Rotor core, rotor, motor, compressor and vehicle

Abstract

The invention provides a rotor core, a rotor, a motor, a compressor and a vehicle. The rotor iron core comprises an iron core body, the shaft hole is formed in the iron core body; the plurality of magnet groove groups are arranged on the iron core body, and the plurality of magnet groove groups are arranged around the shaft hole at intervals; and the plurality of slit groups are arranged on the iron core body, one slit group is arranged between each magnet groove group and the peripheral wall of the iron core body, and each slit group comprises an odd number of slits.

Description

Technical Field

[0001] The present application relates to the technical field of electric motors, and in particular to a rotor core, a rotor, an electric 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 rotor core of the motor includes a slot group, the slot group includes an even number of slots, and the even number of slots are symmetrically arranged with the magnetic pole center line as the symmetry axis. The motor with this arrangement has a large running noise. 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 rotor core.

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

[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 rotor core, comprising: a core body; an axial hole, arranged in the core body; a plurality of magnet slot groups, arranged in the core body, and the plurality of magnet slot groups are arranged at intervals around the axial hole; a plurality of slit groups, arranged in the core body, a slit group is arranged between each magnet slot group and the outer peripheral wall of the core body, and the slit group includes an odd number of slits.

[0010] The present application provides a rotor core comprising a core body, an axial hole, a plurality of magnet slot groups and a plurality of slot groups.

[0011] A plurality of magnet slot groups are arranged around the shaft hole at intervals, and the magnet slot groups are used to install permanent magnets to form magnetic poles.

[0012] A plurality of slit groups are arranged at intervals around the shaft hole.

[0013] A slit group is arranged between each magnet slot group and the outer peripheral wall of the core body.

[0014] The slit group includes an odd number of slits.

[0015] The rotor core is applied to the motor, and the motor is applied to the compressor. Since the compressor is a pulsating load, the structure of the rotor core is reasonably set so that the slit group on the rotor core includes an odd number of slits, that is, the number of slits included in each slit group is an odd number. At least a part of the odd number of slits in each slit group is arranged asymmetrically. The odd number of slits matches the pulsating load of the compressor, making the output torque of the product more stable. 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.

[0016] The rotor core described above in the present application may also have the following additional technical features:

[0017] In some embodiments, optionally, the core body includes multiple pole center lines, each slot group is located at a pole center line, a portion of the slots in the slot group are located on the windward side of the pole center line, and another portion of the slots in the slot group are located on the leeward side of the pole center line.

[0018] In this embodiment, the core body includes a plurality of magnetic pole center lines, and any magnetic pole center line among the plurality of magnetic pole center lines has a windward side and a leeward side.

[0019] For example, a line connecting the center of the magnet slot group and the center of the axial hole of the core body constitutes a magnetic pole center line, which is referred to as the d-axis.

[0020] It can be understood that the rotor 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.

[0021] By reasonably setting the matching structure of the odd number of slits in the slit group and the magnetic pole center line, a part of the slits in the slit group are located on the windward side of the magnetic pole center line, and the other part of the slits in the slit group are located on the leeward side of the magnetic pole center line. That is, slits 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 in the slit group relative to the magnetic pole center line are divided. Since the number of slits in each slit group is odd, and the odd number of slits are distributed on the opposite sides of the magnetic pole center line (that is, the windward side and the leeward side of the magnetic pole center line), then, an even number of slits are arranged on the windward side of the magnetic pole center line, and an odd number of slits are arranged on the leeward side of the magnetic pole center line, or an odd number of slits are arranged on the windward side of the magnetic pole center line, and an even number of slits are arranged on the leeward side of the magnetic pole center line. In other words, the odd number of slits in the slit group are arranged asymmetrically along the corresponding magnetic pole center line.

[0022] Optionally, the number of slit groups is an even number, the number of magnet slot groups is an even number, the number of slit groups matches the number of magnet slot groups, and each magnet slot group cooperates with a slit group. The straight line where the center line of the magnetic pole is located cooperates with two slit groups, and the two slit groups are respectively recorded as the first slit group and the second slit group, and the axis of the rotor core is located between the first slit group and the second slit group. After the first slit group rotates 180° in the rotation direction of the rotor, the slits of the first slit group overlap with the slits of the second slit group. Similarly, after the second slit group rotates 180° in the rotation direction of the rotor, the slits of the second slit group overlap with the slits of the first slit group.

[0023] This setting ensures that the center of mass of the rotor will not deviate from the center of rotation during rotation, and the dynamic balance of the motor can be maintained. There will be no phenomenon of increased local wear. The noise improvement effect is obvious.

[0024] Taking a 12-slot 8-pole motor as an example, the odd-numbered slits in the slit group are asymmetrically arranged along the center line of the magnetic pole. The radial force density of the 4th-order 16th-fold mechanical frequency is reduced by 53%, and the noise in this frequency band of the compressor is reduced by 5dB, with obvious noise improvement effect.

[0025] In some embodiments, optionally, the number of the slits located on the windward side is greater than the number of the slits located on the leeward side.

[0026] In this embodiment, the matching structure of the odd number of slots in each slot group and the magnetic pole center line is further defined, so that the number of slots located on the windward side of the magnetic pole center line is greater than the number of slots located on the leeward side of the magnetic pole center line. This setting is conducive to reducing the no-load cogging torque and load electromagnetic torque pulsation of the motor.

[0027] In some embodiments, optionally, the number of the slits located on the windward side is an even number, and the number of the slits located on the leeward side is an odd number.

[0028] In this embodiment, the coordination structure of the odd number of slots in each slot group and the magnetic pole center line is further limited so that the number of slots on the windward side is an even number, the number of slots on the leeward side is an odd number, and the number of slots on the windward side is greater than the number of slots on the leeward side.

[0029] This setting can meet the use requirements of the odd number of slits in the slit group 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 under load conditions is close to sine, thereby reducing the torque pulsation during the operation of the motor. Improve the vibration noise during the operation of the motor. At the same time, this setting can ensure the dynamic balance of the rotor during rotation, reduce the swing of the shaft structure of the compressor, and can effectively improve the content of each harmonic of the air gap magnetic density of the motor. In this way, on the one hand, the stator iron loss of the motor is reduced, which is conducive to improving the operating efficiency of the motor. On the other hand, it can improve the vibration noise of the motor, thereby reducing the operating noise of the compressor.

[0030] In some embodiments, optionally, each slit group includes a plurality of first slits and a second slit, the plurality of first slits are symmetrically arranged with the magnetic pole center line as the symmetry axis, and the second slit is located on one side of the plurality of first slits.

[0031] In this embodiment, the structure of the slit group is further defined, so that each slit group includes a plurality of first slits and a second slit, the plurality of first slits are symmetrically arranged with the magnetic pole center line as the symmetry axis, and the second slit is located on one side of the plurality of first slits. This arrangement can meet the use requirement that an odd number of slits in the slit group are asymmetrically arranged with the corresponding magnetic pole center line.

[0032] Specifically, the two first slits are symmetrically arranged with the center line of the magnetic pole 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, 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. 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 to the core body.

[0033] 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, 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. 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.

[0034] The stator teeth include a tooth body and a tooth shoe, wherein the tooth body extends in the radial direction of the rotor core, 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, the width of the tooth body is Bt.

[0035] The width of the permanent magnet along the circumference of the rotor core is denoted by H.

[0036] 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 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 and reduce the load torque pulsation. At the same time, this setting can ensure that the magnetic field at the stator core will not be oversaturated, which is beneficial to improving the output capacity of the motor.

[0037] In some embodiments, optionally, the second slit is located on the windward side of the pole centerline.

[0038] In this embodiment, the slit group includes a plurality of first slits and a second slit. The plurality of first slits are symmetrically arranged with the magnetic pole center line as a symmetry axis, and the second slit is located on the windward side of the magnetic pole center line.

[0039] That is to say, the number of slits located on the windward side of the center line of the magnetic pole is greater than the number of slits 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 under load conditions is close to a sine wave, thereby reducing the torque pulsation during the operation of the motor. Improve the vibration noise during the operation of the motor. At the same time, this setting can ensure the dynamic balance of the rotor during rotation, reduce the swing of the shaft structure of the compressor, and can effectively improve the content of each harmonic of the air gap magnetic density of the motor. In this way, on the one hand, the stator iron loss of the motor is reduced, which is conducive to improving the operating efficiency of the motor. On the other hand, it can improve the vibration noise of the motor, thereby reducing the operating noise of the compressor.

