Stator of permanent magnet synchronous motor and permanent magnet synchronous motor

Abstract

The invention provides a stator of a permanent magnet synchronous motor and the permanent magnet synchronous motor, the stator of the permanent magnet synchronous motor comprises stator tooth parts and stator yoke parts, the stator tooth parts and the stator yoke parts are connected in the radial direction of the stator, the number of the stator tooth parts in the circumferential direction is N, and stator tooth boots comprise first tooth boots and second tooth boots which are connected, the first tooth boot is located on the innermost side in the radial direction, and the circumferential width of the first tooth boot is larger than that of the second tooth boot, so that a stepped tooth part structure in the radial direction is formed; a stator groove is formed between every two adjacent stator tooth parts, the stator grooves comprise a first stator groove and a second stator groove, a groove insulating part is arranged on the groove wall of the first stator groove, a tooth boot insulating part is arranged on the groove wall of the second stator groove, a magnetic conductive component is further arranged on the tooth boot insulating part, and the magnetic conductive component extends towards the inner circle of the stator. According to the invention, the cogging torque of the stator can be reduced, the control precision and the operation stability are improved, the air gap flux density harmonic of the motor is reduced, and the electromagnetic vibration and noise of the motor are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator of a permanent magnet synchronous motor and a permanent magnet synchronous motor. Background Art

[0002] In recent years, with the development of permanent magnet material manufacturing technology and the rapid decline in costs, the excellent performance and low price have greatly promoted the development of permanent magnet motor technology. Permanent magnet motors rely on permanent magnets to generate the main magnetic field. Compared with ordinary induction motors, permanent magnet synchronous motors do not require reactive excitation current, and the rotor resistance loss is zero in synchronous operation. Therefore, it has the characteristics of high power factor and high efficiency, and can usually be used to replace induction motors with lower power and energy indicators. Its economic and social benefits are very significant and are widely used in all walks of life.

[0003] However, the permanent magnet material of the permanent magnet synchronous motor has a fixed brand and material, and its magnetic energy product remains unchanged. The air gap magnetic field of the motor is difficult to adjust. At the same time, the tooth structure of the motor makes the air gap magnetic density and back electromotive force have a large harmonic content, and the peak electromagnetic force of the motor is large, which makes the motor torque pulsation and vibration noise large, and the motor control accuracy is poor, and the operation stability is poor.

[0004] Since the permanent magnet synchronous motor in the prior art has technical problems such as large cogging torque, the present invention studies and designs a stator of a permanent magnet synchronous motor and a permanent magnet synchronous motor. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of large cogging torque of the permanent magnet synchronous motor in the prior art, thereby providing a stator of a permanent magnet synchronous motor and a permanent magnet synchronous motor.

[0006] In order to solve the above problems, the present invention provides a stator of a permanent magnet synchronous motor, which comprises:

[0007] A stator tooth portion and a stator yoke portion, wherein the stator tooth portion is connected to the stator yoke portion in the radial direction of the stator, and there are N stator tooth portions in the circumferential direction, and the stator tooth portion includes a stator tooth body and a stator tooth shoe connected in the radial direction, and the circumferential width of the stator tooth shoe is greater than the circumferential width of the stator tooth body, and along the radial outward direction of the stator, the stator tooth shoe includes a first tooth shoe and a second tooth shoe connected, the first tooth shoe is located at the radial innermost side, and the circumferential width of the first tooth shoe is greater than the circumferential width of the second tooth shoe, so as to form a stepped tooth structure in the radial direction;

[0008] There is a stator slot between two adjacent stator teeth, and the stator slot includes a stator slot one circumferentially opposite to the stator tooth body and a stator slot two circumferentially opposite to the second tooth shoe. A slot insulator is arranged on the slot wall of the stator slot one, and a tooth shoe insulator is arranged on the slot wall of the stator slot two. A magnetic conductive component is also arranged on the tooth shoe insulator, and the magnetic conductive component extends toward the inner circle of the stator.

[0009] In some embodiments,

[0010] The slot wall of the stator slot one includes a first slot wall, a second slot wall, a third slot wall, a fourth slot wall and a fifth slot wall, wherein the first slot wall is a radial inner circumferential wall of the stator yoke, the second slot wall is a circumferential wall of the stator tooth body on one side of the stator slot in a circumferential direction, the third slot wall is a radial outer circumferential wall of the second tooth shoe on one side of the stator slot in a circumferential direction, the fourth slot wall is a circumferential wall of the stator tooth body on the other side of the stator slot in a circumferential direction, and the fifth slot wall is a radial outer circumferential wall of the second tooth shoe on the other side of the stator slot in a circumferential direction, and the slot insulator extends from the third slot wall to the fifth slot wall through the second slot wall, the first slot wall and the fourth slot wall in sequence.

[0011] In some embodiments,

[0012] A winding is also provided in the stator slot 1, and the winding is wound around the outer periphery of the slot insulating member, that is, the winding is wound around the stator tooth body through the slot insulating member, and the slot insulating member is located between the stator tooth body and the winding.

[0013] In some embodiments,

[0014] The slot wall of the stator slot 2 includes a sixth slot wall, a seventh slot wall, an eighth slot wall and a ninth slot wall, the sixth slot wall is the circumferential wall of the second tooth shoe on one circumferential side of the stator slot 2, the seventh slot wall is the radial outer side wall of the first tooth shoe on one circumferential side of the stator slot, the eighth slot wall is the circumferential wall of the second tooth shoe on the other circumferential side of the stator slot 2, and the ninth slot wall is the radial outer side wall of the first tooth shoe on the other circumferential side of the stator slot 2, the tooth shoe insulator includes a tooth shoe insulator 1 respectively connected to the sixth slot wall and the seventh slot wall, and a tooth shoe insulator 2 respectively connected to the eighth slot wall and the ninth slot wall, the tooth shoe insulator 1 and the tooth shoe insulator 2 are spaced apart in the circumferential direction to form a spacing hole, so that the magnetic conductive component is penetrated from the radial outer side of the tooth shoe insulator through the spacing hole to the radial inner side of the tooth shoe insulator.

[0015] In some embodiments,

[0016] Within the projection surface of the axial end face of the stator, the tooth shoe insulator 1 and the tooth shoe insulator 2 are both "L"-shaped structures, and both include a first bent portion that is in contact with the circumferential wall of the second tooth shoe and a second bent portion that is in contact with the radial outer wall of the first tooth shoe, the surface of the first bent portion that is in contact with the second tooth shoe and the surface of the second bent portion that is in contact with the first tooth shoe are both inner surfaces, the surface of the first bent portion that is away from the second tooth shoe and the surface of the second bent portion that is away from the first tooth shoe are both outer surfaces, and the circumferential side of the second bent portion facing the spacing hole is the side edge.

