Stator structure and motor

Abstract

The utility model provides a stator structure and a motor. The stator structure comprises a stator core and a stator winding, wherein the stator core is formed by stacking a plurality of stator punching sheets; the stator winding consists of a main phase winding and an auxiliary phase winding; the stator punching sheet comprises a stator yoke part which is a first circular ring; the plurality of stator tooth parts are connected with the inner wall surface of the first circular ring and are sequentially arranged at intervals around the center of the first circular ring; the stator comprises a plurality of groups of first stator tooth parts and a plurality of groups of second stator tooth parts, and the plurality of groups of second stator tooth parts are arranged in a plurality of first intervals formed by the plurality of groups of first stator tooth parts in a one-to-one correspondence manner; one of the main phase winding and the auxiliary phase winding is wound on each first stator tooth part, the other one of the main phase winding and the auxiliary phase winding is wound on each second stator tooth part, the winding directions of the phase windings on each first stator tooth part are the same, and the winding directions of the phase windings on each second stator tooth part are the same; the problems that in the prior art, a single-phase induction motor is large in vibration noise and poor in starting capacity due to the fact that a concentrated winding is adopted in a stator are solved.

Description

Technical Field

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

[0002] At present, single-phase concentrated winding asynchronous motors are widely used in various fields such as air conditioners and home appliances. The use of concentrated windings can effectively reduce the amount of copper used in the windings, thereby reducing the production cost of the motor.

[0003] However, the number of slots in the stator using concentrated winding is small, and the low-order harmonics of the stator teeth are large and have a large amplitude, which will cause low-order electromagnetic forces in the motor and easily produce problems such as large vibration noise.

[0004] In addition, the single-phase induction motor has large pulsation and noise, and has a variety of complex harmonic components and obvious asynchronous additional torque, which can easily lead to poor starting ability of the motor, greatly affecting the efficiency and output capacity of the motor. Utility Model Content

[0005] The main purpose of the utility model is to provide a stator structure and a motor to solve the problem that the single-phase induction motor in the prior art easily causes large vibration noise and poor starting ability due to the use of concentrated windings in the stator.

[0006] In order to achieve the above-mentioned purpose, according to the first aspect of the utility model, a stator structure is provided, including a stator core and a stator winding arranged on the stator core, the stator winding includes a plurality of phase windings, the plurality of phase windings include a main phase winding and a secondary phase winding; the stator core is formed by stacking a plurality of stator punching sheets, the stator punching sheets include: a stator yoke, the stator yoke is a first circular ring; a plurality of stator teeth, the plurality of stator teeth are all connected to the inner wall surface of the first circular ring, and the plurality of stator teeth are arranged in sequence around the center of the first circular ring; the plurality of stator teeth include a plurality of groups of first stator teeth and a plurality of groups of second stator teeth. tooth portion, each group of first stator tooth portions includes two first stator tooth portions, each group of second stator tooth portions includes at least one second stator tooth portion, multiple groups of first stator tooth portions are arranged at intervals to form multiple first intervals, and multiple groups of second stator tooth portions are arranged in a one-to-one correspondence in the multiple first intervals; wherein, one of the main phase winding and the auxiliary phase winding is wound on each first stator tooth portion, and the winding direction of the phase winding on each first stator tooth portion is the same; the other of the main phase winding and the auxiliary phase winding is wound on each second stator tooth portion, and the winding direction of the phase winding on each second stator tooth portion is the same.

[0007] Furthermore, the number of stator teeth is N, and the number of poles of the motor where the stator structure is located is 2P; wherein 2*2P<N<5*2P, and N is an integer multiple of P.

[0008] Furthermore, H stator teeth are arranged on the stator punching sheet, the motor in which the stator structure is located includes a rotor, the rotor includes a rotor core formed by stacking a plurality of rotor punching sheets, and M rotor teeth are arranged on the rotor punching sheet; wherein MH≥6, and M is an even number.

[0009] Further, the stator tooth width of the first stator tooth portion is k1, and the stator tooth width of the second stator tooth portion is k2; wherein k1<k2.

[0010] Furthermore, 0.4*k2≤k1≤0.7*k2.

[0011] Further, each stator tooth portion includes a stator tooth shoe; the angle between the two ends of the stator tooth shoe of each first stator tooth portion and the center of the first circular ring is a0; in two adjacent first stator tooth portions, the angle between the line connecting the end of the stator tooth shoe of the first first stator tooth portion away from the second first stator tooth portion and the center of the first circular ring and the angle between the end of the stator tooth shoe of the second first stator tooth portion away from the first first stator tooth portion and the center of the first circular ring is a1; the angle between the two ends of the stator tooth shoe of each second stator tooth portion and the center of the first circular ring is a2; wherein, a1>a2>a0.

[0012] Furthermore, a stator slot is formed between any two adjacent stator teeth; the stator slot between two adjacent first stator teeth is a first stator slot; the stator slot between each second stator tooth and the first stator tooth adjacent thereto is a second stator slot; wherein the first stator slot is a symmetrical structure, and the second stator slot is a symmetrical structure or an asymmetrical structure; the two second stator slots located on opposite sides of each first stator slot and adjacent to the corresponding first stator slot are arranged in plane symmetry with respect to the symmetry center plane of the corresponding first stator slot.

