Processing method and processing device for motor stator, and motor

Abstract

The invention relates to the technical field of compressors, and discloses a machining method for a motor stator, and the method comprises the steps: building a coordinate system with a stator center point as an original point, and determining the radius of a second auxiliary circle according to the inner diameter of the stator when a tooth boot is of a symmetric arc structure; the center of the second auxiliary circle is a stator center point; determining the center of the first auxiliary circle according to the parameters of the motor and the second auxiliary circle; determining the radius of the first auxiliary circle according to the length range of each point on the arc section of the tooth boot and the center of the first auxiliary circle when the tooth boot is of the symmetrical arc structure; and determining a starting point of the arc structure which is not symmetrical about the stator center line on the arc section of the tooth boot when the tooth boot is of the symmetrical arc structure, and taking the arc section of the first auxiliary circle from the starting point to the intersection point of the first auxiliary circle and the stator tooth as the arc section of the tooth boot which is not symmetrical about the stator center line. The method can improve the machining precision of the tooth shoe structure, so that the noise of motor operation is reduced. The invention further discloses a machining device for the motor stator punching sheet and a motor.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, for example, to a processing method, device and motor for a motor stator. Background Art

[0002] Nowadays, people's requirements for the operating noise of smart home appliances are gradually increasing, especially the operating noise of air conditioners. Compressor noise is the main part of air conditioner operating noise, among which the compressor motor is the main source of compressor noise. Motor noise is mainly divided into three categories: electromagnetic noise, mechanical noise, and aerodynamic noise; among them, electromagnetic noise has the greatest impact on motor noise. Excessive electromagnetic noise will inevitably bring users a poor experience when using smart home appliances.

[0003] A motor is disclosed in the related art, comprising: a rotor, wherein a circle passing through the outermost contour of a radial cross-section of the rotor is set as a contour circle, and the center of the contour circle passes through the axis of the rotor; a stator, which is arranged concentrically with the rotor, wherein the stator comprises a stator yoke and stator teeth, wherein the stator comprises a plurality of stator teeth, and the plurality of stator teeth are arranged on the stator yoke at intervals along the circumference of the stator yoke, wherein the stator teeth comprise a first tooth shoe and a second tooth shoe, wherein the rotor passes through the first tooth shoe and the second tooth shoe in sequence along the rotation direction of the rotor, wherein the minimum spacing between the first tooth shoe and the contour circle is L1, and the minimum spacing between the second tooth shoe and the contour circle is L2, and L1 is greater than L2; along the radial direction of the stator, the minimum thickness of the first tooth shoe is L3, and the minimum thickness of the second tooth shoe is L4, and the minimum spacing between the cross-section of the stator tooth along the radial direction of the stator and the contour circle is L5, satisfying (L4-L3) / L5 is less than 3.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] The toothed boots in the related art have a variety of deformation structures, but in the application process, the toothed boots have high structural accuracy requirements. Improper toothed boots structure will lead to worse electromagnetic noise of the motor.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present disclosure provide a method, a device and a motor for machining a motor stator, so as to improve the machining accuracy of a tooth shoe structure and thus reduce the noise of the motor operation.

[0009] In some embodiments, the method comprises:

[0010] A coordinate system is established with the center point of the stator as the origin, and the radius of the second auxiliary circle is determined according to the inner diameter of the stator when the tooth shoe is a symmetrical arc structure; the center of the second auxiliary circle is the center of the stator;

[0011] Determine the center of the first auxiliary circle according to the parameters of the motor and the second auxiliary circle;

[0012] Determine the radius of the first auxiliary circle according to the length range between a point on the arc segment of the tooth shoe and the center of the first auxiliary circle when the tooth shoe is a symmetrical arc structure;

[0013] When the tooth shoe is a symmetrical arc structure, a starting point of the arc segment structure that is not symmetrical about the stator center line is determined on the tooth shoe arc segment, and the arc segment of the first auxiliary circle from the starting point to the intersection with the stator tooth is used as the arc segment of the tooth shoe that is not symmetrical about the stator center line.

[0014] In some embodiments, the method comprises:

[0015] A coordinate system is established with the center point of the stator as the origin, and the radius of the second auxiliary circle is determined according to the inner diameter of the stator when the tooth shoe is a symmetrical arc structure; the center of the second auxiliary circle is the center of the stator;

[0016] Determine the center of the first auxiliary circle according to the parameters of the motor and the second auxiliary circle;

[0017] Determine the radius of the first auxiliary circle according to the length range between a point on the arc segment of the tooth shoe and the center of the first auxiliary circle when the tooth shoe is a symmetrical arc structure;

[0018] When the stator tooth shoe is a symmetrical arc structure, a starting point of a straight line segment structure that is not symmetrical about the stator center line is determined on the tooth shoe arc segment, and the straight line segment of the first auxiliary circle from the starting point to the intersection with the stator tooth is used as the straight line segment of the tooth shoe that is not symmetrical about the stator center line.

