Processing method and processing apparatus for motor stator, and motor

Abstract

The present application relates to the technical field of compressors, and discloses a processing method for a motor stator. The method comprises: taking the center point of a stator as an origin to establish a coordinate system, and on the basis of the inner diameter of the stator when tooth shoes are of a symmetrical arc structure, determining the radius of a second auxiliary circle, wherein the center of the second auxiliary circle is the center point of the stator; determining the center of a first auxiliary circle on the basis of parameters of a motor and the second auxiliary circle; on the basis of a length range between each point on arc sections of the tooth shoes when the tooth shoes are of a symmetrical arc structure and the center of the first auxiliary circle, determining the radius of the first auxiliary circle; and determining, on the arc sections of the tooth shoes when the tooth shoes are of a symmetrical arc structure, a starting point of an arc structure which is not symmetrical about the center line of the stator, and taking arc sections of the first auxiliary circle from the starting point to intersections with stator teeth as arc sections of the tooth shoes which are not symmetrical about the center line of the stator. The method can improve the processing precision of tooth shoe structures, thereby reducing the operation noise of motors. The present application further discloses a processing apparatus for motor stator punching and a motor.

Description

Processing method and device for motor stator, and motor

[0001] This application is based on the Chinese patent application with application number 202310962063.4 and application date August 1, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0002] The present application relates to the technical field of compressors, for example, to a processing method and device for a motor stator, and a motor. Background Art

[0003] Nowadays, people are increasingly demanding the operating noise of smart home appliances, especially air conditioners. Compressor noise is the primary component of air conditioner operating noise, and the compressor motor is the primary source of compressor noise. Motor noise is primarily categorized into three types: electromagnetic noise, mechanical noise, and aerodynamic noise. Electromagnetic noise has the greatest impact on motor noise. Excessive electromagnetic noise inevitably leads to a poor user experience when using smart home appliances.

[0004] 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, arranged concentrically with the rotor, the stator comprising a stator yoke and stator teeth, the stator teeth being multiple, and the multiple stator teeth being arranged on the stator yoke at intervals along the circumference of the stator yoke, the stator teeth comprising a first tooth shoe and a second tooth shoe, and the rotor passing through the first tooth shoe and the second tooth shoe in sequence along the rotation direction of the rotor, the minimum spacing between the first tooth shoe and the contour circle is L1, 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, the minimum thickness of the second tooth shoe is L4, the minimum spacing between the cross-section of the stator teeth along the radial direction of the stator and the contour circle is L5, satisfying (L4-L3) / L5 is less than 3.

[0005] During the implementation of the embodiments of the present disclosure, it was found that at least the following problems exist in the related art:

[0006] The toothed boots in related technologies have various deformable structures, but in application, the toothed boots have high structural precision requirements. Improper toothed boot structures can worsen the electromagnetic noise of the motor.

[0007] 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 this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this field.

[0008] Summary of the Invention

[0009] 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 elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0010] The embodiments of the present disclosure provide a method, an apparatus, and a motor for machining a motor stator, so as to improve the machining accuracy of a tooth shoe structure and thereby reduce noise during motor operation.

[0011] In some embodiments, the method comprises:

[0012] 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 based on 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;

[0013] Determine the center of the first auxiliary circle according to the parameters of the motor and the second auxiliary circle;

[0014] 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;

[0015] 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, 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.

[0016] In some embodiments, the method comprises:

[0017] 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 based on 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;

[0018] Determine the center of the first auxiliary circle according to the parameters of the motor and the second auxiliary circle;

[0019] 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;

[0020] When the stator tooth shoe has 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.

[0021] In some embodiments, the apparatus includes: a processor and a memory storing program instructions, wherein the processor is configured to execute the aforementioned method for machining a motor stator when running the program instructions.

[0022] 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.

[0023] The motor stator machining method, device, and motor provided by the embodiments of the present disclosure can achieve the following technical effects:

[0024] In the disclosed embodiment, a second auxiliary circle is determined based on the tooth shoe having a symmetrical arc structure. Furthermore, a first auxiliary circle is determined based on the second auxiliary circle, motor parameters, and the fact that the tooth shoe is an arc with a symmetrical arc structure. Finally, the arc segment where the first auxiliary circle intersects with the stator teeth is used as the tooth shoe's arc segment that is not symmetrical about the stator centerline. In this way, the asymmetric arc segment of the tooth shoe can be more accurately determined using a feasible method. This helps improve the machining accuracy of the tooth shoe structure, thereby reducing the noise during motor operation.