[0013] Furthermore, the minimum width of the slot opening of the first stator slot is m1; the minimum width of the slot opening of the second stator slot is m2; wherein, 0.8*m1≤m2≤1.2*m1.

[0014] Further, the area of ​​the projection of the first stator slot on the first plane perpendicular to the central axis of the stator structure is s1; the area of ​​the projection of the second stator slot on the first plane is s2; wherein s1≤s2.

[0015] Furthermore, s2≤2.5*s1.

[0016] Furthermore, s2≤1.5*s1.

[0017] Further, the maximum depth of the slot opening of the first stator slot is D1, and the maximum depth of the slot opening of the second stator slot is D2, wherein D1≤D2.

[0018] Furthermore, D2≤1.5*D1.

[0019] Furthermore, the number of turns of the main phase winding is N2, and the number of turns of the auxiliary phase winding is N1; wherein, N2<N1.

[0020] Furthermore, 0.1*N1≤N2≤0.4*N1.

[0021] According to the second aspect of the utility model, a motor is provided, comprising: a stator, the stator being the above-mentioned stator structure; a rotor, the rotor comprising a rotor core, the rotor core being formed by stacking a plurality of rotor punchings, an even number of rotor slots being arranged at intervals on the rotor punchings, and the even number of rotor slots being evenly arranged 360 degrees around the center of the rotor punchings.

[0022] Furthermore, the rotor punching includes: a rotor yoke, which is a second circular ring; a plurality of rotor teeth, which are all connected to the outer circumferential surface of the second circular ring and are arranged in sequence around the center of the second circular ring, and a rotor slot is formed between any two adjacent rotor teeth.

[0023] Further, the even number of rotor slots includes a plurality of first rotor slots and a plurality of second rotor slots, the plurality of first rotor slots are arranged at intervals to form a plurality of second intervals, and at least one second rotor slot is arranged in each second interval; wherein, the area of ​​the projection of the first rotor slot on the second plane perpendicular to the central axis of the rotor is s3, and the area of ​​the projection of the second rotor slot on the second plane is s4; wherein, s3>s4.

[0024] Furthermore, the first rotor slot is spaced apart from the outer circumferential surface of the rotor punching, and the minimum distance between the first rotor slot and the outer circumferential surface of the rotor punching is L2; ​​the second rotor slot is connected to the outer circumferential surface of the rotor punching through an opening, and the width of the opening is L1; wherein, L2≤L1.

[0025] Furthermore, L1≤1.8*L2.

[0026] Furthermore, the stator is the stator structure mentioned above; the minimum width of the slot of the second stator slot is m2; the second rotor slot is connected to the outer peripheral surface of the rotor punching through the opening, and the width of the opening is L1; wherein L1<m2.

[0027] Furthermore, 1.5*L1≤m2≤4*L1.

[0028] Furthermore, the diameter of the arc of the first rotor slot on the side away from the center of the second ring is φ2, and the diameter of the arc of the second rotor slot on the side away from the center of the second ring is φ1; wherein φ1<φ2.

[0029] Furthermore, 1.5*φ1≤φ2≤2.5*φ1.

[0030] Furthermore, the included angle between the two slot side surfaces of the first rotor slot is α2, and the included angle between the two slot side surfaces of the second rotor slot is α1; wherein α1<α2.

[0031] Furthermore, 2*α1≤α2≤4*α1.

[0032] The technical solution of the utility model is applied. The stator structure of the utility model includes a stator core and a stator winding arranged on the stator core. The stator winding includes a plurality of phase windings. The plurality of phase windings include a main phase winding and a secondary phase winding. The stator core is formed by stacking a plurality of stator punching sheets. The stator punching sheets include: a stator yoke, which is a first circular ring; a plurality of stator teeth, which are all connected to the inner wall surface of the first circular ring, and the plurality of stator teeth are arranged in sequence around the center of the first circular ring; the plurality of stator teeth include a plurality of groups of first stator teeth and a plurality of groups of second stator teeth, each of which is a stator tooth. Each group of first stator teeth includes two first stator teeth, each group of second stator teeth includes at least one second stator teeth, multiple groups of first stator teeth are arranged at intervals to form multiple first intervals, and multiple groups of second stator teeth are arranged in multiple first intervals in a one-to-one correspondence; wherein, one of the main phase winding and the auxiliary phase winding is wound on each first stator tooth, and the winding direction of the phase winding on each first stator tooth is the same; the other of the main phase winding and the auxiliary phase winding is wound on each second stator tooth, and the winding direction of the phase winding on each second stator tooth is the same. In this way, the stator structure of the utility model is the stator of a single-phase induction motor. By winding the main phase winding and the auxiliary phase winding on the first stator teeth and the second stator teeth respectively, the copper consumption of the motor during production is reduced, the tooth harmonic content of the motor is reduced, the vibration and noise of the motor are reduced, the stability of the motor during operation is enhanced, and the problem that the single-phase induction motor in the prior art is prone to large vibration noise and poor starting ability due to the use of concentrated windings in the stator is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0034] Figure 1 A top view of a first embodiment of a stator structure according to the present utility model is shown;

