Synchronous motor and compressor using the same

Abstract

The present invention provides a synchronous motor and a compressor, wherein the number of convex teeth is 9, and the 9 convex teeth are arranged at intervals along the circumference of the yoke on the inner side of the yoke, and a tooth shoe is provided at the inner end of the convex tooth; the winding is wound on the convex teeth, and the coils of three adjacent convex teeth in the winding constitute one phase of the winding, the convex teeth are divided into 3 phases, and each coil only crosses one convex tooth, and the three convex teeth constituting one phase include an intermediate convex tooth located in the middle, a first convex tooth and a second convex tooth respectively located on both sides of the intermediate convex tooth, and the second convex tooth, the intermediate convex tooth and the first convex tooth are arranged in sequence according to the rotation direction of the rotor; wherein, the distance between the farthest point of the tooth shoe tip away from the inner diameter of the stator to the farthest point of the tooth shoe connected to the root of the tooth shoe away from the inner diameter of the stator is Ws, the length of the tooth shoe tip is TGD, and the maximum radial thickness dimension of the tooth shoe of the intermediate convex tooth is W1, then: the synchronous motor provided by the present invention can effectively reduce the unbalanced electromagnetic pulling force of the synchronous motor and reduce the vibration noise of the motor.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and more particularly to a synchronous motor and a compressor comprising the synchronous motor. Background Art

[0002] In the existing rotary DC variable frequency compressors using permanent magnet motors, three-phase motors generally use built-in permanent magnet motors, and the stator winding is usually wound on the convex teeth of the motor. The number of magnetic poles of the magnets used in the rotor core is generally 2:3 to the number of stator slots, and the stator teeth (convex teeth) and rotor poles are evenly spaced on the circumference, but due to its low winding coefficient, there is a bottleneck in improving the energy efficiency of the motor. If the motor uses a near-pole slot with a structural unit of 1, it can have a higher winding coefficient, reduce the copper loss of the motor, and effectively improve the efficiency of the motor. However, this type of motor usually has an inherent unbalanced electromagnetic force, which in turn generates vibration noise, making the motor sound poor. The magnetic flux usually travels in the direction of the shortest magnetic path length. If there is magnetic flux passing through the air gap between the stator and rotor of the motor, a radial force distributed along the circumferential direction of the air gap will be generated between the stator and rotor, shortening the effective air gap length it passes through. When the air gap magnetic field is unevenly distributed, the synthetic radial force is not 0, and an unbalanced magnetic pull will be generated at this time. The existence of this force will have many negative effects on the operation of the motor, causing motor vibration and noise, reducing efficiency and shortening service life, etc. The generation of unbalanced magnetic pull is generally believed to be caused by two aspects: the inherent defects of the motor body with specific slot-pole matching and the installation operation during motor processing. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] To this end, an object of a first aspect of the present invention is to provide a synchronous motor.

[0005] A second aspect of the present invention provides a compressor comprising the above-mentioned synchronous motor.

[0006] To achieve the above-mentioned purpose, the technical solution of the first aspect of the present invention provides a kind of fixed synchronous motor, comprising: a stator, a stator winding, and a rotor; the rotor comprises a rotor core, the rotor core comprises a rotor punching and a plurality of magnet slots, all of the magnet slots are distributed at intervals along the circumference of the rotor core, a plurality of the permanent magnets are correspondingly inserted into the plurality of the magnet slots, and the absolute value of the difference between the number of magnetic poles and the number of slots of the rotor is 1; the stator comprises: an annular yoke and convex teeth, the number of the convex teeth is 9, and the 9 convex teeth are arranged on the inner side of the yoke along the yoke. The convex teeth are arranged at circumferential intervals, and the inner ends of the convex teeth are provided with tooth shoes; the stator winding is wound on the convex teeth, the convex teeth are divided into 3 phases, and each coil only crosses one convex tooth, and the three convex teeth constituting one phase include a middle convex tooth located in the middle, and a first convex tooth and a second convex tooth located on both sides of the middle convex tooth respectively; wherein, the distance between the farthest point of the tooth shoe tip away from the inner diameter of the stator and the farthest point of the tooth shoe root away from the inner diameter of the stator is Ws, the length of the tooth shoe tip is TGD, and the maximum radial thickness dimension of the tooth shoe of the middle convex tooth is W1, then:

[0007] The stator provided by the above technical solution of the present invention can effectively reduce the unbalanced electromagnetic pull of the synchronous motor by limiting Ws, W1, and TGD, while ensuring the manufacturability without change, thereby reducing the vibration noise of the motor, improving the hearing experience, and providing a synchronous motor of better quality.

