Stator assembly, motor and compressor

Abstract

The application provides a stator assembly, a motor and a compressor, and relates to the technical field of the compressor, and solves the technical problems of high copper loss of the motor and difficulty in improving the efficiency of the motor. The stator assembly comprises a stator lamination, and the stator lamination is provided with a stator tooth; the stator tooth comprises a first tooth edge and a second tooth edge, and the first tooth edge and the second tooth edge are arranged at an angle to form a wedge-shaped stator slot structure with one wide end and one narrow end between two adjacent stator teeth; and the first width bt2 of the stator tooth satisfies the following formula: 1.5 <= pi * delta p * L * W / (bt2 * P * lambda) <= 3.6; wherein, delta p is a pole arc coefficient of the motor, L and W are respectively a width and a thickness of a permanent magnet, P is a pole pair number, and lambda is a motor split ratio. The application realizes the purposes of improving the efficiency of the motor, reducing the tooth slot torque and weakening the vibration noise through the design of the stator tooth width, the optimization design of the tooth and shoe cutting edge, the permanent magnet of the rotor, the pole arc coefficient and the matching optimization design of the stator tooth.

Description

Technical Field

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

[0002] As a core component of electric drive systems for new energy vehicles and high-efficiency industrial motors, the operating efficiency of permanent magnet synchronous motors (PMSMs) directly determines the system's energy consumption and carbon emission levels. According to the IEC 60034-30 standard, a 1% increase in motor efficiency can result in global annual electricity savings of up to 10 billion kilowatt-hours (equivalent to reducing CO2 emissions by 5 million tons). In PMSMs, stator copper losses and core losses are key bottlenecks restricting efficiency improvements. Existing stator tooth profiles (tooth tip radius, tooth shoulder slope, tooth root transition curve, etc.) have limited ability to control local magnetic flux density distribution. Stator tooth profile is the core factor affecting motor copper and iron losses, and severe copper and iron losses severely restrict further breakthroughs in motor efficiency.

[0003] To improve motor efficiency, the prior art provides a permanent magnet synchronous motor with alternating poles and unequal tooth widths. The stator has an unequal tooth width structure, with armature teeth and auxiliary teeth having a certain proportion of tooth width. The central angles of the armature teeth and auxiliary teeth are not equal. The structure consists of alternating V-shaped permanent magnet poles and iron core poles. This structure can improve output torque and effectively reduce cogging torque and torque pulsation. However, alternating stator teeth of unequal width result in magnetic circuit asymmetry, significantly impacting motor vibration and noise. Furthermore, stator production with unequal-width alternating teeth is inconvenient during winding, easily reducing production efficiency. Existing technology also provides a coupled excitation motor system, whose motor body includes a stator, rotor, unipolar double-layer ring permanent magnet structure, and an integrated composite winding. The stator has the integrated composite winding, and the rotor has the unipolar double-layer ring permanent magnet, combining the excitation winding and armature winding into one. This system effectively suppresses motor torque pulsation, increases power / torque density, optimizes magnetization capability, reduces permanent magnet usage, lowers the risk of permanent magnet demagnetization, and significantly improves the reliability and stability of the motor system across a wide speed range. However, the slot shape is more complex, and stator winding production remains problematic, making mechanized production difficult and challenging. Summary of the Invention

[0004] The purpose of this invention is to provide a stator assembly, a motor, and a compressor to solve the technical problems of high copper loss and difficulty in improving motor efficiency in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a stator assembly including a stator lamination having stator teeth; each stator tooth includes a first tooth edge and a second tooth edge, the first tooth edge and the second tooth edge being arranged at an angle to form a wedge-shaped stator groove structure with one end wider than the other between two adjacent stator teeth; the first width bt2 of the stator tooth satisfies the following formula: 1.5≤π*δp*L*W / (bt2*P*λ)≤3.6; where δp is the pole arc coefficient of the motor, L and W are the width and thickness of the permanent magnet, respectively, P is the number of pole pairs, and λ is the motor split ratio.

[0006] The stator assembly of this invention effectively controls the air gap magnetic flux density distribution and reduces the magnetic saturation of the teeth by optimizing the geometric structure and dimensional parameters of the stator teeth, thereby significantly reducing iron losses. The wedge-shaped stator slot structure helps improve winding distribution, increase slot fill factor, and reduce copper wire length, thus reducing copper losses. This design ensures output performance while taking into account manufacturing feasibility, facilitating automated winding, and solving the manufacturing difficulties caused by traditional unequal tooth widths or complex slot shapes, providing a feasible path for the large-scale application of high-efficiency motors.

[0007] As a further improvement of the present invention, the second width bt1 and the first width bt2 of the stator teeth satisfy the following formula: 2*bt1 / 3≤bt2≤5*bt1 / 6.

[0008] This invention further optimizes the magnetic flux path distribution by reasonably matching the second width and the first width, avoiding excessively high local magnetic flux density and effectively suppressing core saturation. At the same time, this proportional relationship helps to improve the mechanical strength of the stator structure and ensure the stability of the laminations under high-speed rotation conditions.

[0009] As a further improvement of the present invention, the stator tooth includes a stator tooth shoe; the tip of the stator tooth shoe is provided with a tangent portion; the thickness a2 of the tangent portion and the thickness a1 of the stator tooth shoe satisfy the following relationship: 0.5≤a2 / a1≤0.85.

