CN108508027B - Stator detection method and detection device - Google Patents
Stator detection method and detection device Download PDFInfo
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- CN108508027B CN108508027B CN201810347745.3A CN201810347745A CN108508027B CN 108508027 B CN108508027 B CN 108508027B CN 201810347745 A CN201810347745 A CN 201810347745A CN 108508027 B CN108508027 B CN 108508027B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
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Abstract
The invention relates to a stator detection method and a detection device, wherein the method comprises the following steps: acquiring a measured sub-image; converting the stator image into a gray image; acquiring a detection area according to the stator image converted into the gray level image; the gray value of the detection area is obtained and compared with a preset qualified parameter range, so that whether a measured object is qualified or not is judged, and finally a judging result is output, wherein the conveying mechanism is responsible for feeding through the cooperative work of the conveying mechanism, the photographing mechanism and the image processor, the photographing mechanism converts the measured stator enameled wire into an image signal through a camera and transmits the image signal to the image processor, and the qualified or unqualified result is output through image comparison processing, so that abnormal sound is avoided after the motor is assembled, poor motor performance occurs, and the yield of a motor finished product is improved.
Description
Technical Field
The invention relates to the field of motors, in particular to a stator detection method and a stator detection device.
Background
An electric machine, commonly called a "motor", refers to an electromagnetic device that converts or transmits electrical energy according to the law of electromagnetic induction. The motor is generally composed of a stator, a rotor, and front and rear covers, wherein the stator is provided with an annular iron core, and a coil winding is wound on the iron core, and a wire adopted by the coil winding is generally an enameled wire.
In order to ensure the yield of the motor, detection or correction is usually required to be performed by the stator, the rotor and the front cover and the rear cover respectively before electronic assembly, and for the stator, whether the inner ring and the outer ring of the enameled wire winding are regular or not, such as redundant paper scraps, irregular copper wires, binding belts, cotton wires and the like, is required.
However, at present, manual detection is mainly adopted, so that the efficiency is low, the error rate is high, and the automation and the intellectualization are not enough.
Disclosure of Invention
In order to solve the defects and shortcomings of the prior art, the invention provides a stator detection method and a stator detection device, which realize the automation of stator detection by acquiring the front and back images of a measured object and analyzing and processing the front and back images by an image processor to obtain whether a stator is qualified or not.
Based on this, a first object of the present invention is to provide a stator detection method, which is applied to a stator detection device, wherein the stator detection device includes a stator conveying mechanism, a photographing mechanism and an image processor; the stator conveying mechanism comprises at least one stator accommodating part, wherein the accommodating part is provided with a longitudinal through hole, and the diameter of the longitudinal through hole is larger than the outer diameter of the stator coil winding; the photographing mechanism comprises a top surface photographing assembly and a bottom surface photographing assembly, wherein the top surface photographing assembly and the bottom surface photographing assembly both comprise a camera which is respectively arranged above and below the accommodating part; the two cameras are respectively and electrically connected with the input end of the image processor; the top surface photographing assembly and the bottom surface photographing assembly comprise an annular light source and a backlight source, the annular light source is arranged between the stator accommodating part and each camera, and the backlight source is arranged on the opposite side of the annular light source relative to the accommodating part; the method comprises the following steps:
acquiring a measured sub-image;
converting the stator image into a gray scale image;
acquiring a detection area according to the stator image converted into the gray level image; reading a preset detection template, and selecting an inner ring of a stator coil winding in a stator image according to the detection template to form a first detection area;
reading a preset detection template, and selecting an outer ring of a stator coil winding in the stator image according to the detection template to form a second detection area;
and acquiring the gray value of the detection area, comparing the gray value with a preset qualified parameter range, judging that the detected stator is qualified if the gray value of the detected stator is within the qualified parameter range, judging that the detected stator is unqualified if the detected stator is not within the qualified parameter range, and finally outputting a judging result.
As a further improvement of the above-described stator detecting method, the step acquires a measured sub-image in which front and back images of the measured stator are acquired.
As a further improvement of the above-described stator detecting method,
before converting the stator image into a gray scale image, the steps include:
the contrast of the stator image is enhanced.
As a further improvement of the above stator detection method, before the step of acquiring the measured sub-image, the method further includes the steps of: the measured object is conveyed to a station for acquiring images.
And calling a preset qualified parameter range, acquiring a parameter value of a detection area, comparing the parameter value with the preset qualified parameter range, judging whether a measured object is qualified or not, and finally outputting a judging result, wherein the preset qualified parameter is the gray value.
As a further improvement of the above stator detecting method, the step of acquiring the sub-image to be measured and the step of conveying the sub-image to be measured to a station for acquiring the image further include the steps of: detecting whether the station for acquiring the image has material, if so, acquiring the stator image, and if not, continuing to detect.
