Stator core, stator, motor, compressor and vehicle

Abstract

The invention provides a stator core, a stator, a motor, a compressor and a vehicle. The stator core comprises a first punching sheet group and a second punching sheet group, the second punching sheet group is stacked on one side of the first punching sheet group along the axial direction of the stator iron core, and the second punching sheet group is closer to the end part of the stator iron core than the first punching sheet group; any one of the first punching sheet group and the second punching sheet group comprises an annular yoke part and a plurality of tooth parts, each tooth part is connected to the inner circumferential wall of the annular yoke part, the plurality of tooth parts are arranged at intervals around the axis of the stator core, and a stator slot is defined by two adjacent tooth parts and the annular yoke part; along the circumferential direction of the stator core, the notch width of the stator slots of the first punching sheet group is marked as d1, the notch width of the stator slots of the second punching sheet group is marked as d2, and 1 < d2 / d1 < 3.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a stator core, a stator, a motor, a compressor and a vehicle. Background Art

[0002] Permanent magnet synchronous motors are widely used in air conditioning compressors and other fields due to their high efficiency. In the related art, the stator core of the permanent magnet synchronous motor includes a plurality of punchings, and the slot widths of any two punchings in the circumferential direction of the stator core are equal, which results in a large armature reaction of the motor. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, a first aspect of the present application provides a stator core.

[0005] A second aspect of the present application provides a stator.

[0006] A third aspect of the present application provides an electric motor.

[0007] A fourth aspect of the present application provides a compressor.

[0008] A fifth aspect of the present application provides a vehicle.

[0009] In view of this, the first aspect of the present application proposes a stator core, comprising: a first punching sheet group; a second punching sheet group, wherein the second punching sheet group is stacked on one side of the first punching sheet group along the axial direction of the stator core, and the second punching sheet group is closer to the end of the stator core than the first punching sheet group; either the first punching sheet group or the second punching sheet group comprises an annular yoke and a plurality of tooth portions, each tooth portion is connected to the inner circumferential wall of the annular yoke, and the plurality of tooth portions are arranged at intervals around the axis of the stator core, and two adjacent tooth portions and the annular yoke enclose a stator slot; along the circumferential direction of the stator core, the slot width of the stator slot of the first punching sheet group is recorded as d1, and the slot width of the stator slot of the second punching sheet group is recorded as d2, wherein 1<d2 / d1<3.

[0010] The present application provides a stator core including a first punching sheet group and a second punching sheet group.

[0011] The first punching sheet group and the second punching sheet group are arranged along the axial direction of the stator core. Specifically, along the axial direction of the stator core, the second punching sheet group is stacked on one side of the first punching sheet group.

[0012] The first punching sheet group includes an annular yoke and multiple teeth. Any one of the multiple teeth is connected to the inner circumferential wall of the annular yoke. The multiple teeth are arranged at intervals around the axis of the stator core. Two adjacent teeth and the annular yoke enclose a stator slot.

[0013] The second punching sheet group includes an annular yoke and multiple teeth. Any one of the multiple teeth is connected to the inner circumferential wall of the annular yoke. The multiple teeth are arranged at intervals around the axis of the stator core. Two adjacent teeth and the annular yoke enclose a stator slot.

[0014] The structures of the first punching sheet group and the second punching sheet group are defined so that the width of the stator slot openings of the first punching sheet group in the circumferential direction of the stator core is recorded as d1, and the width of the stator slot openings of the second punching sheet group in the circumferential direction of the stator core is recorded as d2, and the relationship between d1 and d2 is defined so as to satisfy: 1<d2 / d1<3.

[0015] It is understandable that, when the load is symmetrical, the effect of the armature magnetomotive force on the fundamental wave of the main pole magnetic field is the armature reaction. The armature reaction will affect the performance of the motor. The present application reasonably sets the structure of the stator core so that the first punching sheet group and the second punching sheet group are set with different slot widths in the circumferential direction of the stator core. In this way, the armature reaction of the motor can be improved, the voltage of the armature reaction of the motor can be reduced, and the torque output of the motor under high-speed conditions can be improved.

[0016] If d2 / d1 is less than or equal to 1, the difference between the slot width of the first punching sheet group in the circumferential direction of the stator core and the slot width of the second punching sheet group in the circumferential direction of the stator core is small, that is, the slot width of the first punching sheet group in the circumferential direction of the stator core is closer to the slot width of the second punching sheet group in the circumferential direction of the stator core. In this way, the effect of alleviating the armature reaction is poor, and the effect of improving the torque output of the motor under high-speed conditions is poor.

[0017] If d2 / d1 is greater than or equal to 3, the width of the stator slot of the second punching sheet group in the circumferential direction of the stator core is too large, so that the winding wound on the teeth of the first punching sheet group and the second punching sheet group cannot be effectively blocked, and the winding is easily separated from the teeth, and the stability and reliability of the electronic movement cannot be guaranteed. In addition, this setting will increase the gap between the stator and rotor of the motor, which will affect the power density of the motor and the torque output of the motor.

[0018] In addition, the second punching sheet group is closer to the end of the stator core than the first punching sheet group, that is, the distance from the second punching sheet group to the end of the stator core is smaller than the distance from the first punching sheet group to the end of the stator core, and the width d1 of the stator slot of the first punching sheet group in the circumferential direction of the stator core and the width d2 of the stator slot of the second punching sheet group in the circumferential direction of the stator core satisfy 1<d2 / d1<3. In other words, along the circumference of the stator core, the punching sheet group with a smaller slot width is closer to the middle of the stator core. In this way, the problem of the stator slot insulation protruding from the inner diameter of the stator core can be effectively prevented, and the reliability of the motor can be improved.

[0019] In some embodiments, optionally, d1 and d2 satisfy: 1.5<d2 / d1<3.

[0020] In this embodiment, the matching structure of the first punching sheet group and the second punching sheet group is further defined so that the width d1 of the stator slot of the first punching sheet group in the circumferential direction of the stator core and the width d2 of the stator slot of the second punching sheet group in the circumferential direction of the stator core satisfy: 1.5<d2 / d1<3, that is, the armature reaction of the motor can be improved, the voltage of the armature reaction of the motor can be reduced, and the torque output of the motor under high-speed conditions can be improved.

[0021] In some embodiments, optionally, the number of first punching sheet groups is recorded as m, the number of second punching sheet groups is recorded as n, and a first punching sheet group is arranged between any two adjacent second punching sheet groups; wherein m≥1, n≥2.

[0022] In this embodiment, the structures of the first punching sheet group and the second punching sheet group are further defined, so that the number of the first punching sheet group is recorded as m, the number of the second punching sheet group is recorded as n, m≥1, n≥2. It is also defined that a first punching sheet group is provided between any two adjacent second punching sheet groups. That is, the axial end surface of each first punching sheet group is provided with a second punching sheet group.

[0023] This arrangement can meet the use requirements of setting different slot widths of the first punching sheet group and the second punching sheet group in the circumferential direction of the stator core, and make the number of the first punching sheet group smaller than the number of the second punching sheet group. In this way, the slot insulation of the stator can be effectively prevented from protruding from the inner diameter of the stator core, which can improve the reliability of the motor and help reduce the material input of the stator core, thereby helping to reduce the weight of the stator core and reduce the production cost of the stator core.

[0024] It is understandable that if the slot width of the punching sheet group in the circumferential direction of the stator core is small, the magnetic flux leakage will increase significantly, thus reducing the output torque of the motor. Therefore, the number of the first punching sheet group is smaller than the number of the second punching sheet group, so as to take into account the magnetic flux leakage of the motor and prevent the stator slot insulation from protruding from the inner diameter of the stator core, which is conducive to improving the safety and reliability of the motor.

[0025] In some embodiments, optionally, the axial height of the first punching sheet group is recorded as h1, and the axial height of the second punching sheet group is recorded as h2, wherein 0.05<(m×h1) / (n×h2)<0.2.

[0026] In this embodiment, the structures of the first and second punching sheet groups are further defined, so that along the axial direction of the stator core, the height of the first punching sheet group is recorded as h1, and the height of the second punching sheet group is recorded as h2, and the relationship between h1 and h2 is defined to satisfy: 0.05<(m×h1) / (n×h2)<0.2. In other words, the relationship between the sum of the axial heights of all the first punching sheet groups included in the stator core and the sum of the axial heights of all the second punching sheet groups included in the stator core is defined. Because reducing the slot width of the second punching sheet group in the circumferential direction of the stator core will increase the risk of stator leakage, therefore, by defining the optimal ratio of the axial heights of the first and second punching sheet groups, the risk of leakage can be minimized, that is, the leakage can be reduced while ensuring the performance of the motor.

[0027] In some embodiments, optionally, the stator core further includes: a third punching sheet group, the second punching sheet group is located between the first punching sheet group and the third punching sheet group; the third punching sheet group includes an annular yoke and a plurality of teeth, and along the circumference of the stator core, the slot width of the stator slot of the third punching sheet group is recorded as d3, wherein d3>d2>d1.

[0028] In this embodiment, the structure of the stator core is further defined so that the stator core also includes a third punching sheet group. Along the axial direction of the stator core, the second punching sheet group is located between the first punching sheet group and the third punching sheet group. In other words, the third punching sheet group is located at the end of the stator core.

[0029] The third punching sheet group includes an annular yoke and multiple teeth. Any one of the multiple teeth is connected to the inner circumferential wall of the annular yoke. The multiple teeth are arranged at intervals around the axis of the stator core. Any two adjacent teeth and the annular yoke enclose a stator slot.

[0030] The structures of the first punching sheet group, the second punching sheet group and the third punching sheet group are defined, so that the width of the notch of the stator slot of the first punching sheet group in the circumferential direction of the stator core is recorded as d1, the width of the notch of the stator slot of the second punching sheet group in the circumferential direction of the stator core is recorded as d2, and the width of the notch of the stator slot of the third punching sheet group in the circumferential direction of the stator core is recorded as d3, and the relationship between d1, d2 and d3 is defined so as to satisfy: d3>d2>d1. That is to say, along the axial direction of the stator core, the notch width of the first punching sheet group, the second punching sheet group and the third punching sheet group in the circumferential direction of the stator core gradually increases, and this setting can reduce magnetic leakage and improve the output torque of the motor. In other words, the first punching sheet group, the second punching sheet group and the third punching sheet group are set with different notch widths in the circumferential direction of the stator core, so that the armature reaction of the motor can be improved, the voltage of the armature reaction of the motor can be reduced, and the torque output of the motor under high-speed conditions can be improved.

[0031] It can be understood that the first punching sheet group with a smaller slot width in the circumferential direction of the stator core is located in the middle of the stator core, and the third punching sheet group with a larger slot width in the circumferential direction of the stator core is located at the end of the stator core. In this way, the problem of the stator slot insulation protruding from the inner diameter of the stator core can be effectively prevented, thereby improving the reliability of the motor.

[0032] In other words, this arrangement takes into account both the leakage flux of the motor and the blocking of the stator slot insulation from protruding from the inner diameter of the stator core, which is beneficial to improving the safety and reliability of the motor.

[0033] In some embodiments, optionally, along the axial direction of the stator core, the orthographic projection of the slot wall of the stator slot of the third punching sheet group on the second punching sheet group is located outside the slot wall of the stator slot of the second punching sheet group.

[0034] In this embodiment, the structures of the second and third punching sheet groups are further defined, and along the axial direction of the stator core, the slot walls of the stator slots of the third punching sheet group are located outside the slot walls of the stator slots of the second punching sheet group as the orthographic projection. The cross-sectional area of ​​the stator slots of the third punching sheet group is greater than the cross-sectional area of ​​the stator slots of the second punching sheet group. That is, the slot walls of the stator slots of the third punching sheet group and the second punching sheet group enclose a sink, that is, at least a portion of the slot walls of the stator slots of the third punching sheet group and the slot walls of the stator slots of the second punching sheet group form a stepped structure.

[0035] Specifically, the stator also includes an insulating bracket. When the stator core is connected with the insulating bracket, an insulating protrusion is provided on the insulating bracket. The insulating protrusion abuts against the sink groove, and the insulating protrusion can be covered at the edge of the stator slot of the third punching sheet group. In this way, on the basis of ensuring the performance of the motor, the height of the stator can be reduced along the axial direction of the stator core, which is conducive to reducing the occupancy rate of the stator to the internal space of the motor, and is conducive to reducing the volume of the motor and reducing the weight of the motor.

