Stator structure and single-phase induction motor

Abstract

The utility model provides a stator structure and a single-phase induction motor. The stator structure comprises a stator iron core, the stator iron core comprises at least two iron core units, stator tooth parts and yoke parts of the at least two iron core units are the same, the circumferential lengths of stator tooth boots are different, the at least two iron core units are sequentially arranged in the axial direction of the stator iron core to form a first iron core block and a second iron core block, and the first iron core block and the second iron core block are arranged in the same axial direction. The arrangement sequences of the iron core units of the first iron core blocks and the second iron core blocks are different, the first iron core blocks and the second iron core blocks are alternately arranged in the circumferential direction of the stator iron core, and inclined notches are formed in the stator notches formed by the stator tooth boots between the adjacent first iron core blocks and second iron core blocks. And segment differences are formed among different types of iron core units of the same iron core block along the axial direction. According to the stator structure, the influence of tooth harmonic waves can be weakened, so that the additional torque of the motor is reduced, the starting capability of the motor is effectively improved, and the vibration noise is low.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a stator structure and a single-phase induction motor. Background Art

[0002] The single-phase induction motor with single-phase concentrated winding has high winding utilization, less tooth slots, short winding time and low process cost. However, the low-order harmonics of concentrated winding are large, which will cause low-order electromagnetic force in the motor and easily lead to vibration and noise problems; concentrated winding single-phase induction motor has a variety of complex harmonic components, which often have obvious asynchronous additional torque, resulting in poor starting characteristics, which greatly affects the efficiency and output capacity of the motor.

[0003] The related art discloses a stator structure for a single-phase induction motor, including a stator provided with stator teeth, each stator tooth having a concentrated winding wound thereon, the arc surface of the stator tooth facing the motor air gap being composed of three tangent arcs, the center of the middle arc of the stator tooth being concentric with the center of the motor air gap, and the centers of the two end arcs of the stator tooth being not concentric with the center of the motor air gap.

[0004] This motor can only slightly increase the torque of the motor in the low speed range, and has a weak effect on improving the starting ability of the motor. Utility Model Content

[0005] The main purpose of the utility model is to provide a stator structure and a single-phase induction motor, which can reduce the amplitude of the main tooth harmonics and reduce the additional torque, effectively improve the starting ability of the motor and reduce vibration and noise.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a stator structure is provided, including a stator core, the stator core including at least two core units, the stator teeth and yokes of at least two core units are the same, the circumferential lengths of the stator tooth shoes are different, the at least two core units are arranged in sequence along the axial direction of the stator core to form a first core block and a second core block, along the same axial direction, the arrangement order of the core units of the first core block and the second core block is different, the first core block and the second core block are alternately arranged along the circumference of the stator core, an oblique slot is formed between adjacent first core blocks and second core blocks at the position of the stator slot formed by the stator tooth shoes, and a step difference is formed along the axial direction between different types of core units of the same core block.

[0007] Furthermore, the angle of the inclined slot opening is θ, 1°≤θ≤3°.

[0008] Furthermore, in a cross section perpendicular to the central axis of the stator core, an angle formed by a line connecting the end points of the stator tooth shoe at both circumferential ends and the central axis of the stator core is α, 0.85*360° / Z1≤α≤360° / Z1, where Z1 is the number of stator teeth.

[0009] Furthermore, in a cross section perpendicular to the central axis of the stator core, the side of the stator tooth shoe close to the central axis of the stator core includes a tooth shoe arc segment located in the middle and cut edges located at both ends, and the angle between the two ends of the tooth shoe arc segment and the line connecting the central axis of the stator core is α1, and the angle formed by the endpoints at the two circumferential ends of the stator tooth shoe and the line connecting the central axis of the stator core is α, 0.7*α≤α1≤0.95*α.

[0010] Furthermore, in a cross section perpendicular to the central axis of the stator core, the side of the stator tooth shoe close to the central axis of the stator core includes a tooth shoe arc segment located in the middle and cut edges located at both ends, the distance between the two ends of the tooth shoe arc segment is H2, and the maximum distance between the end points of the stator tooth shoe at both circumferential ends is H1, 0.6*H1≤H2

[0011] Furthermore, in a cross section perpendicular to the central axis of the stator core, the side of the stator tooth shoe close to the central axis of the stator core includes a tooth shoe arc segment located in the middle and cut edges located at both ends, the maximum width of the stator slot formed between the adjacent first core blocks and the second core blocks is H3, and the distance between the endpoints of two adjacent cut edges on the adjacent first core blocks and the second core blocks at one end away from the stator slot is H4, 1.5*H3≤H4≤3*H3.

[0012] Furthermore, 2*H3≤H4≤2.5*H3.

[0013] Furthermore, in a cross section perpendicular to the central axis of the stator core, the side of the stator tooth shoe close to the central axis of the stator core includes a tooth shoe arc segment located in the middle and cut edges located at both ends, the maximum depth of the cut edges along the radial direction of the stator core is L2, the minimum depth of the stator slot along the radial direction of the stator core is L1, and 0.3*L1≤L2≤0.6*L1.

[0014] Furthermore, in a cross section perpendicular to the central axis of the stator core, an angle formed between a hypotenuse of the stator tooth shoe on a side away from the central axis of the stator core and a side of an adjacent stator tooth portion is α2, and 100°≤α2≤130°.

[0015] Furthermore, 110°≤α2≤120°.

[0016] ​Further, in a cross section perpendicular to the central axis of the stator core, the maximum distance between the end points of the stator tooth shoe at both ends in the circumferential direction is H1, the width of the stator tooth portion is H6, and 0.3*H1≤H6≤0.5*H1.

[0017] Furthermore, the width of the stator teeth is H6, the width of the yoke is H7, and H7≤H6≤1.5*H7.

[0018] Furthermore, the axial stacking heights of the core units forming the first core block and the second core block are the same.

[0019] Furthermore, in the same axial direction, the core units forming the first core block are arranged axially in an increasing manner according to the circumferential length of the stator tooth shoe, and the core units forming the second core block are arranged axially in a decreasing manner according to the circumferential length of the stator tooth shoe.

[0020] Furthermore, the core unit includes a first unit and a second unit. In the same axial direction, the arrangement direction of the core units in the first core block is the first unit and the second unit, and the arrangement direction of the core units in the second core block is the second unit and the first unit, wherein the circumferential length of the stator tooth shoe of the first unit is greater than the circumferential length of the stator tooth shoe of the second unit.

