42.

[0189] In this embodiment, the structure of the magnet slot 200 is further defined such that the magnet slot 200 includes two magnet groove portions 210.

[0190] Any one of the two magnet groove portions 210 includes an inner end 212 and an outer end 214. The inner end 212 of the magnet groove portion 210 is disposed close to the shaft hole 100, and the outer end 214 of the magnet groove portion 210 is disposed away from the shaft hole 100. Moreover, in the magnet slot 200, the inner ends 212 of the two magnet groove portions 210 are connected to each other, and the outer ends 214 of the two magnet groove portions 210 are away from each other. That is to say, the two magnet groove portions 210 in the magnet slot 200 are arranged in a "V" shape.

[0191] In the magnet slot 200, the end face of the magnet groove portion 210 facing the outer peripheral wall of the rotor core 10 is denoted as the reference plane. In the magnet slot 200, an included angle α is formed between the two reference planes of the two magnet groove portions 210.

[0192] And the relationship between the included angle α, the distance d2 from the first groove wall 216 to the second groove wall 218 of the magnet groove portion 210, the included angle θ formed by the second magnetic tuning groove 320 disposed adjacent to the first magnetic tuning groove 310 and the end faces of the first magnetic tuning groove 310 close to each other, and the minimum value a of the distance from the side of the magnet slot 200 away from the shaft hole 100 to the center of the shaft hole 100 is defined to satisfy: 0.76 < (α × d2) / (θ × a) < 1.42.

[0193] In this way, the permanent magnetic field of the rotor can be fully utilized, and the torque output ability of the motor 1 can be improved.

[0194] If (α × d2) / (θ × a) is greater than or equal to 1.42, then the angle of the "V" - shaped structure surrounded by the two magnet groove portions 210 is small, and the distance from the magnet slot 200 to the shaft hole 100 becomes small accordingly. In this way, on the one hand, the material of the permanent magnet 90 of the motor 1 will be wasted, increasing the production cost of the motor 1. On the other hand, the magnetic concentrating ability of the motor 1 is weak, and the torque output ability of the motor 1 is weak.

[0195] If (α × d2) / (θ × a) is less than or equal to 0.76, then the angle of the "V" - shaped structure surrounded by the two magnet groove portions 210 is large, and the distance from the magnet slot 200 to the shaft hole 100 becomes large accordingly. Then, the load - bearing capacity of the permanent magnet 90 of the motor 1 will be reduced, and in this way, the torque output ability of the motor 1 will be decreased.

[0196] That is to say, when α, d2, θ, and a satisfy the above - mentioned parameter limitations, the production cost of the motor 1 and the torque output ability can be taken into account.

[0197] Optionally, (α×d2) / (θ×a) = 0.8, (α×d2) / (θ×a) = 0.9, (α×d2) / (θ×a) = 1, (α×d2) / (θ×a) = 1.1, (α×d2) / (θ×a) = 1.2, (α×d2) / (θ×a) = 1.3, (α×d2) / (θ×a) = 1.4, etc., and they are not listed one by one here.

[0198] In some embodiments, optionally, as Figure 2 and Figure 3 shown, the rotor core 10 includes a plurality of stacked rotor punching sheets 700.

[0199] The rotor punching sheet 700 is provided with a riveting buckle portion 710.

[0200] The riveting buckle portion 710 is located between the first magnetic modulation groove 310 and the third magnetic modulation groove 330 arranged adjacent to the first magnetic modulation groove 310.

[0201] In this embodiment, the structure of the rotor core 10 is further defined such that the rotor core 10 includes a plurality of rotor punching sheets 700, and the rotor punching sheet 700 is provided with a riveting buckle portion 710.

[0202] A plurality of rotor punching sheets 700 are stacked along the axial direction of the rotor core 10 to form the rotor core 10. The riveting buckle portions 710 on two adjacent rotor punching sheets 700 can cooperate with each other so that the plurality of rotor punching sheets 700 are axially connected to each other, thereby forming the rotor core 10.

