Motor, compressor and refrigeration equipment

Abstract

The utility model discloses a motor, compressor and refrigeration equipment, the motor comprises a rotor assembly and a stator assembly, the stator assembly comprises a stator iron core, the rotor assembly comprises magnetic steel, a rotor iron core and iron core baffle plates located at two ends of the rotor iron core, and the rotor iron core is rotatably arranged in the stator assembly; the iron core baffle plate is made of a magnetic conductive material; the rotor core is provided with a plurality of magnetic steel grooves, one side of the groove wall of each magnetic steel groove in the rotation direction is provided with fixed elastic sheets and avoiding grooves at intervals, the magnetic steel is arranged in the magnetic steel grooves, and the fixed elastic sheets deform along the insertion direction of the magnetic steel and are arranged in the avoiding grooves; the length of the rotor core is L1, the length of the stator core is L2, and L2 / L1 is larger than or equal to 1 / 3 and smaller than or equal to 1 / 2. Compared with a motor with the same specification, the technical scheme of the utility model can reduce the axial length of the motor and improve the compactness, efficiency and performance of the motor, thereby meeting the ever-increasing requirements for miniaturized and efficient motors.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a motor, a compressor and a refrigeration device. Background Art

[0002] In traditional motor design, the limitation of axial length leads to an increase in the overall size of the motor, which may affect the installation and integration of the motor. Reducing the axial length of the motor can improve the compactness, efficiency and performance of the motor, thereby meeting the growing demand for miniaturized and efficient motors. Utility Model Content

[0003] The main purpose of the utility model is to provide a motor, aiming to reduce the axial length of motors of the same specification, thereby reducing the weight and inertia of the motor and improving the dynamic response and operating efficiency of the motor.

[0004] To achieve the above-mentioned purpose, the motor proposed by the utility model includes:

[0005] a stator assembly, including a stator core; and

[0006] A rotor assembly, comprising a magnetic steel, a rotor core and core baffles located at both ends of the rotor core, wherein the rotor core is rotatably arranged in the stator assembly; the core baffle is configured as a magnetic conductive material; a fixing groove is provided on the core baffle and the rotor core, and a fixing member is inserted into the fixing groove to fix the core baffle and the rotor core;

[0007] The rotor core is provided with a plurality of magnetic steel slots, and the slot walls of the plurality of magnetic steel slots are provided with fixed spring sheets and avoidance slots at intervals on one side of the rotation direction. The magnetic steel is placed in the magnetic steel slots, and the fixed spring sheets are deformed along the magnetic steel insertion direction and placed in the avoidance slots; the length of the rotor core is L1, and the length of the stator core is L2, 1 / 3≤L2 / L1≤1 / 2.

[0008] The technical solution of the utility model firstly optimizes the motor structure and improves the power density and performance of the motor by making the length of the rotor core greater than the length of the stator core; secondly, the magnetic steel is fixed by fixing the spring sheet, and the fixing spring sheet is placed in the avoidance groove after deformation, so that the overall structure is more compact. In traditional motors, the lengths of the stator and rotor cores are usually equal, and a certain gap needs to be left between the two to ensure that the rotor can rotate, but by designing the rotor core to be longer than the stator core, the overall size of the motor can be reduced without sacrificing the performance of the motor, thereby improving the compactness and efficiency of the motor and effectively reducing the axial length of the motor; in addition, by configuring the core baffle as a magnetic conductive material, the use of magnetic conductive material can effectively guide the flow of the magnetic field while ensuring the fixing effect of the rotor core, thereby enhancing the conduction performance of the magnetic field and reducing the leakage of the magnetic field, and improving the rotation efficiency and stability of the rotor core; by using magnetic conductive material on the end plate of the rotor core, the magnetic field can be more effectively utilized, so that it can act more concentratedly on the working parts of the motor, thereby reducing the space required for the motor in the axial direction, thereby reducing the axial length of the motor.

[0009] Optionally, the length of the rotor core is L1, the length of the stator core is L2, L1=L2+L; 10mm≤L≤18mm.

[0010] Optionally, the stator assembly further comprises a stator coil, a first winding frame and a second winding frame; the stator core comprises a first stator segment, a stator main body segment and a second stator segment which are stacked in sequence;

[0011] The first winding bobbin, the first stator segment, the stator main body segment, the second stator segment and the second winding bobbin are stacked in sequence along the axial direction, and the stator coil is respectively arranged in the first winding bobbin and the second winding bobbin; and the area of ​​the stator slots of the first stator segment and the second stator segment is different from the area of ​​the stator slots of the stator main body segment.

[0012] Optionally, the areas of the stator slots of the first stator segment and the second stator segment are S1, the area of ​​the stator slots of the stator main body segment is S2, S1=S2*N, 1.1≤N≤1.2.

[0013] Optionally, the length of the stator main body segment is L3, the lengths of the first stator segment and the second stator segment are both L4, L2=L3+2*L4, 2mm≤L4≤2.5mm.

[0014] Optionally, the rotor core comprises a first core segment and a second core segment axially stacked, the inner diameter of the first core segment is larger than the inner diameter of the second core segment; the inner diameter of the axial hole of the first core segment is D a , the inner diameter of the axial hole of the second core segment is Db , D a -D b >7mm, and D a <R1, R1 is the radius of the rotor assembly.