[0017] In some embodiments,

[0018] The magnetic conductive component includes a trunk, a first protrusion, a second protrusion and a third protrusion. The radial inner side of the trunk is respectively connected to the outer surface of the second bent portion of the tooth shoe insulator one and the outer surface of the second bent portion of the tooth shoe insulator two. The first protrusion is connected to one circumferential end of the trunk and protrudes radially outward. The first protrusion is also connected to the outer surface of the first bent portion of the tooth shoe insulator one. The second protrusion is connected to the other circumferential end of the trunk and protrudes radially outward. The second protrusion is connected to the outer surface of the first bent portion of the tooth shoe insulator two. The third protrusion is connected to the radial inner end of the trunk and protrudes in the radial inner direction. The third protrusion is inserted from the spacing hole to the slot between two adjacent first tooth shoes.

[0019] In some embodiments,

[0020] The surface where the first protrusion contacts the outer surface of the first bent portion of the first tooth shoe insulator, and the surface where the second protrusion contacts the outer surface of the first bent portion of the second tooth shoe insulator are both first edges;

[0021] The radial inner side surface of the trunk is the second edge; the circumferential side surface of the third protrusion is the third edge, the radial inner side surface of the third protrusion is the fourth edge, the radial outer end of the first protrusion protrudes from the trunk to form a top end, the radial outer end of the second protrusion protrudes from the trunk to also form a top end, the radial outer edge of the trunk and the first protrusion and the second protrusion form a recess, and the radial outer edge of the trunk is the bottom edge of the recess.

[0022] In some embodiments,

[0023] The angle occupied by the second tooth shoe on the stator circumference is smaller than the pole arc angle, wherein the pole arc angle is the angle formed by the lines connecting the two side edges of the permanent magnet under each pole opposite to the outer circle of the rotor and the center of the rotor, the pole arc angle is D, and the angle occupied by the second tooth shoe on the stator circumference is B, and the following relationship is satisfied between B and D: 0.4≤B / D≤0.6.

[0024] In some embodiments,

[0025] In the projection plane of the axial end face of the stator, the thickness of the tooth shoe insulator is greater than the thickness of the slot insulator, the thickness of the tooth shoe insulator is set to A, the thickness of the slot insulator is set to C, A and C satisfy the following relationship: A / C≥2; one end of the slot insulator is connected to the tooth shoe insulator, and the other end of the slot insulator is connected to the tooth shoe insulator.

[0026] In some embodiments,

[0027] The width of the second bending portion of the tooth shoe insulator in the circumferential direction is greater than the circumferential width of the first tooth shoe, so that the circumferential width of the interval between two opposite second bending portions is smaller than the circumferential width of the interval between two opposite first tooth shoes.

[0028] In some embodiments,

[0029] The radial inner end of the first protrusion does not exceed the radial inner wall of the second tooth shoe opposite thereto, and the radial inner end of the second protrusion does not exceed the radial inner wall of the second tooth shoe opposite thereto.

[0030] In some embodiments,

[0031] The third edge is in contact with the side edge; and / or the fourth edge of the third protrusion is located on the same circle as the inner circle of the stator.

[0032] In some embodiments,

[0033] The spacing distance between the third edge and the circumferential side wall of the first tooth shoe is E, the width of the third protrusion along the circumferential direction is F, and the following relationship is satisfied between E and F: 0.4≤E / F≤0.8.

[0034] In some embodiments,

[0035] There is a distance G between the bottom edge of the recess of the magnetic conductive component and the second edge, the width of the second bending portion of the tooth shoe insulator along the radial direction is set to H, the width of the first tooth shoe along the radial direction is set to I, and the following relationship is satisfied between G, I and H: 0.3≤H / (G+I)≤0.5.

[0036] The present invention also provides a permanent magnet synchronous motor, which comprises the aforementioned stator and rotor, wherein the stator is located on the outer periphery of the rotor.

[0037] The stator of a permanent magnet synchronous motor and the permanent magnet synchronous motor provided by the present invention have the following beneficial effects:

[0038] 1. The present invention has a smaller circumferential width of the portion of the stator tooth portion relatively close to the stator yoke portion, a larger circumferential width of the portion of the stator tooth portion relatively close to the inner circle of the stator, a circumferential width of the stator tooth shoe greater than the circumferential width of the stator tooth body, and along the radial outward direction of the stator, the stator tooth shoe includes a first tooth shoe and a second tooth shoe connected to each other, the first tooth shoe is located at the radial innermost side, and the circumferential width of the first tooth shoe is greater than the circumferential width of the second tooth shoe, so as to form a radial step tooth structure. The present invention forms a transition portion connecting the first tooth shoe and the tooth body by arranging the second tooth shoe, and the transition portion is preferably made of silicon steel sheet material, which can increase the tooth permeability, can adjust the size of the permeability of the stator slot and the corresponding portion of the stator tooth portion during the rotation of the motor, improve the air gap magnetic density waveform, reduce the back electromotive force harmonics of the motor, and reduce the harmonic noise. That is, the present invention brings about the tooth slot effect by changing the structural characteristics of the stator tooth slot as mentioned above, which can The invention improves the magnetic resistance distribution at various places of the motor magnetic circuit, improves the direction of the magnetic flux, reduces the back electromotive force harmonics of the motor, reduces the electromagnetic force peak of the motor, and reduces the electromagnetic vibration noise of the motor; and the invention provides windings, slot insulation, tooth shoe insulation, and magnetic conductive components in the stator slots, the inner surface of the tooth shoe insulation is attached to the end surface of the tooth shoe, and the magnetic conductive components are attached to the outer surface of the tooth shoe insulation. At the same time, tooth shoes of unequal width, tooth shoe insulation, and magnetic conductive components are stacked in sequence, and the tooth shoe insulation isolates the tooth shoe and the magnetic conductive components, so that there is a non-magnetic conductive distance between the tooth shoe and the magnetic conductive components, the first and second protrusions of the magnetic conductive component are close to the first tooth shoe, and the third protrusion of the magnetic conductive component is placed in the slot and close to the inner circle of the stator. On the one hand, the magnetic flux is guided to pass through the magnetic conductive components, and on the other hand, the magnetic flux closed by the magnetic conductive components is controlled by the tooth shoe insulation, thereby reducing the stator slot effect, reducing the slot torque, improving the control accuracy and running stability, reducing the air gap magnetic density harmonics of the motor, and reducing the electromagnetic vibration and noise of the motor.

[0039] 2. The present invention also sets the angle occupied by the second tooth shoe on the stator circumference to B and the pole arc angle to D to satisfy the relationship: 0.4≤B / D≤0.6. The wider the pole arc, the greater the tooth magnetic density, the greater the difference in corresponding magnetic density between the tooth and the slot, the more obvious the tooth slot effect, and the greater the waveform distortion. Therefore, the present invention sets the second tooth shoe to have the above-mentioned corresponding relationship with the pole arc angle, which can further increase the tooth magnetic permeance, further effectively adjust the size of the magnetic permeance of the corresponding part of the stator slot and the stator tooth during the rotation of the motor, improve the air gap magnetic density waveform, reduce the back electromotive force harmonics of the motor, and reduce harmonic noise.