[0203] It can be understood that the riveting buckle portion 710 is located between the first magnetic modulation groove 310 and the third magnetic modulation groove 330 arranged adjacent to the first magnetic modulation groove 310, that is, the riveting buckle portion 710 is located on one side of the magnetic pole center line 12, and the riveting buckle portion 710 is adjacent to the first magnetic modulation groove 310. If the riveting buckle portion 710 is too close to the magnet groove 200, for example, the riveting buckle portion 710 is arranged between the magnet groove 200 and the magnetic modulation structure 300, then, during the high-speed stamping process of the die of the rotor punching sheet 700, the magnet groove 200 will be deformed, resulting in a change in the size of the magnet groove 200, so that the size of the magnet groove 200 does not match the size of the permanent magnet 90. In this way, it will affect the process of assembling the permanent magnet 90 into the magnet groove 200. That is to say, the position setting of the riveting buckle portion 710 in the present application can ensure the riveting reliability of the rotor punching sheet 700 while improving the manufacturability, and can ensure the production efficiency and the yield rate of the product.

[0204] In some embodiments, optionally, the number of the riveting buckle portions 710 is multiple.

[0205] At least one riveting buckle portion 710 is arranged between each first magnetic modulation groove 310 and the third magnetic modulation groove 330 arranged adjacent to the first magnetic modulation groove 310.

[0206] In this embodiment, the number and distribution positions of the riveting buckles 710 are further defined.

[0207] Specifically, the number of the riveting buckles 710 is multiple, and at least one riveting buckle 710 is arranged between any one of the first magnetic tuning grooves 310 in the multiple first magnetic tuning grooves 310 and the third magnetic tuning groove 330 arranged adjacent to the first magnetic tuning groove 310. The multiple riveting buckles 710 are arranged at intervals around the shaft hole 100. This setting can ensure the balance and consistency of the forces at different positions of the rotor punching sheet 700. In this way, the overall outer dimension of the rotor core 10 can be ensured, and the safety and reliability of product use can be improved.

[0208] In some embodiments, optionally, as Figure 3 shown, the minimum distance from the magnetic tuning structure 300 to the outer peripheral wall of the rotor core 10 is greater than or equal to 0.4 mm.

[0209] In this embodiment, the matching structure between the magnetic tuning groove group and the rotor core 10 is further defined, and the distance from the magnetic tuning structure 300 to the outer peripheral wall of the rotor core 10 is denoted as k1. Among them, the minimum value of k1 is greater than or equal to 0.4 mm. This setting can ensure the manufacturability of the rotor core 10, make the strength of the rotor core 10 within a safe range, avoid deformation when the motor 1 rotates at high speed, thereby avoiding the problem of large vibration and noise caused by uneven magnetic field distribution of the motor 1 due to excessive deformation of the rotor core 10, and is beneficial to improving the structural strength of the rotor core 10.

[0210] In some embodiments, optionally, as Figure 3 shown, the minimum distance from the magnetic tuning structure 300 to the magnet groove 200 is greater than or equal to 0.4 mm.

[0211] In this embodiment, the matching structure between the magnetic tuning groove group and the magnet groove 200 is further defined, and the distance from the magnetic tuning structure 300 to the magnet groove 200 is denoted as k2. Among them, the minimum value of k2 is greater than or equal to 0.4 mm. This setting can ensure the manufacturability of the rotor core 10, make the strength of the rotor core 10 within a safe range, avoid deformation when the motor 1 rotates at high speed, thereby avoiding the problem of large vibration and noise caused by uneven magnetic field distribution of the motor 1 due to excessive deformation of the rotor core 10, and is beneficial to improving the structural strength of the rotor core 10.

[0212] In some embodiments, optionally, as Figure 1 and Figure 2 shown, the motor 1 further includes a plurality of permanent magnets 90.

[0213] At least one permanent magnet 90 is arranged in the magnet groove 200.

[0214] The permanent magnet 90 contains cerium with a mass percentage of X%.

[0215] Among them, 1% < X% < 5%.

[0216] In this embodiment, the structure of the motor 1 is further defined such that the motor 1 further includes a plurality of permanent magnets 90, and at least one permanent magnet 90 is disposed in each magnet slot 200. Among them, the permanent magnet 90 contains cerium with a mass percentage of X%. Using the permanent magnet 90 containing cerium as the magnetic pole can reduce the content of praseodymium and neodymium elements in the permanent magnet 90. In this way, the production cost of the permanent magnet 90 can be reduced, and further the production cost of the motor 1 can be reduced, solving the problem that the cost of the motor 1 is high due to the high price of rare earth materials such as praseodymium and neodymium in the related art.

