Motor, compressor and refrigeration equipment

Abstract

The invention discloses a motor, a 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 baffles located at the 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 motors of the same specification, the axial length of the motor can be reduced, the compactness, efficiency and performance of the motor are improved, and therefore the increasing requirements for miniaturization and high efficiency of the motor are met.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a motor, compressor, and refrigeration equipment. Background Technology

[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. Summary of the Invention

[0003] The main objective of this invention is to provide a motor that reduces the axial length of motors of the same specifications, thereby reducing the weight and inertia of the motor and improving its dynamic response and operating efficiency.

[0004] To achieve the above objectives, the present invention provides a motor comprising:

[0005] Stator assembly, including stator core; and

[0006] The rotor assembly includes a magnet, a rotor core, and core baffles located at both ends of the rotor core. The rotor core is rotatably disposed within the stator assembly. The core baffles are made of a magnetically conductive material. Both the core baffles and the rotor core are provided with fixing slots, and fixing members are inserted into the fixing slots to fix the core baffles and the rotor core.

[0007] The rotor core is provided with multiple magnet slots. The slot walls of the multiple magnet slots are provided with fixing springs and clearance slots at intervals on one side of the rotation direction. The magnets are placed in the magnet slots, and the fixing springs are deformed along the insertion direction of the magnets and placed in the clearance slots. The length of the rotor core is L1, and the length of the stator core is L2, where 1 / 3 ≤ L2 / L1 ≤ 1 / 2.

[0008] The technical solution of this invention firstly optimizes the motor structure by making the rotor core longer than the stator core, thereby improving the motor's power density and performance. Secondly, by fixing the magnets with fixing springs, which deform and are placed in clearance slots, the overall structure becomes more compact. In traditional motors, the stator and rotor cores are usually of equal length, and a certain gap needs to be left between them to ensure the rotor can rotate. However, by designing the rotor core to be longer than the stator core, the overall size of the motor can be reduced without sacrificing motor performance, thus improving the motor's compactness and efficiency, and effectively reducing the motor's axial length. In addition, by configuring the core baffles with magnetically conductive material, the magnetically conductive material can effectively guide the magnetic field flow while ensuring the fixing effect of the rotor core, thereby enhancing the magnetic field conduction performance and reducing magnetic field leakage, which can improve the rotational efficiency and stability of the rotor core. By using magnetically conductive material on the end plates of the rotor core, the magnetic field can be utilized more effectively, making it act more concentrated on the working parts of the motor, thereby reducing the space required in the axial direction of the motor, and thus reducing the axial length of the motor.

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

[0010] Optionally, the stator assembly further includes a stator coil, a first winding frame, and a second winding frame; the stator core includes a first stator segment, a stator body segment, and a second stator segment stacked sequentially.

[0011] The first winding frame, the first stator segment, the stator body segment, the second stator segment, and the second winding frame are stacked sequentially along the axial direction, and the stator coils are respectively disposed in the first winding frame and the second winding frame; 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 body segment.

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

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

[0014] Optionally, the rotor core includes a first core segment and a second core segment stacked axially, wherein the inner diameter of the first core segment is larger than the inner diameter of the second core segment; and the inner diameter of the shaft hole of the first core segment is D. a The inner diameter of the shaft hole of the second iron core section is D.b D a -D b >7mm, and D a <R1, where 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, and the length of the rotor assembly is L1, where L1 = L7 + L8 + 2 * L6, and 0.3mm ≤ L6 ≤ 1mm. The lengths of the first core segment and the second core segment satisfy the relationship: 1 ≤ L7 / L8 ≤ 5.

[0016] Optionally, the first core segment includes alternating stacked first core laminations and second core laminations, the second core segment includes alternating stacked third core laminations and fourth core laminations, the outermost part of the upper end of the rotor core is the first core lamination, and the outermost part of the lower end of the rotor core is the fourth core lamination.

