Presence Identification System for Brushless DC Motors

Abstract

The present invention relates to a brushless DC motor existence identification system, comprising: an operation analysis device, used for issuing a first control command when analyzing that the brushless DC motor is currently in working mode and the speed data is decreasing, otherwise, issuing a second control command; a directional analysis device, used for issuing a device analysis instruction when the contour of a certain reference image block in the equalization processing image matches the reference contour of the phase loss protection device. Through the present invention, only when analyzing that the brushless DC motor is currently in working mode and the speed is decreasing, the subsequent intelligent processing of the existence identification of the phase loss protection device is started as a suspected phase loss scene, and when the contour of a certain reference image block in the equalization processing image matches the reference contour of the phase loss protection device, it is judged that the brushless DC motor working site has a phase loss protection device, thereby taking into account both the identification accuracy and the power consumption saving.

Description

Technical Field

[0001] The invention relates to the field of brushless DC motors, and in particular to an existence identification system for brushless DC motors. Background Art

[0002] The brushless DC motor consists of a motor body and a driver, and is a typical mechatronics product. A brushless motor is a motor without brushes and a commutator (or collector ring), also known as a commutatorless motor. As early as the birth of the motor, the practical motor produced was a brushless form, that is, an AC squirrel cage asynchronous motor, which has been widely used. However, asynchronous motors have many insurmountable defects, and the development of motor technology has been slow. Subsequently, transistors were born, and DC brushless motors that use transistor commutation circuits instead of brushes and commutators came into being. This new type of brushless motor is called an electronically commutated DC motor.

[0003] The brushless DC motor in the prior art lacks a high-precision identification mechanism for the existence of phase loss protection devices, and the only rough identification mechanism is a continuous and uninterrupted identification mode. Obviously, the former may have detection errors, and the latter wastes too much system energy, and both cannot meet the current detection needs for the existence of phase loss protection devices. Summary of the invention

[0004] In order to solve the technical problems in related fields, the present invention provides a brushless DC motor existence identification system. Only when it is analyzed that the brushless DC motor is currently in working mode and the speed is decreasing, the subsequent intelligent processing of the existence identification of the phase loss protection device is started as a suspected phase loss scenario, thereby avoiding wasting excessive system energy consumption. More importantly, when the contour of a reference image block in the equalization processing image matches the baseline contour of the phase loss protection device, it is judged that there is a phase loss protection device at the working site of the brushless DC motor; otherwise, it is judged that the phase loss protection device is missing at the working site of the brushless DC motor, thereby improving the identification accuracy of the missing phase loss protection device at the working site of the brushless DC motor.

[0005] According to the present invention, there is provided a brushless DC motor existence identification system, the system comprising:

[0006] An operation analysis device is connected to the brushless DC motor, and is used to issue a first control command when analyzing that the brushless DC motor is currently in a working mode and the speed data decreases, and to issue a second control command when analyzing that the brushless DC motor is currently in a sleep mode or is currently in a working mode and the speed data does not decrease;

[0007] A monitoring and capturing device, connected to the operation analysis device, for performing monitoring and capturing processing on the working environment of the brushless DC motor upon receiving the first control command, so as to obtain and output a corresponding working environment picture;

[0008] A signal enhancement device, connected to the monitoring capture device, is used to perform image content enhancement processing based on logarithmic transformation on the received working environment picture to obtain and output a corresponding signal enhanced image;

[0009] A filtering operation device, connected to the signal enhancement device, for performing arithmetic mean filtering on the received signal enhancement image to obtain and output a corresponding arithmetic mean filtered image;

[0010] an equalization processing device, connected to the filtering operation device, for performing a histogram equalization process based on a distribution function on the received arithmetic mean filtering image to obtain and output a corresponding equalization processed image;

[0011] a directional analysis device, connected to the equalization processing device, for obtaining the brightness values ​​corresponding to the pixels in the received equalization processing image, taking each pixel in the equalization processing image as a central pixel, determining the brightness value gradient of the central pixel based on the brightness values ​​of the central pixel and the pixels around it, and judging the central pixel as an edge pixel when the brightness value gradient of the central pixel exceeds a limit, so as to obtain the edge pixels in the equalization processing image, taking the image blocks surrounded by the edge pixels in the equalization processing image as the reference image blocks, and issuing a device analysis instruction when the contour of a reference image block in the equalization processing image matches the reference contour of the phase loss protection device;

[0012] The directional resolution device is further used to issue a device unresolved instruction when the contours of each reference image block in the equalization processing image do not match the reference contour of the phase failure protection device.

