Single-phase concentrated winding induction motor

Abstract

This invention provides a single-phase concentrated winding induction motor. The single-phase concentrated winding induction motor includes a stator core and a rotor core. The stator core is disposed on the outer periphery of the rotor core, forming an air gap with the rotor core. The stator core includes multiple stator teeth and stator tooth shoes. The rotor core includes multiple conductor slots, with rotor teeth and rotor tooth shoes formed between adjacent conductor slots. In a cross-section perpendicular to the central axis of the rotor core, the angle formed by the lines connecting the circumferential endpoints of the stator tooth shoes to the central axis of the rotor core is α1, where 0.8×360° / Z1≤α1≤360° / Z1, and Z1 is the number of stator slots. The maximum angle formed by the lines connecting the circumferential endpoints of the rotor tooth shoes to the central axis of the rotor core is α2, where 0.4×α1≤α2≤0.6×α1. The single-phase concentrated winding induction motor of this invention can reduce leakage flux, decrease torque ripple, and improve the motor's output capacity.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically, to a single-phase concentrated winding induction motor. Background Technology

[0002] Currently, single-phase induction motors with single-phase concentrated windings have high winding utilization, fewer slots, and shorter winding time, which can effectively reduce the amount of copper used in the windings and have low manufacturing costs. Therefore, they are widely used in various fields such as air conditioners and home appliances. However, concentrated windings have fewer stator slots, lower stator tooth harmonic orders, and larger harmonic amplitudes. These low-order harmonics can cause low-order electromagnetic forces in the motor, which can easily lead to vibration and noise problems. Summary of the Invention

[0003] The main objective of this invention is to provide a single-phase concentrated winding induction motor that can reduce leakage flux, lower torque ripple, and improve the motor's output capability.

[0004] To achieve the above objectives, according to one aspect of the present invention, a single-phase concentrated winding induction motor is provided, comprising a stator core and a rotor core. The stator core is disposed on the outer periphery of the rotor core and forms an air gap with the rotor core. The stator core includes a plurality of stator teeth and stator tooth shoes. The rotor core includes a plurality of conductor slots, with rotor teeth and rotor tooth shoes formed between adjacent conductor slots. In a cross section perpendicular to the central axis of the rotor core, the angle formed by the lines connecting the two circumferential endpoints of the stator tooth shoes to the central axis of the rotor core is α1, where 0.8×360° / Z1≤α1≤360° / Z1, and Z1 is the number of stator slots. The maximum angle formed by the lines connecting the two circumferential endpoints of the rotor tooth shoes to the central axis of the rotor core is α2, where 0.4×α1≤α2≤0.6×α1.

[0005] Furthermore, the side of the stator tooth shoe closest to the central axis of the rotor core includes a tooth shoe arc segment in the middle and tangent edges at both ends. The angle between the two ends of the tooth shoe arc segment and the line connecting the central axis of the rotor core is α3, where 0.7×α1≤α3≤0.95×α1.

[0006] Furthermore, in a cross section perpendicular to the central axis of the rotor core, the stator tooth shoe on the side closest to the central axis of the rotor core includes a tooth shoe arc segment in the middle and tangent edges at both ends. The distance between the two ends of the tooth shoe arc segment is H2, and the maximum distance between the endpoints of the two circumferential ends of the stator tooth shoe is H1, where 0.6×H1≤H2

[0007] ​Furthermore, stator slots are formed between adjacent stator teeth. In a cross-section perpendicular to the central axis of the rotor core, the side of the stator teeth closest to the central axis of the rotor core includes a tooth arc segment in the middle and tangents at both ends. The maximum depth of the tangents along the radial direction of the stator core is L2, and the total depth of the stator slots along the radial direction of the stator core is L1, where 0.3×L1≤L2≤0.6×L1.

[0008] Furthermore, in a cross section perpendicular to the central axis of the rotor core, the angle formed between the inclined side of the stator tooth shoe on the side away from the central axis of the rotor core and the side of the adjacent stator tooth is α4, where 100°≤α4≤130°.

[0009] Furthermore, 110°≤α4≤120°.

[0010] Furthermore, stator slots are formed between adjacent stator teeth, and rotor slots are provided on the radially outer side of the conductor slots. In a cross section perpendicular to the central axis of the rotor core, the maximum width of the stator slot is H3, and the width of the rotor slot is H5, where 2×H5≤H3≤3×H5.