[0040] 3. The present invention also sets the thickness of the tooth shoe insulation part to A, sets the thickness of the slot insulation part to C, and A and C satisfy the following relationship: A / C≥2, which can reduce the effective slot insulation thickness, increase the effective slot area of ​​the stator slot, help increase the conductor area, increase the thickness of the tooth shoe insulation part, reduce the leakage of the stator tooth shoe and slot magnetic conductive parts, and ensure the effective magnetic flux and output torque of the motor.

[0041] 4. The present invention also leaves an air gap by ensuring that the third edge of the side of the third protrusion of the magnetic conductive component does not contact the side end surface of the second tooth shoe. The distance of the air gap is set to E, and the width of the third protrusion is set to F. E and F should satisfy the following relationship: 0.4≤E / F≤0.8. Air is a non-magnetic medium with a large magnetic resistance. The magnetic resistance of the magnetic conductive component is small. The magnetic conductive component is set in this interval to improve the magnetic resistance of various places on the surface of the stator and rotor air gap, improve the direction of the magnetic flux transmitted from the rotor magnetic flux to the stator teeth, and guide the magnetic flux to form a main magnetic flux closed loop along the third protrusion of the magnetic conductive component, the air gap, the second tooth shoe, the stator tooth body, and the stator yoke. At the same time, the air gap is set in this interval to control the size of the magnetic flux of the magnetic circuit closure, reduce the tooth slot effect caused by the stator slot, reduce the motor tooth slot torque, reduce the motor torque pulsation, improve the control accuracy and running stability of the motor, and reduce the electromagnetic vibration and noise of the motor.

[0042] 5. The present invention also provides a distance between the bottom edge of the recess of the magnetic conductive component and the second edge, and the distance is set to G. The width of the second bent portion of the tooth shoe insulator is set to H, and the width of the second tooth shoe is set to I. G, I and H should satisfy the following relationship: 0.3≤H / (G+I)≤0.5. The tooth shoe insulator is non-magnetic and has a small magnetic permeability. The trunk of the magnetic conductive component is made of magnetic conductive material and has a large magnetic permeability. The second tooth shoe is made of silicon steel sheet material and has a large magnetic permeability. Through this spacing arrangement structure, the magnetic resistance at the positions of the first and second tooth shoes in the magnetic circuit is adjusted, and the magnetic flux is guided to form a main magnetic flux closed loop along the third protrusion, the trunk, the first and second protrusions, the first tooth shoe, the stator tooth body, and the stator yoke of the magnetic conductive component. At the same time, the tooth shoe insulator is arranged in this interval to control the size of the magnetic flux of the magnetic circuit closure, reduce the motor tooth slot torque, reduce the air gap magnetic density harmonics, and reduce the motor vibration noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a top view of the stator and rotor structure of the permanent magnet synchronous motor according to Embodiment 1 of the present invention;

[0044] Figure 2 yes Figure 1 A partial enlarged view of part B (schematic diagram of the stator slot structure of the new motor);

[0045] Figure 3 yes Figure 2 A partial enlarged view of the magnetic conductive component and the tooth shoe insulating component;

[0046] Figure 4 It is a structural schematic diagram of the magnetic conductive component of the novel motor of the present invention;

[0047] Figure 5 It is a structural schematic diagram of the tooth shoe insulation part of the novel motor of the present invention;

[0048] Figure 6It is a comparison curve diagram of the cogging torque of the permanent magnet synchronous motor of the present invention and the conventional motor (corresponding to the stepped tooth structure + slot insulator, tooth shoe insulator and magnetic conductive component);

[0049] Figure 7 It is a comparative bar graph of the noise of the permanent magnet synchronous motor of the present invention and the traditional motor (corresponding to the overall solution of the new motor of the present invention).

[0050] The reference numerals are:

[0051] 1. stator tooth; 2. stator yoke; 3. stator inner circle; 4. stator tooth body; 5. stator tooth shoe; 6. first tooth shoe; 7. second tooth shoe; 8. stator slot; 81. stator slot one; 82. stator slot two; 9. slot insulator; 10. tooth center line; 11. tooth shoe insulator; 111. tooth shoe insulator one; 112. tooth shoe insulator two; 113. first bending portion; 114. second bending portion; 115. inner surface; 116. outer surface; 117. side edge; 12. magnetic conductive component; 120. trunk; 121. first convex portion; 122. second convex portion part; 123, third convex part; 124, first edge; 125, second edge; 126, third edge; 127, fourth edge; 128, top; 129, concave part; 130, bottom edge of concave part; 16, notch; 17, winding; 18, spacing hole; 19, tooth shoe groove; 100, stator; 200, rotor; 101, first slot wall; 102, second slot wall; 103, third slot wall; 104, fourth slot wall; 105, fifth slot wall; 106, sixth slot wall; 107, seventh slot wall; 108, eighth slot wall; 109, ninth slot wall. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] 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.

[0054] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. 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, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded 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, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0055] In the description of the present invention, it is necessary to understand 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. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0056] 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.

[0057] 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. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0058] like Figure 1-7 As shown, the present invention provides a stator of a permanent magnet synchronous motor, which includes:

[0059] A stator tooth portion 1 and a stator yoke portion 2, wherein the stator tooth portion 1 is connected to the stator yoke portion 2 in the radial direction of the stator, and there are N stator tooth portions 1 in the circumferential direction (preferably, the circumferential width of the portion of the stator tooth portion 1 relatively close to the stator yoke portion 2 is small, and the circumferential width of the portion of the stator tooth portion 1 relatively close to the stator inner circle 3 (the stator inner circle is the radial inner circumference of the stator) is large), the stator tooth portion 1 includes a stator tooth body 4 and a stator tooth shoe 5 connected in the radial direction, the circumferential width of the stator tooth shoe 5 is greater than the circumferential width of the stator tooth body 4, and along the radial outward direction of the stator, the stator tooth shoe 5 includes a first tooth shoe 6 and a second tooth shoe 7 connected, the first tooth shoe 6 is located at the radial innermost side, and the circumferential width of the first tooth shoe 6 is greater than the circumferential width of the second tooth shoe 7, so as to form a stepped tooth structure in the radial direction;

[0060] There is a stator slot 8 between two adjacent stator teeth 1, and the stator slot 8 includes a stator slot 1 81 circumferentially opposite to the stator tooth body 4 and a stator slot 2 82 circumferentially opposite to the second tooth shoe 7. A slot insulator 9 is provided on the slot wall of the stator slot 1 81, and a tooth shoe insulator 11 is provided on the slot wall of the stator slot 2 82. A magnetic conductive component 12 is also provided on the tooth shoe insulator 11, and the magnetic conductive component 12 extends toward the inner circle of the stator.