[0021] Furthermore, the core unit includes a first unit, a second unit and a third unit. In the same axial direction, the arrangement direction of the core units in the first core block is the first unit, the second unit and the third unit respectively, and the arrangement direction of the core units in the second core block is the third unit, the second unit and the first unit respectively, wherein the circumferential length of the stator tooth shoe of the first unit is greater than the circumferential length of the stator tooth shoe of the second unit, and the circumferential length of the stator tooth shoe of the second unit is greater than the circumferential length of the stator tooth shoe of the third unit.

[0022] Furthermore, the core unit includes a first unit, a second unit and a third unit. In the same axial direction, the arrangement direction of the core units in the first core block is the first unit, the second unit and the first unit, and the arrangement direction of the core units in the second core block is the third unit, the second unit and the third unit, wherein the circumferential length of the stator tooth shoe of the first unit is greater than the circumferential length of the stator tooth shoe of the second unit, and the circumferential length of the stator tooth shoe of the second unit is greater than the circumferential length of the stator tooth shoe of the third unit.

[0023] Furthermore, in adjacent first core blocks and second core blocks, the width of the stator slot formed between the first unit and the third unit located at the same axial height is equal to the width of the stator slot formed between adjacent second units.

[0024] Furthermore, the stator teeth are respectively wound with a main phase winding and an auxiliary phase winding, which are alternately wound in sequence. The main phase winding and the auxiliary phase winding have different winding directions, and the relationship between the number of turns N1 of the main phase winding and the number of turns N2 of the auxiliary phase winding satisfies 0.85*N1≤N2≤0.95*N1.

[0025] According to another aspect of the present invention, a single-phase induction motor is provided. The single-phase induction motor adopts concentrated winding. The single-phase induction motor comprises a stator structure and a rotor structure. The stator structure is sleeved outside the rotor structure. The stator structure is the above-mentioned stator structure.

[0026] Further, when the maximum width of the stator slot formed between the adjacent first core blocks and the second core blocks is H3, the rotor structure includes a rotor core, a conductor slot is arranged on the rotor core, and a rotor slot is opened on the radial outside of the conductor slot. The width of the rotor slot is H5, 2*H5≤H3≤3*H5.

[0027] Furthermore, the rotor structure includes a rotor core, the rotor core is provided with conductor slots, the conductor slots are filled with conductive non-magnetic material, a rotor tooth shoe is provided on the radial outer side of the rotor core, a rotor slot is formed between adjacent rotor tooth shoes, and in a cross section perpendicular to the central axis of the rotor core, the maximum angle formed by the end points of the rotor tooth shoe at both circumferential ends and the line connecting the central axis of the rotor core is α3, and the angle formed by the end points of the stator tooth shoe at both circumferential ends and the line connecting the central axis of the stator core is α, 0.3*α≤α3≤0.5*α.

[0028] Furthermore, the rotor structure includes a rotor core, on which conductor slots are arranged. In a cross section perpendicular to the central axis of the rotor core, there are multiple conductor slots, which are evenly spaced along the circumference of the rotor core. The circumferential width of the conductor slots decreases along the direction approaching the axial hole, and the small head end of the conductor slots points to the axial hole.

[0029] Furthermore, in a cross section perpendicular to the central axis of the rotor core, the rotor core is provided with a rotor slot on the radial outside of the conductor slot, the rotor slot passes through the outer circle of the rotor from the end of the conductor slot away from the shaft hole, the diameter of the circle where the radial inner end of the rotor slot is located is D2, the diameter of the circle where the radial outer end of the rotor slot is located is D1, and 0.965*D1≤D2<D1.

[0030] Furthermore, in a cross section perpendicular to the central axis of the rotor core, the rotor core is provided with a rotor slot on the radial outside of the conductor slot, and the rotor slot passes through the outer circle of the rotor from the end of the conductor slot away from the shaft hole. The diameter of the circle where the radial outer end of the rotor slot is located is D1, and the diameter of the circle where the radial inner end of the conductor slot is located is D3, and 0.45*D1≤D3≤0.6D1.

[0031] Furthermore, in a cross section perpendicular to the central axis of the rotor core, the conductor slot includes a first arc segment located radially outside, a second arc segment located radially inside, and a straight line segment connected between the first arc segment and the second arc segment, the radius of the first arc segment is R1, the total radial length of the conductor slot is L3, 0.15*L3≤R1≤0.25*L3.

[0032] Furthermore, in a cross section perpendicular to the central axis of the rotor core, the conductor slot includes a first arc segment located radially outside, a second arc segment located radially inside, and a straight line segment connected between the first arc segment and the second arc segment, the radius of the first arc segment is R1, the radius of the second arc segment is R2, and 2*R2≤R1≤3*R2.

[0033] Furthermore, in a cross section perpendicular to the central axis of the rotor core, the conductor slot includes a first arc segment located radially outside, a second arc segment located radially inside, and a straight line segment connected between the first arc segment and the second arc segment, and the conductor slot is symmetrical about the axis of symmetry formed by a center line connecting the first arc segment and the second arc segment, and an angle between the straight line segment and the axis of symmetry is α4, 0.4*360° / Z2≤α4≤0.6*360° / Z2, and Z2 is the number of conductor slots on the rotor core.

[0034] Furthermore, in a cross section perpendicular to the central axis of the rotor core, the rotor core is provided with a rotor slot on the radial outside of the conductor slot, the conductor slot includes a first arc segment located radially outside, a second arc segment located radially inside, and a straight line segment connected between the first arc segment and the second arc segment, the width of the rotor slot is H5, the radius of the first arc segment is R1, 0.2*R1≤H5≤0.5R1.

[0035] Furthermore, the rotor structure includes a rotor core, on which conductor slots are arranged, rotor teeth and rotor tooth shoes are formed between adjacent conductor slots, the conductor slots are filled with conductive non-magnetic material, the rotor tooth shoes are located radially outside the rotor teeth, and rotor notches are formed between adjacent rotor tooth shoes. In a cross section perpendicular to the central axis of the rotor core, the minimum width of the rotor teeth is H8, the maximum width of the rotor tooth shoes is H9, and 0.25*H9≤H8≤0.5*H9.