In order to achieve the second object of the present invention, the present invention also provides a stator detection device, including a stator conveying mechanism, a photographing mechanism and an image processor; the stator conveying mechanism comprises at least one stator accommodating part, wherein the accommodating part is provided with a longitudinal through hole, and the diameter of the longitudinal through hole is larger than the outer diameter of the stator coil winding; the photographing mechanism comprises a top surface photographing assembly and a bottom surface photographing assembly, wherein the top surface photographing assembly and the bottom surface photographing assembly both comprise a camera which is respectively arranged above and below the accommodating part; the two cameras are respectively and electrically connected with the input end of the image processor.
As a further improvement of the above stator detecting device, the top-face photographing assembly and the bottom-face photographing assembly each include an annular light source and a backlight source, the annular light source is disposed between the stator accommodating portion and each camera, and the backlight source is disposed on an opposite side of the annular light source with respect to the accommodating portion.
As a further improvement of the stator detection device, the device further comprises a shading component, wherein the shading component is covered outside the photographing mechanism and comprises a frame and a shading plate, and the shading plate is paved on the frame.
As a further improvement of the above stator detecting device, the stator conveying mechanism further includes a photoelectric detecting head provided at a photographing station of each camera.
Compared with the prior art, the stator detection method provided by the invention has the advantages that whether the inner ring and the outer ring of the stator enameled wire coil winding are regular or not is detected rapidly through a series of steps, so that unqualified stators are screened before motor assembly, abnormal sound is avoided after motor assembly, poor motor performance is avoided, and the yield of motor finished products is improved. The detection device of the stator enamelled wire detector is in charge of feeding through the cooperation of the conveying mechanism, the photographing mechanism and the image processor, the photographing mechanism converts the detected stator enamelled wire into an image signal through the camera and transmits the image signal to the image processor, and the qualified or unqualified result is output through image contrast processing, so that the labor cost and the workload are greatly reduced, the objectivity is high, the stator enamelled wire detection automation is realized, the operation is convenient, and the efficiency is high.
For a better understanding and implementation, the present invention is described in detail below with reference to the drawings.
Drawings
FIG. 1 is a flow chart of a stator detection method according to the present invention;
FIG. 2 is a stator view of the present invention when an inner ring is selected as a detection area;
FIG. 3 is a stator view of the present invention when the outer race is selected as the detection region;
FIG. 4 is a perspective view of a stator detecting device according to the present invention;
FIG. 5 is a side view of a stator detection apparatus according to the present invention;
fig. 6 is a top view of the stator detecting device according to the present invention.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are intended to convey the scope of the invention to those skilled in the art.
Unless otherwise defined, terms (including technical and scientific terms) used herein should be understood to have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Moreover, it will be appreciated that the terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
As shown in fig. 1, fig. 1 is a flowchart of a stator detection method according to the present invention. A stator detection method, suitable for a detection device of a motor stator, comprising the following steps:
s1: conveying the measured object to a station for acquiring stator images;
s2: detecting whether the station for acquiring the stator image has material or not, if so, acquiring the stator image, and if not, continuing to detect;
s3: acquiring a measured sub-image;
s4: enhancing contrast of stator images
S5: converting the stator image into a gray scale image;
s6: acquiring a detection area according to the stator image converted into the gray level image;
s7: and acquiring the gray value of the detection area, comparing the gray value with a preset qualified parameter range, judging that the detected stator is qualified if the gray value of the detected stator is within the qualified parameter range, judging that the detected stator is unqualified if the detected stator is not within the qualified parameter range, and finally outputting a judging result.
Specifically, in this embodiment, in order to ensure the comprehensiveness and efficiency of the detection, in the step S3, the front and back images of the measured object are acquired. The detection method mainly detects whether the stator enameled wire is regular or not, and whether the stator enameled wire is provided with redundant paper scraps, irregular copper wires, binding belts, cotton wires and the like, so that the front side and the back side of the stator are possibly unqualified, and the front side and the back side of the stator are required to be subjected to image acquisition.
In this embodiment, the step S4: the contrast ratio of the stator image is enhanced, the color of the stator enamelled coil can be restored, the detection area and the existence of foreign matters can be identified more easily in the detection process, and the detection efficiency and accuracy are improved.
As shown in fig. 2 and 3, fig. 2 is a stator diagram of the present invention when an inner ring is selected as a detection area; fig. 3 is a stator diagram of the present invention when the outer ring is selected as the detection area.
The step S6 includes the following steps:
reading a preset detection template, and selecting an inner ring of a stator coil winding in a stator image according to the detection template to form a first detection area A;
and reading a preset detection template, and selecting the outer ring of the stator coil winding in the stator image according to the detection template to form a second detection area B.
