Stator structure and single-phase permanent magnet motor

Abstract

The utility model provides a stator structure and a single-phase permanent magnet motor. The stator structure comprises a stator core (1), the stator core (1) comprises a plurality of stator core bodies (2), the stator core bodies (2) are provided with stator teeth (3), in a section perpendicular to the central axis of the stator core (1), the inner circle of each stator tooth (3) comprises a first arc section (4) and a second arc section (5), the first arc section (4) is of a concentric structure of the outer circle of the stator core (1), and the second arc section (5) is of a concentric structure of the outer circle of the stator core (1). And the second arc section (5) is an eccentric structure of the outer circle of the stator iron core (1). According to the stator structure provided by the utility model, when the rotor structure is static, the angle of the rotor center line deviating from the stator center line is in a reasonable range, and the requirements of starting torque of the single-phase permanent magnet motor under different load working conditions are met.

Description

Technical Field

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

[0002] With the rapid development of permanent magnet motor technology, permanent magnet motors are receiving more and more attention. Compared with other motors such as traditional electromagnetic motors, permanent magnet motors have the advantages of high output density, high efficiency, easy maintenance and simple structure.

[0003] Among them, the single-phase permanent magnet motor has a single-phase winding, requires fewer switching devices to drive the main circuit, has a low hardware cost for the control system, and has the characteristics of small size, light weight, simple structure, easy large-scale manufacturing and low manufacturing cost. It has been widely used in small-power household appliances such as fans, water pumps, and CD drives that do not require high dynamic performance.

[0004] However, the magnetic field inside the single-phase permanent magnet motor is a pulsating magnetic field, and the electromagnetic torque of the motor has a 0 point position. If a specific structure is not adopted, the motor parking position (the point where the cogging torque is 0) coincides with the point where the electromagnetic torque is 0. At this time, no matter what current is passed, the motor cannot start, so there is a problem of starting dead point. Utility Model Content

[0005] The main purpose of the utility model is to provide a stator structure and a single-phase permanent magnet motor, which can make the angle of the rotor center line offset from the stator center line within a reasonable range when the rotor structure is stationary, thereby meeting the starting torque requirements of the single-phase permanent magnet motor under different load conditions.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a stator structure is provided, including a stator core, the stator core including a plurality of stator core bodies, the stator core bodies having stator teeth, and in a cross section perpendicular to the central axis of the stator core, the inner circle of the stator teeth includes a first arc segment and a second arc segment, the first arc segment is a concentric structure of the outer circle of the stator core, and the second arc segment is an eccentric structure of the outer circle of the stator core.

[0007] Further, a central angle formed by the first arc segment relative to the center of the outer circle of the stator core is different from a central angle formed by the second arc segment relative to the center of the outer circle of the stator core.

[0008] Furthermore, the center of the second arc segment is located on a circle with the outer circle of the stator core as the center and R6 as the radius, wherein R6>0.

[0009] Furthermore, the angle between the tooth center line of the stator tooth is e and the radial line with the outer circle of the stator core as the center is the first radial line, and the center of the second arc segment is located at the intersection of the first radial line and the circle with a radius of R6, where e is the angle of half the stator core, e=180° / Z1, and Z1 is the number of teeth of the stator core.

[0010] Further, the radius of the first arc segment is R4, the arc angle is f, the radius of the second arc segment is R5, the arc angle is g+h, h is the center angle of the second arc segment on one side of the tooth center line of the stator tooth, and g is the center angle of the second arc segment on the other side of the tooth center line of the stator tooth, wherein R4, R5 and R6 satisfy:

[0011] Cos(g+e)=(R4*R4+R6*R6-R5*R5) / (2*R4*R6).

[0012] Further, the radius of the first arc segment is R4, and the arc angle is f, where f is the center angle of the first arc segment on the first side of the tooth center line of the stator tooth; the radius of the second arc segment is R5, and the arc angle is g+h, where h is the center angle of the second arc segment on the second side of the tooth center line of the stator tooth, and g is the center angle of the second arc segment on the first side of the tooth center line of the stator tooth, and f+g≥h.