[0010] This invention effectively reduces magnetic concentration at the tip of the stator gear shoe by setting a tangential edge, thereby reducing local eddy current losses and improving the air gap magnetic field waveform, making the magnetomotive force distribution more sinusoidal. This weakens the influence of higher harmonics and improves the smoothness of motor operation. While ensuring optimized electromagnetic performance, this structure also takes into account the feasibility of stamping die processing, avoids the risk of cracking caused by stress concentration at sharp corners, and enhances product reliability and durability.

[0011] As a further improvement of the present invention, the stator tooth shoe width b1 and the tangent width b2 satisfy the following relationship: 0.75≤b2 / b1≤0.9.

[0012] This ratio effectively balances the magnetic flux carrying capacity and eddy current suppression requirements of the toothed shoe section, further optimizing the air gap magnetic field distribution. The reasonable limitation of the cut edge width not only avoids local saturation caused by abrupt changes in the magnetic circuit cross section, but also enhances the overall rigidity of the toothed shoe structure, which is conducive to improving the dynamic response performance and noise and vibration performance of the motor under high load conditions.

[0013] As a further improvement of the present invention, the first tooth edge and / or the second tooth edge comprises two tooth segments connected end to end, namely a first tooth segment and a second tooth segment; the first tooth segment and the second tooth segment are connected by a transition arc; the radius R1 of the transition arc satisfies the following relationship: R1≤(Dd-eb)*tan(α / 2) / 6, where: α is the angle formed by the intersection of the first tooth segment and the second tooth segment, eb is the width of the stator yoke; D is the outer diameter of the stator lamination; d is the inner diameter of the stator lamination.

[0014] This transition arc structure effectively alleviates stress concentration at the tooth edge corners, improving the structural integrity of the stator laminations during stamping and stacking processes. Simultaneously, it optimizes the magnetic field line distribution path, reducing the risk of local magnetic flux distortion and further suppressing iron loss. Combined with precise geometric constraints, this design significantly enhances mold life and manufacturing consistency while ensuring electromagnetic performance, meeting the engineering requirements of large-scale precision manufacturing.

[0015] As a further improvement of the present invention, the range of the pole arc coefficient δp of the motor is: 0.6≤δp≤0.85,=a / b,where δp=a / b,a is the central angle corresponding to the upper end of the permanent magnet; b is the angle corresponding to each pole.

[0016] This invention effectively optimizes the matching relationship between the magnetic field coverage area of ​​the permanent magnet and the pole pitch by reasonably limiting the pole arc coefficient δp to the range of 0.6 to 0.85. This ensures sufficient main air gap magnetic flux density while avoiding the increase in leakage flux caused by mutual interference between adjacent pole magnetic flux. This design significantly improves the torque output capability and efficiency peak range of the motor, while suppressing the no-load back EMF harmonic content, reducing cogging torque pulsation, and further improving the smoothness of operation and noise characteristics. It is suitable for drive system applications with high power density and low vibration and noise requirements.

[0017] As a further improvement of the present invention, the stator breakage ratio range is 0.48≤λ≤0.66, where λ=d / D, d is the inner diameter of the stator lamination, and D is the outer diameter of the stator lamination.

[0018] The stator split ratio λ of this invention is controlled within the range of 0.48 to 0.66, balancing the utilization rate of the slot area with the magnetic flux carrying capacity of the yoke. This range effectively balances the electromagnetic load distribution, avoiding magnetic saturation due to an excessively thin yoke or material waste due to an excessively thick yoke, while improving the efficiency of the heat dissipation path and enhancing the thermal stability during continuous operation. Combined with a reasonable pole arc coefficient and optimized tooth geometry, the sinusoidal waveform of the air gap magnetic flux density is further improved, the content of higher harmonics is reduced, and the power factor and torque density are increased, meeting the design requirements of high-efficiency and energy-saving motors.

[0019] This invention provides an electric motor, including a rotor assembly and a stator assembly. The rotor assembly includes rotor laminations, each lamination having a magnetic slot, and a permanent magnet arranged within the magnetic slot. The length of the permanent magnet is L, and the width of the permanent magnet is W; the central angle corresponding to the upper end point of the permanent magnet is α, and the number of pole pairs of the motor is P≥2. The angle corresponding to each pole is b.

[0020] The present invention provides a compressor, including the motor. Attached Figure Description

[0021] 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 these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the motor according to the first embodiment of the present invention; Figure 2 yes Figure 1 Enlarged view of part A in the middle; Figure 3 yes Figure 1 Enlarged view of part B in the middle; Figure 4 This is a schematic diagram of the structure of the motor according to the second embodiment of the present invention; Figure 5 yes Figure 4 Enlarged view of the central Z region; Figure 6 This is a schematic diagram of the structure of the motor according to the third embodiment of the present invention; Figure 7 yes Figure 6 Enlarged view of the middle Y region; Figure 8 This is a schematic diagram of the rotor assembly of the present invention; Figure 9 This is a schematic diagram of the structure of one embodiment of the stator assembly of the present invention; Figure 10These are diagrams showing the iron loss of motors in several embodiments of the motor of the present invention; Figure 11 These are motor efficiency diagrams for several embodiments of the motor of the present invention; Figure 12 These are copper loss diagrams for several embodiments of the motor of the present invention; Figure 13 This is a schematic diagram of the stator assembly in the prior art; Figure 14 This is a structural schematic diagram of the fourth embodiment of the motor of the present invention.