[0061] The present invention has a smaller circumferential width of the stator tooth portion relatively close to the stator yoke portion, a larger circumferential width of the stator tooth portion relatively close to the inner circle of the stator, a circumferential width of the stator tooth shoe greater than the circumferential width of the stator tooth body, and along the radial outward direction of the stator, the stator tooth shoe includes a first tooth shoe and a second tooth shoe connected to each other, the first tooth shoe is located at the radial innermost side, and the circumferential width of the first tooth shoe is greater than the circumferential width of the second tooth shoe, so as to form a radial stepped tooth structure. The present invention forms a transition portion connecting the first tooth shoe and the tooth body by arranging the second tooth shoe, and the transition portion is preferably made of silicon steel sheet material, which can increase the tooth permeability, can adjust the size of the permeability of the stator slot and the corresponding part of the stator tooth portion during the rotation of the motor, improve the air gap magnetic density waveform, reduce the back electromotive force harmonics of the motor, and reduce the harmonic noise. That is, the present invention changes the stator by the above-mentioned The tooth slot structure characteristics bring about the tooth slot effect, which can improve the magnetic resistance distribution at various parts of the motor magnetic circuit, improve the direction of magnetic flux, reduce the back electromotive force harmonics of the motor, reduce the electromagnetic force peak of the motor, and reduce the electromagnetic vibration noise of the motor; and the present invention provides windings, slot insulation, tooth shoe insulators, and magnetic conductive components in the stator slots. The inner surface of the tooth shoe insulator is attached to the end surface of the tooth shoe, and the magnetic conductive component is attached to the outer surface of the tooth shoe insulator. At the same time, tooth shoes of unequal width, tooth shoe insulators, and magnetic conductive components are stacked in sequence. The tooth shoe insulator isolates the tooth shoe and the magnetic conductive component, so that there is a non-magnetic conductive distance between the tooth shoe and the magnetic conductive component. The first and second convex parts of the magnetic conductive component are close to the first tooth shoe, and the third convex part of the magnetic conductive component is placed in the slot and close to the inner circle of the stator. On the one hand, the magnetic flux is guided to pass through the magnetic conductive component, and on the other hand, the magnetic flux closed by the magnetic conductive component is controlled by the tooth shoe insulator, thereby reducing the stator tooth slot effect and reducing the tooth slot torque (such as Figure 6 As shown), it improves control accuracy and running stability, reduces motor air gap magnetic density harmonics, and reduces motor electromagnetic vibration and noise.

[0062] The present invention relates to a permanent magnet synchronous motor, characterized in that it comprises a stator and a rotor of the permanent magnet synchronous motor, wherein the stator comprises a stator tooth portion, a stator yoke portion, and a winding, and the rotor comprises a rotor core, a permanent magnet slot provided on the rotor core, and a permanent magnet placed in the permanent magnet slot, wherein the permanent magnet is arranged on the rotor core along the circumferential direction of the rotor core; wherein the stator tooth portion is connected to the stator yoke portion, the number of stator teeth is N, the width of the stator tooth portion close to the stator yoke portion is small, the width close to the inner circle of the stator is large, and the stator teeth are arranged on the rotor core along the circumferential direction of the rotor core; The stator tooth shoe comprises a tooth body and a tooth shoe, the width of the stator tooth shoe is greater than the width of the stator tooth body, the stator tooth shoe comprises a first tooth shoe, a second tooth shoe, a third tooth shoe, ... an Mth tooth shoe, the stator tooth shoe has at least two different widths, and the tooth shoe width increases successively from the yoke to the inner circle of the stator, forming a stepped tooth structure; the tooth slot effect brought about by the characteristics of the stator tooth slot structure is improved, the magnetic resistance distribution at various parts of the motor magnetic circuit is improved, the magnetic flux direction is improved, the back electromotive force harmonics of the motor are reduced, the electromagnetic force peak of the motor is reduced, and the electromagnetic vibration noise of the motor is reduced.

[0063] In some embodiments,

[0064] The slot wall of the stator slot 81 includes a first slot wall 101, a second slot wall 102, a third slot wall 103, a fourth slot wall 104 and a fifth slot wall 105, wherein the first slot wall 101 is the radial inner circumferential wall of the stator yoke 2, the second slot wall 102 is the circumferential wall of the stator tooth body 4 on one circumferential side of the stator slot 81, the third slot wall 103 is the radial outer circumferential wall of the second tooth shoe 7 on one circumferential side of the stator slot 81, the fourth slot wall 104 is the circumferential wall of the stator tooth body 4 on the other circumferential side of the stator slot 81, and the fifth slot wall 105 is the radial outer circumferential wall of the second tooth shoe 7 on the other circumferential side of the stator slot 81, and the slot insulator 9 extends from the third slot wall 103 through the second slot wall 102, the first slot wall 101 and the fourth slot wall 104 to the fifth slot wall 105 in sequence.

[0065] This is the preferred arrangement of the slot insulation of the present invention, namely, extending from the third slot wall of the stator slot one through the second slot wall, the first slot wall and the fourth slot wall in sequence to the fifth slot wall, and being able to cover the inner wall of the stator slot one with the maximum length, so as to achieve the maximum insulation effect on the winding.

[0066] In some embodiments,

[0067] A winding 17 is also provided in the stator slot 1 81 . The winding 17 is wound around the outer periphery of the slot insulator 9 , that is, the winding 17 is wound on the stator tooth body 4 through the slot insulator 9 . The slot insulator 9 is located between the stator tooth body 4 and the winding 17 .

[0068] The present invention also preferably arranges a winding in stator slot 1 so that the winding is completely wound around the outer circumference of the slot insulator, and the winding is wound around the stator tooth body through the slot insulator, so that the slot insulator can provide the maximum insulation effect on the winding.

[0069] In some embodiments,

[0070] The slot wall of the stator slot 2 82 includes a sixth slot wall 106, a seventh slot wall 107, an eighth slot wall 108 and a ninth slot wall 109, wherein the sixth slot wall 106 is a circumferential wall of the second tooth shoe 7 on one circumferential side of the stator slot 2 82, the seventh slot wall 107 is a radial outer side wall of the first tooth shoe 6 on one circumferential side of the stator slot 2 82, the eighth slot wall 108 is a circumferential wall of the second tooth shoe 7 on the other circumferential side of the stator slot 2 82, and the ninth slot wall 109 is a radial outer side wall of the first tooth shoe 6 on the other circumferential side of the stator slot 2 82. Towards the outer wall, the tooth shoe insulator 11 includes a tooth shoe insulator 111 respectively connected to the sixth slot wall 106 and the seventh slot wall 107, and a tooth shoe insulator 112 respectively connected to the eighth slot wall 108 and the ninth slot wall 109. The tooth shoe insulator 111 and the tooth shoe insulator 112 are spaced apart in the circumferential direction to form a spacing hole 18, so that the magnetic conductive component 12 is penetrated from the radial outer side of the tooth shoe insulator 11 through the spacing hole 18 to the radial inner side of the tooth shoe insulator 11.

[0071] This is the preferred structural form of the stator slot two and the preferred structural form of the tooth shoe insulator of the present invention, that is, the tooth shoe insulator is divided into two parts, one part is arranged in the stator slot two on one circumferential side, and the other part is arranged in the stator slot two on the other circumferential side. There is a spacing hole between the two tooth shoe insulators to accommodate the magnetic conductive component to pass therethrough, and the magnetic flux can be guided to pass through the magnetic conductive component. At the same time, the magnetic flux closed by the magnetic conductive component is controlled by the tooth shoe insulator, thereby reducing the stator tooth slot effect and reducing the tooth slot torque.