[0036] Moreover, this arrangement is conducive to increasing the matching area and matching angle between the insulating bracket and the stator core, and is conducive to improving the stability and reliability of the matching between the insulating bracket and the stator core.

[0037] In addition, this arrangement can shorten the length of each turn of the winding, reduce the amount of winding used, and reduce the production cost of the product.

[0038] In some embodiments, optionally, the wall surface of the tooth portion facing the axis of the stator core is the tooth surface; the tooth surface of at least one of the first punching sheet group, the second punching sheet group and the third punching sheet group includes an arc segment and a connecting segment, the connecting segment is connected to one side of the arc segment in the circumferential direction of the stator core, and the arc segment is closer to the axis of the stator core than the connecting segment.

[0039] In this embodiment, the wall surface of the tooth portion facing the axis of the stator core is the tooth surface.

[0040] The structures of the first punching sheet group, the second punching sheet group and the third punching sheet group are further defined.

[0041] Specifically, the tooth surface of the first punching sheet group includes an arc segment and a connecting segment, or the tooth surface of the second punching sheet group includes an arc segment and a connecting segment, or the tooth surface of the third punching sheet group includes an arc segment and a connecting segment, or the tooth surface of the first punching sheet group and the tooth surface of the second punching sheet group both include an arc segment and a connecting segment, or the tooth surface of the first punching sheet group and the tooth surface of the third punching sheet group both include an arc segment and a connecting segment, or the tooth surface of the second punching sheet group and the tooth surface of the third punching sheet group both include an arc segment and a connecting segment, or any one of the tooth surface of the first punching sheet group, the tooth surface of the second punching sheet group and the tooth surface of the third punching sheet group includes an arc segment and a connecting segment.

[0042] The connecting section is connected to one side of the circular arc section, and the connecting section and the circular arc section are arranged along the circumference of the stator core. The circular arc section is closer to the axis of the stator core than the connecting section, that is, the distance from the circular arc section to the circumference of the stator core is smaller than the distance from the connecting section to the axis of the stator core.

[0043] This arrangement realizes the chamfering of the tooth tops of the teeth of the stator core, which is beneficial to improving the distribution of the air gap synthetic magnetic field of the motor, can alleviate the armature reaction, and can enhance the torque output of the motor under high-speed conditions.

[0044] In some embodiments, optionally, the connecting segment includes any one of the following or a combination thereof: a plane segment, a folded surface segment, and a curved surface segment.

[0045] In this embodiment, the structure of the connecting segment is further defined so that the connecting segment includes any one of the following or a combination thereof: a plane segment, a folded surface segment, and a curved surface segment.

[0046] For example, the connecting segment includes a plane segment. For example, the connecting segment includes a folded surface segment. For example, the connecting segment includes a curved surface segment. For example, the connecting segment includes a plane segment and a folded surface segment. For example, the connecting segment includes a plane segment and a curved surface segment. For example, the connecting segment includes a folded surface segment and a curved surface segment. For example, the connecting segment includes a plane segment, a folded surface segment and a curved surface segment.

[0047] This arrangement can meet the use requirement that the distance from the connecting segment to the axis of the stator core is greater than the distance from the arc segment to the axis of the stator core, and can improve the armature reaction.

[0048] In some embodiments, optionally, the distance from the axis of the stator core to the end face of the tooth portion facing away from the annular yoke is recorded as D1, and the distance from the axis of the stator core to the outer peripheral wall of the annular yoke is recorded as D2, wherein 0.6≤D1 / D2≤0.7.

[0049] In this embodiment, the structure of the stator core is further defined, so that the distance from the axis of the stator core to the end surface of the tooth portion away from the annular yoke portion is recorded as D1, and the distance from the axis of the stator core to the outer peripheral wall of the annular yoke portion is recorded as D2, that is, the inner diameter of the stator core is recorded as D1, and the outer diameter of the stator core is recorded as D2. And D1 and D2 satisfy 0.6≤D1 / D2≤0.7.

[0050] This setting limits the matching dimensions of the inner diameter and outer diameter of the stator core. By optimizing the split ratio of the motor, the main magnetic field provided by the permanent magnet of the motor can be increased. Under the condition of the same back electromotive force, the number of turns of the stator winding can be reduced, the anti-demagnetization ability of the motor can be improved, and the safety and reliability of the motor can be further ensured.

[0051] When the inner diameter of the stator core is increased, the outer diameter of the stator core is also increased, so that the amount of magnets used can be increased and the power density of the motor can be improved.

[0052] If D1 / D2 is greater than 0.7, the area of ​​the stator slots of the stator will be reduced, causing the stator teeth and yoke magnetic flux to be saturated, and the armature magnetic flux to be sharply reduced, resulting in deterioration of the output power of the motor.

[0053] Specifically, when the ratio of D1 to D2 is within the above range, the efficiency of the motor is higher and the copper loss of the motor is lower, that is, the efficiency, copper loss and iron loss of the motor are taken into consideration.

[0054] A second aspect of the present application proposes a stator, comprising: a stator core as in any technical solution of the first aspect.

[0055] The stator provided in the present application includes a stator core as in any technical solution in the first aspect, and therefore has all the beneficial effects of the above-mentioned stator core, which will not be described one by one here.

[0056] The third aspect of the present application provides a motor, comprising: a stator as in the second aspect, wherein a plurality of teeth of a stator core enclose an assembly cavity; and a rotor, which is rotatably disposed in the assembly cavity.

[0057] The motor provided in the present application includes a stator and a rotor, wherein a plurality of teeth of the stator core enclose an assembly cavity, and the rotor is rotatably disposed in the assembly cavity. The motor of the present application includes the stator as in the second aspect, and therefore has all the beneficial effects of the above-mentioned stator, which will not be described one by one here.

[0058] In the above technical solution, further, the rotor includes: a rotor core, arranged in the assembly cavity; an axial hole, arranged in the rotor core; a plurality of magnet slot groups, arranged in the rotor core, and the plurality of magnet slot groups are arranged at intervals around the axial hole; a plurality of slit groups, arranged in the rotor core, a slit group is arranged between each magnet slot group and the outer peripheral wall of the rotor core, and the slit group includes an odd number of slits.

[0059] In this embodiment, the structure of the rotor is further defined, and the rotor includes a rotor core, a shaft hole, a plurality of magnet slot groups, and a plurality of slot groups.

[0060] A plurality of magnet slot groups are provided on the rotor core, and the plurality of magnet slot groups are arranged at intervals around the shaft hole.

[0061] A plurality of slot groups are provided on the rotor core, and the plurality of slot groups are arranged at intervals around the shaft hole.

[0062] A slot group is arranged between each magnet slot group and the outer peripheral wall of the rotor core.

[0063] The slit group includes an odd number of slits.

[0064] The motor is applied to a compressor. Since the compressor is a pulsating load, the structure of the rotor is reasonably set so that the slot group on the rotor core includes an odd number of slots.

[0065] In this way, the radial force density of the motor can be effectively improved, the noise and vibration level of the motor can be improved, and then the noise and vibration of the compressor can be improved.

[0066] In some embodiments, optionally, the rotor also includes a plurality of permanent magnets, each magnet slot group is provided with a permanent magnet, and the permanent magnet contains X% cerium by mass; the stator also includes a winding and a plurality of stator teeth, and the winding is wound on the plurality of stator teeth; the weight of the plurality of permanent magnets is denoted as Mp, the weight of the winding is denoted as Mc, the back electromotive force value of the motor at a speed of 1000 rpm is denoted as Ke, and the maximum allowable operating voltage of the power device of the controller of the motor is denoted as Ub, wherein, (Mp / Mc)×Ub×X%≤Ke.

[0067] In this embodiment, the stator includes a stator core and a winding, the stator core includes a plurality of stator teeth, and the winding is wound on the plurality of stator teeth.

[0068] The weight of the multiple permanent magnets is recorded as Mp, the weight of the winding is recorded as Mc, the back electromotive force value of the motor at a speed of 1000 rpm is recorded as Ke, and the maximum allowable operating voltage of the power device of the motor controller is recorded as Ub.

[0069] Among them, using permanent magnets containing cerium as magnetic poles can reduce the content of praseodymium and neodymium elements in the permanent magnets, so that the production cost of the permanent magnets can be reduced, and then the production cost of the motor can be reduced, solving the problem of high cost of motors caused by the high prices of rare earth materials such as praseodymium and neodymium in related technologies.

[0070] By replacing the relatively expensive praseodymium and neodymium elements in permanent magnets with the abundant and relatively cheap cerium element, the price of permanent magnets can be effectively reduced and the cost performance of motors can be improved. However, the introduction of cerium will reduce the coercive force of permanent magnets to a certain extent, thereby reducing the magnetic energy product of permanent magnets and weakening the magnetic properties of rotors. In order to ensure that the synthetic magnetic field of the air gap remains unchanged, the magnetic field strength of the stator is usually increased by increasing the amount of stator windings. At the same time, the operation of the motor is usually regulated by the controller, and once the model of the power device in the controller is determined, the maximum operating voltage of the power device is determined accordingly. Since the rotor magnetic field provided by the permanent magnet of the motor is not adjustable, weak magnetic control is usually required to avoid the load voltage of the motor exceeding the allowable value of the power device at high speed. However, blindly increasing the stator magnetic field strength to compensate for the loss of the synthetic magnetic field of the air gap will aggravate the influence of the armature reaction of the stator, which is not conducive to the capacity output of the motor at high speed weak magnetic field, thereby limiting the operating range of the compressor. This requires a matching and balanced design of the motor's stator and rotor magnetic fields, and reasonable adjustment of the motor's permanent magnets, windings and other materials. Under the constraint of the maximum operating voltage of the power device, the motor's back EMF design value must meet the motor's weak magnetic overload capacity, thereby improving the motor's cost-effectiveness.

[0071] It can be understood that when the load is symmetrical, the influence of the armature magnetomotive force on the fundamental wave of the main pole magnetic field is the armature reaction. The armature reaction will affect the performance of the motor. The influence of the armature reaction can be reduced from two aspects. On the one hand, the magnetic field of the stator is weakened. On the other hand, the magnetic field of the rotor is enhanced. The magnetic field of the stator is correlated with the parameters of the windings wound on the stator teeth of the stator core. The magnetic field of the rotor is correlated with the parameters of the permanent magnets. Therefore, by optimizing the relationship between the weight Mp of multiple permanent magnets and the weight Mc of the windings, the synthetic magnetic field of the air gap can be in a balanced state. In this way, the output capacity of the motor at high speed and weak magnetic field can be improved, which is conducive to reducing the armature reaction.

[0072] It is understandable that the permanent magnet contains cerium, and the amount of cerium can also affect the magnetic field of the rotor. If the mass percentage of cerium in the permanent magnet is too large, it is not conducive to improving the magnetic field of the rotor and will aggravate the armature reaction. If the mass percentage of cerium in the permanent magnet is too small, the production cost of the rotor is still high.

[0073] It is understandable that the back EMF value Ke of the motor at 1000 rpm is related to the maximum allowable operating voltage Ub of the power device of the motor controller. If the back EMF value Ke of the motor at 1000 rpm is too high, the power device is prone to breakdown. If the back EMF value Ke of the motor at 1000 rpm is too low, the performance of the motor cannot be effectively exerted.

[0074] Therefore, by reasonably setting the mass percentage X% of cerium in each permanent magnet, the weight Mp of multiple permanent magnets, the weight Mc of the winding, the maximum allowable operating voltage Ub of the power device of the motor controller and the back electromotive force value Ke of the motor at a speed of 1000rpm, so as to satisfy: (Mp / Mc)×Ub×X%≤Ke, the effect of armature reaction when the motor is loaded can be reduced while improving the cost performance of the motor, which is beneficial to enhancing the load capacity of the motor at high speed and weak magnetic field, and is beneficial to reducing the production cost of the motor. Thus, by using permanent magnets with a higher cerium content, the content of praseodymium and neodymium elements in the permanent magnets can be reduced, achieving a better purpose of reducing costs and increasing efficiency.