[0035] Figure 2 A top view of a second embodiment of a stator structure according to the present utility model is shown;

[0036] Figure 3 Shown include Figure 1 or Figure 2A top view of a first embodiment of a rotor of an electric machine with a stator structure shown;

[0037] Figure 4 Shown include Figure 1 or Figure 2 A top view of a second embodiment of a rotor of an electric machine with a stator structure shown;

[0038] Figure 5 A curve diagram showing the relationship between N / 2P and additional torque of the motor of the utility model is shown;

[0039] Figure 6 The graph showing the relationship between N1 / N2 and the amplitude of the third tooth harmonic of the motor of the utility model is shown;

[0040] Figure 7 A curve diagram showing the relationship between Φ2 / Φ1 and the amplitude of the 4th harmonic of the electromagnetic force of the motor of the utility model is shown;

[0041] Figure 8 A comparison diagram of the speed-torque relationship between the motor of the utility model and the motor in the prior art is shown;

[0042] Fig. 9 A comparison diagram of the current harmonic amplitudes of the motor of the utility model and the motor in the prior art is shown;

[0043] Fig.10 A comparison diagram of electromagnetic force harmonic amplitudes of the motor of the utility model and the motor in the prior art is shown;

[0044] Fig.11 A torque curve comparison diagram of the motor of the utility model and the motor in the prior art is shown.

[0045] The above drawings include the following reference numerals:

[0046] 1. Stator; 2. Rotor; 3. Stator core; 4. Stator yoke; 5. Stator punching sheet; 6. Stator tooth; 61. First stator tooth; 62. Second stator tooth; 8. Stator tooth shoe; 9. Rotor core; 10. Rotor tooth shoe; 11. Rotor punching sheet; 12. Rotor tooth; 13. Rotor slot; 131. First rotor slot; 132. Second rotor slot; 15. Stator slot; 151. First stator slot; 152. Second stator slot; 16. Rotor yoke; 18. Stator winding; 19. Main phase winding; 20. Auxiliary phase winding. DETAILED DESCRIPTION

[0047] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0048] like Figure 1 and Figure 2 As shown, the utility model provides a stator structure, including a stator core 3 and a stator winding 18 arranged on the stator core 3, the stator winding 18 includes a plurality of phase windings, the plurality of phase windings include a main phase winding 19 and an auxiliary phase winding 20; the stator core 3 is formed by stacking a plurality of stator punching sheets 5, the stator punching sheets 5 include: a stator yoke 4, the stator yoke 4 is a first circular ring; a plurality of stator teeth 6, the plurality of stator teeth 6 are all connected to the inner wall surface of the first circular ring, and the plurality of stator teeth 6 are arranged in sequence around the center of the first circular ring; the plurality of stator teeth 6 include a plurality of groups of first stator teeth 61 and a plurality of groups of second stator teeth 62, each group of first stator teeth 61 is a plurality of first stator teeth 62, and each group of first stator teeth 62 is a plurality of second stator teeth 62. The tooth portions 61 each include two first stator tooth portions 61, each group of second stator tooth portions 62 includes at least one second stator tooth portion 62, multiple groups of first stator tooth portions 61 are arranged at intervals to form multiple first intervals, and multiple groups of second stator tooth portions 62 are arranged one by one in the multiple first intervals; wherein, one of the main phase winding 19 and the auxiliary phase winding 20 is wound on each first stator tooth portion 61, and the winding directions of the phase windings on each first stator tooth portion 61 are the same; the other of the main phase winding 19 and the auxiliary phase winding 20 is wound on each second stator tooth portion 62, and the winding directions of the phase windings on each second stator tooth portion 62 are the same.

[0049] In this way, the stator structure of the utility model is the stator of a single-phase induction motor. By respectively winding the main phase winding 19 and the auxiliary phase winding 20 on the first stator tooth portion 61 and the second stator tooth portion 62, the copper consumption of the motor is reduced, the tooth harmonic content of the motor is reduced, the vibration and noise of the motor are reduced, and the stability of the motor during operation is enhanced. This solves the problem in the prior art that the single-phase induction motor in the prior art is prone to large vibration and noise and poor starting ability due to the use of concentrated windings in the stator.

[0050] The center of the first circular ring is located on the central axis of the first circular ring.

[0051] Optionally, a main phase winding 19 is wound on the first stator tooth portion 61, and the winding direction of the main phase winding 19 on each first stator tooth portion 61 is the same, and a secondary phase winding 20 is wound on the second stator tooth portion 62; or a secondary phase winding 20 is wound on the first stator tooth portion 61, and the winding direction of the secondary phase winding 20 on each first stator tooth portion 61 is the same, and a main phase winding 19 is wound on the second stator tooth portion 62.