[0013] Further, the radius of the first arc segment is R4, the arc angle is f+g, f is the center angle of the first arc segment on the first side of the tooth centerline of the stator tooth, the radius of the second arc segment is R5, the arc angle is h, h is the center angle of the second arc segment on the second side of the tooth centerline of the stator tooth, g is the center angle of the first arc segment on the second side of the tooth centerline, and f≥h+g.

[0014] Furthermore, a slot is formed between the tooth shoes of adjacent stator teeth, and the width of the slot along the circumferential direction of the stator core is L5, L5=π*R4*(2e-fgh) / (6*e), R4 is the radius of the first arc segment, f is the center angle of the first arc segment on the first side of the tooth center line of the stator tooth, g is the center angle of the second arc segment on the first side of the tooth center line of the stator tooth or the center angle of the first arc segment on the second side of the tooth center line, and h is the center angle of the second arc segment on the second side of the tooth center line of the stator tooth.

[0015] Furthermore, 0.05*R4≥L5≥0.01*R4.

[0016] Furthermore, the stator core is surrounded by straight bar-shaped chain cores.

[0017] Furthermore, the chain core is arranged in pairs of two rows during punching.

[0018] Furthermore, when the chain core is in the shape of a straight bar, the spacing between the inner circles of adjacent stator teeth is L4=2*R3*sin(e), where R3 is the outer radius of the stator core, Z1 is the number of teeth of the stator core, and e is the central angle of half the stator core, e=180° / Z1.

[0019] According to another aspect of the utility model, a stator structure is provided, including a stator core, the stator core including a plurality of stator core bodies, the stator core body having stator teeth, in a cross section perpendicular to the central axis of the stator core, the inner circle of the stator tooth includes an arc segment and an open slot, the open slot is located on one side of the tooth centerline of the stator tooth, the angle between the slot centerline of the open slot and the tooth centerline is g, the angle of half the stator core body is e, and e>g>0.

[0020] According to another aspect of the utility model, a single-phase permanent magnet motor is provided, comprising a stator structure and a rotor structure, wherein the stator structure is the above-mentioned stator structure, the rotor structure is located on the inner circumference side of the stator structure, and an air gap is formed between the rotor structure and the stator structure.

[0021] Furthermore, the rotor structure includes a rotor core and permanent magnets. The permanent magnets are evenly distributed radially in the rotor core and are tangentially magnetized.

[0022] Furthermore, the number of stator teeth of the stator core is the same as the number of permanent magnets, and both are even numbers.

[0023] Furthermore, the rotor structure also includes a rotor shaft, the axial length of the stator core is L1, the axial length of the permanent magnet is L2, the axial length of the rotor core is L3, 1.5*L1≥L3≥L1, 1.5*L3≥L2≥L3.

[0024] Furthermore, 1.5*L1≥L3>L1, 1.5*L3≥L2>L3.

[0025] Furthermore, the outer circle of the rotor core includes a plurality of eccentric arcs arranged in sequence along the circumferential direction, the radius of the eccentric arc is R1, the center distribution diameter of the eccentric arc is D2, the outer circle diameter of the rotor core is D1, and D1=D2+2*R1.

[0026] Furthermore, the eccentric arc of the outer circle of the rotor core includes a middle eccentric arc and a side eccentric arc. In a cross section perpendicular to the central axis of the rotor core, the outer diameter of the rotor core is D1, the radius of the middle eccentric arc is R1, the center of the middle eccentric arc is distributed on a circle with a diameter of D2 and concentric with the central axis of the rotor core, the radius of the side eccentric arc is R2, the center of the side eccentric arc is distributed on a circle with a diameter of D3, and the center of the circle where the center of the side eccentric arc of the same eccentric arc lies coincides with the center of the middle eccentric arc.

[0027] Further, D1=D2+2*R1, R1=0.5*D3+R2.

[0028] Furthermore, the eccentric arc of the outer circle of the rotor core includes a middle eccentric arc and a side eccentric arc. In a cross section perpendicular to the central axis of the rotor core, the side eccentric arc has a cut edge on the side away from the middle eccentric arc. The central angle of the single-sided side eccentric arc is c, and the angle between the cut edge and the radial line passing through the cut edge and the side eccentric arc is d, d≤90°.

