Rotor structure and single-phase induction motor

Abstract

The application provides a rotor structure and a single-phase induction motor. The rotor structure comprises a rotor core (2), a plurality of conductor grooves (6) are arranged on the rotor core (2), and rotor slots (21) extending to the outer circle of the rotor are arranged on the outer side of the conductor grooves (6). The rotor slots (21) are divided into a plurality of groups, each group of rotor slots (21) comprises at least two kinds of rotor slots (21) with different radial heights, and the plurality of groups of rotor slots (21) are arranged in sequence and at intervals along the circumference of the rotor core (2), and the rotor toothed shoes (8) are formed between adjacent rotor slots (21). According to the rotor structure, the air gap magnetic field harmonics of the motor can be reduced, the influence of electromagnetic force can be reduced, and the vibration noise of the motor can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a rotor structure and a single-phase induction motor. BACKGROUND

[0002] At present, the winding utilization rate of the single-phase induction motor with single-phase concentrated winding is high, the slot is less, the winding time is short, the copper consumption of the winding can be effectively reduced, and the process cost is low, so it is widely used in various fields such as air conditioners and household appliances; but the number of stator slots of the concentrated winding is less, the stator tooth harmonic frequency is low, and the harmonic amplitude is large, the low-order harmonic will cause the motor to appear low-order electromagnetic force, which is easy to cause the motor to appear vibration noise problem. SUMMARY

[0003] The main purpose of the present application is to provide a rotor structure and a single-phase induction motor, which can reduce the air gap magnetic field harmonic of the motor, reduce the influence of electromagnetic force, and reduce the vibration noise of the motor.

[0004] In order to achieve the above purpose, according to one aspect of the present application, a rotor structure is provided, which comprises a rotor core, a plurality of conductor slots are arranged on the rotor core, a rotor slot opening extending to the outer circle of the rotor is arranged on the radial outer side of the conductor slot, the rotor slot opening is divided into a plurality of groups, each group of rotor slot openings comprises at least two kinds of rotor slot openings with different radial heights, the plurality of groups of rotor slot openings are arranged in sequence along the circumference of the rotor core, and the rotor tooth boots are formed between the adjacent rotor slot openings.

[0005] Further, the rotor slot opening comprises a first slot opening and a second slot opening, the radial height of the first slot opening is greater than the radial height of the second slot opening, the number of the first slot openings is less than or equal to the number of the second slot openings, and the asymmetric rotor tooth boots are formed between the adjacent first slot openings and second slot openings.

[0006] Further, in the cross section perpendicular to the central axis of the rotor core, the radial outer side of the rotor tooth boot comprises a first arc segment and a second arc segment, the first arc segment extends from the first slot opening to the second slot opening, the second arc segment extends from the second slot opening to the first slot opening, the first arc segment and the second arc segment are tangent at the intersection point, and the diameter of the first arc segment is greater than the diameter of the second arc segment.

[0007] Further, the included angle between the connecting line of the two end points of the circumferential ends of the rotor tooth boot and the central axis of the rotor core is α2, the included angle between the connecting line of the two end points of the second arc segment and the central axis of the rotor core is α5, and 0.4*α2≤α5≤0.6*α2.

[0008] Further, the radial height of the first slot opening is L5, the radial height of the second slot opening is L6, and 0.3*L5≤L6<L5.

[0009] Further, in the cross section perpendicular to the central axis of the rotor core, the conductor slot comprises a first circular arc segment located at the radial outer side, a second circular arc segment located at the radial inner side, and a straight line segment connected between the first circular arc segment and the second circular arc segment, and the relationship between the radius R1 of the first circular arc segment and the total length L7 of the conductor slot satisfies 0.15*L7≤R1≤0.25*L7.

[0010] Further, in the cross section perpendicular to the central axis of the rotor core, the conductor slot comprises a first circular arc segment located at the radial outer side, a second circular arc segment located at the radial inner side, and a straight line segment connected between the first circular arc segment and the second circular arc segment, and the relationship between the radius R1 of the first circular arc segment and the radius R2 of the second circular arc segment satisfies 2*R2≤R1≤3*R2.

[0011] Further, in the cross section perpendicular to the central axis of the rotor core, the conductor slot comprises a first circular arc segment located at the radial outer side, a second circular arc segment located at the radial inner side, and a straight line segment connected between the first circular arc segment and the second circular arc segment, and the relationship between the width H5 of the rotor slot opening and the radius R1 of the first circular arc segment satisfies 0.2*R1≤H5≤0.5*R1.

[0012] Further, the rotor tooth and the rotor tooth shoe are formed between the two adjacent conductor slots, the minimum width of the rotor tooth is H8, the maximum width of the rotor tooth shoe is H9, and 0.15*H9≤H8≤0.5*H9.

[0013] Further, in the same group of rotor slot openings, the number of first slot openings is one, and the number of second slot openings is two, one of the second slot openings is adjacent to the first slot opening, and the two second slot openings are adjacent to each other.

[0014] According to another aspect of the present application, a single-phase induction motor is provided, the single-phase induction motor adopts a 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, the stator structure comprises a stator core, and the rotor structure is the above-mentioned rotor structure.