[0040] In some embodiments, optionally, the first slit located on the windward side is arranged close to the center line of the magnetic pole, and the second slit is located on the side of the first slit away from the center line of the magnetic pole.

[0041] In this embodiment, the matching structure of the first slit and the second slit on the windward side is further defined, so that the first slit on the windward side is arranged close to the magnetic pole center line, and the second slit is located on the side of the first slit away from the magnetic pole center line. That is, the second slit is located outside the first slit. In other words, the first slit is closer to the magnetic pole center line than the second slit.

[0042] The load of the compressor is not constant, but changes periodically. The second slit is located outside the first slit, which is more conducive to making the waveform of the motor air gap magnetic density close to sine under the load condition, thereby reducing the torque pulsation during the operation of the motor and improving the vibration noise during the operation of the motor. At the same time, the asymmetric structure can ensure the dynamic balance of the rotor during rotation, reduce the swing of the compressor shaft structure, and effectively improve the content of each harmonic of the motor air gap magnetic density.

[0043] In some embodiments, optionally, the second slit is closer to the magnetic pole centerline than the first slit.

[0044] In this embodiment, the matching structure of the first slit and the second slit located on the windward side is further defined, so that the second slit is closer to the magnetic pole center line than the first slit. That is, the second slit is arranged close to the magnetic pole center line, and the first slit is arranged away from the magnetic pole center line. It can also be said that the distance from the second slit to the magnetic pole center line is less than the distance from the first slit located on the windward side to the magnetic pole center line, and the second slit is located on the inner side of the first slit.

[0045] The load of the compressor is not constant, but changes periodically. This setting makes the waveform of the motor air gap flux density close to sine under the load condition, thereby reducing the torque pulsation during the operation of the motor and improving the vibration noise during the operation of the motor. At the same time, the asymmetric structure can ensure the dynamic balance of the rotor during rotation, reduce the swing of the compressor shaft structure, and effectively improve the content of each harmonic of the motor air gap flux density.

[0046] In some embodiments, optionally, the shape of the first slit located on the windward side is different from the shape of the first slit located on the leeward side.

[0047] In this embodiment, the shapes of the plurality of first slits are further defined so that the shape of the first slit on the windward side is different from the shape of the first slit on the leeward side, thus having a foolproof effect and being able to effectively identify the windward side and the leeward side of the magnetic pole centerline.

[0048] In some embodiments, optionally, the shape of the first slit located on the windward side is the same as the shape of the first slit located on the leeward side.

[0049] In this embodiment, the shapes of the plurality of first slits are further limited so that the shapes of the first slits on the windward side are the same as the shapes of the first slits on the leeward side. In this way, the processing is convenient, the processing difficulty of the die is simplified, and the production cost of the rotor core is reduced.

[0050] The second aspect of the present application proposes a rotor, comprising: a plurality of permanent magnets; and a rotor core as in any technical solution of the first aspect, wherein a permanent magnet is arranged in each magnet slot group.

[0051] The rotor provided in the present application includes a plurality of permanent magnets and a rotor core. Since it includes a rotor core as in any technical solution in the first aspect, it has all the beneficial effects of the above-mentioned rotor core, which will not be described one by one here.

[0052] The third aspect of the present application provides a motor, comprising: a stator, the stator comprising a stator core, the stator core being provided with an assembly cavity; and a rotor as in the second aspect, the rotor being rotatably disposed in the assembly cavity.

[0053] The motor provided in the present application includes a stator and a rotor. Since it includes the rotor as in the second aspect, it has all the beneficial effects of the above-mentioned rotor, which will not be described one by one here.

[0054] In the above technical scheme, further, on the axial end face of the rotor core, there is an inter-pole center line between adjacent magnet slot groups in the multiple magnet slot groups; along the radial direction of the rotor, the value of the minimum gap between the outer circumferential wall of the rotor and the inner circumferential wall of the stator is denoted as gmin, and the minimum gap is located at the magnetic pole center line of the core body, the value of the maximum gap between the outer circumferential wall of the rotor and the inner circumferential wall of the stator is denoted as gmax, and the maximum gap is located at the limit center line; wherein, 0.6≤gmin / gmax≤0.8.

[0055] In this embodiment, the structure of the rotor is further defined, wherein, on the axial end surface of the rotor core, there is an inter-pole center line between adjacent magnet slot groups among the plurality of magnet slot groups.

[0056] The value of the minimum gap between the outer peripheral wall of the rotor and the inner peripheral wall of the stator in the radial direction of the rotor is recorded as gmin, and the value of the maximum gap between the outer peripheral wall of the rotor and the inner peripheral wall of the stator in the radial direction of the rotor is recorded as gmax. The relationship between gmin and gmax is limited to satisfy 0.6≤gmin / gmax≤0.8. This setting can further optimize the back EMF waveform of the motor, improve the torque pulsation under the load condition of the motor, and has the effect of improving the running noise of the motor and the compressor.

[0057] Specifically, the center line between poles is also called the center line of adjacent magnetic poles, referred to as the q-axis.

[0058] Optionally, gmin / gmax=0.62, gmin / gmax=0.64, gmin / gmax=0.66, gmin / gmax=0.68, gmin / gmax=0.7, gmin / gmax=0.72, gmin / gmax=0.74, gmin / gmax=0.76 and gmin / gmax=0.78, etc., which are not listed here one by one.

[0059] In some embodiments, optionally, the inner diameter of the stator core is denoted as D1, and the outer diameter of the stator core is denoted as D2, wherein 0.6≤D1 / D2≤0.7.

[0060] In this embodiment, the structure of the stator core is further defined, so that the inner diameter of the stator core is recorded as D1, and the outer diameter of the stator core is recorded as D2, wherein D1 and D2 satisfy 0.6≤D1 / D2≤0.7.

[0061] 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.

[0062] 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 can be increased and the power density of the motor can be improved.

[0063] If the ratio of D1 to D2 is greater than 0.7, the area of ​​the stator slots of the stator will be reduced, causing the magnetic flux of the stator teeth and yoke of the stator to be saturated, and the armature flux will be sharply reduced, resulting in deterioration of the output power of the motor.

[0064] 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.

[0065] 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.

[0066] In some embodiments, optionally, the stator core includes: 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 includes an annular yoke and a plurality of teeth, each tooth being connected to the inner circumferential wall of the annular yoke, and the plurality of teeth being arranged at intervals around the axis of the stator core, and any 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 slot of the first punching sheet group is denoted as d1, and the slot width of the stator slot of the second punching sheet group is denoted as d2, wherein 1<d2 / d1<3.

[0067] In this embodiment, the stator core includes a first punching sheet group and a second punching sheet group.

[0068] 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.

[0069] 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, and any two adjacent teeth and the annular yoke enclose a stator slot.

[0070] 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. Any two adjacent teeth and the annular yoke enclose a stator slot.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] In some embodiments, optionally, the permanent magnets of the rotor contain X% cerium by mass; the stator also includes a winding, the stator core includes a plurality of stator teeth, the plurality of stator teeth are arranged at intervals around the axis of the stator core, the plurality of stator teeth enclose an assembly cavity, 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.

[0077] In this embodiment, the electric machine includes a rotor and a stator.

[0078] The rotor comprises a rotor core and a plurality of permanent magnets. The rotor core is provided with a plurality of magnet slot groups. Each magnet slot group is provided with a permanent magnet. The permanent magnet contains X% of cerium by mass.

[0079] The stator comprises a stator core and a winding. The stator core comprises a plurality of stator teeth, and the winding is wound on the plurality of stator teeth.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] The fourth aspect of the present application proposes a compressor, comprising: a motor as in any technical solution in the third aspect.

[0088] The compressor provided in the present application includes a motor. Since it includes a motor as in any technical solution in the third aspect, it has all the beneficial effects of the above-mentioned motors, which will not be stated one by one here.

[0089] A fifth aspect of the present application provides a vehicle, comprising: a compressor as in the fourth aspect.