[0019] In some embodiments, the device includes: a processor and a memory storing program instructions, and the processor is configured to execute the aforementioned machining method for the motor stator when running the program instructions.

[0020] In some embodiments, the motor includes: a rotor; a stator, including a stator yoke, stator teeth and tooth shoes; the stator teeth connect the stator yoke and the tooth shoes, and the tooth shoes include an arc segment structure or a straight line segment structure that is not symmetrical about the stator center line.

[0021] The processing method, device and motor for a motor stator provided by the embodiments of the present disclosure can achieve the following technical effects:

[0022] In the disclosed embodiment, a second auxiliary circle is determined based on a tooth shoe with a symmetrical arc structure. Then, based on the second auxiliary circle, motor parameters, and the tooth shoe being an arc with a symmetrical arc structure, a first auxiliary circle is determined. Finally, an arc segment where the first auxiliary circle intersects with the stator teeth is used as an arc segment of the tooth shoe that is not symmetrical about the stator center line. In this way, the asymmetric arc segment of the tooth shoe is determined more accurately through a feasible method. This helps to improve the machining accuracy of the tooth shoe structure, thereby reducing the noise of the motor operation.

[0023] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0025] Figure 1 It is a schematic diagram of the stator structure in the prior art;

[0026] Figure 2 is a structural schematic diagram of a motor provided by an embodiment of the present disclosure;

[0027] Figure 3 is a schematic diagram of a method for processing a motor stator punching sheet provided by an embodiment of the present disclosure;

[0028] Figure 4 is a schematic diagram of a stator structure of a motor provided by an embodiment of the present disclosure when the rotor rotates counterclockwise;

[0029] Figure 5 is a schematic diagram of a stator structure of a motor provided by an embodiment of the present disclosure when the rotor rotates clockwise;

[0030] Figure 6 It is a schematic diagram of a method for determining the starting point of an asymmetric arc segment in a method for processing a motor stator punching sheet provided by an embodiment of the present disclosure;

[0031] Figure 7 is a schematic diagram of a motor output torque simulation provided by an embodiment of the present disclosure;

[0032] Figure 8 is a schematic diagram of another method for processing motor stator punching sheets provided by an embodiment of the present disclosure;

[0033] Fig. 9It is a structural schematic diagram of triangle cutting in a processing method for motor stator punching sheets provided by an embodiment of the present disclosure;

[0034] Fig.10 It is a partially enlarged structural schematic diagram of a triangular cutting in a processing method for a motor stator punching sheet provided by an embodiment of the present disclosure;

[0035] Fig.11 is another motor output torque simulation schematic diagram provided by an embodiment of the present disclosure;

[0036] Fig.12 is a schematic diagram of another method for processing motor stator punching sheets provided by an embodiment of the present disclosure;

[0037] Fig.13 It is a schematic diagram of a processing device for motor stator punching provided in an embodiment of the present disclosure.

[0038] Reference numerals:

[0039] 1: Yoke; 2: Stator teeth; 3: Tooth shoes; 4: First auxiliary circle; 5: Second auxiliary circle. DETAILED DESCRIPTION

[0040] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0041] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0042] Unless otherwise stated, the term "plurality" means two or more.

[0043] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0044] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0045] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0046] Combination Figure 1 As shown, the stator tooth boots in the prior art are symmetrical arc segment structures. When the motor rotor rotates, the force on the stator tooth boots is affected by the direction of rotation, and the force usually increases gradually with the direction of motor rotation. As a result, the force on the stator teeth is uneven, with one side of the stator tooth boots being subjected to greater force and the other side of the stator tooth boots being subjected to less force. The unbalanced force on the tooth boots causes large fluctuations in the motor output torque and generates greater electromagnetic noise. This further causes greater mechanical vibrations, which are transmitted to the compressor structure and cause greater compressor vibrations and noise. Assuming that the rotor rotates counterclockwise, then Figure 1 The force at the stator tooth shoe point P1 is shown to be greater than the force at P3, and the force on the entire tooth shoe is inconsistent.