[0072] In some embodiments,

[0073] In the projection plane of the axial end face of the stator, the tooth shoe insulator 1 111 and the tooth shoe insulator 2 112 are both "L"-shaped structures, and both include a first bent portion 113 that is in contact with the circumferential wall of the second tooth shoe 7 and a second bent portion 114 that is in contact with the radial outer wall of the first tooth shoe 6, the surface of the first bent portion 113 that is in contact with the second tooth shoe 7, and the surface of the second bent portion 114 that is in contact with the first tooth shoe 6 are both inner surfaces 115, the surface of the first bent portion 113 that is away from the second tooth shoe 7, and the surface of the second bent portion 114 that is away from the first tooth shoe 6 are both outer surfaces 116, and the circumferential side of the second bent portion 114 facing the spacing hole 18 is a side edge 117.

[0074] This is a further preferred structural form of the tooth shoe insulator 1 and the tooth shoe insulator 2 of the present invention, that is, it is formed into a structure including a first bending portion and a second bending portion, which can be effectively fitted with the second tooth shoe and the first tooth shoe respectively, further improving the insulation effect, and the surface fitted with the tooth shoe is the inner surface, and the surface fitted with the magnetic conductive component is the outer surface.

[0075] The tooth shoe insulating member of the present invention preferably adopts non-magnetic insulating material. Two insulating members are arranged in each slot, which are respectively attached to the left and right tooth shoes. The tooth shoe insulating member is bent and has a first bending portion and a second bending portion. The inner surface of the first bending portion is in contact with the side end surface of the first tooth shoe, and the inner surface of the second bending portion is in contact with the upper end surface of the second tooth shoe. The insulating members are attached to the surfaces of the stepped tooth shoes of different widths. Since the distance between the left and right tooth shoes is small, and the closer to the inner circle of the stator, the smaller the distance, leakage magnetic flux is easily generated. Non-magnetic insulating members are added to the side end surface of the first tooth shoe and the upper end surface of the second tooth shoe to reduce the leakage magnetic flux caused by the magnetic conductive components arranged at the center line of the slot. At the same time, the insulating members support and fix the magnetic conductive components.

[0076] In some embodiments,

[0077] The magnetic conductive component 12 includes a main body 120, a first protrusion 121, a second protrusion 122 and a third protrusion 123. The radial inner side of the main body 120 is respectively connected to the outer surface 116 of the second bending portion 114 of the tooth shoe insulator 111 and the outer surface 116 of the second bending portion 114 of the tooth shoe insulator 112. The first protrusion 121 is connected to one circumferential end of the main body 120 and protrudes radially outward. The first protrusion 121 is also connected to the tooth shoe insulator 111. The outer surface 116 of the first bent portion 113 of the main trunk 11 is connected, the second protrusion 122 is connected to the other circumferential end of the main trunk 120 and protrudes radially outward, the second protrusion 122 is connected to the outer surface 116 of the first bent portion 113 of the tooth shoe insulator 112, the third protrusion 123 is connected to the radial inner end of the main trunk 120 and protrudes radially inward, and the third protrusion 123 is inserted from the spacing hole 18 to the slot 16 between two adjacent first tooth shoes 6.

[0078] This is the preferred structural form of the magnetic conductive component of the present invention. The main trunk extending in the circumferential direction can increase the magnetic conductive area in the circumferential direction. The first and second protrusions extending in the radial direction can increase the magnetic conductive area in the radial direction. The third protrusion can guide the magnetic flux from the radial outer peripheral side to the radial inner peripheral side, and guide it to the inner circle of the stator through the slot.

[0079] The space enclosed by the stator teeth and the stator yoke of the present invention is set as a stator slot, and a winding, a slot insulation, a tooth shoe insulation part, and a magnetic conductive part are arranged in the stator slot. The stator winding is wound on the stator teeth, the slot insulation is attached to the bottom of the stator slot, the inner surface of the tooth shoe insulation part is attached to the end face of the tooth shoe, and the magnetic conductive part is attached to the outer surface of the tooth shoe insulation part. On the one hand, the magnetic flux is guided to pass through the magnetic conductive part, and on the other hand, the magnetic flux closed by the magnetic conductive part is controlled by the tooth shoe insulation part, so as to improve the tooth slot effect brought by the structural characteristics of the stator tooth slot, reduce the tooth slot torque, reduce the torque pulsation, and improve the control accuracy and running stability of the motor. At the same time, tooth shoes of unequal width, tooth shoe insulation parts, and magnetic conductive parts are stacked in sequence, and the tooth shoe insulation parts isolate the tooth shoe from the magnetic conductive part, so that there is a non-magnetic conductive distance between the tooth shoe and the magnetic conductive part, which reduces the magnetic flux closed by the stator tooth shoe, reduces the leakage magnetic flux of the tooth shoe magnetic flux path, improves the magnetic conductivity of each part of the motor magnetic circuit, reduces the air gap magnetic density harmonic of the motor, and reduces the electromagnetic vibration and noise of the motor.

[0080] In some embodiments,

[0081] The surface where the first protrusion 121 contacts the outer surface 116 of the first bending portion 113 of the first tooth shoe insulator 111, and the surface where the second protrusion 122 contacts the outer surface 116 of the first bending portion 113 of the second tooth shoe insulator 112 are both first edges 124;

[0082] The radial inner side surface of the trunk 120 is the second edge 125; the circumferential side surface of the third protrusion 123 is the third edge 126, the radial inner side surface of the third protrusion 123 is the fourth edge 127, the radial outer end of the first protrusion 121 protrudes from the trunk 120 to form a top 128, the radial outer end of the second protrusion 122 protrudes from the trunk 120 to also form a top 128, the radial outer edge of the trunk 120 and the first protrusion 121 and the second protrusion 122 form a recess 129, and the radial outer edge of the trunk 120 is the bottom edge 130 of the recess.

[0083] This is a further preferred structural form of the magnetic conductive component of the present invention, that is, the first and second protrusions form a first edge that fits with the first bent portion of the tooth shoe insulator, the trunk forms a second edge that fits with the second bent portion of the tooth shoe insulator, the third protrusion forms a third edge that fits with the second bent portion, and the fourth edge is used to extend to the slot.

[0084] The magnetic conductive component of the present invention preferably uses a magnetic conductive material. The magnetic conductive component is provided with a recessed portion near the outer circle of the stator, and convex portions are provided on the left and right sides of the recessed portion, which are respectively a first convex portion and a second convex portion. The lower ends of the recessed portion, the first convex portion and the second convex portion are the main body of the magnetic conductive component. The second convex portion is close to the side end surface of the second tooth shoe. The main body of the magnetic conductive component is provided with a third convex portion near the inner circle of the stator. The third convex portion is located between the slots formed by the first tooth shoe, thereby reducing the stator tooth slot effect, reducing the motor tooth slot torque, and reducing the motor torque pulsation. The edge of the first convex portion near the inner circle of the stator is set as the first and second edges, the edge of the third convex portion near the inner circle of the stator is set as the third and fourth edges, and the fourth edge is closest to the inner circle of the stator. The magnetic conductive component is used to increase the magnetic permeability at the slot, further reduce the tooth slot effect, reduce the air gap magnetic flux harmonics, and reduce the electromagnetic force peak and noise.