[0090] The vehicle provided in the present application includes a compressor. Since it includes a compressor as in the fourth aspect, it has all the beneficial effects of the above-mentioned compressor, which will not be stated one by one here.

[0091] 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.

[0092] 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

[0093] 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:

[0094] Figure 1 A schematic structural diagram of a rotor core according to a first embodiment of the present application is shown;

[0095] Figure 2 A schematic structural diagram of a rotor core according to a second embodiment of the present application is shown;

[0096] Figure 3 A schematic structural diagram of a rotor core according to a third embodiment of the present application is shown;

[0097] Figure 4A partial structural schematic diagram of a motor according to an embodiment of the present application is shown;

[0098] Figure 5 A schematic structural diagram of a stator core from a first perspective of an embodiment of the present application is shown;

[0099] Figure 6 A schematic structural diagram of a stator core from a second perspective of an embodiment of the present application is shown;

[0100] Figure 7 A schematic structural diagram of a compressor according to an embodiment of the present application is shown;

[0101] Figure 8 A schematic diagram showing a comparison of radial force density of the motor of the present application and a motor in the related art is shown;

[0102] Fig. 9 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;

[0103] Fig.10 A schematic diagram showing the variation trend of the output torque and the 2-fold frequency radial force density of a motor according to an embodiment of the present application is shown;

[0104] Fig.11 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;

[0105] Fig.12 A maximum torque variation curve diagram of a motor according to an embodiment of the present application is shown.

[0106] in, Figures 1 to 7 The corresponding relationship between the reference numerals and component names in the figure is:

[0107] 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, 180 assembly cavity, 200 winding, 190 stator tooth, 30 rotor, 310 rotor core, 312 core body, 314 shaft hole, 316 magnet slot group, 320 slit group, 322 slit, 322a first slit, 322b second slit, 330 magnetic pole center line, 332 windward side, 334 leeward side, 340 permanent magnet, 350 inter-pole center line, 4 compressor, 41 cover plate, 42 inverter, 43 drive shaft, 44 suction port, 45 housing, 46 compression part, 47 discharge port. DETAILED DESCRIPTION

[0108] 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.

[0109] 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.

[0110] Refer to the following Figures 1 to 12 A rotor core 310 , a rotor 30 , a motor 1 , a compressor 4 , and a vehicle according to some embodiments of the present application.

[0111] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, according to some embodiments of the present application, a rotor core 310 includes a core body 312 , an axial hole 314 , a plurality of magnet slot groups 316 , and a plurality of slot groups 320 .

[0112] The shaft hole 314 is disposed in the core body 312 .

[0113] A plurality of magnet slot groups 316 are disposed on the core body 312 , and the plurality of magnet slot groups 316 are arranged at intervals around the shaft hole 314 .

[0114] A plurality of slot groups 320 are disposed on the core body 312 , and a slot group 320 is arranged between each magnet slot group 316 and the outer peripheral wall of the core body 312 .

[0115] The slit group 320 includes an odd number of slits 322 .

[0116] In this embodiment, the rotor core 310 includes a core body 312 , a shaft hole 314 , a plurality of magnet slot groups 316 , and a plurality of slot groups 320 .

[0117] A plurality of magnet slot groups 316 are arranged around the shaft hole 314 at intervals, and the magnet slot groups 316 are used to install permanent magnets 340 to form magnetic poles.

[0118] A plurality of slit groups 320 are spaced apart around the shaft hole 314 .

[0119] A slot group 320 is arranged between each magnet slot group 316 and the outer peripheral wall of the core body 312 .

[0120] The slit group 320 includes an odd number of slits 322 .

[0121] The rotor core 310 is applied to the motor 1, and the motor 1 is applied to the compressor 4. Since the compressor 4 is a pulsating load, the structure of the rotor core 310 is reasonably set so that the slot group 320 on the rotor core 310 includes an odd number of slots 322, that is, the number of slots 322 included in each slot group 320 is an odd number. At least a part of the odd number of slots 322 in each slot group 320 is arranged asymmetrically. The odd number of slots 322 matches the pulsating load of the compressor 4, so that the output torque of the product is more stable. 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 the noise and vibration of the compressor 4 can be improved.

[0122] in, Figure 1 , Figure 2 and Figure 3 The arrows in the figures indicate the rotation direction of the rotor 30.

[0123] In some embodiments, Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the core body 312 includes a plurality of magnetic pole centerlines 330 .

[0124] Each slot group 320 is located at a magnetic pole center line 330 .

[0125] A portion of the slots 322 of the slot group 320 is located on a windward side 332 of the magnetic pole center line 330 , and another portion of the slots 322 of the slot group 320 is located on a leeward side 334 of the magnetic pole center line 330 .

[0126] In this embodiment, the core body 312 includes a plurality of pole centerlines 330 , and any pole centerline 330 of the plurality of pole centerlines 330 has a windward side 332 and a leeward side 334 .

[0127] For example, a line connecting the center of the magnet slot group 316 and the center of the axial hole 314 of the core body 312 forms a magnetic pole center line 330 , which is referred to as the d-axis.

[0128] It can be understood that the rotor 30 rotates in the direction from the leeward side 334 of the magnetic pole center line 330 to the windward side 332 of the magnetic pole center line 330. It can also be said that the windward side 332 of the magnetic pole center line 330 is the leading side of the magnetic pole center line 330, and the leeward side 334 of the magnetic pole center line 330 is the lagging side of the magnetic pole center line 330.

[0129] By reasonably setting the matching structure of the odd number of slits 322 of the slit group 320 and the magnetic pole center line 330, a part of the slits 322 of the slit group 320 are located on the windward side 332 of the magnetic pole center line 330, and another part of the slits 322 of the slit group 320 are located on the leeward side 334 of the magnetic pole center line 330. That is, the slits 322 are arranged on both the windward side 332 of the magnetic pole center line 330 and the leeward side 334 of the magnetic pole center line 330. In other words, the arrangement positions of the odd number of slits 322 of the slit group 320 relative to the magnetic pole center line 330 are divided. Since the number of slits 322 in each slit group 320 is an odd number, and the odd number of slits 322 are distributed on opposite sides of the magnetic pole center line 330 (i.e., the windward side 332 of the magnetic pole center line 330 and the leeward side 334 of the magnetic pole center line 330), then the windward side 332 of the magnetic pole center line 330 is arranged with an even number of slits 322, and the leeward side 334 of the magnetic pole center line 330 is arranged with an odd number of slits 322, or the windward side 332 of the magnetic pole center line 330 is arranged with an odd number of slits 322, and the leeward side 334 of the magnetic pole center line 330 is arranged with an even number of slits 322. In other words, the odd number of slits 322 of the slit group 320 are asymmetrically arranged along the corresponding magnetic pole center line 330.

[0130] Optionally, the number of the slit groups 320 is an even number, the number of the magnet slot groups 316 is an even number, the number of the slit groups 320 matches the number of the magnet slot groups 316, and each magnet slot group 316 cooperates with one slit group 320. The straight line where the magnetic pole center line 330 is located cooperates with two slit groups 320, and the two slit groups 320 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 rotates 180° along the rotation direction of the rotor 30, the slits 322 of the first slit group overlap with the slits 322 of the second slit group. Similarly, after the second slit group rotates 180° along the rotation direction of the rotor 30, the slits 322 of the second slit group overlap with the slits 322 of the first slit group.

[0131] 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.

[0132] Taking the 12-slot 8-pole motor 1 as an example, the odd number of slits 322 of the slit group 320 are asymmetrically arranged along the magnetic pole center line 330, 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.

[0133] The slit group in the related art includes an even number of slits, which are symmetrically arranged with the magnetic pole center line as the symmetry axis. The slit group 320 of the present application includes an odd number of slits 322, which are asymmetrically arranged along the corresponding magnetic pole center line 330. Figure 8 As shown, compared with the motor in the related art, the motor 1 of the present application reduces the radial force density, which is beneficial to improving the problem of operating noise of the motor 1.

[0134] In some embodiments, Figure 1 , Figure 2 and Figure 3 As shown, the number of the slits 322 located on the windward side 332 is greater than the number of the slits 322 located on the leeward side 334 .