[0047] In order to solve the problem of tooth shoe stress, combined with Figure 2 The motor of the embodiment of the present disclosure includes a stator and a rotor. The stator includes a stator yoke 1, stator teeth 2 and tooth shoes 3; the stator teeth 2 connect the stator yoke 1 and the tooth shoes 3, and the tooth shoes 3 include an arc structure or a straight line structure that is not symmetrical about the stator center line. Not symmetrical about the stator center line means that the center O' of the circle where the arc structure is located does not coincide with the stator center point O (such as Figure 4 , 5 As shown). The thickness of the tooth shoe gradually increases with the direction of rotation, so that an uneven air gap is formed between the stator and the rotor. Optionally, the tooth shoe can also include an arc segment structure that is symmetrical about the center line of the stator. In this case, the tooth shoe includes a symmetrical arc structure and an arc structure or a straight line structure that is not symmetrical about the center line of the stator.

[0048] Figure 2 In the figure, the motor rotor rotates counterclockwise, and it can be clearly seen that the air gap gradually decreases with the direction of rotation. Asymmetric tooth boots can effectively reduce the output torque fluctuation of the permanent magnet motor, thereby achieving the purpose of reducing the vibration and noise of the motor during operation. However, if the asymmetric structure is not processed properly, the motor torque fluctuation will not only not be significantly reduced; even in some specific asymmetric structures, the motor torque fluctuation will increase, causing the motor vibration and noise to worsen.

[0049] In order to effectively improve the machining accuracy of the asymmetric structure of the tooth shoe, combined with Figure 3 As shown, the embodiment of the present disclosure provides a method for machining a motor stator, comprising:

[0050] S101, the processor establishes a coordinate system with the center point of the stator as the origin, and determines the radius of the second auxiliary circle according to the inner diameter of the stator when the tooth shoe is a symmetrical arc structure; the center of the second auxiliary circle is the center of the stator.

[0051] S102: The processor determines the center of the first auxiliary circle according to the parameters of the motor and the second auxiliary circle.

[0052] S103, the processor determines the radius of the first auxiliary circle according to the length range between a point on the arc segment of the tooth shoe and the center of the first auxiliary circle when the tooth shoe is a symmetrical arc structure.

[0053] S104, the processor determines the starting point of the arc segment structure that is not symmetrical about the stator center line on the arc segment of the tooth shoe when the tooth shoe is a symmetrical arc structure, and uses the arc segment of the first auxiliary circle from the starting point to the intersection with the stator tooth as the arc segment of the tooth shoe that is not symmetrical about the stator center line.

[0054] As shown above, when the tooth shoe is a symmetrical arc structure, the center of the circle where the tooth shoe arc segment is located coincides with the center point of the stator. When the tooth shoe is an asymmetrical arc structure, the center of the circle where the tooth shoe arc segment is located does not coincide with the center point of the stator. In other words, the arc segment of the tooth shoe that is not symmetrical about the stator center line is an arc segment of a certain circle. Therefore, the key to improving the machining accuracy of the tooth shoe arc segment lies in determining the circle where the asymmetrical arc segment is located (i.e., the first auxiliary circle), that is, determining the center and radius.

[0055] Specifically, a coordinate system is established with the center point of the stator as the origin of the coordinate axis, and the parameters of the second auxiliary circle are determined (the parameters include the center O and the radius R2). The center line of any stator tooth of the stator is used as the Y axis, and the tooth shoe corresponding to the stator tooth is the target tooth shoe for which the asymmetric arc segment needs to be determined. The parameters of the second auxiliary circle are determined based on the symmetrical arc structure, with the center point of the stator as the center of the circle, and the radius depends on the stator inner diameter of the symmetrical tooth shoe (the stator inner diameter refers to the radius of the inner circle of the stator). The center of the asymmetric arc structure is within the stator inner diameter circle and has a certain distance from the center point of the stator. Therefore, there must be a center of the circle where the asymmetric structure is located on the ring at a certain distance from the center point of the stator, that is, the center of the first auxiliary circle. Therefore, a second auxiliary circle is set to assist in determining the center of the first auxiliary circle. In addition, the parameters of the motor, such as the direction of rotation, the number of rotor poles, etc., will affect the center position of the first auxiliary circle. Therefore, based on the second auxiliary circle and the motor parameters, the center of the first auxiliary circle is comprehensively determined.