[0036] The technical solution of the utility model is applied, and the stator structure includes a stator core, and the stator core includes at least two core units, the stator teeth and yokes of the at least two core units are the same, the circumferential lengths of the stator tooth shoes are different, and the at least two core units are arranged in sequence along the axial direction of the stator core to form a first core block and a second core block. Along the same axial direction, the arrangement order of the core units of the first core block and the second core block is different, the first core block and the second core block are alternately arranged along the circumference of the stator core, and a stator slot formed at the stator tooth shoe is formed between adjacent first core blocks and second core blocks. The stator core of the stator structure adopts a block structure, and the minimum structure of the stator core is a core unit with different circumferential lengths of the stator tooth shoes and the same stator tooth part and yoke part. Since the circumferential lengths of the stator tooth shoes of the core units are different, the stator slot of the stator core formed by the combination of the core units is a skewed slot structure. The stator slot adopts a skewed slot structure to reduce the amplitude of the main tooth harmonics, disperse the tooth harmonics, reduce the additional torque, improve the starting ability, and reduce the vibration noise peak of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0038] Figure 1 A schematic structural diagram of a stator structure of an embodiment of the utility model is shown;

[0039] Figure 2 A schematic structural diagram of an iron core unit of a stator structure of an embodiment of the utility model is shown;

[0040] Figure 3 A schematic diagram showing the structure of a single-phase induction motor according to an embodiment of the utility model is shown;

[0041] Figure 4 A schematic structural diagram of a stator structure of an embodiment of the utility model at a first axial height is shown;

[0042] Figure 5 A schematic structural diagram of a stator structure at a third axial height of an embodiment of the utility model is shown;

[0043] Figure 6 A schematic structural diagram of a stator structure of an embodiment of the utility model at a second axial height is shown;

[0044] Figure 7 A schematic structural diagram of a rotor structure of an embodiment of the utility model is shown;

[0045] Figure 8 A three-dimensional structural diagram of a stator structure of an embodiment of the utility model is shown;

[0046] Fig. 9 A three-dimensional structural diagram of a stator structure of an embodiment of the utility model is shown;

[0047] Fig.10 A three-dimensional structural diagram of a stator structure of an embodiment of the utility model is shown;

[0048] Fig.11 A curve diagram showing the relationship between θ and the amplitude of the third tooth harmonic of a single-phase induction motor according to an embodiment of the utility model is shown;

[0049] Fig.12 A curve diagram showing the relationship between H3 / H5 and additional torque of a single-phase induction motor according to an embodiment of the utility model is shown;

[0050] Fig.13 A curve diagram showing the relationship between α3 / α and torque ripple of a single-phase induction motor according to an embodiment of the utility model;

[0051] Fig.14 A comparison diagram of electromagnetic force harmonic amplitudes of a single-phase induction motor according to an embodiment of the utility model and a single-phase induction motor according to a related art is shown;

[0052] Fig.15 A comparison diagram showing the speed-torque relationship between the single-phase induction motor of the embodiment of the utility model and the single-phase induction motor of the related art; and

[0053] Fig.16 A torque curve comparison diagram of the single-phase induction motor of the embodiment of the utility model and the single-phase induction motor of the related art is shown.

[0054] The above drawings include the following reference numerals:

[0055] 1. stator core; 11. core unit; 111. first unit; 112. second unit; 113. third unit; 12. first core block; 13. second core block; 14. yoke; 15. stator slot; 16. positioning protrusion; 17. positioning groove; 2. rotor core; 21. rotor slot; 22. rotor tooth; 3. stator tooth shoe; 31. bevel edge; 32. cut edge; 33. tooth shoe arc segment; 4. stator tooth; 5. rotor punching; 6. conductor slot; 61. first arc segment; 62. second arc segment; 63. straight line segment; 7. rotor tooth shoe. DETAILED DESCRIPTION

[0056] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0057] See also Figures 1 to 16 As shown, according to an embodiment of the utility model, the stator structure includes a stator core 1, and the stator core 1 includes at least two core units 11. The stator teeth 4 and the yokes 14 of at least two core units 11 are the same, and the circumferential lengths of the stator tooth shoes 3 are different. At least two core units 11 are arranged in sequence along the axial direction of the stator core 1 to form a first core block 12 and a second core block 13. Along the same axial direction, the arrangement order of the core units of the first core block 12 and the second core block 13 is different. The first core block 12 and the second core block 13 are alternately arranged along the circumference of the stator core 1, and an oblique slot is formed between adjacent first core blocks 12 and second core blocks 13 at the position of the stator slot 15 formed by the stator tooth shoes 3, and a step difference is formed along the axial direction between different types of core units 11 of the same core block.

[0058] The stator core 1 of the stator structure adopts a block structure, and the minimum structure constituting the stator core 1 is a core unit 11 with different circumferential lengths of the stator tooth shoes 3 and the same stator tooth part 4 and yoke part 14. Since the circumferential lengths of the stator tooth shoes 3 of the core units 11 are different, the stator slots 15 of the stator core 1 formed by the combination of the core units 11 are skewed slot structures. The stator slots 15 adopt a skewed slot structure to reduce the amplitude of the main tooth harmonics, disperse the tooth harmonics, reduce the additional torque, improve the starting ability, and reduce the vibration noise peak of the motor.

[0059] In the present embodiment, along the same axial direction, the arrangement order of the core units of the first core block 12 and the second core block 13 is different, which means that along a certain axial direction of the central axis of the stator core 1, the arrangement order of the core units 11 constituting the first core block 12 is different from the arrangement order of the core units 11 constituting the second core block 13. This difference can be that the number and type of the core units 11 constituting the first core block 12 and the core units 11 constituting the second core block 13 are the same, and only the arrangement order in the same axial direction is different. It can also be that the number of the core units 11 constituting the first core block 12 and the core units 11 constituting the second core block 13 are the same, but the types are different, so the arrangement order in the same axial direction is different. The difference in arrangement order is distinguished from the overall structure. The types of the core units 11 at the same axial height can be the same, and it is only necessary to ensure that the arrangement order of the core blocks formed as a whole is not completely the same.

[0060] In one embodiment, the angle of the inclined slot opening is θ, and 1°≤θ≤3°.

[0061] In this embodiment, the skew angle of the stator slot 15 refers to the deflection angle between two groups of core units 11 adjacent to each other in the axial direction. By limiting the skew angle, the amplitude of the main tooth harmonics can be reduced, the tooth harmonics can be dispersed, the additional torque can be reduced, the starting ability can be improved, and the main vibration noise peak can be reduced.

[0062] See also Fig.11 As shown, it is a curve diagram of the relationship between the skew slot angle θ and the third tooth harmonic amplitude of the stator structure of the utility model. Under the same working condition, when the skew slot angle θ of the stator slot 15 of the stator core 1 satisfies 1°≤θ≤3°, the third tooth harmonic amplitude of the single-phase induction motor is at a lower level, which can weaken the tooth harmonic amplitude and reduce the vibration noise of the motor.

