A stator core perpendicularity on-line measuring method and device

Abstract

The application discloses a kind of verticality on-line measurement methods of stator core, belong to motor technical field, including the plane equation of fitting plane M on the upper surface of stator core and its normal vector;The straight line equation of fitting straight line L of stator core outer side and its direction vector are calculated;Stator core is rotated multiple times, to obtain several fitting straight lines L;The included angle formed by each fitting straight line L and fitting plane M is calculated, to obtain N included angles;The verticality of stator core is calculated: the minimum value is determined from N included angles, the minimum value determined is brought into, wherein L1=Hm, H is the thickness of stator core lamination, m is the number of stator core lamination.This application only needs to collect the spatial coordinate data points of upper surface and outer side of stator core, then carries out data processing, the verticality of stator core can be obtained, and the accuracy of the verticality of stator core obtained is very high, improves detection efficiency and the accuracy of detection data.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to an online method for measuring the verticality of a stator core and a measuring device for implementing the above-mentioned online method for measuring the verticality of a stator core. Background Technology

[0002] The stator core is a crucial component that forms the magnetic circuit of a motor and secures the stator windings. To reduce hysteresis and eddy current losses in the core, modern high-capacity motor stator cores are often constructed by stacking high-quality cold-rolled silicon steel sheets with high permeability and low losses. The stacked stator core is approximately 200mm high and 250mm to 350mm in diameter. Due to errors in the stacking process and the cold / hot pressing processes, the perpendicularity error of the stator core sometimes exceeds the manufacturer's required technical specifications. Therefore, the perpendicularity of the stator core is a critical parameter for the overall quality of the motor.

[0003] Currently, the perpendicularity of the stator core is mainly measured manually using a perpendicularity testing instrument. Chinese patent document CN103925865B discloses a testing instrument device for detecting the perpendicularity of the end face of a workpiece, which consists of a base, dial indicator, testing spindle, dial indicator stand, testing handwheel, etc. It connects the workpiece to be tested to the workpiece joint, and the maximum difference in the dial indicator reading after rotating the testing handwheel one revolution is taken as the perpendicularity of the workpiece. However, due to the large size of the motor stator core, manual inspection is labor-intensive, costly, inefficient, and prone to errors. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide an efficient and highly accurate online method for measuring the verticality of stator cores.

[0005] The objective of this invention is achieved through the following technical solution: A method for online measurement of stator core perpendicularity includes the following steps: Calculate the plane equation and normal vector of the fitted plane M on the upper surface of the stator core. The upper surface of the stator core is scanned by the first laser displacement sensor to obtain n(n 3) Spatial coordinate data points ( Using the least squares method, plane M is fitted, and the equation of the fitted plane M is: Normal vector ; in, The measured data points are respectively The average value of the coordinates; Calculate the equation of the fitted straight line L on the outer surface of the stator core and its direction vector. The outer surface of the stator core is scanned by a second laser displacement sensor to obtain i(i 2) Spatial coordinate data points ( Using the least squares method, a spatial line L is fitted. The standard form of the equation of the fitted line L is: By performing an equivalent transformation on this equation, we get: in, Direction vector ( Let be any point on the fitted line L; The stator core is rotated multiple times to obtain several fitted straight lines L; Calculate the angle between each fitted line L and the fitted plane M. To obtain N included angles Where i = 1, 2, ..., N: Calculate the perpendicularity of the stator core From the N included angles Determine the minimum value The determined minimum value Substitute Where L1=H m, where H is the thickness of the stator core laminations and m is the number of stator core laminations.

[0006] Furthermore, the equation of the fitted straight line L on the outer surface of the stator core and its direction vector are calculated. In the steps, , , , .

[0007] Furthermore, the equation of the fitted straight line L on the outer surface of the stator core and its direction vector are calculated. Specifically, the following steps are included: Choose one at random Value, based on Find ; Choose any value for C, and according to Find the values ​​of A and B to obtain the direction vector of the fitted line L. .