[0008] In addition, the stator provided by the above technical solution of the present invention also has the following additional technical features:

[0009] In the above technical solution, preferably, the second convex tooth, the middle convex tooth and the first convex tooth are arranged in sequence according to the rotation direction of the rotor; the maximum radial thickness dimension of the tooth shoe of the first convex tooth is W2, and the maximum radial thickness dimension of the tooth shoe of the second convex tooth is W3, then: 0.45≤W1 / W2≤1.85, 0.45≤W1 / W3≤1.75.

[0010] W1 / W2 may be, but is not limited to, 0.45, 0.75, 1.00, 1.35, 1.65 or 1.85; W1 / W3 may be, but is not limited to, 0.45, 0.75, 1.00, 1.35, 1.65 or 1.75.

[0011] In the above technical solution, preferably, the minimum radial thickness of the tooth shoe of the middle convex tooth is W1min, 1.4≤W1 / W1min≤3.2.

[0012] As the maximum radial thickness of the tooth shoe of the middle convex tooth changes, the minimum radial thickness of the tooth shoe of the middle convex tooth must also change in the same trend to ensure smooth passage of the magnetic flux and keep the distortion rate of the back electromotive force and air gap magnetic flux waveform within a better range.

[0013] In the above technical solution, preferably, W1 satisfies 2.4mm≤W1≤4.7mm.

[0014] W1 may be, but is not limited to, 2.4 mm, 2.9 mm, 3.4 mm, 3.7 mm, 4.2 mm, or 4.7 mm.

[0015] In the above technical solution, preferably, the width of the convex tooth is Wt, 0.25≤W1 / Wt≤0.85.

[0016] W1 / Wt may be, but is not limited to, 0.25, 0.45, 0.65 or 0.85.

[0017] In the above technical solution, preferably, the tooth boot of the middle convex tooth is asymmetric along the axis of the middle convex tooth, and the tooth boot with an asymmetric shape can also achieve a better back-electromotive force enhancement effect, thereby reducing copper loss and improving efficiency. The specific asymmetry can be that the tooth boot of the middle convex tooth is divided into two parts by the axis of the middle convex tooth with different lengths (the central angles corresponding to the two parts) and / or different thicknesses; and / or, the tooth boot of the first convex tooth is asymmetric along the axis of the first convex tooth, and the tooth boot with an asymmetric shape can also achieve a better back-electromotive force enhancement effect, thereby reducing copper loss and improving efficiency. The specific asymmetry can be that the tooth boot of the middle convex tooth is divided into two parts by the axis of the middle convex tooth with different lengths (the central angles corresponding to the two parts) and / or different thicknesses; and / or, the tooth boot of the second convex tooth is asymmetric along the axis of the second convex tooth, and the tooth boot with an asymmetric shape can also achieve a better back-electromotive force enhancement effect, thereby reducing copper loss and improving efficiency. The specific asymmetry can be that the tooth boot of the middle convex tooth is divided into two parts by the axis of the middle convex tooth with different lengths (the central angles corresponding to the two parts) and / or different thicknesses.

[0018] In the above technical solution, preferably, the number of poles of the synchronous motor is equal to 10, that is, the number of magnetic poles of the rotor is 10. Of course, the number of poles of the synchronous motor can also be 8, 12, etc.

[0019] In the above technical solution, preferably, the winding directions of the coils on adjacent convex teeth in one phase are opposite.

