Method and apparatus for machining a motor stator, motor

Abstract

The application relates to the technical field of compressors, and discloses a machining method for a motor stator, which comprises the following steps: establishing a coordinate system with a stator center point as an origin, determining the radius of a second auxiliary circle according to the inner diameter of the stator when the toothed shoe is a symmetrical circular arc structure; the center of the second auxiliary circle is the stator center point; determining the center of a 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 toothed shoe circular arc segment and the center of the first auxiliary circle when the toothed shoe is a symmetrical circular arc structure; determining the starting point of the circular arc structure which is not symmetrical about the stator center line on the toothed shoe circular arc segment when the toothed shoe is a symmetrical circular arc structure, and taking the circular arc segment from the starting point to the intersection point of the toothed shoe and the stator tooth as the circular arc segment of the toothed shoe which is not symmetrical about the stator center line. The method can improve the machining precision of the toothed shoe structure, thereby reducing the noise of the motor operation. The application further discloses a machining device for motor stator punching sheets and a motor.

Description

Technical Field

[0001] This application relates to the field of compressor technology, for example to a method, apparatus and motor for processing motor stators. Background Technology

[0002] Nowadays, people have increasingly higher requirements for the operating noise of smart home appliances, especially air conditioners. Compressor noise is the main component of air conditioner operating noise, and the compressor motor is the main source of noise from the compressor. 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 lead to a poor user experience when using smart home appliances.

[0003] A related technology discloses an electric motor, comprising: a rotor, wherein the outermost contour of the radial section of the rotor is defined as a contour circle, the center of the contour circle passing through the axis of the rotor; a stator, concentrically arranged with the rotor, the stator including a stator yoke and stator teeth, wherein there are multiple stator teeth, the multiple stator teeth being spaced apart circumferentially on the stator yoke, each stator tooth including a first tooth shoe and a second tooth shoe, the rotor passing through the first tooth shoe and the second tooth shoe sequentially along the rotation direction of the rotor, the minimum distance between the first tooth shoe and the contour circle being L1, the minimum distance between the second tooth shoe and the contour circle being L2, and L1 being greater than L2; along the radial direction of the stator, the minimum thickness of the first tooth shoe being L3, the minimum thickness of the second tooth shoe being L4, and the minimum distance between the cross section of the stator teeth along the radial direction of the stator and the contour circle being L5, satisfying (L4-L3) / L5 less than 3.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] While toothed shoes in related technologies have various deformable structures, high precision is required for their structure during application. Improper toothed shoe structure can exacerbate electromagnetic noise in the motor.

[0006] It should be noted that the information disclosed in the background section above 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 those skilled in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a method, apparatus, and motor for machining motor stators to improve the machining accuracy of the gear shoe structure, thereby reducing the noise during motor operation.

[0009] In some embodiments, the method includes:

[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 based on the inner diameter of the stator when the toothed shoe has a symmetrical circular arc structure; the center of the second auxiliary circle is the center of the stator.

[0011] Determine the center of the first auxiliary circle based on the motor parameters and the second auxiliary circle;

[0012] The radius of the first auxiliary circle is determined based on the range of lengths between the points on the arc segment of the toothed shoe and the center of the first auxiliary circle when the toothed shoe has a symmetrical arc structure.

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

[0014] In some embodiments, the method includes:

[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 based on the inner diameter of the stator when the toothed shoe has a symmetrical circular arc structure; the center of the second auxiliary circle is the center of the stator.

[0016] Determine the center of the first auxiliary circle based on the motor parameters and the second auxiliary circle;

[0017] The radius of the first auxiliary circle is determined based on the range of lengths between the points on the arc segment of the toothed shoe and the center of the first auxiliary circle when the toothed shoe has a symmetrical arc structure.

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

[0019] In some embodiments, the apparatus includes a processor and a memory storing program instructions, the processor being configured to, when executing the program instructions, perform the aforementioned machining method for an electric motor stator.