[0029] The technical solution of the utility model is applied, and the stator structure includes a stator core, and the stator core includes a plurality of stator core bodies, and the stator core body has stator teeth. In a cross section perpendicular to the central axis of the stator core, the inner circle of the stator teeth includes a first arc segment and a second arc segment, and the first arc segment is a concentric structure of the outer circle of the stator core, and the second arc segment is an eccentric structure of the outer circle of the stator core. The stator structure optimizes the inner circle of the stator teeth, and by processing the arc of the inner circle, the inner circle of the stator forms an asymmetric structure, so that the angle of the rotor centerline offsetting the stator centerline when the rotor structure is stationary is within a reasonable range, and the requirements for the starting torque of the single-phase permanent magnet motor under different load conditions are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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:

[0031] Figure 1 A schematic diagram showing the structure of a single-phase permanent magnet motor according to an embodiment of the utility model is shown;

[0032] Figure 2 A schematic cross-sectional view of a single-phase permanent magnet motor according to an embodiment of the utility model is shown;

[0033] Figure 3 A rotor core structure diagram showing a rotor structure of a single-phase permanent magnet motor according to an embodiment of the utility model;

[0034] Figure 4 A diagram showing the size of a rotor core of a rotor structure of a single-phase permanent magnet motor according to an embodiment of the utility model;

[0035] Figure 5 A diagram showing the size of a rotor core of a rotor structure of a single-phase permanent magnet motor according to an embodiment of the utility model;

[0036] Figure 6 The expanded structure diagram of the stator core of the single-phase permanent magnet motor according to the embodiment of the utility model is shown;

[0037] Figure 7 The expanded dimension structure diagram of the stator core of the single-phase permanent magnet motor according to the embodiment of the utility model is shown;

[0038] Figure 8 The following is a structural diagram showing the expanded dimensions of the stator core of the single-phase permanent magnet motor according to an embodiment of the utility model;

[0039] Fig. 9 A diagram showing the size structure of the stator core of a single-phase permanent magnet motor according to an embodiment of the utility model; and

[0040] Fig.10 The diagram shows a stamping pattern of a stator core of a single-phase permanent magnet motor according to an embodiment of the utility model.

[0041] The above drawings include the following reference numerals:

[0042] 1. Stator core; 2. Stator core body; 3. Stator teeth; 4. First arc segment; 5. Second arc segment; 6. Open slot; 7. Rotor core; 8. Permanent magnet; 9. Rotor shaft; 10. Middle eccentric arc; 11. Side eccentric arc; 12. Cut edge; 13. Notch; 14. Stator winding. DETAILED DESCRIPTION

[0043] 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.

[0044] See also Figures 1 to 10 As shown, according to an embodiment of the utility model, the stator structure includes a stator core 1, the stator core 1 includes a plurality of stator core bodies 2, the stator core body 2 has stator teeth 3, and in a cross section perpendicular to the central axis of the stator core 1, the inner circle of the stator teeth 3 includes a first arc segment 4 and a second arc segment 5, the first arc segment 4 is a concentric structure of the outer circle of the stator core 1, and the second arc segment 5 is an eccentric structure of the outer circle of the stator core 1.

[0045] The stator structure optimizes the inner circle of the stator teeth and forms an asymmetric structure by processing the arc of the inner circle, so that the angle of the rotor centerline offset from the stator centerline is within a reasonable range when the rotor structure is stationary, thereby meeting the starting torque requirements of the single-phase permanent magnet motor under different load conditions.

[0046] In this embodiment, since the inner circle of the stator tooth 3 is set to include the first arc segment 4 and the second arc segment 5, and the arc of the first arc segment 4 is a structure concentric with the outer circle of the stator core 1, and the arc of the second arc segment 5 is a structure eccentric to the outer circle of the stator core 1, an asymmetric tooth structure can be formed on both sides of the stator tooth 3, so that a biased tooth slot torque is formed between the stator core 1 and the rotor structure, so that the point where the tooth slot torque is 0 and the point where the electromagnetic torque is 0 are offset, thereby ensuring that the magnetic resistance torque of the rotor structure rotating along the path of minimum magnetic resistance in the non-working state is sufficient to overcome the mechanical friction and other resistances of the motor, and the rotor structure can be stationary at a fixed position where the rotor center line is offset relative to the stator center line every time, thereby ensuring the stability of the motor starting.