[0023] In the picture: 1. Stator laminations; 2. Rotor laminations; 3. Magnetic steel channel; 4. Permanent magnet; 11. Stator teeth; 111. First tooth edge; 112. Second tooth edge; 113. First tooth segment; 114. Second tooth segment; 115. Stator toothed shoe; 116. Toothed boot tip; 117. Cut edge; bt1, second width; bt2, First Width; a1. Custom toothed boot thickness; a2. Thickness of the cut edge; b1. Width of stator tooth shoe; b2. Width of the cut edge; eb, stator yoke width; D. Stator lamination outer diameter; d. Stator lamination inner diameter; L represents the length of the permanent magnet. W, width of permanent magnet; a. The central angle corresponding to the upper end point of the permanent magnet; b. The angle corresponding to each pole. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] Example 1: This invention provides a stator assembly, including a stator lamination 1, wherein the stator lamination 1 has stator teeth 11; a stator slot is formed between adjacent stator teeth 11; each stator tooth 11 includes a first tooth edge 111 and a second tooth edge 112 disposed opposite to each other, the first tooth edge 111 and the second tooth edge 112 being non-parallel structures and being disposed at an included angle to form a wedge-shaped stator slot structure with one end wider than the other between two adjacent stator teeth 11; as shown Figure 1 As shown, in this embodiment, the first tooth edge 111 and the second tooth edge 112 are arranged in a V shape, with the smaller end close to the outer edge of the stator lamination 1 and the larger end close to the center of the stator lamination 1. Thus, the size of the stator slot gradually increases from the outer edge of the stator lamination 1 towards the center.

[0026] Furthermore, in this embodiment, as Figure 1 and Figure 3 As shown, the first width bt2 of the stator tooth 11 satisfies the following formula: 1.5≤π*δp*L*W / (bt2*P*λ)≤3.6; where δp is the pole arc coefficient of the motor, L and W are the width and thickness of the permanent magnet 4, respectively, P is the number of pole pairs, and λ is the motor split ratio.

[0027] It should be noted that, in this embodiment, the first width bt2 of the stator tooth 11 is the width at the root of the stator tooth 11.

[0028] The stator assembly of this invention effectively controls the air gap magnetic flux density distribution and reduces the magnetic saturation of the teeth by optimizing the geometric structure and dimensional parameters of the stator teeth 11, thereby significantly reducing iron losses. The wedge-shaped stator slot structure helps improve winding distribution, increase slot fill factor, and reduce copper wire length, thus reducing copper losses. This design ensures output performance while taking into account manufacturing feasibility, facilitating automated winding, and solving the manufacturing difficulties caused by traditional unequal tooth widths or complex slot shapes, providing a feasible path for the large-scale application of high-efficiency motors.

[0029] Furthermore, the second width bt1 and the first width bt2 of the stator tooth 11 satisfy the following formula: 2*bt1 / 3≤bt2≤5*bt1 / 6. It should be noted that the second width bt1 is the width of the stator tooth 11 near the shoe part. The setting of this dimensional relationship effectively balances the contradiction between the magnetic circuit current carrying capacity and mechanical strength, which not only ensures the smooth passage of magnetic flux in the tooth part, but also enhances the structural rigidity of the stator tooth 11 and prevents deformation during stamping and assembly.

[0030] This invention further optimizes the magnetic flux path distribution by reasonably matching the second width and the first width, avoiding excessively high local magnetic flux density and effectively suppressing core saturation. At the same time, this proportional relationship helps to improve the mechanical strength of the stator structure and ensure the stability of the laminations under high-speed rotation conditions.

[0031] As an optional embodiment of the present invention, such as Figures 1-3 As shown, the stator tooth 11 includes a stator tooth shoe 115; a tangent portion 117 is provided at the tooth shoe tip 116 of the stator tooth shoe 115; the thickness a2 of the tangent portion 117 and the thickness a1 of the stator tooth shoe 115 satisfy the following relationship: 0.5≤a2 / a1≤0.85.

[0032] It should be noted that the thickness a1 of the stator tooth shoe 115 refers to the radial thickness from the outer edge to the inner edge of the stator tooth shoe 115, and the thickness a2 of the tangent portion 117 refers to the radial thickness from the outer edge of the tangent portion 117 to the inner edge of the stator tooth shoe 115. The tangent portion 117 effectively reduces the magnetic flux density phenomenon at the edge of the tooth shoe, suppresses local eddy current losses, and improves the manufacturability during winding insertion.

[0033] This invention effectively reduces magnetic concentration at the tip 116 of the stator gear shoe 115 by providing a tangent 117, thereby reducing local eddy current losses and improving the air gap magnetic field waveform, making the magnetomotive force distribution more sinusoidal. This weakens the influence of higher harmonics and improves the smoothness of motor operation. While ensuring optimized electromagnetic performance, this structure also considers the feasibility of stamping die processing, avoids the risk of cracking caused by stress concentration at sharp corners, and enhances product reliability and durability.

[0034] In this embodiment, as Figure 3 As shown, the width b1 of the stator tooth shoe 115 and the width b2 of the cut edge portion 117 satisfy the following relationship: 0.75≤b2 / b1≤0.9.