[0013] It can be seen that the present invention has at least the following four main inventive concepts:

[0014] Firstly, the working environment picture corresponding to the working site of the brushless DC motor is subjected to a multi-layer optimization process of image content enhancement based on logarithmic transformation, arithmetic mean filtering and histogram equalization based on distribution function in sequence, so as to obtain a corresponding equalized processed image as an image quality improvement image for subsequent existence identification of the phase loss protection device;

[0015] Secondly: obtaining the brightness values ​​corresponding to the pixels in the equalized image, taking each pixel in the equalized image as the central pixel, determining the brightness gradient of the central pixel based on the brightness values ​​of the central pixel and the pixels around it, and judging the central pixel as an edge pixel when the brightness gradient of the central pixel exceeds a limit, so as to obtain the edge pixels in the equalized image, and taking the image blocks surrounded by the edge pixels in the equalized image as the reference image blocks;

[0016] Again: when the contour of a certain reference image block in the equalization processing image matches the reference contour of the phase-loss protection device, it is determined that there is a phase-loss protection device at the working site of the brushless DC motor; otherwise, it is determined that the phase-loss protection device is missing at the working site of the brushless DC motor;

[0017] Finally: Only when analyzing that the brushless DC motor is currently in working mode and the speed is decreasing, the subsequent intelligent processing of the existence identification of the phase loss protection device is initiated as a suspected phase loss scenario, thereby avoiding wasting excessive system energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The embodiments of the present invention will be described below with reference to the accompanying drawings, wherein:

[0019] Figure 1 It is a structural block diagram of a brushless DC motor existence identification system according to a primary embodiment of the present invention.

[0020] Figure 2 It is a structural block diagram of a brushless DC motor existence identification system according to a secondary embodiment of the present invention.

[0021] Figure 3 FIG. 1 is a structural block diagram of a system for identifying the existence of a brushless DC motor according to another embodiment of the present invention. DETAILED DESCRIPTION

[0022] The embodiment of the brushless DC motor existence identification system of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Figure 1 The structural block diagram of the brushless DC motor existence identification system according to the primary embodiment of the present invention is shown, and the system includes:

[0024] An operation analysis device is connected to the brushless DC motor, and is used to issue a first control command when analyzing that the brushless DC motor is currently in a working mode and the speed data decreases, and to issue a second control command when analyzing that the brushless DC motor is currently in a sleep mode or is currently in a working mode and the speed data does not decrease;

[0025] Specifically, the operation analysis device is connected to the brushless DC motor, and is used to issue a first control command when analyzing that the brushless DC motor is currently in the working mode and the speed data is reduced, and issue a second control command when analyzing that the brushless DC motor is currently in the sleep mode or is currently in the working mode and the speed data is not reduced. The operation analysis device can be implemented by using a PLC chip, and is connected to the brushless DC motor, and is used to issue a first control command when analyzing that the brushless DC motor is currently in the working mode and the speed data is reduced, and issue a second control command when analyzing that the brushless DC motor is currently in the sleep mode or is currently in the working mode and the speed data is not reduced;

[0026] A monitoring and capturing device, connected to the operation analysis device, for performing monitoring and capturing processing on the working environment of the brushless DC motor upon receiving the first control command, so as to obtain and output a corresponding working environment picture;

[0027] A signal enhancement device, connected to the monitoring capture device, is used to perform image content enhancement processing based on logarithmic transformation on the received working environment picture to obtain and output a corresponding signal enhanced image;

[0028] A filtering operation device, connected to the signal enhancement device, for performing arithmetic mean filtering on the received signal enhancement image to obtain and output a corresponding arithmetic mean filtered image;

[0029] an equalization processing device, connected to the filtering operation device, for performing a histogram equalization process based on a distribution function on the received arithmetic mean filtering image to obtain and output a corresponding equalization processed image;

[0030] a directional analysis device, connected to the equalization processing device, for obtaining the brightness values ​​corresponding to the pixels in the received equalization processing image, taking each pixel in the equalization processing image as a central pixel, determining the brightness value gradient of the central pixel based on the brightness values ​​of the central pixel and the pixels around it, and judging the central pixel as an edge pixel when the brightness value gradient of the central pixel exceeds a limit, so as to obtain the edge pixels in the equalization processing image, taking the image blocks surrounded by the edge pixels in the equalization processing image as the reference image blocks, and issuing a device analysis instruction when the contour of a reference image block in the equalization processing image matches the reference contour of the phase loss protection device;

