Stator core, permanent magnet synchronous motor, compressor and air conditioner

Abstract

The application provides a kind of stator core, permanent magnet synchronous motor, compressor and air conditioner, wherein the stator core includes stator yoke ring, the radially inner circumferential wall of the stator yoke ring is uniformly spaced in its circumferential direction and is provided with a plurality of stator teeth, each of the stator teeth includes a tooth shoe and a connecting column connected between the tooth shoe and the stator yoke ring, two adjacent stator teeth form a stator slot, and the two circumferential tooth shoe side walls of the two tooth shoes of the two adjacent stator teeth respectively extending towards the extension line of one side of the radially inner circumferential wall divide the stator slot into a middle intermediate winding slot and a side side winding slot on the circumferential two sides of the intermediate winding slot, the slot area of the intermediate winding slot is S1, the slot area of the side side winding slot is S2, and 0 < S1 / S2 ≤ 0.537. The application can avoid the situation that the intermediate winding slot area S1 in the stator core is too large, the effective slot area S2 of the stator is reduced, the number of turns of the winding is reduced, and the motor back electromotive force is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of air conditioning, and particularly relates to a stator core, a permanent magnet synchronous motor, a compressor and an air conditioner. BACKGROUND

[0002] With the decrease of the cost of rare earth magnetic steel material, the rare earth permanent magnet synchronous motor is applied more and more widely. The residual magnetism of the rare earth magnetic steel material is larger than that of the ferrite magnetic steel material, and the advantage is obvious when the motor is operated under large working conditions. The motor needs to have certain load capacity under the large working condition.

[0003] The existing rare earth motor technical scheme is unreasonable in the design of the number of turns and the stator slot area. When the wire diameter of the motor scheme winding is unchanged, the number of turns of the winding must be reduced, resulting in the reduction of the motor back electromotive force. When the output power of the motor is the same, the required input current is large, the load capacity of the motor is reduced, and the copper loss of the motor is increased. When the stator slot area of the motor is large, the width of the tooth part of the motor is reduced with the same outer diameter of the stator core, the tooth part magnetic density is increased, and when the tooth part magnetic density is greater than the working magnetic density range of the core, the iron loss of the motor is increased, the efficiency of the motor is reduced, and the performance of the motor is reduced. In order to improve the effective value of the motor back electromotive force and the performance of the motor, the application is provided. SUMMARY

[0004] Therefore, the application provides a stator core, a permanent magnet synchronous motor, a compressor and an air conditioner, which can solve the technical problems that the motor stator slot area design in the prior art is unreasonable, the effective value of the motor back electromotive force is low, and the load capacity and the performance of the motor are low.

[0005] In order to solve the above problems, the application provides a stator core, which comprises a stator yoke ring, a plurality of stator teeth are uniformly and spaced apart in the circumferential direction on the radial inner ring circumferential wall of the stator yoke ring, each stator tooth comprises a tooth shoe and a connecting column connected between the tooth shoe and the stator yoke ring, a stator slot is formed between two adjacent stator teeth, the tooth shoes of the two adjacent stator teeth are close to each other, and the two circumferential tooth shoe side walls of the tooth shoes are respectively extended to the extension line of one side of the radial inner ring circumferential wall, so as to divide the stator slot into a middle winding slot and a side winding slot on the circumferential two sides of the middle winding slot, the slot area of the middle winding slot is S1, the slot area of the side winding slot is S2, and 0

[0006] In some embodiments, S1 / S2≥0.444; and / or, the radial cross-sectional area of the connecting column is S3, and 0.684≤S2 / S3≤0.91.

[0007] In some embodiments, the outer diameter of the stator yoke ring is r, the inner diameter of the stator yoke ring is r2, the radial inner diameter of the toothed shoe is r1, the radial outer diameter of the toothed shoe is r3, the radial inner ring of the stator yoke ring and the radial outer ring are concentric, the radial inner wall of the toothed shoe and the radial outer wall are concentric, and r1 < r3 < r2 < r; and / or, 49 mm ≤ r ≤ 52 mm.

[0008] In some embodiments, 0.56 ≤ r1 / r ≤ 0.58.

[0009] In some embodiments, 6.5 mm ≤ r-r2 ≤ 0.5*(r2-r3) ≤ 7 mm.

[0010] The application also provides a permanent magnet synchronous motor, comprising a motor stator, wherein the motor stator comprises the above-mentioned stator core.