[0015] Further, the maximum width of the air gap between the rotor tooth shoe and the stator structure is L3, the minimum width of the air gap between the rotor tooth shoe and the stator structure is L4, and L4

[0016] Further, the stator structure comprises a stator tooth shoe, in the cross section perpendicular to the central axis of the stator core, the included angle between the connecting line of the end points of the circumferential two ends of the stator tooth shoe and the central axis of the stator core is α1, 0.85*360° / Z1≤α1≤360° / Z1, Z1 is the number of stator teeth, the included angle between the connecting line of the end points of the circumferential two ends of the rotor tooth shoe and the central axis of the rotor core is α2, and 0.4*α1≤α2≤0.6*α1.

[0017] Further, the stator structure comprises stator tooth shoes, and a side of the stator tooth shoes close to the central axis of the stator core comprises a tooth shoe circular arc segment in the middle and a cut edge at both ends, an included angle between two ends of the tooth shoe circular arc segment and a line connecting the central axis of the stator core is α3, and an included angle formed by end points of circumferential two ends of the stator tooth shoes and the central axis of the stator core is α1, 0.7*α1≤α3≤0.95*α1.

[0018] Further, the stator structure comprises stator tooth shoes, and in a cross section perpendicular to the central axis of the stator core, a side of the stator tooth shoes close to the central axis of the stator core comprises a tooth shoe circular arc segment in the middle and a cut edge at both ends, a distance between two ends of the tooth shoe circular arc segment is H2, and a maximum distance between end points of circumferential two ends of the stator tooth shoes is H1, 0.6*H1≤H2<H1.

[0019] Further, the stator structure comprises stator tooth shoes, and a stator slot is formed between adjacent stator tooth shoes, and in a cross section perpendicular to the central axis of the stator core, a side of the stator tooth shoes close to the central axis of the stator core comprises a tooth shoe circular arc segment in the middle and a cut edge at both ends, a maximum depth of the cut edge along the radial direction of the stator core is L2, a total depth of the stator slot along the radial direction of the stator core is L1, and 0.3*L1≤L2≤0.6*L1.

[0020] Further, the stator structure comprises stator tooth shoes and stator tooth portions, and in a cross section perpendicular to the central axis of the stator core, an included angle formed between a hypotenuse of a side of the stator tooth shoes away from the central axis of the stator core and a side of the adjacent stator tooth portion is α4, and 100°≤α4≤130°.

[0021] Further, 110°≤α4≤120°.

[0022] Further, the stator structure comprises stator tooth shoes, and a stator slot is formed between adjacent stator tooth shoes, and in a cross section perpendicular to the central axis of the stator core, a maximum width of the stator slot is H3, and a width of the rotor slot is H5, and 2*H5≤H3≤3*H5.

[0023] Further, the stator structure comprises stator tooth shoes, and a stator slot is formed between adjacent stator tooth shoes, and in a cross section perpendicular to the central axis of the stator core, a side of the stator tooth shoes close to the central axis of the stator core comprises a tooth shoe circular arc segment in the middle and a cut edge at both ends, a maximum width of the stator slot is H3, and a distance between end points of the adjacent cut edges of the two adjacent stator tooth shoes away from one end of the stator slot is H4, and 1.5*H3≤H4≤3*H3.

[0024] Further, 2*H3≤H4≤2.5*H3.

[0025] Further, the stator structure comprises a stator tooth and a stator tooth portion, in a cross section perpendicular to the central axis of the stator core, the maximum distance between the end points of the circumferential two ends of the stator tooth is H1, the width of the stator tooth portion is H6, 0.4*H1≤H6≤0.7*H1.

[0026] Further, the stator structure comprises a stator tooth portion and a yoke portion, in a cross section perpendicular to the central axis of the stator core, the width of the stator tooth portion is H6, the width of the yoke portion is H7, H7≤H6≤1.5*H7.

[0027] Further, the stator structure comprises a stator tooth portion, the main phase winding and the auxiliary phase winding are respectively wound on the stator tooth portion, the main phase winding and the auxiliary phase winding are alternately wound in sequence, the winding directions of the main phase winding and the auxiliary phase winding are different, 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.

[0028] Further, the stator core comprises a stator lamination, the stator lamination comprises a stator tooth portion and a yoke portion, the stator lamination comprises a chain structure composed of 8 stator tooth portions, the chain structure forms an octagonal outer contour through the yoke portion, the stator core comprises a stator slot surrounded by the stator tooth portion and the yoke portion, and the side of the stator tooth portion forming the stator slot is perpendicular to the side of the yoke portion.