[0015] Optionally, the thickness of the core baffle is L6, the length of the first core segment is L7, the length of the second core segment is L8, the length of the rotor assembly is L1, L1=L7+L8+2*L6, where 0.3mm≤L6≤1mm, the length of the first core segment is L7, the length of the second core segment is L8, satisfying the relationship: 1≤L7 / L8≤5.

[0016] Optionally, the first core segment includes alternately stacked first core sheets and second core sheets, the second core segment includes alternately stacked third core sheets and fourth core sheets, the outermost side of the upper end of the rotor core is the first core sheet, and the outer side of the lower end of the rotor core is the fourth core sheet;

[0017] The number of magnetic isolation bridges of the first core punching sheet and the fourth core punching sheet close to the axial hole of the rotor core is W1, the number of poles of the rotor is P, and W1=P;

[0018] The number of magnetic isolation bridges between the second core punching sheet and the third core punching sheet close to the axial hole of the rotor core is W2, and W2=P / 2.

[0019] Optionally, the relative magnetic permeability of the core baffle is greater than 1000.

[0020] Optionally, the rotor core comprises a plurality of core punchings stacked in the axial direction, the number of fixed springs on each core punching is M1, the number of avoidance grooves is M2, M2=2*M1, and M1=2*N, where N is an integer of 1 or 2;

[0021] Optionally, two adjacent fixed spring sheets of the rotor core are spaced apart by P / 2-1 magnetic steel slots, where P is the number of rotor poles.

[0022] Optionally, the stator core includes a plurality of tooth tops which are enclosed together to define an axial hole, the tooth tops include a first tooth segment and a second tooth segment, the plurality of first tooth segments share a first circle center, and the rotation axis of the rotor core passes through the first circle center; the plurality of second tooth segments share a second circle center, and the second circle center is offset from the first circle center;

[0023] The distance from the first circle center to the edge of the first tooth segment is R3; with the first circle center as the origin, a rectangular coordinate system is established, and the second circle center is obtained by moving a distance D1 along the X axis and a distance D2 along the Y axis. The distance from the second circle center to the edge of the second tooth segment is R2; the straight-line distance between the second circle center and the first circle center is D3, satisfying the relationship: D3 2 =D1 2 +D2 2 , among which, 0.8mm≤D1≤1.2mm, 2.2mm≤D2≤2.8mm.

[0024] Optionally, the air gap between the rotor assembly and the stator assembly is g, satisfying the relationship: R3=R2+4*g, wherein 0.4mm≤g≤0.8mm.

[0025] Optionally, the radius of the rotor assembly is R1, the stator core includes a plurality of silicon steel sheets, the thickness of the silicon steel sheets is T, satisfying the relationship: R1+R2+D2+g=2*R3+D1+T; wherein 0.4mm≤g≤0.8mm, 0.8mm≤D1≤1.2mm, 2.2mm≤D2≤2.8mm, 0.35mm≤T≤0.5mm.

[0026] The utility model also provides a compressor, comprising the motor as described above.

[0027] The utility model also provides a refrigeration device, comprising the compressor as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 An exploded view of an embodiment of a motor of the utility model;

[0030] Figure 2 for Figure 1 Exploded view of the motor;

[0031] Figure 3 for Figure 2 A schematic structural diagram of an embodiment of a rotor core and a stator core;

[0032] Figure 4 for Figure 3 A schematic structural diagram of an embodiment of a punching sheet of a stator main body section;

[0033] Figure 5 for Figure 3 A schematic structural diagram of an embodiment of a first stator segment and a second stator segment;

[0034] Figure 6 for Figure 2 A schematic structural diagram of an embodiment of a middle rotor assembly.

[0035] Description of Figure Numbers:

[0036] Label name Label name 100 Motor 300 Stator components 200 Rotor assembly 310 Stator core 210 Core baffle 320 Shaft hole 220 Rotor core 330 Tooth top 221 External open magnetic bridge 340 First tooth segment 222 Fully connected magnetic bridge 341 First center 223 notch 350 Second tooth segment 224 Magnetic steel slot 351 Second center 225 Avoidance slot 360 Silicon steel sheet 226 Fixed spring 311 first stator section 230 The first core section 312 Stator main section 231 The first core punching 313 Second stator segment 232 Second core punching 314 Stator slot 240 The second core segment 315 Stator coil 241 The third core punching 316 The first winding frame 242 Fourth core punching 317 Second winding frame

[0037] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0041] In traditional motor design, the limitation of axial length leads to an increase in the overall size of the motor, which may affect the installation and integration of the motor. Reducing the axial length of the motor can improve the compactness, efficiency and performance of the motor, thereby meeting the growing demand for miniaturized and efficient motors.

[0042] Reference Figure 1In one embodiment of the utility model, the motor 100 includes a rotor assembly 200 and a stator assembly 300. The rotor assembly 200 includes a rotor core 220 and core baffles 210 located at both ends of the rotor core 220. The stator assembly 300 includes a stator core 310. The stator core 310 is provided with an axial hole 320 matched with the rotor assembly 200. The length of the rotor core 220 is greater than the length of the stator core 310. The core baffle 210 is configured as a magnetic conductive material. The length of the rotor core 220 is greater than the length of the stator core 310. The length of the rotor core 220 is L1, and the length of the stator core 310 is L2, and 1 / 3≤L2 / L1≤1 / 2.

