CN113267689A - Wireless electric energy transmission power, magnetism, heat and temperature rise test system and test method - Google Patents
Wireless electric energy transmission power, magnetism, heat and temperature rise test system and test method Download PDFInfo
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Abstract
本发明属于无线电能测试技术领域，公开了一种无线电能传输电、磁、热及温升测试系统、测试方法、介质，包括：初始化模块进行系统初始化；导轨运动控制模块进行带动磁场探头准确定位，并对空间各点的指定位置的测量数据采集；通过控制步进电机进行可控的自动运动；磁场测量模块进行不同点电场、磁场值的自动测量；数据处理模块，用于对数据进行处理，进行磁场合成，通过插值算法绘制平滑三维曲面图。本发明通过热电偶温度传感器测量收发线圈上特征位置处线圈温度变化情况，采用红外热成像仪监测无线电能传输区域的热量变化情况。在此基础上实现了无线电能传输系统中三维磁场可视化以及热量温度可视化以及磁场与温度场变化。
The invention belongs to the technical field of wireless power testing, and discloses a wireless power transmission electrical, magnetic, thermal and temperature rise testing system, testing method and medium, comprising: an initialization module for system initialization; a guide rail motion control module for driving a magnetic field probe to accurately position , and collect the measurement data of the designated position of each point in space; control the stepper motor for controllable automatic movement; the magnetic field measurement module automatically measures the electric field and magnetic field values at different points; the data processing module is used to process the data , perform magnetic field synthesis, and draw a smooth three-dimensional surface graph through interpolation algorithm. In the invention, the temperature change of the coil at the characteristic position on the transceiver coil is measured by a thermocouple temperature sensor, and the heat change of the wireless power transmission area is monitored by an infrared thermal imager. On this basis, the visualization of the three-dimensional magnetic field, the visualization of the heat temperature and the changes of the magnetic field and the temperature field in the wireless power transfer system are realized.
Description
Technical Field
The invention belongs to the technical field of wireless electric energy testing, and particularly relates to a wireless electric energy transmission power, magnetism, heat and temperature rise testing system and method.
Background
At present, with the continuous development of scientific technology, after magnetic coupling resonant Wireless power transmission (Wireless power transfer) is first proposed by MIT in 2007, intensive research is rapidly initiated by related researchers around the world. However, the energy transmission mechanism of the magnetic coupling resonance type wireless power transmission still exists in the prior art, and the magnetic field is used as the medium of the energy transmission, and the size and the spatial distribution of the magnetic field have important significance for the research of the wireless power transmission mechanism in the magnetic coupling resonance state. Meanwhile, the thermal field distribution of the transmission space and the coil temperature rise research are very important for the reliability research and the transmission efficiency of the WPT system performance.
At present, magnetic field simulation is generally utilized to know the magnetic field situation, but various errors exist between simulation and actual situations, so that the measurement of the magnetic field distribution situation of the wireless power transmission device is of practical significance. The magnetic field measuring instruments in the market at the present stage are more in types, more precise instruments are high in price, large in size, low in measuring frequency range, poor in measuring applicability to a wireless power transmission system and high in price. The research specially aiming at the measurement of the space alternating magnetic field of the magnetic coupling resonance type WPT system is less, so that the research and development of a set of instruments for realizing the measurement of the space magnetic field of the WPT system are necessary.
The magnetic field comprises a natural magnetic field and an artificial magnetic field as a whole, wherein the natural magnetic field can be subdivided into a geomagnetic field and a biological magnetic field, and the magnetic fields are classified more finely along with the development of the understanding and detection technology. According to the magnetic field intensity, the method can be divided into: super-strong magnetic field (more than 10T) and medium-strong magnetic field (10)-4-10T), weak magnetic field (10)-9-10-4T) and weak magnetic field (less than 10)-9T), etc.; with the frequency of the magnetic field as a division criterion, the magnetic field can be divided into: a static magnetic field, a direct current magnetic field, a pulsed magnetic field, an alternating current magnetic field; the magnetic field is excited by a static current, the alternating magnetic field is a variable magnetic field, and the direction and the size of the magnetic field are not constant and change along with time. In time-varying magnetic fields, there is a very common time-varying form, namely a change in the amount of field over time in the form of a sine or cosine, called a time-harmonic electromagnetic field. The effects of different magnetic fields also differ, so that different measurement methods are required for different magnetic fields.
According to different magnetic field characteristics, different measuring methods are required, and the device mainly studies the measurement of the alternating magnetic field. The skin effect and eddy current effect are usually generated when the conductive medium is put into an alternating magnetic field. Depending on the conductive medium, some other effects may also occur. For example, a closed coil can have an electromagnetic induction phenomenon under the action of an alternating magnetic field, a rectangular semiconductor generates a Hall effect in the alternating magnetic field, and a ferromagnetic material can show a magnetoresistive effect. These principles can be used to measure an alternating magnetic field, and the main methods for measuring an alternating magnetic field include: an induction coil method, a hall effect method, a fluxgate method, a superconducting effect method, a magnetoresistance effect method, and the like.