[0025] 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

[0026] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0027] FIG1 is a schematic diagram of a stator structure in the prior art;

[0028] FIG2 is a schematic structural diagram of a motor provided by an embodiment of the present disclosure;

[0029] FIG3 is a schematic diagram of a method for processing a motor stator punching sheet provided by an embodiment of the present disclosure;

[0030] FIG4 is a schematic diagram of the stator structure of a motor provided by an embodiment of the present disclosure when the rotor rotates counterclockwise;

[0031] FIG5 is a schematic diagram of the stator structure of a motor provided by an embodiment of the present disclosure when the rotor rotates clockwise;

[0032] FIG6 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;

[0033] FIG7 is a schematic diagram of a motor output torque simulation provided by an embodiment of the present disclosure;

[0034] FIG8 is a schematic diagram of another method for processing motor stator punching sheets provided by an embodiment of the present disclosure;

[0035] FIG9 is a schematic structural diagram of a triangular cutting method for a motor stator punching sheet provided by an embodiment of the present disclosure;

[0036] FIG10 is a partially enlarged structural diagram of a triangular cutting in a method for processing a motor stator punching sheet provided by an embodiment of the present disclosure;

[0037] FIG11 is another schematic diagram of a motor output torque simulation according to an embodiment of the present disclosure;

[0038] FIG12 is a schematic diagram of another method for processing motor stator punching sheets provided in an embodiment of the present disclosure;

[0039] FIG13 is a schematic diagram of a processing device for motor stator punching provided in an embodiment of the present disclosure.

[0040] Reference numerals: 1: yoke; 2: stator teeth; 3: tooth shoe; 4: first auxiliary circle; 5: second auxiliary circle. DETAILED DESCRIPTION

[0041] In order to be able to understand the features and technical content 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 accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of 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.

[0042] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to describe the embodiments of the present disclosure herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0043] Unless otherwise stated, the term "plurality" means two or more.

[0044] 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 means: A or B.

[0045] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0046] 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.

[0047] As shown in FIG1 , 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 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 vibration and noise. Assuming that the rotor rotates counterclockwise, the force at point P1 of the stator tooth boot shown in FIG1 is greater than the force at point P3, and the force on the entire tooth boot is inconsistent.

[0048] In order to solve the problem of tooth shoe force, in conjunction 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 (as shown in Figures 4 and 5). The thickness of the tooth shoe gradually increases with the direction of rotation, thereby forming an uneven air gap between the stator and the rotor. Optionally, the tooth shoe can also include an arc segment structure that is symmetrical about the stator center line. At this time, the tooth shoe includes two parts: a symmetrical arc structure and an arc structure or a straight line structure that is not symmetrical about the stator center line.

[0049] In Figure 2, the motor rotor rotates counterclockwise, and the air gap clearly decreases with the direction of rotation. Asymmetric tooth boots can effectively reduce the output torque fluctuation of permanent magnet motors, thereby reducing vibration and noise during motor operation. However, improperly manufactured asymmetric structures not only fail to significantly reduce motor torque fluctuation, but in some specific asymmetric structures, torque fluctuation increases, further exacerbating motor vibration and noise.

[0050] In order to effectively improve the machining accuracy of the asymmetric structure of the tooth shoe, in conjunction with FIG3 , an embodiment of the present disclosure provides a machining method for a motor stator, comprising:

[0051] S101, the processor establishes a coordinate system with the stator center point 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 stator center.

[0052] S102: The processor determines the center of the first auxiliary circle according to the parameters of the motor and the second auxiliary circle.

[0053] 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.

[0054] 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.

[0055] As previously mentioned, when the tooth shoe has a symmetrical arc structure, the center of the circle containing the tooth shoe arc segment coincides with the stator center point. When the tooth shoe has an asymmetrical arc structure, the center of the circle containing the tooth shoe arc segment does not coincide with the stator center point. In other words, the arc segment of the tooth shoe that is not symmetrical about the stator centerline 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 containing the asymmetric arc segment (i.e., the first auxiliary circle), that is, determining the center and radius of the circle.

[0056] Specifically, a coordinate system is established with the stator center point 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 stator center point 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 stator inner circle). The center of the asymmetric arc structure is within the stator inner diameter circle and has a certain distance from the stator center point. Therefore, on a circular ring at a certain distance from the stator center point, there must be the center of the circle where the asymmetric structure is located, 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, motor parameters such as the direction of rotation and the number of rotor poles will affect the center position of the first auxiliary circle. Therefore, the center of the first auxiliary circle is comprehensively determined based on the second auxiliary circle and the motor parameters.