[0217] By replacing the relatively expensive praseodymium and neodymium elements in the permanent magnet 90 with cerium elements that are rich in content and relatively cheap in price, the price of the permanent magnet 90 can be effectively reduced, and the cost performance of the motor 1 can be improved.

[0218] In addition, the mass ratio of cerium element in the permanent magnet 90 is greater than 1% and less than 5%. Adding cerium element to the permanent magnet 90 can reduce the cost of the permanent magnet 90, thereby reducing the cost of the motor 1. However, the addition of cerium element will reduce the intrinsic coercivity of the permanent magnet 90 and thus weaken the demagnetization resistance ability of the motor 1. When the mass ratio of cerium element is greater than 1% and less than 5%, the cost performance of the motor 1 can be improved while meeting the requirement of the demagnetization resistance ability of the motor 1.

[0219] Optionally, X% = 1.5%, X% = 2%, X% = 2.5%, X% = 3%, X% = 3.5%, X% = 4%, X% = 4.5%, etc., which are not listed one by one here.

[0220] According to a compressor of some other embodiments of the present application, it includes: the motor 1 in the above embodiment.

[0221] The compressor provided by the present application includes the motor 1 in the above embodiment, and therefore has all the beneficial effects of the above motor 1, which will not be elaborated one by one here.

[0222] According to a vehicle of some other embodiments of the present application, it includes: the motor 1 in the above embodiment; or the compressor in the above embodiment.

[0223] The vehicle provided by the present application includes the motor 1 or the compressor in the above embodiment, and therefore has all the beneficial effects of the above motor 1 or compressor, which will not be elaborated one by one here.

[0224] It should be noted 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, hydrogen engine vehicles, etc.

[0225] Optionally, the motor 1 includes a stator and a rotor. The stator includes a stator core 80 and enameled wires. The rotor includes a rotor core 10 and permanent magnets 90.

[0226] The stator core 80 includes a stator yoke 82 and a plurality of stator teeth 84. The plurality of stator teeth 84 are connected to the inner peripheral wall of the stator yoke 82. Adjacent two stator teeth 84 and the stator yoke 82 enclose a stator slot, and enameled wires are arranged in the stator slot. The enameled wires are wound around the stator teeth 84.

[0227] The rotor core 10 is provided with a shaft hole 100 and a plurality of magnet slots 200. The plurality of magnet slots 200 are arranged at intervals around the shaft hole 100. Each magnet slot 200 is provided with a permanent magnet 90.

[0228] The permanent magnet 90 contains cerium with a mass percentage of X%, where 1% < X% < 5%.

[0229] The part of the rotor core 10 between the magnet slot 200 and the outer peripheral wall of the rotor core 10 is a magnetic pole part. The magnetic pole part is provided with a magnetic field adjusting structure 300. The magnetic field adjusting structure 300 includes a first magnetic field adjusting slot 310, a plurality of second magnetic field adjusting slots 320, and a plurality of third magnetic field adjusting slots 330.

[0230] In the magnet slot 200, an included angle α is formed between the end faces of two magnet slot parts 210 segments facing the outer peripheral wall of the rotor core 10. An included angle θ is formed between the end faces of the second magnetic field adjusting slot 320 adjacent to the first magnetic field adjusting slot 310 and the first magnetic field adjusting slot 310 that are close to each other. Along the circumferential direction of the rotor core 10, the distance between adjacent two second magnetic field adjusting slots 320 is denoted as d1. The magnet slot part 210 has a first slot wall 216 and a second slot wall 218 that are opposite and spaced apart. The first slot wall 216 is located between the second slot wall 218 and the magnetic field adjusting structure 300. The distance from the first slot wall 216 to the second slot wall 218 is denoted as d2. Among them, 2×θ×d1 / d2 < α.

[0231] The first magnetic field adjusting slot 310 is arranged on the magnetic pole center line 12 of the rotor core 10. The length of the first magnetic field adjusting slot 310 is not greater than that of the adjacent second magnetic field adjusting slot 320, and the length of the first magnetic field adjusting slot 310 is not greater than that of the adjacent third magnetic field adjusting slot 330. It can adjust the direction of the magnetic force lines of the motor 1, reduce magnetic leakage, improve the rotor strength, and is beneficial to improving the reliability of the motor 1 during high-speed operation.