[0011] Furthermore, stator slots are formed between adjacent stator teeth. In a cross-section perpendicular to the central axis of the rotor core, the side of the stator teeth closest to the central axis of the rotor core includes a tooth arc segment in the middle and tangents at both ends. The maximum width of the stator slot is H3, and the distance between the endpoints of adjacent tangents of two adjacent stator teeth away from the stator slot is H4, where 1.5×H3≤H4≤3×H3.

[0012] Furthermore, 2×H3≤H4≤2.5×H3.

[0013] Furthermore, in a section perpendicular to the central axis of the rotor core, the maximum distance between the two ends of the stator tooth shoe in the circumferential direction is H1, and the width of the stator tooth is H6, 0.4×H1≤H6≤0.7×H1.

[0014] Furthermore, the stator core includes a yoke. In a cross-section perpendicular to the central axis of the rotor core, the width of the stator teeth is H6, and the width of the yoke is H7, where H7≤H6≤1.5×H7.

[0015] Furthermore, the stator teeth are wound with a main phase winding and a secondary phase winding, which 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.

[0016] Furthermore, the stator core includes stator laminations, stator laminations include stator teeth and yokes, stator laminations include a chain structure composed of 8 stator teeth, the chain structure is connected end to end by the yokes to form an octagonal outer contour, the stator core includes stator tooth grooves formed by stator teeth and yokes, the side of the stator teeth forming the stator tooth grooves is perpendicular to the side of the yokes.

[0017] Furthermore, the rotor core includes multiple rotor laminations stacked axially. The conductor slot on the rotor lamination at the first end rotates about the central axis of the rotor core by an angle θ relative to the same conductor slot on the rotor lamination at the second end, where 360° / Z2≤θ≤360° / Z1, Z1 is the number of stator slots, and Z2 is the number of conductor slots.

[0018] Furthermore, within a cross-section perpendicular to the central axis of the rotor core, the rotor core is divided into four annular regions—a first region, a second region, a third region, and a fourth region—with the central axis as the center and along the direction from the outer circle of the rotor to the shaft hole. A rotor slot extending to the outer circle of the rotor is provided on the radially outer side of the conductor slot. The rotor slot is located in the first region, the conductor slot is located in the second region, the interval between the shaft hole and the conductor slot is the third region, and the shaft hole is located in the fourth region. Along the direction close to the shaft hole, the circumferential width of the conductor slot decreases, and the small end of the conductor slot points towards the shaft hole.

[0019] Furthermore, the diameter of the circle containing the inner radial end of the rotor slot is D2, and the diameter of the circle containing the outer radial end of the rotor slot is D1, where 0.965×D1≤D2<D1.

[0020] Furthermore, the diameter of the circle containing the radial outer end of the rotor slot is D1, and the diameter of the circle containing the radial inner end of the conductor slot is D3, where 0.45×D1≤D3≤0.6D1.

[0021] Furthermore, in a cross section perpendicular to the central axis of the rotor core, the conductor slot includes a first arc segment located radially outward, a second arc segment located radially inward, and a straight segment connecting the first and second arc segments. The radius of the first arc segment is R1, and the total radial length of the conductor slot is L3, where 0.15×L3≤R1≤0.25×L3.

[0022] Furthermore, the conductor groove includes a first arc segment located on the outer radial side, a second arc segment located on the inner radial side, and a straight line segment connecting 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.

[0023] Furthermore, in a cross-section perpendicular to the central axis of the rotor core, the conductor slot includes a first arc segment located radially outward, a second arc segment located radially inward, and a straight line segment connecting the first and second arc segments. The conductor slot is symmetrical about the axis of symmetry formed by the line connecting the centers of the first and second arc segments. The angle between the straight line segment and the axis of symmetry is α5, where 0.4×360° / Z2≤α5≤0.6×360° / Z2, and Z2 is the number of conductor slots on the rotor core.

[0024] Furthermore, in a cross section perpendicular to the central axis of the rotor core, the conductor slot includes a first arc segment located radially outward, a second arc segment located radially inward, and a straight segment connecting the first and second arc segments. The width of the rotor slot is H5, the radius of the first arc segment is R1, and 0.2×R1≤H5≤0.5R1.

[0025] Furthermore, the rotor tooth shoe is located radially outside the rotor tooth, and a rotor slot is formed between adjacent rotor tooth shoes. In a section perpendicular to the central axis of the rotor core, the minimum width of the rotor tooth is H8, and the maximum width of the rotor tooth shoe is H9, with 0.25×H9≤H8≤0.5×H9.