[0008] The online measurement method for stator core perpendicularity also includes a verification step, which is located after the calculation of the stator core perpendicularity. Following the steps outlined, the specific steps include: The actual perpendicularity of the stator core was measured using a measuring instrument. ， ; Calculate the perpendicularity of the stator core perpendicularity ， The error between; If the error is within the preset range, it means that the stator core is qualified; if the error is not within the preset range, formula (13) should be corrected.

[0009] Furthermore, in the step of rotating the stator core multiple times to obtain several fitted straight lines L, the number of fitted straight lines L is 360° / α, where α is the angle of each rotation of the stator core.

[0010] The present invention also provides an online stator core perpendicularity measuring device for implementing the above-described online stator core perpendicularity measuring method, the online stator core perpendicularity measuring device comprising: The work platform is used to provide a water surface. A turntable, which is rotatably mounted on the working platform; The X-axis moving guide rail is mounted on the working platform; The Y-axis moving guide rail is disposed on the X-axis moving guide rail and can move along the length direction of the X-axis moving guide rail; The Z-axis moving guide rail is mounted on the working platform; A first laser displacement sensor is disposed on the Y-axis moving guide rail and located above the stator core. The first laser displacement sensor can move along the length direction of the Y-axis moving guide rail. The second laser displacement sensor is mounted on the Z-axis moving guide rail and can move along the length of the Z-axis moving guide rail.

[0011] Furthermore, the online stator core verticality measuring device also includes a horizontal moving slide, which is disposed on the working platform and fixedly connected to the Z-axis moving guide rail. The turntable is disposed on the horizontal moving slide and can move along the length direction of the horizontal moving slide, so that the stator core on the turntable moves closer to or further away from the second laser displacement sensor.

[0012] Compared with existing technologies, the online measurement method for stator core perpendicularity of the present invention includes the following steps: calculating the plane equation of the fitting plane M on the upper surface of the stator core and its normal vector. ; Calculate the equation of the fitted straight line L on the outer surface of the stator core and its direction vector. Rotate the stator core multiple times to obtain several fitted straight lines L; calculate the angle between each fitted straight line L and the fitted plane M. To obtain N included angles ; Calculate the perpendicularity of the stator core From N included angles Determine the minimum value The determined minimum value Substitute Where, L1=H Where m and H represent the thickness of the stator core laminations, and m represents the number of stator core laminations. This application only requires collecting spatial coordinate data points of the upper and outer surfaces of the stator core, and then processing the data to obtain the verticality of the stator core. The accuracy of the obtained verticality is very high. Compared with manual inspection methods, it offers higher stability, higher precision, and saves labor costs, significantly improving inspection efficiency and the accuracy of inspection data. This helps to improve the quality control of stator core manufacturing and meet customer needs. Attached Figure Description

[0013] Figure 1 This is a flowchart of the online measurement method for stator core perpendicularity of the present invention; Figure 2 This is a schematic diagram illustrating the measurement principle of the online measurement method for stator core perpendicularity of the present invention. Figure 3 This is a schematic diagram of the online stator core perpendicularity measurement device of the present invention.

[0014] In the diagram: 10, working platform; 20, turntable; 30, X-axis moving guide rail; 40, Y-axis moving guide rail; 50, Z-axis moving guide rail; 60, first laser displacement sensor; 70, second laser displacement sensor; 80, horizontal moving slide; 90, stator core. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or it can be fixed through another intermediate component. When a component is said to be "connected to" another component, it can be directly connected to the other component or it may be fixed through another intermediate component. When a component is said to be "set on" another component, it can be set directly on the other component or it may be set through another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0018] In this embodiment: like Figure 1 As shown, the present invention provides an online method for measuring the verticality of a stator core, comprising the following steps: Calculate the plane equation and normal vector of the fitted plane M on the upper surface of the stator core. The upper surface of the stator core is scanned by the first laser displacement sensor to obtain n(n 3) Spatial coordinate data points ( Using the least squares method, plane M is fitted, and the equation of the fitted plane M is: Normal vector ; in, The measured data points are respectively The average value of the coordinates; Calculate the equation of the fitted straight line L on the outer surface of the stator core and its direction vector. The outer surface of the stator core is scanned by a second laser displacement sensor to obtain i(i 2) Spatial coordinate data points ( Using the least squares method, a spatial line L is fitted. The standard form of the equation of the fitted line L is: By performing an equivalent transformation on this equation, we get: in, Direction vector ( Let be any point on the fitted line L; The stator core is rotated multiple times to obtain several fitted straight lines L; Calculate the angle between each fitted line L and the fitted plane M. To obtain N included angles Where i = 1, 2, ..., N: Calculate the perpendicularity of the stator core From N included angles Determine the minimum value The determined minimum value Substitute, measurement principle as follows Figure 2 As shown, where L1=H m, where H is the thickness of the stator core laminations and m is the number of stator core laminations.