(1) Method of induction coil
The induction coil method measures the magnetic field using the coil as a sensing probe. The detection precision can reach 20FT at the weakest, and no upper limit of measurement exists. The measuring frequency of the measuring method is 1Hz-1MHz, but the measuring magnetic field is very easily influenced by the environment, and the resistance, the inductance, the output circuit and the like of the detecting coil can influence the frequency response characteristic of the sensor.
(2) Fluxgate method
Fluxgate sensors were first used in the thirties of the last century to measure the earth's magnetic field, and have evolved to the present time with a number of improvements. The fluxgate sensor can measure the magnetic field intensity as 10-6～102G direct current or slowly varying alternating current magnetic field. It is mainly characterized by that it utilizes the soft magnetic material with high magnetic conductivity as magnetic core, and utilizes Faraday's law of electromagnetic induction and subsaturation principle of magnetic core in alternating magnetic field to develop and measure magnetic fieldProvided is a device. In recent years, with the development of industrial information science and technology, the appearance of some soft magnetic materials with low loss, low magnetostriction, low coercive force, high magnetic permeability and high saturation magnetic effect and the application of computer technology make the fluxgate sensor develop towards the direction of integration and miniaturization, and the price of the fluxgate sensor is reduced. The three-component fluxgate sensor is mainly applied to the aspect of measuring a weak magnetic field, has the characteristics of small volume, high stability and simple installation, and is used in the occasions of magnetic field measurement in ships, geomagnetism, magnetic detection stations, wells, metal detection and the like.
The weak magnetic field is measured by utilizing the magnetic modulation principle, namely, under the saturation excitation action of an alternating magnetic field, the magnetic induction intensity of the magnetic core of the iron core material in the magnetic field has a nonlinear relation with the magnetic field intensity. The fluxgate method mainly comprises a non-harmonic selection method and a harmonic selection method, wherein the first method is to consider all frequency spectrums of the induced electromotive force of the measuring probe without filtering; the second is to measure only even harmonics and filter out other harmonics.
(3) Hall effect method
The hall effect is that a conductor is placed in a magnetic field to be measured, and when the direction of current passing through the conductor is vertical to the direction of the magnetic field, a potential difference appears on a surface vertical to both the direction of the current and the direction of the magnetic field. The Hall effect is essentially the Lorentz force experienced during electronic drift. Since the semiconductor has a smaller number of free electrons, the drift velocity of the electrons is relatively large, resulting in a larger lorentz force and thus a larger hall voltage, and the semiconductor has a more pronounced hall effect than the conductor.
With the rise of semiconductor devices in the 60's of the 20 th century, the method is widely applied to actual magnetic field measurement, and the technology is mature. However, the hall device is easily affected by temperature, the measurement range is generally from a constant magnetic field to an alternating magnetic field of 1MHz, when the frequency is higher, the temperature of the hall device also rises, and the measurable magnetic field intensity is greatly weakened. Secondly, its noise level and sensitivity are also to be further improved.
(4) Magnetoresistance effect method
The magnetoresistance effect refers to a phenomenon that a metal or a semiconductor is changed correspondingly under the action of an external magnetic field. Giant magnetoresistive sensors (GMR), anisotropic magnetoresistive sensors (AMR), etc. are made using the magnetoresistive effect. The anisotropic magneto-resistance sensor is widely applied, and has the characteristics of low power consumption, small volume, good frequency response and smaller sensitivity range.
(5) Magneto-optical effect method
Magneto-optical effects were discovered by british physicists and chemists as early as 1845. The magneto-optical effect method is to apply the effect, and to put light-transmitting substances into a magnetic field, the magneto-optical effect can change the phase, amplitude or polarization state of light.
Since 1976, optical fiber communication technology and optoelectronic technology have been developed rapidly, and the rapid development of some technologies has led to the application of optical fiber sensing technology to magnetic field measurement. The optical fiber does not influence the measured field and has the characteristics of high temperature resistance, corrosion resistance, high pressure resistance and the like, so that the optical fiber sensor can be normally used in a worse environment, such as the strong magnetic field in a superconducting magnet. In addition, the device also has the advantages of small volume, light weight, wide frequency band, high sensitivity, large dynamic range and the like. But its cost is high, which is also an important factor affecting its wide application.