[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 a circular arc segment structure or a straight line segment structure that is not symmetrical about the stator centerline.

[0021] The processing method, apparatus, and motor for motor stators provided in this disclosure can achieve the following technical effects:

[0022] In this embodiment, a second auxiliary circle is determined based on the symmetrical arc structure of the toothed shoe. Then, a first auxiliary circle is determined based on the second auxiliary circle, motor parameters, and the fact that the toothed shoe has a symmetrical arc structure. Finally, the arc segment where the first auxiliary circle intersects with the stator teeth is taken as the non-symmetrical arc segment of the toothed shoe about the stator centerline. Thus, the asymmetrical arc segment of the toothed shoe can be determined relatively accurately using a feasible method. This helps improve the machining accuracy of the toothed shoe structure, thereby reducing motor operating noise.

[0023] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0024] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

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

[0026] Figure 2 This is a schematic diagram of the structure of an electric motor provided in an embodiment of this disclosure;

[0027] Figure 3 This is a schematic diagram of a processing method for motor stator laminations provided in an embodiment of this disclosure;

[0028] Figure 4 This is a schematic diagram of the stator structure of an electric motor when the rotor rotates counterclockwise, according to an embodiment of this disclosure.

[0029] Figure 5 This is a schematic diagram of the stator structure of an electric motor rotor when it rotates clockwise, provided in an embodiment of this disclosure;

[0030] Figure 6 This is a schematic diagram of a method for determining the starting point of an asymmetrical arc segment in a processing method for motor stator laminations provided in this embodiment of the present disclosure;

[0031] Figure 7 This is a simulation diagram of motor output torque provided in an embodiment of this disclosure;

[0032] Figure 8 This is a schematic diagram of another processing method for motor stator laminations provided in this embodiment of the disclosure;

[0033] Figure 9This is a schematic diagram of a triangular cutting structure in a processing method for motor stator laminations provided in an embodiment of this disclosure;

[0034] Figure 10 This is a partially enlarged structural diagram of triangular cutting in a processing method for motor stator laminations provided in an embodiment of this disclosure;

[0035] Figure 11 This is another simulation diagram of motor output torque provided in this embodiment of the disclosure;

[0036] Figure 12 This is a schematic diagram of another processing method for motor stator laminations provided in this embodiment of the disclosure;

[0037] Figure 13 This is a schematic diagram of a processing apparatus for motor stator laminations provided in an embodiment of this disclosure.

[0038] Figure label:

[0039] 1: Yoke; 2: Stator tooth; 3: Tooth shoe; 4: First auxiliary circle; 5: Second auxiliary circle. Detailed Implementation

[0040] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0041] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

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

[0043] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0044] 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.

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

[0046] Combination Figure 1 As shown, the stator teeth in the prior art are symmetrical arc segments. When the motor rotor rotates, the force on the stator teeth is affected by the direction of rotation, and the force usually increases gradually with the direction of motor rotation. This results in uneven force distribution on the stator teeth, with one side of the stator teeth experiencing greater force and the other side experiencing less force. This imbalance in the force on the teeth leads to large fluctuations in the motor's output torque, generating significant electromagnetic noise. This further leads to significant mechanical vibration, which is transmitted to the compressor structure, causing substantial compressor vibration and noise. Assuming the rotor rotates counterclockwise, then... Figure 1 The force at point P1 of the stator tooth shoe is greater than the force at point P3, and the force on the entire tooth shoe is inconsistent.

[0047] To solve the stress problem of the toothed shoe, combined with Figure 2 The motor disclosed in this embodiment 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 a circular arc structure or a straight line structure that is not symmetrical about the stator centerline. Not symmetrical about the stator centerline means that the center O' of the circle containing the circular arc structure does not coincide with the stator center point O (e.g., ...). Figure 4 , 5 (As shown). The thickness of the toothed shoe gradually increases with the direction of rotation, thus creating an uneven air gap between the stator and rotor. Optionally, the toothed shoe may also include a circular arc segment structure symmetrical about the stator centerline. In this case, the toothed shoe includes two parts: a symmetrical circular arc structure and a circular arc structure or a straight line structure that is not symmetrical about the stator centerline.