[0029] The application discloses a single-phase induction motor rotor structure and a single-phase induction motor, and belongs to the technical field of single-phase induction motor rotor structures. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification. The embodiments of the application, and their

[0031] Figure 1 A structural schematic diagram of a rotor structure of an embodiment of the application is shown;

[0032] Figure 2 A structural schematic diagram of a single-phase induction motor of an embodiment of the application is shown;

[0033] Figure 3 A structural schematic diagram of a stator structure of an embodiment of the application is shown;

[0034] Figure 4 A structural schematic diagram of a rotor structure of an embodiment of the application is shown;

[0035] Figure 5 A structural schematic diagram of a rotor structure of an embodiment of the application is shown;

[0036] Figure 6 A relationship diagram of L3 / L4 and 4th electromagnetic force harmonic amplitude of a single-phase induction motor of an embodiment of the application is shown;

[0037] Figure 7 A relationship diagram of a2 / a1 and torque ripple of a single-phase induction motor of an embodiment of the application is shown;

[0038] Figure 8 A relationship diagram of H3 / H5 and additional torque of a single-phase induction motor of an embodiment of the application is shown;

[0039] Figure 9 A relationship diagram of N2 / N1 and 3rd tooth harmonic amplitude of a single-phase induction motor of an embodiment of the application is shown;

[0040] Figure 10 A comparison diagram of electromagnetic force harmonic amplitude of a single-phase induction motor of an embodiment of the application and a single-phase induction motor of the related art is shown;

[0041] Figure 11 A comparison diagram of speed-torque relationship of a single-phase induction motor of an embodiment of the application and a single-phase induction motor of the related art is shown; and

[0042] Figure 12 A comparison diagram of torque curve of a single-phase induction motor of an embodiment of the application and a single-phase induction motor of the related art is shown.

[0043] Wherein, the above drawings include the following reference signs:

[0044] 1, stator core; 11, yoke; 12, stator slot; 13, stator slot; 2, rotor core; 21, rotor slot; 22, rotor tooth; 3, stator lamination; 71, bevel; 72, cut edge; 73, tooth shoe circular arc segment; 4, stator tooth; 5, rotor lamination; 6, conductor slot; 61, first circular arc segment; 62, second circular arc segment; 63, straight line segment; 7, stator tooth shoe; 8, rotor tooth shoe; 9, first slot; 10, second slot. DETAILED DESCRIPTION

[0045] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0046] For reference Figures 1 to 12 As shown in the drawings, according to the embodiment of the present application, the rotor structure includes a rotor core 2, a plurality of conductor slots 6 are arranged on the rotor core 2, a rotor slot 21 extending to the outer circle of the rotor is arranged on the radially outer side of the conductor slot 6, the rotor slot 21 is divided into multiple groups, each group of rotor slots 21 includes at least two rotor slots 21 with different radial heights, the multiple groups of rotor slots 21 are arranged in sequence along the circumference of the rotor core 2, and the rotor tooth shoe 8 is formed between adjacent rotor slots 21. The conductor slot 6 is filled with conductive non-magnetic material.

[0047] The rotor structure optimizes the rotor slot 21, adopts a structure in which the rotor slot 21 is not equal in height along the radial direction, so that the rotor tooth shoe 8 can form an asymmetric structure, the transition from the high slot in the rotor slot 21 to the low slot, and the outer diameter of the rotor is not a complete circle. In this way, the air gap formed between the stator structure and the rotor structure is a transition from small air gap to large air gap or a transition from large air gap to small air gap, and the air gap width formed between the stator structure and the rotor structure is not equal in width. This can make the air gap magnetic flux waveform of the single-phase induction motor tend to be a sine wave, reduce the influence of air gap harmonics, and reduce the vibration and noise of the motor. At the same time, it can weaken the tooth harmonics and reduce the torque ripple of the single-phase induction motor.

[0048] In one embodiment, the conductive non-magnetic material is aluminum or red copper, etc.

[0049] In one embodiment, the rotor core 2 includes a rotor lamination 5, and the rotor core 2 is stacked by a plurality of rotor laminations 5 along the axial direction.

[0050] In one embodiment, the rotor slot 21 includes a first slot 9 and a second slot 10, the radial height of the first slot 9 is greater than the radial height of the second slot 10, the number of the first slot 9 is less than or equal to the number of the second slot 10, and the asymmetric rotor tooth shoe 8 is formed between the first slot 9 and the second slot 10 arranged adjacent to each other.

[0051] In this embodiment, the conductor slot 6 has two rotor slots 21 with different heights, namely the first slot 9 and the second slot 10. The first slot 9 and the second slot 10 with different heights are alternately distributed on the outer periphery of the rotor. The adjacent first slot 9 and the second slot 10 form an asymmetrical rotor tooth shoe 8, which can adjust the air gap between the rotor structure and the stator structure, so that the width of the air gap formed between the stator structure and the rotor structure is not equal. This can make the air gap magnetic flux density waveform of the single-phase induction motor tend to be a sine wave, reduce the influence of air gap magnetic field harmonics, and reduce the vibration noise of the motor.

[0052] When setting the first slot 9 and the second slot 10, it is necessary to ensure that the number of the first slot 9 is less than or equal to the number of the second slot 10, and that in each group of rotor slots 21, the first slot 9 is set continuously and the second slot 10 is set continuously. The number of the first slot 9 can be one, two or more, and the number of the second slot 10 can be one, two or more.

[0053] In one embodiment, in the same group of rotor slots 21, there is one first slot 9 and two second slots 10, one of which is adjacent to the first slot 9, and the two second slots 10 are adjacent to each other.

[0054] In one embodiment, when the same group of rotor slots 21 includes three rotor slots 21 of different heights, the rotor slots 21 in the same group of rotor slots 21 are arranged sequentially in an increasing height manner or in a decreasing height manner along the axial direction.