[0043] Specifically, the core baffle 210 and the rotor core 220 are both provided with fixing grooves, and the fixing members are passed through the fixing grooves to fix the core baffle and the rotor core. The existing end plate locking and fixing rotor core solution may be referred to.

[0044] A plurality of magnetic steel slots 224 are provided on the rotor core 220, and the slot walls of the plurality of magnetic steel slots 224 are provided with fixed spring plates 226 and avoidance slots 225 at intervals on one side of the rotation direction. The magnets (not marked in the figure) are placed in the magnetic steel slots 224, and the fixed spring plates 226 are deformed along the insertion direction of the magnets and placed in the avoidance slots 225; this can ensure the clearance fit between the magnets and the magnetic steel slots 224, provide sufficient fixing strength for the magnets, and achieve simple assembly.

[0045] In one embodiment, the fixing spring piece 226 is a single spring piece structure.

[0046] In one embodiment, the fixing spring piece 226 is a double spring piece structure, a double tongue type (snake tongue type).

[0047] The technical solution of the utility model first optimizes the structure of the motor 100 by limiting the length of the rotor core 220 to be greater than the length of the stator core 310, thereby improving the power density and performance of the motor 100; secondly, the magnetic steel is fixed by fixing the spring sheet, and the fixing spring sheet is placed in the avoidance groove after deformation, so that the overall structure is more compact. In traditional motors, the lengths of the stator and rotor cores are usually equal, and a certain gap needs to be left between the two to ensure that the rotor can rotate. However, by designing the rotor core 220 to be longer than the stator core 310, the overall size of the motor 100 can be reduced without sacrificing the performance of the motor 100. size, thereby improving the compactness and efficiency of the motor 100 and effectively reducing the axial length of the motor 100; in addition, by configuring the core baffle 210 as a magnetic conductive material, the magnetic conductive material can effectively guide the flow of the magnetic field, thereby enhancing the conduction performance of the magnetic field and reducing the leakage of the magnetic field, and the rotation efficiency and stability of the rotor core 220 can be improved; by using magnetic conductive material on the end plate of the rotor core 220, the magnetic field can be more effectively utilized, so that it can act more concentratedly on the working parts of the motor, thereby reducing the space required for the motor 100 in the axial direction, and then reducing the axial length of the motor 100.

[0048] Reference Figure 2 and Figure 3 Specifically, the outer contour of the stator core 310 is a square shape. Compared with a complex circular shape, a square shape is easier to process and manufacture, which can reduce manufacturing costs and improve production efficiency; and the square stator core 310 has better strength and rigidity when bearing mechanical loads, which is conducive to improving the mechanical stability and durability of the motor 100.

[0049] In order to enable the motor 100 to operate more efficiently and reliably in practical applications, the number of slots of the stator assembly 300 of the motor 100 of the present application is 12 slots, and the number of poles of the rotor assembly 200 satisfies 12±k*2, where k is an integer of 1, for example, the motor 100 has 12 slots and 8 poles; 12 slots and 10 poles, etc.

[0050] Designing the number of slots of the stator assembly 300 and the number of poles of the rotor assembly 200 according to the rule of 12±k*2 is conducive to reducing harmonics, reducing noise, improving the characteristics of the motor 100 and increasing stability. Specifically, because the combination of a 12-slot stator and a 12±2k-pole rotor can reduce the unevenness of the magnetic field, thereby reducing the generation of harmonics and improving the working efficiency and stability of the motor 100. It helps to reduce the noise level of the motor 100 during operation and improve the working environment and comfort of the motor 100; in addition, this design can enable the motor 100 to have better performance under rated conditions, such as improving the power factor and reducing the core loss.

[0051] Furthermore, by setting the relationship between the lengths of the rotor core 220 and the stator core 310 , it is beneficial to optimize the magnetic circuit distribution, reduce magnetic resistance loss, reduce core loss, improve the efficiency of the motor 100, and improve stability and reliability.

[0052] Reference Figure 1 Specifically, the length of the rotor core 220 is L1, and the length of the stator core 310 is L2, L1 = L2 + L; 10mm ≤ L ≤ 18mm. The lengths of the rotor core 220 and the stator core 310 satisfy the relationship of L1 = L2 + L, which helps to optimize the magnetic circuit distribution of the motor 100, make the magnetic field more evenly distributed in the core, reduce magnetic resistance, and improve the conduction efficiency of the magnetic circuit. By reasonably designing the length relationship between the rotor core 220 and the stator core 310, the magnetic resistance loss can be reduced, the energy loss can be reduced, and the efficiency and performance of the motor 100 can be improved. Reasonable design of the core length relationship can also improve the stability and reliability of the motor 100, while ensuring performance and reducing the failure rate. It can be understood that a large rotor mass helps to improve the stability of the motor 100 and reduce fluctuations caused by external disturbances; a large rotor mass can increase the inertia of the motor 100, making the motor 100 more stable during startup, acceleration and deceleration, reducing vibration and noise, and improving work efficiency.