[0057] The arc segments of the first auxiliary circle form the asymmetric arc structure of the toothed shoe. Therefore, the radius R1 of the first auxiliary circle must lie within the range between the center point O' of the first auxiliary circle and the length of the arc segment when the toothed shoe is a symmetrical arc structure. Here, the center point O' of the first auxiliary circle does not coincide with the stator center point O. Therefore, the length from the center point O' to each point of the symmetrical toothed shoe arc segment varies, forming an interval. The radius of the first auxiliary circle falls within this interval.

[0058] 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 only include 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, 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. If the starting point is at the end of the symmetrical arc structure, the tooth shoe only includes the 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.

[0059] It should be noted that the above steps only determine one of the multiple tooth shoes of the stator. The tooth shoe structures corresponding to the other stator teeth of the stator can be determined by repeating the above steps.

[0060] Using the machining method for a motor stator provided in an embodiment of the present disclosure, a second auxiliary circle is determined based on the tooth shoe having a symmetrical arc structure. Furthermore, a first auxiliary circle is determined based on the second auxiliary circle, motor parameters, and the fact that the tooth shoe is an arc having a symmetrical arc structure. Finally, the arc segment where the first auxiliary circle intersects with the stator teeth is used as the arc segment of the tooth shoe that is not symmetrical about the stator centerline. 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 during motor operation.

[0061] 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: 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 in is the radius of the stator inner diameter 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 as the center of the first auxiliary circle 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.

[0068] Here, given the motor's stator and rotor, the spatial angle occupied by each stator tooth and each rotor pole can be calculated; this angular difference between the two can then be determined. Typically, the number of rotor poles is less than the number of stator slots, so the angular difference is the difference between the second spatial angle and the first spatial angle. This angular 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. Therefore, the direction of change in the tooth shoe thickness varies depending on the direction of rotation of the motor rotor. As shown in Figures 4 and 5, for the tooth shoe at the top of the stator, the centers of the circles containing the asymmetric arc segments of the corresponding tooth shoes for different rotation directions are located 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 such that the angle between the line connecting this point and 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 rotor pole, 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 compressors, motors usually use slot-pole combinations such as 6-slot 4-pole, 9-slot 6-pole, and 12-slot 8-pole, and the corresponding angle differences θ are 30°, 20°, and 15° respectively; the stators in the attached figures all have 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] Combining Figures 4 and 5, when the motor rotor rotates clockwise, the tooth shoe thickness gradually increases with the direction of rotation, and the uneven air gap formed between the stator and 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, which allows the motor air gap to gradually decrease with the direction of rotation. According to the principle of symmetry, 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 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, at S103, the processor determines the radius of the first auxiliary circle according to a 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 tooth shoe arc segment and the stator center line, the first vertex is the left vertex of the tooth shoe, and the second vertex is the right vertex of the tooth shoe.

[0084] Here, the rotor in FIG6 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. This also fails to achieve the purpose of reducing vibration and noise during motor operation. 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 form unequal air gaps between the determined tooth shoe and the rotor.

[0085] Furthermore, in combination with FIG6 , based on the parameters of the stator and the parameters of the auxiliary circle, it can be determined and Wherein, Bs0 is the stator slot width (see Figure 1).

[0086] The above principles and calculation methods are also applicable to the case where the motor rotor rotates clockwise, and will not be described in detail here.

[0087] Optionally, at 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:

[0088] 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.

[0089] 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.

[0090] 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 shoe, 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 shoe 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 shoe only includes asymmetric arc segments.

[0091] The toothed shoe structure determined by the above embodiment enables the motor to have better electromagnetic performance and smaller output torque pulsation. The output torque of the motor of the existing scheme and the present scheme is shown in Figure 7. It can be clearly found from the simulation comparison diagram that under the same current, the average output torque of the motor of this scheme is almost the same as the average output torque 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 output torque of the motor of this scheme, and the dotted line is the output torque of the motor of the existing scheme.

[0092] 8 , the present disclosure provides another method for machining a motor stator, including:

[0093] S101, the processor establishes a coordinate system with the stator center point 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 stator center.

[0094] S102: The processor determines the center of the first auxiliary circle according to the parameters of the motor and the second auxiliary circle.

[0095] 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.

[0096] 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.

[0097] S205: The processor cuts the tooth shoe using the triangular edge so that the cut tooth shoe has a straight line segment.