[0017] The number of magnetic bridges between the first core lamination and the fourth core lamination near the shaft hole of the rotor core is W1, and the number of poles of the rotor is P, W1 = P;

[0018] The number of magnetic bridges in the shaft holes of the second and third core laminations near the rotor core is W2, where W2 = P / 2.

[0019] Optionally, the relative permeability of the core baffle is >1000.

[0020] Optionally, the rotor core includes a plurality of core laminations stacked along the axial direction, each core lamination having a fixed spring plate of M1 and a clearance groove of M2, M2 = 2 * M1 and M1 = 2 * N, where N is an integer of 1 or 2.

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

[0022] Optionally, the stator core includes a plurality of tooth tips that together enclose and define a shaft hole. Each tooth tip includes a first tooth segment and a second tooth segment. The plurality of first tooth segments share a first center, and the rotation axis of the rotor core passes through the first center. The plurality of second tooth segments share a second center, and the second center is offset from the first center.

[0023] The distance from the center of the first circle to the edge of the first tooth segment is R3; establishing a rectangular coordinate system with the first circle as the origin, moving a distance D1 along the X-axis and a distance D2 along the Y-axis to obtain the second circle center, 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 Where 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, where 0.4mm≤g≤0.8mm.

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

[0026] The present invention also proposes a compressor comprising the motor described above.

[0027] The present invention also proposes a refrigeration device, including the compressor described above. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is an exploded view of an embodiment of the motor of the present invention;

[0030] Figure 2 for Figure 1 Exploded view of the China Electric Machinery Plant;

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

[0032] Figure 4 for Figure 3 A schematic diagram of the structure of a lamination in the main body section of the middle stator;

[0033] Figure 5 for Figure 3 A schematic diagram of the structure of one embodiment of the first stator segment and the second stator segment;

[0034] Figure 6 for Figure 2 A schematic diagram of the structure of one embodiment of the rotor assembly.

[0035] Explanation of icon numbers:

[0036] label name label name 100 motor 300 stator assembly 200 Rotor assembly 310 stator core 210 Iron core baffle 320 Shaft Hole 220 Rotor core 330 Tooth tip 221 External open magnetic bridge 340 First tooth segment 222 All-connected magnetic bridge 341 First center 223 notch 350 Second tooth segment 224 Magnetic steel trough 351 Second center 225 clearance slot 360 silicon steel sheets 226 Fixed spring 311 first stator section 230 First iron core section 312 Stator main body section 231 First iron core lamination 313 Second stator segment 232 Second core lamination 314 stator slot 240 Second core section 315 Stator coils 241 Third core lamination 316 First winding frame 242 Fourth core lamination 317 Second winding frame

[0037] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

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

[0040] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[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 present invention, 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, which has shaft holes 320 that mate with the rotor assembly 200. The length of the rotor core 220 is greater than the length of the stator core 310. The core baffles 210 are made of a magnetically 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, where 1 / 3 ≤ L2 / L1 ≤ 1 / 2.

[0043] Specifically, both the core baffle 210 and the rotor core 220 are provided with fixing grooves, and the fixing members are inserted into the fixing grooves to fix the core baffle and the rotor core; the existing end plate locking fixing rotor core scheme can be referred to.

[0044] The rotor core 220 is provided with multiple magnet slots 224. The slot walls of the multiple magnet slots 224 are provided with fixing springs 226 and clearance slots 225 at intervals on one side of the rotation direction. The magnets (not shown in the figure) are placed in the magnet slots 224. The fixing springs 226 are deformed along the magnet insertion direction and placed in the clearance slots 225. This can ensure the clearance fit between the magnets and the magnet slots 224, provide sufficient fixing strength for the magnets, and achieve simple assembly.