[0048] Figure 2 In the diagram, as the motor rotor rotates counterclockwise, the air gap clearly decreases gradually with the direction of rotation. Asymmetrical toothed shoes can effectively reduce the output torque fluctuation of a permanent magnet motor, thereby reducing vibration and noise during motor operation. However, if the asymmetrical structure is not properly manufactured, the motor torque fluctuation will not only fail to be significantly reduced; in some specific asymmetrical structures, the motor torque fluctuation may even increase, leading to further deterioration of motor vibration and noise.

[0049] To effectively improve the machining accuracy of the asymmetrical toothed shoe structure, combined with Figure 3 As shown, this disclosure provides a method for processing a motor stator, including:

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

[0051] S102, the processor determines the center of the first auxiliary circle based on the parameters of the motor and the second auxiliary circle.

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

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

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

[0055] 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 (including the center O and radius R2) are determined. The centerline of any stator tooth is taken as the Y-axis, and the corresponding tooth shoe is the target tooth shoe for which the asymmetrical 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 and the radius depending on the stator inner diameter of the symmetrical tooth shoe (the stator inner diameter is the radius of the stator inner circle). The center of the asymmetrical arc structure lies within the stator inner diameter circle and is at a certain distance from the stator center point. Therefore, the center of the circle containing the asymmetrical structure must exist on a ring at a certain distance from the stator center point; this 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. Furthermore, motor parameters such as rotation direction and rotor pole number will affect the position of the center of the first auxiliary circle. Therefore, the center of the first auxiliary circle is determined comprehensively based on the second auxiliary circle and the motor parameters.

[0056] The arc segment of the first auxiliary circle constitutes the asymmetrical arc structure of the toothed shoe. Therefore, within the length range of the arc segment of the first auxiliary circle (where the toothed shoe has a symmetrical arc structure), there must exist a radius R1 of the first auxiliary circle. Here, the center O' of the first auxiliary circle does not coincide with the stator center point O, so the length from the center O' to each point of the arc segment of the symmetrical toothed shoe is different, forming a range of values. The radius of the first auxiliary circle falls within this range of values.

[0057] After determining the parameters of the first auxiliary circle, the position of the asymmetrical arc on the toothed shoe, i.e., the starting point, needs to be determined. It should be noted that the toothed shoe includes an arc structure that is not symmetrical about the stator centerline. The toothed shoe may consist only of this asymmetrical arc segment, or it may include a first arc segment and a second arc segment. The first arc segment is symmetrical, and the second arc segment is asymmetrical. Therefore, on the arc segment of the toothed shoe when it has a symmetrical arc structure, the starting point of the arc segment structure that is not symmetrical about the stator centerline is determined. If the starting point is at the end of the symmetrical arc structure, then the toothed shoe includes only the asymmetrical arc segment. Otherwise, the toothed shoe includes two arc segments. The endpoint of the asymmetrical arc structure is the intersection of the first auxiliary circle and the stator tooth. Before the toothed shoe is determined, the first auxiliary circle and the stator tooth have an intersection point; then, the toothed shoe is formed based on the starting point, the endpoint, and the arc of the first auxiliary circle.

[0058] It should be noted that the above steps only determine one of the multiple stator tooth shoes. Repeating the above steps will determine the tooth shoe structure corresponding to the other stator teeth.

[0059] The machining method for motor stators provided in this disclosure determines a second auxiliary circle based on the symmetrical arc structure of the toothed shoe. Then, based on the second auxiliary circle, motor parameters, and the symmetrical arc structure of the toothed shoe, a first auxiliary circle is determined. Finally, the arc segment where the first auxiliary circle intersects with the stator teeth is taken as the non-symmetrical arc segment of the toothed shoe about the stator centerline. In this way, the asymmetrical arc segment of the toothed shoe can be determined relatively accurately using a feasible method. This helps improve the machining accuracy of the toothed shoe structure, thereby reducing the noise during motor operation.