[0098] The length of the straight line segment is L AB Satisfying 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 segment and the stator center point O and the stator center line satisfies 0<β≤5°, and the value range of OA is R in ≤L OA ≤R in +δ.

[0099] In this disclosed embodiment, to effectively reduce motor output torque ripple, the tooth boots determined by the above method are cut into triangles. Referring to Figures 9 (rotor rotation counterclockwise) and 10, the triangle is formed by selecting two endpoints, A and B, on the stator teeth, with the stator center point O as one endpoint. The values ​​of c and d range from [8 to 11]. The air gap δ in conventional permanent magnet motors ranges from [0.40 mm to 0.75 mm].

[0100] The disclosed embodiment further reduces torque pulsation and can significantly reduce the motor output torque pulsation. 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 shown in Figure 11. Compared with Figure 8, the motor output torque pulsation is reduced to a greater extent, thereby further reducing the motor noise and compressor noise vibration.

[0101] 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.

[0102] As shown in FIG12 , the embodiment of the present disclosure provides another method for machining a motor stator, including:

[0103] S101, the processor establishes a coordinate system with the stator center point 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 stator center.

[0104] S102: The processor determines the center of the first auxiliary circle according to the parameters of the motor and the second auxiliary circle.

[0105] 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.

[0106] 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.

[0107] In the disclosed embodiment, the asymmetrical structure of the tooth shoe is a straight line structure. The tooth shoe can consist solely of straight line segments, or it can consist of a symmetrical arc segment and a straight line segment. The method described above is also applicable to tooth shoes with straight line segments, and triangular cutting can also be performed on tooth shoes with straight line segments. This will not be further described here.

[0108] As shown in Figure 13, 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 further include a communication interface 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 can communicate with each other through the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can call the logic instructions in the memory 101 to execute the processing method for the motor stator of the above embodiment.

[0109] In addition, the logic instructions in the memory 101 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[0110] The memory 101 is a computer-readable storage medium that can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes the program instructions / modules stored in the memory 101 to perform functional applications and data processing, thereby implementing the motor stator machining method in the above-mentioned embodiments.

[0111] The memory 101 may include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function; the data storage area may store data generated based on the use of the terminal device. Furthermore, the memory 101 may include high-speed random access memory and non-volatile memory.

[0112] As shown in Figure 2, an embodiment of the present disclosure provides a motor comprising a rotor and a stator. The stator comprises a stator yoke, stator teeth, and tooth shoes. The stator teeth connect the stator yoke and tooth shoes. The tooth shoes comprise arc segments or straight segments that are asymmetrical about the stator centerline. The tooth shoes are machined using a machining device 200 for motor stators.

[0113] An embodiment of the present disclosure provides a computer program, which, when executed by a computer, enables the computer to implement the above-mentioned method for machining a motor stator.

[0114] An embodiment of the present disclosure provides a computer program product, which includes computer instructions stored on a computer-readable storage medium. When the program instructions are executed by a computer, the computer is enabled to implement the above-mentioned method for machining a motor stator.

[0115] 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.

[0116] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0117] The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present disclosure. The aforementioned storage medium may be a non-transitory 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 code, or a transient storage medium.

[0118] 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 variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace 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 claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include plural forms. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of one or more associated listings. In addition, when used in this application, the term "comprise" and its variations "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 of these. In the absence of further restrictions, an element defined by the sentence "comprising a..." does not exclude the presence of other identical elements in the process, method or device that includes the element. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments can be referenced 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 be found in the description of the method part.

[0119] 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 to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. The technicians will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0120] 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 merely illustrative. For example, the division of the units can be merely a logical functional division. In actual implementation, there may be other division methods, 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, and can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown 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 to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of the present disclosure may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0121] The flowcharts and block diagrams in the accompanying drawings show the possible implementation architectures, functions and operations of the systems, methods and computer program products according to the embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, program segment or part of the code, and the module, program segment or part of the code contains one or more executable instructions for implementing the specified logical functions. In some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in an order different from that 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, or 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 function or action, 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 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, including: 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 any one of claims 1 to 4, 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 any one of claims 1 to 5, 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.

11. A computer program, when executed by a computer, enables the computer to implement the method for machining a motor stator according to any one of claims 1 to 8.

12. A computer program product, comprising computer instructions stored on a computer-readable storage medium, and when the program instructions are executed by a computer, the computer is enabled to implement the method for machining a motor stator according to any one of claims 1 to 8.

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