[0047] Since the inner arc of the stator teeth 3 of the stator core 1 adopts a partially eccentric design, at least a portion of the inner arc is a non-eccentric structure, which can ensure that the air gap changes less, the air gap magnetic flux density is distributed more evenly, and there will be no sudden changes in position. The torque pulsation during motor operation is lower, thereby improving the stability of the motor during operation.

[0048] In one embodiment, a central angle formed by the first arc segment 4 relative to the center of the outer circle of the stator core 1 is different from a central angle formed by the second arc segment 5 relative to the center of the outer circle of the stator core 1 .

[0049] In this embodiment, since the central angle occupied by the first arc segment 4 is different from the central angle occupied by the second arc segment 5, asymmetric teeth can be formed between the first arc segment 4 and the second arc segment 5, which is more conducive to the rotor structure being offset relative to the stator structure when stationary, thereby increasing the starting torque.

[0050] In one embodiment, the center of the second arc segment 5 is located on a circle with the outer circle of the stator core 1 as the center and R6 as the radius, wherein R6>0.

[0051] In this embodiment, the center of the eccentrically arranged second arc segment 5 is located on a circle with the outer circle of the stator core 1 as the center and R6 as the radius, so that the center of the second arc segment 5 can be evenly distributed in a preset manner, effectively controlling the eccentric structure of the second arc segment 5 and obtaining a better bias torque.

[0052] In one embodiment, the angle between the tooth center line of the stator tooth 3 is e and the radial line with the outer circle of the stator core 1 as the center is the first radial line, and the center of the second arc segment 5 is located at the intersection of the first radial line and the circle with a radius of R6, where e is the angle of half the stator core 2, e=180° / Z1, and Z1 is the number of teeth of the stator core 1.

[0053] In this embodiment, the center position of the eccentrically arranged second arc segment 5 can be effectively determined by the above method, which reduces the design difficulty, improves the processing efficiency, and ensures the processing accuracy.

[0054] In one embodiment, the radius of the first arc segment 4 is R4, the arc angle is f, the radius of the second arc segment 5 is R5, the arc angle is g+h, h is the center angle of the second arc segment 5 on one side of the tooth center line of the stator tooth 3, and g is the center angle of the second arc segment 5 on the other side of the tooth center line of the stator tooth 3, wherein R4, R5 and R6 satisfy:

[0055] Cos(g+e)=(R4*R4+R6*R6-R5*R5) / (2*R4*R6).

[0056] In this embodiment, the above formula can effectively define the relationship between R4, R5 and R6, so that the stator structure can more effectively improve the starting torque. At the same time, it can also make the settings of R4, R5 and R6 correlated, ensuring that the designed stator structure has better comprehensive performance.

[0057] In one embodiment, the radius of the first arc segment 4 is R4, and the arc angle is f, where f is the center angle of the first arc segment 4 on the first side of the tooth center line of the stator tooth 3; the radius of the second arc segment 5 is R5, and the arc angle is g+h, where h is the center angle of the second arc segment 5 on the second side of the tooth center line of the stator tooth 3, and g is the center angle of the second arc segment 5 on the first side of the tooth center line of the stator tooth 3, and f+g≥h.

[0058] In this embodiment, the center angle of the first arc segment 4 is smaller than the center angle of the second arc segment 5. The first arc segment 4 is only located on the first side of the tooth center line of the stator tooth 3 where it is located. The second arc segment 5 includes both the portion located on the second side of the tooth center line of the stator tooth 3 where it is located and the portion located on the first side of the tooth center line of the stator tooth 3 where it is located, so that the first arc segment 4 and the second arc segment 5 have different center angles. In order to increase the starting torque, the length of the non-eccentric arc can be appropriately extended, that is, the length of the first arc segment 4 can be extended, so that the length of the arc segment located on the first side of the tooth center line is greater than the length of the arc segment located on the second side of the tooth center line, that is, f+g≥h, so that the stator tooth 3 itself forms an asymmetric tooth structure.