[0055] Assuming the number of rotor conductor slots is Z2 = 18, see also... Figure 1 As shown, one first slot 9 and one second slot 10 are adjacent to each other, with nine sets of each type, resulting in an asymmetrical rotor toothed shoe structure; see also [reference needed]. Figure 4 As shown, two second slots 10 are adjacent to one first slot 9, and there are six groups of second slots 10 and six groups of first slots 9, thus forming an asymmetrical rotor toothed shoe structure; see also [reference needed]. Figure 5 As shown, five second slots 10 are grouped together and one first slot 9 is adjacent to each other. There are three groups of second slots 10 and three groups of first slots 9, thus forming an asymmetrical rotor tooth shoe structure. In summary, when the number of rotor conductor slots Z2 is constant, the number of groups of second slots 10 and the number of groups of first slots 9 are the same.

[0056] In one embodiment, in a cross section perpendicular to the central axis of the rotor core 2, the radially outer side of the rotor tooth shoe 8 comprises a first arc segment and a second arc segment, the first arc segment extends from the first notch 9 to the second notch 10, the second arc segment extends from the second notch 10 to the first notch 9, the first arc segment and the second arc segment are tangent at the intersection point, the diameter of the first arc segment is greater than the diameter of the second arc segment.

[0057] In the present embodiment, the first arc segment and the second arc segment are tangent at the intersection point, which can make the first arc segment and the second arc segment form a smooth transition arc surface structure, thereby ensuring the continuity of the air gap change between the rotor structure and the stator structure, making the air gap flux more tend to be sinusoidal, and reducing the influence of air gap magnetic field harmonics.

[0058] In one embodiment, the center of the first arc segment coincides with the central axis of the rotor core 2, and the center of the second arc segment is offset relative to the central axis of the rotor core 2, thereby forming an eccentric arc, so that the centers of the first arc segment and the second arc segment are different, which is more convenient for forming a continuously changing air gap.

[0059] In one embodiment, the center of the second arc segment is located on the line between the intersection point of the first arc segment and the second arc segment and the central axis of the rotor core 2.

[0060] In one embodiment, the first arc segment and the second arc segment are concentric and are eccentrically arranged relative to the central axis of the rotor core 2.

[0061] In one embodiment, the angle formed by the line connecting the end points of the circumferential ends of the rotor tooth shoe 8 and the central axis of the rotor core 2 is α2, the angle formed by the line connecting the end points of the two ends of the second arc segment and the central axis of the rotor core 2 is α5, and 0.4*α2≤α5≤0.6*α2.

[0062] Such design is to ensure that the single-phase induction motor has a certain large air gap area, so that the air gap width of the single-phase induction motor is not equal, which can reduce the air gap magnetic field harmonics of the single-phase induction motor.

[0063] In one embodiment, the radial height of the first notch 9 is L5, the radial height of the second notch 10 is L6, and 0.3*L5≤L6<L5. Such arrangement can ensure the mechanical strength at the rotor notch 21.

[0064] In one embodiment, in the cross section perpendicular to the central axis of the rotor core 2, the conductor slot 6 comprises a first circular arc segment 61 located at the radial outer side, a second circular arc segment 62 located at 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, and the relationship between the radius R1 of the first circular arc segment 61 and the total radial length L7 of the conductor slot 6 satisfies 0.15*L7≤R1≤0.25*L7.

[0065] This arrangement can make full use of the rotor space to arrange the conductor slot 6, improve the starting ability of the motor, and at the same time ensure the rotor magnetic field magnetic circuit and improve the output ability of the motor.

[0066] In one embodiment, in the cross section perpendicular to the central axis of the rotor core 2, the conductor slot 6 comprises a first circular arc segment 61 located at the radial outer side, a second circular arc segment 62 located at 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, and the relationship between the radius R1 of the first circular arc segment 61 and the radius R2 of the second circular arc segment 62 satisfies 2*R2≤R1≤3*R2.

[0067] This arrangement can avoid the magnetic flux passage between the slot bottom circular arcs near the outer circle of the rotor being too wide or too narrow, which affects the saturation degree of the rotor magnetic circuit.

[0068] In one embodiment, in the cross section perpendicular to the central axis of the rotor core 2, the conductor slot 6 comprises a first circular arc segment 61 located at the radial outer side, a second circular arc segment 62 located at 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, and the relationship between the width H5 of the rotor slot opening 21 and the radius R1 of the first circular arc segment 61 satisfies 0.2*R1≤H5≤0.5*R1.

[0069] This arrangement can limit the width of the rotor slot opening, increase the tooth harmonic frequency, reduce the tooth harmonic amplitude, weaken the asynchronous additional torque, and improve the starting ability of the single-phase induction motor.

[0070] In one embodiment, the rotor tooth portion 22 and the rotor tooth shoe 8 are formed between two adjacent conductor slots 6, the minimum width of the rotor tooth portion 22 is H8, the maximum width of the rotor tooth shoe 8 is H9, and 0.15*H9≤H8≤0.5*H9.

[0071] This arrangement can ensure sufficient rotor magnetic circuit space, reduce the rotor saturation degree, and improve the efficiency of the single-phase induction motor.