[0052] like Figure 1In the first embodiment of the stator structure shown, the multiple stator teeth 6 include multiple groups of first stator teeth 61 and multiple groups of second stator teeth 62, each group of first stator teeth 61 includes two first stator teeth 61, each group of second stator teeth 62 includes one second stator tooth 62, the multiple groups of first stator teeth 61 are arranged at intervals to form multiple first intervals, and the multiple groups of second stator teeth 62 are arranged in the multiple first intervals in a one-to-one correspondence; wherein, one of the main phase winding 19 and the auxiliary phase winding 20 is wound on each first stator tooth 61, and the winding directions of the phase windings on each first stator tooth 61 are the same; the other of the main phase winding 19 and the auxiliary phase winding 20 is wound on each second stator tooth 62, and the winding directions of the phase windings on each second stator tooth 62 are the same.

[0053] like Figure 2 In the second embodiment of the stator structure shown, the multiple stator teeth 6 include multiple groups of first stator teeth 61 and multiple groups of second stator teeth 62, each group of first stator teeth 61 includes two first stator teeth 61, each group of second stator teeth 62 includes two second stator teeth 62, the multiple groups of first stator teeth 61 are arranged at intervals to form multiple first intervals, and the multiple groups of second stator teeth 62 are arranged in the multiple first intervals in a one-to-one correspondence; wherein, one of the main phase winding 19 and the auxiliary phase winding 20 is wound on each first stator tooth 61, and the winding directions of the phase windings on each first stator tooth 61 are the same; the other of the main phase winding 19 and the auxiliary phase winding 20 is wound on each second stator tooth 62, and the winding directions of the phase windings on each second stator tooth 62 are the same.

[0054] Specifically, the main phase winding 19 is wound on each first stator tooth 61, and the winding direction of the main phase winding 19 on each first stator tooth 61 is the same; the auxiliary phase winding 20 is wound on each second stator tooth 62, and the winding direction of the auxiliary phase winding 20 on each second stator tooth 62 is the same.

[0055] Specifically, the number of stator teeth 6 is N, and the number of poles of the motor where the stator structure is located is 2P; wherein, 2*2P<N<5*2P, and N is an integer multiple of P.

[0056] Depend on Figure 5 From the relationship curve diagram of N / 2P and additional torque of the motor of the utility model shown, it can be seen that under the same working condition, when 2*2P<N<5*2P, the additional torque of the motor is at a relatively low level, and the value of the additional torque increases slowly, which can reduce the additional torque of the single-phase induction motor and make the motor easier to start.

[0057] Specifically, N stator teeth 6 are arranged on the stator sheet 5, and the motor in which the stator structure is located includes a rotor 2, and the rotor 2 includes a rotor core 9 formed by stacking a plurality of rotor sheets 11, and M rotor teeth 12 are arranged on the rotor sheets 11; wherein MN≥6, and M is an even number.

[0058] In this way, the stator structure of the utility model can achieve the effect of increasing the number of stator teeth 6 by limiting the relationship between the number of stator teeth 6 and the number of poles of the motor and the number of rotor teeth 12, thereby increasing the tooth harmonic order, reducing the tooth harmonic amplitude, and reducing the additional torque to enhance the starting ability of the motor.

[0059] like Figure 1 As shown, the stator tooth width of the first stator tooth portion 61 is k1, and the stator tooth width of the second stator tooth portion 62 is k2; wherein k1<k2.

[0060] Specifically, the stator tooth width of the first stator tooth portion 61 refers to the width of the first stator tooth portion 61 in a direction perpendicular to the central axis of the first circular ring and perpendicular to the radius of the first circular ring, and the stator tooth width of the second stator tooth portion 62 refers to the width of the second stator tooth portion 62 in a direction perpendicular to the central axis of the first circular ring and perpendicular to the radius of the first circular ring.

[0061] Preferably, 0.4*k2≤k1≤0.7*k2.

[0062] In this way, the stator punching sheets can be reasonably utilized to increase the number of stator teeth, and a certain tooth width can not only ensure the mechanical strength of the stator structure, but also ensure the flow of stator magnetic flux, avoid magnetic field saturation, and improve the working efficiency of the motor.

[0063] like Figure 1 As shown, each stator tooth portion 6 includes a stator tooth shoe 8; the angle between the two ends of the stator tooth shoe 8 of each first stator tooth portion 61 and the center of the first circular ring is a0; in two adjacent first stator tooth portions 61, the angle between the line connecting the end of the stator tooth shoe 8 of the first first stator tooth portion 61 away from the second first stator tooth portion 61 and the center of the first circular ring and the angle between the end of the stator tooth shoe 8 of the second first stator tooth portion 61 away from the first first stator tooth portion 61 and the center of the first circular ring is a1; the angle between the two ends of the stator tooth shoe 8 of each second stator tooth portion 62 and the center of the first circular ring is a2; wherein, a1>a2>a0.

[0064] In this way, the first stator tooth portion 61 can be ensured to have a reasonable tooth width, avoiding the first stator tooth portion 61 having a too small tooth width, which affects the saturation of the first stator tooth portion 61; and the mechanical strength of the first stator tooth portion 61 can be ensured, thereby reducing the difficulty of stator processing.