[0056] The arc segment of the first auxiliary circle constitutes the asymmetric arc structure of the tooth shoe, so the radius R1 of the first auxiliary circle must exist within the length range of the arc segment when the center O' of the first auxiliary circle and the tooth shoe are symmetrical arc structures. Here, the center O' of the first auxiliary circle does not coincide with the stator center point O, so the lengths from the center O' point to each point of the tooth shoe arc segment of the symmetrical structure are different, forming an interval range value. The radius of the first auxiliary circle falls within the interval range value.

[0057] After determining the parameters of the first auxiliary circle, it is necessary to determine the position of the asymmetric arc on the tooth shoe, that is, the starting point position. It should be noted that the tooth shoe includes an arc structure that is not symmetrical about the stator center line. The tooth shoe may include only the asymmetric arc segment, or the tooth shoe may include a first arc segment and a second arc segment. The first arc segment is a symmetrical arc segment, and the second arc segment is an asymmetric arc segment. Therefore, on the arc segment of the tooth shoe when the tooth shoe is a symmetrical arc structure, the starting point of the arc segment structure that is not symmetrical about the stator center line is determined. If the starting point is at the end of the symmetrical arc structure, the tooth shoe only includes an asymmetric arc segment. Otherwise, the tooth shoe includes two arc segments. The end point of the asymmetric arc structure is the intersection of the first auxiliary circle and the stator tooth. Before the tooth shoe is determined, the first auxiliary circle and the stator tooth have an intersection, and then the tooth shoe is formed based on the starting point, the end point and the arc of the first auxiliary circle.

[0058] It should be noted that the above steps only determine one of the multiple tooth shoes of the stator, and the tooth shoe structure corresponding to the other stator teeth of the stator can be determined by repeating the above steps.

[0059] Using the processing method for the motor stator provided in the embodiment of the present disclosure, the second auxiliary circle is determined based on the tooth shoe with a symmetrical arc structure. Then, based on the second auxiliary circle, the motor parameters and the arc of the tooth shoe with a symmetrical arc structure, the first auxiliary circle is determined. Finally, a section of the arc segment where the first auxiliary circle intersects with the stator tooth is used as the arc segment of the tooth shoe that is not symmetrical about the stator center line. In this way, the asymmetric arc segment of the tooth shoe is determined more accurately through a feasible method. This helps to improve the processing accuracy of the tooth shoe structure, thereby reducing the noise of the motor operation.

[0060] Optionally, in step S101, the processor determines the radius of the second auxiliary circle according to the inner diameter of the stator when the tooth shoe is a symmetrical arc structure, including:

[0061] a×R in ≤R2≤b×R in .

[0062] Among them, R in is the inner diameter of the stator when the tooth shoe is in a symmetrical structure, R2 is the radius of the second auxiliary circle, and a and b are both constants less than 1.

[0063] R inis the radius of the stator inner circle (see Figure 1 ). Preferably, the value range of a and b is (0.25, 0.75). The radius R2 of the second auxiliary circle satisfies 0.25×R in ≤R2≤0.75×R in When the gear shoe structure is determined, the motor torque pulsation corresponding to the determined gear shoe structure is smaller.

[0064] Optionally, in step S102, the processor determines the center of the first auxiliary circle according to the parameters of the motor and the second auxiliary circle, including:

[0065] S121, the processor obtains an angle difference between a first spatial angle occupied by each stator tooth of the motor and a second spatial angle occupied by each rotor pole.

[0066] S122, the processor determines a preliminary position range of the center of the first auxiliary circle according to the rotation direction of the motor rotor.

[0067] S123, within the preliminary position range, the processor uses a point located on the arc of the second auxiliary circle and at which the angle between the line connecting the center of the second auxiliary circle and the Y axis of the coordinate system is less than or equal to the angle difference as the center of the first auxiliary circle.

[0068] Here, when the stator and rotor of the motor are given, the spatial angles occupied by each stator tooth and each pole of the rotor can be calculated; and then the angle difference between the two can be obtained. Usually, the number of poles of the motor rotor is less than the number of stator slots, so the angle difference refers to the difference between the second spatial angle and the first spatial angle. This angle difference is used to determine the center of the first auxiliary circle.

[0069] The thickness of the tooth shoe gradually increases with the direction of rotation, so the direction of change of the thickness of the tooth shoe is different with the direction of rotation of the motor rotor. Figure 4 , 5 For the tooth shoe at the top of the stator, the centers of the circles where the asymmetric arc segments of the corresponding tooth shoes of the rotors with different rotation directions are located are in different coordinate system quadrants. After determining the initial position range of the center of the first auxiliary circle, find a point on the second auxiliary circle so that the angle between the point and the line connecting the center of the second auxiliary circle and the Y axis of the coordinate system is less than or equal to the above angle difference. This point is the center of the first auxiliary circle.