[0020] A synchronous motor having 9 protruding teeth, wherein the 9 protruding teeth are divided into 3 phases with every 3 adjacent protruding teeth as 1 phase, that is, each phase of the U phase, the V phase, and the W phase has 3 protruding teeth, each of which includes a middle protruding tooth located in the middle, and a first protruding tooth and a second protruding tooth located on both sides of the middle protruding tooth, respectively. The direction of the coil wound on the middle protruding tooth is opposite to the direction of the coil wound on the first protruding tooth and the second protruding tooth. The windings constituting the U phase are concentrated in the 3 protruding teeth constituting the U phase. Similarly, the windings constituting the V phase are concentrated in the 3 protruding teeth constituting the V phase, and the windings constituting the W phase are concentrated in the 3 protruding teeth constituting the W phase.

[0021] In the above technical solution, preferably, the number of poles of the rotor is 10, forming a 10-pole 9-slot synchronous motor with 9 convex teeth. Through finite element numerical calculation, it can be concluded that for a synchronous motor with a 10-pole rotor, the present invention can have a smaller unbalanced magnetic pull and significantly reduce low-frequency noise.

[0022] In the above technical solution, preferably, the sum of the widths of the permanent magnets under each magnetic pole is bm, the inner diameter of the stator is Di, the number of pole pairs of the rotor is P, and then 0.75≤bm×2P / (π×Di)≤0.9.

[0023] When the width and pole pair number of the permanent magnet satisfy 0.75≤bm×2P / (π×Di)≤0.9, the highest utilization rate of the permanent magnet and the best cost performance can be achieved.

[0024] In the above technical solution, preferably, the rotor is a tangential rotor, and the core area surrounded by adjacent permanent magnets is a magnetic pole.

[0025] In the above technical solution, preferably, the rated torque T of the synchronous motor, the inner diameter Di of the stator and the unit volume torque TPV of the rotor satisfy 5.18×10 -7 ≤T×Di -3 ×TPV -1 ≤1.17×10 -6 , where the unit of the rated torque T is N·m, the unit of the inner diameter Di of the stator is mm, and the unit of the unit volume torque TPV is kN·m·m -3 The value range of the unit volume torque TPV is 5 kN·m·m -3 ≤TPV≤45kN·m·m -3 .

[0026] The value range of the combined variables of the rated torque T of the permanent magnet motor, the inner diameter Di of the stator and the unit volume torque TPV of the rotor is limited, and the value range of the unit volume torque TPV is also limited, so that the permanent magnet motor can meet the power requirements in the compressor field. Accordingly, for the permanent magnet motor and compressor using the stator and rotor, the rotor leakage flux can be effectively reduced, the utilization rate of the permanent magnet is increased, and the motor efficiency is improved.

[0027] In the above technical solution, preferably, the arcs on both sides of the magnetic pole d-axis form a whole arc with the rotation center as the center, the central angle corresponding to the arc is α1, and the pole pitch angle is α2, where α1 / α2≥0.5, and the straight line passing through the symmetry center line of the magnet slot and the center of the rotor is set as the d-axis.

[0028] α1 / α2≥0.5, which can provide sufficient main magnetic flux and meet the manufacturability requirements.

[0029] The technical solution of the second aspect of the present invention provides a compressor, comprising a synchronous motor as described in any one of the technical solutions of the first aspect.

[0030] The compressor provided by the technical solution of the second aspect of the present invention comprises the synchronous motor described in any one of the technical solutions of the first aspect, and thus has all the beneficial effects of the synchronous motor described in any one of the technical solutions of the first aspect, which will not be repeated here.

[0031] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] Figure 1 is a schematic structural diagram of a stator according to an embodiment of the present invention;

[0034] Figure 2 is a schematic structural diagram of a 10-pole rotor according to an embodiment of the present invention;

[0035] Figure 3 is a schematic structural diagram of a rotor according to an embodiment of the present invention;

[0036] Figure 4 is a schematic structural diagram of a rotor according to another embodiment of the present invention;

[0037] Figure 5 is a schematic structural diagram of a tangential rotor according to an embodiment of the present invention;

[0038] Figure 6is a schematic diagram of a partial structure of a stator according to an embodiment of the present invention, wherein the tooth shoes of the middle convex teeth are asymmetrical;

[0039] Figure 7 is a schematic diagram of a partial structure of a stator according to an embodiment of the present invention, wherein the tooth boots of the first convex teeth and the tooth boots of the second convex teeth are asymmetrical;

[0040] Figure 8 is a table of optimization results of numerical calculation in the present invention;

[0041] Fig. 9 is a table of optimization results of numerical calculation in the present invention;

[0042] Fig.10 It is a schematic cross-sectional structural diagram of a compressor according to an embodiment of the present invention.