[0135] In this embodiment, the matching structure of the odd number of slots 322 of each slot group 320 and the magnetic pole center line 330 is further defined, so that the number of slots 322 located on the windward side 332 of the magnetic pole center line is greater than the number of slots 322 located on the leeward side 334 of the magnetic pole center line 330. This arrangement is conducive to reducing the no-load cogging torque and load electromagnetic torque pulsation of the motor 1.

[0136] In some embodiments, Figure 1 , Figure 2 and Figure 3 As shown, the number of the slits 322 located on the windward side 332 is an even number, and the number of the slits 322 located on the leeward side 334 is an odd number.

[0137] In this embodiment, the matching structure of the odd number of slots 322 of each slot group 320 and the magnetic pole center line 330 is further limited, so that the number of slots 322 located on the windward side 332 is an even number, the number of slots 322 located on the leeward side 334 is an odd number, and the number of slots 322 located on the windward side 332 is greater than the number of slots 322 located on the leeward side 334.

[0138] This setting can meet the use requirements of the odd number of slits 322 of the slit group 320 being arranged asymmetrically with the corresponding magnetic pole center line 330. 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. On the other hand, it can improve the vibration noise of the motor 1, thereby reducing the operating noise of the compressor 4.

[0139] In some other embodiments, the number of the slits 322 on the windward side 332 is an odd number, the number of the slits 322 on the leeward side 334 is an even number, and the number of the slits 322 on the windward side 332 is greater than the number of the slits 322 on the leeward side 334 .

[0140] In some embodiments, Figure 1 , Figure 2 and Figure 3 As shown, each slit group 320 includes a plurality of first slits 322a and second slits 322b.

[0141] The plurality of first slits 322 a are symmetrically arranged with the magnetic pole center line 330 as a symmetry axis.

[0142] The second slit 322 b is located at one side of the plurality of first slits 322 a .

[0143] In this embodiment, the structure of the slit group 320 is further defined, so that each slit group 320 includes a plurality of first slits 322a and a second slit 322b, the plurality of first slits 322a are symmetrically arranged with the magnetic pole center line 330 as the symmetry axis, and the second slit 322b is located on one side of the plurality of first slits 322a. This arrangement can meet the use requirement that the odd number of slits 322 of the slit group 320 are asymmetrically arranged with the corresponding magnetic pole center line 330.

[0144] Specifically, the two first slits 322a are symmetrically arranged with the magnetic pole center line 330 as the symmetry axis. Each first slit 322a includes a first end and a second end. The first ends of the two first slits 322a are adjacent to each other, the second ends of the two first slits 322a are far away from each other, and the second end is located between the first end and the magnet slot group 316. That is, the two first slits 322a are configured into an "eight" shaped structure. And the angle formed between the two first slits 322a is recorded as α, and the angle α is an acute angle. This arrangement reasonably utilizes the existing arrangement structure of the core body 312 to ensure the occupancy rate of the slit group 320 to the core body 312.

[0145] 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 322a and the slot body on the same side of the magnetic pole centerline 330 is recorded as β, and the angle β is an acute angle.

[0146] The stator tooth 190 includes 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.

[0147] The width of the permanent magnet 340 along the circumferential direction of the rotor core 310 is denoted as H.

[0148] By reasonably setting the angle α formed between the two first slits 322a, the angle β formed between the first slit 322a on the same side of the magnetic pole centerline 330 and the slot body, the relationship between the circumferential width H of the permanent magnet 340 and the circumferential width Bt of the tooth body 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 conducive to improving the output capacity of the motor 1.

[0149] In some embodiments, Figure 1 , Figure 2 and Figure 3 As shown, the second slit 322 b is located on the windward side 332 of the magnetic pole centerline 330 .

[0150] In this embodiment, the slit group 320 includes a plurality of first slits 322a and a second slit 322b. The plurality of first slits 322a are symmetrically arranged with the magnetic pole center line 330 as a symmetry axis, and the second slit 322b is located on the windward side 332 of the magnetic pole center line 330.

[0151] That is to say, the number of slits 322 located on the windward side 332 of the magnetic pole center line 330 is greater than the number of slits 322 located on the leeward side 334 of the magnetic pole center line 330. 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. On the other hand, it can improve the vibration noise of the motor 1, thereby reducing the operating noise of the compressor 4.

[0152] In this embodiment, the first slit 322 a located on the windward side 332 is parallel to the second slit 322 b .

[0153] In some other embodiments, the first slit 322a located on the windward side 332 is not parallel to the second slit 322b.

[0154] In some embodiments, Figure 1 and Figure 2 As shown, the first slit 322 a located on the windward side 332 is arranged close to the magnetic pole center line 330 .

[0155] The second slit 322 b is located at a side of the first slit 322 a away from the magnetic pole center line 330 .

[0156] In this embodiment, the matching structure of the first slit 322a and the second slit 322b located on the windward side 332 is further defined, so that the first slit 322a located on the windward side 332 is arranged close to the magnetic pole center line 330, and the second slit 322b is located on the side of the first slit 322a away from the magnetic pole center line 330. That is, the second slit 322b is located outside the first slit 322a. In other words, the first slit 322a is closer to the magnetic pole center line 330 than the second slit 322b.

[0157] The load of the compressor 4 is not constant but changes periodically, so that the second slit 322b is located outside the first slit 322a, 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 asymmetrically arranged 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 density of the motor 1.

[0158] In some embodiments, Figure 3 As shown, the second slit 322b is closer to the magnetic pole center line 330 than the first slit 322a.

[0159] In this embodiment, the matching structure of the first slit 322a and the second slit 322b located on the windward side 332 is further defined, so that the second slit 322b is closer to the magnetic pole center line 330 than the first slit 322a. That is, the second slit 322b is arranged close to the magnetic pole center line 330, and the first slit 322a is arranged away from the magnetic pole center line 330. It can also be said that the distance from the second slit 322b to the magnetic pole center line 330 is smaller than the distance from the first slit 322a located on the windward side 332 to the magnetic pole center line 330, and the second slit 322b is located on the inner side of the first slit 322a.

[0160] 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.

[0161] In some embodiments, Figure 2As shown, the shape of the first slit 322 a located on the windward side 332 is different from the shape of the first slit 322 a located on the leeward side 334 .

[0162] In this embodiment, the shapes of the plurality of first slits 322a are further defined so that the shape of the first slits 322a located on the windward side 332 is different from the shape of the first slits 322a located on the leeward side 334, thereby having a foolproof effect. The windward side 332 of the magnetic pole center line 330 and the leeward side 334 of the magnetic pole center line 330 can be effectively identified.

[0163] In some embodiments, Figure 1 and Figure 3 As shown, the shape of the first slit 322 a located on the windward side 332 is the same as the shape of the first slit 322 a located on the leeward side 334 .

[0164] In this embodiment, the shapes of the plurality of first slits 322a are further defined so that the shapes of the first slits 322a on the windward side 332 are the same as the shapes of the first slits 322a on the leeward side 334. In this way, the processing is convenient, the processing difficulty of the die is simplified, and the production cost of the rotor core 310 is reduced.

[0165] like Figure 4 As shown, a rotor 30 according to some other embodiments of the present application includes: a plurality of permanent magnets 340 ; and a rotor core 310 as in any of the above embodiments, wherein each magnet slot group 316 is provided with a permanent magnet 340 .

[0166] In this embodiment, the rotor 30 includes a plurality of permanent magnets 340 and a rotor core 310 .

[0167] The rotor core 310 includes a core body 312 , a shaft hole 314 , a plurality of magnet slot groups 316 , and a plurality of slot groups 320 .

[0168] A plurality of magnet slot groups 316 are arranged around the shaft hole 314 at intervals, and the magnet slot groups 316 are used to install permanent magnets 340 to form magnetic poles.

[0169] A plurality of slit groups 320 are spaced apart around the shaft hole 314 .

[0170] A slot group 320 is arranged between each magnet slot group 316 and the outer peripheral wall of the core body 312 .

[0171] The slit group 320 includes an odd number of slits 322 .