(6) Superconducting effect method
The principle of the superconducting effect method is that the critical current in the superconducting junction fluctuates with the period of the magnetic field, and people use the phenomenon to measure the magnetic field. Because the low-temperature environment of the superconducting material is difficult to reach, at present, the research is mainly carried out on high-temperature superconductivity, for example, a superconducting quantum interference device (SQUID) is a very typical high-temperature superconducting magnet measuring instrument. The SQUID can induce magnetic field in f T-9T range, and the magnetic field produced by human brain is about several tens of f T, and this excellent characteristic makes SQUID widely used in medicine field for measuring magnetic field of human brain, heart, muscle, etc. and providing important information for disease analysis and diagnosis. This method offers the possibility of measuring ultra-weak magnetic fields, but the cost is also very high.
(7) Electromagnetic induction method
The electromagnetic induction method for measuring magnetic fields is a very classical method for measuring magnetic fields. The applied principle is Faraday's law of electromagnetic induction, which shows: when the magnetic flux changes in the area S enclosed by the conductor loop l, the loop will generate an induced electromotive force, and an induced current is generated when the loop is closed.
Therefore, the field intensity of the variable magnetic field is measured by the electromagnetic induction method, and the magnetic induction intensity is calculated by measuring the induced electromotive force at the two ends of the induction coil. By using the method, various magnetic fields such as an alternating current magnetic field, a pulse magnetic field, a direct current magnetic field and the like can be measured. When measuring a direct current magnetic field, the purpose of measurement is achieved by moving or rotating the coil to change the magnetic flux in the coil. This method is simple and practical.
The measurement methods of the alternating magnetic field are numerous, the principle of the different measurement methods is briefly described above, and the following table briefly compares these several main methods. Considering the object to be measured as the magnetic field of the space of the wireless power transmission system, the frequency range of the measurement is 100kHz to 3MHz, and the magnetic induction intensity is 10-6～10-4T, the electromagnetic field of a spatial point needs to be measured, so the size of the magnetic sensor needs to be as small as possible. And finally, an electromagnetic induction method is selected to measure the spatial magnetic field by combining the existing conditions of the laboratory.
TABLE 1 comparison of magnetic field measurement methods
Electric field measurement
The electric field measurement principle is that electric charges are induced in an electric field by a capacitor, and the electric charges generate a voltage difference
Calculating to obtain potential difference, and then the relation between the potential difference and the electric field
And obtaining an electric field value.
Meanwhile, at present, devices for measuring the temperature rise of a transmitting and receiving coil of a high-power wireless power transmission system and an integral instrument suitable for measuring a thermal field in a wireless power transmission working interval are few, but the devices are necessary and vital for power electronic devices and wireless power transmission systems with increasingly-increased power.
The wireless power transmission technology utilizes electromagnetic fields and electromagnetic waves to realize distribution and propagation of physical space, adopts non-conductive direct contact, and realizes the technology of transmitting power from a power supply side to a load side. Wireless power transmission technology gradually advances into people's lives, so that the biological effect and the technical safety of the technology are concerned more and more. Electromagnetic fields exist between the receiving coil and the transmitting coil of the radio energy transmission system, so that accurate measurement of the size and distribution of the electromagnetic fields in the propagation interval is necessary, which is also significant for the improvement and optimization of the whole system. Meanwhile, as the demand of power electronic products for electric energy power is continuously increased, the power and transmission distance of the wireless electric energy transmission technology are continuously increased. The increase in transmission power results in a continuous increase in coil losses and thus in coil temperature rise. The temperature rise of the coil causes the problems of material aging, insulation damage, performance reduction and the like, so that the temperature measuring device has important significance for the temperature measurement between the transmitting and receiving coil and the transmission area of the wireless power transmission system.
Through the above analysis, the problems and defects of the prior art are as follows: at present, related equipment and devices for magnetic field measurement and dynamic magnetic field measurement exist, but on the basis of the related equipment and devices, the temperature rise of a coil and the thermal characteristics of a wireless energy transmission system are less, or the related equipment and devices are not paid much attention. However, as the wireless power transmission technology is more mature, the transmission power thereof is greater, and the importance of thermal management thereof is more prominent, so it is necessary to develop an instrument device for measuring the magnetic field and the temperature field of the wireless power transmission system.
The difficulty in solving the above problems and defects is: at present, analysis methods for wireless power transmission systems are mainly classified into indirect back-stepping methods and direct analysis methods. The indirect backstepping method mainly comprises the steps of changing key circuit parameters such as a receiving and transmitting distance and resonance parameters in a test system, obtaining input and output power under different parameters, then backstepping the transmission efficiency and mutual inductance coupling coefficient of the system, and verifying the existing theoretical model. The direct analysis method is to directly measure the spatial magnetic field intensity, establish a spatial magnetic field distribution model, and analyze and obtain magnetic field parameters. Compared with an indirect back-stepping method, the direct analysis method based on the space magnetic field measurement and analysis is simpler and more effective.