[0035] This ratio effectively balances the magnetic flux carrying capacity and eddy current suppression requirements of the toothed shoe section, further optimizing the air gap magnetic field distribution. The reasonable limitation of the 117 width of the cut edge not only avoids local saturation caused by abrupt changes in the magnetic circuit cross section, but also enhances the overall rigidity of the toothed shoe structure, which is conducive to improving the dynamic response performance and noise and vibration performance of the motor under high load conditions.

[0036] As a further improvement of the present invention, the range of the pole arc coefficient δp of the motor is: 0.6≤δp≤0.85, =a / b, where δp=a / b, as shown in the example. Figure 8 As shown, a is the central angle corresponding to the upper end of permanent magnet 4; b is the angle corresponding to each pole.

[0037] This invention effectively optimizes the matching relationship between the magnetic field coverage area and the pole pitch of the permanent magnet 4 by reasonably limiting the pole arc coefficient δp to the range of 0.6 to 0.85. This ensures sufficient main air gap magnetic flux density while avoiding the increase in leakage flux caused by mutual interference between adjacent pole magnetic flux. This design significantly improves the torque output capability and efficiency peak range of the motor, while suppressing the no-load back EMF harmonic content, reducing cogging torque pulsation, and further improving the smoothness of operation and noise characteristics. It is suitable for drive system applications with high power density and low vibration and noise requirements.

[0038] As a further improvement of the present invention, the stator breakage ratio range is 0.48≤λ≤0.66, where λ=d / D, d is the inner diameter of stator lamination 1, and D is the outer diameter of stator lamination 1.

[0039] The stator split ratio λ of this invention is controlled within the range of 0.48 to 0.66, balancing the utilization rate of the slot area with the magnetic flux carrying capacity of the yoke. This range effectively balances the electromagnetic load distribution, avoiding magnetic saturation due to an excessively thin yoke or material waste due to an excessively thick yoke, while improving the efficiency of the heat dissipation path and enhancing the thermal stability during continuous operation. Combined with a reasonable pole arc coefficient and optimized tooth geometry, the sinusoidal waveform of the air gap magnetic flux density is further improved, the content of higher harmonics is reduced, and the power factor and torque density are increased, meeting the design requirements of high-efficiency and energy-saving motors.

[0040] In this embodiment, the number of pole pairs P of the motor is ≥ 2.

[0041] In this invention, the width of each tooth in the stator is not equal from the tooth shoe to the tooth root; the central angle of the stator tooth shoe 115 is the same; by designing the chamfer at the tip of the stator tooth shoe 115, an uneven air gap is formed, reducing torque pulsation and weakening motor vibration noise; the rotor magnet size and pole arc coefficient are related to the minimum tooth width of the stator, reducing motor iron loss and improving motor efficiency; through the unequal tooth design, the stator slot area is increased, the motor resistance is reduced, iron loss is reduced, and motor efficiency is improved. Example 2: In this embodiment, the present invention provides a stator assembly, including a stator lamination 1, wherein the stator lamination 1 has stator teeth 11; a stator slot is formed between adjacent stator teeth 11; the stator teeth 11 include a first tooth edge 111 and a second tooth edge 112 disposed opposite to each other, the first tooth edge 111 and the second tooth edge 112 are non-parallel structures, and are disposed at an included angle to form a wedge-shaped stator slot structure with one end wider than the other between two adjacent stator teeth 11; as shown Figures 6-7 As shown, in this embodiment, the first tooth edge 111 and the second tooth edge 112 are arranged in a V shape, with the smaller end close to the center of the stator lamination 1 and the larger end close to the outer edge of the stator lamination 1. Thus, the size of the stator slot decreases sequentially from the outer edge of the stator lamination 1 towards the center.

[0042] Furthermore, in this embodiment, as Figure 6 and Figure 7 As shown, the first width bt2 of the stator tooth 11 satisfies the following formula: 1.5≤π*δp*L*W / (bt2*P*λ)≤3.6; where δp is the pole arc coefficient of the motor, L and W are the width and thickness of the permanent magnet 4, respectively, P is the number of pole pairs, and λ is the motor split ratio.

[0043] It should be noted that, in this embodiment, the first width bt2 of the stator tooth 11 is the width of the stator tooth 11 near the boot part.

[0044] The stator assembly of this invention effectively controls the air gap magnetic flux density distribution and reduces the magnetic saturation of the teeth by optimizing the geometric structure and dimensional parameters of the stator teeth 11, thereby significantly reducing iron losses. The wedge-shaped stator slot structure helps improve winding distribution, increase slot fill factor, and reduce copper wire length, thus reducing copper losses. This design ensures output performance while taking into account manufacturing feasibility, facilitating automated winding, and solving the manufacturing difficulties caused by traditional unequal tooth widths or complex slot shapes, providing a feasible path for the large-scale application of high-efficiency motors.

[0045] Furthermore, the second width bt1 and the first width bt2 of the stator tooth 11 satisfy the following formula: 2*bt1 / 3≤bt2≤5*bt1 / 6. It should be noted that the second width bt1 is the width of the stator tooth 11 near the root. This dimensional relationship effectively balances the contradiction between the magnetic flux carrying capacity and mechanical strength, ensuring the smooth passage of magnetic flux in the tooth and enhancing the structural rigidity of the stator tooth 11 to prevent deformation during stamping and assembly.