[0075] In some embodiments, optionally, the mass percentage of cerium in the permanent magnet satisfies: 2%<X%<8%.

[0076] In this embodiment, the range of the mass percentage of cerium in the permanent magnet is further limited so that the mass percentage of cerium in the permanent magnet satisfies: 2%<X%<8%. This setting takes into account both the performance and production cost of the motor.

[0077] That is, adding the low-priced and abundant cerium element to the permanent magnet can reduce the use of expensive and scarce heavy rare earths, which can reduce the production cost of the motor. In other words, while ensuring the performance of the motor, the cost of the permanent magnet is reduced, improving the cost performance of the motor.

[0078] If the mass percentage of cerium in the permanent magnet is greater than or equal to 8%, the coercive force of the permanent magnet will decrease, which will reduce the magnetic energy product of the permanent magnet and weaken the magnetic properties of the rotor, which will in turn affect the motor's anti-demagnetization ability and motor efficiency, causing demagnetization of the rotor during operation and reducing the reliability and stability of the motor.

[0079] If the mass percentage of cerium in the permanent magnet is less than or equal to 2%, the degree of replacement of praseodymium and neodymium is limited, which limits the extent of reducing the production cost of the motor.

[0080] In some embodiments, optionally, along the radial direction of the rotor, a value of the minimum gap from the outer circumferential wall of the rotor to the inner circumferential wall of the stator is denoted as δ, wherein 0.08<δ / d2<0.15.

[0081] In this embodiment, the structure of the motor is further defined so that along the radial direction of the rotor, the value of the minimum gap from the outer circumferential wall of the rotor to the inner circumferential wall of the stator is recorded as δ, and the relationship between the minimum gap δ from the outer circumferential wall of the rotor to the inner circumferential wall of the stator and the slot width d2 of the stator slot of the second punching sheet group is defined to satisfy: 0.08<δ / d2<0.15. By optimizing the ratio of the slot width of the second punching sheet group to the stator-rotor gap, the power density of the motor can be guaranteed, the radial force density of the motor can be improved, and the noise of the motor can be ensured not to deteriorate.

[0082] If δ / d2 is less than or equal to 0.08, the air gap magnetic flux density of the motor will increase, which will increase the radial force density of the motor and the operating noise of the motor.

[0083] If δ / d2 is greater than or equal to 0.15, the magnetic resistance is large, the energy consumption of the motor is large, the output torque of the motor will be reduced, and the performance of the motor will be reduced.

[0084] The fourth aspect of the present application proposes a compressor, comprising: a motor as in any technical solution in the third aspect.

[0085] The compressor provided in the present application includes a motor as in any technical solution in the third aspect, and therefore has all the beneficial effects of the above-mentioned motors, which will not be described one by one here.

[0086] A fifth aspect of the present application provides a vehicle, comprising: a compressor as in the fourth aspect.

[0087] Since the vehicle provided in the present application includes a compressor as in the fourth aspect, it has all the beneficial effects of the above-mentioned compressor, which will not be described one by one here.

[0088] It is worth noting that the vehicle can be a new energy vehicle, which includes pure electric vehicles, extended-range electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0089] Additional aspects and advantages of the present application will become apparent in the following description or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0090] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0091] Figure 1 A schematic structural diagram of a stator core from a first perspective of an embodiment of the present application is shown;

[0092] Figure 2 A schematic structural diagram of a stator core from a second perspective of an embodiment of the present application is shown;

[0093] Figure 3 A partial structural schematic diagram of a motor according to an embodiment of the present application is shown;

[0094] Figure 4 A schematic structural diagram of a compressor according to an embodiment of the present application is shown;

[0095] Figure 5 A schematic diagram showing a change trend of radial force density and output torque of a motor according to an embodiment of the present application is shown;

[0096] Figure 6 A schematic diagram showing the changing trend of the armature reaction voltage and the output torque of the motor of the first embodiment of the present application is shown;

[0097] Figure 7 A schematic diagram showing the changing trend of the armature reaction voltage and the output torque of the motor according to the second embodiment of the present application is shown;

[0098] Figure 8 A maximum torque variation curve diagram of a motor according to an embodiment of the present application is shown.

[0099] in, Figures 1 to 4 The corresponding relationship between the reference numerals and component names in the figure is:

[0100] 1 motor, 10 stator, 100 stator core, 110 first punching sheet group, 120 second punching sheet group, 130 annular yoke, 140 tooth portion, 150 stator slot, 160 third punching sheet group, 170 tooth surface, 172 arc segment, 174 connecting segment, 200 winding, 30 rotor, 310 rotor core, 320 shaft hole, 330 magnet slot group, 340 slit group, 342 slit, 350 permanent magnet, 4 compressor, 41 cover plate, 42 inverter, 43 drive shaft, 44 suction port, 45 housing, 46 compression portion, 47 discharge port, 50 assembly cavity. DETAILED DESCRIPTION

[0101] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0102] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0103] Refer to the following Figures 1 to 8 A stator core 100 , a stator 10 , a motor 1 , a compressor 4 , and a vehicle according to some embodiments of the present application.

[0104] like Figure 1 and Figure 2 As shown, according to a stator core 100 of some embodiments of the present application, the stator core 100 includes a first punching sheet group 110 and a second punching sheet group 120 .

[0105] Along the axial direction of the stator core 100 , the second punching sheet group 120 is stacked on one side of the first punching sheet group 110 .

[0106] Furthermore, the second punching sheet group 120 is closer to the end of the stator core 100 than the first punching sheet group 110 .

[0107] Either the first punching plate group 110 or the second punching plate group 120 includes an annular yoke portion 130 and a plurality of teeth portions 140 .

[0108] Each tooth portion 140 is connected to the inner peripheral wall of the annular yoke portion 130 .

[0109] The plurality of teeth 140 are arranged at intervals around the axis of the stator core 100 .

[0110] Two adjacent tooth portions 140 and the annular yoke portion 130 enclose a stator slot 150 .

[0111] Along the circumferential direction of the stator core 100 , the slot width of the stator slots 150 of the first punching sheet group 110 is denoted as d1 , and the slot width of the stator slots 150 of the second punching sheet group 120 is denoted as d2 , wherein 1<d2 / d1<3.

[0112] In this embodiment, the stator core 100 includes a first punching sheet group 110 and a second punching sheet group 120 .

[0113] The first punching sheet group 110 and the second punching sheet group 120 are arranged along the axial direction of the stator core 100 . Specifically, along the axial direction of the stator core 100 , the second punching sheet group 120 is stacked on one side of the first punching sheet group 110 .

[0114] The first punching sheet group 110 includes an annular yoke 130 and a plurality of tooth portions 140 , any one of the plurality of tooth portions 140 is connected to the inner circumferential wall of the annular yoke 130 , the plurality of tooth portions 140 are arranged at intervals around the axis of the stator core 100 , and two adjacent tooth portions 140 and the annular yoke 130 enclose a stator slot 150 .

[0115] The second punching sheet group 120 includes an annular yoke 130 and a plurality of tooth portions 140 , wherein any one of the plurality of tooth portions 140 is connected to the inner circumferential wall of the annular yoke 130 , and the plurality of tooth portions 140 are arranged at intervals around the axis of the stator core 100 , and two adjacent tooth portions 140 and the annular yoke 130 enclose a stator slot 150 .

[0116] like Figure 2 As shown, the structures of the first punching sheet group 110 and the second punching sheet group 120 are defined, so that the width of the notches of the stator slots 150 of the first punching sheet group 110 in the circumferential direction of the stator core 100 is recorded as d1, and the width of the notches of the stator slots 150 of the second punching sheet group 120 in the circumferential direction of the stator core 100 is recorded as d2, and the relationship between d1 and d2 is defined to satisfy: 1<d2 / d1<3.

[0117] The slot width d1=2.0mm of the stator slot 150 of the first punching sheet group 110 can effectively prevent the slot insulation from bulging inwards, but a smaller slot width will increase magnetic leakage, resulting in a decrease in the output torque of the motor 1 and an increase in the armature reaction voltage of the motor 1. If the slot width of the motor 1 is too large, the effective stator-rotor gap of the motor 1 will increase, resulting in a decrease in the output torque of the motor 1 and an increase in the armature reaction voltage of the motor 1. When the load is symmetrical, the effect of the armature magnetomotive force on the fundamental wave of the main pole magnetic field is the armature reaction. The armature reaction will affect the performance of the motor 1. For example Figure 7 As shown, the present application reasonably arranges the structure of the stator core 100 so that the first punching sheet group 110 and the second punching sheet group 120 are arranged with different slot widths in the circumferential direction of the stator core 100. In this way, the armature reaction of the motor 1 can be improved, the voltage of the armature reaction of the motor 1 can be reduced, and the torque output of the motor 1 under high-speed conditions can be improved.

[0118] If d2 / d1 is less than or equal to 1, the difference between the slot width of the first punching sheet group 110 in the circumferential direction of the stator core 100 and the slot width of the second punching sheet group 120 in the circumferential direction of the stator core 100 is small, that is, the slot width of the first punching sheet group 110 in the circumferential direction of the stator core 100 is closer to the slot width of the second punching sheet group 120 in the circumferential direction of the stator core 100. In this way, the effect of alleviating the armature reaction is poor, and the effect of improving the torque output of the motor 1 under high-speed conditions is poor.

[0119] If d2 / d1 is greater than or equal to 3, the width of the stator slot 150 of the second punching sheet group 120 in the circumferential direction of the stator core 100 is too large, so that the winding 200 wound on the teeth 140 of the first punching sheet group 110 and the second punching sheet group 120 cannot be effectively blocked, and the winding 200 is prone to be separated from the teeth 140, and the stability and reliability of the electronic movement cannot be guaranteed. In addition, this setting will increase the gap between the stator and rotor 30 of the motor 1, which will affect the capacity density of the motor 1 and the torque output of the motor 1.

[0120] In addition, the second punching sheet group 120 is closer to the end of the stator core 100 than the first punching sheet group 110, that is, the distance from the second punching sheet group 120 to the end of the stator core 100 is smaller than the distance from the first punching sheet group 110 to the end of the stator core 100, and the width d1 of the stator slot 150 of the first punching sheet group 110 in the circumferential direction of the stator core 100 and the width d2 of the stator slot 150 of the second punching sheet group 120 in the circumferential direction of the stator core 100 satisfy 1<d2 / d1<3. In other words, along the circumference of the stator core 100, the punching sheet group with a smaller slot width is closer to the middle of the stator core 100. In this way, the problem of the slot insulation of the stator 10 protruding from the inner diameter of the stator core 100 can be effectively prevented, and the reliability of the motor 1 can be improved.

[0121] Optionally, any two adjacent tooth portions 140 and the annular yoke portion 130 enclose a stator slot 150 .

[0122] In some embodiments, d1 and d2 satisfy: 1.5<d2 / d1<3.

[0123] In this embodiment, the matching structure of the first punching sheet group 110 and the second punching sheet group 120 is further defined, so that the width d1 of the stator slot 150 of the first punching sheet group 110 in the circumferential direction of the stator core 100 and the width d2 of the stator slot 150 of the second punching sheet group 120 in the circumferential direction of the stator core 100 satisfy: 1.5<d2 / d1<3, that is, it is possible to improve the armature reaction of the motor 1, reduce the voltage of the armature reaction of the motor 1, and improve the torque output of the motor 1 under high-speed conditions.

[0124] Optionally, d2 / d1=1.7, d2 / d1=1.9, d2 / d1=2, d2 / d1=2.2, d2 / d1=2.4, d2 / d1=2.6 and d2 / d1=2.8, etc., which are not listed here one by one.

[0125] In some embodiments, the number of the first punching sheet groups 110 is denoted as m.

[0126] The number of the second punching sheet groups 120 is denoted as n.

[0127] A first punching sheet group 110 is disposed between any two adjacent second punching sheet groups 120 .

[0128] Among them, m≥1, n≥2.

[0129] In this embodiment, the structures of the first punching sheet group 110 and the second punching sheet group 120 are further defined, so that the number of the first punching sheet group 110 is recorded as m, the number of the second punching sheet group 120 is recorded as n, m≥1, n≥2. It is also defined that a first punching sheet group 110 is provided between any two adjacent second punching sheet groups 120. That is, the second punching sheet group 120 is provided at the axial end surface of each first punching sheet group 110.