[0011] In some embodiments, the motor stator further comprises a stator winding wound on the stator teeth, and the wire diameter of the stator winding is φ, wherein 0.68 mm ≤ Φ ≤ 0.73 mm.

[0012] In some embodiments, the permanent magnet synchronous motor further comprises a motor rotor, wherein a plurality of magnetic poles are arranged along the circumference of the motor rotor, and a radially magnetized permanent magnet is arranged below each magnetic pole, and the total length of the magnetic poles of the permanent magnet is L, wherein 0.19 ≤ L / S3 ≤ 0.22.

[0013] In some embodiments, the material of the permanent magnet is rare earth.

[0014] The application also provides a compressor comprising the above-mentioned permanent magnet synchronous motor.

[0015] The application also provides an air conditioner comprising the above-mentioned compressor.

[0016] The stator core, the permanent magnet synchronous motor, the compressor and the air conditioner provided by the application have the following beneficial effects:

[0017] Optimizing and limiting S1 / S2 can avoid the situation that the effective slot area S2 of the stator core is reduced, the number of turns of the winding is reduced, and the back electromotive force of the motor is reduced due to the excessive intermediate winding slot area S1, that is, the back electromotive force of the motor is not too low and is at a relatively high level, the motor loss is small, and the motor efficiency and performance are relatively high. When S1 / S2 is greater than 0.537, the back electromotive force of the motor will be too small, which will lead to an increase in motor current and copper loss, and thus an increase in total motor loss and a decrease in motor efficiency and performance. The intermediate winding slot area S1 is prevented from being too small, the width of the winding machine is greater than the distance of the shoe part, the stator cannot be wound by the winding machine, the winding difficulty of the winding is increased, and the motor trial efficiency is reduced.

[0018] The radial cross-sectional area S3 of the connecting column and the effective slot area are reasonably distributed, the utilization rate of the stator core is improved, the effective slot area is not too large to cause the connecting column area to decrease, the width or length of the connecting column to decrease to cause the local magnetic density to increase (i.e. the tooth magnetic density), the motor loss to increase, or the effective slot area to decrease to cause the motor winding number and back electromotive force to decrease too much, and the phenomenon of the motor winding number and back electromotive force to decrease too much to occur is avoided;

[0019] The tooth length is proportional to the stator core slot area, the yoke part and the shoe part radius satisfy the relationship with the stator outer diameter, the certain slot area size is ensured, the unreasonable yoke part and yoke part radius size causing the slot area to be too small and the back electromotive force to decrease is avoided, and the stator core magnetic density is not increased and the motor loss is not increased;

[0020] The winding number is decreased to cause the motor back electromotive force to decrease when the wire diameter is large, the motor loss is increased when the winding wire diameter is small, the motor loss is balanced, and the motor performance is optimized;

[0021] The tooth area S3 is adjusted according to the rotor magnetic steel length, the stator tooth magnetic density value is kept in the working magnetic density range of the core material when the stator tooth area is different, and the stator core loss is reduced;

[0022] According to the technical scheme of the application, the stator core slot area and the tooth area are reasonably distributed, the winding wire diameter of the optimized motor scheme is reduced by 12.5% under the same slot fill rate, the winding number is increased by 35%, and the final back electromotive force is increased by about 31.1%; the tooth area S3 is optimized according to the rotor magnetic steel length, the tooth area S3 is increased by 20.79%, and the stator core tooth magnetic density is decreased by about 8.1%; after the stator core slot area and the tooth area are optimized, the total motor loss is reduced by 5.83% compared with before, and the motor efficiency is increased by about 0.38% compared with before. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the application or the technical schemes in the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. The drawings in the following description are only exemplary, and other embodiments can be derived from the provided drawings without paying creative labor for those skilled in the art.