[0085] In some embodiments,

[0086] The angle occupied by the second tooth shoe 7 on the stator circumference is smaller than the pole arc angle, wherein the pole arc angle is the angle formed by the two side edges of the permanent magnet under each pole opposite to the outer circle of the rotor and the lines connecting the center of the rotor circle, the pole arc angle is D, and the angle occupied by the second tooth shoe 7 on the stator circumference is B, and the following relationship is satisfied between B and D: 0.4≤B / D≤0.6.

[0087] The present invention also sets the angle B occupied by the second tooth shoe on the stator circumference and the pole arc angle D to satisfy the relationship: 0.4≤B / D≤0.6. The wider the pole arc, the greater the tooth magnetic density, the greater the difference in corresponding magnetic density between the tooth and the slot, the more obvious the tooth slot effect, and the greater the waveform distortion. Therefore, the present invention sets the second tooth shoe to have the above-mentioned corresponding relationship with the pole arc angle, which can further increase the tooth magnetic permeance, further effectively adjust the size of the magnetic permeance of the corresponding part of the stator slot and the stator tooth during the rotation of the motor, improve the air gap magnetic density waveform, reduce the back electromotive force harmonics of the motor, and reduce harmonic noise.

[0088] The stator tooth portion of the present invention comprises a tooth body and a tooth shoe, wherein the stator tooth shoe has at least two places with different widths, and the tooth shoe width increases in sequence from the yoke to the inner circle of the stator, forming a stepped tooth structure; the angle occupied by the second tooth shoe on the stator circumference is smaller than the pole arc angle, wherein the pole arc angle is the angle formed by the line connecting the edges of the two sides of the permanent magnet under each pole close to the outer circle of the rotor and the center of the circle, the angle occupied by the second tooth shoe on the stator circumference is B, the pole arc angle is D, and B and D should satisfy the following relationship: 0.4≤B / D≤0.6; the wider the pole arc, the greater the tooth magnetic density, the greater the difference in the corresponding magnetic density between the tooth and the slot, the more obvious the tooth slot effect, and the second tooth shoe corresponding to the pole arc angle is added, the second tooth shoe is a transition part connecting the first tooth shoe and the tooth body, the transition part is made of silicon steel sheet material, can increase the tooth magnetic permeability, can adjust the magnetic permeability of the stator slot and the corresponding part of the stator tooth during the rotation of the motor, improve the air gap magnetic density waveform, reduce the back electromotive force harmonic of the motor, and reduce harmonic noise.

[0089] In some embodiments,

[0090] In the projection plane of the axial end face of the stator, the thickness of the tooth shoe insulator 11 is greater than the thickness of the slot insulator 9, the thickness of the tooth shoe insulator 11 is set to A, the thickness of the slot insulator 9 is set to C, A and C satisfy the following relationship: A / C≥2; one end of the slot insulator 9 is connected to the tooth shoe insulator 11, and the other end of the slot insulator 9 is connected to the tooth shoe insulator 11.

[0091] The tooth shoe insulator of the present invention is preferably integrally formed, with uniform thickness everywhere. The thickness of the tooth shoe insulator is greater than the thickness of the slot insulation. The thickness of the tooth shoe insulator is set to A (the thickness is the dimension from the inner wall to the outer wall of the tooth shoe insulator in the above-mentioned projection plane), and the thickness of the slot insulation is set to C (the thickness is the dimension from the inner wall to the outer wall of the slot insulator in the above-mentioned projection plane). A and C should satisfy the following relationship: A / C≥2. Reducing the slot insulation thickness increases the effective slot area of ​​the stator slot, which helps to increase the conductor area, increase the thickness of the tooth shoe insulator, reduce the leakage of the stator tooth shoe and the slot magnetic conductive components, and ensure the effective magnetic flux and output torque of the motor.

[0092] In some embodiments,

[0093] The width of the second bending portion 114 of the tooth shoe insulator 11 in the circumferential direction is greater than the circumferential width of the first tooth shoe 6 , so that the circumferential width between two opposite second bending portions 114 is smaller than the circumferential width between two opposite first tooth shoes 6 .

[0094] Through the arrangement of the above-mentioned structure, the present invention can make the second bent portion of the tooth shoe insulation extend along the upper end surface of the first tooth shoe, that is, the width of the second bent portion is greater than the width of the first tooth shoe, so that there is an air magnetic barrier in the extension direction of the second bent portion toward the center of the stator, thereby increasing the magnetic resistance of the closed magnetic circuit through the tooth shoe and reducing leakage magnetic flux.

[0095] In some embodiments,

[0096] The radial inner end of the first protrusion 121 does not exceed the radial inner wall of the second tooth shoe 7 opposite thereto, and the radial inner end of the second protrusion 122 does not exceed the radial inner wall of the second tooth shoe 7 opposite thereto.

[0097] The present invention can ensure that the top ends of the first and second convex parts close to the outer circle of the stator are not higher than the upper end surface of the second tooth shoe through the above arrangement, thereby ensuring the effective slot area of ​​the stator, ensuring the motor efficiency and reducing the cogging effect.

[0098] In some embodiments,

[0099] The third edge 126 is in contact with the side edge 117 ; and / or the fourth edge 127 of the third protrusion 123 and the stator inner circle 3 are located on the same circle.

[0100] The present invention has a first edge of the magnetic conductive component being fitted with the outer surface of the first bent portion of the tooth shoe insulator, a second edge of the magnetic conductive component being fitted with the outer surface of the second bent portion of the tooth shoe insulator, and a third edge of the magnetic conductive component being fitted with the side edge of the second bent portion of the tooth shoe insulator close to the center line of the slot, so that the tooth shoe and the magnetic conductive component are isolated by the non-magnetic conductive insulating component, and the tooth shoe insulator supports the magnetic conductive component;

[0101] The present invention also enables the third protrusion of the magnetic conductive component to protrude toward the rotor side by locating the fourth edge of the third protrusion and the inner circle of the stator on the same circle, and the inner edge of the third protrusion coincides with the inner circle of the stator. The closer the third protrusion is to the rotor, the more it can guide the magnetic flux to be conducted through the third protrusion, thereby further reducing the cogging effect and reducing the cogging torque.

[0102] In some embodiments,

[0103] The spacing distance between the third edge 126 and the circumferential side wall of the first tooth shoe 6 is E, the width of the third protrusion 123 along the circumferential direction is F, and E and F satisfy the following relationship: 0.4≤E / F≤0.8.