[0072] For reference Figures 1 to 12 As shown, according to the embodiment of the present application, 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, the stator structure comprises a stator core 1, and the rotor structure is the above-mentioned rotor structure.

[0073] In one embodiment, the maximum width of the air gap formed between the rotor tooth shoe 8 and the stator structure is L3, the minimum width of the air gap formed between the rotor tooth shoe 8 and the stator structure is L4, L4 < L3 ≤ 4 * L4.

[0074] By limiting the relationship between the maximum width and the minimum width of the air gap, the rotor tooth shoe 8 can form an asymmetric structure, and the air gap width formed between the stator core and the rotor core is not equal, which can reduce the air gap magnetic field harmonic of the single-phase induction motor using concentrated winding, reduce the influence of electromagnetic force, and reduce the vibration noise of the single-phase induction motor.

[0075] For reference Figure 6 As shown in the relationship curve between the ratio L3 / L4 of the maximum air gap width and the minimum air gap width of the single-phase induction motor of the embodiment of the present application and the 4th electromagnetic force harmonic amplitude, under the same working condition, when the maximum width L3 of the air gap formed between the rotor tooth shoe and the stator core and the minimum width L4 of the air gap formed between the rotor tooth shoe and the stator core satisfy L4 ≤ L3 ≤ 4 * L4, the 4th electromagnetic force harmonic amplitude is low, which can reduce the influence of electromagnetic force and reduce the main vibration noise peak of the motor.

[0076] In one embodiment, the stator structure includes a stator tooth shoe 7, and in a cross section perpendicular to the central axis of the stator core 1, the angle formed by the connection line of the end points of the circumferential two ends of the stator tooth shoe 7 and the central axis of the stator core 1 is α1, 0.85 * 360° / Z1 ≤ α1 ≤ 360° / Z1, Z1 is the number of stator teeth, and the angle formed by the connection line of the end points of the circumferential two ends of the rotor tooth shoe 8 and the central axis of the rotor core 2 is α2, 0.4 * α1 ≤ α2 ≤ 0.6 * α1.

[0077] By limiting the angle range of the stator tooth shoe 7 and the rotor tooth shoe 8, the magnetic circuit of the stator and the rotor can be ensured to be smooth, the magnetic flux can flow more smoothly, the magnetic flux leakage can be reduced, the output of the motor can be increased, and thus the efficiency of the motor can be improved.

[0078] For reference Figure 7 As shown in the relationship curve between the ratio α2 / α1 of the rotor tooth shoe angle range and the stator tooth shoe angle range of the single-phase induction motor of the embodiment of the present application and the torque ripple, under the same working condition, when the ratio relationship of α2 / α1 satisfies 0.4 * α1 ≤ α2 ≤ 0.6 * α1, the value of the torque ripple of the single-phase induction motor is small, which can reduce the torque ripple, reduce the main vibration peak, and reduce the noise of the single-phase induction motor.

[0079] In one embodiment, the stator structure comprises the stator tooth shoes 7, and the side of the stator tooth shoes 7 close to the central axis of the stator core 1 comprises a tooth shoe circular arc segment 73 in the middle and a cut edge 72 at both ends, the included angle between the two ends of the tooth shoe circular arc segment 73 and the line connecting the central axis of the stator core 1 is α3, and the included angle formed by the end points of the circumferential two ends of the stator tooth shoes 7 and the central axis of the stator core 1 is α1, 0.7*α1≤α3≤0.95*α1.

[0080] By setting the cut edge 72 at both ends of the stator tooth shoes 7, the position relationship between the rotor magnetic flux channel and the stator slot can be changed, and the tooth slot effect and current harmonics can be effectively reduced.

[0081] In one embodiment, the stator structure comprises the stator tooth shoes 7, and in the cross section perpendicular to the central axis of the stator core 1, the side of the stator tooth shoes 7 close to the central axis of the stator core 1 comprises a tooth shoe circular arc segment 73 in the middle and a cut edge 72 at both ends, the distance between the two ends of the tooth shoe circular arc segment 73 is H2, the maximum distance between the end points of the circumferential two ends of the stator tooth shoes 7 is H1, and 0.6*H1≤H2<H1.

[0082] Limiting the width of the stator tooth shoes 7 can change the magnetic circuit of the stator tooth shoe part on the one hand, reduce the magnetic flux leakage, and on the other hand, can ensure the mechanical strength of the stator tooth shoe part and prevent the deformation of the stator tooth shoe part.

[0083] In one embodiment, the stator structure comprises the stator tooth shoes 7, and the stator slot 12 is formed between adjacent stator tooth shoes 7, and in the cross section perpendicular to the central axis of the stator core 1, the side of the stator tooth shoes 7 close to the central axis of the stator core 1 comprises a tooth shoe circular arc segment 73 in the middle and a cut edge 72 at both ends, the maximum depth of the cut edge 72 along the radial direction of the stator core 1 is L2, the total depth of the stator slot 12 along the radial direction of the stator core 1 is L1, and 0.3*L1≤L2≤0.6*L1.

[0084] By limiting the relationship between the radial depth of the cut edge 72 and the radial depth of the stator slot 12, the smoothness of the stator magnetic circuit can be ensured while preventing the deformation of the stator tooth shoe part.