[0130] This arrangement can meet the use requirements of setting different slot widths of the first punching sheet group 110 and the second punching sheet group 120 in the circumferential direction of the stator core 100, and make the number of the first punching sheet group 110 smaller than the number of the second punching sheet group 120. In this way, the slot insulation of the stator 10 can be effectively prevented from protruding from the inner diameter of the stator core 100, which can improve the reliability of the motor 1 and help reduce the material input of the stator core 100, thereby helping to reduce the weight of the stator core 100 and reduce the production cost of the stator core 100.

[0131] It is understandable that if the slot width of the punching sheet group in the circumferential direction of the stator core 100 is small, the magnetic flux leakage will increase significantly, thus reducing the output torque of the motor 1. Therefore, the number of the first punching sheet group 110 is smaller than the number of the second punching sheet group 120, so as to take into account the magnetic flux leakage of the motor 1 and prevent the slot insulation of the stator 10 from protruding from the inner diameter of the stator core 100, which is conducive to improving the safety and reliability of the use of the motor 1.

[0132] In this embodiment, the number of the first punching sheet group 110 is one, the number of the second punching sheet groups 120 is two, and one first punching sheet group 110 is disposed between the two second punching sheet groups 120 .

[0133] In some other embodiments, there are multiple first punching sheet groups 110 , and there are multiple second punching sheet groups 120 . A first punching sheet group 110 is disposed between any two adjacent second punching sheet groups 120 .

[0134] In some other embodiments, there are multiple first punching sheet groups 110 , multiple second punching sheet groups 120 , multiple first punching sheet groups 110 are arranged between any two adjacent second punching sheet groups 120 , and so on, which are not listed here one by one.

[0135] In some embodiments, Figure 1 As shown, the axial height of the first punching sheet group 110 is denoted as h1.

[0136] The axial height of the second punching sheet group 120 is denoted as h2.

[0137] Among them, 0.05<(m×h1) / (n×h2)<0.2.

[0138] In this embodiment, the structures of the first punching sheet group 110 and the second punching sheet group 120 are further defined, so that along the axial direction of the stator core 100, the height of the first punching sheet group 110 is recorded as h1, and the height of the second punching sheet group 120 is recorded as h2, and the relationship between h1 and h2 is defined to satisfy: 0.05<(m×h1) / (n×h2)<0.2. In other words, the relationship between the sum of the axial heights of all the first punching sheet groups 110 included in the stator core 100 and the sum of the axial heights of all the second punching sheet groups 120 included in the stator core 100 is defined. Because reducing the slot width of the second punching sheet group 120 in the circumferential direction of the stator core 100 will increase the risk of magnetic leakage of the stator 10, therefore, by defining the optimal ratio of the axial heights of the first punching sheet group 110 and the second punching sheet group 120, the risk of magnetic leakage can be minimized to the maximum extent, that is, the magnetic leakage can be reduced under the premise of ensuring the performance of the motor 1.

[0139] Optionally, (m×h1) / (n×h2)=0.06, (m×h1) / (n×h2)=0.07, (m×h1) / (n×h2)=0.08, (m×h1) / (n×h2)=0.09, (m×h1) / (n×h2)=0.1, (m×h1) / (n×h2)=0.12, (m×h1) / (n×h2)=0.14, (m×h1) / (n×h2)=0.16 and (m×h1) / (n×h2)=0.18, etc., which are not listed here one by one.

[0140] In some embodiments, Figure 1 As shown, the stator core 100 further includes a third punching sheet group 160 .

[0141] The second punching sheet group 120 is located between the first punching sheet group 110 and the third punching sheet group 160 .

[0142] The third punching plate group 160 includes an annular yoke portion 130 and a plurality of teeth portions 140 .

[0143] Along the circumferential direction of the stator core 100 , the slot width of the stator slot 150 of the third punching sheet group 160 is denoted as d3 , wherein d3 > d2 > d1 .

[0144] In this embodiment, the structure of the stator core 100 is further defined so that the stator core 100 also includes a third punching sheet group 160. Along the axial direction of the stator core 100, the second punching sheet group 120 is located between the first punching sheet group 110 and the third punching sheet group 160. In other words, the third punching sheet group 160 is located at the end of the stator core 100.

[0145] The third punching sheet group 160 includes an annular yoke 130 and a plurality of tooth portions 140 , any one of the plurality of tooth portions 140 is connected to the inner circumferential wall of the annular yoke 130 , the plurality of tooth portions 140 are arranged at intervals around the axis of the stator core 100 , and any two adjacent tooth portions 140 and the annular yoke 130 enclose a stator slot 150 .

[0146] The structures of the first punching sheet group 110, the second punching sheet group 120 and the third punching sheet group 160 are defined, so that the width of the notch of the stator slot 150 of the first punching sheet group 110 in the circumferential direction of the stator core 100 is recorded as d1, the width of the notch of the stator slot 150 of the second punching sheet group 120 in the circumferential direction of the stator core 100 is recorded as d2, and the width of the notch of the stator slot 150 of the third punching sheet group 160 in the circumferential direction of the stator core 100 is recorded as d3, and the relationship between d1, d2 and d3 is defined so as to satisfy: d3>d2>d1. That is to say, along the axial direction of the stator core 100, the width of the notch of the first punching sheet group 110, the second punching sheet group 120 and the third punching sheet group 160 in the circumferential direction of the stator core 100 gradually increases, and this setting can reduce magnetic leakage and improve the output torque of the motor 1. In other words, the first punching sheet group 110, the second punching sheet group 120 and the third punching sheet group 160 are provided with different slot widths in the circumferential direction of the stator core 100, so that the armature reaction of the motor 1 can be improved, the voltage of the armature reaction of the motor 1 can be reduced, and the torque output of the motor 1 under high-speed conditions can be improved.

[0147] It can be understood that the first punching sheet group 110 with a smaller slot width in the circumferential direction of the stator core 100 is located in the middle of the stator core 100, and the third punching sheet group 160 with a larger slot width in the circumferential direction of the stator core 100 is located at the end of the stator core 100. In this way, the problem of the slot insulation of the stator 10 protruding from the inner diameter of the stator core 100 can be effectively prevented, thereby improving the reliability of the motor 1.

[0148] In other words, this arrangement takes into account both the magnetic flux leakage of the motor 1 and the inner diameter of the stator core 100 that is blocked by slot insulation of the stator 10 , which is beneficial to improving the safety and reliability of the use of the motor 1 .

[0149] In this embodiment, there are multiple third punching sheet groups 160 .

[0150] In some other embodiments, the number of the third punching sheet group 160 is one. Figure 1 As shown, the stator core 100 includes a first punching sheet group 110 , two second punching sheet groups 120 and two third punching sheet groups 160 .

[0151] Optionally, along the circumferential direction of the stator core 100, the slot width of the stator slot 150 of any of the first punching sheet group 110, the second punching sheet group 120 and the third punching sheet group 160 is greater than or equal to 1.8 mm and less than or equal to 4 mm. For example, slot width = 2 mm, slot width = 2.2 mm, slot width = 2.4 mm, slot width = 2.6 mm, slot width = 2.8 mm, slot width = 3 mm, slot width = 3.2 mm, slot width = 3.4 mm, slot width = 3.6 mm and slot width = 3.8 mm, etc., which are not listed here one by one.

[0152] In some embodiments, Figure 2 As shown, along the axial direction of the stator core 100 , the orthographic projection of the slot wall of the stator slot 150 of the third punching sheet group 160 on the second punching sheet group 120 is located outside the slot wall of the stator slot 150 of the second punching sheet group 120 .

[0153] In this embodiment, the structures of the second punching sheet group 120 and the third punching sheet group 160 are further defined. Along the axial direction of the stator core 100, the orthographic projection of the slot wall of the stator slot 150 of the third punching sheet group 160 on the second punching sheet group 120 is located outside the slot wall of the stator slot 150 of the second punching sheet group 120. The cross-sectional area of ​​the stator slot 150 of the third punching sheet group 160 is greater than the cross-sectional area of ​​the stator slot 150 of the second punching sheet group 120. That is, the slot wall of the stator slot 150 of the third punching sheet group 160 and the second punching sheet group 120 enclose a sink, that is, at least a portion of the slot wall of the stator slot 150 of the third punching sheet group 160 and the slot wall of the stator slot 150 of the second punching sheet group 120 form a stepped structure.

[0154] Specifically, the stator 10 further includes an insulating bracket. When the stator core 100 is connected with the insulating bracket, an insulating protrusion is provided on the insulating bracket. The insulating protrusion abuts against the sink groove, and the insulating protrusion can be covered at the edge of the stator slot 150 of the third punching sheet group 160. In this way, on the basis of ensuring the performance of the motor 1, the height of the stator 10 can be reduced along the axial direction of the stator core 100, which is conducive to reducing the occupation rate of the stator 10 to the internal space of the motor 1, and is conducive to reducing the volume of the motor 1 and reducing the weight of the motor 1.

[0155] Moreover, this arrangement is conducive to increasing the matching area and matching angle between the insulating bracket and the stator core 100 , and is conducive to improving the stability and reliability of the matching between the insulating bracket and the stator core 100 .

[0156] In addition, this arrangement can shorten the length of each turn of the winding 200, reduce the amount of the winding 200 used, and reduce the production cost of the product.

[0157] In this embodiment, along the axial direction of the stator core 100 , the slot wall of the stator slot 150 of the second punching sheet group 120 (excluding the slot opening of the stator slot 150 ) is projected on the second punching sheet group 120 and coincides with the slot wall of the stator slot 150 of the second punching sheet group 120 .

[0158] In some other embodiments, along the axial direction of the stator core 100, the slot walls of the stator slots 150 of the second punching sheet group 120 and the slot walls of the stator slots 150 of the third punching sheet group 160 are respectively projected onto the first punching sheet group 110, and the projections of the slot walls of the stator slots 150 of the second punching sheet group 120 are located between the projections of the slot walls of the stator slots 150 of the first punching sheet group 110 and the slot walls of the stator slots 150 of the third punching sheet group 160.

[0159] In some embodiments, Figure 2 As shown, the wall surface of the tooth portion 140 facing the axis of the stator core 100 is a tooth surface 170 .

[0160] The tooth surface 170 of at least one of the first punching plate group 110 , the second punching plate group 120 and the third punching plate group 160 includes an arc segment 172 and a connecting segment 174 .

[0161] The connecting segment 174 is connected to one side of the arc segment 172 in the circumferential direction of the stator core 100 .

[0162] The arc segment 172 is closer to the axis of the stator core 100 than the connecting segment 174 .

[0163] In this embodiment, a wall surface of the tooth portion 140 facing the axis of the stator core 100 is a tooth surface 170 .

[0164] The structures of the first punching sheet group 110 , the second punching sheet group 120 and the third punching sheet group 160 are further defined.

[0165] Specifically, the tooth surface 170 of the first punching sheet group 110 includes a circular arc segment 172 and a connecting segment 174, or the tooth surface 170 of the second punching sheet group 120 includes a circular arc segment 172 and a connecting segment 174, or the tooth surface 170 of the third punching sheet group 160 includes a circular arc segment 172 and a connecting segment 174, or the tooth surface 170 of the first punching sheet group 110 and the tooth surface 170 of the second punching sheet group 120 both include a circular arc segment 172 and a connecting segment 174, or the first punching sheet group 1 The tooth surface 170 of the first punching sheet group 110 and the tooth surface 170 of the third punching sheet group 160 both include a circular arc segment 172 and a connecting segment 174, or the tooth surface 170 of the second punching sheet group 120 and the tooth surface 170 of the third punching sheet group 160 both include a circular arc segment 172 and a connecting segment 174, or any one of the tooth surface 170 of the first punching sheet group 110, the tooth surface 170 of the second punching sheet group 120 and the tooth surface 170 of the third punching sheet group 160 includes a circular arc segment 172 and a connecting segment 174.

[0166] The connecting section 174 is connected to one side of the arc section 172, and the connecting section 174 and the arc section 172 are arranged along the circumferential direction of the stator core 100. The arc section 172 is closer to the axis of the stator core 100 than the connecting section 174, that is, the distance from the arc section 172 to the axis of the stator core 100 is smaller than the distance from the connecting section 174 to the axis of the stator core 100.