[0024] Figure 1 is a schematic diagram of the internal structure of a permanent magnet synchronous motor (axial section) of an embodiment of the application;

[0025] Figure 2 is Figure 1 is a schematic diagram of the structure of another embodiment of the motor rotor in

[0026] Figure 3 is Figure 1Structure diagram of another embodiment of the motor rotor in the figure, the permanent magnet is a V-shaped structure formed by two segments of different magnetic pole lengths of a one-dimensional permanent magnet;

[0027] Figure 4 The stator core of the embodiment of the application is applied to the corresponding permanent magnet synchronous motor, other conditions being unchanged, with the change of S1 / S2, the change curve of the motor output back electromotive force, it can be obtained from the figure that when S1 / S2 is less than 0.444 and the width of the shoe part is less than 2.6 mm, the effective value of the back electromotive force is obviously reduced when S1 / S2 is greater than 0.537, and is less than 42 V (when the S1 / S2 ratio is greater than 0.537, the peak value is less than 60 V, and the effective value = peak value / 1.414);

[0028] Figure 5 The stator core of the embodiment of the application is applied to the corresponding permanent magnet synchronous motor, other conditions being unchanged, with the change of S2 / S3, the change curve of the motor output back electromotive force, it can be obtained from the figure that when S2 / S3 is less than 0.684, the effective value of the back electromotive force is obviously reduced, and is less than 42 V (when the S2 / S3 ratio is less than 0.684, the peak value is less than 60 V, and the effective value = peak value / 1.414);

[0029] Figure 6 The stator core of the embodiment of the application is applied to the corresponding permanent magnet synchronous motor, other conditions being unchanged, with the change of S2 / S3, the change curve of the motor tooth magnetic density, it can be obtained from the figure that when S2 / S3 is greater than 0.91, the tooth magnetic density value is 1.51, the magnetic density range of the normal working of the stator core is 1.1T-1.5T, and when the magnetic density is greater than 1.5T, the magnetic density is too large, and the motor loss is increased;

[0030] Figure 7 It is a schematic diagram of the flow of magnetic lines in the stator yoke ring and the stator tooth;

[0031] Figure 8 The stator core of the embodiment of the application is applied to the corresponding permanent magnet synchronous motor, other conditions being unchanged, with the change of L / S3, the change curve of the motor tooth magnetic density, the permanent magnet length L is theoretically the larger the better, the larger the L is, the motor excitation ability is improved, and the back electromotive force is also improved to a certain extent, when L / S3 is less than 0.19, the tooth magnetic density is less than 1.1T, which is less than the normal working magnetic density range (1T-1.5T) of the stator core, and the utilization rate of the stator core is reduced; but when L / S3 is greater than 0.22, the tooth magnetic density is greater than 1.5T, the stator core loss is increased, the motor efficiency is reduced, and the motor performance is affected;

[0032] Figure 9 It is a back electromotive force comparison diagram of the synchronous permanent magnet motor adopting the technical solution of the application (the patent curve in the figure) and the technical solution not adopting the application (the curve before optimization in the figure);

[0033] Figure 10 A comparison chart of motor load capacity of a synchronous permanent magnet motor using the technical solution of the present application (the patent curve in the figure) and not using the technical solution of the present application (the curve before optimization in the figure);

[0034] Figure 11 A comparison chart of motor efficiency of a synchronous permanent magnet motor using the technical solution of the present application (the patent curve in the figure) and not using the technical solution of the present application (the curve before optimization in the figure);

[0035] Figure 12 A schematic diagram of the magnetic flux density distribution of a motor stator on a stator core without using the technical solution of the present application;

[0036] Figure 13 A schematic diagram of the magnetic flux density distribution of a motor stator on a stator core using the technical solution of the present application.

[0037] The reference signs are:

[0038] 1, motor stator; 11, stator yoke ring; 121, toothed shoe; 122, connecting column; 13, stator slot; 2, motor rotor; 21, permanent magnet. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0040] In the description of the present application, it should be understood that the orientation words such as “front, back, up, down, left, right”, “transverse, vertical, perpendicular, horizontal” and “top, bottom” and the like indicate the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words “inner, outer” refer to the inner and outer relative to the contour of each component.

[0041] For purposes of the description hereinafter, spatially relative terms, such as "above", "below", "up", "down", "right", "left", "vertical", "horizontal", "top", "bottom", "lateral", "longitudinal", "transverse", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90° or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. It will also be understood that the terms "first", "second", "third", etc. are used herein, merely for purposes of nomenclature, and are not intended to limit the scope of the application, unless otherwise specifically indicated.

[0042] In addition, it should be noted that the use of "first", "second", etc. words to describe various components is only intended to facilitate a clear and consistent description of the components, and does not indicate or imply that the components are limited to the relative positions shown, unless otherwise specifically indicated.