[0043] in, Figures 1 to 10 The corresponding relationship between the reference numerals and the component names is as follows:

[0044] 1 stator, 11 yoke, 12 convex teeth, 13 middle convex teeth, 14 first convex teeth, 15 second convex teeth, 16 coil, 17 tooth shoe, 171 tooth shoe root, 172 tooth shoe tip, 2 rotor, 3 permanent magnet, 100 compressor, 10 synchronous motor. DETAILED DESCRIPTION

[0045] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0046] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0047] The following describes a synchronous motor and a compressor according to some embodiments of the present invention with reference to the accompanying drawings.

[0048] like Figure 1As shown, a synchronous motor provided according to some embodiments of the present invention includes: a stator 1, a stator winding, and a rotor 2. The rotor 2 includes a rotor core, and the rotor core includes rotor punchings and magnet slots. All magnet slots are spaced along the circumference of the rotor core, and a plurality of permanent magnets 3 are correspondingly inserted into the plurality of magnet slots. The absolute value of the difference between the number of magnetic poles and the number of slots of the rotor is 1; the stator 1 includes: a yoke 11 and convex teeth 12, the yoke 11 is annular, the number of convex teeth 12 is 9, and the 9 convex teeth 12 are arranged at intervals along the circumference of the yoke 11 on the inner side of the yoke 11, and a tooth shoe 17 is provided at the inner end of the convex tooth 12; the stator winding is wound on the convex teeth 12, and the convex teeth 12 are divided into 3 phases, and each coil 16 only crosses one convex tooth, forming three convex teeth of one phase. 12 includes a middle convex tooth 13 located in the middle, and a first convex tooth 14 and a second convex tooth 15 located on both sides of the middle convex tooth 13; wherein, the distance between the farthest point of the tooth shoe tip 172 away from the inner diameter of the stator and the farthest point of the tooth shoe root 172 away from the inner diameter of the stator is Ws, the farthest point of the tooth shoe tip 172 away from the inner diameter of the stator refers to the point on the tooth shoe tip farthest from the rotation center of the rotor, the farthest point of the tooth shoe root 172 away from the inner diameter of the stator refers to the point on the tooth shoe root farthest from the rotation center of the rotor, the length of the tooth shoe tip 172 is TGD, and the maximum radial thickness dimension of the tooth shoe of the middle convex tooth 13 is W1, then:

[0049] The stator 1 includes an annular yoke 11, convex teeth 12 distributed in the circumferential direction of the yoke 11 with the rotation center as the center, and the convex teeth 12 are located on the inner side of the yoke 11, and the number of the convex teeth 12 is 9. The stator 1 also includes a winding, in which the coils 16 of three adjacent convex teeth 12 constitute one phase of the winding, and each coil 16 only crosses one convex tooth 12. Among the three protruding teeth 12 constituting one phase, the maximum radial thickness of the tooth shoes 17 on the middle protruding tooth 13, the first protruding teeth 14 and the second protruding teeth 15 on both sides satisfy the relationship: the maximum radial thickness dimension W1 of the tooth shoe 17 of the middle protruding tooth 13, the maximum radial thickness dimension W2 of the tooth shoe 17 of the first protruding tooth 14, the maximum radial thickness dimension W3 of the tooth shoe 17 of the second protruding tooth 15, the tooth width of the stator 1 is Wt, and satisfies: 0.45≤W1 / W2≤1.85, 0.45≤W1 / W3≤1.75, 0.25≤W1 / Wt≤0.85, as Figure 8 and Fig. 9 In the figure, the relationship between the maximum radial thickness dimension W1 of the tooth shoe 17 of the middle convex tooth 13, the maximum radial thickness dimension W2 of the tooth shoe 17 of the first convex tooth 14, the maximum radial thickness dimension W3 of the tooth shoe 17 of the second convex tooth 15 and the unbalanced magnetic pull is optimized according to finite element numerical calculation, and the optimal design dimension range is found from a large number of optimization schemes. Among them, along the rotation direction of the rotor, the second convex tooth 15, the middle convex tooth 13 and the first convex tooth 14 are arranged in sequence. Figure 1The direction of rotation of the rotor is counterclockwise.