[0019] In the steps of calculating the plane equation and normal vector of the fitted plane M on the upper surface of the stator core: a point in space The distance to the fitting plane M is: Flatness (F) is the deviation of the macroscopic convexity of a plane from an ideal plane, and can be expressed as: Where d is the distance from each measurement point to the ideal plane. It is important to note that the distance d is not an absolute value; it can be positive or negative. A positive value indicates that the point is on the right side of the plane, and a negative value indicates that it is on the left side.

[0020] The equation of the fitted straight line L on the outer surface of the stator core and its direction vector are calculated. In the steps: , , , .

[0021] The specific steps are as follows: Choose one at random Value, based on Find ; Choose any value for C, and according to Find the values ​​of A and B to obtain the direction vector of the fitted line L. In this embodiment, C is set to 1.

[0022] In the step of rotating the stator core multiple times to obtain several fitted straight lines L: the number of fitted straight lines L is 360° / α, where α is the angle of each rotation of the stator core.

[0023] The online measurement method for stator core perpendicularity also includes a verification step, which is located within the calculation of stator core perpendicularity. Following the steps outlined, the specific steps include: The actual perpendicularity of the stator core was measured using a measuring instrument. ， ; Calculate the perpendicularity of the stator core perpendicularity ， The error between; If the error is within the preset range, it means that the stator core is qualified; if the error is not within the preset range, formula (13) should be corrected.

[0024] This invention obtains the stator core perpendicularity by performing planar fitting and linear fitting on the stator core, first calculating the angle between the line and the plane, and then selecting the smallest angle for further calculation. This application only requires collecting spatial coordinate data points from the upper and outer surfaces of the stator core, followed by data processing, to obtain the stator core perpendicularity. The obtained perpendicularity is highly accurate, offering higher stability and precision compared to manual inspection methods, saving labor costs, significantly improving inspection efficiency and data accuracy, and contributing to better control over stator core manufacturing quality, thus meeting customer needs.

[0025] like Figure 3 As shown, the present invention also provides an online stator core perpendicularity measuring device for implementing the above-mentioned online stator core perpendicularity measuring method, comprising: Work platform 10 is used to provide a water platform surface; Turntable 20 is rotatably mounted on work platform 10; The X-axis moving guide rail 30 is mounted on the work platform 10; Y-axis moving guide 40 is set on X-axis moving guide 30 and can move along the length direction of X-axis moving guide 30; Z-axis moving guide rail 50 is set on the work platform 10; A first laser displacement sensor 60 is mounted on the Y-axis moving guide rail 40 and positioned above the stator core 90. The first laser displacement sensor 60 can move along the length of the Y-axis moving guide rail 40 to scan and acquire points on the upper surface of the stator core 90, thereby obtaining n(n... 3) Spatial coordinate data points ( ); The second laser displacement sensor 70, mounted on the Z-axis moving guide rail 50 and movable along the length of the Z-axis moving guide rail 50, is used to scan and acquire points on the outer surface of the stator core 90 to obtain i(i 2) Spatial coordinate data points ( ).

[0026] In a preferred embodiment, the stator core verticality online measuring device further includes a horizontal moving slide 80, which is disposed on the working platform 10 and fixedly connected to the Z-axis moving guide rail 50. The turntable 20 is disposed on the horizontal moving slide 80 and can move along the length direction of the horizontal moving slide 80 so that the stator core 90 on the turntable 20 moves closer to or further away from the second laser displacement sensor 70.