[0026] According to the technical solution of this invention, a single-phase concentrated winding induction motor includes a stator core and a rotor core. The stator core is disposed on the outer periphery of the rotor core and forms an air gap with the rotor core. The stator core includes multiple stator teeth and stator tooth shoes. The rotor core includes multiple conductor slots. Rotor teeth and rotor tooth shoes are formed between adjacent conductor slots. In a cross section perpendicular to the central axis of the rotor core, the angle formed by the lines connecting the two circumferential endpoints of the stator tooth shoes and the central axis of the rotor core is α1, 0.8×360° / Z1≤α1≤360° / Z1, where Z1 is the number of stator slots. The maximum angle formed by the lines connecting the two circumferential endpoints of the rotor tooth shoes and the central axis of the rotor core is α2, 0.4×α1≤α2≤0.6×α1. This single-phase concentrated winding induction motor limits the relationship between the included angle of the stator tooth shoe and the maximum included angle of the rotor tooth shoe, which can ensure the smooth magnetic circuit of the single-phase concentrated winding induction motor, reduce leakage flux, reduce torque pulsation, and improve the efficiency and output capacity of the motor; at the same time, it can make reasonable use of the stator and rotor space, weaken tooth harmonics, and reduce motor vibration noise. Attached Figure Description

[0027] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0028] Figure 1A schematic diagram of the structure of a single-phase concentrated winding induction motor according to an embodiment of the present invention is shown;

[0029] Figure 2 A schematic diagram of the stator structure according to an embodiment of the present invention is shown;

[0030] Figure 3 A schematic diagram of the rotor structure according to an embodiment of the present invention is shown;

[0031] Figure 4 A schematic diagram of the inclined slot structure of the rotor core according to an embodiment of the present invention is shown;

[0032] Figure 5 The graph showing the relationship between α2 / α1 and torque pulsation for a single-phase concentrated winding induction motor according to an embodiment of the present invention is shown.

[0033] Figure 6 The graph showing the relationship between H3 / H5 and additional torque for a single-phase concentrated winding induction motor according to an embodiment of the present invention is shown.

[0034] Figure 7 The graph showing the relationship between N2 / N1 and the amplitude of the third tooth harmonic of a single-phase concentrated winding induction motor according to an embodiment of the present invention is shown.

[0035] Figure 8 A comparison diagram of the speed-torque relationship between a single-phase concentrated winding induction motor according to an embodiment of the present invention and a single-phase concentrated winding induction motor of related technologies is shown; and

[0036] Figure 9 A comparison diagram of torque curves of a single-phase concentrated winding induction motor according to an embodiment of the present invention and a single-phase concentrated winding induction motor of related technologies is shown.

[0037] The above figures include the following reference numerals:

[0038] 1. Stator core; 11. Yoke; 12. Stator slot; 13. Stator tooth slot; 2. Rotor core; 21. Rotor slot; 22. Rotor tooth; 3. Stator lamination; 4. Stator tooth; 5. Rotor lamination; 6. Conductor slot; 61. First arc segment; 62. Second arc segment; 63. Straight segment; 7. Stator tooth shoe; 71. Inclined edge; 72. Cut edge; 73. Tooth shoe arc segment; 8. Rotor tooth shoe. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] See also Figures 1 to 9As shown, according to an embodiment of the present invention, a single-phase concentrated winding induction motor includes a stator core 1 and a rotor core 2. The stator core 1 is disposed on the outer periphery of the rotor core 2 and forms an air gap with the rotor core 2. The stator core 1 includes multiple stator teeth 4 and stator tooth shoes 7. The rotor core 2 includes multiple conductor slots 6. Rotor teeth 22 and rotor tooth shoes 8 are formed between adjacent conductor slots 6. In a cross section perpendicular to the central axis of the rotor core 2, the angle formed by the lines connecting the two circumferential endpoints of the stator tooth shoes 7 and the central axis of the rotor core 2 is α1, where 0.8×360° / Z1≤α1≤360° / Z1, and Z1 is the number of stator slots. The maximum angle formed by the lines connecting the two circumferential endpoints of the rotor tooth shoes 8 and the central axis of the rotor core 2 is α2, where 0.4×α1≤α2≤0.6×α1. The conductor slots 6 are filled with a conductive but non-magnetic material.