[0053] Optionally, in order to improve the slot filling rate and reduce the overall height at the same time, the stator core 310 includes a first stator segment 311, a stator main segment 312, and a second stator segment 313 which are stacked in sequence, the length of the stator main segment 312 is L3, the length of the first stator segment 311 and the second stator segment 313 are both L4, L2=L3+2*L4, 2mm≤L4≤2.5mm. The length ratio of the stator main segment 312 and the first and second stator segments 313 is adjusted to make the structure of the stator core 310 more compact, increase the number of layers of the stator winding, and accommodate more wires in a limited space, thereby improving the filling degree of the winding and thus improving the slot filling rate. The segmented design can increase the effective cross-sectional area of ​​the core, help improve the magnetic conductivity of the magnetic circuit, and thus improve the efficiency and performance of the motor 100. It is convenient to accurately design the size and shape of the slot according to the actual situation, so that it is more suitable for placing the winding, reducing the gap, and improving the filling degree of the winding in the slot, and finally improving the slot filling rate.

[0054] Reference Figure 1 and Figure 2Optionally, in order to facilitate manufacturing and assembly, and to make the overall structure compact and improve stability, the stator assembly 300 further includes a stator coil 315, a first winding frame 316, a second winding frame 317, a first stator end plate and a second stator end plate; the first winding frame 316, the first stator end plate, the stator core 310, the second stator end plate, and the second winding frame 317 are stacked in sequence along the axial direction, and the stator coil 315 is respectively arranged in the first winding frame 316 and the second winding frame 317. Stacking the stator coil 315, the first winding frame 316, the second winding frame 317, the first stator end plate and the second stator end plate in the stator assembly 300 in sequence along the axial direction has the following advantages:

[0055] Stacking the components in the axial direction can make the entire stator structure more compact, effectively utilize space, reduce the volume and weight of the motor 100, and improve the power density and performance of the motor 100. Stacking the components can enhance the overall stability of the stator, reduce looseness or displacement between components, and improve the stability and reliability of the motor 100 during operation. Stacking the components in the axial direction can simplify the manufacturing process, facilitate assembly and maintenance, improve production efficiency and reduce manufacturing costs.

[0056] Reference Figure 4 and Figure 5 Further, in order to increase the area of ​​the stator slots 314 of the first stator segment 311 and the second stator segment 313 to S1, the area of ​​the stator slots 314 of the stator body segment 312 to S2, S1 = S2*N, 1.1≤N≤1.2.

[0057] By limiting the ratio of S1 to S2, the stability and uniformity of the stator core 310 structure can be maintained in the design, thereby improving the overall performance and reliability of the motor 100, and the first winding skeleton 316 and the second winding skeleton 317 can be closely combined with the core to achieve a more compact structural design, thereby improving the overall sealing and stability of the motor 100. The sunken design can also effectively protect the insulating material from the influence of the external environment, extend the service life of the insulating material, and thus improve the reliability of the motor 100.

[0058] The rotor assembly 200 is now described.

[0059] Reference Figure 1 Specifically, for ease of assembly, the rotor core 220 includes a first core segment 230 and a second core segment 240 that are axially stacked, the inner diameter of the axial hole 320 of the first core segment 230 is Da, the inner diameter of the axial hole 320 of the second core segment 240 is Db, Da-Db>7mm, and Da<R1, R1 is the radius of the rotor assembly 200.

[0060] The inner diameter of the first core segment 230 is larger than the inner diameter of the second core segment 240, which can play a role of avoidance, and can effectively reduce the length of the magnetic circuit, thereby reducing the hysteresis loss when the magnetic flux changes. The design of core segments with different inner diameters can reduce the volume of the entire core while ensuring performance, making the motor 100 more compact and lightweight.

[0061] Specifically, the first core segment 230 includes alternately stacked first core sheets 231 and second core sheets 232, the second core segment 240 includes alternately stacked third core sheets 241 and fourth core sheets 242, the outermost side of the upper end of the rotor core 220 is the first core sheet 231, and the outer side of the lower end of the rotor core 220 is the fourth core sheet 242;

[0062] The number of magnetic isolation bridges of the first core punching sheet 231 and the fourth core punching sheet 242 close to the shaft hole 320 is W1, and the number of poles of the rotor is P, W1=P;

[0063] The number of magnetic isolation bridges between the second core punching sheet 232 and the third core punching sheet 241 close to the shaft hole 320 is W2, where W2=P / 2.

[0064] The second core punching sheet 232 and the third core punching sheet 241 are partially internal open magnetic bridges. The internal open magnetic bridge refers to a certain gap or opening in the middle of the magnetic circuit, so that the magnetic field can flow in this gap or opening. Compared with the fully enclosed internal magnetic bridge, the setting of the internal open magnetic bridge can provide a more flexible magnetic field adjustment method. By controlling the size or shape of the gap, the distribution and intensity of the magnetic field can be effectively adjusted. The effective length of the magnetic circuit can be reduced, thereby reducing the magnetic resistance, improving the conduction efficiency of the magnetic circuit, and reducing energy loss. It is conducive to heat dissipation, making it easier to dissipate the heat in the magnetic circuit, which helps to improve the stability and reliability of the equipment. It can simplify the structural design, reduce the number of parts, reduce manufacturing costs, and improve production efficiency.