[0104] The present invention preferably has the third edge of the side of the third protrusion of the magnetic conductive component not in contact with the side end surface of the first tooth shoe, leaving an air gap. The distance of the air gap is set to E, and the width of the third protrusion is set to F. E and F should satisfy the following relationship: 0.4≤E / F≤0.8. Air is a non-magnetic medium with a large magnetic resistance. The magnetic resistance of the magnetic conductive component is small. It is set in this interval to improve the magnetic resistance of various places on the surface of the stator and rotor air gap, improve the direction of the magnetic flux transmitted from the rotor magnetic flux to the stator teeth, and guide the magnetic flux to form a main magnetic flux closed loop along the third protrusion of the magnetic conductive component, the air gap, the first tooth shoe, the stator tooth body, and the stator yoke. At the same time, the air gap is set in this interval to control the size of the magnetic flux of the magnetic circuit closure, reduce the tooth slot effect caused by the stator slotting, reduce the motor tooth slot torque, reduce the motor torque pulsation, improve the control accuracy and running stability of the motor, and reduce the electromagnetic vibration and noise of the motor.

[0105] In some embodiments,

[0106] There is a distance G between the bottom edge 130 of the recess of the magnetic conductive component 12 and the second edge 125, the width of the second bending portion 114 of the tooth shoe insulator in the radial direction is set to H, the width of the first tooth shoe 6 in the radial direction is set to I, and the following relationship is satisfied among G, I and H: 0.3≤H / (G+I)≤0.5.

[0107] In the present invention, there is preferably a distance between the bottom edge of the recess of the magnetic conductive component and the second edge, and the distance is set to G, the width of the second bending portion of the tooth shoe insulating part is set to H, and the width of the first tooth shoe is set to I. G, I and H should satisfy the following relationship: 0.3≤H / (G+I)≤0.5, the tooth shoe insulating part is not magnetic and its magnetic permeability is small, the trunk of the magnetic conductive component is a magnetic conductive material and its magnetic permeability is large, and the first tooth shoe is a silicon steel sheet material and its magnetic permeability is large. Through this spacing arrangement structure, the magnetic resistance at the positions of the first and second tooth shoes in the magnetic circuit is adjusted, and the magnetic flux is guided along the third protrusion, the trunk, the first and second protrusions, the second tooth shoe, the stator tooth body, and the stator yoke of the magnetic conductive component to form a main magnetic flux closed loop. At the same time, the tooth shoe insulating part is arranged in this interval to control the size of the magnetic flux of the magnetic circuit closure, reduce the motor tooth slot torque, reduce the air gap magnetic density harmonics, and reduce the motor vibration noise.

[0108] The present invention further provides a permanent magnet synchronous motor, which comprises the aforementioned stator 100 and rotor 200, wherein the stator 100 is located at the outer periphery of the rotor 200, and the motor has low cogging torque and low vibration noise.

[0109] The present invention relates to a permanent magnet synchronous motor, which comprises a stator and a rotor of the permanent magnet synchronous motor, wherein the stator comprises a stator tooth portion, a stator yoke portion, and a winding, the stator tooth portion comprises a tooth body and a tooth shoe, the stator tooth shoe has at least two different widths, and the tooth shoe width increases in sequence from the yoke portion to the inner circle of the stator, forming a stepped tooth structure; the stator slot is provided with a winding, a slot insulation, a tooth shoe insulation part, and a magnetic conductive part, the inner surface of the tooth shoe insulation part is attached to the end surface of the tooth shoe, the magnetic conductive part is attached to the outer surface of the tooth shoe insulation part, and at the same time, the tooth shoes of unequal widths and the tooth shoe insulation part are The edge parts and the magnetic conductive parts are stacked in sequence, the tooth shoe insulating part isolates the tooth shoe and the magnetic conductive part, so that there is a non-magnetic distance between the tooth shoe and the magnetic conductive part, the first and second convex parts of the magnetic conductive part are close to the first tooth shoe, and the third convex part of the magnetic conductive part is placed in the slot and close to the inner circle of the stator. On the one hand, the magnetic flux is guided to pass through the magnetic conductive part, and on the other hand, the magnetic flux closed by the magnetic conductive part is controlled by the tooth shoe insulating part, so as to reduce the stator tooth slot effect, reduce the tooth slot torque, improve the control accuracy and running stability, reduce the air gap magnetic density harmonic of the motor, and reduce the electromagnetic vibration and noise of the motor.

[0110] The present invention can effectively solve the following technical problems:

[0111] 1. Solved the problem of large cogging torque of permanent magnet synchronous motor.

[0112] 2. Solve the problem of large harmonics of motor air gap magnetic flux density.

[0113] 3. Solve the problem of poor motor operation stability.

[0114] 4. Solve the problem of large motor vibration and noise.

[0115] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A stator of a permanent magnet synchronous motor, characterized in that: include: A stator tooth portion (1) and a stator yoke portion (2), wherein the stator tooth portion (1) is connected to the stator yoke portion (2) in the radial direction of the stator, and there are N stator tooth portions (1) in the circumferential direction, and the stator tooth portion (1) comprises a stator tooth body (4) and a stator tooth shoe (5) connected in the radial direction, the circumferential width of the stator tooth shoe (5) is greater than the circumferential width of the stator tooth body (4), and along the radial outward direction of the stator, the stator tooth shoe (5) comprises a first tooth shoe (6) and a second tooth shoe (7) connected, the first tooth shoe (6) is located at the radial innermost side, and the circumferential width of the first tooth shoe (6) is greater than the circumferential width of the second tooth shoe (7), so as to form a stepped tooth structure in the radial direction; A stator slot (8) is provided between two adjacent stator tooth portions (1), the stator slot (8) comprising a stator slot 1 (81) circumferentially opposite to the stator tooth body (4) and a stator slot 2 (82) circumferentially opposite to the second tooth shoe (7), a slot insulator (9) being provided on the slot wall of the stator slot 1 (81), a tooth shoe insulator (11) being provided on the slot wall of the stator slot 2 (82), a magnetic conductive component (12) being further provided on the tooth shoe insulator (11), and the magnetic conductive component (12) extending toward the inner circumference of the stator.

2. The stator of the permanent magnet synchronous motor according to claim 1, characterized in that: The slot wall of the stator slot one (81) comprises a first slot wall (101), a second slot wall (102), a third slot wall (103), a fourth slot wall (104) and a fifth slot wall (105), wherein the first slot wall (101) is a radial inner peripheral wall of the stator yoke (2), the second slot wall (102) is a peripheral wall of the stator tooth body (4) on one circumferential side of the stator slot one (81), and the third slot wall (103) is a second tooth shoe (7) on one circumferential side of the stator slot one (81). ), the fourth slot wall (104) is the circumferential wall of the stator tooth body (4) on the other circumferential side of the stator slot one (81), the fifth slot wall (105) is the radial outer wall of the second tooth shoe (7) on the other circumferential side of the stator slot one (81), and the slot insulating member (9) extends from the third slot wall (103) through the second slot wall (102), the first slot wall (101) and the fourth slot wall (104) to the fifth slot wall (105).

3. The stator of the permanent magnet synchronous motor according to claim 1, characterized in that: A winding (17) is also provided in the stator slot one (81), and the winding (17) is wound around the outer periphery of the slot insulating member (9), that is, the winding (17) is wound on the stator tooth body (4) through the slot insulating member (9), and the slot insulating member (9) is located between the stator tooth body (4) and the winding (17).