The significance of solving the problems and the defects is as follows: the invention provides a method and a testing device for measuring a magnetic field and a temperature field between coils in a wireless power transmission system, and simultaneously measures the temperature of a characteristic point of a transmission coil, thereby realizing the precise measurement of space high-frequency magnetic field parameters and temperature parameters. The method has certain reference significance for stable and reliable operation of a high-power wireless electric energy transmission system and a heat management technology.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a system and a method for testing transmission power, magnetism, heat and temperature rise of wireless electric energy.
The invention is realized in this way, a wireless electric energy transmission power, magnetism, heat and temperature rise test system, the wireless electric energy transmission power, magnetism, heat and temperature rise test system includes:
the initialization module is used for initializing the system;
the guide rail motion control module comprises a stepping motor controller communication unit, a control unit and a scanning unit; the device is used for driving the magnetic field probe to accurately position and collecting the measurement data of the designated position of each point in the space; simultaneously, the device is used for performing controllable automatic movement by controlling the stepping motor;
the magnetic field measurement module comprises an electromagnetic field instrument communication unit, a parameter setting unit, a command sending unit, a measurement unit, a data reading unit and a storage unit; the device is used for automatically measuring the electric field, the magnetic field and the temperature field values at different points;
and the data processing module is used for processing the data, performing magnetic field synthesis and drawing a smooth three-dimensional curved surface graph through an interpolation algorithm.
Further, the guide rail motion control module includes:
the stepping motor controller communication unit is used for communicating with the stepping motor controller through a serial port;
the control unit is used for controlling the guide rail to operate;
and the scanning unit is used for performing coordinated motion of the two axes and scanning the whole plane.
Further, the magnetic field measurement module includes:
the electromagnetic field instrument communication unit is used for communicating with the electromagnetic field instrument through a serial port;
the parameter setting unit is used for setting parameters of the acquired data;
the command sending unit is used for sending a data acquisition command to the electromagnetic field probe and the thermal imager;
the measuring unit is used for measuring data and a temperature field by the electromagnetic field probe and the thermal imager based on the data acquisition command;
the data reading unit is used for reading data collected by the electromagnetic field probe and the thermal imager;
a storage unit for storing magnetic field value data.
Another object of the present invention is to provide a wireless power transmission power, magnetism, heat and temperature rise test method applied to the wireless power transmission power, magnetism, heat and temperature rise test system, wherein the wireless power transmission power, magnetism, heat and temperature rise test method includes:
the guide rail is controlled to move automatically, the magnetic field probe is driven to automatically measure the magnetic field, the measured data is processed, and a smooth three-dimensional curved surface graph of the intensity distribution of the electromagnetic field is output.
Further, the wireless electric energy transmission power, magnetism, heat and temperature rise testing method comprises the following steps:
step one, setting related serial port parameters of guide rail movement, guide rail movement step number, step length and other parameters;
step two, controlling the X axis to move by one step;
acquiring and storing primary data, simultaneously moving the Y axis by one step, and storing Y-axis coordinates;
step four, judging whether the Y axis reaches the preset movement times, if not, returning to the step three; if the preset movement times are reached, turning to the fifth step;
acquiring and storing primary data, and storing X-axis coordinates; judging whether the X axis reaches a preset number of times of movement, if not, returning to the step two; if the preset movement times are reached, turning to the step six;
and sixthly, the guide rail returns to the original position, the acquired data is processed, magnetic field synthesis is carried out, and a smooth three-dimensional curved surface graph is drawn through an interpolation algorithm.
Further, in the sixth step, the processing the acquired data, performing magnetic field synthesis, and drawing a smooth three-dimensional curved surface graph by an interpolation algorithm includes:
(1) collecting the magnetic field strength value of each point for 50 times, and carrying out median filtering on the obtained 50 data to obtain data serving as the magnetic field strength value of the point;
(2) synthesizing the obtained X, Y, Z three-direction magnetic field strength to obtain a total magnetic field;
(3) and carrying out interpolation processing on the obtained total electromagnetic field intensity value at each sampling point, and generating a smooth three-dimensional curved surface diagram by using the processed matrix data through a three-dimensional diagram display control.
Further, in the step (3), the performing interpolation processing includes: and (4) performing interpolation processing by adopting a nearest neighbor interpolation method, a linear interpolation method, a cubic interpolation method and a spline interpolation method.
Further, in the step (3), the generating a smooth three-dimensional surface graph from the processed matrix data by using the three-dimensional graph display control includes:
inputting X, Y axis position data and magnetic field data in an array form, establishing a matlab node, transmitting the data to a matlab script node, performing two-dimensional interpolation in the matlab node by using a matlab two-dimensional interpolation function griddata, and selecting four interpolation modes through a conditional structure; and transmitting the two-dimensional interpolation result from the matlab script node, and connecting the two-dimensional interpolation result to the three-dimensional curved surface control, namely outputting a smooth three-dimensional curved surface graph.