[0167] This arrangement realizes the chamfering of the tooth top of the tooth portion 140 of the stator core 100, which is beneficial to improving the distribution of the air gap synthetic magnetic field of the motor 1, can alleviate the armature reaction, and can enhance the torque output of the motor 1 under high-speed conditions.

[0168] In some embodiments, the connecting segment 174 includes any one of the following or a combination thereof: a planar segment, a folded surface segment, and a curved surface segment.

[0169] In this embodiment, the structure of the connecting segment 174 is further defined, so that the connecting segment 174 includes any one of the following or a combination thereof: a plane segment, a folded surface segment, and a curved surface segment.

[0170] For example, the connecting segment 174 includes a plane segment. For example, the connecting segment 174 includes a folded surface segment. For example, the connecting segment 174 includes a curved surface segment. For example, the connecting segment 174 includes a plane segment and a folded surface segment. For example, the connecting segment 174 includes a plane segment and a curved surface segment. For example, the connecting segment 174 includes a folded surface segment and a curved surface segment. For example, the connecting segment 174 includes a plane segment, a folded surface segment, and a curved surface segment.

[0171] This arrangement can meet the use requirement that the distance from the connecting segment 174 to the axis of the stator core 100 is greater than the distance from the arc segment 172 to the axis of the stator core 100 , and can improve the armature reaction.

[0172] In the present application, the number of the arc segments 172 is one, the number of the connecting segments 174 is two, and the arc segment 172 is connected between the two connecting segments 174 .

[0173] In some other embodiments, the number of the connecting segment 174 and the number of the arc segment 172 are both one.

[0174] In some embodiments, Figure 2 As shown, the distance from the axis of the stator core 100 to the end surface of the tooth portion 140 facing away from the annular yoke portion 130 is recorded as D1.

[0175] The distance from the axis of the stator core 100 to the outer peripheral wall of the annular yoke 130 is denoted as D2.

[0176] Among them, 0.6≤D1 / D2≤0.7.

[0177] In this embodiment, the structure of the stator core 100 is further defined, so that the distance from the axis of the stator core 100 to the end surface of the tooth portion 140 away from the annular yoke 130 is recorded as D1, and the distance from the axis of the stator core 100 to the outer peripheral wall of the annular yoke 130 is recorded as D2, that is, the inner diameter of the stator core 100 is recorded as D1, and the outer diameter of the stator core 100 is recorded as D2. And D1 and D2 satisfy 0.6≤D1 / D2≤0.7.

[0178] This setting limits the matching dimensions of the inner diameter and outer diameter of the stator core 100. By optimizing the split ratio of the motor 1, the main magnetic field provided by the permanent magnet 350 of the motor 1 can be increased. Under the condition of the same back electromotive force, the number of turns of the winding 200 of the stator 10 can be reduced, thereby improving the anti-demagnetization ability of the motor 1, and further ensuring the safety and reliability of the use of the motor 1.

[0179] When the inner diameter of the stator core 100 is increased, the outer diameter of the stator core 100 is also increased, so that the amount of magnets used can be increased and the power density of the motor 1 can be improved.

[0180] If D1 / D2 is greater than 0.7, the area of ​​the stator slot 150 of the stator 10 will be reduced, so that the stator teeth and yoke of the stator 10 are saturated with magnetic flux, and the armature magnetic flux is sharply reduced, resulting in deterioration of the output power of the motor 1 .

[0181] Specifically, the ratios of D1 and D2 include 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68 and 0.69, etc., which are not listed here one by one.

[0182] Specifically, when the ratio of D1 to D2 is within the above range, the efficiency of the motor 1 is higher and the copper loss of the motor 1 is lower, that is, the efficiency, copper loss and iron loss of the motor 1 are taken into consideration.

[0183] like Figure 6 As shown, when the relationship between D1 and D2 satisfies 0.6≤D1 / D2≤0.7, the armature reaction voltage is reduced and the output torque is increased.

[0184] According to some other embodiments of the present application, a stator 10 includes: a stator core 100 as in any of the above embodiments.

[0185] In this embodiment, the stator 10 provided in the present application includes the stator core 100 as in any of the above embodiments, and therefore has all the beneficial effects of the above stator core 100, which are not described one by one here.

[0186] like Figure 3 As shown, according to some other embodiments of the present application, a motor 1 is provided, and the motor 1 includes a stator 10 and a rotor 30 as in the above embodiments.

[0187] The plurality of teeth 140 of the stator core 100 enclose an assembly cavity 50 .

[0188] The rotor 30 is rotatably disposed in the assembly cavity 50 .

[0189] In this embodiment, the motor 1 includes a stator 10 and a rotor 30. A plurality of teeth 140 of the stator core 100 enclose an assembly cavity 50, and the rotor 30 is rotatably disposed in the assembly cavity 50. Since the motor 1 includes the stator 10 in the above embodiment, it has all the beneficial effects of the above stator 10, which are not described one by one here.

[0190] In some embodiments, Figure 3 As shown, the rotor 30 includes a rotor core 310 , a shaft hole 320 , a plurality of magnet slot groups 330 , and a plurality of slot groups 340 .

[0191] The rotor core 310 is disposed in the assembly cavity 50 .

[0192] The shaft hole 320 is disposed in the rotor core 310 .

[0193] A plurality of magnet slot groups 330 are provided on the rotor core 310 , and the plurality of magnet slot groups 330 are arranged at intervals around the shaft hole 320 .

[0194] A plurality of slot groups 340 are disposed on the rotor core 310 . One slot group 340 is arranged between each magnet slot group 330 and the outer peripheral wall of the rotor core 310 . The slot group 340 includes an odd number of slots 342 .

[0195] In this embodiment, the structure of the rotor 30 is further defined, and the rotor 30 includes a rotor core 310 , a shaft hole 320 , a plurality of magnet slot groups 330 , and a plurality of slot groups 340 .

[0196] A plurality of magnet slot groups 330 are disposed on the rotor core 310 , and the plurality of magnet slot groups 330 are arranged at intervals around the shaft hole 320 .

[0197] A plurality of slot groups 340 are disposed on the rotor core 310 , and the plurality of slot groups 340 are arranged at intervals around the shaft hole 320 .

[0198] A slot group 340 is arranged between each magnet slot group 330 and the outer peripheral wall of the rotor core 310 .

[0199] The slit group 340 includes an odd number of slits 342 .

[0200] The motor 1 is applied to the compressor 4 . Since the compressor 4 is a pulsating load, the structure of the rotor 30 is reasonably set so that the slot group 340 on the rotor core 310 includes an odd number of slots 342 .

[0201] In this way, the radial force density of the motor 1 can be effectively improved, the noise and vibration level of the motor 1 can be improved, and then the noise and vibration of the compressor 4 can be improved.

[0202] In some embodiments, Figure 3 and Figure 8 As shown, the rotor 30 further includes a plurality of permanent magnets 350 , with one permanent magnet 350 being disposed in each magnet slot group 330 .

[0203] The permanent magnet 350 contains X mass % of cerium.

[0204] The stator 10 further includes a winding 200 and a plurality of stator teeth, and the winding 200 is wound around the plurality of stator teeth.

[0205] The weight of the plurality of permanent magnets 350 is denoted as Mp.

[0206] The weight of the winding 200 is denoted as Mc.

[0207] The back electromotive force value of motor 1 at a rotation speed of 1000 rpm is denoted as Ke.

[0208] The highest permissible operating voltage of the power devices of the controller of the motor 1 is denoted as Ub.

[0209] Among them, (Mp / Mc)×Ub×X%≤Ke.

[0210] In this embodiment, the stator 10 includes a stator core 100 and a winding 200 . The stator core 100 includes a plurality of stator teeth, and the winding 200 is wound around the plurality of stator teeth.

[0211] The weight of the plurality of permanent magnets 350 is recorded as Mp, the weight of the winding 200 is recorded as Mc, the back electromotive force value of the motor 1 at a rotation speed of 1000 rpm is recorded as Ke, and the maximum allowable operating voltage of the power device of the controller of the motor 1 is recorded as Ub.

[0212] Among them, using the permanent magnet 350 containing cerium as the magnetic pole can reduce the content of praseodymium and neodymium elements in the permanent magnet 350, so that the production cost of the permanent magnet 350 can be reduced, and then the production cost of the motor 1 can be reduced, solving the problem of high cost of the motor 1 caused by the high price of rare earth materials such as praseodymium and neodymium in the related technology.

[0213] By replacing the relatively expensive praseodymium and neodymium elements in the permanent magnet 350 with the abundant and relatively cheap cerium element, the price of the permanent magnet 350 can be effectively reduced, and the cost performance of the motor 1 can be improved. However, the introduction of the cerium element will reduce the coercive force of the permanent magnet 350 to a certain extent, thereby reducing the magnetic energy product of the permanent magnet 350, and the magnetic properties of the rotor 30 will be weakened. In order to ensure that the synthetic magnetic field of the air gap remains unchanged, the magnetic field strength of the stator 10 is usually increased by increasing the amount of the winding 200 of the stator 10. At the same time, the operation of the motor 1 is usually regulated by the controller, and once the model of the power device in the controller is determined, the maximum operating voltage of the power device is determined accordingly. Since the magnetic field of the rotor 30 provided by the permanent magnet 350 of the motor 1 is not adjustable, weak magnetic control is usually required to avoid the load voltage of the motor 1 exceeding the allowable value of the power device at high speed. However, blindly increasing the magnetic field strength of the stator 10 to compensate for the loss of the air gap synthetic magnetic field will increase the influence of the armature reaction of the stator 10, which is not conducive to the capacity output of the motor 1 at high speed and weak magnetic field, thereby limiting the operating range of the compressor 4. This requires matching and balancing the magnetic fields of the stator and rotor 30 of the motor 1, and reasonably adjusting the material usage of the permanent magnet 350, winding 200, etc. of the motor 1. Under the constraint of the maximum operating voltage of the power device, the back electromotive force design value of the motor 1 meets the weak magnetic overload capacity of the motor 1, thereby improving the cost performance of the motor 1.

[0214] It can be understood that when the load is symmetrical, the influence of the armature magnetomotive force on the fundamental wave of the main pole magnetic field is the armature reaction. The armature reaction will affect the performance of the motor 1. The influence of the armature reaction can be reduced from two aspects. On the one hand, the magnetic field of the stator 10 is weakened. On the other hand, the magnetic field of the rotor 30 is enhanced. The magnetic field of the stator 10 is correlated with the parameters of the winding 200 wound on the stator teeth of the stator core 100. The magnetic field of the rotor 30 is correlated with the parameters of the permanent magnet 350. Therefore, by optimizing the relationship between the weight Mp of multiple permanent magnets 350 and the weight Mc of the winding 200, the air gap synthetic magnetic field can be in a balanced state. In this way, the output capacity of the motor 1 at high speed and weak magnetic field can be improved, which is conducive to reducing the armature reaction.

[0215] It is understandable that the permanent magnet 350 contains cerium, and the amount of cerium used can also affect the magnetic field of the rotor 30. If the mass percentage of cerium in the permanent magnet 350 is too large, it is not conducive to improving the magnetic field of the rotor 30 and will aggravate the armature reaction. If the mass percentage of cerium in the permanent magnet 350 is too small, the production cost of the rotor 30 is still high.

[0216] It is understandable that the back EMF value Ke of the motor 1 at 1000 rpm is related to the maximum allowable operating voltage Ub of the power device of the controller of the motor 1. If the back EMF value Ke of the motor 1 at 1000 rpm is too high, the power device is easily broken down. If the back EMF value Ke of the motor 1 at 1000 rpm is too low, the performance of the motor 1 cannot be effectively exerted.

[0217] Therefore, by reasonably setting the mass percentage X% of cerium in each permanent magnet 350, the weight Mp of multiple permanent magnets 350, the weight Mc of the winding 200, the maximum allowable operating voltage Ub of the power device of the controller of the motor 1, and the back electromotive force value Ke of the motor 1 at a speed of 1000rpm, so as to satisfy: (Mp / Mc)×Ub×X%≤Ke, the effect of the armature reaction when the motor 1 is loaded can be reduced while improving the cost performance of the motor 1, which is beneficial to enhancing the load capacity of the motor 1 at high speed and weak magnetic field, and is beneficial to reducing the production cost of the motor 1. Therefore, by using permanent magnets 350 with a higher cerium content, the content of praseodymium and neodymium elements in the permanent magnets 350 can be reduced, achieving a better purpose of reducing costs and increasing efficiency.