[0070] Optionally, in step S121, the processor obtains an angle difference between a first spatial angle occupied by each stator tooth of the motor and a second spatial angle occupied by each pole of the rotor, including:

[0071] The processor determines the number of stator slots S and the number of rotor poles P of the motor.

[0072] The processor calculates the angle difference

[0073] In the compressor, the motor usually adopts 6-slot 4-pole, 9-slot 6-pole, 12-slot 8-pole and other slot-pole combinations, and the corresponding angle differences θ are 30°, 20°, and 15° respectively; the stators in the attached drawings are all 12-slot structures.

[0074] Optionally, in step S122, the processor determines a preliminary position range of the center of the first auxiliary circle according to the rotation direction of the motor rotor, including:

[0075] When the motor rotor rotates clockwise, the processor determines that the preliminary position range of the center of the first auxiliary circle is the third quadrant of the coordinate axis.

[0076] When the motor rotor rotates counterclockwise, the processor determines that the preliminary position range of the center of the first auxiliary circle is the fourth quadrant of the coordinate axis.

[0077] Combination Figure 4 and Figure 5 , when the motor rotor rotates clockwise, the thickness of the tooth shoe gradually increases with the direction of rotation, and the uneven air gap formed between the stator and the rotor gradually decreases with the direction of rotation. Therefore, the center of the first auxiliary circle is located in the third quadrant. In other words, when the motor rotates clockwise, the center of the first auxiliary circle is located in the arc formed by the third quadrant, so that the motor air gap can gradually decrease with the direction of rotation. According to the principle of symmetry, it can be seen that when the motor rotor rotates counterclockwise, the center of the first auxiliary circle is located in the fourth quadrant.

[0078] Optionally, the angle in step S123 is greater than or equal to and is less than or equal to the angle difference.

[0079] Here, the center of the first auxiliary circle is assumed to be in the X-axis direction, and the distance from the stator center point O is D x In the Y-axis direction, the distance from the stator center point O is D y Then the angle between the line connecting the center of the first auxiliary circle and the center of the second auxiliary circle and the Y axis (acute angle) is The value range of this angle is In this way, the asymmetric arc segment of the tooth shoe determined within the angle range can reduce the torque pulsation of the motor more and make the torque pulsation smaller.

[0080] Optionally, S103, the processor determines the radius of the first auxiliary circle according to the length range between a point on the arc segment of the tooth shoe and the center of the first auxiliary circle when the tooth shoe is a symmetrical arc structure, including:

[0081] When the motor rotor rotates counterclockwise, the length range from the first vertex and midpoint of the tooth shoe arc segment to the center of the first auxiliary circle when the tooth shoe is a symmetrical arc structure is used as the radius value range of the first auxiliary circle.

[0082] When the motor rotor rotates clockwise, the length range from the second vertex and midpoint of the tooth shoe arc segment to the center of the first auxiliary circle when the tooth shoe is a symmetrical arc structure is used as the radius value range of the first auxiliary circle.

[0083] The midpoint refers to the intersection of the arc segment of the tooth shoe and the center line of the stator, the first vertex is the vertex on the left side of the tooth shoe, and the second vertex is the vertex on the right side of the tooth shoe.

[0084] Here, Figure 6 The rotor rotates counterclockwise as an example. The first vertex is P1, the midpoint is P2, and the second vertex is P3. When the rotor rotates counterclockwise, the center O' of the first auxiliary circle is located in the fourth quadrant. The radius R1 of the first auxiliary circle satisfies P is any point on the arc segment from the first vertex to the midpoint, that is, the starting point of the asymmetric arc segment. If the length range from the midpoint and the second vertex to the center of the first auxiliary circle is used as the radius value range of the first auxiliary circle, then unequal air gaps cannot be formed between the asymmetric arc of the tooth shoe and the rotor. It is also impossible to achieve the purpose of reducing the vibration and noise during the operation of the motor. In other words, when the rotor rotates counterclockwise, the value in the length range from the first vertex and the midpoint to the center of the first auxiliary circle is generally greater than the value in the length range from the midpoint and the second vertex to the center of the first auxiliary circle. The radius of the first auxiliary circle takes a larger value to ensure that there is a common area between the first auxiliary circle and the stator teeth, so as to determine that unequal air gaps are formed between the tooth shoe and the rotor.

[0085] Furthermore, combined with Figure 6 , based on the parameters of the stator and the auxiliary circle, it can be determined and The specific length of the stator. Where Bs0 is the stator slot width (see Figure 1 ).