It is another object of the present invention to provide a computer program product stored on a computer readable medium, comprising a computer readable program for providing a user input interface to implement the wireless power transfer power, magnetic, thermal and temperature rise test method when executed on an electronic device.
It is another object of the present invention to provide a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the wireless power transmission power, magnetic, thermal and temperature rise testing method.
By combining all the technical schemes, the invention has the advantages and positive effects that: the invention measures the temperature change condition of the coil at the characteristic position on the transceiver coil through the thermocouple temperature sensor, and monitors the heat change condition of the wireless power transmission area by adopting an infrared thermal imager. On the basis, three-dimensional magnetic field visualization, heat temperature visualization and magnetic field and temperature field change in the wireless power transmission system are realized.
The invention utilizes the electromagnetic field at the central plane of the coupler of the wireless power transmission system to measure, simultaneously measures the temperature of the characteristic point of the coil through the thermistor, and simultaneously measures the heating condition of the central plane of the coupler through the thermal imager.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a structural frame diagram of a wireless power transmission power, magnetic, thermal and temperature rise test system according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a wireless power transmission, magnetic, thermal and temperature rise test system according to an embodiment of the present invention;
in the figure: 1. initializing a module; 2. a guide rail motion control module; 3. a magnetic field measurement module; 4. and a data processing module.
Fig. 3 is a schematic diagram of a method for testing transmission power, magnetism, heat and temperature rise of wireless power according to an embodiment of the present invention.
Fig. 4 is a flowchart of a method for testing transmission power, magnetism, heat and temperature rise of wireless power according to an embodiment of the present invention.
Fig. 5 is a three-dimensional diagram of the magnetic field of the central plane of the coil provided by the embodiment of the invention.
Fig. 6 is a three-dimensional diagram of the electric field at the central plane of the coil provided by the embodiment of the invention.
Fig. 7 is a diagram illustrating the effect of the temperature field distribution test provided by the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In view of the problems in the prior art, the present invention provides a system and a method for testing transmission power, magnetism, heat and temperature rise of wireless energy, and the present invention is described in detail with reference to the accompanying drawings.
As shown in fig. 1-2, a wireless power transmission power, magnetism, heat and temperature rise test system according to an embodiment of the present invention includes:
the initialization module 1 is used for initializing a system;
the guide rail motion control module 2 comprises a stepping motor controller communication unit, a control unit and a scanning unit; the device is used for driving the magnetic field probe to accurately position and collecting the measurement data of the designated position of each point in the space; meanwhile, the device is used for performing controllable automatic movement by controlling the stepping motor;
the magnetic field measurement module 3 comprises an electromagnetic field instrument communication unit, a parameter setting unit, a command sending unit, a measurement unit, a data reading unit and a storage unit; the device is used for automatically measuring the electric field, the magnetic field and the temperature field values at different points;
and the data processing module 4 is used for processing the data, synthesizing a magnetic field and drawing a smooth three-dimensional curved surface graph through an interpolation algorithm.
The guide rail motion control module 2 provided by the embodiment of the invention comprises:
the stepping motor controller communication unit is used for communicating with the stepping motor controller through a serial port;
the control unit is used for controlling the guide rail to operate;
and the scanning unit is used for performing coordinated motion of the two axes and scanning the whole plane.
The magnetic field measurement module 3 provided by the embodiment of the invention comprises:
the electromagnetic field instrument communication unit is used for communicating with the electromagnetic field instrument through a serial port;
the parameter setting unit is used for setting parameters of the acquired data;
the command sending unit is used for sending a data acquisition command to the electromagnetic field probe and the thermal imager;
the measuring unit is used for measuring data and a temperature field by the electromagnetic field probe and the thermal imager based on the data acquisition command;
the data reading unit is used for reading data collected by the electromagnetic field probe and the thermal imager;
a storage unit for storing magnetic field value data.
As shown in fig. 3, the method for testing power transmission, magnetism, heat and temperature rise of wireless power transmission provided by the embodiment of the present invention includes driving a magnetic field probe to automatically measure a magnetic field by controlling automatic movement of a guide rail, processing measurement data, and outputting a smooth three-dimensional curved surface diagram of electromagnetic field intensity distribution.
As shown in fig. 4, the method for testing power transmission, magnetism, heat and temperature rise of wireless power provided by the embodiment of the present invention includes the following steps:
s101, setting parameters of serial ports related to guide rail movement, guide rail movement steps, step lengths and other parameters;
s102, controlling the X axis to move by one step;
s103, acquiring and storing primary data, simultaneously moving the Y axis by one step, and storing Y-axis coordinates;
s104, judging whether the Y axis reaches the preset movement times, if not, returning to the step S103; if the preset number of times of movement is reached, turning to step S105;
s105, acquiring and storing primary data, and storing an X-axis coordinate; judging whether the X axis reaches the preset movement times or not, if not, returning to the step S102; if the preset movement times are reached, turning to step S106;
and S106, the guide rail returns to the original position, the acquired data is processed, magnetic field synthesis is carried out, and a smooth three-dimensional curved surface graph is drawn through an interpolation algorithm.