[0050] It can be, but is not limited to, 0.4, 0.6, 0.8, 1.0, 1.2 or 1.4.

[0051] The rotor structure provided by the present invention can effectively reduce the unbalanced electromagnetic pulling force of the motor, thereby reducing the vibration noise of the motor and improving the hearing experience.

[0052] The rotor is rotatably arranged on the inner side of the protruding teeth 12. The rotor includes a rotor core, and the rotor core includes rotor punchings and magnet slots. The number of magnet slots is at least one, and all magnet slots are spaced along the circumference of the rotor core, and permanent magnets are arranged in the magnet slots. The permanent magnets are in the shape of sheets or arcs, and several permanent magnets are arranged in a plurality of magnet slots in a one-to-one correspondence.

[0053] The number of poles of the motor rotor is 10, but it can also be 8, 12, etc.

[0054] In a synchronous motor with a combination of 10 poles and 9 slots, the windings that make up one phase are arranged in a concentrated manner. Therefore, when current flows into the stator winding, the rotating magnetic field generated generates an uneven electromagnetic force relative to the rotor shaft. A large radial exciting force is generated in the radial direction relative to the shaft. In a 10-pole 9-slot synchronous motor, when the rotor rotates one circle, the exciting force that changes in a sinusoidal wave has a total of 10 cycles. The magnitude of the radial exciting force shows a trend of increasing as the load torque of the synchronous motor increases.

[0055] The present invention has a significant effect on improving the unbalanced magnetic pulling force of a 10-pole motor.

[0056] according to Figure 8 Compared with the initial solution of W1min=1mm, W2min=1mm, W3min=1mm, the unbalanced electromagnetic tension of the final solution is reduced by 71%, and the effect is significant. Among them, W2min is the minimum radial thickness dimension of the first convex tooth, and W3min is the minimum radial thickness dimension of the second convex tooth.

[0057] The minimum radial thickness dimension of the tooth shoe 17 of the middle convex tooth 13 is W1min, and 1.4≤W1 / W1min≤3.2.

[0058] As the maximum radial thickness of the tooth shoe 17 of the middle convex tooth 13 changes, the minimum radial thickness of the tooth shoe 17 of the middle convex tooth 13 must also change in the same trend to ensure smooth passage of the magnetic flux and keep the distortion rate of the back electromotive force and air gap magnetic flux waveform within a better range.

[0059] The size range of W1 is 2.4 mm-4.7 mm, which limits the maximum thickness range of the stator tooth (convex tooth 12) tooth shoe 17 of the compressor 100 motor.

[0060] like Figure 6 As shown, the left and right parts of the tooth shoe 17 of the middle convex tooth 13 in one phase are asymmetrical in shape.

[0061] The asymmetric tooth shoe 17 can also achieve a better back electromotive force enhancement effect, thereby reducing copper loss and improving efficiency. The left and right parts refer to the two parts of the tooth shoe 17 of the middle convex tooth 13 divided by the axis of the middle convex tooth 13.

[0062] like Figure 7 As shown, the left and right parts of the tooth boots 17 of the two convex teeth 12 (the first convex tooth 14 and the second convex tooth 15) located on both sides in one phase are asymmetrical in shape. The left and right parts of the tooth boot 17 of the first convex tooth 14 refer to the two parts of the tooth boot 17 of the first convex tooth 14 divided by the axis of the first convex tooth 14, and the left and right parts of the tooth boot 17 of the second convex tooth 15 refer to the two parts of the tooth boot 17 of the second convex tooth 15 divided by the axis of the second convex tooth 15.

[0063] The asymmetric tooth shoe 17 can also achieve a better back electromotive force enhancement effect, thereby reducing copper loss and improving efficiency.