[0041] This single-phase concentrated winding induction motor defines the relationship between the included angle of the stator tooth shoe 7 and the maximum included angle of the rotor tooth shoe 8. These angle constraints primarily limit the magnetic circuit size at the locations of the stator tooth shoe 7 and rotor tooth shoe 8. A larger angle results in a wider magnetic circuit, while a smaller angle results in a narrower magnetic circuit. Ensuring a suitable magnetic circuit size reduces magnetic leakage and improves motor efficiency. By limiting the relationship between α1 and α2 within the aforementioned range, the magnetic circuit of the single-phase concentrated winding induction motor can be kept unobstructed, reducing magnetic leakage, lowering torque ripple, and improving motor efficiency and output capacity. Simultaneously, it allows for efficient use of the stator and rotor space, weakening tooth harmonics and reducing motor vibration and noise.

[0042] See also Figure 5 The figure shows the relationship curve between α2 / α1 and torque pulsation of a single-phase concentrated winding induction motor according to an embodiment of the present invention. Under the same operating conditions, when the included angle α1 formed by the line connecting the two ends of the stator tooth shoe 7 in the circumferential direction and the central axis of the rotor core 2 and the maximum included angle α2 formed by the line connecting the two ends of the rotor tooth shoe 8 in the circumferential direction and the central axis of the rotor core 2 satisfy 0.4×α1≤α2≤0.6×α1, the torque pulsation value of the single-phase concentrated winding induction motor is small, which can reduce torque pulsation, reduce the main vibration peak, and reduce motor vibration noise.

[0043] In one embodiment, the conductive but non-magnetic material is aluminum or copper, etc.

[0044] In one embodiment, the stator core 1 includes stator laminations 3, and the stator core 1 is formed by stacking a plurality of stator laminations 3 along the axial direction.

[0045] In one embodiment, the rotor core 2 includes rotor laminations 5, and the rotor core 2 is formed by stacking a plurality of rotor laminations 5 axially.

[0046] In one embodiment, the stator toothed shoe 7 near the central axis of the rotor core 2 includes a toothed shoe arc segment 73 in the middle and tangent edges 72 at both ends. The angle between the two ends of the toothed shoe arc segment 73 and the line connecting the central axis of the rotor core 2 is α3, and the angle formed by the line connecting the two circumferential endpoints of the stator toothed shoe 7 and the line connecting the central axis of the rotor core 2 is α1, where 0.7×α1≤α3≤0.95×α1.

[0047] By setting tangents 72 at both ends of the stator tooth shoe 7, the positional relationship between the rotor magnetic channel and the stator tooth slot can be changed, which can effectively reduce the cogging effect and reduce current harmonics.

[0048] In one embodiment, in a cross section perpendicular to the central axis of the rotor core 2, the stator tooth shoe 7 on the side near the central axis of the rotor core 2 includes a tooth shoe arc segment 73 located in the middle and tangent edges 72 located at both ends. The distance between the two ends of the tooth shoe arc segment 73 is H2, and the maximum distance between the endpoints of the two circumferential ends of the stator tooth shoe 7 is H1, where 0.6×H1≤H2

[0049] Limiting the width of the stator tooth shoe 7 can, on the one hand, change the magnetic circuit of the stator tooth shoe section and reduce magnetic leakage, and on the other hand, ensure the mechanical strength of the stator tooth shoe section and prevent deformation of the stator tooth shoe section.

[0050] In one embodiment, stator slots 12 are formed between adjacent stator shoe 7. In a cross section perpendicular to the central axis of the rotor core 2, the side of the stator shoe 7 near the central axis of the rotor core 2 includes a middle shoe arc segment 73 and tangent edges 72 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, where 0.3×L1≤L2≤0.6×L1.

[0051] By defining the relationship between the radial depth of the tangent 72 and the radial depth of the stator slot 12, deformation of the stator tooth shoe can be prevented while ensuring the smooth flow of the stator magnetic circuit.

[0052] In one embodiment, the stator structure includes a stator shoe 7 and a stator tooth 4. In a cross section perpendicular to the central axis of the rotor core 2, the angle formed between the inclined side 71 of the stator shoe 7 away from the central axis of the rotor core 2 and the side of the adjacent stator tooth 4 is α4, where 100°≤α4≤130°.

[0053] In one embodiment, 110°≤α4≤120°.

[0054] ​By limiting the above, a certain stator slot area can be guaranteed, which not only provides reasonable arrangement space for the main and auxiliary phase windings, weakens harmonics, and reduces motor vibration and noise, but also preserves a reasonable stator magnetic circuit for magnetic flux, avoiding stator magnetic field saturation.