[0059] In one embodiment, the radius of the first arc segment 4 is R4, and the arc angle is f+g, where f is the center angle of the first arc segment 4 on the first side of the tooth centerline of the stator tooth 3, the radius of the second arc segment 5 is R5, and the arc angle is h, where h is the center angle of the second arc segment 5 on the second side of the tooth centerline of the stator tooth 3, and g is the center angle of the first arc segment 4 on the second side of the tooth centerline, and f≥h+g.

[0060] In this embodiment, the center angle of the first arc segment 4 is greater than the center angle of the second arc segment 5. The first arc segment 4 includes both the portion located on the first side of the tooth center line of the stator tooth 3 where it is located and the portion located on the second side of the tooth center line of the stator tooth 3 where it is located. The second arc segment 5 is only located on the second side of the tooth center line of the stator tooth 3 where it is located, so that the first arc segment 4 and the second arc segment 5 have different center angles. In order to increase the starting torque, the length of the non-eccentric arc can be appropriately extended, that is, the length of the first arc segment 4 can be extended, so that the length of the arc segment located on the first side of the tooth center line is greater than the length of the arc segment located on the second side of the tooth center line, that is, f≥h+g, so that the stator tooth 3 itself forms an asymmetric tooth structure.

[0061] In one embodiment, a slot 13 is formed between the tooth shoes of adjacent stator teeth 3, and the width of the slot 13 along the circumferential direction of the stator core 1 is L5, L5=π*R4*(2e-fgh) / (6*e), R4 is the radius of the first arc segment 4, f is the center angle of the first arc segment 4 on the first side of the tooth center line of the stator tooth 3, g is the center angle of the second arc segment 5 on the first side of the tooth center line of the stator tooth 3 or the center angle of the first arc segment 4 on the second side of the tooth center line, and h is the center angle of the second arc segment 5 on the second side of the tooth center line of the stator tooth 3.

[0062] In one embodiment, 0.05*R4≥L5≥0.01*R4.

[0063] In this embodiment, slots 13 are formed between adjacent stator cores. By limiting the size of the slots 13, the size of the slots 13 can be designed within a reasonable range, which can ensure that the tooth torque during motor operation is small and avoid inter-tooth magnetic leakage caused by too small slots 13, thereby affecting motor performance.

[0064] In one embodiment, the stator core 1 is surrounded by straight bar-shaped chain cores.

[0065] A straight chain core is used to form the stator core 1. When the chain core is a straight structure, the distance between the two tooth shoes is wider, and high-speed fly winding can be performed first, and then the stator is rounded after winding. The slot size is small, which can effectively reduce the tooth torque of the motor.

[0066] In one embodiment, the chain core is arranged in two rows during punching.

[0067] The chain-type iron core can be inserted in two rows during punching, resulting in less iron core waste and high material utilization, which greatly reduces the material cost of the single-phase permanent magnet motor.

[0068] In one embodiment, when the chain core is in the shape of a straight bar, the spacing L4 between the inner circles of adjacent stator teeth 3 is 2*R3*sin(e), where R3 is the outer circle radius of the stator core 1, Z1 is the number of teeth of the stator core 1, and e is the central angle of half the stator core 2, e=180° / Z1.

[0069] Through the above formula, the structure of the chain core can be optimized and designed, which facilitates the molding of the chain core and reduces the molding difficulty and cost of the chain core.

[0070] In one embodiment, the stator structure includes a stator core 1, the stator core 1 includes a plurality of stator core bodies 2, the stator core body 2 has stator teeth 3, in a cross section perpendicular to the central axis of the stator core 1, the inner circle of the stator tooth 3 includes an arc segment and an open slot 6, the open slot 6 is located on one side of the tooth centerline of the stator tooth 3, the angle between the slot centerline of the open slot 6 and the tooth centerline is g, the angle of half the stator core body 2 is e, e>g>0.

[0071] In this embodiment, the arc segment structure on both sides of the tooth center line of the stator tooth 3 is processed so that the arc segment on one side is provided with an open slot 6 and the arc segment on the other side is a smooth structure. The arc segments on both sides of the tooth center line can form an asymmetric structure, which facilitates the offset of the point where the tooth slot torque is 0 and the point where the electromagnetic torque is 0 when the rotor structure is stationary, thereby facilitating self-starting after power-on.