[0172] The rotor core 310 is applied to the motor 1, and the motor 1 is applied to the compressor 4. Since the compressor 4 is a pulsating load, the structure of the rotor core 310 is reasonably set so that the slot group 320 on the rotor core 310 includes an odd number of slots 322, that is, the number of slots 322 included in each slot group 320 is an odd number. The odd number of slots 322 in each slot group 320 is arranged asymmetrically. The odd number of slots 322 matches the pulsating load of the compressor 4, so that the output torque of the product is more stable. 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 the noise and vibration of the compressor 4 can be improved.

[0173] like Figure 4 , Figure 5 and Figure 6 As shown, a motor 1 according to some other embodiments of the present application includes a stator 10 and a rotor 30 .

[0174] The stator 10 includes a stator core 100 , and the stator core 100 is provided with an assembly cavity 180 .

[0175] The rotor 30 is rotatably disposed in the assembly cavity 180 .

[0176] In this embodiment, the motor 1 includes a stator 10 and a rotor 30 .

[0177] The rotor 30 includes a plurality of permanent magnets 340 and a rotor core 310 .

[0178] The rotor core 310 includes a core body 312 , a shaft hole 314 , a plurality of magnet slot groups 316 , and a plurality of slot groups 320 .

[0179] A plurality of magnet slot groups 316 are arranged around the shaft hole 314 at intervals, and the magnet slot groups 316 are used to install permanent magnets 340 to form magnetic poles.

[0180] A plurality of slit groups 320 are spaced apart around the shaft hole 314 .

[0181] A slot group 320 is arranged between each magnet slot group 316 and the outer peripheral wall of the core body 312 .

[0182] The slit group 320 includes an odd number of slits 322 .

[0183] The rotor core 310 is applied to the motor 1, and the motor 1 is applied to the compressor 4. Since the compressor 4 is a pulsating load, the structure of the rotor core 310 is reasonably set so that the slot group 320 on the rotor core 310 includes an odd number of slots 322, that is, the number of slots 322 included in each slot group 320 is an odd number. The odd number of slots 322 in each slot group 320 is arranged asymmetrically. The odd number of slots 322 matches the pulsating load of the compressor 4, so that the output torque of the product is more stable. 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 the noise and vibration of the compressor 4 can be improved.

[0184] In some embodiments, Figure 4 As shown, on the axial end surface of the rotor core 310 , there is an inter-pole center line 350 between adjacent magnet slot groups 316 in the plurality of magnet slot groups 316 .

[0185] In 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 gmin.

[0186] The minimum gap is located at the magnetic pole center line 330 of the core body 312 .

[0187] The value of the maximum gap between the outer peripheral wall of the rotor 30 and the inner peripheral wall of the stator 10 is represented by gmax.

[0188] The maximum gap is at the extreme centerline.

[0189] Among them, 0.6≤gmin / gmax≤0.8.

[0190] In this embodiment, the structure of the rotor 30 is further defined, wherein, on the axial end surface of the rotor core 310 , there is an inter-pole center line 350 between adjacent magnet slot groups 316 among the plurality of magnet slot groups 316 .

[0191] The value of the minimum gap between the outer circumferential wall of the rotor 30 and the inner circumferential wall of the stator 10 in the radial direction of the rotor 30 is denoted as gmin, and the value of the maximum gap between the outer circumferential wall of the rotor 30 and the inner circumferential wall of the stator 10 in the radial direction of the rotor 30 is denoted as gmax. The relationship between gmin and gmax is defined to satisfy 0.6≤gmin / gmax≤0.8. Limited by the manufacturing process, the value of the minimum gap between the outer circumferential wall of the rotor 30 and the inner circumferential wall of the stator 10 is gmin≥0.4mm. Assuming gmin=0.45mm, the value of gmin / gmax is too small, gmax is large, the equivalent air gap of the motor 1 increases, and the effective output torque deteriorates. The value of gmin / gmax is too large, gmax is small, the air gap magnetic flux density of the motor 1 is too high, and the 2-fold radial force density deteriorates, which is not conducive to the noise improvement of the motor 1. Fig.10As shown, the present application further optimizes the back EMF waveform of the motor 1, improves the torque pulsation of the motor 1 under load conditions, has the effect of improving the operating noise of the motor 1 and the compressor 4, and optimizes the 2-fold frequency radial force density.

[0192] Optionally, gmin / gmax=0.62, gmin / gmax=0.64, gmin / gmax=0.66, gmin / gmax=0.68, gmin / gmax=0.7, gmin / gmax=0.72, gmin / gmax=0.74, gmin / gmax=0.76 and gmin / gmax=0.78, etc., which are not listed here one by one.

[0193] Among them, along the radial direction of the rotor 30, the relationship between the minimum gap gmin between the outer peripheral wall of the rotor 30 and the inner peripheral wall of the stator 10 and the slot width d2 of the stator slot 150 of the second punching sheet group 120 satisfies: 0.08<gmin / d2<0.15. By optimizing and limiting 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.

[0194] If gmin / 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.

[0195] If gmin / 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.

[0196] like Figure 8 As shown, when the relationship between gmin and d2 satisfies 0.08<gmin / d2<0.15, the radial force density of the motor 1 is improved and the output torque of the motor 1 is increased.

[0197] In some embodiments, Figure 4 , Figure 5 and Fig. 9 As shown, the inner diameter of the stator core 100 is denoted as D1.

[0198] The outer diameter of the stator core 100 is denoted as D2.

[0199] Among them, 0.6≤D1 / D2≤0.7.

[0200] In this embodiment, the structure of the stator core 100 is further defined, so that 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 D1 and D2 satisfy 0.6≤D1 / D2≤0.7.

[0201] 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 340 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.

[0202] 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.

[0203] like Otherwise, the area of ​​the stator slot 150 of the stator 10 will be reduced, so that the stator teeth 190 and the 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.

[0204] 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.

[0205] 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.

[0206] In some embodiments, Figure 6 As shown, the stator core 100 includes a first punching sheet group 110 and a second punching sheet group 120 .

[0207] 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 , and the second punching sheet group 120 is closer to the end of the stator core 100 than the first punching sheet group 110 .

[0208] 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 .

[0209] Each tooth portion 140 is connected to the inner peripheral wall of the annular yoke portion 130 , and a plurality of tooth portions 140 are arranged at intervals around the axis of the stator core 100 .

[0210] Any two adjacent tooth portions 140 and the annular yoke portion 130 enclose a stator slot 150 .

[0211] 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.

[0212] In this embodiment, the stator core 100 includes a first punching sheet group 110 and a second punching sheet group 120 .

[0213] 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 .

[0214] 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 any two adjacent tooth portions 140 and the annular yoke 130 enclose a stator slot 150 .

[0215] 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 any two adjacent tooth portions 140 and the annular yoke 130 enclose a stator slot 150 .

[0216] The structures of the first punching sheet group 110 and the second punching sheet group 120 are defined so that the width 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 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 so as to satisfy: 1<d2 / d1<3.

[0217] 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 1. 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 inward, but a smaller slot width will increase leakage flux, 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. Fig.11 As shown, the present application reasonably arranges the structure of the stator 10 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.

[0218] 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, thus, 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.

[0219] 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.

[0220] 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.

[0221] In some embodiments, Figure 4 and Fig.12 As shown, the permanent magnet 340 of the rotor 30 contains X mass % of cerium.

[0222] The stator 10 further includes a winding 200 .

[0223] The stator core 100 includes a plurality of stator teeth 190 . The plurality of stator teeth 190 are arranged at intervals around the axis of the stator core 100 . The plurality of stator teeth 190 enclose an assembly cavity 180 .

[0224] The winding 200 is wound around a plurality of stator teeth 190 .

[0225] The weight of the plurality of permanent magnets 340 is denoted as Mp.

[0226] The weight of the winding 200 is denoted as Mc.

[0227] The back electromotive force value of motor 1 at a rotation speed of 1000 rpm is denoted as Ke.

[0228] The highest permissible operating voltage of the power devices of the controller of the motor 1 is denoted as Ub.

[0229] Among them, (Mp / Mc)×Ub×X%≤Ke.

[0230] In this embodiment, the motor 1 includes a rotor 30 and a stator 10 .

[0231] The rotor 30 includes a rotor core 310 and a plurality of permanent magnets 340 . The rotor core 310 is provided with a plurality of magnet slot groups 316 . A permanent magnet 340 is disposed in each magnet slot group 316 . The permanent magnet 340 contains X% cerium by mass.