[0027] This device, by setting up two laser displacement sensors, can quickly and accurately measure the stator core 90, improving the automation level of workpiece inspection, while avoiding damage caused by contact measurement, making the whole operation simpler and more flexible.

[0028] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the concept of the present invention. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of these fall within the protection scope of the present invention.

Claims

1. A method for online measurement of stator core perpendicularity, characterized in that: Includes the following steps: Calculate the plane equation and normal vector of the fitted plane M on the upper surface of the stator core. The upper surface of the stator core is scanned by the first laser displacement sensor to obtain n(n 3) Spatial coordinate data points ( Using the least squares method, plane M is fitted, and the equation of the fitted plane M is: Normal vector ; in, The measured data points are respectively The average value of the coordinates; Calculate the equation of the fitted straight line L on the outer surface of the stator core and its direction vector. The outer surface of the stator core is scanned by a second laser displacement sensor to obtain i(i 2) Spatial coordinate data points ( Using the least squares method, a spatial line L is fitted. The standard form of the equation of the fitted line L is: By performing an equivalent transformation on this equation, we get: in, Direction vector ( Let be any point on the fitted line L; The stator core is rotated multiple times to obtain several fitted straight lines L; Calculate the angle between each fitted line L and the fitted plane M. To obtain N included angles Where i = 1, 2, ..., N: Calculate the perpendicularity of the stator core From the N included angles Determine the minimum value The determined minimum value Substitute Where, L1=H m, where H is the thickness of the stator core laminations and m is the number of stator core laminations.

2. The method for online measurement of stator core perpendicularity according to claim 1, characterized in that: The equation of the fitted straight line L on the outer surface of the stator core and its direction vector are calculated. In the steps, , , , .

3. The online measurement method for stator core perpendicularity according to claim 2, characterized in that: The equation of the fitted straight line L on the outer surface of the stator core and its direction vector are calculated. Specifically, the following steps are included: Choose one at random Value, based on Find ; Choose any value for C, and according to Find the values ​​of A and B, and thus obtain the direction vector of the fitted line L. .

4. The method for online measurement of stator core perpendicularity according to claim 1, characterized in that: In the step of rotating the stator core multiple times to obtain several fitted straight lines L, the number of fitted straight lines L is 360° / α, where α is the angle of each rotation of the stator core.

5. The method for online measurement of stator core perpendicularity according to claim 1, characterized in that: The online measurement method for stator core perpendicularity also includes a verification step, which is located after the calculation of the stator core perpendicularity. Following the steps above, the specific steps include: The actual perpendicularity of the stator core was measured using a measuring instrument. ， ; Calculate the perpendicularity of the stator core perpendicularity ， The error between; If the error is within the preset range, it means that the stator core is qualified; if the error is not within the preset range, formula (13) should be corrected.

6. An online measuring device for the verticality of a stator core, characterized in that: The online stator core perpendicularity measuring device is used to implement the online stator core perpendicularity measuring method as described in any one of claims 1 to 5, and the online stator core perpendicularity measuring device comprises: The work platform is used to provide a water surface. A turntable, which is rotatably mounted on the working platform; The X-axis moving guide rail is mounted on the working platform; The Y-axis moving guide rail is disposed on the X-axis moving guide rail and can move along the length direction of the X-axis moving guide rail; The Z-axis moving guide rail is mounted on the working platform; A first laser displacement sensor is disposed on the Y-axis moving guide rail and located above the stator core. The first laser displacement sensor can move along the length direction of the Y-axis moving guide rail. The second laser displacement sensor is mounted on the Z-axis moving guide rail and can move along the length of the Z-axis moving guide rail.

7. The online stator core perpendicularity measuring device according to claim 6, characterized in that: The online stator core verticality measuring device further includes a horizontal moving slide, which is disposed on the working platform and fixedly connected to the Z-axis moving guide rail. The turntable is disposed on the horizontal moving slide and can move along the length direction of the horizontal moving slide, so that the stator core on the turntable moves closer to or further away from the second laser displacement sensor.

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