[0085] In one embodiment, the stator structure comprises the stator tooth shoes 7 and the stator tooth parts 4, and in the cross section perpendicular to the central axis of the stator core 1, the included angle between the bevel 71 of the side of the stator tooth shoes 7 away from the central axis of the stator core 1 and the side of the adjacent stator tooth parts 4 is α4, and 100°≤α4≤130°.

[0086] In one embodiment, 110°≤α4≤120°.

[0087] By the above limitation, certain stator slot area can be ensured, reasonable arrangement space is provided for the main and auxiliary phase windings, harmonic is weakened, motor vibration noise is reduced, reasonable stator magnetic circuit is reserved for the magnetic flux, and stator magnetic field saturation is avoided.

[0088] In one embodiment, the stator structure includes stator tooth shoes 7, and the stator slot 12 is formed between adjacent stator tooth shoes 7, the maximum width of the stator slot 12 is H3, and the width of the rotor slot 21 is H5 in the cross section perpendicular to the central axis of the stator core 1, 2*H5≤H3≤3*H5.

[0089] By limiting the relationship between the width of the stator slot 12 and the width of the rotor slot 21, the tooth harmonic frequency 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.

[0090] For reference Figure 8 As shown in the figure, the ratio of the width of the stator slot 12 to the width of the rotor slot 21 of the single-phase induction motor of the embodiment of the application is H3 / H5, and the relationship curve of the additional torque, under the same working condition, when the ratio of H3 / H5 satisfies 2*H5≤H3≤3*H5, the additional torque of the single-phase induction motor is at a lower level, and the additional torque value increases slowly, which can reduce the additional torque of the single-phase induction motor, and the motor is easier to start.

[0091] In one embodiment, the stator structure includes stator tooth shoes 7, and the stator slot 12 is formed between adjacent stator tooth shoes 7, the side of the stator tooth shoe 7 close to the central axis of the stator core 1 includes a tooth shoe circular arc segment 73 in the middle and a cutting edge 72 at both ends in the cross section perpendicular to the central axis of the stator core 1, the maximum width of the stator slot 12 is H3, the distance between the adjacent cutting edges 72 of the two adjacent stator tooth shoes 7 at the endpoints away from one end of the stator slot 12 is H4, and 1.5*H3≤H4≤3*H3.

[0092] In one embodiment, 2*H3≤H4≤2.5*H3.

[0093] By limiting the width of the stator slot 12 formed by the cutting edge 72 of the stator tooth shoe 7, the tooth harmonic frequency can be increased, the tooth harmonic amplitude can be reduced, the single-phase induction motor starting torque can be improved, and the single-phase induction motor starting ability can be improved.

[0094] In one embodiment, the stator structure includes stator tooth shoes 7 and stator teeth 4, the maximum distance between the endpoints of the circumferential ends of the stator tooth shoe 7 is H1 in the cross section perpendicular to the central axis of the stator core 1, the width of the stator tooth 4 is H6, and 0.4*H1≤H6≤0.7*H1.

[0095] By limiting the size relationship between the stator tooth shoe 7 and the stator tooth 4, the magnetic lines can easily enter the stator core 1, and the magnetic circuit of the stator core 1 is not easily saturated.

[0096] In one embodiment, the stator structure includes the stator tooth 4 and the yoke 11, and in the cross section perpendicular to the central axis of the stator core 1, the width of the stator tooth 4 is H6, and the width of the yoke 11 is H7, H7≤H6≤1.5*H7.

[0097] By limiting the relationship between the width of the stator tooth and the width of the yoke, the stator space can be reasonably utilized, and the magnetic flux of the stator can be ensured to flow smoothly while avoiding magnetic field saturation.

[0098] In one embodiment, the stator structure includes the stator tooth 4, the stator tooth 4 is respectively wound with the main phase winding and the auxiliary phase winding, the main phase winding and the auxiliary phase winding are alternately wound in sequence, the winding directions of the main phase winding and the auxiliary phase winding are different, 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.

[0099] By setting reasonable main and auxiliary phase turns, the tooth harmonic can be weakened, the noise and harmonic loss can be reduced, and the motor efficiency can be improved.

[0100] For reference Figure 9 As shown in the figure, it is a relationship curve diagram of the ratio N2 / N1 between the number of turns N2 of the auxiliary phase winding and the number of turns N1 of the main phase winding of the single-phase induction motor of the embodiment of the present application and the third-order tooth harmonic amplitude, under the same working condition, when the number of turns N1 of the main phase winding and the number of turns N2 of the auxiliary phase winding satisfy 0.85*N1≤N2≤0.95*N1, the third-order tooth harmonic amplitude of the single-phase induction motor is at a low level, the tooth harmonic amplitude can be weakened, and the vibration noise of the motor can be reduced.

[0101] In one embodiment, the stator core 1 includes the stator punching sheet 3, the stator punching sheet 3 includes the stator tooth 4 and the yoke 11, the stator punching sheet 3 includes a chain structure composed of 8 stator teeth 4, the chain structure forms an octagonal outer contour through the yoke 11 in a head-to-tail manner, the stator core 1 includes the stator wire slot 13 surrounded by the stator tooth 4 and the yoke 11, and the side of the stator tooth 4 forming the stator wire slot 13 is perpendicular to the side of the yoke 11.