[0065] In addition, compared with the solution of fully open inner magnetic bridge, the design of partially open inner magnetic bridge enables better connection and support between magnetic steel slots 224, which can reduce vibration and noise during rotor operation and improve the running stability and comfort of motor 100. The design of magnetic slot group can effectively reduce deformation and damage of magnetic steel slots 224 and improve the reliability and service life of the rotor.

[0066] Specifically, the rotor assembly 200 further includes two core baffles 210 respectively disposed at both ends of the rotor core 220, the thickness of the core baffle 210 is L6, the length of the first core segment 230 is L7, the length of the second core segment 240 is L8, and the length of the rotor assembly 200 is L1, L1=L7+L8+2*L6, wherein 0.3mm≤L6≤1mm. The core baffle 210 is used to increase the moment of inertia of the rotor.

[0067] In one embodiment, the first core segment 230 and the second core segment 240 are outer open magnetic bridges 221 .

[0068] In one embodiment, in order to improve the fixing stability, the axial portion of the first core segment 230 or the second core segment 240 is a fully connected magnetic bridge 222, for example, two core punching sheets are a fully connected magnetic bridge 222, which does not affect the connectivity of the magnetic circuit and can improve the fixing effect.

[0069] It can be understood that the design of the external open magnetic bridge 221 can reduce magnetic leakage, effectively concentrate magnetic flux, avoid energy loss, and improve the power density and efficiency of the motor 100. The design of the full-connected magnetic bridge 222 can enhance the stability of the rotor assembly 200, reduce vibration and noise, and extend the service life of the motor 100.

[0070] In one embodiment, the first core segment 230 and the second core segment 240 are externally open magnetic bridges 221.

[0071] Specifically, the first core punching sheet 231, the second core punching sheet 232, the third core punching sheet 241, and the fourth core punching sheet 242 are rotated by a preset angle in sequence and fixed by riveting. The preset angle is 360° / P, where P is the number of poles of the rotor. Taking the number of ten magnetic steel slots 224 as an example, the rotation angle of adjacent core punching sheets when stacked is 36°.

[0072] In order to optimize the magnetic circuit structure of the motor 100, improve efficiency and reduce energy consumption, the length of the first core segment 230 is L7, and the length of the second core segment 240 is L8, satisfying the relationship: 1≤L7 / L8≤5; by reasonably setting the length ratio of the first core segment 230 and the second core segment 240, the distribution of the magnetic field inside the motor 100 can be optimized, making the magnetic field more uniform, thereby improving the efficiency and performance of the motor 100. By adjusting the length ratio of the first core segment 230 and the second core segment 240, the magnetic resistance of the entire rotor core 220 can be reduced, energy loss can be reduced, and the power density and operating efficiency of the motor 100 can be improved. In addition, meeting a certain length ratio range is conducive to controlling the loss of the core, avoiding excessive eddy current loss and hysteresis loss of the core during operation, and extending the service life of the motor 100.

[0073] Combination Figure 6In order to further improve the overall performance of the motor 100, the thickness of the first core sheet 231 is La, the thickness of the fourth core sheet 242 is Lb, and 0.35≤La=Lb≤L6≤1. Reasonable design of the thickness range of the first core sheet 231 and the fourth core sheet 242 helps to enhance the stability of the motor 100, reduce vibration and noise, and improve the reliability and running stability of the motor 100. By controlling the thickness range of the core sheet, eddy current loss can be reduced, the energy efficiency performance of the motor 100 can be improved, the operating temperature can be reduced, and the service life of the motor 100 can be extended.

[0074] Specifically, the core baffle 210 is a magnetic material, and the relative magnetic permeability is greater than 1000; selecting a magnetic material with a relative magnetic permeability greater than 1000 as the core baffle 210 can effectively enhance the magnetic permeability of the magnetic circuit of the motor 100, improve the conduction efficiency of the magnetic flux, thereby reducing magnetic resistance, reducing energy loss, and improving the efficiency of the motor 100. Magnetic materials with high relative magnetic permeability help to concentrate and guide the magnetic field, so that the magnetic field is more concentrated and evenly distributed in the required area, which is conducive to improving the performance of the motor 100. Using magnetic materials with high relative magnetic permeability as the core baffle 210 can reduce magnetic leakage, avoid the loss of magnetic field energy, improve the magnetic energy utilization rate of the motor 100, and further improve the efficiency of the motor 100. Magnetic materials with high relative magnetic permeability help to stabilize the working state of the motor 100, reduce the fluctuation and instability of the magnetic field, and improve the reliability and stability of the motor 100.

[0075] In order to improve the efficiency, performance and stability of the motor 100, the width of the slot 223 of the core baffle 210 is smaller than the width of the slot 223 of the magnetic steel slot 224 of the rotor core 220. The narrow slot 223 of the core baffle 210 can reduce the leakage of the magnetic field, improve the efficiency of the rotor core 220, and reduce energy loss. The narrow slot 223 design can reduce the magnetic force between the cores and reduce the noise and vibration of the motor 100 during operation.

[0076] The inner diameter of the stator of existing motor products is mostly an overall circular structure. During the operation of the motor, especially at high speed, the torque pulsation is large, and a large radial force is generated when the winding is excited and energized, causing the motor stator to vibrate under the excitation of the radial electromagnetic force, thereby causing the entire motor to vibrate and make noise.