[0232] The stator 10 includes a stator core 100 and a winding 200 . The stator core 100 includes a plurality of stator teeth 190 . The winding 200 is wound around the plurality of stator teeth 190 .

[0233] The weight of the plurality of permanent magnets 340 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.

[0234] Among them, using the permanent magnet 340 containing cerium as the magnetic pole can reduce the content of praseodymium and neodymium elements in the permanent magnet 340, so that the production cost of the permanent magnet 340 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.

[0235] By replacing the relatively expensive praseodymium and neodymium elements in the permanent magnet 340 with the abundant and relatively cheap cerium element, the price of the permanent magnet 340 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 340 to a certain extent, thereby reducing the magnetic energy product of the permanent magnet 340, 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 340 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 output capacity 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 340, 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.

[0236] 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 190 of the stator core 100. The magnetic field of the rotor 30 is correlated with the parameters of the permanent magnet 340. Therefore, by optimizing the relationship between the weight Mp of multiple permanent magnets 340 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.

[0237] It is understandable that the permanent magnet 340 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 340 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 340 is too small, the production cost of the rotor 30 is still high.

[0238] 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.

[0239] Therefore, by reasonably setting the mass percentage X% of cerium in each permanent magnet 340, the weight Mp of multiple permanent magnets 340, 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 340 with a higher cerium content, the content of praseodymium and neodymium elements in the permanent magnets 340 can be reduced, achieving a better purpose of reducing costs and increasing efficiency.

[0240] Specifically, the unit of the weight Mp of the permanent magnet 340 is g, the unit of the weight Mc of the winding 200 is g, the unit of the maximum allowable operating voltage Ub of the power device of the controller of the motor 1 is V, and the unit of the back electromotive force value Ke of the motor 1 at a speed of 1000 rpm is V / krpm.

[0241] like Figure 7 As shown, a compressor 4 according to some other embodiments of the present application includes: a motor 1 as in the above embodiment.

[0242] In this embodiment, the compressor 4 includes an electric motor 1 .

[0243] The motor 1 includes a stator 10 and a rotor 30 .

[0244] The rotor 30 includes a rotor core 310 .

[0245] The rotor core 310 includes a core body 312 , a shaft hole 314 , a plurality of magnet slot groups 316 , and a plurality of slot groups 320 .

[0246] A plurality of magnet slot groups 316 are arranged around the shaft hole 314 at intervals, and the magnet slot groups 316 are used to install permanent magnets 340 to form magnetic poles.

[0247] A plurality of slit groups 320 are spaced apart around the shaft hole 314 .

[0248] A slot group 320 is arranged between each magnet slot group 316 and the outer peripheral wall of the core body 312 .

[0249] The slit group 320 includes an odd number of slits 322 .

[0250] The rotor core 310 is applied to the motor 1, and the motor 1 is applied to the compressor 4. Since the compressor 4 is a pulsating load, the structure of the rotor core 310 is reasonably set so that the slot group 320 on the rotor core 310 includes an odd number of slots 322, that is, the number of slots 322 included in each slot group 320 is an odd number. The odd number of slots 322 in each slot group 320 is arranged asymmetrically. The odd number of slots 322 matches the pulsating load of the compressor 4, so that the output torque of the product is more stable. 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 the noise and vibration of the compressor 4 can be improved.

[0251] like Figure 7 As shown, a vehicle according to some further embodiments of the present application includes: a compressor 4 as in the above embodiments.

[0252] In this embodiment, the vehicle comprises a compressor 4 .

[0253] The compressor 4 includes an electric motor 1 .

[0254] The motor 1 includes a stator 10 and a rotor 30 .

[0255] The rotor 30 includes a rotor core 310 .

[0256] The rotor core 310 includes a core body 312 , a shaft hole 314 , a plurality of magnet slot groups 316 , and a plurality of slot groups 320 .

[0257] A plurality of magnet slot groups 316 are arranged around the shaft hole 314 at intervals, and the magnet slot groups 316 are used to install permanent magnets 340 to form magnetic poles.

[0258] A plurality of slit groups 320 are spaced apart around the shaft hole 314 .

[0259] A slot group 320 is arranged between each magnet slot group 316 and the outer peripheral wall of the core body 312 .

[0260] The slit group 320 includes an odd number of slits 322 .

[0261] The rotor core 310 is applied to the motor 1, and the motor 1 is applied to the compressor 4. Since the compressor 4 is a pulsating load, the structure of the rotor core 310 is reasonably set so that the slot group 320 on the rotor core 310 includes an odd number of slots 322, that is, the number of slots 322 included in each slot group 320 is an odd number. The odd number of slots 322 in each slot group 320 is arranged asymmetrically. The odd number of slots 322 matches the pulsating load of the compressor 4, so that the output torque of the product is more stable. 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 the noise and vibration of the compressor 4 can be improved.

[0262] 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.

[0263] Specifically, the motor 1 includes a permanent magnet synchronous motor.

[0264] The motor 1 includes a stator 10 and a rotor 30 , and the rotor 30 is rotatably connected to the stator 10 .

[0265] The rotor 30 includes a rotor core 310. The rotor core 310 is provided with a plurality of magnet slot groups 316, and the plurality of magnet slot groups 316 are arranged at intervals around the shaft hole 314 of the rotor core 310. The rotor core 310 is provided with a plurality of slit groups 320, and a slit group 320 is arranged between each magnet slot group 316 and the outer peripheral wall of the core body 312. The slit group 320 includes an odd number of slits 322. The motor 1 of the present application can give priority to improving the noise and vibration level of the motor 1 while ensuring the power density of the motor 1.

[0266] The odd-numbered slots 322 of the slot group 320 are asymmetrically arranged along the corresponding magnetic pole center lines 330 .

[0267] The core body 312 of the rotor core 310 includes a plurality of magnetic pole center lines 330, the magnetic pole center line 330 has a windward side 332 and a leeward side 334, the number of slits 322 located on the windward side 332 of the magnetic pole center line 330 is an even number, and the number of slits 322 located on the leeward side 334 of the magnetic pole center line 330 is an odd number. 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 and improving 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, the operating efficiency of the motor 1 is improved, and on the other hand, the vibration noise of the motor 1 is improved.

[0268] Each slit group 320 includes a plurality of first slits 322 a and a plurality of second slits 322 b , and the plurality of first slits 322 a are symmetrically arranged with the magnetic pole center line 330 as a symmetry axis.

[0269] The second slit 322 b is located on the windward side 332 of the magnetic pole center line 330 .

[0270] The first slit 322 a located on the windward side 332 is disposed close to the magnetic pole center line 330 , and the second slit 322 b is located on a side of the first slit 322 a away from the magnetic pole center line 330 .

[0271] The second slit 322 b is closer to the magnetic pole center line 330 than the first slit 322 a .

[0272] The inner diameter of the stator core 100 of the stator 10 is denoted as D1, and the outer diameter of the stator core 100 is denoted 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 340 can be increased, and the armature reaction voltage can be improved. Under the condition of the same back electromotive force, the number of turns of the winding 200 of the stator 10 is reduced, the anti-demagnetization ability of the motor 1 is improved, and the reliability of the motor 1 is further ensured.

[0273] 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.

[0274] The rotor 30 includes a permanent magnet 340, the mass percentage of cerium in the permanent magnet 340 satisfies: 2%<X%<8%, and the permanent magnet 340 does not contain the heavy rare earth element terbium. This configuration can improve the power density of the motor 1 without using heavy rare earth terbium, ensuring that the performance of the motor 1 meets product requirements.

[0275] like Figure 7 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.

[0276] The motor 1 is used to rotate the driving shaft 43. The motor 1 includes a stator 10 and a rotor 30.

[0277] The compression unit 46 is driven by the drive shaft 43 to compress the refrigerant.

[0278] The frequency converter 42 is used to control the permanent magnet synchronous motor.

[0279] 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 .

[0280] The motor 1 can ensure both the power density and the reliability of the motor 1 without using heavy rare earth terbium.

[0281] 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.

