CN-122015649-A - Method and system for detecting double-view-angle size of motor core of automobile

CN122015649ACN 122015649 ACN122015649 ACN 122015649ACN-122015649-A

Abstract

The invention discloses a method and a system for detecting double-view dimensions of an automobile motor iron core, wherein an iron core workpiece is vertically placed, a plurality of groups of outer ring width data are collected through the rotation of a first visual camera on the side surface and the iron core workpiece, an outer ring ellipse model is established, and the center of an outer ring and the ellipse eccentricity are obtained; the top view image is acquired through a second visual camera at the top, the outline of the inner ring multi-section independent arc section is extracted, the circle centers of all the arc sections are fitted, the deviation between the whole center of the inner ring and the concentricity is calculated, and double verification is carried out on the circle center of the outer ring and the eccentricity of the ellipse by utilizing the deviation between the whole center of the inner ring and the concentricity.

Inventors

Miao Boyu
ZHAO HONGTAO
Shu Xinhong
WU YULUN
Chen Xuanzuo
CHANG LIANG
SU ZHANHUA

Assignees

台州职业技术学院

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. The double-view-angle size detection method for the motor iron core of the automobile is characterized by comprising the following steps of: Vertically placing an iron core workpiece, acquiring a plurality of groups of outer ring width data by matching with the rotation of the iron core workpiece through a first visual camera on the side surface, and establishing an outer ring elliptical model to obtain the center of an outer ring and the elliptical eccentricity; Acquiring a overlooking image through a second visual camera at the top, extracting the outline of the inner ring multi-section independent arc segments, fitting the circle centers of all the arc segments and calculating the deviation between the whole center of the inner ring and the concentricity; And double verification is carried out on the circle center and the ellipse eccentricity of the outer ring by utilizing the deviation between the whole center and the concentricity of the inner ring.
2. The method for detecting the double-view size of the iron core of the motor of the automobile according to claim 1, wherein the outer ring elliptical model of the iron core workpiece is based on the rotation angle The method comprises the following steps of constructing an outer ring elliptical model of the iron core workpiece: wherein θ is the angle of rotation of the iron core workpiece, W (θ) is the width data collected by the angle of rotation θ of the iron core workpiece, a is the long half axis, b is the short half axis, and phi is the initial deflection angle of the major axis of the ellipse.
3. The method for detecting the double-view size of the iron core of the motor of the automobile according to claim 2, wherein the eccentricity e of the outer ring of the iron core workpiece is obtained according to a long half shaft a and a short half shaft b in an elliptical model of the outer ring of the iron core workpiece, and the eccentricity e is as follows: when e=0, the outer ring of the core work piece is a perfect circle, and a larger e indicates a flatter outer ring of the core work piece.
4. The method for detecting the double-view size of the iron core of the motor of the automobile according to claim 2, wherein in the process of rotationally collecting the iron core workpiece, four groups of width data are rotationally collected to form rotation angle and width data W (thetai), i epsilon {1,2,3, & gt, n }, n is more than or equal to 4; θ1=0°, θ2=α, θ3=2α, θ4=3α, α ranging from 50 ° to 80 °.
5. The method for detecting the double-view size of the motor core of the automobile according to claim 4, wherein any one of n groups of data is selected to form four groups of outer ring elliptical models, and values (ai, bi) of a long half shaft a and a short half shaft b of a group C (i, 3) are obtained; according to each group (ai, bi), the mean value and standard deviation of the long half shaft and the short half shaft are obtained, and the mean value is: the standard deviation is: and when the standard deviation of the long half shaft and the short half shaft is smaller than the threshold value, the detection data are effective, and the eccentricity e of the outer ring of the iron core workpiece is obtained according to the average value of the long half shaft and the short half shaft.
6. The method for detecting the double-view size of the motor core of the automobile according to claim 1, wherein the iron core workpiece comprises an inner ring, the inner ring comprises m sections of arc bodies which are independently distributed, and each arc body is fixedly connected with the inner periphery of the outer ring through a connecting rib respectively; Acquiring the positions Oj (Xj, yj) of the circle centers of the arc-shaped bodies relative to the center of the outer ring elliptical model; The inner ring overall center Oin (Xin, yin) is: Where j e {1,2,3,., m }, j represents the serial number of the arc bodies, and m represents the total number of the arc bodies.
7. The method for detecting the double-view size of an iron core of an automobile motor according to claim 6, wherein the inner ring concentricity deviation is obtained according to the center positions Oj (Xj, yj) of the arc bodies of each segment Deviation of center of excircle and integral center of inner ring ; The method comprises the following steps: The method comprises the following steps: When (when) Judging the outer ring and the outer ring when the threshold value is less than or equal to the centering of the inner ring is effective.
8. The method for detecting the double-view size of the motor core of the automobile according to claim 5 is characterized in that the correlation judgment is carried out according to the ellipticity of the outer ring and the concentricity of the inner ring, a double correlation coefficient T is obtained, the double verification of the outer ring and the inner ring is realized, and the correlation coefficient T is: Wherein, the For the purpose of the calibration coefficient, Is an association threshold; When the associated coefficient T When the deviation degree of the inner ring and the outer ring is in a uniform state, the deviation degree is shown.
9. The method for detecting the double-view size of the iron core of the motor of the automobile according to claim 1, wherein the height parameter of the iron core workpiece can be obtained through the first visual camera on the side face.
10. A system for detecting the double-view size of an automobile motor iron core, which is characterized in that the method for detecting the double-view size of the automobile motor iron core according to any one of claims 1-9 is adopted.