[0065] like Figure 1 As shown, a stator slot 15 is formed between any two adjacent stator teeth 6; the stator slot 15 between two adjacent first stator teeth 61 is a first stator slot 151; the stator slot 15 between each second stator tooth 62 and the first stator tooth 61 adjacent thereto is a second stator slot 152; wherein, the first stator slot 151 is a symmetrical structure, and the second stator slot 152 is a symmetrical structure or an asymmetrical structure; the two second stator slots 152 located on opposite sides of each first stator slot 151 and adjacent to the corresponding first stator slot 151 are arranged in plane symmetry with respect to the symmetry center plane of the corresponding first stator slot 151.

[0066] In this way, the main phase winding and the auxiliary phase winding can be arranged reasonably, the slot harmonics can be reduced, the current waveform can be improved, and the noise and harmonic losses can be reduced.

[0067] Specifically, the width of the first end face refers to the width of the first end face in a direction perpendicular to the central axis of the first ring and parallel to the radius of the first ring, and the width of the second end face refers to the width of the second end face in a direction perpendicular to the central axis of the first ring and parallel to the radius of the first ring.

[0068] like Figure 1 As shown, the minimum width of the slot opening of the first stator slot 151 is m1; the minimum width of the slot opening of the second stator slot 152 is m2; wherein 0.8*m1≤m2≤1.2*m1.

[0069] Specifically, the maximum width of the slot of the first stator slot 151 refers to the maximum width of the slot of the first stator slot 151 in a direction perpendicular to the central axis of the first circular ring and perpendicular to the radius of the first circular ring; the maximum width of the slot of the second stator slot 152 refers to the maximum width of the slot of the second stator slot 152 in a direction perpendicular to the central axis of the first circular ring and perpendicular to the radius of the first circular ring.

[0070] In this way, limiting the slot width can increase the number of tooth harmonics, reduce the amplitude of tooth harmonics, improve the problem of motor starting torque depression, and enhance the motor starting ability.

[0071] like Figure 1 As shown, the area of ​​the projection of the first stator slot 151 on the first plane perpendicular to the central axis of the stator structure is s1; the area of ​​the projection of the second stator slot 152 on the first plane is s2; wherein s1≤s2.

[0072] Preferably, s2≤2.5*s1.

[0073] Further preferably, s2≤1.5*s1.

[0074] In this way, a reasonable arrangement of stator slots can maximize the use of the area of ​​the stator punching sheets, which can not only avoid stator magnetic field saturation, but also provide a reasonable arrangement space for the main and auxiliary phase windings, weaken tooth harmonics, reduce noise and harmonic losses, and improve motor efficiency.

[0075] like Figure 1 As shown, the maximum depth of the slot of the first stator slot 151 is D1, and the maximum depth of the slot of the second stator slot 152 is D2, wherein D1≤D2.

[0076] Specifically, the maximum depth of the slot of the first stator slot 151 refers to the maximum depth of the slot of the first stator slot 151 in a direction perpendicular to the central axis of the first circular ring and parallel to the radius of the first circular ring, which is D1; ​​the maximum depth of the slot of the second stator slot 152 refers to the maximum depth of the slot of the second stator slot 152 in a direction perpendicular to the central axis of the first circular ring and parallel to the radius of the first circular ring, which is D2, wherein D1≤D2.

[0077] Preferably, D2≤1.5*D1.

[0078] In this way, limiting the notch depth can increase the number of tooth harmonics, reduce the amplitude of tooth harmonics, improve the motor starting torque concave problem, and enhance the motor starting ability.

[0079] In the stator structure of the present invention, the number of turns of the main phase winding 19 is N2, and the number of turns of the auxiliary phase winding 20 is N1; wherein, N2<N1.

[0080] Preferably, 0.1*N1≤N2≤0.4*N1.

[0081] In this way, a reasonable number of main and auxiliary phase turns combined with the stator small teeth and stator large teeth can weaken tooth harmonics, reduce noise and harmonic losses, and improve motor efficiency.

[0082] Depend on Figure 6 From the relationship curve between N1 / N2 and the third tooth harmonic amplitude of the motor of the present invention, it can be seen that when 0.1*N2≤N1≤0.4*N2, the third tooth harmonic amplitude of the motor is at a relatively low level, which can weaken the tooth harmonic amplitude and reduce the vibration noise of the motor.

[0083] The utility model also provides a motor, comprising: a stator 1, the stator 1 is the above-mentioned stator structure; a rotor 2, the rotor 2 comprises a rotor core 9, the rotor core 9 is formed by stacking a plurality of rotor punchings 11, an even number of rotor slots 13 are arranged at intervals on the rotor punchings 11, and the even number of rotor slots 13 are evenly arranged 360 degrees around the center of the rotor punching 11.

[0084] like Figure 3 and Figure 4As shown, the rotor punching 11 includes: a rotor yoke 16, which is a second circular ring; a plurality of rotor teeth 12, which are connected to the outer circumference of the second circular ring and are arranged in sequence around the center of the second circular ring, and a rotor slot 13 is formed between any two adjacent rotor teeth 12; the number of the plurality of stator teeth 6 is H, and the number of the plurality of rotor teeth 12 is M; wherein MH≥6, and M is an even number. The center of the second circular ring is located on the central axis of the second circular ring.