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

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

[0047] The technical solution of this invention 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, by fixing the magnets with fixing springs, and placing the deformed fixing springs within clearance slots, the overall structure becomes more compact. In traditional motors, the stator and rotor cores are usually of equal length, and a certain gap needs to be left between them to ensure 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 its performance. The compactness and efficiency of the motor 100 are improved by reducing the size of the core baffle 210, thereby effectively reducing the axial length of the motor 100. In addition, by configuring the core baffle 210 as a magnetic material, the magnetic material can effectively guide the flow of the magnetic field, thereby enhancing the magnetic field conduction performance and reducing magnetic field leakage, which can improve the rotational efficiency and stability of the rotor core 220. By using a magnetic material on the end plate of the rotor core 220, the magnetic field can be utilized more effectively and made to act more concentrated on the working parts of the motor, thereby reducing the space required by the motor 100 in the axial direction, and thus 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 square. Compared with the complex circular shape, the square shape is easier to process and manufacture, which can reduce manufacturing costs and improve production efficiency; moreover, the square stator core 310 has better strength and rigidity when bearing mechanical loads, which is beneficial 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 stator assembly 300 of the motor 100 of this application has 12 slots and the rotor assembly 200 has 12 ± k * 2 poles, where k is an integer of 1. For example, the motor 100 has 12 slots and 8 poles; or 12 slots and 10 poles, etc.

[0050] Designing the number of slots in the stator assembly 300 and the number of poles in the rotor assembly 200 according to a pattern of 12±k*2 helps reduce harmonics, lower noise, improve the characteristics of the motor 100, and increase stability. Specifically, the combination of a 12-slot stator and a 12±2k-pole rotor reduces magnetic field inhomogeneity, thereby reducing harmonic generation and improving the efficiency and stability of the motor 100. This also helps reduce the noise level of the motor 100 during operation, improving the working environment and comfort. Furthermore, this design enables the motor 100 to exhibit better performance under rated operating conditions, such as improving the power factor and reducing core losses.

[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 reluctance loss, reduce core loss, improve motor efficiency, and enhance 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, where L1 = L2 + L; 10mm ≤ L ≤ 18mm. The relationship between the lengths of the rotor core 220 and the stator core 310, L1 = L2 + L, helps optimize the magnetic circuit distribution of the motor 100, making the magnetic field more evenly distributed in the core, reducing magnetic reluctance, and improving the transmission efficiency of the magnetic circuit. By rationally designing the length relationship between the rotor core 220 and the stator core 310, magnetic reluctance loss can be reduced, energy loss can be decreased, and the efficiency and performance of the motor 100 can be improved. A rational design of the core length relationship can also improve the stability and reliability of the motor 100, reducing the failure rate while ensuring performance. Understandably, a larger rotor mass helps improve the stability of the motor 100, reducing fluctuations caused by external disturbances; a larger 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 working efficiency.

[0053] Optionally, to improve slot fill factor while reducing overall height, the stator core 310 includes a first stator segment 311, a stator body segment 312, and a second stator segment 313 stacked sequentially. The length of the stator body segment 312 is L3, and the lengths of the first stator segment 311 and the second stator segment 313 are both L4, where L2 = L3 + 2 * L4, and 2mm ≤ L4 ≤ 2.5mm. Adjusting the length ratio of the stator body segment 312 and the first and second stator segments 313 makes the structure of the stator core 310 more compact, increases the number of layers of stator windings, and allows for more wires to be accommodated in a limited space, improving the winding fill factor and thus increasing the slot fill factor. The segmented design increases the effective cross-sectional area of ​​the core, which helps improve the magnetic conductivity of the magnetic circuit, thereby improving the efficiency and performance of the motor 100. It also allows for precise design of the slot size and shape based on actual conditions, making it more suitable for placing the windings, reducing gaps, improving the filling factor of the windings in the slots, and ultimately increasing the slot fill factor.