[0063] In one embodiment, in a cross section perpendicular to the central axis of the stator core 1, an angle formed by a line connecting the end points at both circumferential ends of the stator tooth shoe 3 and the central axis of the stator core 1 is α, 0.85*360° / Z1≤α≤360° / Z1, where Z1 is the number of stator teeth.

[0064] By limiting the angle range of the stator tooth shoe 3, the stator magnetic circuit can be ensured to be unobstructed, magnetic leakage can be reduced, and the motor output can be increased, thereby improving the motor efficiency.

[0065] In one embodiment, in a cross section perpendicular to the central axis of the stator core 1, the side of the stator tooth shoe 3 close to the central axis of the stator core 1 includes a tooth shoe circular arc segment 33 located in the middle and cut edges 32 located at both ends, the angle between the two ends of the tooth shoe circular arc segment 33 and the line connecting the central axis of the stator core 1 is α1, the angle formed by the endpoints at the two circumferential ends of the stator tooth shoe 3 and the line connecting the central axis of the stator core 1 is α, 0.7*α≤α1≤0.95*α.

[0066] In this embodiment, cutting edges 32 are set at both ends of the stator tooth shoe 3, and the setting position of the cutting edge 32 is limited by the angle range of the tooth shoe arc segment 33. The cutting edge 32 can be used to change the positional relationship between the rotor magnetic channel and the stator tooth slot, effectively reducing the tooth slot effect and reducing current harmonics.

[0067] In one embodiment, in a cross section perpendicular to the central axis of the stator core 1, the side of the stator tooth shoe 3 close to the central axis of the stator core 1 includes a tooth shoe arc segment 33 located in the middle and cut edges 32 located at both ends, the distance between the two ends of the tooth shoe arc segment 33 is H2, the maximum distance between the end points of the stator tooth shoe 3 at both ends in the circumferential direction is H1, 0.6*H1≤H2

[0068] ​Limiting the width of the stator tooth shoe 3 can, on the one hand, change the magnetic circuit of the stator tooth shoe part and reduce magnetic leakage, and on the other hand, ensure the mechanical strength of the stator tooth shoe part and prevent the stator tooth shoe part from being deformed.

[0069] In one embodiment, in a cross section perpendicular to the central axis of the stator core 1, the side of the stator tooth shoe 3 close to the central axis of the stator core 1 includes a tooth shoe arc segment 33 located in the middle and cut edges 32 located at both ends, the maximum width of the stator slot 15 formed between the adjacent first core blocks 12 and the second core blocks 13 is H3, and the distance between the endpoints of the two adjacent cut edges 32 on the adjacent first core blocks 12 and the second core blocks 13 at the end away from the stator slot 15 is H4, 1.5*H3≤H4≤3*H3.

[0070] In one embodiment, 2*H3≤H4≤2.5*H3.

[0071] Limiting the maximum width between the cut edges 32 of adjacent stator tooth shoes 3 can increase the tooth harmonic order, reduce the tooth harmonic amplitude, improve the motor starting torque concave problem, and enhance the motor starting capability.

[0072] In one embodiment, in a cross section perpendicular to the central axis of the stator core 1, the side of the stator tooth shoe 3 close to the central axis of the stator core 1 includes a tooth shoe arc segment 33 located in the middle and cut edges 32 located at both ends, the maximum depth of the cut edges 32 along the radial direction of the stator core 1 is L2, the minimum depth of the stator slot 15 along the radial direction of the stator core 1 is L1, 0.3*L1≤L2≤0.6*L1.

[0073] By defining the relationship between the radial depth of the cutting edge 32 and the radial depth of the stator slot 15 , it is possible to prevent the stator tooth shoe from being deformed while ensuring that the stator magnetic circuit is unobstructed.

[0074] In one embodiment, in a cross section perpendicular to the central axis of the stator core 1, an angle formed between a bevel 31 of the stator tooth shoe 3 on a side away from the central axis of the stator core 1 and a side of an adjacent stator tooth portion 4 is α2, and 100°≤α2≤130°.

[0075] In one embodiment, 110°≤α2≤120°.

[0076] Through the above limitations, a certain stator slot area can be guaranteed, which not only provides a reasonable layout space for the main and auxiliary phase windings, weakens harmonics, reduces motor vibration noise, but also retains a reasonable stator magnetic circuit for magnetic flux to avoid stator magnetic field saturation.

[0077] In one embodiment, in a cross section perpendicular to the central axis of the stator core 1 , the maximum distance between the end points of the stator tooth shoe 3 at both circumferential ends is H1, the width of the stator tooth portion 4 is H6, and 0.3*H1≤H6≤0.5*H1.

[0078] By limiting the size relationship between the stator tooth shoe 3 and the stator tooth portion 4, the magnetic lines of force can easily enter the stator core 1, and the magnetic circuit of the stator core 1 is not easily saturated.

[0079] In one embodiment, the width of the stator tooth portion 4 is H6, the width of the yoke portion 14 is H7, and H7≤H6≤1.5*H7.

[0080] By limiting the relationship between the width of the stator teeth and the width of the yoke, the stator space can be reasonably utilized to ensure smooth flow of the stator magnetic flux while avoiding magnetic field saturation.

[0081] In one embodiment, the axial stacking heights of the core units 11 forming the first core block 12 and the second core block 13 are the same, which makes it easier to form each core block and facilitates the assembly of the core blocks.

[0082] In one embodiment, in the same axial direction, the core units 11 forming the first core block 12 are arranged axially in an increasing manner according to the circumferential length of the stator tooth shoe 3, and the core units 11 forming the second core block 13 are arranged axially in a decreasing manner according to the circumferential length of the stator tooth shoe 3.

[0083] In this embodiment, by making the arrangement order of the core units 11 of the first core block 12 and the second core block 13 in the axial direction opposite, it is possible to ensure that the skew directions of the stator slots 15 between the first core block 12 and the second core block 13 are consistent, thereby more effectively weakening the tooth harmonic amplitude and reducing the vibration noise of the motor.

[0084] See also Fig. 9 As shown, in one embodiment, the core unit 11 includes a first unit 111 and a second unit 112. In the same axial direction, the arrangement direction of the core units 11 in the first core block 12 is the first unit 111 and the second unit 112, and the arrangement direction of the core units 11 in the second core block 13 is the second unit 112 and the first unit 111, wherein the circumferential length of the stator tooth shoe 3 of the first unit 111 is greater than the circumferential length of the stator tooth shoe 3 of the second unit 112.