[0085] like Figure 3 As shown, the even number of rotor slots 13 include a plurality of first rotor slots 131 and a plurality of second rotor slots 132, and the plurality of first rotor slots 131 are arranged at intervals to form a plurality of second intervals, and at least one second rotor slot 132 is arranged in each second interval; wherein the area of ​​the projection of the first rotor slot 131 on the second plane perpendicular to the central axis of the rotor 2 is s3, and the area of ​​the projection of the second rotor slot 132 on the second plane is s4; wherein s3>s4. Specifically, the cross section of the first rotor slot 131 refers to the area of ​​the cross section of the first rotor slot 131 cut by the second plane perpendicular to the central axis of the second circular ring, which is s3, and the cross section of the second rotor slot 132 refers to the area of ​​the cross section of the second rotor slot 132 cut by the second plane perpendicular to the central axis of the second circular ring, which is s4.

[0086] In this way, the rotor uses conductor slots of different sizes to make the rotor teeth asymmetric, which can weaken the rotor tooth harmonics and reduce the influence of electromagnetic force.

[0087] like Figure 3 As shown, the first rotor slot 131 is spaced apart from the outer circumferential surface of the rotor punching 11, and the minimum distance between the first rotor slot 131 and the outer circumferential surface of the rotor punching 11 is L2; ​​the second rotor slot 132 is connected to the outer circumferential surface of the rotor punching 11 through an opening, and the width of the opening is L1; wherein, L2≤L1.

[0088] Preferably, L1≤1.8*L2.

[0089] In this way, the number of slots in the rotor conductor slots can be reduced, the rotor tooth harmonics and additional torque can be weakened, and the starting ability of the motor can be improved. In addition, limiting the rotor slot width can increase the number of tooth harmonics, reduce the tooth harmonic amplitude, weaken the asynchronous additional torque, and improve the starting ability of the motor. Limiting the minimum distance between the large conductor slot and the outer periphery of the rotor can reduce the motor leakage flux and improve the motor efficiency while ensuring the mechanical strength of the rotor.

[0090] like Figure 3As shown, the stator 1 is the stator structure mentioned above; the minimum width of the slot of the second stator slot 152 is m2; the second rotor slot 132 is connected to the outer peripheral surface of the rotor punching 11 through the opening, and the width of the opening is L1; wherein L1<m2.

[0091] Specifically, the maximum width of the slot opening of the second stator slot 152 refers to the maximum width of the slot opening of the second stator slot 152 in a direction perpendicular to the central axis of the first circular ring and perpendicular to the radius of the first circular ring.

[0092] Preferably, 1.5*L1≤m2≤4*L1.

[0093] like Figure 3 As shown, the diameter of the arc of the first rotor slot 131 on the side away from the center of the second ring is φ2, and the diameter of the arc of the second rotor slot 132 on the side away from the center of the second ring is φ1; wherein φ1<φ2.

[0094] Preferably, 1.5*φ1≤φ2≤2.5*φ1.

[0095] In this way, it can be avoided that the width of the magnetic channel between the small conductor slot and the large conductor slot near the slot bottom arc of the rotor outer circle is too large or too small, which affects the saturation of the rotor teeth.

[0096] Depend on Figure 7 From the relationship curve diagram of Φ2 / Φ1 and the 4th electromagnetic force harmonic amplitude of the motor of the present invention shown, it can be seen that when 1.5*φ1≤φ2≤2.5*φ1, the 4th electromagnetic force harmonic amplitude of the motor of the present invention is relatively low, which can reduce the influence of the electromagnetic force and reduce the main vibration noise peak of the motor.

[0097] like Figure 3 As shown, the included angle between the two slot side surfaces of the first rotor slot 131 is α2, and the included angle between the two slot side surfaces of the second rotor slot 132 is α1; wherein α1<α2.

[0098] Preferably, 2*α1≤α2≤4*α1.

[0099] In this way, it is possible to ensure that there is sufficient magnetic conductive width between the small conductor slot and the large conductor slot, thereby avoiding the magnetic field saturation phenomenon and affecting the magnetic flux flow in the channel between the conductor slots.

[0100] like Figure 4 As shown, the first rotor groove 131 and the second rotor groove 132 are both connected to the outer peripheral surface of the rotor punching 11 through the opening.

[0101] Figure 8 The figure shows the speed-torque relationship comparison between the motor proposed by the utility model and the motor in the prior art. Figure 8 It can be seen that, compared with the existing motors, the motor proposed in the utility model (for example, a single-phase asynchronous motor) has a smoother torque change in the low-speed stage, a significantly improved asynchronous additional torque, and a better starting ability.

[0102] In addition, if Fig. 9 , Fig.10 and Fig.11 As shown, Fig. 9 The figure shows the comparison of the current harmonic amplitude of the motor proposed by the utility model and the motor in the prior art. Fig.10 The figure shows the comparison of electromagnetic force harmonic amplitudes of the motor proposed by the utility model and the motor in the prior art. Fig.11 A torque curve comparison diagram of the motor proposed in the utility model and the motor in the prior art is shown. From the above three figures, it can be seen that the motor proposed in the utility model has lower current harmonic amplitude and electromagnetic force harmonic amplitude than the existing motor, and the torque fluctuation is smaller. Therefore, the technical solution of the utility model can effectively improve the harmonic situation of the motor and reduce the vibration noise of the motor.