In step S106, the processing the acquired data, performing magnetic field synthesis, and drawing a smooth three-dimensional surface map by an interpolation algorithm according to the embodiments of the present invention includes:
(1) collecting the magnetic field strength value of each point for 50 times, and carrying out median filtering on the obtained 50 data to obtain data serving as the magnetic field strength value of the point;
(2) synthesizing the obtained X, Y, Z three-direction magnetic field strength to obtain a total magnetic field;
(3) and carrying out interpolation processing on the obtained total electromagnetic field intensity value at each sampling point, and generating a smooth three-dimensional curved surface diagram by using the processed matrix data through a three-dimensional diagram display control.
In step (3), the interpolation processing provided by the embodiment of the present invention includes: and (4) performing interpolation processing by adopting a nearest neighbor interpolation method, a linear interpolation method, a cubic interpolation method and a spline interpolation method.
In step (3), the generating of the smooth three-dimensional curved surface graph by using the three-dimensional graph display control unit on the processed matrix data according to the embodiment of the present invention includes:
inputting X, Y axis position data and magnetic field data in an array form, establishing a matlab node, transmitting the data to a matlab script node, performing two-dimensional interpolation in the matlab node by using a matlab two-dimensional interpolation function griddata, and selecting four interpolation modes through a conditional structure; and transmitting the two-dimensional interpolation result from the matlab script node, and connecting the two-dimensional interpolation result to the three-dimensional curved surface control, namely outputting a smooth three-dimensional curved surface graph.
The technical solution of the present invention is further described below with reference to specific examples.
Example 1:
the electric field and magnetic field intensity measurement of wireless electric energy transmission needs to realize the automatic measurement of the magnetic field intensity of each point in the wireless electric energy transmission area, and corresponding data processing is carried out to draw a three-dimensional curved surface graph representing the distribution of the electric field and the magnetic field. The construction of the overall measurement hardware system comprises an overall structure design, an electromagnetic field, a magnetic field, a temperature field measurement part, a mechanical structure part and a motion control part.
1. Measuring system overall structure
Based on a magnetic coupling type wireless power transmission system, in order to visually know the distribution conditions of an electric field, a magnetic field and a temperature field among receiving and transmitting resonators and improve the performance of the wireless power transmission system, a set of spatial electric field-magnetic field-thermal field multi-field measurement system of the wireless power transmission system is designed. Fig. 3 is a schematic diagram of a measurement design of a wireless power transmission system. The LABVIEW is used for compiling a program of an upper computer, controlling the motion of a related mechanical structure and the distribution of an electromagnetic field probe through serial port communication to measure an electric field and a magnetic field, giving a starting signal to a thermal imager and starting measuring and recording a temperature field.
The mechanical structure is as follows: the electromagnetic field probe is driven by the mechanical structure to measure each point of the coupler section, and simultaneously the required stepping progress requirement is met.
Electromagnetic field measurement: and selecting a probe with the precision and the range meeting the requirements, and simultaneously testing the electric field intensity and the magnetic field intensity.
Temperature field: and selecting a proper thermocouple resistor to measure key points of the wireless power transmission coil, and simultaneously measuring and drawing a space temperature field by using a high-precision thermal imager.
And (3) motion control: the accurate and instant control of the mechanical structure is realized, and the machine runs according to the specified route and speed.
Data processing and analysis: and the storage of the measured data is realized, the data post-processing is carried out, and a three-dimensional curved surface diagram of the electric field, the magnetic field and the temperature field strength is drawn.
The system works as a whole as follows: the distance between the transmitting coil and the receiving coil is manually adjusted, and the position of the sensor probe is adjusted through a mechanical structure. And starting the wireless electric energy transmission system, and simultaneously giving an instruction by the upper computer to control the electromagnetic magnetic sensor probe to realize the acquisition of the magnetic field intensity data of the target path or region. And recording the change condition of the thermocouple resistance detection temperature and the change of the monitoring temperature interval of the thermal imager. And the measurement information of the electromagnetic field probe is stored in an upper computer, and the drawing of the three-dimensional graph of the electric field, the magnetic field and the temperature field intensity is realized through data processing and analysis.
2. System software design
The electric field, the magnetic field and the temperature field are automatically measured through the electromagnetic field probe and the thermal infrared imager, and after the system hardware part is built, corresponding programs need to be written for the system hardware part to complete the functions of the whole system. The system software mainly performs the following functions:
(1) and measuring electric, magnetic and temperature field fields. Magnetic field measurement is the key of the system, and the magnetic field measurement is mainly realized by software. The PC is communicated with the serial port of the magnetic field measuring probe, a data acquisition command is sent to the electromagnetic field probe, the measured data is received, and meanwhile, a command is sent to the thermal imager to start temperature field measurement.