[0218] In some embodiments, the mass percentage of cerium in the permanent magnet 350 satisfies: 2%<X%<8%.

[0219] In this embodiment, the mass percentage range of cerium in the permanent magnet 350 is further limited so that the mass percentage of cerium in the permanent magnet 350 satisfies: 2%<X%<8%. This setting takes into account both the performance of the motor 1 and the production cost of the motor 1.

[0220] That is, the addition of the relatively cheap and abundant cerium element to the permanent magnet 350 can reduce the use of expensive and scarce heavy rare earths, thereby reducing the production cost of the motor 1. In other words, the cost of the permanent magnet 350 can be reduced while ensuring the performance of the motor 1, thereby improving the cost performance of the motor 1.

[0221] If the mass percentage of cerium in the permanent magnet 350 is greater than or equal to 8%, the coercive force of the permanent magnet 350 decreases, which will reduce the magnetic energy product of the permanent magnet 350 and weaken the magnetic properties of the rotor 30, which will further affect the anti-demagnetization ability and efficiency of the motor 1, causing demagnetization of the rotor 30 during operation, thereby reducing the reliability and stability of the motor 1.

[0222] If the mass percentage of cerium in the permanent magnet 350 is less than or equal to 2%, the degree of replacement of praseodymium with neodymium is limited, which limits the extent of reducing the production cost of the motor 1.

[0223] Specifically, the mass percentage of cerium in the permanent magnet 350 includes 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7% and 7.5%, etc., which are not listed here one by one.

[0224] In some embodiments, Figure 2 and Figure 3 As shown, along the radial direction of the rotor 30 , the value of the minimum gap between the outer peripheral wall of the rotor 30 and the inner peripheral wall of the stator 10 is denoted as δ.

[0225] Among them, 0.08<δ / d2<0.15.

[0226] In this embodiment, the structure of the motor 1 is further defined so that along the radial direction of the rotor 30, the value of the minimum gap from the outer circumferential wall of the rotor 30 to the inner circumferential wall of the stator 10 is recorded as δ, and the relationship between the minimum gap δ from the outer circumferential wall of the rotor 30 to the inner circumferential wall of the stator 10 and the slot width d2 of the stator slot 150 of the second punching sheet group 120 is defined to satisfy: 0.08<δ / d2<0.15. By optimizing the ratio of the slot width of the second punching sheet group 120 to the gap between the stator and the rotor 30, the power density of the motor 1 can be guaranteed, the radial force density of the motor 1 can be improved, and the noise of the motor 1 can be ensured not to deteriorate.

[0227] If δ / d2 is less than or equal to 0.08, the air gap magnetic flux density of the motor 1 will increase, the radial force density of the motor 1 will increase, and the operating noise of the motor 1 will increase.

[0228] If δ / d2 is greater than or equal to 0.15, the magnetic resistance is large, the energy consumption of the motor 1 is large, the output torque of the motor 1 is reduced, and the performance of the motor 1 is reduced.

[0229] like Figure 5As shown, when the relationship between δ and d2 satisfies 0.08<δ / d2<0.15, the radial force density of the motor 1 is improved and the output torque of the motor 1 is increased.

[0230] like Figure 4 As shown, a compressor 4 according to some other embodiments of the present application includes: a motor 1 as in the above embodiment.

[0231] In this embodiment, the compressor 4 of the present application includes the motor 1 as in the above embodiment, and therefore has all the beneficial effects of the above motor 1, which are not described one by one here.

[0232] A vehicle according to some further embodiments of the present application includes: a compressor 4 as in the above embodiments.

[0233] In this embodiment, the vehicle of the present application includes the compressor 4 as in the above embodiment, and therefore has all the beneficial effects of the above compressor 4, which will not be described one by one here.

[0234] It is worth noting that the vehicle can be a new energy vehicle, which includes pure electric vehicles, extended-range electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0235] Specifically, the motor 1 is a permanent magnet synchronous motor, and the motor 1 includes a stator 10 and a rotor 30 .

[0236] The stator 10 includes a stator core 100, and the stator core 100 includes a first punching group 110, a second punching group 120, and a third punching group 160. Any of the first punching group 110, the second punching group 120, and the third punching group 160 includes an annular yoke 130 and a tooth portion 140. Two adjacent tooth portions 140 and the annular yoke 130 enclose a stator slot 150. The first punching group 110 is formed by stacking a plurality of first punchings, and the slot width of the first punching group 110 in the circumferential direction of the stator core 100 is recorded as d1. The second punching group 120 is formed by stacking a plurality of second punchings, and the slot width of the second punching group 120 in the circumferential direction of the stator core 100 is recorded as d2. d1 and d2 satisfy: 1.5<d2 / d1<3.

[0237] The stator core 100 further includes a third punching sheet group 160, which is formed by stacking a plurality of third punching sheets. The third punching sheet group 160 includes an annular yoke 130 and a tooth portion 140. Any two adjacent tooth portions 140 and the annular yoke 130 enclose a stator slot 150. The slot width of the third punching sheet group 160 in the circumferential direction of the stator core 100 is denoted as d3, wherein d3>d2>d1.

[0238] The stator core 100 includes m first punching sheet groups 110 and n second punching sheet groups 120. The axial height of the first punching sheet group 110 is recorded as h1, and the axial height of the second punching sheet group 120 is recorded as h2, wherein 0.05<(m×h1) / (n×h2)<0.2 is satisfied. Since the slot width of the second punching sheet group 120 is reduced, there is a risk of increasing magnetic leakage of the stator 10. By setting the optimal height ratio of the first punching sheet group 110 and the second punching sheet group 120, the risk of magnetic leakage can be minimized to the maximum extent, and the magnetic leakage can be reduced while ensuring the performance of the motor 1.

[0239] Specifically, the total axial height of the stator core 100 is 25 mm. The number of the first punching sheet group 110 is one, and the axial height of the first punching sheet group 110 is 3 mm. The number of the second punching sheet group 120 is two, and the axial height of the second punching sheet group 120 is 11 mm. (m×h1) / (n×h2)=(1×3) / (2×11)≈0.14.

[0240] Specifically, the total axial height of the stator core 100 is 55 mm. The number of the first punching sheet group 110 is one, and the axial height of the first punching sheet group 110 is 3 mm. The number of the second punching sheet group 120 is two, and the axial height of the second punching sheet group 120 is 23.5 mm. (m×h1) / (n×h2)=(1×3) / (2×23.5)≈0.06. Under this proportional relationship, the requirements of the performance and reliability of the motor 1 can be met.

[0241] The value of the minimum gap between the outer peripheral wall of the rotor 30 and the inner peripheral wall of the stator 10 along the radial direction of the rotor 30 is denoted as δ, wherein 0.08<δ / d2<0.15. By optimizing the relationship between d2 and δ, the power density of the motor 1 can be maximized.

[0242] Specifically, the width of the stator slot 150 of the second punching sheet group 120 in the circumferential direction of the stator core 100 is 4.5 mm, and the value of the minimum gap between the outer peripheral wall of the rotor 30 and the inner peripheral wall of the stator 10 is greater than or equal to 0.4 mm and less than or equal to 0.5 mm. This setting can ensure the power density of the motor 1, improve the radial force density of the motor 1, and ensure that the noise of the motor 1 does not deteriorate.

[0243] The rotor 30 includes a permanent magnet 350 , in which the mass percentage of cerium satisfies: 2%<X%<8%, and the permanent magnet 350 does not contain terbium, a heavy rare earth element.

[0244] The inner diameter of the stator core 100 is recorded as D1, and the outer diameter of the stator core 100 is recorded as D2, wherein 0.6≤D1 / D2≤0.7. By optimizing the split ratio of the motor 1, the main magnetic field provided by the permanent magnet 350 can be increased, and under the condition of the same back electromotive force, the number of turns of the stator 10 winding 200 can be reduced, the anti-demagnetization capability of the motor 1 can be improved, and the reliability of the motor 1 can be further ensured.

[0245] The stator core 100 includes a plurality of segmented cores, which are connected end to end around the axis of the stator core 100, and each segmented core includes a plurality of stacked punches. That is, the first punching sheet group 110 includes a plurality of first segmented punches, which are connected end to end around the axis of the stator core 100, the second punching sheet group 120 includes a plurality of second segmented punches, which are connected end to end around the axis of the stator core 100, and the third punching sheet group 160 includes a plurality of third segmented punches, which are connected end to end around the axis of the stator core 100. Along the axial direction of the stator core 100, each segmented core includes a first segmented punch, a second segmented punch, and a third segmented punch. This arrangement can greatly improve the slot fill rate of the motor 1, further improve the power density of the motor 1, and ensure that the product performance requirements are met without using heavy rare earth elements.

[0246] like Figure 4 As shown, the compressor 4 includes a cover plate 41, an inverter 42, a drive shaft 43, a suction port 44, a housing 45, a compression portion 46, and a discharge port 47. The compressor 4 includes an electric compressor.

[0247] The motor 1 is used to rotate the driving shaft 43. The motor 1 includes a stator 10 and a rotor 30.

[0248] The compression unit 46 is driven by the drive shaft 43 to compress the refrigerant.

[0249] The frequency converter 42 is used to control the permanent magnet synchronous motor.

[0250] The housing 45 has a cavity, and the motor 1 is disposed inside the cavity. The driving shaft 43 is fixed to the rotor 30 , and the rotor 30 is disposed inside the stator 10 , and the rotor 30 can rotate together with the driving shaft 43 .

[0251] The motor 1 can ensure both the power density and the reliability of the motor 1 without using heavy rare earth terbium.

[0252] The motor 1 of the present application can both ensure the power density of the motor 1 and reduce the amount of heavy rare earth elements used.

[0253] Specifically, as shown in Table 1, assuming d1 = 2 mm, d2 = 4.5 mm. Along the circumference of the stator core 100, the slot width of the stator core 100 decreases, and the magnetic leakage increases significantly, resulting in a decrease in the output torque of the motor 1. Along the circumference of the stator core 100, the slot width of the stator 10 increases, and there is a problem that the winding 200 (such as copper wire) cannot be effectively blocked.

[0254] Table 1

[0255]

[0256] Therefore, the present application can improve the armature reaction of the motor 1, reduce the armature reaction voltage, and improve the torque output of the motor 1 under high-speed conditions by setting different slot widths for the stator core 100.

[0257] Optionally, the stator core 100 includes a stator yoke 10 and a plurality of stator teeth, each stator tooth is connected to the inner peripheral wall of the stator yoke 10, and the plurality of stator teeth are arranged at intervals around the axis of the stator core 100, and any two adjacent stator teeth and the stator yoke 10 enclose a stator slot 150, and the stator core 100 has an axial first end and a second end; a first insulating frame is provided at the first end; and a second insulating frame is provided at the second end, and either the first insulating frame or the second insulating frame includes a plurality of insulating teeth, and each stator tooth An insulating tooth is connected to the first insulating frame and the second insulating frame. The insulating tooth of at least one of the first insulating frame and the second insulating frame is provided with an extension portion, and the extension portion is located at the slot opening of the stator slot 150; the slot insulating paper is arranged in the stator slot 150, and the slot insulating paper abuts against the extension portion, and the extension portion can at least limit the slot insulating paper in the radial direction of the stator core 100; wherein, along the circumferential direction of the stator core 100, the gap value of the extension portion of two adjacent insulating teeth is recorded as d01, and the slot opening width of the stator slot 150 is recorded as T, wherein d01<T.

[0258] Each stator tooth includes a tooth portion 140 of the first punching sheet group 110 and a tooth portion 140 of the second punching sheet group 120 , and the stator 10 yoke includes an annular yoke portion 130 of the first punching sheet group 110 and an annular yoke portion 130 of the second punching sheet group 120 .

[0259] The first insulating frame is disposed at the first end of the stator core 100, and the second insulating frame is disposed at the second end of the stator core 100. Either the first insulating frame or the second insulating frame includes a plurality of insulating teeth, that is, the first insulating frame includes a plurality of insulating teeth, the second insulating frame includes a plurality of insulating teeth, and each stator tooth is connected to an insulating tooth of the first insulating frame and an insulating tooth of the second insulating frame.