[0054] Reference Figure 1 and Figure 2Optionally, to facilitate manufacturing and assembly, and to achieve a compact overall structure and improved 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 sequentially along the axial direction, with the stator coil 315 respectively disposed within 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 sequentially along the axial direction in the stator assembly 300 has the following advantages:

[0055] Stacking components along the axial direction makes the entire stator structure more compact, effectively utilizing space, reducing the size and weight of the motor 100, and improving the power density and performance of the motor 100. Stacking components enhances the overall stability of the stator, reduces loosening or displacement between components, and improves the stability and reliability of the motor 100 during operation. Stacking components along the axial direction simplifies the manufacturing process, facilitates assembly and maintenance, improves production efficiency, and reduces manufacturing costs.

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

[0057] By limiting the ratio of S1 and 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. This allows the first winding bobbin 316 and the second winding bobbin 317 to be tightly integrated with the core, achieving a more compact structural design and improving the overall sealing and stability of the motor 100. The recessed design also effectively protects the insulation material from the influence of the external environment, extending the service life of the insulation material and further improving the reliability of the motor 100.

[0058] The rotor assembly 200 is described below.

[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 stacked axially. The inner diameter of the shaft hole 320 of the first core segment 230 is Da, and the inner diameter of the shaft hole 320 of the second core segment 240 is Db. Da-Db>7mm and Da<R1, where R1 is the radius of the rotor assembly 200.

[0060] The fact that the inner diameter of the first core segment 230 is larger than that of the second core segment 240 can serve as a buffer, effectively reducing the length of the magnetic circuit and thus reducing hysteresis losses when the magnetic flux changes. By using core segments with different inner diameters, the overall core volume can be reduced while maintaining performance, making the motor 100 more compact and lightweight.

[0061] Specifically, the first core segment 230 includes alternating stacked first core laminations 231 and second core laminations 232, the second core segment 240 includes alternating stacked third core laminations 241 and fourth core laminations 242, the outermost part of the upper end of the rotor core 220 is the first core lamination 231, and the outermost part of the lower end of the rotor core 220 is the fourth core lamination 242.

[0062] The number of magnetic bridges near the shaft hole 320 in the first core lamination 231 and the fourth core lamination 242 is W1, and the number of poles of the rotor is P, W1 = P;

[0063] The number of magnetic bridges near the shaft hole 320 in the second core lamination 232 and the third core lamination 241 is W2, where W2 = P / 2.

[0064] The second core lamination 232 and the third core lamination 241 are partially open magnetic bridges. An open magnetic bridge refers to a magnetic circuit with a certain gap or opening in the middle, allowing the magnetic field to flow within this gap or opening. Compared to a fully enclosed internal magnetic bridge, the open magnetic bridge design provides a more flexible way to adjust the magnetic field. By controlling the size or shape of the gap, the distribution and intensity of the magnetic field can be effectively adjusted. It can reduce the effective length of the magnetic circuit, thereby reducing magnetic reluctance, improving the conduction efficiency of the magnetic circuit, and reducing energy loss. It is beneficial for heat dissipation, making it easier for heat in the magnetic circuit to dissipate, which helps improve the stability and reliability of the equipment. It can simplify the structural design, reduce the number of parts, lower manufacturing costs, and improve production efficiency.

[0065] Furthermore, compared to the fully open internal magnetic bridge design, the partially open internal magnetic bridge design provides better connection and support between the magnet slots 224, reducing vibration and noise during rotor operation and improving the smoothness and comfort of motor 100 operation. The design of the magnetic slot assembly can effectively reduce deformation and damage to the magnet slots 224, improving the reliability and service life of the rotor.

[0066] Specifically, the rotor assembly 200 also includes two core baffles 210 respectively disposed at both ends of the rotor core 220. The thickness of the core baffles 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, where L1 = L7 + L8 + 2 * L6, and 0.3mm ≤ L6 ≤ 1mm. The core baffles 210 are used to increase the rotor's moment of inertia.