(2) And controlling the motion of the guide rail. The software of the guide rail motion control part needs to drive the magnetic field probe to accurately position and complete the acquisition of the measurement data of the designated position of each point in the space.
(3) And (6) data processing. According to the system requirements, the final result should be a smooth three-dimensional curved surface diagram to visually understand the distribution trend of the magnetic field, so that the data needs to be processed.
2.1 System measurement Module software design
The magnetic field measurement module is completed by a probe of a magnetic field analyzer, and in order to realize automatic measurement of electric fields and magnetic field values at different points, programs are written by the magnetic field measurement module to read the electromagnetic field values. The EHP-200 allows a user to configure instruments and query data via the serial communication interface, and the specific functions that the software needs to implement are as follows:
(1) communicate with an electromagnetic field instrument through a serial port
(2) Setting parameters of acquired data
(3) Reading the collected data
(4) Storing magnetic field value data
2.2 guide movement Module software design
The A guide rail movement module software functions are as follows:
the guide rail movement module drives the magnetic field measuring probe to a specified position to acquire electric field intensity and magnetic field intensity data. The stepping motor is written through an LABVIEW on the upper computer and used for controlling the stepping motor to realize controllable automatic movement. The stepping motor is driven by a driver, and the controller is connected with the driver to send pulses to the driver to control the movement of the stepping motor. The module software mainly realizes the following functions:
(1) realize communication with step motor controller through serial ports
(2) Software controlled rail operation
(3) Realize the coordinated movement of two shafts and realize the scanning of the whole plane
B, realizing guide rail movement module software:
2.3 data processing Module software design
2.3.1 data processing Module function:
according to the requirements of the device system, the relevant data of the electric field and the magnetic field are obtained through the electromagnetic field probe, are transmitted to the upper computer to be processed correspondingly and are drawn into a three-dimensional image, and the part is finished by the upper computer software.
(1) Processing the collected data
(2) Magnetic field synthesis
(3) Drawing smooth three-dimensional surface graph by interpolation algorithm
2.3.2 data processing principle:
a data filtering method
Because the electromagnetic field exists in the space in life, the values of the electric field and the magnetic field fluctuate in a small range, and the measured magnetic field fluctuates in a small range, so that the accidental phenomenon exists when each point collects one value as the data of the electric field and the magnetic field, and the distribution condition of the magnetic field cannot be expressed correctly. Therefore, a plurality of data are required to be collected and processed to obtain the values of the available electric field and the available magnetic field.
According to the specific situation of the system, a median average filtering method is adopted for data filtering. The method is a filtering algorithm combining a median filtering method and an arithmetic mean filtering method, and the principle of the method is to collect N data, remove the largest and the smallest of the N data, and calculate the arithmetic mean of the rest data as the final data. According to the principle, the maximum value and the minimum value are removed mainly to reduce the influence of accidental errors, and the arithmetic mean value is mainly used for random errors, so that the method has a filtering effect on both accidental errors and random errors.
B data interpolation processing
Due to the fact that the LABVIEW has certain limitation on the aspect of a data interpolation algorithm, the MATLAB and the LABVIEW are introduced to realize functions. The MATLAB two-dimensional interpolation algorithm comprises the following steps:
(1) nearest neighbor interpolation: the method uses the step function for interpolation, and has the advantages of high speed, but the obtained interpolation result is not smooth enough.
(2) Linear interpolation method: interpolation mainly utilizes piecewise linear functions, and is fast, but the smoothness at sampling points is poor.
(3) Cubic interpolation: interpolation is mainly performed by using cubic polynomials, and the method has the advantages of good smoothness performance at sampling points and low efficiency.
(4) Spline interpolation method: the interpolation is carried out by utilizing the piecewise cubic polynomial function, and the interpolation result obtained by the method has good smoothness and high speed.
2.3.3 data processing module implementation:
(1) and (5) data filtering processing. According to the data filtering principle applied by the system, the magnetic field strength value of each point is collected for 50 times, a maximum value and a minimum value are removed from 50 obtained data, the rest 8 data are averaged, and the obtained data are used as the magnetic field strength value of the point.
(2) And (4) magnetic field synthesis. According to the analysis, the X, Y, Z three directional magnetic field strengths need to be combined to obtain the total magnetic field.
(3) And (4) interpolating the processed data to generate a three-dimensional graph. The method comprises the steps of performing electromagnetic field synthesis on acquired data to obtain a total electromagnetic field intensity value at each sampling point, performing interpolation processing on the data by using MATLAB in order to obtain smooth three-dimensional curved surface images and visually display the branch conditions of the magnetic field, then transmitting the processed matrix data back to LABVIEW, and generating the smooth three-dimensional curved surface images by using a three-dimensional image display control.