[0260] The insulating teeth of the first insulating frame are provided with extension parts, or the insulating teeth of the second insulating frame are provided with extension parts, or both the insulating teeth of the first insulating frame and the insulating teeth of the second insulating frame are provided with extension parts.

[0261] After the first insulating frame, the second insulating frame, the slot insulating paper and the stator core 100 are assembled, the slot insulating paper is arranged in the stator slot 150, the extension portion extends into the notch of the stator slot 150, and the slot insulating paper abuts against the extension portion. The extension portion can at least limit the slot insulating paper in the radial direction of the stator core 100 to ensure the matching size of the slot insulating paper and the stator slot 150.

[0262] The matching structure of the first insulating frame, the second insulating frame and the stator core 100 is reasonably set, so that the gap value of the extension of two adjacent insulating teeth in the circumferential direction of the stator core 100 is recorded as d01, and the slot width of the stator slot 150 in the circumferential direction of the stator core 100 is recorded as T, and the relationship between d01 and T is defined so as to satisfy d01<T. In other words, the extension located at the slot of the stator slot 150 and the slot wall of the stator slot 150 cooperate to limit the slot insulation paper. Since the gap between the extension of two adjacent insulating teeth in the circumferential direction of the stator core 100 is small, the extension located at the slot of the stator slot 150 can effectively block the slot insulation paper, prevent the slot insulation paper from protruding from the inner diameter of the stator core 100, and avoid the occurrence of undesirable problems such as the inward bulge of the slot insulation paper. And because of the existence of the extension part, the slot width of the stator slot 150 in the circumferential direction of the stator core 100 can be appropriately increased. This setting can reduce magnetic leakage, increase the output torque of the motor 1, improve the high-frequency overload capacity of the motor 1, and help improve the performance of the motor 1 and the reliability of the motor 1. In other words, the slot wall of the stator slot 150 and the extension part cooperate to take into account the magnetic leakage of the motor 1 and the inner convexity of the insulation paper of the blocking slot, which can not only improve the power density of the motor 1, but also ensure the safety and reliability of the use of the motor 1.

[0263] It is understandable that at least one of the first insulating frame and the second insulating frame is provided with an extension, that is, at least one of the first insulating frame and the second insulating frame serves as a mounting carrier of the extension, has the function of mounting and fixing the extension, and can ensure the matching size of the extension, the notch of the stator slot 150 and the slot insulating paper. In other words, the existing structure of the first insulating frame and the second insulating frame is reasonably utilized, and the role of the insulating frame provided with the extension is enriched, so that the insulating frame provided with the extension has both an insulating effect and a function of preventing the slot insulating paper from convexing inwardly. And this setting also provides structural support for increasing the notch of the stator slot 150, and can reduce magnetic leakage and improve the high-frequency overload capacity of the motor 1 while ensuring the matching size of the slot insulating paper and the stator core 100.

[0264] Optionally, the extension portion is connected to a slot wall of the stator slot 150 .

[0265] The matching structure of the extension part and the stator slot 150 is defined so that the extension part is connected to the slot wall of the stator slot 150. That is, the extension part is located at the notch of the stator slot 150, and the extension part and the slot wall of the stator slot 150 are connected to each other. This arrangement enables the extension part and the slot wall of the stator slot 150 to be connected as a whole. In this way, the situation that the slot insulation paper protrudes from the gap between the slot wall of the stator slot 150 and the extension part can be effectively prevented, providing effective and reliable structural support to ensure the safety and reliability of the use of the motor 1.

[0266] Optionally, when the insulating teeth of either the first insulating frame or the second insulating frame are provided with extension portions, along the circumference of the stator core 100 , the gap value of the extension portions of two adjacent insulating teeth of the first insulating frame is equal to the gap value of the extension portions of two adjacent insulating teeth of the second insulating frame.

[0267] The structures of the first insulating frame and the second insulating frame are further defined. When the insulating teeth of the first insulating frame are provided with extensions, and the insulating teeth of the second insulating frame are provided with extensions, the gap value of the extensions of two adjacent insulating teeth of the first insulating frame is equal to the gap value of the extensions of two adjacent insulating teeth of the second insulating frame along the circumference of the stator core 100. In this way, the processing difficulty of the first insulating frame and the second insulating frame is reduced, production is facilitated, processing efficiency is improved, and production cost of the product is reduced.

[0268] In addition, this structural arrangement can ensure the balance and consistency of the abutment area between the extension portion of the first insulating frame and the extension portion of the second insulating frame and the slot insulating paper, which is beneficial to improving the effectiveness and feasibility of preventing the slot insulating paper from bulging inwardly.

[0269] Optionally, d2>d1≥d01.

[0270] The stator core 100 includes a punching sheet group with different slot widths of the stator slot 150, and the smaller value d1 of the slot width is greater than or equal to the gap value d01 of the extension of two adjacent insulating teeth. The first punching sheet group 110 and the extension can cooperate to effectively block the slot insulation paper and prevent the slot insulation paper from protruding from the inner diameter of the stator core 100. The second punching sheet group 120 and the first punching sheet group 110 can cooperate to reduce magnetic leakage, improve the output torque of the motor 1, improve the high-frequency overload capacity of the motor 1, and help improve the performance of the motor 1 and the reliability of the motor 1.

[0271] It can be understood that the second punching sheet group 120 is closer to the end of the stator core 100 than the first punching sheet group 110, that is, the distance from the second punching sheet group 120 to the end of the stator core 100 is smaller than the distance from the first punching sheet group 110 to the end of the stator core 100, that is, along the circumference of the stator core 100, the punching sheet group with a smaller slot width is closer to the middle of the stator core 100. In this way, the slot insulation paper of the stator 10 can be effectively blocked to prevent the slot insulation paper from protruding from the inner diameter of the stator core 100, and the reliability of the motor 1 can be improved.

[0272] Optionally, the rotor core 310 includes multiple pole center lines, each slot group 340 is located at a pole center line, a portion of the slots 342 of the slot group 340 are located on the windward side of the pole center line, and another portion of the slots 342 of the slot group 340 are located on the leeward side of the pole center line.

[0273] The rotor core 310 includes a plurality of magnetic pole center lines, and any of the plurality of magnetic pole center lines has a windward side and a leeward side.

[0274] For example, a line connecting the center of the magnet slot group 330 and the center of the shaft hole 320 of the rotor core 310 constitutes a magnetic pole center line, which is referred to as the d-axis.

[0275] It can be understood that the rotor 30 rotates in the direction from the leeward side of the magnetic pole centerline to the windward side of the magnetic pole centerline. It can also be said that the windward side of the magnetic pole centerline is the leading side of the magnetic pole centerline, and the leeward side of the magnetic pole centerline is the lagging side of the magnetic pole centerline.

[0276] By reasonably setting the matching structure of the odd number of slits 342 of the slit group 340 and the magnetic pole center line, a part of the slits 342 of the slit group 340 are located on the windward side of the magnetic pole center line, and another part of the slits 342 of the slit group 340 are located on the leeward side of the magnetic pole center line. That is, the slits 342 are arranged on both the windward side and the leeward side of the magnetic pole center line. In other words, the arrangement positions of the odd number of slits 342 of the slit group 340 relative to the magnetic pole center line are divided. Since the number of slits 342 in each slit group 340 is an odd number, and the odd number of slits 342 are distributed on opposite sides of the magnetic pole center line (i.e., the windward side of the magnetic pole center line and the leeward side of the magnetic pole center line), then the windward side of the magnetic pole center line is arranged with an even number of slits 342, and the leeward side of the magnetic pole center line is arranged with an odd number of slits 342, or the windward side of the magnetic pole center line is arranged with an odd number of slits 342, and the leeward side of the magnetic pole center line is arranged with an even number of slits 342. In other words, the odd number of slits 342 of the slit group 340 are arranged asymmetrically along the corresponding magnetic pole center line.

[0277] Optionally, the number of slit groups 340 is an even number, the number of magnet slot groups 330 is an even number, the number of slit groups 340 matches the number of magnet slot groups 330, and each magnet slot group 330 cooperates with one slit group 340. The straight line where the center line of the magnetic pole is located cooperates with two slit groups 340, and the two slit groups 340 are respectively recorded as the first slit group and the second slit group, and the axis of the rotor core 310 is located between the first slit group and the second slit group. After the first slit group 340 rotates 180° along the rotation direction of the rotor 30, the slits 342 of the first slit group overlap with the slits 342 of the second slit group. Similarly, after the second slit group rotates 180° along the rotation direction of the rotor 30, the slits 342 of the second slit group overlap with the slits 342 of the first slit group.

[0278] This arrangement ensures that the center of mass of the rotor 30 will not deviate from the center of rotation during the rotation process, and the dynamic balance of the motor 1 can be maintained. There will be no phenomenon of increased local wear, and the noise improvement effect is obvious.

[0279] Taking the 12-slot 8-pole motor 1 as an example, the odd number of slits 342 of the slit group 340 are asymmetrically arranged along the center line of the magnetic pole, and the radial force density of the 4th order 16-fold mechanical frequency is reduced by 53%. The noise in this frequency band of the compressor 4 is reduced by 5dB, and the noise improvement effect is obvious.

[0280] Optionally, the number of the slits 342 located on the windward side is greater than the number of the slits 342 located on the leeward side. This arrangement is beneficial for reducing the no-load cogging torque and load electromagnetic torque pulsation of the motor 1.

[0281] Optionally, the number of slits 342 located on the windward side is an even number, and the number of slits 342 located on the leeward side is an odd number. This setting can meet the use requirements of the odd number of slits 342 of the slit group 340 being arranged asymmetrically with the corresponding magnetic pole center line. This setting can ensure that the waveform of the air gap magnetic density of the motor 1 under load conditions is close to a sine wave, thereby reducing the torque pulsation during the operation of the motor 1. Improve the vibration noise during the operation of the motor 1. At the same time, this setting can ensure the dynamic balance of the rotor 30 during the rotation process, reduce the swing of the shaft structure of the compressor 4, 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 iron loss of the stator 10 of the motor 1 is reduced, which is conducive to improving the operating efficiency of the motor 1, and on the other hand, it can improve the vibration noise of the motor 1, thereby reducing the operating noise of the compressor 4.

[0282] Optionally, each slit group 340 includes a plurality of first slits and a first slit, the plurality of first slits are symmetrically arranged with the magnetic pole center line as the symmetry axis, and the first slit is located on one side of the plurality of first slits. This arrangement can meet the use requirement that the odd number of slits 342 of the slit group 340 are asymmetrically arranged with the corresponding magnetic pole center line.

[0283] Specifically, the two first slits are symmetrically arranged with the center line of the magnetic pole as the axis of symmetry. Each first slit includes a first end and a second end. The first ends of the two first slits are adjacent to each other, the second ends of the two first slits are far away from each other, and the second end is located between the first end and the magnet slot group 330. That is, the two first slits are configured into an "eight"-shaped structure. And the angle formed between the two first slits is recorded as α, and the angle α is an acute angle. This arrangement reasonably utilizes the existing arrangement structure of the core body to ensure the occupancy rate of the slit group 340 to the core body.

[0284] Specifically, the magnet slot includes two slot bodies, each of which includes a third end and a fourth end. The third ends of the two slot bodies are far away from each other, and the fourth ends of the two slot bodies are close to each other, and the fourth end is located between the third end and the axis of the rotor core 310. That is, the two slot bodies are configured in a "V" shape. The angle formed between the first slit and the slot body on the same side of the magnetic pole centerline is recorded as β, and the angle β is an acute angle.

[0285] The stator teeth include a tooth body and a tooth shoe, wherein the tooth body extends in the radial direction of the rotor core 310, the tooth shoe is connected to the tooth body, and the tooth shoe is located at the circumferential end surface of the tooth body. Along the circumference of the rotor core 310, the width of the tooth body is Bt.

[0286] The width of the permanent magnet 350 along the circumferential direction of the rotor core 310 is denoted as H.