[0103] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0104] A stator structure of the utility model comprises a stator core 3 and a stator winding 18 arranged on the stator core 3, the stator winding 18 comprises a plurality of phase windings, the plurality of phase windings comprises a main phase winding 19 and a secondary phase winding 20; the stator core 3 is formed by stacking a plurality of stator punching sheets 5, the stator punching sheets 5 comprises: a stator yoke 4, the stator yoke 4 is a first circular ring; a plurality of stator teeth 6, the plurality of stator teeth 6 are all connected to the inner wall surface of the first circular ring, the plurality of stator teeth 6 are sequentially arranged at intervals around the center of the first circular ring; the plurality of stator teeth 6 comprises a plurality of groups of first stator teeth 61 and a plurality of groups of second stator teeth 62, each group of first stator teeth 6 1 includes two first stator tooth portions 61, each group of second stator tooth portions 62 includes at least one second stator tooth portion 62, multiple groups of first stator tooth portions 61 are arranged at intervals to form multiple first intervals, and multiple groups of second stator tooth portions 62 are arranged in the multiple first intervals in a one-to-one correspondence; wherein, one of the main phase winding 19 and the auxiliary phase winding 20 is wound on each first stator tooth portion 61, and the winding directions of the phase windings on each first stator tooth portion 61 are the same; the other of the main phase winding 19 and the auxiliary phase winding 20 is wound on each second stator tooth portion 62, and the winding directions of the phase windings on each second stator tooth portion 62 are the same. In this way, the stator structure of the utility model is the stator of a single-phase induction motor. By respectively winding the main phase winding 19 and the auxiliary phase winding 20 on the first stator tooth portion 61 and the second stator tooth portion 62, the copper consumption of the motor is reduced, the tooth harmonic content of the motor is reduced, the vibration and noise of the motor are reduced, and the stability of the motor during operation is enhanced. This solves the problem in the prior art that the single-phase induction motor in the prior art is prone to large vibration and noise and poor starting ability due to the use of concentrated windings in the stator.

[0105] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0106] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0107] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0108] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0109] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0110] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stator structure, characterized in that: It comprises a stator core (3) and a stator winding (18) arranged on the stator core (3), wherein the stator winding (18) comprises a plurality of phase windings, and the plurality of phase windings comprises a main phase winding (19) and a secondary phase winding (20); The stator core (3) is formed by stacking a plurality of stator punching sheets (5), wherein the stator punching sheets (5) include: A stator yoke (4), wherein the stator yoke (4) is a first circular ring; A plurality of stator teeth (6), each of the plurality of stator teeth (6) being connected to the inner wall surface of the first circular ring, and the plurality of stator teeth (6) being arranged in sequence and spaced apart around the center of the first circular ring; The plurality of stator teeth (6) include a plurality of groups of first stator teeth (61) and a plurality of groups of second stator teeth (62), each group of the first stator teeth (61) includes two first stator teeth (61), each group of the second stator teeth (62) includes at least one second stator tooth (62), the plurality of groups of first stator teeth (61) are arranged at intervals to form a plurality of first intervals, and the plurality of groups of second stator teeth (62) are arranged in a one-to-one correspondence within the plurality of first intervals; Wherein, one of the main phase winding (19) and the auxiliary phase winding (20) is wound on each of the first stator teeth (61), and the winding directions of the phase windings on each of the first stator teeth (61) are the same; and the other of the main phase winding (19) and the auxiliary phase winding (20) is wound on each of the second stator teeth (62), and the winding directions of the phase windings on each of the second stator teeth (62) are the same.

2. The stator structure according to claim 1, characterized in that: The number of the stator teeth (6) is N, and the number of poles of the motor in which the stator structure is located is 2P; wherein 2*2P<N<5*2P, and N is an integer multiple of P.

3. The stator structure according to claim 1, characterized in that: The stator punching sheet (5) is provided with H stator teeth (6), the motor in which the stator structure is located comprises a rotor (2), the rotor (2) comprises a rotor core (9) formed by stacking a plurality of rotor punching sheets (11), and the rotor punching sheet (11) is provided with M rotor teeth (12); Among them, MH≥6, and M is an even number.

4. The stator structure according to claim 1, characterized in that: The stator tooth width of the first stator tooth portion (61) is k1, and the stator tooth width of the second stator tooth portion (62) is k2; wherein k1<k2.

5. The stator structure according to claim 4, characterized in that: 0.4*k2≤k1≤0.7*k2.

6. The stator structure according to claim 1, characterized in that: Each of the stator teeth (6) comprises a stator tooth shoe (8); The included angle between the lines connecting the two ends of the stator tooth shoes (8) of each of the first stator tooth parts (61) and the center of the first circular ring is a0; In two adjacent first stator tooth portions (61), an angle a1 is included between a line connecting one end of the stator tooth shoe (8) of the first first stator tooth portion (61) away from the second first stator tooth portion (61) and the center of the first circular ring and a line connecting one end of the stator tooth shoe (8) of the second first stator tooth portion (61) away from the first first stator tooth portion (61) and the center of the first circular ring; The included angle between the lines connecting the two ends of the stator tooth shoes (8) of each of the second stator tooth parts (62) and the center of the first circular ring is a2; Among them, a1>a2>a0.