[0232] A plurality of second magnetic field adjusting slots 320 are placed in parallel on one side of the first magnetic field adjusting slot 310, and a plurality of third magnetic field adjusting slots 330 are placed in parallel on the other side of the first magnetic field adjusting slot 310. Each second magnetic field adjusting slot 320 and a third magnetic field adjusting slot 330 are symmetrically arranged with respect to the magnetic pole center line 12 of the rotor core 10 as the axis of symmetry. It can adjust the magnetic field distribution, improve the symmetry and sinusoidality of the magnetic field of the motor 1, and reduce magnetic leakage.

[0233] The magnetic pole portion of the rotor core 10 is provided with a riveting portion 710. The portion of the rotor core 10 between the magnet slots 200 and the outer peripheral wall of the rotor core 10 is the magnetic pole portion. The riveting portion 710 is arranged on one side of the magnetic pole center line 12. The riveting portion 710 is adjacent to the first magnetic field adjusting slot 310.

[0234] The width of the stator yoke 82 of the stator core 80 is denoted as d3, and d3 satisfies 5mm ≤ d3 ≤ 7mm.

[0235] The minimum distance between the magnetic field adjusting structure 300 and the outer peripheral wall of the rotor core 10 is not less than 0.4mm, and the minimum distance between the magnetic field adjusting structure 300 and the magnet slots 200 is not less than 0.4mm.

[0236] The structure of the motor 1 (such as, the permanent magnet motor 1) is reasonably set in this application, which can weaken the back electromotive force harmonics of the motor 1, reduce the distortion rate of the back electromotive force of the motor 1, is beneficial to reducing the torque ripple of the motor 1, and thus reduces the vibration and noise of the motor 1.

[0237] The permanent magnet 90 contains cerium with a mass percentage of X%, where 1% < X% < 5%. Adding cerium element to the permanent magnet 90 can reduce the use of rare earth materials with higher prices, thereby reducing the cost of the motor 1. However, the addition of cerium element will reduce the intrinsic coercive force of the permanent magnet 90, thereby weakening the demagnetization resistance ability of the motor 1. When the mass ratio of cerium element is greater than 1% and less than 5%, the performance - price ratio of the motor 1 can be improved while meeting the requirements of the demagnetization resistance ability of the motor 1.

[0238] Along the rotor core 10 to the stator core 80, the width of the stator yoke 82 is denoted as d3. d3 satisfies 5mm ≤ d3 ≤ 7mm. If the width of the stator yoke 82 is too small, the magnetic field of the stator yoke 82 is prone to saturation, the motor 1 generates serious heat under heavy load, and the too - small width of the stator yoke 82 will make the stiffness of the stator core 80 poor, easily deteriorating the vibration and noise of the motor 1. If the width of the stator yoke 82 is too large, the area of the stator slots of the stator core 80 will be correspondingly reduced, reducing the efficiency and load - carrying capacity of the motor 1.

[0239] The minimum distance between the magnetic field adjusting structure 300 and the outer peripheral wall of the rotor core 10 is not less than 0.4mm. The minimum distance between the magnetic field adjusting structure 300 and the magnet slots 200 is not less than 0.4mm. It can ensure the manufacturability of the rotor core 10, keep the strength of the rotor core 10 within a safe range, avoid deformation of the motor 1 during high - speed rotation, and thus avoid the situation that the magnetic field distribution of the motor 1 becomes uneven due to excessive deformation of the rotor core 10, which is beneficial to improving the structural strength of the rotor.

[0240] Taking the 12 - slot 8 - pole motor 1 as an example. Such as Figure 4As shown, compared with the motor in the related art (the motor in the related art is not provided with a field weakening structure), the radial electromagnetic force of the motor 1 of the present application is significantly reduced at different spatial orders. Since the smaller the spatial order corresponding to the radial electromagnetic force, the greater the impact on vibration and noise, therefore, the numerical values of the 4th and 8th order radial electromagnetic forces are mainly concerned. From Figure 4 it can be seen that according to the solution of the present application, compared with the radial electromagnetic force in the 4th and 8th order spaces in the related art, it is reduced by 12.3% and 7.3% respectively, which is beneficial to improving the vibration and noise of the motor 1.

[0241] As Figure 5 shown, compared with the motor in the related art (the motor in the related art is not provided with a field weakening structure), under the same load condition, the peak-to-peak value of the torque ripple of the motor 1 of the present application is reduced by 36.6%, which can significantly reduce the vibration and noise of the motor 1.