The detection template is an area with preset coordinates, shape and size, and after the stator image is acquired, the preset detection template is sleeved on the detected stator image, and the detection area is automatically captured and positioned. In this embodiment, the first detection area a and the second detection area B are respectively an inner ring and an outer ring of the stator coil winding, so as to detect whether the inner ring and the outer ring are regular.
In this embodiment, in step S7, whether the stator is qualified is determined by extracting whether the gray value of the detection area is within a preset qualified parameter range, thereby determining whether the inner ring and the outer ring of the measured sub-coil winding are regular and foreign objects exist, wherein if the foreign objects appear, the foreign objects can be determined by the gray value because there is a large difference between the gray value of the stator coil winding and the gray value of the foreign objects.
According to the stator detection method, whether the inner ring and the outer ring of the coil winding of the stator enameled wire are regular or not is detected rapidly through the series of steps, so that unqualified stators are screened before the motor is assembled, abnormal sound is avoided after the motor is assembled, poor motor performance is avoided, and the yield of motor finished products is improved.
Accordingly, as shown in fig. 4 to 6, fig. 4 is a perspective view of the enamel wire detecting device according to the present invention; fig. 5 is a side view of the enamel wire detecting device according to the present invention; fig. 6 is a top view of the enamel wire detecting device of the present invention. The invention also provides a stator detection device corresponding to the stator detection method, which comprises a stator conveying mechanism, a photographing mechanism and an image processor;
the stator conveying mechanism is used for conveying the measured object to a station for acquiring an image;
the photographing mechanism is used for acquiring an image of the measured object;
the image processor is used for executing the following steps:
s4: enhancing contrast of stator images
S5: converting the stator image into a gray scale image; s6: acquiring a detection area of an image;
s7: and acquiring the gray value of the detection area, comparing the gray value with a preset qualified parameter range, judging that the detected stator is qualified if the gray value of the detected stator is within the qualified parameter range, judging that the detected stator is unqualified if the detected stator is not within the qualified parameter range, and finally outputting a judging result.
The stator conveying mechanism comprises at least one stator accommodating part, wherein the accommodating part is provided with a longitudinal through hole, and the diameter of the longitudinal through hole is larger than the outer diameter of the stator coil winding; the photographing mechanism comprises a top surface photographing assembly 3a and a bottom surface photographing assembly 3b, wherein the top surface photographing assembly 3a and the bottom surface photographing assembly 3b comprise a camera which is respectively arranged above and below the accommodating part; the two cameras are respectively and electrically connected with the input end of the image processor. The stator is arranged at the accommodating part of the conveying mechanism, when the accommodating part reaches the photographing station of the photographing mechanism, the photographing mechanism photographs, images of the front and the back of the measured object are obtained and input into the image processor, the image processor converts the images into digital signals according to information such as pixel distribution, brightness, color and the like, and various operations are carried out on the signals to extract the characteristics of the object, so that whether the measured object is qualified or not is obtained.
Specifically, the device comprises a frame 1, wherein the stator conveying mechanism and the photographing mechanism are both arranged on the frame 1.
The stator conveying mechanism comprises a stator conveying belt 21 and a driving mechanism 22, at least one stator accommodating part is arranged on the stator conveying belt 21, the stator conveying belt 21 is in driving connection with the driving mechanism 22, in the embodiment, the driving mechanism 22 is a servo motor, is in driving connection with the stator conveying belt, and drives the stator conveying belt 21 to circularly rotate.
The stator conveying mechanism further comprises photoelectric detection heads, the photoelectric detection heads are arranged at the photographing stations of the cameras, the photoelectric detection heads detect whether the photographing stations have stators, if so, the stator conveying belt 21 stops rotating, the photographing mechanism starts working, and if not, the stator conveying belt 21 continues rotating.
The top photographing assembly 3a comprises a camera 31a, an annular light source 32a, a backlight source 33a and a support 34a, the camera 31a, the annular light source 32a and the backlight source 33a are all installed on the support 34a, the support 34a is installed on the frame, the bottom photographing assembly 3b comprises a camera 31b, an annular light source 32b, a backlight source 33b and a support 34b, the camera 31b, the annular light source 32b and the backlight source 33ba are all installed on the support 34b, and the support 34b is installed on the frame. Wherein, the annular light source is red light source, set up between stator holding portion with each camera, the backlight sets up the opposite side of annular light source relative holding portion, it is noted that top surface subassembly 3a and bottom surface subassembly 3b of shooing stagger the setting to the installation direction is opposite.
The invention also comprises a shading component which is covered outside the photographing mechanism, in the embodiment, the shading component is a cabinet body and comprises a frame 41 and a shading plate 42, the shading plate 42 is paved on the frame 41, the shading plate 42 can be a brown glass plate, and a movable door 43 is preferably arranged for operating the total components of the shading component.