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

[0068] In one embodiment, in order to improve the fixation 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, the two core laminations are fully connected magnetic bridges 222. This does not affect the connection of the magnetic circuit and can improve the fixation effect.

[0069] Understandably, the design of the externally 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. Meanwhile, the design of the fully 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 lamination 231, the second core lamination 232, the third core lamination 241, and the fourth core lamination 242 are rotated sequentially by a preset angle and then fixed by rivets. The preset angle is 360° / P, where P is the number of poles of the rotor. Taking a ten-magnet slot 224 as an example, the rotation angle when adjacent core laminations are stacked is 36°.

[0072] 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 rationally setting the length ratio of the first core segment 230 and the second core segment 240, the distribution of the internal magnetic field of 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 reluctance 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 beneficial to controlling core losses, avoiding excessive eddy current losses and hysteresis losses during operation, and extending the service life of the motor 100.

[0073] Combination Figure 6To further improve the overall performance of the motor 100, the thickness of the first core lamination 231 is La, and the thickness of the fourth core lamination 242 is Lb, where 0.35 ≤ La = Lb ≤ L6 ≤ 1. A reasonable design of the thickness range of the first core lamination 231 and the fourth core lamination 242 helps to enhance the stability of the motor 100, reduce vibration and noise, and improve the reliability and smoothness of operation. By controlling the thickness range of the core laminations, eddy current losses can be reduced, the energy efficiency of the motor 100 can be improved, the operating temperature can be lowered, and the service life of the motor 100 can be extended.

[0074] Specifically, the core baffle 210 is made of a magnetically conductive material with a relative permeability greater than 1000. Selecting a magnetically conductive material with a relative permeability greater than 1000 as the core baffle 210 effectively enhances the magnetic properties of the motor 100's magnetic circuit, improves the transmission efficiency of magnetic flux, thereby reducing magnetic reluctance, lowering energy loss, and increasing the efficiency of the motor 100. The high relative permeability of the magnetically conductive material helps to concentrate and guide the magnetic field, making it more concentrated and uniformly distributed within the required area, which is beneficial for improving the performance of the motor 100. Using a magnetically conductive material with a high relative permeability as the core baffle 210 can reduce magnetic leakage, prevent 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. The high relative permeability of the magnetically conductive material helps to stabilize the operating state of the motor 100, reduce magnetic field fluctuations and instability factors, and improve the reliability and stability of the motor 100.

[0075] 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 magnet slot 224 of the rotor core 220. The narrower slot 223 of the core baffle 210 reduces magnetic field leakage, improves the efficiency of the rotor core 220, and reduces energy loss. The narrower slot 223 design also reduces the magnetic force influence between the cores, thus reducing noise and vibration during motor 100 operation.

[0076] Most existing motor products have an integral circular inner diameter stator. During motor operation, especially at high speeds, torque pulsation is large, and a large radial force is generated when the windings are energized. This causes the motor stator to vibrate under the excitation of radial electromagnetic force, which in turn causes the entire motor to vibrate and generate noise.

[0077] In related technologies, simply increasing the radial thickness of the stator-rotor air gap to reduce electromagnetic vibration and noise of the motor is insufficient, as it leads to a decrease in motor torque output.

[0078] Conventional methods for reducing electromagnetic excitation include adjusting the pole arc coefficient, changing the slot width, adding auxiliary slots, optimizing the rotor pole arc shape, and adjusting the tangential angle of the permanent magnet. Among these methods, changing the slot width and adding auxiliary slots can effectively weaken specific harmonic magnetic fields, but they can also lead to the deterioration of other harmonic magnetic fields.

[0079] Therefore, this invention proposes that the stator core of the motor adopts a design in which the two sections of the tooth tip share different centers, which has a significant effect on suppressing the radial electromagnetic force generated by the motor's harmonic magnetic field, thereby improving the air gap magnetic flux 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 tips 330 of the stator core 310. The tooth tips 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, which coincides with the center of the shaft hole 320. Multiple second tooth segments 350 share a second center 351, which is offset from the first center 341.