[0085] See also Figure 8As shown, in one embodiment, the core unit 11 includes a first unit 111, a second unit 112 and a third unit 113. In the same axial direction, the arrangement direction of the core units 11 in the first core block 12 is the first unit 111, the second unit 112 and the third unit 113, and the arrangement direction of the core units 11 in the second core block 13 is the third unit 113, the second unit 112 and the first unit 111, wherein the circumferential length of the stator tooth shoe 3 of the first unit 111 is greater than the circumferential length of the stator tooth shoe 3 of the second unit 112, and the circumferential length of the stator tooth shoe 3 of the second unit 112 is greater than the circumferential length of the stator tooth shoe 3 of the third unit 113.

[0086] See also Fig.10 As shown, in one embodiment, the core unit 11 includes a first unit 111, a second unit 112 and a third unit 113. In the same axial direction, the arrangement direction of the core units 11 in the first core block 12 is the first unit 111, the second unit 112 and the first unit 111, respectively, and the arrangement direction of the core units 11 in the second core block 13 is the third unit 113, the second unit 112 and the third unit 113, respectively, wherein the circumferential length of the stator tooth shoe 3 of the first unit 111 is greater than the circumferential length of the stator tooth shoe 3 of the second unit 112, and the circumferential length of the stator tooth shoe 3 of the second unit 112 is greater than the circumferential length of the stator tooth shoe 3 of the third unit 113.

[0087] In one embodiment, the stator core 1 adopts a block structure, and the minimum structure constituting the stator core 1 is a plurality of core units 11 with different circumferential lengths of stator tooth shoes and the same stator tooth parts and yoke parts. The first core block 12 and the second core block 13 formed by the combination of the plurality of core units 11 are both provided with a positioning protrusion 16 at one end in the circumferential direction and a positioning groove 17 at the other end in the circumferential direction. In this way, the winding can be firstly wound on the core block formed by the combination of the core units 11, and then the adjacent combined core blocks can be combined and installed by means of the protrusion and groove clamping. Since the circumferential lengths of the stator tooth shoes of different core units 11 are different, the stator slot 15 between the first core block 12 and the second core block 13 formed by the combination of different core units 11 forms a skewed slot structure.

[0088] In one embodiment, the positioning protrusion 16 is a circular arc protrusion, and the positioning groove 17 is a circular arc groove.

[0089] In one embodiment, in adjacent first core blocks 12 and second core blocks 13 , the width of the stator slot 15 formed between the first unit 111 and the third unit 113 located at the same axial height is equal to the width of the stator slot 15 formed between adjacent second units 112 .

[0090] Such an arrangement can form a skewed slot structure in the stator slot 15 while preventing the width of the stator slot 15 from being too large or too small to affect the magnetic field distribution of the stator.

[0091] In one embodiment, the stator teeth 4 are respectively wound with a main phase winding and an auxiliary phase winding, the main phase winding and the auxiliary phase winding are alternately wound in sequence, the main phase winding and the auxiliary phase winding have different winding directions, and the relationship between the number of turns N1 of the main phase winding and the number of turns N2 of the auxiliary phase winding satisfies 0.85*N1≤N2≤0.95*N1.

[0092] By setting a reasonable number of main and auxiliary phase turns, tooth harmonics can be weakened, noise and harmonic losses can be reduced, and motor efficiency can be improved.

[0093] See also Figures 1 to 16 As shown, according to an embodiment of the present utility model, the single-phase induction motor adopts concentrated winding, and the single-phase induction motor includes a stator structure and a rotor structure, the stator structure is sleeved outside the rotor structure, and the stator structure is the above-mentioned stator structure.

[0094] In one embodiment, when the maximum width of the stator slot 15 formed between the adjacent first core blocks 12 and the second core blocks 13 is H3, the rotor structure includes a rotor core 2, on which a conductor slot 6 is provided, and the rotor core 2 is provided with a rotor slot 21 on the radial outside of the conductor slot 6, and the width of the rotor slot 21 is H5, 2*H5≤H3≤3*H5.

[0095] By limiting the relationship between the width of the stator slot 15 and the width of the rotor slot 21 , the tooth harmonic order can be increased, the tooth harmonic amplitude can be reduced, the asynchronous additional torque can be weakened, and the starting ability of the motor can be improved.

[0096] See also Fig.12 As shown, it is a relationship curve diagram of the ratio H3 / H5 of the width of the stator slot 15 to the width of the rotor slot 21 of the single-phase induction motor according to the embodiment of the utility model and the additional torque. Under the same working condition, when the maximum width H3 of the stator slot 15 formed by the sides of two adjacent tooth shoes and the width H5 of the rotor slot 21 satisfy 2*H5≤H3≤3*H5, the additional torque of the single-phase induction motor is at a relatively low level, and the additional torque value increases slowly, which can reduce the additional torque of the single-phase induction motor and make the motor easier to start.

[0097] In one embodiment, the rotor structure includes a rotor core 2, on which a conductor slot 6 is provided, in which a conductive non-magnetic material is filled, a rotor tooth shoe 7 is provided on the radial outer side of the rotor core 2, and a rotor slot 21 is formed between adjacent rotor tooth shoes 7. In a cross section perpendicular to the central axis of the rotor core 2, the maximum angle formed by the end points at both circumferential ends of the rotor tooth shoe 7 and the line connecting the central axis of the rotor core 2 is α3, and the angle formed by the end points at both circumferential ends of the stator tooth shoe 3 and the line connecting the central axis of the stator core 1 is α, 0.3*α≤α3≤0.5*α.

[0098] Limiting the relationship between the angle ranges of the stator and rotor tooth boots can ensure that the stator and rotor magnetic circuits are unobstructed, allowing the magnetic flux to flow more smoothly, reducing leakage flux, increasing motor output, and thus improving motor efficiency.

[0099] See also Fig.13 As shown, it is a relationship curve diagram of the ratio α3 / α between the stator tooth shoe angle range and the rotor tooth shoe angle range and the torque pulsation of an embodiment of the utility model. Under the same working condition, when the angle α formed by the line connecting the two end points of the same stator tooth shoe and the central axis and the maximum angle α3 formed by the line connecting the two end points of the same rotor tooth shoe and the central axis satisfy 0.3*α≤α3≤0.5*α, the torque pulsation value of the single-phase induction motor is small, which can reduce the torque pulsation, reduce the main vibration peak value, and reduce the motor noise.

[0100] The conductive but non-magnetic material is, for example, aluminum, copper, etc.