[0046] This invention further optimizes the magnetic flux path distribution by reasonably matching the second width and the first width, avoiding excessively high local magnetic flux density and effectively suppressing core saturation. At the same time, this proportional relationship helps to improve the mechanical strength of the stator structure and ensure the stability of the laminations under high-speed rotation conditions.

[0047] As an optional embodiment of the present invention, such as Figures 6-7 As shown, the stator tooth 11 includes a stator tooth shoe 115; a tangent portion 117 is provided at the tooth shoe tip 116 of the stator tooth shoe 115; the thickness a2 of the tangent portion 117 and the thickness a1 of the stator tooth shoe 115 satisfy the following relationship: 0.5≤a2 / a1≤0.85.

[0048] It should be noted that the thickness a1 of the stator tooth shoe 115 refers to the radial thickness from the outer edge to the inner edge of the stator tooth shoe 115, and the thickness a2 of the tangent portion 117 refers to the radial thickness from the outer edge of the tangent portion 117 to the inner edge of the stator tooth shoe 115. The tangent portion 117 effectively reduces the magnetic flux density phenomenon at the edge of the tooth shoe, suppresses local eddy current losses, and improves the manufacturability during winding insertion.

[0049] It should be noted that, Figure 6 and Figure 7 The figures do not include labels a1, a2, b1, and b2; please refer to [the provided text]. Figure 1 The identifier in the text.

[0050] This invention effectively reduces magnetic concentration at the tip 116 of the stator gear shoe 115 by providing a tangent 117, thereby reducing local eddy current losses and improving the air gap magnetic field waveform, making the magnetomotive force distribution more sinusoidal. This weakens the influence of higher harmonics and improves the smoothness of motor operation. While ensuring optimized electromagnetic performance, this structure also considers the feasibility of stamping die processing, avoids the risk of cracking caused by stress concentration at sharp corners, and enhances product reliability and durability.

[0051] In this embodiment, as Figure 6 and Figure 7 As shown, the width b1 of the stator tooth shoe 115 and the width b2 of the cut edge portion 117 satisfy the following relationship: 0.75≤b2 / b1≤0.9.

[0052] This ratio effectively balances the magnetic flux carrying capacity and eddy current suppression requirements of the toothed shoe section, further optimizing the air gap magnetic field distribution. The reasonable limitation of the 117 width of the cut edge not only avoids local saturation caused by abrupt changes in the magnetic circuit cross section, but also enhances the overall rigidity of the toothed shoe structure, which is conducive to improving the dynamic response performance and noise and vibration performance of the motor under high load conditions.

[0053] As a further improvement of the present invention, the range of the pole arc coefficient δp of the motor is: 0.6≤δp≤0.85, =a / b, where δp=a / b, as shown in the example. Figure 8 As shown, a is the central angle corresponding to the upper end of permanent magnet 4; b is the angle corresponding to each pole.

[0054] This invention effectively optimizes the matching relationship between the magnetic field coverage area and the pole pitch of the permanent magnet 4 by reasonably limiting the pole arc coefficient δp to the range of 0.6 to 0.85. This ensures sufficient main air gap magnetic flux density while avoiding the increase in leakage flux caused by mutual interference between adjacent pole magnetic flux. This design significantly improves the torque output capability and efficiency peak range of the motor, while suppressing the no-load back EMF harmonic content, reducing cogging torque pulsation, and further improving the smoothness of operation and noise characteristics. It is suitable for drive system applications with high power density and low vibration and noise requirements.

[0055] As a further improvement of the present invention, the stator breakage ratio range is 0.48≤λ≤0.66, where λ=d / D, d is the inner diameter of stator lamination 1, and D is the outer diameter of stator lamination 1.

[0056] The stator split ratio λ of this invention is controlled within the range of 0.48 to 0.66, balancing the utilization rate of the slot area with the magnetic flux carrying capacity of the yoke. This range effectively balances the electromagnetic load distribution, avoiding magnetic saturation due to an excessively thin yoke or material waste due to an excessively thick yoke, while improving the efficiency of the heat dissipation path and enhancing the thermal stability during continuous operation. Combined with a reasonable pole arc coefficient and optimized tooth geometry, the sinusoidal waveform of the air gap magnetic flux density is further improved, the content of higher harmonics is reduced, and the power factor and torque density are increased, meeting the design requirements of high-efficiency and energy-saving motors.

[0057] In this embodiment, the number of pole pairs P of the motor is ≥ 2.

[0058] Example 3: In this embodiment, as Figure 4 and Figure 5 As shown, the present invention provides a stator assembly, including a stator lamination 1, the stator lamination 1 having stator teeth 11; a stator groove is formed between adjacent stator teeth 11; the stator teeth 11 include a first tooth edge 111 and a second tooth edge 112 disposed opposite to each other, the first tooth edge 111 and the second tooth edge 112 having a non-parallel structure, and being disposed at an included angle to form a wedge-shaped stator groove structure with one end wider than the other between two adjacent stator teeth 11; as shown Figures 4-5 As shown, in this embodiment, the first tooth edge 111 and / or the second tooth edge 112 include two tooth segments connected end to end, namely the first tooth segment 113 and the second tooth segment 114; the first tooth segment 113 and the second tooth segment 114 are not connected by a straight line but have an included angle structure, and the connection point is not a right angle structure. Specifically, the first tooth segment 113 and the second tooth segment 114 are connected by a transition arc; the radius R1 of the transition arc satisfies the following relationship: R1≤(Dd-eb)*tan(α / 2) / 6, where: α is the angle formed by the intersection of the first tooth segment 113 and the second tooth segment 114, eb is the width of the stator yoke; D is the outer diameter of the stator lamination 1; d is the inner diameter of the stator lamination 1.