[0060] Optionally, in step S101, the processor determines the radius of the second auxiliary circle based on the stator inner diameter when the toothed shoe has a symmetrical circular arc structure, including:

[0061] a×R in ≤R2≤b×R in .

[0062] Among them, R in R1 is the stator inner diameter of the toothed shoe in the symmetrical structure, R2 is the radius of the second auxiliary circle, and a and b are constants less than 1.

[0063] R inThe radius of the stator inner diameter circle (see...) Figure 1 Preferably, the values ​​of a and b are in the range of (0.25, 0.75). The radius R2 of the second auxiliary circle satisfies 0.25 × R in ≤R²≤0.75×R in At that time, the motor torque pulsation corresponding to the determined toothed shoe structure is smaller.

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

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

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

[0067] S123, within the initial position range, the processor takes the point located on the arc of the second auxiliary circle, and whose angle between the line connecting it to 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, with the stator and rotor of the motor fixed, the spatial angle occupied by each stator tooth and each pole of the rotor can be calculated; thus, the angle difference between the two can be obtained. Typically, the number of poles on 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 toothed shoe gradually increases with the direction of rotation; therefore, the direction of change in the toothed shoe thickness varies depending on the direction of rotation of the motor rotor. For example... Figure 4 , 5 For the uppermost toothed shoe of the stator, the centers of the asymmetrical arc segments of the rotor corresponding to the toothed shoe in different rotation directions lie in different quadrants of the coordinate system. After determining the initial position range of the center of the first auxiliary circle, a point is found 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 aforementioned angle difference. This point is the center of the first auxiliary circle.

[0070] Optionally, in step S121, the processor obtains the angle difference between the first spatial angle occupied by each stator tooth of the motor and the 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] Processor calculates angle difference

[0073] In compressors, motors typically employ a 6-slot 4-pole, 9-slot 6-pole, or 12-slot 8-pole configuration, with corresponding angle differences θ of 30°, 20°, and 15°, respectively; the stators in the attached diagram all have a 12-slot structure.

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

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

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

[0077] Combination Figure 4 and Figure 5 When the motor rotor rotates clockwise, the thickness of the toothed shoe gradually increases with the direction of rotation, and the uneven air gap 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 must be located in the arc formed by the third quadrant for the 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 included angle in step S123 is greater than or equal to And it is less than or equal to the angle difference.

[0079] Here, let the center of the first auxiliary circle be on the X-axis, and its distance from the stator center point O be D. x The distance from the stator center point O along the Y-axis is D. y The angle (acute angle) between the line connecting the center of the first auxiliary circle and the center of the second auxiliary circle and the Y-axis is: The range of values ​​for this included angle is: Thus, the asymmetrical arc segment of the toothed shoe, defined within the included angle range, allows the motor torque ripple to decrease more significantly, resulting in smaller torque ripple.

[0080] Optionally, in step S103, the processor determines the radius of the first auxiliary circle based on the length range between a point on the arc segment of the toothed shoe and the center of the first auxiliary circle when the toothed shoe has a symmetrical arc structure, including:

[0081] When the motor rotor rotates counterclockwise, the range of lengths from the first vertex and midpoint of the arc segment of the toothed shoe to the center of the first auxiliary circle when the toothed shoe has a symmetrical arc structure is taken as the range of radius values ​​for the first auxiliary circle.

[0082] When the motor rotor rotates clockwise, the range of lengths from the second vertex and midpoint of the arc segment of the toothed shoe to the center of the first auxiliary circle when the toothed shoe has a symmetrical arc structure is taken as the range of radius values ​​for the first auxiliary circle.