[0077] In the related art, in order to reduce the electromagnetic vibration and noise of the motor, the radial thickness of the stator-rotor air gap is simply increased, which leads to a reduction in the torque output of the motor.

[0078] Conventional methods to reduce electromagnetic excitation include adjusting the pole arc coefficient, changing the slot width, opening auxiliary slots, optimizing the rotor pole arc shape and the permanent magnet cutting angle, etc. Among them, changing the slot width and opening auxiliary slots can effectively weaken the harmonic magnetic field of a specific order, but at the same time, it will also cause the deterioration of other harmonic magnetic fields.

[0079] To this end, the utility model proposes that the stator core of the motor adopts a design in which two sections of the tooth top share different centers, which has a significant inhibitory effect on the radial electromagnetic force generated by the harmonic magnetic field of the motor, thereby improving the air gap magnetic density, weakening the various high-order harmonic magnetic fields of the rotor, thereby reducing radial force and vibration, and suppressing electromagnetic noise excitation.

[0080] Reference Figures 2 to 5 The shaft hole 320 is defined by the edges of multiple tooth tops 330 of the stator core 310. The tooth tops 330 include a first tooth segment 340 and a second tooth segment 350. The rotation axis of the rotor core 220 is defined as the center of the shaft hole 320. Multiple first tooth segments 340 share a first center 341, and the first center 341 coincides with the center of the shaft hole 320; multiple second tooth segments 350 share a second center 351, and the second center 351 is offset from the first center 341.

[0081] The technical solution of the utility model can increase the magnetic flux of the motor 100 by making the length of the rotor core 220 longer than the length of the stator core 310, and can achieve greater output power in the same volume, thereby improving the power density of the motor 100. By increasing the length of the rotor core 220, the magnetic circuit design of the motor 100 can be improved, the magnetic resistance can be reduced, and the uniformity of the magnetic field can be improved. The longer rotor core 220 can reduce the magnetic resistance between the rotor core 220 and the stator core 310, reduce the core loss, thereby improving the overall efficiency of the motor 100, and helping to improve the dynamic response characteristics of the motor 100, so that the motor 100 performs more stably and reliably under operating conditions such as starting, acceleration and deceleration. By adopting the shaft hole 320, compared with the stator inner diameter of the existing overall circular structure, the shape of the stator core is adjusted to the inner diameter of the non-circular structure, so that the magnetic field is more uniform at the stator inner diameter, reducing the influence of the radial force; the shaft hole 320 has a stator-rotor air gap with a larger radial thickness, which is beneficial to reducing the radial electromagnetic force density, thereby reducing the electromagnetic vibration and noise of the motor 100 and weakening the tooth slot torque; and the stator-rotor air gap with a smaller radial thickness is beneficial to increase the output torque of the motor 100 and reduce the vibration and noise during the operation of the motor 100.

[0082] Reference Figure 4In order to reduce the generation of air gap magnetic field harmonics, the rotation axis of the rotor core 220 is defined as the center of the shaft hole 320, and the distance from the first center 341 to the edge of the first tooth segment 340 is R3; with the first center 341 as the origin, a rectangular coordinate system is established, and the second center 351 is obtained by moving a distance D1 along the X-axis and a distance D2 along the Y-axis, and the distance from the second center 351 to the edge of the second tooth segment 350 is R2; the straight-line distance between the second center 351 and the first center 341 is D3, satisfying the relationship: D32=D12+D22, wherein 0.8mm≤D1≤1.2mm, 2.2mm≤D2≤2.8mm.

[0083] The air gaps between the first tooth segment 340 and the second tooth segment 350 of the stator core 310 and the rotor core 220 are different, thereby forming an asymmetric magnetic circuit, optimizing the magnetic circuit design, making the magnetic flux distribution more uniform, and improving the efficiency and output performance of the motor 100.

[0084] For reference, the coordination of the stator core 310 with a non-circular inner diameter and the rotor core 220 can optimize the radial force. The eccentric design can cause the rotor to produce a radial eccentric distance when rotating, thereby generating a more uniform radial force under the action of the magnetic field, thereby reducing the vibration caused by the unbalanced magnetic force.

[0085] By optimizing the eccentric design of the shaft hole 320, the fluctuation of the magnetic field in the radial direction can be reduced. In addition, the asymmetric magnetic circuit design formed between the stator and the rotor can make the magnetic resistance of the magnetic flux in different parts more evenly distributed, reduce the unevenness of the magnetic resistance, reduce the local saturation phenomenon at the tooth tip, and thus reduce the generation of air gap magnetic field harmonics. The asymmetric magnetic circuit design can effectively reduce the concentration of the magnetic field at the tooth tip, make the magnetic field more evenly distributed in the entire magnetic circuit, reduce the crowding and accumulation of the magnetic flux at the tooth tip, and reduce the magnetic flux density of the stator core 310, thereby reducing the stator iron loss and reducing the generation of magnetic field fluctuations and harmonics.

[0086] Specifically, in order to further reduce core loss, improve stability and reliability, and improve the output performance of the motor 100, thereby improving the overall performance level of the motor 100, the air gap between the rotor assembly 200 and the stator assembly 300 is g, satisfying the relationship: R3=R2+4*g, where 0.4mm≤g≤0.8mm.