[0055] In one embodiment, 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 rotor core 2, 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.

[0056] By limiting the relationship between the width of the stator slot 12 and the width of the rotor slot 21, it is possible to increase the tooth harmonic number, reduce the tooth harmonic amplitude, weaken the asynchronous additional torque, and improve the motor starting capability.

[0057] See also Figure 6 The figure shows the relationship between the ratio H3 / H5 of the stator slot 12 width to the rotor slot 21 width of the single-phase concentrated winding induction motor according to an embodiment of the present invention and the additional torque. Under the same working condition, when the relationship between the maximum width H3 of the stator slot 12 and the width H5 of the rotor slot 21 satisfies 2×H5≤H3≤3×H5, the additional torque of the single-phase concentrated winding induction motor is at a low level and the value of the additional torque increases slowly, which can reduce the additional torque of the single-phase concentrated winding induction motor and make the motor easier to start.

[0058] In one embodiment, 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 rotor core 2, the side of the stator tooth shoe 7 near the central axis of the rotor core 2 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, and the distance between the endpoints of adjacent tangent edges 72 of two adjacent stator tooth shoes 7 at the end away from the stator slot 12 is H4, where 1.5×H3≤H4≤3×H3.

[0059] In one embodiment, 2×H3≤H4≤2.5×H3.

[0060] By limiting the width of the stator slot 12 formed by the tangent edge 72 of the stator tooth shoe 7, the tooth harmonic number can be increased, the tooth harmonic amplitude can be reduced, the problem of the starting torque dip of the single-phase concentrated winding induction motor can be improved, and the starting capability of the single-phase concentrated winding induction motor can be enhanced.

[0061] In one embodiment, the stator structure includes stator tooth shoe 7 and stator tooth portion 4. In a cross section perpendicular to the central axis of the rotor core 2, 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 portion 4 is H6, where 0.4×H1≤H6≤0.7×H1.

[0062] By limiting the dimensional relationship between the stator tooth shoe 7 and the stator tooth 4, it is possible to make it easy for magnetic lines of force to enter the stator core 1, and the magnetic circuit of the stator core 1 is not easily saturated.

[0063] In one embodiment, the stator structure includes stator teeth 4 and yoke 11. In a cross section perpendicular to the central axis of the rotor core 2, the width of stator teeth 4 is H6 and the width of yoke 11 is H7, where H7≤H6≤1.5×H7.

[0064] By limiting the relationship between the width of the stator teeth and the width of the yoke, the stator space can be used rationally, ensuring the smooth flow of magnetic flux in the stator while avoiding magnetic field saturation.

[0065] In one embodiment, 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.

[0066] By setting a reasonable number of turns for the main and auxiliary phases, tooth harmonics can be weakened, noise and harmonic losses can be reduced, and motor efficiency can be improved.

[0067] See also Figure 7 The figure shows the relationship between the ratio N2 / N1 of the number of turns N2 of the secondary phase winding and the number of turns N1 of the primary phase winding in a single-phase concentrated winding induction motor according to an embodiment of the present invention and the amplitude of the third tooth harmonic. Under the same operating conditions, when the number of turns N1 of the primary phase winding and the number of turns N2 of the secondary phase winding satisfy 0.85×N1≤N2≤0.95×N1, the amplitude of the third tooth harmonic of the single-phase concentrated winding induction motor is at a low level, which can weaken the tooth harmonic amplitude and reduce the vibration noise of the motor.

[0068] In one embodiment, 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 tooth groove 13 surrounded by stator teeth 4 and yokes 11, the side of the stator teeth 4 forming the stator tooth groove 13 is perpendicular to the side of the yokes 11.

[0069] In one embodiment, the rotor core 2 includes a plurality of rotor laminations 5 stacked axially. The conductor slot 6 on the rotor lamination 5 at the first end rotates about the central axis of the rotor core 2 by an angle θ relative to the same conductor slot 6 on the rotor lamination 5 at the second end, where 360° / Z2≤θ≤360° / Z1, Z1 is the number of stator slots, and Z2 is the number of conductor slots.

[0070] By setting a reasonable conductor slot angle, rotor tooth harmonics can be effectively reduced.