[0282] Since the compressor 4 is a pulsating load, the odd number of slits 322 of the slit group 320 are asymmetrically arranged along the corresponding magnetic pole center line 330 , which can effectively improve the radial force density of the 16f motor 1 and improve the noise and vibration of the compressor 4 .

[0283] The straight line where the magnetic pole center line 330 is located matches with the two slit groups 320, and the two slit groups 320 are respectively recorded as the first slit group and the second slit group. The axis of the rotor core 310 is located between the first slit group and the second slit group. After the first slit group rotates 180° along the rotation direction of the rotor 30, the slits 322 of the first slit group and the slits 322 of the second slit group overlap. This setting ensures that the center of mass of the rotor 30 will not deviate from the rotation axis during the rotation process, so as to maintain the dynamic balance of the motor 1 and prevent the phenomenon of local wear from being aggravated.

[0284] Taking the 12-slot 8-pole motor 1 as an example, the odd number of slits 322 of the slit group 320 are asymmetrically arranged along the magnetic pole center line 330, 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.

[0285] Each slit group 320 includes three slits 322. The motor 1 with this arrangement has a simple structure and can reduce the production cost of the die.

[0286] Optionally, d1 and d2 satisfy: 1.5<d2 / d1<3. 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, 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.

[0287] Optionally, the number of first punching sheet groups 110 is recorded as m, the number of second punching sheet groups 120 is recorded as n, and a first punching sheet group 110 is arranged between any two adjacent second punching sheet groups 120, wherein m≥1, n≥2. That is, the axial end surface of each first punching sheet group 110 is provided with a second punching sheet group 120.

[0288] 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.

[0289] 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.

[0290] Optionally, 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. That is to say, 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, that is, the magnetic leakage can be reduced while ensuring the performance of the motor 1.

[0291] Optionally, the stator core 100 further includes: a third punching sheet group 160, the second punching sheet group 120 is located between the first punching sheet group 110 and the third punching sheet group 160; the third punching sheet group 160 includes an annular yoke 130 and a plurality of tooth portions 140, and 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 recorded as d3, wherein d3>d2>d1.

[0292] 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 .

[0293] 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 .

[0294] 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.

[0295] 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.

[0296] 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 .

[0297] Optionally, 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.

[0298] 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.

[0299] 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 .

[0300] 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.

[0301] Optionally, the wall surface of the tooth portion 140 facing the axis of the stator core 100 is the tooth surface; the tooth surface of at least one of the first punching sheet group 110, the second punching sheet group 120 and the third punching sheet group 160 includes an arc segment and a connecting segment, and the connecting segment is connected to one side of the arc segment in the circumferential direction of the stator core 100, and the arc segment is closer to the axis of the stator core 100 than the connecting segment. The tooth surface of the first punching sheet group 110 includes an arc segment and a connecting segment, or the tooth surface of the second punching sheet group 120 includes an arc segment and a connecting segment, or the tooth surface of the third punching sheet group 160 includes an arc segment and a connecting segment, or the tooth surface of the first punching sheet group 110 and the tooth surface of the second punching sheet group 120 both include an arc segment and a connecting segment, or the tooth surface of the first punching sheet group 110 and the tooth surface of the third punching sheet group 160 both include an arc segment and a connecting segment, or the tooth surface of the second punching sheet group 120 and the tooth surface of the third punching sheet group 160 both include an arc segment and a connecting segment, or any one of the tooth surfaces of the first punching sheet group 110, the second punching sheet group 120 and the third punching sheet group 160 includes an arc segment and a connecting segment.

[0302] 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 100. The circular arc section is closer to the axis of the stator core 100 than the connecting section, that is, the distance from the circular arc section to the circumference of the stator core 100 is smaller than the distance from the connecting section to the axis of the stator core 100.

[0303] 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.

[0304] 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. 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.

[0305] This arrangement can meet the use requirement that the distance from the connecting segment to the axis of the stator core 100 is greater than the distance from the arc segment to the axis of the stator core 100 , and can improve the armature reaction.

[0306] Optionally, the mass percentage of cerium in the permanent magnet 340 satisfies: 2%<X%<8%. This setting takes into account both the performance of the motor 1 and the production cost of the motor 1.

[0307] That is, the addition of the relatively cheap and abundant cerium element to the permanent magnet 340 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 340 can be reduced while ensuring the performance of the motor 1, thereby improving the cost performance of the motor 1.

[0308] If the mass percentage of cerium in the permanent magnet 340 is greater than or equal to 8%, the coercive force of the permanent magnet 340 decreases, which will reduce the magnetic energy product of the permanent magnet 340 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.

[0309] If the mass percentage of cerium in the permanent magnet 340 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.

[0310] Optionally, 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 recorded as δ, wherein 0.08<δ / d2<0.15. By optimizing and limiting 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.

[0311] 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.

[0312] 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.

[0313] Optionally, the stator core 100 includes a stator yoke 10 and a plurality of stator teeth 190, each stator tooth 190 is connected to the inner peripheral wall of the stator yoke 10, and the plurality of stator teeth 190 are arranged at intervals around the axis of the stator core 100, and any two adjacent stator teeth 190 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, provided at the first end; and a second insulating frame, provided at the second end, and either the first insulating frame and the second insulating frame includes a plurality of insulating teeth, each of which is provided at least in part. Each stator tooth 190 is connected to an insulating tooth, and 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 notch 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 notch width of the stator slot 150 is recorded as T, wherein d01<T. 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. Each stator tooth 190 includes a tooth portion 140 of the first punching sheet group 110 and a tooth portion 140 of the second punching sheet group 120.

[0314] 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 190 is connected to one insulating tooth of the first insulating frame and one insulating tooth of the second insulating frame.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] 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.

[0319] Optionally, the extension part is connected to the slot wall of the stator slot 150. That is, the extension part is located at the slot opening of the stator slot 150, and the extension part is connected to the slot wall of the stator slot 150. This arrangement enables the extension part and the slot wall of the stator slot 150 to be connected as a whole. In this way, it is possible to effectively prevent the slot insulation paper from protruding from the gap between the slot wall of the stator slot 150 and the extension part, providing effective and reliable structural support to ensure the safety and reliability of the use of the motor 1.

[0320] Optionally, the insulating tooth with an extension portion includes a tooth body, the tooth body is provided with a slot, and the end of the stator tooth 190 is inserted into the slot; the extension portion is connected to the end face of the tooth body facing the axis of the stator core 100, and the extension portion includes two extension sections, the two extension sections are arranged at intervals in the circumferential direction of the stator core 100, each extension section extends into the notch of a stator slot 150, and each extension section abuts against the slot insulation paper. The structure of the first insulating frame and the second insulating frame is further defined, so that the insulating tooth with an extension portion includes a tooth body, the tooth body is provided with a slot, and the end of the stator tooth 190 is inserted into the slot. This arrangement is conducive to increasing the matching area of ​​the first insulating frame, the second insulating frame and the stator core 100, and can ensure the stability and reliability of the assembly of the first insulating frame, the second insulating frame and the stator core 100.

[0321] Among them, the extension portion includes two extension sections, and the two extension sections are arranged at intervals along the circumference of the stator core 100, and any one of the two extension sections is connected to the end face of the tooth body facing the axis of the stator core 100. And each extension section extends into the notch of a stator slot 150, that is, the two extension sections of the extension portion extend into the notches of two stator slots 150 respectively. In other words, two extension sections are provided at the notch of a stator slot 150, or four extension sections are provided at the notch of a stator slot 150. This arrangement can increase the abutment area between the extension portion and the slot insulation paper, and ensure the balance and consistency of the abutment between the extension portion and the slot insulation paper, and avoid the situation that the slot insulation paper is easily convex due to the abutment of one side of the circumference of the slot insulation paper against the extension portion, and the separation of the other side of the circumference of the slot insulation paper from the extension portion.

[0322] In addition, the extension part is connected to the end face of the tooth body facing the axis of the stator core 100. This arrangement can not only meet the use requirement of the extension part being located at the slot opening of the stator slot 150, but also reduce the occupancy rate of the extension part on the internal space of the stator slot 150.

[0323] Optionally, when the insulating teeth of either the first insulating frame or 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 circumferential direction 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.

[0324] 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.

[0325] Optionally, d1 and d2 satisfy: 1.5<d2 / d1<3. That is, 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.