In addition, the device also comprises a display 5, wherein the display 5 is electrically connected with the output end of the image processor and is arranged on the frame 41, so that an operator can conveniently control the whole detection device. The invention also comprises an alarm lamp (not shown), wherein the alarm lamp is electrically connected with the output end of the image processor, and when the image processor obtains an unqualified signal, an instruction is output to the alarm lamp to be started, so that an operator is informed to take out the unqualified stator.
Working principle: the detection device is mainly used for detecting whether the stator enameled wires are regular, such as redundant paper scraps, irregular copper wires, binding belts, cotton wires and the like, and the working process is that the stator is arranged in the accommodating part of the stator conveyor belt 21, when the accommodating part reaches the photographing station of the photographing mechanism, the photoelectric detection head 23 detects the stator, the stator conveyor belt 21 stops rotating, the photographing mechanism photographs, the images of the front face and the aspects of a detected sub-image are obtained and input into the image processor, the image processor obtains the detection area and the gray value of the detected sub-image according to a pre-stored detection template and a qualified detection parameter range, the result of whether the detected sub-image is qualified or not is obtained through comparison, a plurality of detection results are unqualified, and the alarm lamp can be lightened.
Compared with the prior art, the enameled wire detection device disclosed by the invention has the advantages that the conveying mechanism, the photographing mechanism and the image processor work cooperatively, the conveying mechanism is responsible for feeding, the photographing mechanism converts the detected stator enameled wire into an image signal through the camera and transmits the image signal to the image processor, and the qualified or unqualified result is output through image contrast processing, so that the stator enameled wire detection automation is realized, the operation is convenient, the efficiency is high, the annular light source and the backlight source are adopted for illumination, and the influence of external natural light and a background interface is effectively solved by adopting the cooperation of the shading component.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (7)
1. A stator detection method is characterized in that: the device is applied to a stator detection device, and comprises a stator conveying mechanism, a photographing mechanism and an image processor; the stator conveying mechanism comprises at least one stator accommodating part, wherein the accommodating part is provided with a longitudinal through hole, and the diameter of the longitudinal through hole is larger than the outer diameter of the stator coil winding; the photographing mechanism comprises a top surface photographing assembly and a bottom surface photographing assembly, wherein the top surface photographing assembly and the bottom surface photographing assembly both comprise a camera which is respectively arranged above and below the accommodating part; the two cameras are respectively and electrically connected with the input end of the image processor; the top surface photographing assembly and the bottom surface photographing assembly comprise an annular light source and a backlight source, the annular light source is arranged between the stator accommodating part and each camera, and the backlight source is arranged on the opposite side of the annular light source relative to the accommodating part;
the method comprises the following steps:
acquiring a measured sub-image;
converting the stator image into a gray scale image;
acquiring a detection area according to the stator image converted into the gray level image; reading a preset detection template, and selecting an inner ring of a stator coil winding in a stator image according to the detection template to form a first detection area;
reading a preset detection template, and selecting an outer ring of a stator coil winding in the stator image according to the detection template to form a second detection area;
and acquiring the gray value of the detection area, comparing the gray value with a preset qualified parameter range, judging that the detected stator is qualified if the gray value of the detected stator is within the qualified parameter range, judging that the detected stator is unqualified if the detected stator is not within the qualified parameter range, and finally outputting a judging result.
2. The stator detection method according to claim 1, characterized in that: the step acquires a measured sub-image, wherein front and back images of the measured sub-image are acquired.
3. The stator detection method according to claim 1, characterized in that: before converting the stator image into a gray scale image, the steps include:
the contrast of the stator image is enhanced.
4. The stator detection method according to claim 1, characterized in that: before the step of acquiring the measured sub-image, the method further comprises the steps of: the measured object is conveyed to a station for acquiring images.
5. The stator detection method according to claim 4, wherein: the step of acquiring the measured sub-image and the step of conveying the measured sub-image to a station for acquiring the image further comprises the steps of: detecting whether the station for acquiring the image has material, if so, acquiring the stator image, and if not, continuing to detect.
6. The stator detection method according to claim 1, characterized in that: the camera shooting device further comprises a shading component, wherein the shading component is covered outside the shooting mechanism and comprises a frame and a shading plate, and the shading plate is paved on the frame.
7. The stator detection method according to claim 1, characterized in that: the stator conveying mechanism further comprises photoelectric detection heads, and the photoelectric detection heads are arranged at photographing stations of the cameras.
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| CN110118786B (en) * | 2019-05-07 | 2022-05-17 | 鲁班嫡系机器人（深圳）有限公司 | Detection method, detection device and industrial equipment |
| CN113720857A (en) * | 2021-09-30 | 2021-11-30 | 格兰德电气有限公司 | Method for automatically comparing stator defects |
| CN115737102B (en) * | 2023-01-10 | 2023-04-25 | 杭州糖吉医疗科技有限公司 | Laser cutting assembly type gastric diversion stent and preparation method thereof |
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