[0287] By reasonably setting the angle α formed between the two first slits, the angle β formed between the first slit on the same side of the magnetic pole centerline and the slot body, the circumferential width H of the permanent magnet 350 and the circumferential width Bt of the tooth body, the relationship satisfies: H<α / β×Bt≤3.4mm, and 1.5mm≤H≤2mm. This setting can reduce the no-load tooth slot torque of the motor 1 and reduce the load torque pulsation. At the same time, this setting can ensure that the magnetic field at the stator core 100 will not be oversaturated, which is beneficial to improving the output capacity of the motor 1.

[0288] Optionally, the first slit is located on the windward side of the center line of the magnetic pole. The number of slits 342 located on the windward side of the center line of the magnetic pole is greater than the number of slits 342 located on the leeward side of the center line of the magnetic pole. This setting can ensure that the waveform of the air gap magnetic density of the motor 1 under load conditions is close to a sine wave, thereby reducing the torque pulsation during the operation of the motor 1. Improve the vibration noise during the operation of the motor 1. At the same time, this setting can ensure the dynamic balance of the rotor 30 during the rotation process, reduce the swing of the shaft structure of the compressor 4, 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 iron loss of the stator 10 of the motor 1 is reduced, which is beneficial to improving the operating efficiency of the motor 1. On the other hand, it can improve the vibration noise of the motor 1, thereby reducing the operating noise of the compressor 4.

[0289] Optionally, the first slit on the windward side is arranged adjacent to the pole centerline, and the first slit is located on the side of the first slit away from the pole centerline. The first slit is located on the outside of the first slit. In other words, the first slit is closer to the pole centerline than the first slit. The load of the compressor 4 is not constant, but changes periodically. The first slit is located on the outside of the first slit, which is more conducive to making the waveform of the air gap magnetic density of the motor 1 close to the sine under the load condition, thereby reducing the torque pulsation during the operation of the motor 1 and improving the vibration noise during the operation of the motor 1. At the same time, the asymmetric structural form can ensure the dynamic balance of the rotor 30 during the rotation process, reduce the swing of the compressor 4 shaft system structure, and can effectively improve the content of each harmonic of the air gap magnetic density of the motor 1.

[0290] Optionally, the first slit is closer to the magnetic pole centerline than the first slit. That is, the first slit is arranged close to the magnetic pole centerline, and the first slit is arranged away from the magnetic pole centerline. It can also be said that the distance from the first slit to the magnetic pole centerline is less than the distance from the first slit located on the windward side to the magnetic pole centerline, and the first slit is located on the inner side of the first slit.

[0291] The load of the compressor 4 is not constant but changes periodically. This setting makes the waveform of the air gap magnetic flux of the motor 1 close to the sine under the load condition, thereby reducing the torque pulsation during the operation of the motor 1 and improving the vibration noise during the operation of the motor 1. At the same time, the asymmetric structural form can ensure the dynamic balance of the rotor 30 during the rotation process, reduce the swing of the shaft structure of the compressor 4, and effectively improve the content of each harmonic of the air gap magnetic flux of the motor 1.

[0292] Optionally, Mp, Mc, Ub and X% satisfy: 0.14×Ke≤(Mp / Mc)×Ub×X%≤0.69×Ke. In this way, the cost performance of the motor 1 can be improved while reducing the influence of the armature reaction when the motor 1 is loaded, and enhancing the load capacity of the motor 1 at high speed and weak magnetic field.

[0293] Optionally, the weight of the rotor core 310 is recorded as Mr, wherein 0.17≤Mp / Mr≤0.26. This can ensure that the permanent magnetic field strength of the rotor 30 is within a reasonable range, which is beneficial to improving the torque output capacity of the motor 1.

[0294] Optionally, the slit group 340 includes two first slits, the two first slits are symmetrically arranged with the magnetic pole center line as the symmetry axis, the first slit includes a first end and a second end, the first ends of the two first slits are adjacent to each other, the second ends of the two first slits are far away from each other, the second end is located between the first end and the magnet slot group 330, and the angle formed between the two first slits is recorded as α; the magnet slot group 330 includes two slot bodies, the slot body includes a third end and a fourth end, the third ends of the two slot bodies are far away from each other, the fourth ends of the two slot bodies are adjacent to each other, and the fourth end is located between the third end and the axis of the rotor core 310; the angle formed between the first slit and the slot body located on the same side of the magnetic pole center line is recorded as β; the stator tooth includes a tooth body and a tooth shoe, the tooth shoe is connected to the circumferential end face of the tooth body, and the circumferential width of the tooth body is recorded as Bt; the circumferential width of the permanent magnet 350 is recorded as H; wherein, H<α / β×Bt≤3.4mm, 1.5mm≤H≤2mm.

[0295] Specifically, the slit group 340 includes two first slits, and the two first slits are symmetrically arranged with the magnetic pole center line as the symmetry axis. Each first slit includes a first end and a second end. The first ends of the two first slits are adjacent to each other, and the second ends of the two first slits are far away from each other, and the second end is located between the first end and the magnet slot group 330. That is, the two first slits are configured into an "eight"-shaped structure. And the angle formed between the two first slits is recorded as α, and the angle α is an acute angle.

[0296] Specifically, the magnet slot group 330 includes two slot bodies, each of which includes a third end and a fourth end. The third ends of the two slot bodies are far away from each other, and the fourth ends of the two slot bodies are close to each other, and the fourth end is located between the third end and the axis of the rotor core 310. That is, the two slot bodies are configured in a "V" shape. The angle formed between the first slit on the same side of the magnetic pole centerline and the slot body is recorded as β, and the angle β is an acute angle.

[0297] The stator teeth include a tooth body and a tooth shoe, wherein the tooth body extends in the radial direction of the rotor core 310, the tooth shoe is connected to the tooth body, and the tooth shoe is located at the circumferential end surface of the tooth body. Along the circumference of the rotor core 310, the width of the tooth body is Bt.

[0298] The width of the permanent magnet 350 along the circumferential direction of the rotor core 310 is denoted as H.

[0299] By reasonably setting the angle α formed between the two first slits, the angle β formed between the first slit on the same side of the magnetic pole centerline and the slot body, the circumferential width H of the permanent magnet 350 and the circumferential width Bt of the tooth body, the relationship satisfies: H<α / β×Bt≤3.4mm, and 1.5mm≤H≤2mm. This setting can reduce the no-load tooth slot torque of the motor 1 and reduce the load torque pulsation. At the same time, this setting can ensure that the magnetic field at the stator core 100 will not be oversaturated, which is beneficial to improving the output capacity of the motor 1.

[0300] Optionally, the residual magnetic flux density Br of the permanent magnet 350 at 20°C satisfies: 1.2T≤Br≤1.5T. This setting can ensure that the magnetic field strength of the rotor 30 is within a reasonable range. Since the magnetic field of the rotor 30 is not adjustable, if the residual magnetic flux density Br of the permanent magnet 350 at 20°C is greater than 1.5T, the high-speed weak magnetic operation of the motor 1 will be limited. If the residual magnetic flux density Br of the permanent magnet 350 at 20°C is lower than 1.2T, the motor 1 cannot provide sufficient output capacity.

[0301] Optionally, the intrinsic coercive force Hcj of the permanent magnet 350 at 20°C satisfies: 21.3kOe≤Hcj≤25.2kOe. The intrinsic coercive force of the permanent magnet 350 is a key indicator for measuring the anti-demagnetization ability of the permanent magnet 350. If Hcj is less than 21.3kOe, the anti-demagnetization ability of the permanent magnet 350 is weak, and irreversible demagnetization will occur during the operation of the motor 1. If Hcj is greater than 25.2kOe, the use of heavy rare earth will increase, the cost will increase sharply, and it is not conducive to improving the cost performance of the motor 1.

[0302] In this application, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like 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 the specific circumstances.

[0303] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A stator core, characterized in that: include: The first punching group; A second punching sheet group, which is stacked on one side of the first punching sheet group along the axial direction of the stator core, and the second punching sheet group is closer to the end of the stator core than the first punching sheet group; Either the first punching sheet group or the second punching sheet group comprises an annular yoke and a plurality of teeth, each of the teeth is connected to the inner peripheral wall of the annular yoke, the plurality of teeth are arranged at intervals around the axis of the stator core, and two adjacent teeth and the annular yoke enclose a stator slot; Along the circumferential direction of the stator core, the slot width of the stator slots of the first punching sheet group is recorded as d1, and the slot width of the stator slots of the second punching sheet group is recorded as d2, wherein 1<d2 / d1<3.

2. The stator core according to claim 1, characterized in that: The d1 and the d2 satisfy: 1.5<d2 / d1<3.

3. The stator core according to claim 1 or 2, characterized in that: The number of the first punching sheet groups is recorded as m, the number of the second punching sheet groups is recorded as n, and one first punching sheet group is arranged between any two adjacent second punching sheet groups; Among them, m≥1, n≥2.

4. The stator core according to claim 3, characterized in that: The axial height of the first punching sheet group is denoted as h1, and the axial height of the second punching sheet group is denoted as h2, wherein 0.05<(m×h1) / (n×h2)<0.

2.

5. The stator core according to claim 1 or 2, characterized in that: Also includes: a third punching sheet group, wherein the second punching sheet group is located between the first punching sheet group and the third punching sheet group; The third punching sheet group includes the annular yoke and the plurality of teeth. Along the circumferential direction of the stator core, the slot width of the stator slot of the third punching sheet group is denoted as d3, wherein d3>d2>d1.

6. The stator core according to claim 5, characterized in that: Along the axial direction of the stator core, the orthographic projection of the slot wall of the stator slot of the third punching sheet group on the second punching sheet group is located outside the slot wall of the stator slot of the second punching sheet group.

7. The stator core according to claim 5, characterized in that: The wall surface of the tooth portion facing the axis of the stator core is the tooth surface; The tooth surface of at least one of the first punching sheet group, the second punching sheet group and the third punching sheet group includes an arc segment and a connecting segment, wherein the connecting segment is connected to one side of the arc segment in the circumferential direction of the stator core, and the arc segment is closer to the axis of the stator core than the connecting segment.

8. The stator core according to claim 7, characterized in that: The connecting segment includes any one of the following or a combination thereof: a plane segment, a folded surface segment and a curved surface segment.

9. The stator core according to claim 1 or 2, characterized in that: The distance from the axis of the stator core to the end surface of the tooth portion away from the annular yoke portion is recorded as D1, and the distance from the axis of the stator core to the outer peripheral wall of the annular yoke portion is recorded as D2, wherein 0.6≤D1 / D2≤0.

7.

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

11. A motor, characterized in that: include: The stator according to claim 10, wherein a plurality of teeth of the stator core enclose an assembly cavity; A rotor is rotatably arranged in the assembly cavity.

12. The motor according to claim 11, characterized in that The rotor comprises: A rotor core, arranged in the assembly cavity; An axial hole, provided in the rotor core; A plurality of magnet slot groups are provided on the rotor core, and the plurality of magnet slot groups are arranged at intervals around the shaft hole; A plurality of slot groups are provided on the rotor core, one slot group is arranged between each magnet slot group and the outer peripheral wall of the rotor core, and the slot group includes an odd number of slots.

13. The motor according to claim 12, characterized in that The rotor further comprises a plurality of permanent magnets, each of the magnet slot groups is provided with one permanent magnet, and the permanent magnets contain X% cerium by mass; The stator further comprises a winding and a plurality of stator teeth, wherein the winding is wound on the plurality of stator teeth; The weight of the multiple permanent magnets is denoted as Mp, the weight of the winding is denoted as Mc, the back electromotive force value of the motor at a rotation speed of 1000 rpm is denoted as Ke, and the maximum allowable operating voltage of the power device of the controller of the motor is denoted as Ub, wherein (Mp / Mc)×Ub×X%≤Ke.

14. The motor according to claim 13, characterized in that The mass percentage of cerium in the permanent magnet satisfies: 2%<X%<8%.

15. The electric machine according to any one of claims 11 to 14, characterized in that Along the radial direction of the rotor, the value of the minimum gap from the outer circumferential wall of the rotor to the inner circumferential wall of the stator is denoted as δ, wherein 0.08<δ / d2<0.

15.

16. A compressor, characterized in that: include: A motor as claimed in any one of claims 11 to 15.

17. A vehicle, characterized in that: include: The compressor of claim 16.

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