[0043] Referring to Figure 1 and Figure 13 According to an embodiment of the present application, a stator core is provided, which comprises a stator yoke 11, a plurality of stator teeth (not labeled in the figure) are uniformly and circumferentially spaced apart on a radially inner circumferential wall of the stator yoke 11, each of the stator teeth comprises a tooth shoe 121 and a connecting column 122 connected between the tooth shoe 121 and the stator yoke 11, a stator slot 13 is formed between two adjacent stator teeth, the tooth shoes 121 of the two adjacent stator teeth are respectively close to each other, and the two circumferential tooth shoe side walls of the tooth shoes 121 respectively extend towards the extension line of one side of the radially inner circumferential wall (i.e. from the inside to the outside along the radial direction of the stator core), thereby dividing the stator slot 13 into a middle winding slot (not labeled in the figure) and side winding slots (not labeled in the figure) on the circumferential two sides of the middle winding slot, the slot area of the middle winding slot is S1, the slot area of the side winding slot is S2 (i.e. the effective slot area), 0 < S1 / S2 ≤ 0.537, and further, S1 / S2 ≥ 0.444. Specifically, after the stator windings are wound on each of the stator teeth of the stator core, the stator windings will be in the side winding slots, and the stator windings wound on the two adjacent stator teeth are separated by a gap, which is the aforementioned middle winding slot, i.e. the part of the middle winding slot in which there is no stator winding.

[0044] In the technical solution, the S1 / S2 is optimized and limited, so that the effective slot area S2 of the stator core is not reduced due to the too large middle winding slot area S1, the number of turns of the winding is not reduced, and the back electromotive force of the motor is not reduced, that is, the back electromotive force of the motor is not too low and is at a relatively high level, the motor loss is small, and the motor efficiency and performance are relatively high. When S1 / S2 is greater than 0.537, referring to FIG. 6, the back electromotive force of the motor is too small, which will cause the motor current to increase, the copper loss to increase, and the total loss of the motor to increase, and the motor efficiency and performance to decrease. Figure 4

[0045] In a specific embodiment, the back electromotive force effective value range should be kept at 42V-56V. When it is too high, the overall magnetic density of the stator and rotor core increases, and the loss increases. When it is too low, the carrying capacity decreases, and the copper loss increases.

[0046] Specifically, P=U*I, where U is the back electromotive force of the motor, I is the current of the winding, and P is the input power of the motor. When the input power P provided by the power supply to the motor is constant, U decreases and I increases, and the copper loss Pcu=3*I 2 *R, the copper loss increases when the current increases, the total loss of the motor is equal to the iron loss and the copper loss, the loss increases, and the motor efficiency and performance decrease.

[0047] Further, S1 / S2≥0.444. When S1 / S2 is less than 0.444, the width (circumferential width) of the toothed shoe 121 will be too narrow (in a specific embodiment, less than 2.6mm), which is not conducive to winding by the winding machine. It can be understood that the smaller the aforementioned S1 is, the better it is in theory, but the width of the corresponding toothed shoe 121 should not be too narrow under the premise of the aforementioned ratio limit. That is, the middle winding slot area S1 is prevented from being too small, the width of the winding machine is greater than the distance between the shoes, the stator cannot be wound by the winding machine, the winding difficulty of the winding is increased, and the motor trial efficiency is reduced.

[0048] In some embodiments, the radial cross-sectional area of the connecting column 122 is S3, and 0.684≤S2 / S3≤0.91, so that the radial cross-sectional area S3 of the connecting column 122 and the effective slot area are reasonably distributed, the utilization rate of the stator core is improved, the effective slot area is not too large to reduce the connecting column area, the connecting column width or length is not reduced to cause the local magnetic density (that is, the tooth magnetic density) to increase, the motor loss to increase, or the effective slot area to be reduced to cause the motor winding number and the back electromotive force to be reduced too much. Referring to FIG. 7, when S2 / S3 is less than 0.684, the back electromotive force of the motor is too low, and the effective value is less than 42V. Figure 5 Figure 6 ​​As shown, when S2 / S3 exceeds 0.91, the magnetic flux density of the tooth section increases significantly, exceeding 1.5T, which is higher than the common working range magnetic flux density of the stator core (1.1T-1.5T). This will lead to a significant increase in motor losses.

[0049] In some embodiments, the outer diameter of the stator yoke 11 is r, the inner diameter of the stator yoke 11 is r2, the radial inner diameter of the toothed shoe 121 is r1, the radial outer diameter of the toothed shoe 121 is r3, the radial inner and radial outer rings of the stator yoke 11 and the radial inner and radial outer walls of the toothed shoe 121 are concentric, and r1 < r3 < r2 < r; 49mm ≤ r ≤ 52mm, further, 0.56 ≤ r1 / r ≤ 0.58.