[0086]

[0087] The above principle and calculation method are also applicable to the case where the motor rotor rotates clockwise, and will not be described in detail here.

[0088] Optionally, S104, the processor determines, on the arc segment of the tooth shoe when the tooth shoe is a symmetrical arc structure, a starting point of an arc segment structure that is not symmetrical about the stator center line, including:

[0089] When the motor rotor rotates counterclockwise, any point on the arc segment from the first vertex to the midpoint of the tooth shoe arc segment when the tooth shoe is a symmetrical arc structure is used as the starting point of the arc segment structure that is not symmetrical about the stator center line.

[0090] When the motor rotor rotates clockwise, any point on the arc segment from the second vertex to the midpoint of the tooth shoe arc segment when the tooth shoe is a symmetrical arc structure is used as the starting point of the arc segment structure that is not symmetrical about the stator center line.

[0091] Here, the definitions of the first vertex, the second vertex, and the midpoint are as described above. In order for the motor to obtain better electromagnetic performance, the output torque pulsation is small. The larger the proportion of the asymmetric arc segment of the tooth boot, the better. Therefore, the starting point of the asymmetric arc segment is determined on the arc segment from the first vertex / second vertex to the midpoint. In this way, the length of the asymmetric arc segment of the tooth boot is greater than the length of the symmetric arc segment. Preferably, when the motor rotor rotates counterclockwise, the first vertex P1 is used as the starting point. Similarly, when the motor rotor rotates clockwise, the second vertex P2 is used as the starting point. In this way, the tooth boot only includes asymmetric arc segments.

[0092] The toothed shoe structure determined by the above embodiment enables the motor to have better electromagnetic performance and smaller output torque pulsation. Figure 7 As shown. From the simulation comparison diagram, it can be clearly found that under the same current, the average value of the motor output torque of this scheme is almost the same as that of the existing scheme, but the peak-to-peak value of the motor output torque is reduced from 0.7259Nm to 0.3752Nm, and the output torque pulsation is reduced from 20.33% to 10.60%. In the figure, the solid line is the motor output torque of this scheme, and the dotted line is the motor output torque of the existing scheme.

[0093] Combination Figure 8 As shown, the embodiment of the present disclosure provides another method for machining a motor stator, comprising:

[0094] S101, the processor establishes a coordinate system with the center point of the stator as the origin, and determines the radius of the second auxiliary circle according to the inner diameter of the stator when the tooth shoe is a symmetrical arc structure; the center of the second auxiliary circle is the center of the stator.

[0095] S102: The processor determines the center of the first auxiliary circle according to the parameters of the motor and the second auxiliary circle.

[0096] S103, the processor determines the radius of the first auxiliary circle according to the length range between a point on the arc segment of the tooth shoe and the center of the first auxiliary circle when the tooth shoe is a symmetrical arc structure.

[0097] S104, the processor determines the starting point of the arc structure that is not symmetrical about the stator center line on the arc segment of the tooth shoe when the tooth shoe is a symmetrical arc structure, and uses the arc segment of the first auxiliary circle from the starting point to the intersection with the stator tooth as the arc segment of the tooth shoe that is not symmetrical about the stator center line.

[0098] S205, the processor cuts the tooth shoe using the triangular edge so that the tooth shoe has a straight line segment after cutting.

[0099] The length of the straight line segment is L AB Satisfies c×δ≤L AB ≤d×δ, δ is the air gap between the motor stator and rotor; the angle β between the line OA connecting the starting point A of the straight line segment and the center point O of the stator and the center line of the stator satisfies 0<β≤5°, and the value range of OA is R in ≤L OA ≤R in +δ.

[0100] In the embodiment of the present disclosure, in order to better and effectively reduce the motor output torque pulsation, the tooth boots determined by the above method are cut with triangles. Fig. 9 (The motor rotor rotates counterclockwise), Fig.10 The triangle is formed by specifying the center point O of the stator as one end point and selecting two end points A and B on the stator teeth. The value range of c and d is [8, 11], and the value range of the air gap δ in the conventional permanent magnet motor is [0.40mm, 0.75mm].

[0101] The disclosed embodiment further reduces the torque pulsation and can reduce the motor output torque pulsation to a greater extent. Taking a 12-slot 8-pole motor as an example, when L OA =R in +δ,β=1°,L AB =11×δ, the motor output torque is as follows Fig.11 As shown. Figure 8 In comparison, the motor output torque pulsation is reduced to a greater extent, which can further reduce the motor noise and compressor noise vibration.