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

[0084] Here, with Figure 6 Taking the counterclockwise rotation of the rotor 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 the following value: P is any point on the arc segment from the first vertex to the midpoint, i.e., the starting point of the asymmetrical arc segment. If the length range from the midpoint and the second vertex to the center of the first auxiliary circle is taken as the radius range of the first auxiliary circle, then an unequal air gap cannot be formed between the asymmetrical arc of the toothed shoe and the rotor. Therefore, the goal of reducing vibration and noise during motor operation cannot be achieved. In other words, when the rotor rotates counterclockwise, the values ​​within the length range from the first vertex and the midpoint to the center of the first auxiliary circle are generally greater than the values ​​within the length range from the midpoint and the second vertex to the center of the first auxiliary circle. A larger radius for the first auxiliary circle ensures a common area between the first auxiliary circle and the stator teeth, allowing for the formation of an unequal air gap between the toothed shoe and the rotor.

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

[0086]

[0087] The above principles and calculation methods also apply to the case where the motor rotor rotates clockwise, and will not be repeated here.

[0088] Optionally, in step S104, the processor determines the starting point of a circular arc segment structure that is not symmetrical about the stator centerline on the circular arc segment of the toothed shoe when the toothed shoe has a symmetrical circular arc structure, including:

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

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

[0091] Here, the definitions of the first vertex, second vertex, and midpoint are as described above. To achieve better electromagnetic performance and lower torque ripple in the motor, the asymmetrical arc segment of the toothed shoe should have a larger proportion of weight. Therefore, the starting point of the asymmetrical arc segment is determined on the arc segment from the first vertex / second vertex to the midpoint. This ensures that the length of the asymmetrical arc segment of the toothed shoe is greater than the length of the symmetrical 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. Thus, the toothed shoe only includes the asymmetrical arc segment.

[0092] The toothed shoe structure determined through the above embodiments enables the motor to have better electromagnetic performance and less output torque ripple. The output torque of the motor in the existing solution and this solution are as follows: Figure 7 As shown in the simulation comparison graph, it is clear that under the same current, the average output torque of the motor in this scheme is almost not reduced compared to the average output torque of the existing scheme, but the peak-to-peak value of the motor output torque decreases from 0.7259 Nm to 0.3752 Nm, and the output torque ripple decreases from 20.33% to 10.60%. In the figure, the solid line represents the motor output torque of this scheme, and the dashed line represents the motor output torque of the existing scheme.

[0093] Combination Figure 8 As shown, this disclosure provides another method for processing a motor stator, including:

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

[0095] S102, the processor determines the center of the first auxiliary circle based on the parameters of the motor and the second auxiliary circle.

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

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

[0098] S205, the processor uses the sides of a triangle to cut the toothed shoe so that the cut toothed shoe has a straight segment.

[0099] Wherein, the length L of the straight line segment AB Satisfying c×δ≤L AB ≤d×δ, where δ is the air gap between the stator and rotor of the motor; the angle β between the line OA connecting the starting point A of the straight 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 this embodiment of the disclosure, to better and more effectively reduce motor output torque ripple, the toothed shoe determined by the above method is cut with a triangle. See also Figure 9 (The motor rotor rotates counterclockwise) Figure 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 are in the range of [8, 11], and the air gap δ in a conventional permanent magnet motor is in the range of [0.40mm, 0.75mm].

[0101] This disclosure further reduces torque ripple, enabling a more significant reduction in motor output torque ripple. Taking a 12-slot 8-pole motor as an example, when L... OA =R in +δ, β = 1°, L AB When =11×δ, the motor output torque is as follows Figure 11 As shown. With Figure 8 In comparison, the output torque ripple of the motor is reduced to a greater extent, thereby further reducing motor noise and compressor noise and vibration.

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

[0103] Combination Figure 12 As shown, this disclosure provides another method for processing a motor stator, including:

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

[0105] S102, the processor determines the center of the first auxiliary circle based on the parameters of the motor and the second auxiliary circle.