[0102] For reference Figures 10 to 12As shown, it is a single-phase induction motor electromagnetic force harmonic amplitude comparison diagram, a speed-torque relationship comparison diagram and a torque curve comparison diagram of the single-phase induction motor and related technologies of the single-phase induction motor of the embodiment of the application, compared with the single-phase induction motor of the related technologies, the electromagnetic force harmonic amplitude of each order of the single-phase induction motor of the embodiment of the application is reduced; the torque change in the low-speed stage is more gentle, 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 harmonic and reduce the motor vibration noise.

[0103] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should be further understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0104] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein.

[0105] The above is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A rotor structure, characterized in that, The rotor core (2) is provided with a plurality of conductor slots (6). A rotor slot (21) extending to the outer circumference of the conductor slots (6) is formed on the radially outer side of the rotor core (2). The rotor slots (21) are divided into multiple groups, each group including at least two types of rotor slots (21) with different radial heights. The multiple groups of rotor slots (21) are arranged sequentially at intervals along the circumference of the rotor core (2), and rotor teeth (8) are formed between adjacent rotor slots (21). The rotor slots (21) include a first slot (9) and a second slot (10). The radial height of the first slot (9) is greater than the radial height of the second slot (10), and the number of the first slots (9) is less than or equal to the number of the second slots (10). The number of adjacent slots (9) and slots (10) form an asymmetrical rotor tooth shoe (8); the radial height of the first slot (9) is L5, the radial height of the second slot (10) is L6, and 0.3*L5≤L6<L5; in the cross section perpendicular to the central axis of the rotor core (2), the conductor slot (6) includes a first arc segment (61) located on the radially outer side, a second arc segment (62) located on the radially inner side, and a straight segment (63) connecting the first arc segment (61) and the second arc segment (62). The relationship between the radius R1 of the first arc segment (61) and the total radial length L7 of the conductor slot (6) satisfies 0.15*L7≤R1≤0.25*L7.

2. The rotor structure according to claim 1, characterized in that, In a cross section perpendicular to the central axis of the rotor core (2), the radial outer side of the rotor tooth shoe (8) includes a first arc segment and a second arc segment. The first arc segment extends from the first slot (9) to the second slot (10), and the second arc segment extends from the second slot (10) to the first slot (9). The first arc segment and the second arc segment are tangent at the intersection point, and the diameter of the first arc segment is greater than the diameter of the second arc segment.

3. The rotor structure according to claim 2, characterized in that, The angle formed by the line connecting the two ends of the rotor tooth shoe (8) in the circumferential direction with the central axis of the rotor core (2) is α2, and the angle formed by the line connecting the two ends of the second arc segment with the central axis of the rotor core (2) is α5, 0.4*α2≤α5≤0.6*α2.

4. The rotor structure according to claim 1, characterized in that, In a cross section perpendicular to the central axis of the rotor core (2), the conductor groove (6) includes a first arc segment (61) located on the outer side, a second arc segment (62) located on the inner side, and a straight segment (63) connecting the first arc segment (61) and the second arc segment (62). The relationship between the radius R1 of the first arc segment (61) and the radius R2 of the second arc segment (62) satisfies 2*R2≤R1≤3*R2.

5. The rotor structure according to claim 1, characterized in that, 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 on the radially outer side, a second arc segment (62) located on the radially inner side, and a straight segment (63) connecting the first arc segment (61) and the second arc segment (62). The relationship between the width H5 of the rotor slot (21) and the radius R1 of the first arc segment (61) satisfies 0.2*R1≤H5≤0.5*R1.

6. The rotor structure according to claim 1, characterized in that, A rotor tooth (22) and a rotor tooth shoe (8) are formed between two adjacent conductor slots (6). The minimum width of the rotor tooth (22) is H8, and the maximum width of the rotor tooth shoe (8) is H9, where 0.15*H9≤H8≤0.5*H9.

7. The rotor structure according to claim 1, characterized in that, In the same group of rotor slots (21), there is one first slot (9) and two second slots (10), one of which is adjacent to the first slot (9) and the two second slots (10) are adjacent to each other.

8. A single-phase induction motor, characterized in that, The single-phase induction motor adopts a concentrated winding. The single-phase induction motor includes a stator structure and a rotor structure. The stator structure is sleeved outside the rotor structure. The stator structure includes a stator core (1). The rotor structure is the rotor structure of any one of claims 1 to 7.

9. The single-phase induction motor according to claim 8, characterized in that, The maximum width of the air gap formed between the rotor toothed shoe (8) and the stator structure is L3, and the minimum width of the air gap formed between the rotor toothed shoe (8) and the stator structure is L4, where L4 < L3 ≤ 4 * L4.

10. The single-phase induction motor according to claim 8, characterized in that, The stator structure includes a stator tooth shoe (7). In a cross section perpendicular to the central axis of the stator core (1), the angle formed by the line connecting the two ends of the stator tooth shoe (7) in the circumferential direction with the central axis of the stator core (1) is α1, 0.85*360° / Z1≤α1≤360° / Z1, where Z1 is the number of stator teeth. The angle formed by the line connecting the two ends of the rotor tooth shoe (8) in the circumferential direction with the central axis of the rotor core (2) is α2, 0.4*α1≤α2≤0.6*α1.