[0059] It should be noted that this embodiment can form two structures by adjusting the tilt direction of the first tooth segment 113 and the second tooth segment 114, such as... Figure 14 As shown, one type has a wider stator slot at the location of the first tooth segment 113 and a narrower stator slot at the location of the second tooth segment 114; another type is, as shown... Figure 4 As shown, the stator slot where the first tooth segment 113 is located is narrow, while the stator slot where the second tooth segment 114 is located is wide.

[0060] The transition arc structure effectively alleviates stress concentration at the tooth edge corner, improving the structural integrity of stator lamination 1 during stamping and stacking processes. Simultaneously, it optimizes the magnetic field line distribution path, reducing the risk of local magnetic flux distortion and further suppressing iron loss. Combined with precise geometric constraints, this design significantly enhances mold life and manufacturing consistency while ensuring electromagnetic performance, meeting the engineering requirements of large-scale precision manufacturing.

[0061] As a further improvement of the present invention, the range of the pole arc coefficient δp of the motor is: 0.6≤δp≤0.85,=a / b,where δp=a / b,a is the central angle corresponding to the upper end of permanent magnet 4; b is the angle corresponding to each pole.

[0062] This invention effectively optimizes the matching relationship between the magnetic field coverage area and the pole pitch of the permanent magnet 4 by reasonably limiting the pole arc coefficient δp to the range of 0.6 to 0.85. This ensures sufficient main air gap magnetic flux density while avoiding the increase in leakage flux caused by mutual interference between adjacent pole magnetic flux. This design significantly improves the torque output capability and efficiency peak range of the motor, while suppressing the no-load back EMF harmonic content, reducing cogging torque pulsation, and further improving the smoothness of operation and noise characteristics. It is suitable for drive system applications with high power density and low vibration and noise requirements.

[0063] As a further improvement of the present invention, the stator breakage ratio range is 0.48≤λ≤0.66, where λ=d / D, d is the inner diameter of stator lamination 1, and D is the outer diameter of stator lamination 1.

[0064] The stator split ratio λ of this invention is controlled within the range of 0.48 to 0.66, balancing the utilization rate of the slot area with the magnetic flux carrying capacity of the yoke. This range effectively balances the electromagnetic load distribution, avoiding magnetic saturation due to an excessively thin yoke or material waste due to an excessively thick yoke, while improving the efficiency of the heat dissipation path and enhancing the thermal stability during continuous operation. Combined with a reasonable pole arc coefficient and optimized tooth geometry, the sinusoidal waveform of the air gap magnetic flux density is further improved, the content of higher harmonics is reduced, and the power factor and torque density are increased, meeting the design requirements of high-efficiency and energy-saving motors.

[0065] Example 4: In this embodiment, as Figures 1-11 As shown, the present invention provides an electric motor, including a rotor assembly and a stator assembly. The rotor assembly includes rotor laminations 2, on which magnetic slots 3 are provided for placing permanent magnets 4. The permanent magnets 4 are arranged within the magnetic slots 3. The length of the permanent magnet 4 is L, and the width of the permanent magnet 4 is W. The central angle corresponding to the upper end point of the permanent magnet 4 is α, and the number of pole pairs P of the motor is ≥ 2. The angle corresponding to each pole is b.

[0066] A stator assembly includes a stator lamination 1, the stator lamination 1 having stator teeth 11; a stator slot is formed between adjacent stator teeth 11; the stator teeth 11 include a first tooth edge 111 and a second tooth edge 112 disposed opposite to each other, the first tooth edge 111 and the second tooth edge 112 are non-parallel structures, and are disposed at an angle to form a wedge-shaped stator slot structure with one end wider than the other between two adjacent stator teeth 11.

[0067] The stator tooth width 11 affects motor performance and cost. A reasonable tooth width is beneficial to improving motor performance and reducing motor cost. To reduce motor copper and iron losses and improve motor performance, and to maximize motor efficiency, the minimum stator tooth width must satisfy: 1.5≤π*δp*L*W / (bt2*P*λ)≤3.6, where δp is the motor pole arc coefficient, L and W are the length and width of the permanent magnet 4, P is the number of pole pairs, and λ is the motor split ratio. The stator tooth 11 of this invention is a non-uniform width tooth. To ensure motor performance and prevent excessive magnetic flux density at the minimum tooth width, which would lead to a non-linear increase in stator iron loss, the two widths on the stator lamination 1 satisfy the relationship: 2*bt1 / 3≤bt2≤5*bt1 / 6. The minimum tooth width is affected by the size of the magnet and the pole arc coefficient of the motor. In order to optimize the magnetic flux distribution, reduce harmonic losses, improve torque output and efficiency, and maximize motor performance, the pole arc coefficient of the motor should satisfy the following relationship: 0.6≤δp≤0.85. This coefficient represents the ratio of the actual angle occupied by the permanent magnet 4 under each pole of the rotor to the total angle occupied by each pole, that is, the ratio of a / b. This coefficient characterizes the size of the V angle of the V-shaped permanent magnet 4. When the width of the permanent magnet 4 is constant, the smaller the pole arc coefficient, the smaller a and the smaller the V angle, and vice versa.