7. The stator structure according to claim 1, characterized in that: A stator slot (15) is formed between any two adjacent stator teeth (6); The stator slot (15) between two adjacent first stator teeth (61) is a first stator slot (151); The stator slot (15) between each of the second stator teeth (62) and the first stator teeth (61) adjacent thereto is a second stator slot (152); The first stator slot (151) is a symmetrical structure, and the second stator slot (152) is a symmetrical structure or an asymmetrical structure; two second stator slots (152) located on opposite sides of each first stator slot (151) and adjacent to the corresponding first stator slot (151) are arranged in a plane symmetrical manner with respect to a symmetrical center plane of the corresponding first stator slot (151).

8. The stator structure according to claim 7, characterized in that: The minimum width of the slot opening of the first stator slot (151) is m1; the minimum width of the slot opening of the second stator slot (152) is m2; wherein 0.8*m1≤m2≤1.2*m1.

9. The stator structure according to claim 7, characterized in that: The projection area of ​​the first stator slot (151) on a first plane perpendicular to the central axis of the stator structure is s1; the projection area of ​​the second stator slot (152) on the first plane is s2; wherein s1≤s2.

10. The stator structure according to claim 9, characterized in that: s2≤2.5*s1.

11. The stator structure according to claim 9, characterized in that: s2≤1.5*s1.

12. The stator structure according to claim 7, characterized in that: The maximum depth of the slot of the first stator slot (151) is D1, and the maximum depth of the slot of the second stator slot (152) is D2, wherein D1≤D2.

13. The stator structure according to claim 12, characterized in that: D2≤1.5*D1.

14. The stator structure according to claim 1, characterized in that: The number of turns of the main phase winding (19) is N2, and the number of turns of the auxiliary phase winding (20) is N1; wherein N2<N1.

15. The stator structure according to claim 14, characterized in that: 0.1*N1≤N2≤0.4*N1.

16. A motor, characterized in that: include: A stator (1), wherein the stator (1) is a stator structure according to any one of claims 1 to 15; A rotor (2), the rotor (2) comprising a rotor core (9), the rotor core (9) being formed by stacking a plurality of rotor punchings (11), an even number of rotor slots (13) being arranged at intervals on the rotor punchings (11), the even number of rotor slots (13) being evenly arranged 360 degrees around the center of the rotor punchings (11).

17. The electric machine according to claim 16, characterized in that The rotor punching sheet (11) comprises: A rotor yoke (16), wherein the rotor yoke (16) is a second circular ring; A plurality of rotor teeth (12), each of which is connected to the outer circumferential surface of the second circular ring and is arranged in sequence around the center of the second circular ring, and each of which forms a rotor slot (13) between any two adjacent rotor teeth (12).

18. The electric machine according to claim 17, characterized in that The even number of rotor slots (13) include a plurality of first rotor slots (131) and a plurality of second rotor slots (132), the plurality of first rotor slots (131) are arranged at intervals to form a plurality of second intervals, and at least one second rotor slot (132) is arranged in each of the second intervals; The projection area of ​​the first rotor slot (131) on a second plane perpendicular to the central axis of the rotor (2) is s3, and the projection area of ​​the second rotor slot (132) on the second plane is s4; wherein s3>s4.

19. The electric machine according to claim 18, characterized in that The first rotor slot (131) is spaced apart from the outer peripheral surface of the rotor punching (11), and the minimum distance between the first rotor slot (131) and the outer peripheral surface of the rotor punching (11) is L2; ​​the second rotor slot (132) is connected to the outer peripheral surface of the rotor punching (11) through an opening, and the width of the opening is L1; wherein L2≤L1.

20. The electric machine according to claim 19, characterized in that L1≤1.8*L2.

21. The electric machine according to claim 18, characterized in that The stator (1) is the stator structure according to claim 7; the minimum width of the slot of the second stator slot (152) is m2; the second rotor slot (132) is connected to the outer peripheral surface of the rotor punching (11) through an opening, and the width of the opening is L1; wherein L1<m2.

22. The electric machine according to claim 21, characterized in that 1.5*L1≤m2≤4*L1.

23. The electric machine according to claim 18, characterized in that The diameter of the arc of the first rotor slot (131) on the side away from the center of the second circular ring where the top surface is located is φ2, and the diameter of the arc of the second rotor slot (132) on the side away from the center of the second circular ring where the top surface is located is φ1; wherein φ1<φ2.

24. The electric machine according to claim 23, characterized in that 1.5*φ1≤φ2≤2.5*φ1.

25. The electric machine according to claim 18, characterized in that The included angle between the two slot side surfaces of the first rotor slot (131) is α2, and the included angle between the two slot side surfaces of the second rotor slot (132) is α1; wherein α1<α2.

26. The electric machine according to claim 25, characterized in that 2*α1≤α2≤4*α1。

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