[0072] According to an embodiment of the utility model, the single-phase permanent magnet motor includes a stator structure and a rotor structure, the stator structure is the above-mentioned stator structure, the rotor structure is located on the inner circumference side of the stator structure, and an air gap is formed between the rotor structure and the stator structure.

[0073] In one embodiment, the rotor structure includes a rotor core 7 and permanent magnets 8. The permanent magnets 8 are evenly distributed radially in the rotor core 7, and the permanent magnets 8 are tangentially magnetized.

[0074] In this embodiment, the stator structure includes a stator core 1 and a stator winding 14, and the stator winding 14 is wound on the teeth of the stator core 1 in a clockwise and counterclockwise order. The rotor structure includes a rotor core 7 and permanent magnets 8. The permanent magnets 8 are evenly inserted in the rotor core 7 in a radial form to form a built-in tangential rotor structure. The permanent magnets 8 are double-sided magnetized, the total magnetization area is large, the air gap magnetic density is high, and the motor power density is high.

[0075] Generally speaking, most of the current single-phase motors are currently used in low-power household appliances with low dynamic performance requirements. The output power is small and the volume is also small, and the internal space is not enough to place multiple tangentially magnetized permanent magnets. The single-phase motor of the embodiment of the utility model can be used in applications with higher output power. The motor is larger in volume and can hold multiple tangentially magnetized permanent magnets, which can provide greater permanent magnet work.

[0076] In one embodiment, the number of stator teeth 3 of the stator core 1 is the same as the number of permanent magnets 8 , and both are even numbers.

[0077] In one embodiment, the rotor structure further includes a rotor shaft 9, the axial length of the stator core 1 is L1, the axial length of the permanent magnet 8 is L2, the axial length of the rotor core 7 is L3, 1.5*L1≥L3≥L1, 1.5*L3≥L2≥L3.

[0078] In one embodiment, 1.5*L1≥L3>L1, 1.5*L3≥L2>L3.

[0079] In this embodiment, when the axial length L1 of the stator core 1, the axial length L2 of the permanent magnet 8 and the axial length L3 of the rotor core 7 meet the above limitations, an optimal height difference can be formed, so that the stator and rotor magnetic fields are fully coupled in three-dimensional space, further improving the motor performance.

[0080] In one embodiment, the outer circle of the rotor core 7 includes a plurality of eccentric arcs arranged in sequence along the circumferential direction, the radius of the eccentric arc is R1, the center distribution diameter of the eccentric arc is D2, the outer circle diameter of the rotor core 7 is D1, and D1=D2+2*R1.

[0081] In this embodiment, since the outer arc of the rotor core 7 is an eccentric circular structure, the air gap magnetic resistance at the center line of the rotor is smaller, thereby enhancing the salient pole effect of the rotor structure. The magnetic resistance torque of the rotor structure rotating along the path with minimum magnetic resistance in a non-working state is sufficient to overcome the mechanical friction and other resistances of the motor, so that the rotor structure can remain stationary in a fixed position when it stops running.

[0082] In one embodiment, the eccentric arc of the outer circle of the rotor core 7 includes a middle eccentric arc 10 and a side eccentric arc 11. In a cross section perpendicular to the central axis of the rotor core 7, the outer diameter of the rotor core 7 is D1, the radius of the middle eccentric arc 10 is R1, the center of the middle eccentric arc 10 is distributed on a circle with a diameter of D2 and concentric with the central axis of the rotor core 7, the radius of the side eccentric arc 11 is R2, the center of the side eccentric arc 11 is distributed on a circle with a diameter of D3, and the center of the circle where the center of the side eccentric arc 11 of the same eccentric arc is located coincides with the center of the middle eccentric arc 10.

[0083] In this embodiment, through the above design, the tangent state between the middle eccentric arc 10 and the side eccentric arc 11 located on the outer circle side of the rotor can be ensured, so that the punch press can form the outer contour at one time, reducing the processing steps, reducing the processing cost, and improving the processing efficiency.

[0084] In one embodiment, D1 = D2 + 2* R1, R1 = 0.5* D3 + R2.