[0050] Limiting the inner and outer diameters of the stator keeps the overall size of the motor within a certain range. When the inner and outer diameters of the stator core increase, the size and quantity of the stator and rotor cores and magnets increase for the same stator-rotor air gap. Since rare earth magnets are relatively expensive, the cost of the motor increases to some extent. When the inner and outer diameters of the stator core decrease, the outer diameter of the rotor decreases, the amount of magnets used decreases, the motor's excitation capacity decreases, the input current required to achieve the same output torque increases, the motor loss increases, and the efficiency decreases to some extent.

[0051] In some implementations, 6.5mm ≤ r - r2 ≤ 0.5*(r2 - r3) ≤ 7mm. Since the stator yoke 11 and stator teeth are the main paths of the motor's magnetic flux lines, such as... Figure 7 As shown, with the same stator outer diameter and winding wire diameter, when the yoke radius r2 (that is, the inner diameter of the stator yoke ring 11 mentioned above is r2) increases, the yoke width (that is, the radial width of the stator yoke ring 11) decreases, the core magnetic flux density increases, and the motor iron loss increases. When r2 decreases, the motor slot area decreases. Similarly, with the same yoke radius, when r3 (that is, the radial outer diameter of the aforementioned toothed shoe 121 is r3) increases, the stator core tooth length decreases. Since the tooth length is proportional to the stator core slot area, the yoke and shoe radii satisfy this relationship with the stator outer diameter, ensuring a certain slot area size. This avoids the slot area being too small due to unreasonable yoke and yoke radius sizes, which would lead to a decrease in back electromotive force. At the same time, it does not cause an increase in stator core magnetic flux density or an increase in motor loss.

[0052] According to an embodiment of the present invention, a permanent magnet synchronous motor is also provided, including a motor stator 1. The motor stator 1 includes the stator core described above. In some embodiments, the motor stator 1 further includes a stator winding (not shown in the figure, but indicated by reference) wound on the stator teeth. The wire diameter of the stator winding is φ, 0.68mm≤Φ≤0.73mm. Specifically, the back electromotive force (EMF) corresponding to different numbers of turns and wire diameters of the excitation winding (i.e., the aforementioned stator winding) is different. According to the back EMF calculation formula F=4.44*f*Ψ*N*Kdp wherein f is the motor operating frequency, Ψ is the motor flux linkage value, N is the number of turns of the field winding, K dp is the winding distribution factor; when the motor effective slot area is constant, the larger the wire diameter of the winding, the smaller the number of turns N, and the smaller the back electromotive force, thus preferably the wire diameter Φ of the field winding satisfies the relationship 0.68mm≤Φ≤0.73mm, to avoid the decrease in the number of turns of the winding resulting in a decrease in the back electromotive force of the motor when the wire diameter is large, and the increase in the resistance resulting in an increase in the motor loss when the wire diameter is small, to balance the motor loss and optimize the motor performance.

[0053] In some embodiments, the permanent magnet synchronous motor further comprises a motor rotor 2, a plurality of magnetic poles are formed on the motor rotor 2 along the circumferential direction of the motor rotor 2, and a radially magnetized permanent magnet 21 is arranged below each magnetic pole; the aforementioned permanent magnet 21 is preferably made of rare earth material, so that the volume of the motor rotor can be smaller; the total length of the magnetic poles of the permanent magnet 21 is L, and 0.19≤L / S3≤0.22; since the length of the radial magnetic steel (i.e. the aforementioned radially magnetized permanent magnet 21) increases, the motor excitation capability rises, the air gap magnetic density and the tooth magnetic density rise, and thus it is necessary to reduce the tooth magnetic density by increasing the tooth area S3, so that S3 and the total length of the magnetic poles L of the rotor satisfy the relationship 0.19≤L / S3≤0.22, and the tooth area S3 is adjusted according to the length of the magnetic steel of the rotor, so that the magnetic density of the stator tooth is kept within the working magnetic density range of the core material at different magnetic steel lengths, thereby reducing the loss of the stator core. Figure 8 It can be concluded that when L / S3<0.19, the tooth magnetic density is too small, less than 1.1T, and when L / S3>0.22, the tooth magnetic density is too large.