[0102] Optionally, the straight line segment in step S205 is a horizontal straight line segment or an inclined straight line segment, that is, the AB line segment can be a horizontal straight line segment or an inclined straight line segment.

[0103] Combination Fig.12 As shown, the embodiment of the present disclosure provides another method for machining a motor stator, comprising:

[0104] S101, the processor establishes a coordinate system with the center point of the stator as the origin, and determines the radius of the second auxiliary circle according to the inner diameter of the stator when the tooth shoe is a symmetrical arc structure; the center of the second auxiliary circle is the center of the stator.

[0105] S102: The processor determines the center of the first auxiliary circle according to the parameters of the motor and the second auxiliary circle.

[0106] S103, the processor determines the radius of the first auxiliary circle according to the length range between a point on the arc segment of the tooth shoe and the center of the first auxiliary circle when the tooth shoe is a symmetrical arc structure.

[0107] S304, the processor determines the starting point of the straight line segment structure that is not symmetrical about the stator center line on the arc segment of the tooth shoe when the tooth shoe is a symmetrical arc structure, and uses the straight line segment of the first auxiliary circle from the starting point to the intersection with the stator tooth as the straight line segment of the tooth shoe that is not symmetrical about the stator center line.

[0108] In the disclosed embodiment, the asymmetric structure of the tooth boot is a straight line structure. The tooth boot may include only a straight line segment, or include a symmetrical arc segment and a straight line segment. The method described above is also applicable to the tooth boot of the straight line segment, and the tooth boot of the straight line segment can also be cut into a triangle, which will not be described here.

[0109] Combination Fig.13 As shown, an embodiment of the present disclosure provides a processing device 200 for a motor stator, including a processor 100 and a memory 101. Optionally, the device may also include a communication interface 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other through the bus 103. The communication interface 102 may be used for information transmission. The processor 100 may call the logic instructions in the memory 101 to execute the processing method for the motor stator of the above embodiment.

[0110] In addition, the logic instructions in the memory 101 described above may be implemented in the form of software functional units and when sold or used as independent products, may be stored in a computer-readable storage medium.

[0111] The memory 101 is a computer-readable storage medium that can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 100 executes functional applications and data processing by running the program instructions / modules stored in the memory 101, that is, implements the processing method for the motor stator in the above embodiment.

[0112] The memory 101 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 101 may include a high-speed random access memory and may also include a non-volatile memory.

[0113] like Figure 2As shown, an embodiment of the present disclosure provides a motor, including a rotor and a stator. The stator includes a stator yoke, stator teeth and tooth shoes; the stator teeth connect the stator yoke and the tooth shoes, the tooth shoes include a circular arc segment structure or a straight line segment structure that is not symmetrical about the stator center line, and the tooth shoes are obtained by processing the processing device 200 for the motor stator.

[0114] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned method for machining a motor stator.

[0115] The computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0116] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0117] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0118] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0119] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0120] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A method for machining a motor stator, characterized in that: The motor stator comprises a stator yoke, stator teeth and tooth shoes; the stator teeth connect the stator yoke and the tooth shoes, and the tooth shoes comprise an arc structure that is not symmetrical about the stator center line; the method comprises: A coordinate system is established with the center point of the stator as the origin, and the radius of the second auxiliary circle is determined according to the inner diameter of the stator when the tooth shoe is a symmetrical arc structure; the center of the second auxiliary circle is the center point of the stator; Determine the center of the first auxiliary circle according to the parameters of the motor and the second auxiliary circle; Determine the radius of the first auxiliary circle according to the length range between each point on the arc segment of the tooth shoe and the center of the first auxiliary circle when the tooth shoe is a symmetrical arc structure; When the tooth shoe is a symmetrical arc structure, a starting point of the arc structure that is not symmetrical about the stator center line is determined on the tooth shoe arc segment, and the arc segment of the first auxiliary circle from the starting point to the intersection with the stator tooth is used as the arc segment of the tooth shoe that is not symmetrical about the stator center line.

2. The method according to claim 1, characterized in that Determining the radius of the second auxiliary circle according to the inner diameter of the stator when the tooth shoe is a symmetrical arc structure includes: a×R in ≤R2≤b×R in ; Among them, R in is the inner diameter of the stator when the stator tooth shoe is in a symmetrical structure, R2 is the radius of the second auxiliary circle, and a and b are both constants less than 1.