[0085] In one embodiment, the eccentric arc of the outer circle of the rotor core 7 includes a middle eccentric arc 10 and a side eccentric arc 11. In a cross section perpendicular to the central axis of the rotor core 7, the side eccentric arc 11 has a cut edge 12 on the side away from the middle eccentric arc 10. The central angle of the single-sided side eccentric arc 11 is c, and the angle between the cut edge 12 and the radial line passing through the cut edge 12 and the side eccentric arc 11 is d, and d≤90°.

[0086] In this embodiment, the outer circular contour is formed by a combination of multiple arc segments and cut edges, and the air gap changes more slightly, which can further reduce the torque pulsation during the operation of the motor.

[0087] 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.

[0088] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0089] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A stator structure, characterized in that: The invention comprises a stator core (1), wherein the stator core (1) comprises a plurality of stator core bodies (2), wherein the stator core bodies (2) have stator teeth (3), and within a cross section perpendicular to the central axis of the stator core (1), the inner circle of the stator teeth (3) comprises a first arc segment (4) and a second arc segment (5), wherein the first arc segment (4) is a concentric structure of the outer circle of the stator core (1), and the second arc segment (5) is an eccentric structure of the outer circle of the stator core (1).

2. The stator structure according to claim 1, characterized in that: The center angle formed by the first arc segment (4) relative to the center of the outer circle of the stator core (1) is different from the center angle formed by the second arc segment (5) relative to the center of the outer circle of the stator core (1).

3. The stator structure according to claim 1, characterized in that: The center of the second arc segment (5) is located on a circle with the outer circle of the stator core (1) as the center and R6 as the radius, where R6>0.

4. The stator structure according to claim 3, characterized in that: The angle between the first radial line and the tooth center line of the stator tooth (3) is e, and the radial line with the outer circle of the stator core (1) as the center is the first radial line, and the center of the second circular arc segment (5) is located at the intersection of the first radial line and the circle with a radius of R6, wherein e is the angle of half the stator core (2), e=180° / Z1, and Z1 is the number of teeth of the stator core (1).

5. The stator structure according to claim 4, characterized in that: The radius of the first arc segment (4) is R4, and the arc angle is f; the radius of the second arc segment (5) is R5, and the arc angle is g+h, where h is the center angle of the second arc segment (5) on one side of the tooth center line of the stator tooth (3), and g is the center angle of the second arc segment (5) on the other side of the tooth center line of the stator tooth (3), wherein R4, R5 and R6 satisfy: Cos(g+e)=(R4*R4+R6*R6-R5*R5) / (2*R4*R6).

6. The stator structure according to claim 4, characterized in that: The radius of the first arc segment (4) is R4, and the arc angle is f, where f is the center angle of the first arc segment (4) on the first side of the tooth center line of the stator tooth (3); the radius of the second arc segment (5) is R5, and the arc angle is g+h, where h is the center angle of the second arc segment (5) on the second side of the tooth center line of the stator tooth (3), and g is the center angle of the second arc segment (5) on the first side of the tooth center line of the stator tooth (3), and f+g≥h.

7. The stator structure according to claim 4, characterized in that: The radius of the first arc segment (4) is R4, and the arc angle is f+g, where f is the center angle of the first arc segment (4) on the first side of the tooth center line of the stator tooth (3); the radius of the second arc segment (5) is R5, and the arc angle is h, where h is the center angle of the second arc segment (5) on the second side of the tooth center line of the stator tooth (3); g is the center angle of the first arc segment (4) on the second side of the tooth center line, and f≥h+g.

8. The stator structure according to claim 4, characterized in that: A slot (13) is formed between the tooth shoes of adjacent stator teeth (3), and the width of the slot (13) along the circumferential direction of the stator core (1) is L5, where L5=π*R4*(2e-fgh) / (6*e), R4 is the radius of the first circular arc segment (4), f is the center angle of the first circular arc segment (4) on the first side of the tooth center line of the stator tooth (3), g is the center angle of the second circular arc segment (5) on the first side of the tooth center line of the stator tooth (3) or the center angle of the first circular arc segment (4) on the second side of the tooth center line, and h is the center angle of the second circular arc segment (5) on the second side of the tooth center line of the stator tooth (3).