[0242] As Figure 6 shown, the 7th and 11th harmonics of the back electromotive force of the present application are significantly reduced, which is beneficial to reducing the torque ripple and the vibration and noise of the motor 1.

[0243] As Figure 7 shown, α, θ, d1 and d3 satisfy: 30 / d3 < α / (θ × d1) < 36 / d3. Specifically, taking d3 = 6 mm as an example, the distortion rate of the back electromotive force of the motor 1 is lower than that of the motor in the related art, and the waveform distortion rate of the back electromotive force of the motor 1 of the present application is at a low level, and the sinusoidality of the back electromotive force is better, which is beneficial to improving the vibration and noise.

[0244] In summary, the motor 1 of the present application can weaken the radial electromagnetic force and torque ripple of the motor 1, and significantly reduce the vibration and noise of the motor 1.

[0245] Specifically, the motor 1 includes a rotor core 10. The rotor core 10 is provided with a shaft hole 100, a plurality of magnet slots 200 and a plurality of field weakening structures 300. The magnet slots 200 are located between the shaft hole 100 and the outer peripheral wall of the rotor core 10, and the plurality of magnet slots 200 are arranged at intervals around the shaft hole 100.

[0246] There is at least one field weakening structure 300 between the magnet slot 200 and the outer peripheral wall of the rotor core 10. For example, there is at least one field weakening structure 300 between any one of the plurality of magnet slots 200 and the outer peripheral wall of the rotor core 10, that is, there is at least one field weakening structure 300 between each magnet slot 200 and the outer peripheral wall of the rotor core 10. Another example is that in a part of the plurality of magnet slots 200, there is at least one field weakening structure 300 between the magnet slot 200 and the outer peripheral wall of the rotor core 10, that is, only part of the magnet slots 200 and the outer peripheral wall of the rotor core 10 are provided with at least one field weakening structure 300.

[0247] Further define the mating structure of the shaft hole 100, the plurality of magnet slots 200 and the plurality of magnetic field adjusting structures 300.

[0248] The magnet slot 200 includes two magnetic slot portions 210. Any one of the two magnetic slot portions 210 includes an inner end 212 and an outer end 214. The inner end 212 of the magnetic slot portion 210 is disposed close to the shaft hole 100, and the outer end 214 of the magnetic slot portion 210 is disposed away from the shaft hole 100. Moreover, in the magnet slot 200, the inner ends 212 of the two magnetic slot portions 210 are connected to each other, and the outer ends 214 of the two magnetic slot portions 210 are away from each other. That is, the two magnetic slot portions 210 in the magnet slot 200 are arranged in a "V" shape.

[0249] In the magnet slot 200, the end surface of the magnetic slot portion 210 facing the outer peripheral wall of the rotor core 10 is denoted as the reference surface. In the magnet slot 200, an included angle α is formed between the two reference surfaces of the two magnetic slot portions 210.

[0250] The magnetic field adjusting structure 300 includes a first magnetic field adjusting slot 310, a plurality of second magnetic field adjusting slots 320 and a plurality of third magnetic field adjusting slots 330. Along the circumferential direction of the rotor core 10, the first magnetic field adjusting slot 310 has a circumferential first side and a circumferential second side. The plurality of second magnetic field adjusting slots 320 are located on the circumferential first side of the first magnetic field adjusting slot 310, and the plurality of second magnetic field adjusting slots 320 are arranged at intervals along the circumferential direction of the rotor core 10. The plurality of third magnetic field adjusting slots 330 are located on the circumferential second side of the first magnetic field adjusting slot 310, and the plurality of third magnetic field adjusting slots 330 are arranged at intervals along the circumferential direction of the rotor core 10. It can be understood that the plurality means a number greater than or equal to 2. Among them, an included angle θ is formed between the second second magnetic field adjusting slot 320 adjacent to the first magnetic field adjusting slot 310 and the end surface of the first magnetic field adjusting slot 310 close to each other. Along the circumferential direction of the rotor core 10, the distance between two adjacent second magnetic field adjusting slots 320 is denoted as d1. As Figure 2 [[ID=1 + 1]]shown, along the circumferential direction of the rotor core 10, the distance between the first second magnetic field adjusting slot 320 adjacent to the first magnetic field adjusting slot 310 and the second second magnetic field adjusting slot 320 is denoted as d1. The magnetic slot portion 210 has a first slot wall 216 and a second slot wall 218 which are opposite and spaced apart. The first slot wall 216 is located between the second slot wall 218 and the magnetic field adjusting structure 300, and the distance from the first slot wall 216 to the second slot wall 218 is denoted as d2.