[0068] As mentioned above, this range is ensured by designing the size of the 4V angle of the permanent magnet. This range affects the distribution and amplitude of the air gap magnetic field of the motor, and has an important impact on motor performance, cogging torque, etc. The value varies depending on the motor design scheme; a is the central angle of the upper end of the magnet, and b is the angle occupied by each pole.

[0069] To ensure that the motor is suitable for the corresponding operating conditions under the compressor displacement requirements, the number of pole pairs P of the motor should be greater than or equal to 2. To prevent excessive magnetic flux density and stator iron loss, which would reduce motor efficiency, the stator split ratio must be within the range of 0.48 ≤ λ ≤ 0.66. The stator split ratio is the ratio of the stator's inner diameter to its outer diameter, i.e., the ratio of d / D. This value is determined by designing the stator's inner and outer diameter dimensions to ensure this range based on actual production needs.

[0070] In this embodiment, to reduce the increase in tooth groove torque caused by the change in the shape of the stator teeth 11, resulting in excessive motor torque pulsation and deterioration of vibration and noise, the stator tooth shoe 115 is shaped. The thickness a2 of the stator tooth shoe 115 and the dimensions a1, a2, b1, b2 of the shaped portion 117 formed by the shaped portion 117 of the stator tooth shoe 115 satisfy the following relationship: 0.5≤a2 / a1≤0.85, 0.75≤b2 / b1≤0.9, where a1 is the thickness of the stator tooth shoe 115, a2 is the thickness of the shaped portion 117, b1 is the width of the stator tooth shoe 115, and b2 is the width of the shaped portion 117.

[0071] The non-uniform tooth design of this invention allows for adjustment of the tooth position according to actual production needs, ensuring an optimal motor solution during production. Specifically, four non-uniform tooth design structures are provided: Non-uniform width teeth can extend from the middle of the tooth or any position from the tooth shoe to the tooth root towards the tooth root while gradually decreasing the tooth width. The dimensional relationship between the maximum and minimum tooth widths satisfies the following formulas: 1.5≤π*δp*L*W / (bt2*P*λ)≤3.6, 2*bt1 / 3≤bt2≤5*bt1 / 6; Non-uniform width teeth extend from the middle of the tooth or any position from the tooth shoe to the tooth root towards the tooth shoe while gradually decreasing the tooth width. The dimensional relationship between the maximum tooth width and the minimum tooth width satisfies the following formula: 1.5≤π*δp*L*W / (bt2*P*λ)≤3.6, 2*bt1 / 3≤bt2≤5*bt1 / 6; Non-uniform width teeth can extend from the middle of the tooth or any position from the tooth shoe to the tooth root towards the tooth root while gradually decreasing the tooth width. The dimensional relationship between the maximum and minimum tooth widths satisfies the following formula: 1.5≤π*δp*L*W / (bt2*P*λ)≤3.6, 2*bt1 / 3≤bt2≤5*bt1 / 6. To ensure that there is a sudden change in magnetic flux density at the junction of tooth width changes (i.e., the intersection of the first tooth segment 113 and the second tooth segment 114), which would cause a nonlinear increase in iron loss, a circular arc is used to connect the two. The chamfer radius of the circular arc R1 satisfies the following relationship: R1≤(Dd-eb)*tan(α / 2) / 6, where: α is the included angle formed by the intersection of the first tooth segment 113 and the second tooth segment 114, and eb is the width of the stator yoke. Non-uniform width teeth extend from the middle of the tooth or any position from the tooth shoe to the tooth root towards the tooth shoe while gradually decreasing in width. The dimensional relationship between the maximum and minimum tooth widths satisfies the following formulas: 1.5≤π*δp*L*W / (bt2*P*λ)≤3.6, 2*bt1 / 3≤bt2≤5*bt1 / 6. To ensure that there is a sudden change in magnetic flux density at the junction of tooth width changes (i.e., the intersection of the first tooth segment 113 and the second tooth segment 114), which would cause a nonlinear increase in iron loss, a circular arc is used to connect the two. The chamfer radius of the circular arc R1 satisfies the following relationship: R1≤(Dd-eb)*tan(α / 2) / 6, where: α is the angle formed by the intersection of the first tooth segment 113 and the second tooth segment 114, and eb is the width of the stator yoke. In the design of permanent magnet synchronous motors, the stator tooth profile, rotor permanent magnet dimensions, and pole arc coefficient are among the core factors affecting motor performance. Traditional tooth profile designs have significant limitations in terms of magnetic flux distribution; they are prone to causing local saturation of the magnetic circuit, increasing iron losses and reducing efficiency. Optimizing the tooth profile can reduce local saturation of the magnetic circuit, improve magnetic flux distribution, thereby reducing iron losses and improving overall efficiency.