[0101] In one embodiment, the rotor structure includes a rotor core 2, on which conductor slots 6 are arranged. In a cross section perpendicular to the central axis of the rotor core 2, there are multiple conductor slots 6, which are evenly spaced along the circumference of the rotor core 2. The circumferential width of the conductor slots 6 decreases along the direction approaching the axial hole, and the small head end of the conductor slot 6 points to the axial hole.

[0102] Through the above arrangement, the normal starting and operation of the rotor and the mechanical strength of the rotor can be guaranteed; the conductor in the conductor slot 6 helps the motor to start and run, and the circumferential width of the conductor slot 6 decreases along the direction close to the shaft hole, and the small head end of the conductor slot 6 points to the shaft hole, so that the shape change of the conductor slot 6 is adapted to the spatial change of the rotor core 2. The conductor slots 6 are evenly distributed, which can reduce the influence of the conductor slots 6 on the magnetic circuit and ensure the output of the motor.

[0103] In one embodiment, in a cross section perpendicular to the central axis of the rotor core 2, the rotor core 2 is provided with a rotor slot 21 on the radial outer side of the conductor slot 6, and the rotor slot 21 penetrates the outer circle of the rotor from the end of the conductor slot 6 away from the shaft hole, the diameter of the circle where the radial inner end of the rotor slot 21 is located is D2, the diameter of the circle where the radial outer end of the rotor slot 21 is located is D1, and 0.965*D1≤D2<D1.

[0104] This arrangement can ensure a certain rotor slot depth, weaken the rotor tooth harmonics while ensuring the mechanical strength of the rotor.

[0105] In one embodiment, in a cross section perpendicular to the central axis of the rotor core 2, the rotor core 2 is provided with a rotor slot 21 on the radial outer side of the conductor slot 6, and the rotor slot 21 penetrates the outer circle of the rotor from the end of the conductor slot 6 away from the shaft hole. The diameter of the circle where the radial outer end of the rotor slot 21 is located is D1, and the diameter of the circle where the radial inner end of the conductor slot 6 is located is D3, and 0.45*D1≤D3≤0.6D1.

[0106] Such an arrangement can fully utilize the rotor space, fill the conductor slot 6 with sufficient conductive and non-magnetic material, and improve the starting ability of the motor.

[0107] In one embodiment, in a cross section perpendicular to the central axis of the rotor core 2, the conductor slot 6 includes a first arc segment 61 located radially outside, a second arc segment 62 located radially inside, and a straight line segment 63 connected between the first arc segment 61 and the second arc segment 62, the radius of the first arc segment 61 is R1, the total radial length of the conductor slot 6 is L3, and 0.15*L3≤R1≤0.25*L3.

[0108] This arrangement can fully utilize the rotor space to arrange the conductor slot 6, improve the motor starting ability, and at the same time ensure the rotor magnetic field magnetic circuit, thereby improving the motor output capacity.

[0109] In one embodiment, in a cross section perpendicular to the central axis of the rotor core 2, the conductor slot 6 includes a first arc segment 61 located radially outside, a second arc segment 62 located radially inside, and a straight line segment 63 connected between the first arc segment 61 and the second arc segment 62, the radius of the first arc segment 61 is R1, the radius of the second arc segment 62 is R2, and 2*R2≤R1≤3*R2.

[0110] Such an arrangement can prevent the width of the magnetic conductive channel between the arcs at the bottom of the conductor slot 6 close to the outer circle of the rotor from being too large or too small, thereby affecting the saturation of the rotor magnetic circuit.

[0111] In one embodiment, in a cross section perpendicular to the central axis of the rotor core 2, the conductor slot 6 includes a first arc segment 61 located radially outward, a second arc segment 62 located radially inward, and a straight line segment 63 connected between the first arc segment 61 and the second arc segment 62, and the conductor slot 6 is symmetrical about the symmetry axis formed by the center line connecting the first arc segment 61 and the second arc segment 62, and the angle between the straight line segment 63 and the symmetry axis is α4, 0.4*360° / Z2≤α4≤0.6*360° / Z2, and Z2 is the number of conductor slots 6 on the rotor core 2.

[0112] This arrangement is to ensure that there is enough magnetic conductive width between the conductor slots 6 to avoid magnetic field saturation and affect the flow of magnetic flux in the channels between the conductor slots 6 .

[0113] In one embodiment, in a cross section perpendicular to the central axis of the rotor core 2, the rotor core 2 is provided with a rotor slot 21 on the radial outside of the conductor slot 6, the conductor slot 6 includes a first arc segment 61 located on the radial outside, a second arc segment 62 located on the radial inside, and a straight line segment 63 connected between the first arc segment 61 and the second arc segment 62, the width of the rotor slot 21 is H5, the radius of the first arc segment 61 is R1, 0.2*R1≤H5≤0.5R1.

[0114] This setting can limit the rotor slot width, increase the tooth harmonic order, reduce the tooth harmonic amplitude, weaken the asynchronous additional torque, and improve the starting ability of the single-phase induction motor.

[0115] In one embodiment, the rotor structure includes a rotor core 2, on which conductor slots 6 are provided, rotor teeth 22 and rotor tooth shoes 7 are formed between adjacent conductor slots 6, the conductor slots 6 are filled with conductive and non-magnetic material, the rotor tooth shoes 7 are located radially outward of the rotor teeth 22, and rotor slots 21 are formed between adjacent rotor tooth shoes 7. In a cross section perpendicular to the central axis of the rotor core 2, the minimum width of the rotor tooth 22 is H8, the maximum width of the rotor tooth shoe 7 is H9, and 0.25*H9≤H8≤0.5*H9.

[0116] This setting can ensure sufficient rotor magnetic circuit space, reduce rotor saturation and improve motor efficiency.

[0117] See also Figure 14 to Figure 16As shown, there is a comparison diagram of electromagnetic force harmonic amplitude, a speed-torque relationship comparison diagram and a torque curve comparison diagram of the single-phase induction motor of the embodiment of the utility model and the single-phase induction motor of the related art. Compared with the single-phase induction motor of the related art, the electromagnetic force harmonic amplitudes of each order of the single-phase induction motor of the embodiment of the utility model are reduced; the torque change in the low-speed stage is smoother, the asynchronous additional torque of the single-phase induction motor is improved, the starting ability is stronger, and the torque fluctuation is smaller, which can improve the motor harmonics and reduce the motor vibration noise.