Description

Method and system for detecting double-view-angle size of motor core of automobile Technical Field The invention relates to a visual inspection technology of an iron core workpiece, in particular to a double-view-angle size inspection method of an automobile motor iron core, and also relates to a double-view-angle size inspection system of the automobile motor iron core. Background The automobile motor iron core is of an annular structure, is easy to be extruded by external force in the processing, clamping and conveying processes, and enables the excircle to be changed into an ellipse from a perfect circle, so that the assembly precision and the running performance of the motor are directly affected. The traditional detection mode is mostly single visual angle and single measurement, the change of the whole circumferential dimension cannot be represented, the elliptical deformation is difficult to accurately identify, meanwhile, the single visual detection is easily affected by factors such as illumination, edge noise, iron core workpiece eccentricity and the like, and a reliable internal feature verification mechanism is lacked. The motor core inner ring is usually formed by a plurality of sections of mutually independent arc bodies, and when the outer circle is flattened and deformed, the shape of each arc body is not changed, and only the circle center deviation, the concentricity variation and the circumferential uneven distribution occur. The prior art does not fully utilize the internal characteristics to carry out cross validation on the outer circle detection result, so that the detection precision, stability and reliability are difficult to meet the severe requirements of online full detection of the high-end motor core. Disclosure of Invention The invention aims to overcome the defects in the prior art and provides a method and a system for detecting the double-view size of an automobile motor iron core. In order to achieve the above purpose, the present invention adopts the following technical scheme: a double-view size detection method for an automobile motor iron core comprises the following steps: Vertically placing an iron core workpiece, acquiring a plurality of groups of outer ring width data by matching with the rotation of the iron core workpiece through a first visual camera on the side surface, and establishing an outer ring elliptical model to obtain the center of an outer ring and the elliptical eccentricity; Acquiring a overlooking image through a second visual camera at the top, extracting the outline of the inner ring multi-section independent arc segments, fitting the circle centers of all the arc segments and calculating the deviation between the whole center of the inner ring and the concentricity; And double verification is carried out on the circle center and the ellipse eccentricity of the outer ring by utilizing the deviation between the whole center and the concentricity of the inner ring. The invention further discloses an outer ring elliptical model of the iron core workpiece according to the rotation angleThe method comprises the following steps of constructing an outer ring elliptical model of the iron core workpiece: wherein θ is the angle of rotation of the iron core workpiece, W (θ) is the width data collected by the angle of rotation θ of the iron core workpiece, a is the long half axis, b is the short half axis, and phi is the initial deflection angle of the major axis of the ellipse. According to the invention, the eccentricity e of the outer ring of the iron core workpiece is obtained according to the long half shaft a and the short half shaft b in the outer ring elliptical model of the iron core workpiece, wherein the eccentricity e is as follows: when e=0, the outer ring of the core work piece is a perfect circle, and a larger e indicates a flatter outer ring of the core work piece. In the invention, in the process of rotating and collecting the iron core workpiece, four groups of width data are collected in a rotating way to form rotating angle and width data W (thetai), i epsilon {1,2,3, n }, and n is more than or equal to 4; θ1=0°, θ2=α, θ3=2α, θ4=3α, α ranging from 50 ° to 80 °. The invention further selects three groups in any one of n groups of data, and the combined data form four groups of outer ring elliptical models to obtain values (ai, bi) of a C (i, 3) group of long half shafts a and short half shafts b; according to each group (ai, bi), the mean value and standard deviation of the long half shaft and the short half shaft are obtained, and the mean value is: the standard deviation is: and when the standard deviation of the long half shaft and the short half shaft is smaller than the threshold value, the detection data are effective, and the eccentricity e of the outer ring of the iron core workpiece is obtained according to the average value of the long half shaft and the short half shaft. The iron core workpiece comprises an inner ring, wherein t