[0081] The technical solution of this invention increases the magnetic flux of the motor 100 by making the length of the rotor core 220 greater than the length of the stator core 310. This allows for greater output power within the same volume, increasing the power density of the motor 100. Increasing the length of the rotor core 220 also improves the magnetic circuit design of the motor 100, reduces magnetic reluctance, and enhances the uniformity of the magnetic field. Furthermore, the longer rotor core 220 reduces the magnetic reluctance between the rotor core 220 and the stator core 310, lowering core losses and thus improving the overall efficiency of the motor 100. This also helps improve the dynamic response characteristics of the motor 100, making it more stable and reliable during starting, acceleration, and deceleration. By adopting a shaft hole 320, compared with the existing integral circular stator inner diameter, the shape of the stator core is adjusted to a non-circular inner diameter, making the magnetic field more uniform at the stator inner diameter and reducing the influence of radial force. The shaft hole 320 has a larger radial thickness stator-rotor air gap, which helps to reduce the radial electromagnetic force density, thereby reducing the electromagnetic vibration and noise of motor 100 and weakening the cogging torque. At the same time, it has a smaller radial thickness stator-rotor air gap, which helps to increase the output torque of motor 100 and reduce the vibration and noise of motor 100 during operation.

[0082] Reference Figure 4To 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. 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. The second center 351 is obtained by moving a distance D1 along the X-axis and a distance D2 along the Y-axis. 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, which satisfies the relationship: D32=D12+D22, where 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, thus forming an asymmetric magnetic circuit. This optimizes the magnetic circuit design, makes the magnetic flux distribution more uniform, and improves the efficiency and output performance of the motor 100.

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

[0085] By optimizing the eccentric design of the shaft hole 320, radial fluctuations in the magnetic field can be reduced. Furthermore, the asymmetric magnetic circuit design between the stator and rotor allows for a more uniform distribution of magnetic flux reluctance at different locations, reducing reluctance non-uniformity and minimizing local saturation at tooth tips, thereby reducing the generation of air gap magnetic field harmonics. The asymmetric magnetic circuit design effectively reduces the concentration of the magnetic field at tooth tips, making the magnetic field more uniformly distributed throughout the entire magnetic circuit, reducing flux congestion and accumulation at tooth tips, lowering the magnetic flux density of the stator core 310, and thus reducing stator iron losses and the generation of magnetic field fluctuations and harmonics.

[0086] Specifically, in order to further reduce core loss, improve stability and reliability, and enhance the output performance of motor 100, thereby improving the overall performance level of motor 100, the air gap between rotor assembly 200 and 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 clearance is ensured between the rotor core 220 and the stator core 310, which is beneficial for optimizing the magnetic circuit design of the motor 100. This improves the uniformity of the magnetic field, reduces leakage flux, and thus enhances the efficiency and performance of the motor 100. Appropriate control of the air gap size can reduce core losses, improve the energy efficiency ratio of the motor 100, and extend its service life. Maintaining an appropriate air gap size helps reduce the asymmetry between the rotor core 220 and the stator core 310, improves the operational stability of the motor 100, reduces noise and vibration, and enhances the reliability of the motor 100.

[0088] To ensure the reasonableness of the air gap (g) between the rotor assembly 200 and the stator assembly 300, as well as the dimensions and positions of each component, the rotor assembly 200 has a radius of R1, and the stator core 310 includes multiple silicon steel sheets 360 with a thickness of T, satisfying the relationship: R1+R2+D2+g=2*R3+D1+T; where 0.4mm≤g≤0.8mm, 0.8mm≤D1≤1.2mm, 2.2mm≤D2≤2.8mm, and 0.35mm≤T≤0.5mm.