[0031] The directional resolution device is further used to issue a device unresolved instruction when the contours of each reference image block in the equalization processing image do not match the reference contour of the phase failure protection device;

[0032] The monitoring and capturing device is further used to temporarily suspend the monitoring and capturing processing of the working environment of the brushless DC motor when receiving the second control command;

[0033] Among them, each image block enclosed by the each edge pixel point in the equalization processing image is used as each reference image block. When there is a reference image block in the equalization processing image whose contour matches the reference contour of the phase loss protection device, issuing a device analysis instruction includes: the reference contour of the phase loss protection device is represented by the reference contour pattern corresponding to the phase loss protection device.

[0034] Figure 2 It is a structural block diagram of a brushless DC motor existence identification system according to a secondary embodiment of the present invention.

[0035] Compared to Figure 1 , Figure 2 The brushless DC motor presence identification system may also include:

[0036] a width sensor, connected to the signal enhancement device, the filtering operation device, the equalization processing device and the directional analysis device, respectively, and used to measure the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional analysis device respectively;

[0037] Wherein, the width sensor device is respectively connected to the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device, and is used to respectively measure the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device, including: the width sensor device includes a plurality of width measurement units, which are respectively connected to the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device, so as to complete the measurement of the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device;

[0038] Wherein, the width sensor device includes a plurality of width measurement units, which are used to be respectively connected to the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device to complete the respective measurement of the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device, including: the plurality of width measurement units are a plurality of width sensors, which are used to be respectively connected to the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device to complete the respective measurement of the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device;

[0039] The plurality of width measurement units are a plurality of width sensors, which are respectively connected to the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device to respectively measure the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device, including: the plurality of width sensors have the same structure;

[0040] Among them, the multiple width measurement units are multiple width sensors, which are used to connect to the signal enhancement device, the filtering operation device, the equalization processing device and the directional analysis device respectively, so as to complete the respective measurements of the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional analysis device, and also include: the multiple width sensors have the same width measurement upper limit value and width measurement lower limit value.

[0041] Figure 3 FIG. 1 is a structural block diagram of a system for identifying the existence of a brushless DC motor according to another embodiment of the present invention.

[0042] Compared to Figure 1 , Figure 3 The brushless DC motor presence identification system may also include:

[0043] A width display mechanism, connected to the plurality of width measurement units of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device, respectively, for synchronously displaying the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device respectively;

[0044] Wherein, the width display mechanism is respectively connected to the plurality of width measurement units of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device, and is used to synchronously display the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device respectively, including: the width display mechanism is an LED display array;

[0045] Among them, the width display mechanism is respectively connected to multiple width measurement units of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device, and is used to synchronously display the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device, including: the width display mechanism is an LCD display array.

[0046] In addition, in the existence identification system of the brushless DC motor, the image blocks enclosed by the edge pixels in the equalization processing image are used as reference image blocks. When the contour of a reference image block in the equalization processing image matches the reference contour of the phase loss protection device, a device analysis instruction is issued, including: there is more than one frame of the reference contour pattern corresponding to the phase loss protection device, which are multiple frames of imaging pictures of the phase loss protection device in the factory state taken from different angles and only include the phase loss protection device in the factory state.

[0047] The brushless DC motor existence identification system of the present invention addresses the technical problems in the prior art of whether there is a phase loss protection device at the working site of the brushless DC motor, such as insufficient detection mechanism accuracy or huge power consumption. By only analyzing that the brushless DC motor is currently in working mode and the speed is reduced, the subsequent intelligent processing of the existence identification of the phase loss protection device is initiated as a suspected phase loss scenario, and when the contour of a reference image block in the equalization processing image matches the baseline contour of the phase loss protection device, it is judged that there is a phase loss protection device at the working site of the brushless DC motor, thereby taking into account both identification accuracy and power saving.

[0048] It will be appreciated by those skilled in the art that further variations are possible within the scope of the invention, which is defined in the appended claims.