[0251] And define the relationship of α, θ, d1 and d2 to satisfy 2×θ×d1 / d2 < α. This setting adjusts the direction of the magnetic force lines of the motor 1, can weaken the back electromotive force harmonics of the motor 1, and further can reduce the back electromotive force distortion rate of the motor 1. In this way, it is beneficial to reduce the torque ripple of the motor 1, and thus can reduce the vibration noise of the motor 1.

[0252] It can be understood that the electromagnetic vibration noise level of the motor 1 is related to the radial electromagnetic force level and the torque ripple.

[0253] The radial electromagnetic force of the motor 1 is an important indicator reflecting the vibration and noise level of the motor 1, and the magnitude of the radial electromagnetic force changes with space and time. In this application, by making α, θ, d1, and d2 satisfy 2×θ×d1 / d2 < α, the radial electromagnetic force of the motor 1 is significantly reduced in the space order, which is beneficial to improving the vibration and noise of the motor 1. At the same time, under the same load condition, the peak-to-peak value of the torque ripple of the motor 1 is also reduced, thereby further reducing the vibration and noise of the motor 1. In addition, this setting can also reduce the distortion rate of the back electromotive force of the motor 1, making the back electromotive force have better sinusoidality, and the output torque of the motor 1 during load operation is smoother. In this way, the harmonics of the motor 1 can be weakened, and thus the vibration and noise of the motor 1 can be reduced.

[0254] In this application, the term "a plurality" means two or more, unless otherwise clearly defined. Terms such as "mounted", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0255] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. The above is only the preferred embodiment of this application and is not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A motor, characterized in that, Comprising: A rotor core, the rotor core being provided with a shaft hole, a plurality of magnet slots and a plurality of magnetic flux adjusting structures. The plurality of magnet slots are arranged at intervals around the shaft hole, and at least one of the magnetic flux adjusting structures is provided between the magnet slot and the outer peripheral wall of the rotor core; The magnet slot includes two magnet slot portions. The magnet slot portion includes an inner end close to the shaft hole and an outer end far from the shaft hole. The inner ends of the two magnet slot portions are connected to each other, and the outer ends of the two magnet slot portions are away from each other. In the magnet slot, the end faces of the two magnet slot portions facing the outer peripheral wall of the rotor core form an included angle α; The magnetic flux adjusting structure includes: A first magnetic flux adjusting slot; A plurality of second magnetic flux adjusting slots, the plurality of second magnetic flux adjusting slots being located on the first circumferential side of the first magnetic flux adjusting slot, and the plurality of second magnetic flux adjusting slots being arranged at intervals in the circumferential direction of the rotor core; A plurality of third magnetic flux adjusting slots, the plurality of third magnetic flux adjusting slots being located on the second circumferential side of the first magnetic flux adjusting slot, and the plurality of third magnetic flux adjusting slots being arranged at intervals in the circumferential direction of the rotor core; An included angle θ is formed between the end face of the second second magnetic flux adjusting slot adjacent to the first magnetic flux adjusting slot and the end face of the first magnetic flux adjusting slot that are close to each other; Along the circumferential direction of the rotor core, the distance between two adjacent second magnetic flux adjusting slots is denoted as d1; The magnet slot portion has a first slot wall and a second slot wall that are opposite and spaced apart. The first slot wall is located between the second slot wall and the magnetic flux adjusting structure, and the distance from the first slot wall to the second slot wall is denoted as d2; Wherein, 2×θ×d1 / d2 < α.

2. The motor according to claim 1, wherein Further comprising: A stator core, the stator core including a stator yoke and a plurality of stator teeth. The plurality of stator teeth are connected to the inner peripheral wall of the stator yoke, and the plurality of stator teeth are arranged at intervals in the circumferential direction of the stator yoke. The stator teeth surround the circumferential side of the rotor core. Along the rotor core to the stator core, the width of the stator yoke is denoted as d3; Wherein, α, θ, d1 and d3 satisfy: 30 / d3 < α / (θ×d1) < 36 / d3.