[0087] By limiting the size of the air gap, a suitable gap between the rotor core 220 and the stator core 310 is ensured, which is conducive to optimizing the magnetic circuit design of the motor 100. The uniformity of the magnetic field can be improved, and leakage magnetic flux can be reduced, thereby improving the efficiency and performance of the motor 100. Appropriate control of the air gap size can reduce core loss, improve the energy efficiency ratio of the motor 100, and extend the service life of the motor 100. Maintaining an appropriate air gap size helps to reduce the asymmetry between the rotor core 220 and the stator core 310, improve the operating stability of the motor 100, reduce noise and vibration, and enhance the reliability of the motor 100.

[0088] In order to ensure the reasonableness of the air gap (g) between the rotor assembly 200 and the stator assembly 300 and the sizes and positions of the various components, the radius of the rotor assembly 200 is R1, and the stator core 310 includes a plurality of silicon steel sheets 360, and the thickness of the silicon steel sheets 360 is T, satisfying the relationship: R1+R2+D2+g=2*R3+D1+T; wherein 0.4mm≤g≤0.8mm, 0.8mm≤D1≤1.2mm, 2.2mm≤D2≤2.8mm, and 0.35mm≤T≤0.5mm.

[0089] Through such a limited relationship, the positional relationship between the rotor assembly 200 and the stator assembly 300 can be effectively controlled to ensure that they can be accurately matched during the assembly process, thereby improving the assembly accuracy. Reasonable control of the air gap between the rotor and the stator and the size relationship of each component can help reduce the adverse effects of magnetic resistance, iron loss, etc. on the performance of the motor 100, thereby optimizing the performance of the motor 100 and improving efficiency and stability. By ensuring the reasonable gap and positional relationship between the components, the wear and noise caused by friction and collision during operation can be reduced, the service life of the motor 100 can be extended, and the work efficiency can be improved. Reasonable design of the air gap between the rotor and the stator can reduce magnetic field leakage, reduce iron loss, thereby reducing the energy consumption of the motor 100 and improving energy utilization efficiency. Limiting the relationship that satisfies R1+R2+D2+g=2*R3+D1+T helps to ensure the reasonable matching between the components in the design of the motor 100, thereby improving the performance, reliability and work efficiency of the motor 100.

[0090] In order to ensure the performance of the motor 100, the magnet needs to be fixed to the magnet slot 224. The mainstream fixing methods are: integral rotor injection molding / potting; applying adhesive between the magnet and the magnet slot 224; adding end plates at both ends of the rotor axial direction; adding expansion material in the magnet slot 224; in the above methods, the rotor punchings and magnets need to be cured with glue, plastic, end plates and other materials, and additional processes are required during production, resulting in low production efficiency and high production costs. At the same time, in the long-term environment of refrigerant and lubricant, glue, plastic, etc., are prone to compatibility problems, affecting product performance, and even causing failure of the fixation of the permanent magnet and the rotor core 220, resulting in failure.

[0091] In this solution, the rotor core 220 is provided with a plurality of magnetic steel slots 224, and the plurality of magnetic steel slots 224 are provided with fixed spring plates 226 and avoidance slots 225 at intervals on one side of the rotation direction. When the magnetic steel is placed in the magnetic steel slot 224, the fixed spring plates 226 are deformed along the magnetic steel insertion direction and are placed in the avoidance slots 225, which can ensure the clearance fit between the magnetic steel and the magnetic steel slot 224, provide sufficient fixing strength for the magnetic steel, and realize simple assembly.

[0092] In one embodiment, the fixing spring piece 226 is a single spring piece structure.

[0093] In one embodiment, the fixing spring piece 226 is a double spring piece structure, a double tongue type (snake tongue type).

[0094] Specifically, the rotor core 220 includes a plurality of core punching sheets, the number of the fixing spring sheets 226 on each core punching sheet is M1, the number of the avoidance grooves 225 is M2, M2=2*M1, and M1=2*N, where N is an integer of 1 or 2.

[0095] For example, two fixed spring sheets 226 are provided on a core punching sheet. According to the above-mentioned corresponding limiting relationship, the number of the avoidance grooves 225 is four, and the four avoidance grooves 225 and the two fixed spring sheets 226 are arranged according to the following relationship, so that two adjacent fixed spring sheets 226 of the rotor core 220 are spaced apart by P / 2-1 magnetic steel slots 224, where P is the number of rotor poles.

[0096] In this way, the fixing effect of the fixing spring piece 226 on the magnetic steel is guaranteed after the magnetic steel is inserted into the magnetic steel groove 224, and the fixing spring piece 226 is prevented from interfering with the core punching sheet during the axial deformation process, ensuring that the fixing spring piece 226 can be located in the avoidance groove 225 after deformation.

[0097] The utility model also proposes a compressor, which includes a motor 100. The specific structure of the motor 100 refers to the above embodiment. Since the compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0098] The utility model further provides a refrigeration device. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0099] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the concept of the utility model, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A motor, characterized in that: include: a stator assembly, including a stator core; and A rotor assembly, comprising a magnetic steel, a rotor core and core baffles located at both ends of the rotor core, wherein the rotor core is rotatably arranged in the stator assembly; the core baffle is configured as a magnetic conductive material; a fixing groove is provided on the core baffle and the rotor core, and a fixing member is inserted into the fixing groove to fix the core baffle and the rotor core; The rotor core is provided with a plurality of magnetic steel slots, and the slot walls of the plurality of magnetic steel slots are provided with fixed spring sheets and avoidance slots at intervals on one side of the rotation direction. The magnetic steel is placed in the magnetic steel slots, and the fixed spring sheets are deformed along the magnetic steel insertion direction and placed in the avoidance slots; the length of the rotor core is L1, and the length of the stator core is L2, 1 / 3≤L2 / L1≤1 / 2.