[0118] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0119] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0120] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stator structure, characterized in that: The invention comprises a stator core (1), wherein the stator core (1) comprises at least two types of core units (11), the stator teeth (4) and yokes (14) of at least two types of the core units (11) are the same, the circumferential lengths of the stator tooth shoes (3) are different, the at least two types of the core units (11) are arranged in sequence along the axial direction of the stator core (1) to form a first core block (12) and a second core block (13), along the same axial direction, the arrangement order of the core units of the first core block (12) and the second core block (13) is different, the first core block (12) and the second core block (13) are arranged alternately along the circumference of the stator core (1), an oblique notch is formed between adjacent first core blocks (12) and second core blocks (13) at the position of the stator notch (15) formed in the stator tooth shoes (3), and a step difference is formed along the axial direction between the core units (11) of different types of the same core block.

2. The stator structure according to claim 1, characterized in that: The inclined groove angle of the inclined groove opening is θ, 1°≤θ≤3°.

3. The stator structure according to claim 1, characterized in that: In a cross section perpendicular to the central axis of the stator core (1), the angle formed by the line connecting the end points at both circumferential ends of the stator tooth shoe (3) and the central axis of the stator core (1) is α, 0.85*360° / Z1≤α≤360° / Z1, where Z1 is the number of stator teeth.

4. The stator structure according to claim 1, characterized in that: In a cross section perpendicular to the central axis of the stator core (1), the side of the stator tooth shoe (3) close to the central axis of the stator core (1) comprises a tooth shoe circular arc segment (33) located in the middle and cut edges (32) located at two ends, the angle between the two ends of the tooth shoe circular arc segment (33) and the line connecting the central axis of the stator core (1) is α1, the angle formed by the end points at the two circumferential ends of the stator tooth shoe (3) and the line connecting the central axis of the stator core (1) is α, and 0.7*α≤α1≤0.95*α.

5. The stator structure according to claim 1, characterized in that: In a cross section perpendicular to the central axis of the stator core (1), the side of the stator tooth shoe (3) close to the central axis of the stator core (1) includes a tooth shoe circular arc segment (33) located in the middle and cut edges (32) located at both ends, the distance between the two ends of the tooth shoe circular arc segment (33) is H2, the maximum distance between the end points of the stator tooth shoe (3) at both ends in the circumferential direction is H1, and 0.6*H1≤H2<H1.

6. The stator structure according to claim 1, characterized in that: In a cross section perpendicular to the central axis of the stator core (1), the side of the stator tooth shoe (3) close to the central axis of the stator core (1) includes a tooth shoe circular arc segment (33) located in the middle and cut edges (32) located at both ends, the maximum width of the stator slot (15) formed between the adjacent first core blocks (12) and the second core blocks (13) is H3, the distance between the endpoints of the two adjacent cut edges (32) on the adjacent first core blocks (12) and the second core blocks (13) at the end away from the stator slot (15) is H4, and 1.5*H3≤H4≤3*H3.

7. The stator structure according to claim 6, characterized in that: 2*H3≤H4≤2.5*H3.

8. The stator structure according to claim 1, characterized in that: In a cross section perpendicular to the central axis of the stator core (1), the side of the stator tooth shoe (3) close to the central axis of the stator core (1) comprises a tooth shoe circular arc segment (33) located in the middle and cut edges (32) located at both ends, the maximum depth of the cut edge (32) along the radial direction of the stator core (1) is L2, the minimum depth of the stator slot (15) along the radial direction of the stator core (1) is L1, and 0.3*L1≤L2≤0.6*L1.

9. The stator structure according to claim 1, characterized in that: In a cross section perpendicular to the central axis of the stator core (1), an angle formed between a hypotenuse (31) on a side of the stator tooth shoe (3) away from the central axis of the stator core (1) and a side of an adjacent stator tooth portion (4) is α2, and 100°≤α2≤130°.

10. The stator structure according to claim 9, characterized in that: 110°≤α2≤120°。 11. The stator structure according to claim 1, characterized in that: In a cross section perpendicular to the central axis of the stator core (1), the maximum distance between the end points of the stator tooth shoe (3) at both ends in the circumferential direction is H1, the width of the stator tooth portion (4) is H6, and 0.3*H1≤H6≤0.5*H1.

12. The stator structure according to claim 1, characterized in that: The width of the stator tooth portion (4) is H6, the width of the yoke portion (14) is H7, and H7≤H6≤1.5*H7.

13. The stator structure according to claim 1, characterized in that: The axial stacking heights of the core units (11) forming the first core block (12) and the second core block (13) are the same.

14. The stator structure according to claim 1, characterized in that: In the same axial direction, the core units (11) forming the first core block (12) are arranged in an axially increasing manner according to the circumferential length of the stator tooth shoe (3), and the core units (11) forming the second core block (13) are arranged in an axially decreasing manner according to the circumferential length of the stator tooth shoe (3).

15. The stator structure according to claim 14, characterized in that: The core unit (11) comprises a first unit (111) and a second unit (112); in the same axial direction, the arrangement direction of the core unit (11) in the first core block (12) is the first unit (111) and the second unit (112) in sequence; the arrangement direction of the core unit (11) in the second core block (13) is the second unit (112) and the first unit (111) in sequence; wherein the circumferential length of the stator tooth shoe (3) of the first unit (111) is greater than the circumferential length of the stator tooth shoe (3) of the second unit (112).

16. The stator structure according to claim 14, characterized in that: The core unit (11) comprises a first unit (111), a second unit (112) and a third unit (113); in the same axial direction, the arrangement direction of the core units (11) in the first core block (12) is the first unit (111), the second unit (112) and the third unit (113) in sequence; the arrangement direction of the core units (11) in the second core block (13) is the third unit (113), the second unit (112) and the first unit (111) in sequence; wherein the circumferential length of the stator tooth shoe (3) of the first unit (111) is greater than the circumferential length of the stator tooth shoe (3) of the second unit (112); and the circumferential length of the stator tooth shoe (3) of the second unit (112) is greater than the circumferential length of the stator tooth shoe (3) of the third unit (113).

17. The stator structure according to claim 1, characterized in that: The core unit (11) comprises a first unit (111), a second unit (112) and a third unit (113); in the same axial direction, the arrangement direction of the core units (11) in the first core block (12) is the first unit (111), the second unit (112) and the first unit (111) in sequence; the arrangement direction of the core units (11) in the second core block (13) is the third unit (113), the second unit (112) and the third unit (113) in sequence; wherein the circumferential length of the stator tooth shoe (3) of the first unit (111) is greater than the circumferential length of the stator tooth shoe (3) of the second unit (112); and the circumferential length of the stator tooth shoe (3) of the second unit (112) is greater than the circumferential length of the stator tooth shoe (3) of the third unit (113).