[0071] In this embodiment, the conductor slot 6 on the rotor lamination 5 at the first end and the same conductor slot 6 on the rotor lamination 5 at the second end mean that the conductor slot 6 on the rotor lamination 5 at the first end and the same conductor slot 6 on the rotor lamination 5 at the second end are interconnected in the axial direction before being filled with conductive and non-magnetic material. The rotation angle θ between the two conductor slots 6 represents the skew angle of the conductor slot of the rotor core.

[0072] In one embodiment, within a cross-section perpendicular to the central axis of the rotor core 2, the rotor core 2 is divided into four annular regions—a first region, a second region, a third region, and a fourth region—with the central axis as the center and along the direction from the outer circle of the rotor to the shaft hole. A rotor slot 21 extending to the outer circle of the rotor is provided on the radially outer side of the conductor slot 6. The rotor slot 21 is located in the first region, the conductor slot 6 is located in the second region, the interval between the shaft hole and the conductor slot 6 is the third region, and the shaft hole is located in the fourth region. Along the direction close to the shaft hole, the circumferential width of the conductor slot 6 decreases, and the small end of the conductor slot 6 points towards the shaft hole.

[0073] The division of different areas ensures the normal starting and operation of the motor and the mechanical strength of the rotor; the conductor slot 6 helps the motor to start and run. The conductor slots are evenly distributed and the small end points to the shaft hole, which can reduce the influence of the conductor slot 6 on the magnetic circuit and ensure the motor output.

[0074] In one embodiment, in a cross section perpendicular to the central axis of the rotor core 2, the rotor core 2 has a rotor slot 21 on the radially outer side of the conductor slot 6. The rotor slot 21 extends 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 radially inner end of the rotor slot 21 is located is D2, and the diameter of the circle where the radially outer end of the rotor slot 21 is located is D1, where 0.965×D1≤D2<D1.

[0075] This design ensures a certain rotor slot depth, reducing rotor tooth harmonics while maintaining the rotor's mechanical strength.

[0076] In one embodiment, in a cross section perpendicular to the central axis of the rotor core 2, the rotor core 2 has 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 radially outer end of the rotor slot 21 is located is D1, and the diameter of the circle where the radially inner end of the conductor slot 6 is located is D3, where 0.45×D1≤D3≤0.6D1.

[0077] This configuration makes full use of the rotor space, filling the conductor slot 6 with sufficient conductive and non-magnetic material to improve the motor's starting capability.

[0078] In one embodiment, within a cross-section perpendicular to the central axis of the rotor core 2, the conductor groove 6 includes a first arc segment 61 located radially outward, a second arc segment 62 located radially inward, and a straight segment 63 connecting the first arc segment 61 and the second arc segment 62. The radius of the first arc segment 61 is R1, and the total radial length of the conductor groove 6 is L3, where 0.15×L3≤R1≤0.25×L3.

[0079] This configuration allows for full utilization of the rotor space to accommodate conductor slots 6, improving the motor's starting capability while ensuring the rotor's magnetic field circuit and enhancing the motor's output capability.

[0080] In one embodiment, within 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 segment 63 connecting 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.

[0081] This design avoids the magnetic channel width between the bottom arc of the conductor slot 6 near the outer circle of the rotor being too large or too small, which would affect the saturation of the rotor magnetic circuit.

[0082] In one embodiment, each conductor slot is a symmetrical structure about a radial line. 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 connecting the first arc segment 61 and the second arc segment 62. The conductor slot 6 is symmetrical about the axis of symmetry formed by the line connecting the centers of the first arc segment 61 and the second arc segment 62. The angle between the straight line segment 63 and the axis of symmetry is α5, where 0.4×360° / Z2≤α5≤0.6×360° / Z2, and Z2 is the number of conductor slots 6 on the rotor core 2.

[0083] This arrangement is to ensure that there is sufficient magnetic width between the conductor slots 6, so as to avoid magnetic field saturation and affect the magnetic flux flow in the channels between the conductor slots 6.

[0084] In one embodiment, within a cross section perpendicular to the central axis of the rotor core 2, the rotor core 2 has a rotor slot 21 formed on the radially outer side of the conductor slot 6. 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 width of the rotor slot 21 is H5, and the radius of the first arc segment 61 is R1, where 0.2×R1≤H5≤0.5R1.

[0085] This configuration limits the rotor slot width, increases the tooth harmonic order, reduces the tooth harmonic amplitude, weakens the asynchronous additional torque, and improves the starting capability of a single-phase concentrated winding induction motor.