[0054] The aforementioned total length L of the magnetic poles is specifically shown in Figure 2 and Figure 3 When there is only one radially magnetized permanent magnet 21 below each magnetic pole, as shown in Figure 2 , it is arranged in a straight line, and at this time L is the length of the magnetic poles of the permanent magnet 21; and when there are a plurality of radially magnetized permanent magnets 21 below each magnetic pole, as shown in Figure 3 , it is arranged in a V shape, wherein the length of the magnetic poles of one permanent magnet 21 is L1, and the length of the magnetic poles of another permanent magnet 21 is L2, and at this time L=L1+L2.

[0055] According to the technical scheme of the present application, the stator core slot area and the tooth area are reasonably distributed, and under the same slot fill rate, the wire diameter of the optimized motor scheme is reduced by 12.5%, the number of turns is increased by 35%, as shown in Figure 9 , and the final back electromotive force is increased by about 31.1%; in combination with Figure 12 and Figure 13As shown, after optimizing the tooth area S3 according to the length of the rotor magnetic steel, the tooth area S3 is increased by 20.79%, and the stator core tooth magnetic density is decreased by about 8.1%; see Figure 9 and Figure 10 As shown, after optimizing the stator core slot area and tooth area, the total loss of the motor is reduced by 5.83% compared with the previous one, and correspondingly, the motor efficiency is increased by about 0.38% compared with the previous one.

[0056] According to the embodiments of the present application, a compressor is also provided, which comprises the above permanent magnet synchronous motor.

[0057] According to the embodiments of the present application, an air conditioner is also provided, which comprises the above compressor.

[0058] Those skilled in the art can easily understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0059] The above description is only the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above description is only the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, which should be considered as the protection scope of the present application.

Claims

1. A stator core comprising a stator yoke (11), a plurality of stator teeth are uniformly spaced along the circumferential direction of a radially inner circumferential wall of the stator yoke (11), each of the stator teeth comprises a tooth shoe (121) and a connecting column (122) connected between the tooth shoe (121) and the stator yoke (11), a stator slot (13) is formed between two adjacent stator teeth, characterized in that, Two adjacent stator teeth have two circumferential tooth shoe side walls of two tooth shoes (121) close to each other, respectively, extending towards the extension line of one side of the radial inner circumferential wall, so as to divide the stator slot (13) into a middle intermediate winding slot and a side winding slot on the circumferential two sides of the middle intermediate winding slot, the slot area of the middle intermediate winding slot is S1, the slot area of the side winding slot is S2, 0 2. The stator core according to claim 1, characterized by S1 / S2≥0.444; and / or, the radial cross-sectional area of the connecting column (122) is S3, 0.684≤S2 / S3≤0.

91.

3. The stator core of claim 2, characterized by The outer diameter of the stator yoke ring (11) is r, the inner diameter of the stator yoke ring (11) is r2, the radial inner diameter of the tooth shoe (121) is r1, the radial outer diameter of the tooth shoe (121) is r3, the radial inner ring and the radial outer ring of the stator yoke ring (11) are concentric, the radial inner wall and the radial outer wall of the tooth shoe (121) are concentric, and r1 4. The stator core of claim 3, characterized by 0.56≤r1 / r≤0.58; and / or, 6.5mm≤r-r2≤0.5*(r2-r3)≤7mm.

5. A permanent magnet synchronous motor, characterized by, The motor stator (1) comprises the stator core according to any one of claims 2 to 4.

6. The permanent magnet synchronous motor of claim 5, wherein, The motor stator (1) further comprises a stator winding wound on the stator teeth, and a wire diameter of the stator winding is Φ, 0.68mm≤Φ≤0.73mm.

7. The permanent magnet synchronous motor of claim 5, wherein, Further comprising a motor rotor (2), a plurality of magnetic poles are formed on the motor rotor (2) along the circumferential direction, and a radially magnetized permanent magnet (21) is arranged under each magnetic pole, and a total length of the magnetic poles of the permanent magnet (21) is L, 0.19≤L / S3≤0.

22.

8. The permanent magnet synchronous motor of claim 7, wherein, The material of the permanent magnet (21) is rare earth.

9. A compressor characterized by, The permanent magnet synchronous motor comprises the motor stator (1) according to any one of claims 5 to 8.

10. An air conditioner characterized by comprising: The compressor comprises the motor stator (1) according to claim 9.

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