[0089] By defining these constraints, the positional relationship between the rotor assembly 200 and the stator assembly 300 can be effectively controlled, ensuring precise alignment during assembly and improving assembly accuracy. Reasonable control of the air gap between the rotor and stator, as well as the dimensional relationships of each component, helps reduce the adverse effects of magnetic reluctance and iron losses on the performance of the motor 100, thereby optimizing its performance and improving efficiency and stability. Ensuring reasonable gaps and positional relationships between components reduces wear and noise caused by friction and collision during operation, extending the service life of the motor 100 and improving its efficiency. A well-designed air gap between the rotor and stator reduces magnetic field leakage and iron losses, thus reducing the energy consumption of the motor 100 and improving energy utilization efficiency. Constraining the relationship R1+R2+D2+g=2*R3+D1+T helps ensure proper matching between components in the motor 100 design, thereby improving the performance, reliability, and efficiency of the motor 100.

[0090] To ensure the performance of motor 100, the magnets need to be fixed into the magnet slots 224. The mainstream fixing methods are: integral rotor injection molding / potting; applying adhesive between the magnets and the magnet slots 224; adding end plates at both ends of the rotor axis; and adding expansion material into the magnet slots 224. These methods require the use of various materials such as adhesives, plastics, and end plates for curing the rotor laminations and magnets, increasing production processes, resulting in low production efficiency and high production costs. Furthermore, under long-term exposure to refrigerants and lubricants, the adhesives and plastics are prone to compatibility issues, affecting product performance and even causing the permanent magnets to fail to hold the rotor core 220 securely, leading to malfunctions.

[0091] In this design, the rotor core 220 is provided with multiple magnet slots 224. The multiple magnet slots 224 are provided with fixing springs 226 and clearance slots 225 at intervals on one side of the rotation direction. When the magnet is placed in the magnet slot 224, the fixing springs 226 deform along the magnet insertion direction and are placed in the clearance slots 225. This can ensure the clearance fit between the magnet and the magnet slot 224, provide sufficient fixing strength for the magnet, and achieve simple assembly.

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

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

[0094] Specifically, the rotor core 220 includes multiple core laminations, each core lamination has a fixed spring 226 of M1 and a clearance groove 225 of M2, M2 = 2 * M1 and M1 = 2 * N, where N is an integer of 1 or 2.

[0095] For example, two fixed springs 226 are provided on a core lamination. According to the above-mentioned corresponding limitation relationship, the number of clearance slots 225 is four. The four clearance slots 225 and the two fixed springs 226 are arranged in the following relationship: the two adjacent fixed springs 226 of the rotor core 220 are spaced apart by P / 2-1 magnetic slots 224, where P is the number of rotor poles.

[0096] In this way, the fixing spring 226 after the magnet is inserted into the magnet slot 224 is guaranteed to fix the magnet, and interference between the fixing spring 226 and the iron core lamination is avoided during the axial deformation process, ensuring that the fixing spring 226 can be located in the relief slot 225 after deformation.

[0097] The present invention also proposes a compressor, which includes a motor 100. The specific structure of the motor 100 is as described in the above embodiments. Since the compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0098] The present invention also proposes a refrigeration device. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0099] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An electric motor, characterized in that, include: Stator assembly, including stator core; and The rotor assembly includes a magnet, a rotor core, and core baffles located at both ends of the rotor core. The rotor core is rotatably disposed within the stator assembly. The core baffles are made of a magnetically conductive material. Both the core baffles and the rotor core are provided with fixing slots, and fixing members are inserted into the fixing slots to fix the core baffles and the rotor core. The rotor core is provided with multiple magnet slots. The slot walls of the multiple magnet slots are provided with fixing springs and clearance slots at intervals on one side of the rotation direction. The magnets are placed in the magnet slots, and the fixing springs are deformed along the insertion direction of the magnets and placed in the clearance slots. The length of the rotor core is L1, and the length of the stator core is L2, where 1 / 3 ≤ L2 / L1 ≤ 1 / 2.