11. The single-phase induction motor according to claim 8, characterized in that, The stator structure includes a stator toothed shoe (7). The stator toothed shoe (7) includes a toothed shoe arc segment (73) located in the middle and tangent edges (72) located at both ends on the side near the central axis of the stator core (1). The included angle between the two ends of the toothed shoe arc segment (73) and the line connecting the central axis of the stator core (1) is α3. The included angle between the two ends of the stator toothed shoe (7) in the circumferential direction and the line connecting the central axis of the stator core (1) is α1. 0.7*α1≤α3≤0.95*α1.

12. The single-phase induction motor according to claim 8, characterized in that, The stator structure includes a stator toothed shoe (7). In a cross section perpendicular to the central axis of the stator core (1), the stator toothed shoe (7) near the central axis of the stator core (1) includes a toothed shoe arc segment (73) in the middle and tangent edges (72) at both ends. The distance between the two ends of the toothed shoe arc segment (73) is H2, and the maximum distance between the endpoints of the two circumferential ends of the stator toothed shoe (7) is H1, where 0.6*H1≤H2<H1.

13. The single-phase induction motor according to claim 8, characterized in that, The stator structure includes stator tooth shoes (7), and stator slots (12) are formed between adjacent stator tooth shoes (7). In a cross section perpendicular to the central axis of the stator core (1), the side of the stator tooth shoe (7) near the central axis of the stator core (1) includes a tooth shoe arc segment (73) located in the middle and tangent edges (72) located at both ends. The maximum depth of the tangent edges (72) along the radial direction of the stator core (1) is L2, and the total depth of the stator slots (12) along the radial direction of the stator core (1) is L1, 0.3*L1≤L2≤0.6*L1.

14. The single-phase induction motor according to claim 8, characterized in that, The stator structure includes a stator tooth shoe (7) and a stator tooth (4). In a cross section perpendicular to the central axis of the stator core (1), the angle formed between the inclined side (71) of the stator tooth shoe (7) away from the central axis of the stator core (1) and the side of the adjacent stator tooth (4) is α4, 100°≤α4≤130°.

15. The single-phase induction motor according to claim 14, characterized in that, 110°≤α4≤120°。 16. The single-phase induction motor according to claim 8, characterized in that, The stator structure includes stator teeth (7), and stator slots (12) are formed between adjacent stator teeth (7). In a cross section perpendicular to the central axis of the stator core (1), the maximum width of the stator slot (12) is H3, and the width of the rotor slot (21) is H5, where 2*H5≤H3≤3*H5.

17. The single-phase induction motor according to claim 8, characterized in that, The stator structure includes stator tooth shoes (7), and stator slots (12) are formed between adjacent stator tooth shoes (7). In a cross section perpendicular to the central axis of the stator core (1), the side of the stator tooth shoe (7) near the central axis of the stator core (1) includes a tooth shoe arc segment (73) located in the middle and tangent edges (72) located at both ends. The maximum width of the stator slot (12) is H3. The distance between the endpoints of the adjacent tangent edges (72) of two adjacent stator tooth shoes (7) at the end away from the stator slot (12) is H4, and 1.5*H3≤H4≤3*H3.

18. The single-phase induction motor according to claim 17, characterized in that, 2*H3≤H4≤2.5*H3.

19. The single-phase induction motor according to claim 8, characterized in that, The stator structure includes a stator tooth shoe (7) and a stator tooth (4). In a cross section perpendicular to the central axis of the stator core (1), the maximum distance between the endpoints of the two circumferential ends of the stator tooth shoe (7) is H1, and the width of the stator tooth (4) is H6, 0.4*H1≤H6≤0.7*H1.

20. The single-phase induction motor according to claim 8, characterized in that, The stator structure includes a stator tooth (4) and a yoke (11). In a cross section perpendicular to the central axis of the stator core (1), the width of the stator tooth (4) is H6 and the width of the yoke (11) is H7, where H7≤H6≤1.5*H7.

21. The single-phase induction motor according to claim 8, characterized in that, The stator structure includes a stator tooth section (4), on which a main phase winding and a secondary phase winding are wound respectively. The main phase winding and the secondary phase winding are wound alternately in sequence. The winding directions of the main phase winding and the secondary phase winding are different. The relationship between the number of turns N1 of the main phase winding and the number of turns N2 of the secondary phase winding satisfies 0.85*N1≤N2≤0.95*N1.

22. The single-phase induction motor according to claim 8, characterized in that, The stator core (1) includes stator laminations (3), stator laminations (3) include stator teeth (4) and yokes (11), stator laminations (3) include a chain structure composed of 8 stator teeth (4), the chain structure is connected end to end by the yokes (11) to form an octagonal outer contour, the stator core (1) includes a stator groove (13) surrounded by the stator teeth (4) and the yokes (11), the side of the stator teeth (4) forming the stator groove (13) is perpendicular to the side of the yokes (11).

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