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

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

[0108] In this embodiment, the asymmetrical structure of the toothed shoe is a straight line structure. The toothed shoe may consist only of a straight line segment, or it may include a symmetrical arc segment and a straight line segment. The method described above is also applicable to toothed shoes with straight line segments, and the straight line segments of the toothed shoe can also be triangularly cut, which will not be elaborated here.

[0109] Combination Figure 13 As shown, this embodiment of the present disclosure provides a processing apparatus 200 for a motor stator, including a processor 100 and a memory 101. Optionally, the apparatus may further include a communication interface 102 and a bus 103. The processor 100, communication interface 102, and memory 101 can communicate with each other via the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can call logical instructions in the memory 101 to execute the processing method for a motor stator described in the above embodiment.

[0110] Furthermore, the logic instructions in the aforementioned memory 101 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

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

[0112] The memory 101 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 101 may include high-speed random access memory and may also include non-volatile memory.

[0113] like Figure 2As shown, this disclosure provides an electric 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, and the tooth shoes include circular arc segments or straight line segments that are not symmetrical about the stator centerline. The tooth shoes are obtained by processing using a processing device 200 for the motor stator.

[0114] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for machining an electric motor stator.

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

[0116] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0117] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0118] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

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

[0120] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending 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 blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for machining an electrical machine stator, characterized in that, The motor stator comprises a stator yoke, a stator tooth and a tooth shoe; the stator tooth connects the stator yoke and the tooth shoe; the tooth shoe comprises a circular arc structure which is not symmetrical about the center line of the stator; the method comprises: A coordinate system is established with the stator center point as the origin, and the radius of the second auxiliary circle is determined according to the inner diameter of the stator when the toothed gear is a symmetrical circular arc structure; the center of the second auxiliary circle is the stator center point; wherein the radius R2 of the second auxiliary circle satisfies: a x R in ≤ R2 ≤ b x R in ; R in is the inner diameter of the stator when the toothed gear is a symmetrical structure, and a and b are both constants less than 1. According to the parameters of the motor and the second auxiliary circle, the center of the first auxiliary circle is determined; it comprises: obtaining the angle difference between the first space angle occupied by each stator tooth of the motor and the second space angle occupied by each pole of the rotor; according to the rotation direction of the motor rotor, the preliminary position range of the center of the first auxiliary circle is determined; in the preliminary position range, the point located on the second auxiliary circle arc and having an included angle with the connection line of the center of the second auxiliary circle and the Y axis of the coordinate system less than or equal to the angle difference is taken as the center of the first auxiliary circle; According to the length range of each point on the tooth shoe circular arc segment when the tooth shoe is a symmetrical circular arc structure and the center of the first auxiliary circle, the radius of the first auxiliary circle is determined; When the tooth shoe is a symmetrical circular arc structure, the starting point of the non-symmetrical circular arc structure about the center line of the stator is determined on the tooth shoe circular arc segment, and the circular arc segment from the starting point to the intersection point with the stator tooth is taken as the non-symmetrical circular arc segment of the tooth shoe about the center line of the stator.

2. The method of claim 1, wherein, According to the rotation direction of the motor rotor, the preliminary position range of the center of the first auxiliary circle is determined, which comprises: In the case that the motor rotor rotates clockwise, the preliminary position range of the center of the first auxiliary circle is determined as the third quadrant of the coordinate axis; or, In the case that the motor rotor rotates counterclockwise, the preliminary position range of the center of the first auxiliary circle is determined as the fourth quadrant of the coordinate axis.