[0064] The winding directions of adjacent coils 16 in one phase are opposite, which is a unique winding method of this 9-slot motor structure.

[0065] The number of poles of the rotor of the motor is 10. Finite element numerical calculation shows that, for a motor with a 10-pole rotor, the present invention can have a smaller unbalanced magnetic pull and significantly reduce low-frequency noise.

[0066] The ratio of the inner diameter Di to the outer diameter Do of the stator 1 core satisfies 0.51≤Di / Do≤0.57.

[0067] The Di / Do ratio is limited to this range, which can achieve the best cost performance while satisfying the rotational inertia.

[0068] like Figure 5 As shown, the rotor is a tangential rotor, and the core area surrounded by adjacent permanent magnets is the magnetic pole.

[0069] like Figure 3 and Figure 4 As shown, the sum of the widths of the permanent magnets under each magnetic pole is bm, the inner diameter of the stator 1 is Di, the number of pole pairs of the rotor is P, and 0.75≤bm×2P / (π×Di)≤0.9.

[0070] When a magnetic pole includes multiple permanent magnets, bm is the sum of the widths of the multiple permanent magnets. For example, when a magnetic pole includes two permanent magnets, the widths of the two permanent magnets are bm1 and bm2 respectively, and bm is the sum of the widths of the two permanent magnets, that is, bm=bm1+bm2. The sum of the widths of the permanent magnets and the number of pole pairs meet this range, which can achieve the highest utilization rate of the permanent magnets and the best cost performance.

[0071] Each magnetic pole includes two permanent magnets, and each magnetic pole is V-shaped, and the opening angle of the V-shape ranges from 90° to 130°. The angle of the V-shaped permanent magnet meets this range, which can achieve maximum back electromotive force fundamental wave, low winding copper loss and high efficiency.

[0072] like Figure 2 As shown, the arcs on both sides of the magnetic pole d axis form a whole arc with the rotation center as the center. The central angle of the arc is α1, and the pole pitch angle is α2, where α1 / α2≥0.5.

[0073] α1 / α2≥0.5 satisfies this range and can provide sufficient main magnetic flux while meeting manufacturability requirements.

[0074] The rated torque T of the synchronous motor 10, the inner diameter Di of the stator 1, and the unit volume torque TPV of the rotor satisfy 5.18×10 -7 ≤T×Di -3 ×TPV -1 ≤1.17×10 -6 , where the unit of rated torque T is N·m, the unit of inner diameter Di is mm, and the unit of unit volume torque TPV is kN·m·m -3 The value range of unit volume torque TPV is 5kN·m·m -3 ≤TPV≤45kN·m·m -3 .

[0075] In this technical solution, the value range of the combined variables of the rated torque T of the permanent magnet motor, the inner diameter Di of the stator 1 and the unit volume torque TPV of the rotor is limited, and the value range of the unit volume torque TPV is also limited, so that the permanent magnet motor can meet the power requirements in the field of compressor 100. Accordingly, for the permanent magnet motor and compressor 100 using the rotor, the rotor leakage can be effectively reduced, the utilization rate of the permanent magnet is increased, and the motor efficiency is improved.

[0076] like Fig.10 As shown, the embodiment of the second aspect of the present invention provides a compressor 100, comprising a synchronous motor 10 as in any of the above embodiments. Therefore, it has all the beneficial effects of the synchronous motor 10, which will not be described in detail here.

[0077] In summary, the stator 1 provided in the embodiment of the present invention has high back electromotive force and low winding loss. It can improve the motor efficiency when mounted on a synchronous motor and is suitable for a permanent magnet synchronous motor 10. By optimizing the structure of the motor stator 1, the unbalanced electromagnetic force of the motor can be effectively reduced while ensuring the manufacturability without change, thereby suppressing the vibration noise of the motor, thereby providing a permanent magnet motor of better quality.