Claims

1. A brushless DC motor existence identification system, characterized in that: The system comprises: An operation analysis device is connected to the brushless DC motor, and is used to issue a first control command when analyzing that the brushless DC motor is currently in a working mode and the speed data decreases, and to issue a second control command when analyzing that the brushless DC motor is currently in a sleep mode or is currently in a working mode and the speed data does not decrease; A monitoring and capturing device, connected to the operation analysis device, for performing monitoring and capturing processing on the working environment of the brushless DC motor upon receiving the first control command, so as to obtain and output a corresponding working environment picture; A signal enhancement device, connected to the monitoring capture device, is used to perform image content enhancement processing based on logarithmic transformation on the received working environment picture to obtain and output a corresponding signal enhanced image; A filtering operation device, connected to the signal enhancement device, for performing arithmetic mean filtering on the received signal enhancement image to obtain and output a corresponding arithmetic mean filtered image; an equalization processing device, connected to the filtering operation device, for performing a histogram equalization process based on a distribution function on the received arithmetic mean filtering image to obtain and output a corresponding equalization processed image; a directional analysis device, connected to the equalization processing device, for obtaining the brightness values ​​corresponding to the pixels in the received equalization processing image, taking each pixel in the equalization processing image as a central pixel, determining the brightness value gradient of the central pixel based on the brightness values ​​of the central pixel and the pixels around it, and judging the central pixel as an edge pixel when the brightness value gradient of the central pixel exceeds a limit, so as to obtain the edge pixels in the equalization processing image, taking the image blocks surrounded by the edge pixels in the equalization processing image as the reference image blocks, and issuing a device analysis instruction when the contour of a reference image block in the equalization processing image matches the reference contour of the phase loss protection device; The directional resolution device is further used to issue a device unresolved instruction when the contours of each reference image block in the equalization processing image do not match the reference contour of the phase failure protection device; The monitoring and capturing device is also used to temporarily suspend the monitoring and capturing processing of the working environment of the brushless DC motor when receiving the second control command; Among them, each image block enclosed by each edge pixel point in the equalization processing image is used as each reference image block. When there is a contour of a reference image block in the equalization processing image that matches the reference contour of the phase loss protection device, issuing a device parsing instruction includes: the reference contour of the phase loss protection device is represented by a reference contour pattern corresponding to the phase loss protection device, and the reference contour pattern corresponding to the phase loss protection device is more than one frame, which are multiple frames of imaging pictures of the phase loss protection device in the factory state taken from different angles and only include the phase loss protection device in the factory state.

2. The brushless DC motor existence identification system according to claim 1, characterized in that: The system further comprises: a width sensor, connected to the signal enhancement device, the filtering operation device, the equalization processing device and the directional analysis device, respectively, and used to measure the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional analysis device respectively; Among them, the width sensor device is respectively connected to the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device, and is used to respectively measure the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device. The width sensor device includes multiple width measurement units, which are respectively connected to the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device to complete the respective measurements of the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device.

3. The brushless DC motor existence identification system according to claim 2, characterized in that: The width sensor device includes multiple width measurement units, which are used to be respectively connected to the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device to complete the respective measurement of the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device. The multiple width measurement units are multiple width sensors, which are used to be respectively connected to the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device to complete the respective measurement of the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device.

4. The brushless DC motor existence identification system according to claim 3, characterized in that: The multiple width measurement units are multiple width sensors, which are used to be connected to the signal enhancement device, the filtering operation device, the equalization processing device and the directional analysis device respectively, so as to complete the respective measurements of the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional analysis device, including: the structures of the multiple width sensors are the same.

5. The brushless DC motor existence identification system according to claim 4, characterized in that: The multiple width measurement units are multiple width sensors, which are used to be connected to the signal enhancement device, the filtering operation device, the equalization processing device and the directional analysis device respectively, so as to complete the respective measurements of the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional analysis device, and also include: the multiple width sensors have the same width measurement upper limit value and width measurement lower limit value.

6. The brushless DC motor existence identification system according to any one of claims 2 to 5, characterized in that: The system further comprises: The width display mechanism is respectively connected to multiple width measurement units of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device, and is used to synchronously display the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device.

7. The brushless DC motor existence identification system according to claim 6, characterized in that: The width display mechanism is respectively connected to multiple width measurement units of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device, and is used to synchronously display the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device. The width display mechanism is an LED display array.

8. The brushless DC motor existence identification system according to claim 6, characterized in that: The width display mechanism is respectively connected to multiple width measurement units of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device, and is used to synchronously display the current real-time width values ​​of the signal enhancement device, the filtering operation device, the equalization processing device and the directional resolution device. The width display mechanism is an LCD display array.

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