9. The stator structure according to claim 8, characterized in that: 0.05*R4≥L5≥0.01*R4.

10. The stator structure according to any one of claims 1 to 9, characterized in that: The stator iron core (1) is surrounded by straight bar-shaped chain iron cores.

11. The stator structure according to claim 10, characterized in that: The chain-type iron core is arranged in two rows when punching.

12. The stator structure according to claim 10, characterized in that: When the chain core is in the shape of a straight bar, the spacing L4 between the inner circles of adjacent stator teeth (3) is 2*R3*sin(e), wherein R3 is the outer circle radius of the stator core (1), Z1 is the number of teeth of the stator core (1), and e is the central angle of half the stator core (2), e=180° / Z1.

13. A stator structure, characterized in that: The invention comprises a stator core (1), wherein the stator core (1) comprises a plurality of stator core bodies (2), wherein the stator core body (2) has stator teeth (3), wherein in a cross section perpendicular to the central axis of the stator core (1), the inner circle of the stator teeth (3) comprises arc segments and open slots (6), wherein the open slots (6) are located on one side of the tooth centerline of the stator teeth (3), wherein the angle between the slot centerline of the open slot (6) and the tooth centerline is g, and the angle of half the stator core body (2) is e, wherein e>g>0.

14. A single-phase permanent magnet motor, comprising a stator structure and a rotor structure, characterized in that: The stator structure is the stator structure according to any one of claims 1 to 13, the rotor structure is located on the inner circumference side of the stator structure, and an air gap is formed between the rotor structure and the stator structure.

15. The single-phase permanent magnet motor according to claim 14, characterized in that: The rotor structure comprises a rotor core (7) and permanent magnets (8); the permanent magnets (8) are evenly distributed and radially inserted in the rotor core (7); and the permanent magnets (8) are tangentially magnetized.

16. The single-phase permanent magnet motor according to claim 15, characterized in that: The number of stator teeth (3) of the stator core (1) is the same as the number of permanent magnets (8), and both are even numbers.

17. The single-phase permanent magnet motor according to claim 15, characterized in that: The rotor structure also includes a rotor shaft (9), the axial length of the stator core (1) is L1, the axial length of the permanent magnet (8) is L2, the axial length of the rotor core (7) is L3, 1.5*L1≥L3≥L1, 1.5*L3≥L2≥L3.

18. The single-phase permanent magnet motor according to claim 17, characterized in that: 1.5*L1≥L3>L1, 1.5*L3≥L2>L3.

19. The single-phase permanent magnet motor according to claim 15, characterized in that: The outer circle of the rotor core (7) comprises a plurality of eccentric arcs arranged in sequence along the circumferential direction, the radius of the eccentric arc is R1, the center distribution diameter of the eccentric arc is D2, the outer circle diameter of the rotor core (7) is D1, and D1=D2+2*R1.

20. The single-phase permanent magnet motor according to claim 15, characterized in that: The eccentric arcs of the outer circle of the rotor core (7) include a middle eccentric arc (10) and a side eccentric arc (11). In a cross section perpendicular to the central axis of the rotor core (7), the outer diameter of the rotor core (7) is D1, the radius of the middle eccentric arc (10) is R1, the center of the middle eccentric arc (10) is distributed on a circle with a diameter of D2 and concentric with the central axis of the rotor core (7), the radius of the side eccentric arc (11) is R2, the center of the side eccentric arc (11) is distributed on a circle with a diameter of D3, and the center of the circle where the center of the side eccentric arc (11) of the same eccentric arc is located coincides with the center of the middle eccentric arc (10).

21. The single-phase permanent magnet motor according to claim 20, characterized in that: D1=D2+2*R1, R1=0.5*D3+R2.

22. The single-phase permanent magnet motor according to claim 15, characterized in that: The eccentric arc of the outer circle of the rotor core (7) comprises a middle eccentric arc (10) and a side eccentric arc (11); in a cross section perpendicular to the central axis of the rotor core (7), the side eccentric arc (11) has a cut edge (12) on a side away from the middle eccentric arc (10); the central angle of the side eccentric arc (11) on one side is c; the included angle between the cut edge (12) and a radial line passing through the cut edge (12) and the side eccentric arc (11) is d, and d≤90°.

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