18. The stator structure according to claim 16 or 17, characterized in that: In the adjacent first core blocks (12) and the second core blocks (13), the width of the stator slot (15) formed between the first unit (111) and the third unit (113) located at the same axial height is equal to the width of the stator slot (15) formed between the adjacent second units (112).

19. The stator structure according to claim 1, characterized in that: The stator teeth (4) are respectively wound with a main phase winding and an auxiliary phase winding, the main phase winding and the auxiliary phase winding are alternately wound in sequence, the main phase winding and the auxiliary phase winding have different winding directions, and the relationship between the number of turns N1 of the main phase winding and the number of turns N2 of the auxiliary phase winding satisfies 0.85*N1≤N2≤0.95*N1.

20. A single-phase induction motor, characterized in that: The single-phase induction motor adopts concentrated winding, and the single-phase induction motor comprises a stator structure and a rotor structure. The stator structure is sleeved outside the rotor structure, and the stator structure is the stator structure described in any one of claims 1 to 19.

21. The single-phase induction motor according to claim 20, characterized in that When the maximum width of the stator slot (15) formed between the adjacent first core block (12) and the second core block (13) is H3, the rotor structure comprises a rotor core (2), the rotor core (2) is provided with a conductor slot (6), the rotor core (2) is provided with a rotor slot (21) on the radial outer side of the conductor slot (6), the width of the rotor slot (21) is H5, and 2*H5≤H3≤3*H5.

22. The single-phase induction motor according to claim 20, characterized in that The rotor structure comprises a rotor core (2), the rotor core (2) is provided with a conductor slot (6), the conductor slot (6) is filled with conductive non-magnetic material, a rotor tooth shoe (7) is provided on the radial outer side of the rotor core (2), a rotor slot (21) is formed between adjacent rotor tooth shoes (7), and in a cross section perpendicular to the central axis of the rotor core (2), the maximum angle formed by the line connecting the end points at both ends of the rotor tooth shoe (7) in the circumferential direction and the central axis of the rotor core (2) is α3, and the angle formed by the line connecting the end points at both ends of the stator tooth shoe (3) in the circumferential direction and the central axis of the stator core (1) is α, 0.3*α≤α3≤0.5*α.

23. The single-phase induction motor according to claim 20, characterized in that The rotor structure comprises a rotor core (2), the rotor core (2) being provided with conductor slots (6), wherein in a cross section perpendicular to the central axis of the rotor core (2), there are a plurality of conductor slots (6) which are evenly arranged along the circumference of the rotor core (2), the circumferential width of the conductor slots (6) gradually decreases along a direction approaching an axial hole, and the small end of the conductor slot (6) points to the axial hole.

24. The single-phase induction motor according to claim 23, characterized in that In a cross section perpendicular to the central axis of the rotor core (2), the rotor core (2) is provided with a rotor slot (21) on the radially outer side of the conductor slot (6), the rotor slot (21) passes through the outer circle of the rotor from the end of the conductor slot (6) away from the shaft hole, the diameter of the circle where the radial inner end of the rotor slot (21) is located is D2, the diameter of the circle where the radial outer end of the rotor slot (21) is located is D1, and 0.965*D1≤D2<D1.

25. The single-phase induction motor according to claim 23, characterized in that In a cross section perpendicular to the central axis of the rotor core (2), the rotor core (2) is provided with a rotor slot (21) on the radial outer side of the conductor slot (6), the rotor slot (21) passes through the outer circle of the rotor from the end of the conductor slot (6) away from the shaft hole, the diameter of the circle where the radial outer end of the rotor slot (21) is located is D1, the diameter of the circle where the radial inner end of the conductor slot (6) is located is D3, and 0.45*D1≤D3≤0.6D1.

26. The single-phase induction motor according to claim 23, characterized in that In a cross section perpendicular to the central axis of the rotor core (2), the conductor slot (6) comprises a first arc segment (61) located radially outward, a second arc segment (62) located radially inward, and a straight line segment (63) connected between the first arc segment (61) and the second arc segment (62), the radius of the first arc segment (61) is R1, the total radial length of the conductor slot (6) is L3, and 0.15*L3≤R1≤0.25*L3.

27. The single-phase induction motor according to claim 23, characterized in that In a cross section perpendicular to the central axis of the rotor core (2), the conductor slot (6) comprises a first circular arc segment (61) located radially outward, a second circular arc segment (62) located radially inward, and a straight line segment (63) connected between the first circular arc segment (61) and the second circular arc segment (62), the radius of the first circular arc segment (61) is R1, the radius of the second circular arc segment (62) is R2, and 2*R2≤R1≤3*R2.

28. The single-phase induction motor according to claim 23, characterized in that In a cross section perpendicular to the central axis of the rotor core (2), the conductor slot (6) comprises a first arc segment (61) located radially outward, a second arc segment (62) located radially inward, and a straight line segment (63) connected between the first arc segment (61) and the second arc segment (62); the conductor slot (6) is symmetrical about an axis of symmetry formed by a center line connecting the first arc segment (61) and the second arc segment (62); an angle between the straight line segment (63) and the axis of symmetry is α4, 0.4*360° / Z2≤α4≤0.6*360° / Z2, and Z2 is the number of conductor slots (6) on the rotor core (2).

29. The single-phase induction motor according to claim 23, characterized in that In a cross section perpendicular to the central axis of the rotor core (2), the rotor core (2) is provided with a rotor slot (21) on the radial outer side of the conductor slot (6), the conductor slot (6) comprises a first circular arc segment (61) located on the radial outer side, a second circular arc segment (62) located on the radial inner side, and a straight line segment (63) connected between the first circular arc segment (61) and the second circular arc segment (62), the width of the rotor slot (21) is H5, the radius of the first circular arc segment (61) is R1, and 0.2*R1≤H5≤0.5R1.

30. The single-phase induction motor according to claim 20, characterized in that The rotor structure comprises a rotor core (2), the rotor core (2) is provided with conductor slots (6), rotor teeth (22) and rotor tooth shoes (7) are formed between adjacent conductor slots (6), the conductor slots (6) are filled with conductive non-magnetic material, the rotor tooth shoes (7) are located radially outside the rotor teeth (22), rotor notches (21) are formed between adjacent rotor tooth shoes (7), and in a cross section perpendicular to the central axis of the rotor core (2), the minimum width of the rotor teeth (22) is H8, the maximum width of the rotor tooth shoes (7) is H9, and 0.25*H9≤H8≤0.5*H9.

Images