[0072] like Figure 10 , Figure 11 and Figure 12 The figures show a bar chart comparing the iron loss and efficiency of the motor before and after the improvement, as well as a comparison chart of the copper loss. The original design in the figures refers to a design where the stator lamination teeth are of uniform width and the stator tooth shoes have not undergone edge trimming optimization (e.g., ...). Figure 13As shown), motor efficiency is the ratio of motor output power to motor input power. The difference between the motor's input and output power represents the motor's losses, mainly including copper losses and iron losses. Therefore, the higher the copper and iron losses, the lower the motor efficiency. The horizontal axis represents the motor's iron losses and efficiency at three frequency points: 20Hz, 40Hz, and 60Hz. Taking 20Hz as an example, the original design has the highest copper and iron losses. Figure 10 and Figure 12 The histogram corresponding to 20Hz indicates that the motor efficiency is the lowest. Figure 11 The bar chart corresponds to 20Hz. Although the iron loss of the other four schemes is similar, the efficiency of scheme four is the highest (scheme four is the optimal embodiment) because the copper loss is the lowest; the same applies to 40Hz and 60Hz.

[0073] From 20-60Hz, as the motor frequency increases, both motor efficiency and copper and iron losses increase.

[0074] The first scheme in the figure is a bar chart of the stator assembly in Embodiment 3; Option 2 is another structure of the stator assembly in Example 3 (such as...) Figure 14 The bar chart shown below; Scheme 3 is a bar chart of the stator assembly in Example 2; Scheme 4 is a bar chart of the stator assembly in Example 1.

[0075] Example 5: The present invention provides a compressor, comprising as follows: Figures 1-11 The motor shown.

[0076] The compressor of this invention achieves a synergistic reduction in both copper and iron losses by improving the stator tooth profile 11 on the stator lamination 1, optimizing the geometric parameters of the rotor permanent magnet 4, and the pole arc coefficient. Specifically, the optimized tooth profile significantly increases the effective slot area, shortening the average length of the winding conductor and increasing the wire diameter under the same number of winding turns and slot fill factor. The reduction in average length directly leads to a decrease in resistance, thereby reducing copper losses. The rotor permanent magnet 4 and the pole arc coefficient optimize the magnetic flux distribution, reducing local saturation of the magnetic circuit. At the same time, they reduce the sudden increase in local magnetic flux density above the saturation point caused by abrupt changes in magnetic flux density gradient at the tooth root and tooth tip. By optimizing the tooth profile, the sudden changes in magnetic flux density at the tooth part are suppressed, resulting in a nonlinear decrease in iron losses. By optimizing the stator tangent, the distribution of magnetic flux and magnetic reluctance is changed, reducing cogging torque and weakening motor vibration and noise.

[0077] First, it should be noted that "inward" refers to the direction towards the center of the storage space, while "outward" refers to the direction away from the center of the storage space.

[0078] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the purpose of facilitating and simplifying the description of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0079] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0080] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0081] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0082] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0083] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A stator assembly, characterized in that, The stator includes a stator lamination having stator teeth; each stator tooth includes a first tooth edge and a second tooth edge, the first tooth edge and the second tooth edge being arranged at an angle to form a wedge-shaped stator groove structure with one end wider than the other between two adjacent stator teeth; the first width bt2 of the stator tooth satisfies the following formula: 1.5≤π*δp*L*W / (bt2*P*λ)≤3.6; where δp is the pole arc coefficient of the motor, L and W are the width and thickness of the permanent magnet, respectively, P is the number of pole pairs, and λ is the motor split ratio; the first width of the stator tooth bt2 is the width at the root of the stator tooth.

2. The stator assembly according to claim 1, characterized in that, The second width bt1 and the first width bt2 of the stator teeth satisfy the following formula: 2*bt1 / 3≤bt2≤5*bt1 / 6.

3. The stator assembly according to claim 1, characterized in that, The stator tooth includes a stator tooth shoe; the tip of the stator tooth shoe is provided with a chopped edge; the thickness a2 of the chopped edge and the thickness a1 of the stator tooth shoe satisfy the following relationship: 0.5≤a2 / a1≤0.

85.

4. The stator assembly according to claim 3, characterized in that, The stator tooth width b1 and the cut edge width b2 satisfy the following relationship: 0.75≤b2 / b1≤0.

9.

5. The stator assembly according to claim 1, characterized in that, The first tooth edge and / or the second tooth edge comprises two tooth segments connected end to end, namely the first tooth segment and the second tooth segment; the first tooth segment and the second tooth segment are connected by a transition arc; the radius R1 of the transition arc satisfies the following relationship: R1≤(Dd-eb)*tan(α / 2) / 6, where: α is the angle formed by the intersection of the first tooth segment and the second tooth segment, eb is the width of the stator yoke; D is the outer diameter of the stator lamination; d is the inner diameter of the stator lamination.

6. The stator assembly according to claim 1, characterized in that, The range of the pole arc coefficient δp of the motor is: 0.6≤δp≤0.85, where δp=a / b, a is the central angle corresponding to the upper end of the permanent magnet; b is the angle corresponding to each pole.

7. The stator assembly according to claim 1, characterized in that, The stator breakage ratio range is 0.48≤λ≤0.66, where λ=d / D, d is the inner diameter of the stator lamination, and D is the outer diameter of the stator lamination.

8. An electric motor, characterized in that, It includes a rotor assembly and a stator assembly as described in any one of claims 1-7.

9. The motor according to claim 8, characterized in that, The number of pole pairs of the motor is P≥2.

10. A compressor, characterized in that, Includes the motor as described in claim 9.

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