3. The motor according to claim 2, wherein, d3 satisfies: 5 mm ≤ d3 ≤ 7 mm.

4. The electric machine according to any one of claims 1 to 3, characterized in that The rotor core includes a plurality of stacked rotor punching sheets, and the rotor punching sheet is provided with a riveting portion, and the riveting portion is located between the first magnetic flux adjusting slot and the third magnetic flux adjusting slot adjacent to the first magnetic flux adjusting slot.

5. The motor according to claim 4, characterized in that, The number of the riveting portions is multiple, and at least one of the riveting portions is provided between each first magnetic flux adjusting slot and the third magnetic flux adjusting slot adjacent to the first magnetic flux adjusting slot.

6. The electric machine according to any one of claims 1 to 3, characterized in that, The first magnetic flux adjusting slot is located on the magnetic pole center line of the rotor core.

7. The motor according to claim 6, characterized in that, Along the magnet slot to the outer peripheral wall of the rotor core, the length of the first magnetic flux adjusting slot is denoted as l1, the length of the second magnetic flux adjusting slot adjacent to the first magnetic flux adjusting slot is denoted as l2, and the length of the third magnetic flux adjusting slot adjacent to the first magnetic flux adjusting slot is denoted as l3; Wherein, l1 ≤ l2, l1 ≤ l3.

8. The electric machine according to any one of claims 1 to 3, characterized in that, The plurality of second magnetic flux adjusting slots are arranged in parallel, and each second magnetic flux adjusting slot and a third magnetic flux adjusting slot are symmetrically arranged with respect to the magnetic pole center line of the rotor core.

9. The motor according to claim 8, characterized in that, The part of the outer peripheral wall of the rotor core opposite to the magnet slot includes two arc segment groups, and the two arc segment groups are symmetrically arranged with respect to the magnetic pole center line of the rotor core. Each arc segment group includes a first arc segment, a second arc segment, and a third arc segment arranged along the circumferential direction of the rotor core. The first arc segment is arranged adjacent to the magnetic pole center line of the rotor core, and the second arc segment is located between the first arc segment and the third arc segment; Along the circumferential direction of the rotor core, the part of the rotor core between the ends of two adjacent magnet slots is denoted as the inter-pole part, and the part of the outer peripheral wall of the rotor core opposite to the inter-pole part is the fourth arc segment; The center of the circle corresponding to any one of the first arc segment and the fourth arc segment coincides with the center of the shaft hole, and the radius corresponding to the fourth arc segment is smaller than the radius corresponding to the first arc segment; The center of the circle corresponding to any one of the second arc segment and the third arc segment is located on the magnetic pole center line of the rotor core; The minimum distance from the side of the magnet slot facing away from the shaft hole to the center of the shaft hole is denoted as a, the distance from the center of the circle corresponding to the second arc segment to the center of the shaft hole is denoted as b, the distance from the center of the circle corresponding to the third arc segment to the center of the shaft hole is denoted as c, the radius corresponding to the first arc segment is denoted as R1, and the radius corresponding to the fourth arc segment is denoted as R2. Wherein, 2×(b + c)×(R1 - R2) < a×d2.

10. The motor according to claim 9, characterized in that, a, b, c, R1, and R2 satisfy: 0.05 < (b + c)×(R1 - R2) / (a×d2) < 0.

5.

11. The motor according to claim 9, characterized in that, α, d2, θ, and a satisfy: 0.76 < (α×d2) / (θ×a) < 1.

42.

12. The electric machine according to any one of claims 1 to 3, characterized in that The minimum distance from the magnetic field modulation structure to the outer peripheral wall of the rotor core is greater than or equal to 0.4 mm; The minimum distance from the magnetic field modulation structure to the magnet slot is greater than or equal to 0.4 mm.

13. The motor according to any one of claims 1 to 3, characterized in that Further comprising: A plurality of permanent magnets, at least one of the permanent magnets is disposed in the magnet slot, and the permanent magnet contains cerium with a mass percentage of X%, wherein, 1% < X% < 5%.

14. A compressor, characterized in that, Comprising: The motor according to any one of claims 1 to 13.

15. A vehicle, characterized in that, Comprising: The motor according to any one of claims 1 to 13; Or The compressor according to claim 14.

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