[0326] If d2 / d1 is less than or equal to 1.5, 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.

[0327] 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.

[0328] In some embodiments, optionally, the stator core 100 also includes: a third punching sheet group 160, the second punching sheet group 120 is located between the first punching sheet group 110 and the third punching sheet group 160; the third punching sheet group 160 includes an annular yoke 130 and a plurality of tooth portions 140, and along the circumferential direction of the stator core 100, the gap value between two adjacent tooth surfaces of the third punching sheet group 160 is recorded as d3, wherein d3>d2.

[0329] 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.

[0330] The third punching sheet group 160 includes an annular yoke 130 and a plurality of teeth 140, any of the plurality of teeth 140 is connected to the inner peripheral wall of the annular yoke 130, and the plurality of teeth 140 are arranged at intervals around the axis of the stator core 100. The stator 10 yoke includes an annular yoke 130, and each stator tooth 190 includes one tooth 140.

[0331] 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.

[0332] 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.

[0333] 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 .

[0334] Optionally, the number of first punching sheet groups 110 is denoted as m, the number of second punching sheet groups 120 is denoted as n, a first punching sheet group 110 is arranged between any two adjacent second punching sheet groups 120, m≥1, n≥2; the axial height of the first punching sheet group 110 is denoted as h1, the axial height of the second punching sheet group 120 is denoted as h2, wherein 0.05<(m×h1) / (n×h2)<0.2.

[0335] The structure of the first punching sheet group 110 and the second punching sheet group 120 is defined such 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.

[0336] 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.

[0337] 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.

[0338] And the relationship between h1, h2, m and n is defined to satisfy: 0.05<(m×h1) / (n×h2)<0.2. That is to say, 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 while ensuring the performance of the motor 1.

[0339] 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.

[0340] 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.

[0341] Optionally, the mass percentage of cerium in the permanent magnet 340 satisfies: 2%<X%<8%. This setting takes into account both the performance of the motor 1 and the production cost of the motor 1.

[0342] That is, the addition of the relatively cheap and abundant cerium element to the permanent magnet 340 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 340 can be reduced while ensuring the performance of the motor 1, thereby improving the cost performance of the motor 1.

[0343] If the mass percentage of cerium in the permanent magnet 340 is greater than or equal to 8%, the coercive force of the permanent magnet 340 decreases, which will reduce the magnetic energy product of the permanent magnet 340 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.

[0344] If the mass percentage of cerium in the permanent magnet 340 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.

[0345] Specifically, the mass percentage of cerium in the permanent magnet 340 includes 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, etc., which are not listed here one by one.

[0346] Optionally, the maximum allowable operating voltage Ub=650 V, or the maximum allowable operating voltage Ub=1200 V. The value of the maximum allowable operating voltage of the power device of the controller of the motor 1 is further limited.

[0347] Optionally, the maximum allowable operating voltage Ub=650V, or the maximum allowable operating voltage Ub=1200V.

[0348] The power devices of the controller of the motor 1 include, but are not limited to, SiC (silicon carbide) power devices, IGBT (Insulated Gate Bipolar Transisitor) and GaN (gallium nitride) power devices.

[0349] The maximum allowable operating voltage of the power device of the controller is equal to 650V, or the maximum allowable operating voltage of the power device of the controller is equal to 1200V. At this time, the efficiency of the controller of motor 1 is relatively high. When the maximum allowable operating voltage of the power device is 650V, it can be used in occasions where the rated output DC voltage of the battery pack is 500V and below. When the maximum allowable operating voltage of the power device is 1200V, it can be used in occasions where the rated output DC voltage of the battery pack is 800V and below. The voltage resistance levels of power devices with a maximum allowable operating voltage of 650V and power devices with a maximum allowable operating voltage of 1200V can cover the current common application scenarios of new energy electric vehicles, and can give full play to the efficiency advantages of motor 1.

[0350] Optionally, the residual magnetic flux density Br of the permanent magnet 340 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 340 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 340 at 20°C is lower than 1.2T, the motor 1 cannot provide sufficient output capacity.

[0351] Optionally, the intrinsic coercive force Hcj of the permanent magnet 340 at 20°C satisfies: 21.3kOe≤Hcj≤25.2kOe. The structure of the permanent magnet 340 is further limited so that the intrinsic coercive force of the permanent magnet 340 at 20°C is recorded as Hcj, Hcj is greater than or equal to 21.3kOe, and Hcj is less than or equal to 25.2kOe. The intrinsic coercive force of the permanent magnet 340 is a key indicator for measuring the anti-demagnetization ability of the permanent magnet 340. If Hcj is less than 21.3kOe, the anti-demagnetization ability of the permanent magnet 340 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 earths will increase, and the cost will increase sharply, which is not conducive to improving the cost performance of the motor 1.

[0352] 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.

[0353] 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 rotor core, characterized in that: include: Core body; An axial hole is provided in the core body; A plurality of magnet slot groups are provided on the core body, and the plurality of magnet slot groups are arranged at intervals around the shaft hole; A plurality of slit groups are provided on the core body, one slit group is arranged between each magnet slot group and the outer peripheral wall of the core body, and the slit group includes an odd number of slits.

2. The rotor core according to claim 1, characterized in that: The core body includes a plurality of magnetic pole center lines, each of the slot groups is located at one of the magnetic pole center lines, a portion of the slots in the slot group are located on the windward side of the magnetic pole center line, and another portion of the slots in the slot group are located on the leeward side of the magnetic pole center line.

3. The rotor core according to claim 2, characterized in that: The number of the slits located on the windward side is greater than the number of the slits located on the leeward side.

4. The rotor core according to claim 3, characterized in that: The number of the slits located on the windward side is an even number, and the number of the slits located on the leeward side is an odd number.

5. The rotor core according to any one of claims 2 to 4, characterized in that: Each of the slit groups includes a plurality of first slits and a second slit. The plurality of first slits are symmetrically arranged with the magnetic pole center line as a symmetry axis, and the second slit is located on one side of the plurality of first slits.

6. The rotor core according to claim 5, characterized in that: The second slit is located on the windward side of the magnetic pole centerline.

7. The rotor core according to claim 6, characterized in that: The first slit located on the windward side is arranged close to the magnetic pole center line, and the second slit is located on a side of the first slit away from the magnetic pole center line.

8. The rotor core according to claim 6, characterized in that: The second slit is closer to the magnetic pole center line than the first slit.

9. The rotor core according to claim 5, characterized in that: The shape of the first slit located on the windward side is different from the shape of the first slit located on the leeward side; or The shape of the first slit located on the windward side is the same as the shape of the first slit located on the leeward side.

10. A rotor, characterized in that: include: a plurality of permanent magnets; and According to any one of claims 1 to 9, a permanent magnet is disposed in each of the magnet slot groups.

11. A motor, characterized in that: include: A stator, the stator comprising a stator core, the stator core being provided with an assembly cavity; and The rotor according to claim 10, wherein the rotor is rotatably disposed in the assembly cavity.

12. The motor according to claim 11, characterized in that On the axial end surface of the rotor core, there is an inter-pole center line between adjacent magnet slot groups in the plurality of magnet slot groups; In the radial direction of the rotor, the value of the minimum gap between the outer peripheral wall of the rotor and the inner peripheral wall of the stator is recorded as gmin, and the minimum gap is located at the magnetic pole center line of the core body. The value of the maximum gap between the outer peripheral wall of the rotor and the inner peripheral wall of the stator is recorded as gmax, and the maximum gap is located at the inter-pole center line; Among them, 0.6≤gmin / gmax≤0.

8.

13. The electric machine according to claim 11 or 12, characterized in that: The inner diameter of the stator core is denoted as D1, and the outer diameter of the stator core is denoted as D2, wherein 0.6≤D1 / D2≤0.

7.

14. The motor according to claim 11 or 12, characterized in that: The stator core comprises: 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 any 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.

15. The electric machine according to claim 11 or 12, characterized in that: The permanent magnet of the rotor contains X% cerium by mass; The stator further includes a winding, the stator core includes a plurality of stator teeth, the plurality of stator teeth are arranged at intervals around the axis of the stator core, the plurality of stator teeth enclose the assembly cavity, and 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.

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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