3. The method of claim 1, wherein, According to the length range of each point on the tooth shoe circular arc segment when the tooth shoe is a symmetrical circular arc structure and the center of the first auxiliary circle, the radius of the first auxiliary circle is determined, which comprises: In the case that the motor rotor rotates counterclockwise, the length range from the first vertex and the midpoint of the tooth shoe circular arc segment when the tooth shoe is a symmetrical circular arc structure to the center of the first auxiliary circle is taken as the radius value range of the first auxiliary circle; or, In the case that the motor rotor rotates clockwise, the length range from the second vertex and the midpoint of the tooth shoe circular arc segment when the tooth shoe is a symmetrical circular arc structure to the center of the first auxiliary circle is taken as the radius value range of the first auxiliary circle; Wherein, the midpoint refers to the intersection point of the tooth shoe circular arc segment and the center line of the stator, the first vertex is the left vertex of the tooth shoe, and the second vertex is the right vertex of the tooth shoe.

4. The method of claim 1, wherein, When the tooth shoe is a symmetrical circular arc structure, the starting point of the non-symmetrical circular arc structure about the center line of the stator is determined on the tooth shoe circular arc segment, which comprises: In the case that the motor rotor rotates counterclockwise, any point on the circular arc segment from the first vertex to the midpoint of the tooth shoe circular arc segment when the tooth shoe is a symmetrical circular arc structure is taken as the starting point of the non-symmetrical circular arc structure about the center line of the stator; or, In the case that the motor rotor rotates clockwise, any point on the circular arc segment from the second vertex to the midpoint of the tooth shoe circular arc segment when the tooth shoe is a symmetrical circular arc structure is taken as the starting point of the non-symmetrical circular arc structure about the center line of the stator.

5. The method according to any one of claims 1 to 4, characterized in that, The method further comprises: The tooth shoe is cut by using a triangular side, so that the cut tooth shoe has a straight line segment; Wherein, the length L of the straight line segment AB satisfies , is the air gap between the motor stator and the rotor; the angle β between the straight line segment OA connecting the starting point A of the straight line segment and the stator center point O and the stator center line satisfies 0 < β ≤ 5°, and the length L of the straight line segment OA satisfies OA ; c and d are constants. ; c and d are constants.

6. A method for machining an electrical machine stator, characterized in that, The motor stator comprises a stator yoke, a stator tooth and a tooth shoe; the stator tooth connects the stator yoke and the tooth shoe; the tooth shoe comprises a straight line segment structure which is not symmetrical about the center line of the stator; 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 toothed gear is a symmetrical circular arc structure; the center of the second auxiliary circle is the center of the stator; wherein the radius R2 of the second auxiliary circle satisfies: a x R in ≤ R2 ≤ b x R in ; R in is the inner diameter of the stator when the toothed gear is a symmetrical structure, and a and b are both constants less than 1. The method comprises the following steps: obtaining the angle difference between the first space angle occupied by each stator tooth of the motor and the second space angle occupied by each pole of the rotor; determining the preliminary position range of the center of the first auxiliary circle according to the rotation direction of the rotor; and taking the point on the arc of the second auxiliary circle and having the included angle between the line connecting the point and the center of the second auxiliary circle and the Y-axis of the coordinate system less than or equal to the angle difference as the center of the first auxiliary circle. The radius of the first auxiliary circle is determined according to the length range between the point on the arc of the symmetrical circular arc structure of the toothed shoe and the center of the first auxiliary circle. When the stator toothed shoe is of the symmetrical circular arc structure, the starting point of the straight line segment structure not symmetrical about the center line of the stator is determined on the arc segment of the toothed shoe, and the straight line segment from the starting point to the intersection point of the first auxiliary circle and the stator tooth is taken as the straight line segment of the toothed shoe not symmetrical about the center line of the stator.

7. A machining apparatus for a stator of an electric machine comprising a processor and a memory having stored program instructions, characterised in that, The processor is configured to execute the processing method for the motor stator as claimed in any one of claims 1 to 6 when the program instructions are run.

8. An electric machine characterized by The motor stator processing device comprises: a rotor; a stator comprising a stator yoke, a stator tooth and a toothed shoe; the stator tooth connects the stator yoke and the toothed shoe; the toothed shoe comprises a circular arc segment structure or a straight line segment structure not symmetrical about the center line of the stator; and the toothed shoe is processed by the motor stator processing device of claim 7.

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