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

3. The motor as described in claim 2, characterized in that, The stator assembly further includes a stator coil, a first winding frame, and a second winding frame; the stator core includes a first stator segment, a stator body segment, and a second stator segment stacked sequentially. The first winding frame, the first stator segment, the stator body segment, the second stator segment, and the second winding frame are stacked sequentially along the axial direction, and the stator coils are respectively disposed in the first winding frame and the second winding frame; 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 body segment.

4. The motor as described in claim 3, characterized in that, The area of ​​the stator slots of the first stator segment and the second stator segment is S1, and 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 as described in claim 3, characterized in that, The length of the stator body segment is L3, and the lengths of the first stator segment and the second stator segment are both L4. L2 = L3 + 2 * L4, and 2mm ≤ L4 ≤ 2.5mm.

6. The motor as described in claim 1, characterized in that, The rotor core includes a first core segment and a second core segment stacked axially, wherein the inner diameter of the first core segment is larger than the inner diameter of the second core segment; the inner diameter of the shaft hole of the first core segment is D. a The inner diameter of the shaft hole of the second iron core section is D. b D a -D b >7mm, and D a <R1, where R1 is the radius of the rotor assembly.

7. The motor as described in 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, and the length of the rotor assembly is L1. L1 = L7 + L8 + 2 * L6, where 0.3mm ≤ L6 ≤ 1mm. The lengths of the first core segment and the second core segment satisfy the relationship: 1 ≤ L7 / L8 ≤ 5.

8. The motor as described in claim 6, characterized in that, The first core segment includes alternating layers of first core laminations and second core laminations, and the second core segment includes alternating layers of third core laminations and fourth core laminations. The outermost part of the upper end of the rotor core is the first core lamination, and the outermost part of the lower end of the rotor core is the fourth core lamination. The number of magnetic bridges between the first core lamination and the fourth core lamination near the shaft hole of the rotor core is W1, and the number of poles of the rotor is P, W1 = P; The number of magnetic bridges in the shaft holes of the second and third core laminations near the rotor core is W2, where W2 = P / 2.

9. The motor as described in claim 1, characterized in that, The relative permeability of the iron core baffle is >1000.

10. The motor as described in claim 1, characterized in that, The rotor core includes multiple core laminations stacked along the axial direction. The number of fixing springs on each core lamination is M1, and the number of clearance slots is M2. M2 = 2 * M1, and M1 = 2 * N, where N is an integer of 1 or 2. And / or, two adjacent fixed springs of the rotor core are spaced apart by P / 2-1 magnetic slots, where P is the number of rotor poles.

11. The motor as described in claim 1, characterized in that, The stator core includes multiple tooth tips that together enclose and define a shaft hole. Each tooth tip includes a first tooth segment and a second tooth segment. Multiple first tooth segments share a first center, and the rotation axis of the rotor core passes through the first center. Multiple second tooth segments share a second center, and the second center is offset from the first center. The distance from the center of the first circle to the edge of the first tooth segment is R3; establishing a rectangular coordinate system with the first circle as the origin, moving a distance D1 along the X-axis and a distance D2 along the Y-axis to obtain the second circle center, 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 Where 0.8mm≤D1≤1.2mm, 2.2mm≤D2≤2.8mm.

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

13. The motor as described in claim 12, characterized in that, The rotor assembly has a radius of R1, and the stator core comprises multiple silicon steel sheets with a thickness of T, satisfying the relationship: R1+R2+D2+g=2*R3+D1+T; where 0.4mm≤g≤0.8mm, 0.8mm≤D1≤1.2mm, 2.2mm≤D2≤2.8mm, and 0.35mm≤T≤0.5mm.

14. A compressor, characterized in that, Including the motor as described in any one of claims 1 to 13.

15. A refrigeration device, characterized in that, Includes the compressor as described in claim 14.

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