[0086] In one embodiment, rotor teeth 22 and rotor tooth shoes 8 are formed between adjacent conductor slots 6. The conductor slots 6 are filled with conductive but non-magnetic material. The rotor tooth shoes 8 are located radially outside the rotor teeth 22. Rotor slots 21 are formed between adjacent rotor tooth shoes 8. In a cross section perpendicular to the central axis of the rotor core 2, the minimum width of the rotor teeth 22 is H8, and the maximum width of the rotor tooth shoes 8 is H9, where 0.25×H9≤H8≤0.5×H9.

[0087] This configuration ensures sufficient rotor magnetic circuit space, reduces rotor saturation, and improves motor efficiency.

[0088] See also Figure 8 and Figure 9 The figure shows a comparison of the speed-torque relationship and torque curve of a single-phase concentrated winding induction motor according to an embodiment of the present invention and a single-phase concentrated winding induction motor of related technologies. Compared with the single-phase concentrated winding induction motor of related technologies, the single-phase concentrated winding induction motor of the present invention has a smoother torque change in the low-speed stage, which improves the asynchronous additional torque of the single-phase concentrated winding induction motor, has stronger starting capability, and smaller torque fluctuation, which can improve motor harmonics and reduce motor vibration noise.

[0089] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0090] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0091] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A single-phase concentrated winding induction motor, characterized in that, The rotor core (2) comprises a stator core (1) and a rotor core (2). The stator core (1) is disposed on the outer periphery of the rotor core (2) and forms an air gap with the rotor core (2). The stator core (1) includes multiple stator teeth (4) and stator tooth shoes (7). The rotor core (2) includes multiple conductor slots (6). Rotor teeth (22) and rotor tooth shoes (8) are formed between adjacent conductor slots (6). In a cross section perpendicular to the central axis of the rotor core (2), the angle formed by the lines connecting the two circumferential endpoints of the stator tooth shoes (7) and the central axis of the rotor core (2) is α1. , 0.8×360° / Z1≤α1≤360° / Z1, Z1 is the number of stator slots, the maximum included angle formed by the line connecting the endpoints of the rotor tooth shoe (8) at both ends in the circumferential direction and the central axis of the rotor core (2) is α2, 0.4×α1≤α2≤0.6×α1; the side of the stator tooth shoe (7) near the central axis of the rotor core (2) includes a tooth shoe arc segment (73) in the middle and a tangent edge (72) at both ends, the included angle between the two ends of the tooth shoe arc segment (73) and the line connecting the central axis of the rotor core (2) is α3, 0.7×α1≤α3≤0.95×α1.

2. The single-phase concentrated winding induction motor according to claim 1, characterized in that, In a cross section perpendicular to the central axis of the rotor core (2), the stator tooth shoe (7) on the side near the central axis of the rotor core (2) includes a tooth shoe arc segment (73) in the middle and tangent edges (72) at both ends. The distance between the two ends of the tooth shoe arc segment (73) is H2, and the maximum distance between the endpoints of the two circumferential ends of the stator tooth shoe (7) is H1, 0.6×H1≤H2<H1.

3. The single-phase concentrated winding induction motor according to claim 1, characterized in that, Stator slots (12) are formed between adjacent stator shoe (7). In a cross section perpendicular to the central axis of the rotor core (2), the side of the stator shoe (7) near the central axis of the rotor core (2) includes a middle shoe arc segment (73) and tangents (72) at both ends. The maximum depth of the tangents (72) along the radial direction of the stator core (1) is L2. 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.

4. The single-phase concentrated winding induction motor according to claim 1, characterized in that, In a cross section perpendicular to the central axis of the rotor core (2), the angle formed between the inclined side (71) of the stator tooth shoe (7) away from the central axis of the rotor core (2) and the side of the adjacent stator tooth (4) is α4, 100°≤α4≤130°.

5. The single-phase concentrated winding induction motor according to claim 4, characterized in that, 110°≤α4≤120°。 6. The single-phase concentrated winding induction motor according to claim 1, characterized in that, Stator slots (12) are formed between adjacent stator tooth shoes (7), and rotor slots (21) are provided on the radial outer side of the conductor slots (6). In the cross section perpendicular to the central axis of the rotor core (2), the maximum width of the stator slots (12) is H3, and the width of the rotor slots (21) is H5, 2×H5≤H3≤3×H5.