2. The motor according to claim 1, characterized in that The length of the rotor core is L1, the length of the stator core is L2, L1=L2+L; 10mm≤L≤18mm.

3. The motor according to claim 2, characterized in that The stator assembly further comprises a stator coil, a first winding frame and a second winding frame; the stator core comprises a first stator segment, a stator main segment and a second stator segment which are stacked in sequence; The first winding bobbin, the first stator segment, the stator main body segment, the second stator segment and the second winding bobbin are stacked in sequence along the axial direction, and the stator coil is respectively arranged in the first winding bobbin and the second winding bobbin; and the area of ​​the stator slots of the first stator segment and the second stator segment is different from the area of ​​the stator slots of the stator main body segment.

4. The motor according to claim 3, characterized in that The areas of the stator slots of the first stator segment and the second stator segment are S1, the area of ​​the stator slots of the stator main body segment is S2, S1=S2*N, 1.1≤N≤1.

2.

5. The motor according to claim 3, characterized in that The length of the stator main body segment is L3, the lengths of the first stator segment and the second stator segment are both L4, L2=L3+2*L4, 2mm≤L4≤2.5mm.

6. The motor according to claim 1, characterized in that The rotor core comprises a first core segment and a second core segment axially stacked, wherein the inner diameter of the first core segment is greater than the inner diameter of the second core segment; the inner diameter of the axial hole of the first core segment is D a , the inner diameter of the axial hole of the second core segment is D b , D a -D b >7mm, and D a <R1, R1 is the radius of the rotor assembly.

7. The motor according to claim 6, characterized in that The thickness of the core baffle is L6, the length of the first core segment is L7, the length of the second core segment is L8, the length of the rotor assembly is L1, L1=L7+L8+2*L6, where 0.3mm≤L6≤1mm, the length of the first core segment is L7, the length of the second core segment is L8, and the relationship is satisfied: 1≤L7 / L8≤5.

8. The motor according to claim 6, characterized in that The first core segment includes alternately stacked first core sheets and second core sheets, the second core segment includes alternately stacked third core sheets and fourth core sheets, the outermost side of the upper end of the rotor core is the first core sheet, and the outer side of the lower end of the rotor core is the fourth core sheet; The number of magnetic isolation bridges of the first core punching sheet and the fourth core punching sheet close to the axial hole of the rotor core is W1, the number of poles of the rotor is P, and W1=P; The number of magnetic isolation bridges between the second core punching sheet and the third core punching sheet close to the axial hole of the rotor core is W2, and W2=P / 2.

9. The motor according to claim 1, characterized in that The relative magnetic permeability of the core baffle is greater than 1000.

10. The motor according to claim 1, characterized in that The rotor core comprises a plurality of core punching sheets stacked in the axial direction, the number of fixed spring sheets on each core punching sheet is M1, the number of avoidance grooves is M2, M2=2*M1, and M1=2*N, where N is an integer of 1 or 2; And / or, two adjacent fixed spring sheets of the rotor core are spaced apart by P / 2-1 magnetic steel slots, where P is the number of rotor poles.

11. The motor according to claim 1, characterized in that The stator core includes a plurality of tooth tops which are enclosed together to define an axial hole, the tooth tops include a first tooth segment and a second tooth segment, the plurality of first tooth segments share a first circle center, and the rotation axis of the rotor core passes through the first circle center; the plurality of second tooth segments share a second circle center, and the second circle center is offset from the first circle center; The distance from the first circle center to the edge of the first tooth segment is R3; with the first circle center as the origin, a rectangular coordinate system is established, and the second circle center is obtained by moving a distance D1 along the X axis and a distance D2 along the Y axis. The distance from the second circle center to the edge of the second tooth segment is R2; the straight-line distance between the second circle center and the first circle center is D3, satisfying the relationship: D3 2 =D1 2 +D2 2 , among which, 0.8mm≤D1≤1.2mm, 2.2mm≤D2≤2.8mm.

12. The motor according to claim 11, characterized in that The air gap between the rotor assembly and the stator assembly is g, satisfying the relationship: R3=R2+4*g, where 0.4mm≤g≤0.8mm.

13. The motor according to claim 12, characterized in that The radius of the rotor assembly is R1, the stator core includes a plurality of silicon steel sheets, the thickness of the silicon steel sheets is T, and the relationship is satisfied: R1+R2+D2+g=2*R3+D1+T; wherein 0.4mm≤g≤0.8mm, 0.8mm≤D1≤1.2mm, 2.2mm≤D2≤2.8mm, 0.35mm≤T≤0.5mm.

14. A compressor, characterized in that: Comprising the electric machine as claimed in any one of claims 1 to 13.

15. A refrigeration device, characterized in that: Comprising the compressor of claim 14.

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