[0078] In the description of the present invention, unless otherwise clearly specified and limited, the term "plurality" refers to two or more than two; unless otherwise specified or explained, the terms "connection", "fixed" and the like should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] In the description of this specification, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0080] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A synchronous motor, characterized in that: include: Stator, stator winding, rotor; The rotor comprises a rotor core, the rotor core comprises a rotor punching and a plurality of magnet slots, all of the magnet slots are spaced apart along the circumference of the rotor core, a plurality of permanent magnets are correspondingly inserted into the plurality of magnet slots, and the absolute value of the difference between the number of magnetic poles and the number of slots of the rotor is 1; The stator comprises: an annular yoke and convex teeth, wherein the number of the convex teeth is 9, and the 9 convex teeth are arranged at intervals along the circumference of the yoke on the inner side of the yoke, and a tooth shoe is provided at the inner end of the convex teeth; The stator winding is wound on the convex teeth, the convex teeth are divided into three phases, and each coil only crosses one convex tooth, and the three convex teeth constituting one phase include a middle convex tooth located in the middle, and a first convex tooth and a second convex tooth respectively located on both sides of the middle convex tooth; Wherein, the distance between the farthest point of the tooth shoe tip away from the inner diameter of the stator and the farthest point of the tooth shoe root away from the inner diameter of the stator is Ws, the length of the tooth shoe tip is TGD, and the maximum radial thickness dimension of the tooth shoe of the middle convex tooth is W1, then:

2. The synchronous motor according to claim 1, characterized in that: The second convex teeth, the middle convex teeth and the first convex teeth are arranged in sequence according to the rotation direction of the rotor; the maximum radial thickness dimension of the tooth shoe of the first convex teeth is W2, and the maximum radial thickness dimension of the tooth shoe of the second convex teeth is W3, then: 0.45≤W1 / W2≤1.85, 0.45≤W1 / W3≤1.

75.

3. The synchronous motor according to claim 1, characterized in that: The minimum radial thickness of the tooth shoe of the middle convex tooth is W1min, 1.4≤W1 / W1min≤3.

2.

4. The synchronous motor according to claim 1, characterized in that: W1 satisfies 2.4mm≤W1≤4.7mm.

5. The synchronous motor according to claim 1, characterized in that: The width of the convex teeth is Wt, 0.25≤W1 / Wt≤0.

85.

6. The synchronous motor according to any one of claims 1 to 5, characterized in that The tooth shoe of the middle convex tooth is asymmetric along the axis of the middle convex tooth; and / or, The tooth shoe of the first protruding tooth is asymmetric along the axis of the first protruding tooth; and / or, The tooth shoe of the second protruding tooth is asymmetric along the axis of the second protruding tooth.

7. The synchronous motor according to any one of claims 1 to 5, characterized in that The number of poles of the synchronous motor is equal to ten.

8. The synchronous motor according to any one of claims 1 to 5, characterized in that: The winding directions of the coils on adjacent protruding teeth in one phase are opposite.

9. The synchronous motor according to any one of claims 1 to 5, characterized in that: The sum of the widths of the permanent magnets under each magnetic pole is bm, the inner diameter of the stator is Di, and the number of pole pairs of the rotor is P, then 0.75≤bm×2P / (π×Di)≤0.

9.

10. The synchronous motor according to any one of claims 1 to 5, characterized in that The rotor is a tangential rotor, and the iron core area surrounded by adjacent permanent magnets is a magnetic pole.

11. The synchronous motor according to any one of claims 1 to 5, characterized in that: The rated torque T of the synchronous motor, the inner diameter Di of the stator and the unit volume torque TPV of the rotor satisfy 5.18×10 -7 ≤T×Di -3 ×TPV -1 ≤1.17×10 -6 , where the unit of the rated torque T is N·m, the unit of the inner diameter Di of the stator is mm, and the unit of the unit volume torque TPV is kN·m·m -3 The value range of the unit volume torque TPV is 5 kN·m·m -3 ≤TPV≤45kN·m·m -3 .

12. The synchronous motor according to any one of claims 1 to 5, characterized in that The arcs on both sides of the magnetic pole d axis form a whole arc with the rotation center as the center. The central angle of the arc is α1, and the pole pitch angle is α2, where α1 / α2≥0.

5.

13. A compressor, characterized in that: It comprises the synchronous motor as claimed in any one of claims 1 to 12.

Images