4. The stator of the permanent magnet synchronous motor according to claim 1, characterized in that: The slot wall of the second stator slot (82) includes a sixth slot wall (106), a seventh slot wall (107), an eighth slot wall (108) and a ninth slot wall (109), wherein the sixth slot wall (106) is a circumferential wall of the second tooth shoe (7) on one circumferential side of the second stator slot (82), the seventh slot wall (107) is a radially outer side wall of the first tooth shoe (6) on one circumferential side of the second stator slot (82), the eighth slot wall (108) is a circumferential wall of the second tooth shoe (7) on the other circumferential side of the second stator slot (82), and the ninth slot wall (109) is a circumferential wall of the first tooth shoe (6) on the other circumferential side of the second stator slot (82). ), the tooth shoe insulator (11) comprises a tooth shoe insulator 1 (111) connected to the sixth slot wall (106) and the seventh slot wall (107) respectively, and a tooth shoe insulator 2 (112) connected to the eighth slot wall (108) and the ninth slot wall (109) respectively, the tooth shoe insulator 1 (111) and the tooth shoe insulator 2 (112) being spaced apart in the circumferential direction to form a spacing hole (18), so that the magnetic conductive component (12) is passed from the radial outer side of the tooth shoe insulator (11) through the spacing hole (18) to the radial inner side of the tooth shoe insulator (11).

5. The stator of the permanent magnet synchronous motor according to claim 4, characterized in that: In the projection plane of the axial end face of the stator, the tooth shoe insulator part 1 (111) and the tooth shoe insulator part 2 (112) are both "L"-shaped structures, and both include a first bent portion (113) abutting against the peripheral wall of the second tooth shoe (7) and a second bent portion (114) abutting against the radial outer wall of the first tooth shoe (6); the surface of the first bent portion (113) abutting against the second tooth shoe (7) and the surface of the second bent portion (114) abutting against the first tooth shoe (6) are both inner surfaces (115); the surface of the first bent portion (113) away from the second tooth shoe (7) and the surface of the second bent portion (114) away from the first tooth shoe (6) are both outer surfaces (116); and the circumferential side surface of the second bent portion (114) facing the spacing hole (18) is a side edge (117).

6. The stator of the permanent magnet synchronous motor according to claim 5, characterized in that: The magnetic conductive component (12) comprises a main body (120), a first protrusion (121), a second protrusion (122) and a third protrusion (123); the radial inner side of the main body (120) is respectively connected to the outer surface (116) of the second bent portion (114) of the tooth shoe insulator (111) and the outer surface (116) of the second bent portion (114) of the tooth shoe insulator (112); the first protrusion (121) is connected to one circumferential end of the main body (120) and protrudes radially outward; the first protrusion (121) is also connected to the tooth shoe insulator (111) The outer surface (116) of the first bent portion (113) of the second tooth shoe insulator (111) is connected to the outer surface (116) of the first bent portion (113) of the second tooth shoe insulator (111), the second protrusion (122) is connected to the other circumferential end of the main body (120) and protrudes radially outward, the second protrusion (122) is connected to the outer surface (116) of the first bent portion (113) of the second tooth shoe insulator (112), the third protrusion (123) is connected to the radial inner end of the main body (120) and protrudes radially inward, and the third protrusion (123) is inserted from the spacing hole (18) to the notch (16) between two adjacent first tooth shoes (6).

7. The stator of the permanent magnet synchronous motor according to claim 6, characterized in that: The surface where the first protrusion (121) is connected to the outer surface (116) of the first bent portion (113) of the tooth shoe insulator (111), and the surface where the second protrusion (122) is connected to the outer surface (116) of the first bent portion (113) of the tooth shoe insulator (112) are both first edges (124); The radial inner side surface of the main trunk (120) is the second edge (125); the circumferential side surface of the third protrusion (123) is the third edge (126); the radial inner side surface of the third protrusion (123) is the fourth edge (127); the radial outer end of the first protrusion (121) protrudes from the main trunk (120) to form a top end (128); the radial outer end of the second protrusion (122) protrudes from the main trunk (120) to also form a top end (128); the radial outer edge of the main trunk (120) and the first protrusion (121) and the second protrusion (122) form a recess (129); the radial outer edge of the main trunk (120) is the bottom edge (130) of the recess.

8. The stator of a permanent magnet synchronous motor according to any one of claims 1 to 7, characterized in that: The angle occupied by the second tooth shoe (7) on the stator circumference is smaller than the pole arc angle, wherein the pole arc angle is the angle formed by the two side edges of the permanent magnet under each pole opposite to the outer circle of the rotor and the lines connecting the center of the rotor circle, the pole arc angle is D, and the angle occupied by the second tooth shoe (7) on the stator circumference is B, and the following relationship is satisfied between B and D: 0.4≤B / D≤0.

6.

9. The stator of a permanent magnet synchronous motor according to any one of claims 1 to 8, characterized in that: In the projection plane of the axial end face of the stator, the thickness of the tooth shoe insulator (11) is greater than the thickness of the slot insulator (9), the thickness of the tooth shoe insulator (11) is set to A, the thickness of the slot insulator (9) is set to C, and A and C satisfy the following relationship: A / C≥2; one end of the slot insulator (9) is connected to the tooth shoe insulator (11), and the other end of the slot insulator (9) is connected to the tooth shoe insulator (11).

10. The stator of the permanent magnet synchronous motor according to claim 5, characterized in that: The width of the second bent portion (114) of the tooth shoe insulator (11) in the circumferential direction is greater than the circumferential width of the first tooth shoe (6), so that the circumferential width of the interval between two opposite second bent portions (114) is smaller than the circumferential width of the interval between two opposite first tooth shoes (6).

11. The stator of the permanent magnet synchronous motor according to claim 6, characterized in that: The radial inner end of the first protrusion (121) does not exceed the radial inner wall of the second tooth shoe (7) opposite thereto, and the radial inner end of the second protrusion (122) does not exceed the radial inner wall of the second tooth shoe (7) opposite thereto.

12. The stator of the permanent magnet synchronous motor according to claim 7, characterized in that: The third edge (126) is in contact with the side edge (117); and / or the fourth edge (127) of the third protrusion (123) and the stator inner circle (3) are located on the same circle.

13. The stator of the permanent magnet synchronous motor according to claim 7, characterized in that: The spacing distance between the third edge (126) and the circumferential side wall of the first tooth shoe (6) is E, the width of the third protrusion (123) along the circumferential direction is F, and the following relationship is satisfied between E and F: 0.4≤E / F≤0.

8.

14. The stator of the permanent magnet synchronous motor according to claim 7, characterized in that: There is a distance G between the bottom edge (130) of the recess of the magnetic conductive component (12) and the second edge (125), the width of the second bent portion (114) of the tooth shoe insulator in the radial direction is set to H, the width of the first tooth shoe (6) in the radial direction is set to I, and the following relationship is satisfied among G, I and H: 0.3≤H / (G+I)≤0.

5.

15. A permanent magnet synchronous motor, characterized in that: The invention comprises a stator (100) and a rotor (200) according to any one of claims 1 to 14, wherein the stator (100) is located on the outer periphery of the rotor (200).

Images