3. The method according to claim 1, characterized in that Determining the center of the first auxiliary circle according to the parameters of the motor and the second auxiliary circle includes: Obtaining an angle difference between a first spatial angle occupied by each stator tooth of the motor and a second spatial angle occupied by each pole of the rotor; According to the rotation direction of the motor rotor, determine the initial position range of the center of the first auxiliary circle; Within the preliminary position range, a point located on the arc of the second auxiliary circle and at which the angle between the line connecting the center of the second auxiliary circle and the Y axis of the coordinate system is less than or equal to the angle difference is used as the center of the first auxiliary circle.

4. The method according to claim 3, characterized in that Determining the preliminary position range of the center of the first auxiliary circle according to the rotation direction of the motor rotor includes: When the motor rotor rotates clockwise, the initial position range of the center of the first auxiliary circle is determined to be the third quadrant of the coordinate axis; or, When the motor rotor rotates counterclockwise, the initial position range of the center of the first auxiliary circle is determined to be the fourth quadrant of the coordinate axis.

5. The method according to claim 1, characterized in that The step of determining the radius of the first auxiliary circle according to the length range between a point on the arc segment of the stator tooth shoe and the center of the first auxiliary circle when the stator tooth shoe is a symmetrical arc structure comprises: When the motor rotor rotates counterclockwise, the length range from the first vertex and midpoint of the tooth shoe arc segment to the center of the first auxiliary circle when the tooth shoe is a symmetrical arc structure is used as the radius value range of the first auxiliary circle; or, When the motor rotor rotates clockwise, the length range from the second vertex and midpoint of the tooth shoe arc segment to the center of the first auxiliary circle when the tooth shoe is a symmetrical arc structure is used as the radius value range of the first auxiliary circle; The midpoint refers to the intersection of the arc segment of the tooth shoe and the center line of the stator, the first vertex is the vertex on the left side of the tooth shoe, and the second vertex is the vertex on the right side of the tooth shoe.

6. The method according to claim 1, characterized in that When the tooth shoe is a symmetrical arc structure, the starting point of the arc segment structure that is not symmetrical about the stator center line is determined on the tooth shoe arc segment, including: When the motor rotor rotates counterclockwise, any point on the arc segment from the first vertex to the midpoint of the tooth shoe arc segment when the tooth shoe is a symmetrical arc structure is used as the starting point of the arc segment structure that is not symmetrical about the stator center line; or, When the motor rotor rotates clockwise, any point on the arc segment from the second vertex to the midpoint of the tooth shoe arc segment when the tooth shoe is a symmetrical arc structure is used as the starting point of the arc segment structure that is not symmetrical about the stator center line.

7. The method according to any one of claims 1 to 6, characterized in that: The method further comprises: Cutting the tooth shoe using the triangular edge so that the cut tooth shoe has a straight line segment; The length of the straight line segment is L AB Satisfies c×δ≤L AB ≤d×δ, δ is the air gap between the motor stator and rotor; the angle β between the line OA connecting the starting point A of the straight line segment and the center point O of the stator and the center line of the stator satisfies 0<β≤5°, and the value range of OA is R in ≤L OA ≤R in +δ.

8. A method for machining a motor stator, characterized in that: The motor stator comprises a stator yoke, stator teeth and tooth shoes; the stator teeth connect the stator yoke and the tooth shoes, and the tooth shoes comprise a straight line segment structure that is not symmetrical about the stator center line; the method comprises: A coordinate system is established with the center point of the stator as the origin, and the radius of the second auxiliary circle is determined according to the inner diameter of the stator when the tooth shoe is a symmetrical arc structure; the center of the second auxiliary circle is the center of the stator; Determine the center of the first auxiliary circle according to the parameters of the motor and the second auxiliary circle; Determine the radius of the first auxiliary circle according to the length range between a point on the arc segment of the tooth shoe and the center of the first auxiliary circle when the tooth shoe is a symmetrical arc structure; When the stator tooth shoe is a symmetrical arc structure, a starting point of a straight line segment structure that is not symmetrical about the stator center line is determined on the tooth shoe arc segment, and the straight line segment of the first auxiliary circle from the starting point to the intersection with the stator tooth is used as the straight line segment of the tooth shoe that is not symmetrical about the stator center line.

9. A processing device for a motor stator, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the method for machining a motor stator according to any one of claims 1 to 8 when running the program instructions.

10. A motor, characterized in that: include: Rotor; The stator comprises a stator yoke, stator teeth and tooth shoes; the stator teeth connect the stator yoke and the tooth shoes, and the tooth shoes comprise arc segment structures or straight segment structures which are not symmetrical about the stator center line.

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