7. The single-phase concentrated winding induction motor according to claim 1, characterized in that, Stator slots (12) are formed between adjacent stator tooth shoes (7). In a cross section perpendicular to the central axis of the rotor core (2), the side of the stator tooth shoe (7) near the central axis of the rotor core (2) includes a tooth shoe arc segment (73) in the middle and tangent edges (72) 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, 1.5×H3≤H4≤3×H3.

8. The single-phase concentrated winding induction motor according to claim 7, characterized in that, 2×H3≤H4≤2.5×H3.

9. The single-phase concentrated winding induction motor according to claim 1, characterized in that, In a cross section perpendicular to the central axis of the rotor core (2), 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.

10. The single-phase concentrated winding induction motor according to claim 1, characterized in that, The stator core (1) includes a yoke (11). In a cross section perpendicular to the central axis of the rotor core (2), the width of the stator tooth (4) is H6, and the width of the yoke (11) is H7, where H7≤H6≤1.5×H7.

11. The single-phase concentrated winding induction motor according to claim 1, characterized in that, The stator teeth (4) are respectively wound with a main phase winding and a secondary phase winding. 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.

12. The single-phase concentrated winding induction motor according to claim 1, 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 tooth groove (13) surrounded by the stator teeth (4) and the yokes (11), the side of the stator teeth (4) forming the stator tooth groove (13) is perpendicular to the side of the yokes (11).

13. The single-phase concentrated winding induction motor according to claim 1, characterized in that, The rotor core (2) includes a plurality of rotor laminations (5) stacked axially. The conductor slot (6) on the rotor lamination (5) at the first end rotates about the central axis of the rotor core (2) by an angle θ relative to the same conductor slot (6) on the rotor lamination (5) at the second end, 360° / Z2≤θ≤360° / Z1, where Z1 is the number of stator slots and Z2 is the number of conductor slots.

14. The single-phase concentrated winding induction motor according to claim 1, characterized in that, In a cross section perpendicular to the central axis of the rotor core (2), the rotor core (2) is divided into four annular regions along the direction from the outer circle of the rotor to the shaft hole, with the central axis as the center. The conductor groove (6) is provided with a rotor slot (21) extending to the outer circle of the rotor on its radially outer side. The rotor slot (21) is located in the first region, the conductor groove (6) is located in the second region, the interval between the shaft hole and the conductor groove (6) is the third region, and the shaft hole is located in the fourth region. Along the direction close to the shaft hole, the circumferential width of the conductor groove (6) decreases, and the small end of the conductor groove (6) points to the shaft hole.

15. The single-phase concentrated winding induction motor according to claim 14, characterized in that, The diameter of the circle containing the inner radial end of the rotor slot (21) is D2, and the diameter of the circle containing the outer radial end of the rotor slot (21) is D1, 0.965×D1≤D2<D1.

16. The single-phase concentrated winding induction motor according to claim 14, characterized in that, The diameter of the circle containing the radial outer end of the rotor slot (21) is D1, and the diameter of the circle containing the radial inner end of the conductor slot (6) is D3, 0.45×D1≤D3≤0.6D1.

17. The single-phase concentrated winding induction motor according to claim 14, 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 radius of the first arc segment (61) is R1, and the total radial length of the conductor groove (6) is L3, where 0.15×L3≤R1≤0.25×L3.

18. The single-phase concentrated winding induction motor according to claim 14, characterized in that, The conductor groove (6) includes a first arc segment (61) located on the outer side of the radial direction, a second arc segment (62) located on the inner side of the radial direction, and a straight line segment (63) connecting 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.

19. The single-phase concentrated winding induction motor according to claim 14, 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 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 conductor slot (6) is symmetrical about the axis of symmetry formed by the line connecting the centers of the first arc segment (61) and the second arc segment (62). The angle between the straight segment (63) and the axis of symmetry is α5, 0.4×360° / Z2≤α5≤0.6×360° / Z2, where Z2 is the number of conductor slots (6) on the rotor core (2).

20. The single-phase concentrated winding induction motor according to claim 14, 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 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 width of the rotor slot (21) is H5, and the radius of the first arc segment (61) is R1, 0.2×R1≤H5≤0.5R1.

21. The single-phase concentrated winding induction motor according to claim 1, characterized in that, The rotor tooth shoe (8) is located on the radial outside of the rotor tooth (22), and a rotor slot (21) is formed between adjacent rotor tooth shoes (8). In a cross section perpendicular to the central axis of the rotor core (2), the minimum width of the rotor tooth (22) is H8, and the maximum width of the rotor tooth shoe (8) is H9, 0.25×H9≤H8≤0.5×H9.

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