The program inputs X, Y axis position data and magnetic field data which are input in an array form, establishes a matlab node, transmits the data to a matlab script node, performs two-dimensional interpolation in the matlab node by using a matlab two-dimensional interpolation function griddata, and selects four interpolation modes through a conditional structure.
And transmitting the two-dimensional interpolation result from the matlab script node, connecting the two-dimensional interpolation result to the three-dimensional curved surface control, and outputting a smooth three-dimensional curved surface graph.
2.4 System Overall program implementation
After three module programs of magnetic field measurement, motion control and data processing of system software are written respectively, the three module programs are integrated into an integral upper computer program of the system, automatic motion of the guide rail is realized, a magnetic field probe is driven to automatically measure the magnetic field, and finally, data processing is automatically carried out and a smooth three-dimensional curved surface diagram of the intensity distribution of the electromagnetic field is output.
3. Measuring effects
Due to the fact that the space coupling characteristic of the electromagnetic field distributed wireless power transmission system at the central plane of the coupler is expressed, the electromagnetic field at the central plane of the coupler of the wireless power transmission system is selected for measurement.
Due to the limited measuring travel of the mechanical arm, only 1/4 or 1/2 of the whole plane can be tested in some cases, and the rest of the magnetic field is spliced by MATLAB according to the symmetry of the magnetic field.
Due to the limited measuring travel of the mechanical arm, only 1/4 or 1/2 of the whole plane can be tested in some cases, and the rest of the magnetic field is spliced by MATLAB according to the symmetry of the magnetic field.
The temperature of the characteristic point of the coil is measured through the thermistor, and meanwhile, the heating condition of the central plane of the coupler is measured through the thermal imager.
It should be noted that the embodiments of the present invention can be realized by hardware, software, or a combination of software and hardware. The hardware portion may be implemented using dedicated logic; the software portions may be stored in a memory for execution by a suitable instruction execution system, such as a microprocessor or specially designed hardware. Those skilled in the art will appreciate that the apparatus and methods described above may be implemented using computer executable instructions and/or embodied in processor control code, such code being provided, for example, on a carrier medium such as a diskette, CD-or DVD-ROM, a programmable memory such as read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The apparatus and its modules of the present invention may be implemented by hardware circuits such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field programmable gate arrays, programmable logic devices, or software executed by various types of processors, or a combination of the above hardware circuits and software, for example, firmware.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A wireless power transmission power, magnetism, heat and temperature rise test system, characterized in that, wireless power transmission power, magnetism, heat and temperature rise test system includes:
the initialization module is used for initializing the system;
the guide rail motion control module comprises a stepping motor controller communication unit, a control unit and a scanning unit; the device is used for driving the magnetic field probe to accurately position and collecting the measurement data of the designated position of each point in the space; meanwhile, the device is used for performing controllable automatic movement by controlling the stepping motor;
the magnetic field measurement module comprises an electromagnetic field instrument communication unit, a parameter setting unit, a command sending unit, a measurement unit, a data reading unit and a storage unit; the device is used for automatically measuring the electric field, the magnetic field and the temperature field values at different points;
and the data processing module is used for processing the data, synthesizing the magnetic field and drawing a smooth three-dimensional curved surface graph through an interpolation algorithm.
2. The wireless power transmission power, magnetic, thermal and temperature rise test system of claim 1, wherein the guide rail motion control module comprises:
the stepping motor controller communication unit is used for communicating with the stepping motor controller through a serial port;
the control unit is used for controlling the guide rail to operate;
and the scanning unit is used for performing coordinated motion of the two axes and scanning the whole plane.
3. The wireless power transmission power, magnetism, heat and temperature rise test system of claim 1, wherein the magnetic field measurement module comprises:
the electromagnetic field instrument communication unit is used for communicating with the electromagnetic field instrument through a serial port;
the parameter setting unit is used for setting parameters of the acquired data;
the command sending unit is used for sending a data acquisition command to the electromagnetic field probe and the thermal imager;
the measuring unit is used for measuring data and a temperature field by the electromagnetic field probe and the thermal imager based on the data acquisition command;
the data reading unit is used for reading data collected by the electromagnetic field probe and the thermal imager;
a storage unit for storing magnetic field value data.
4. A wireless power transmission power, magnetism, heat and temperature rise test method applied to the wireless power transmission power, magnetism, heat and temperature rise test system according to any one of claims 1 to 3, wherein the wireless power transmission power, magnetism, heat and temperature rise test method comprises: the guide rail is controlled to move automatically, the magnetic field probe is driven to automatically measure the magnetic field, the measured data is processed, and a smooth three-dimensional curved surface graph of the intensity distribution of the electromagnetic field is output.
5. The method for testing power transmission, magnetism, heat, and temperature rise of wireless power according to claim 4, wherein the method for testing power transmission, magnetism, heat, and temperature rise of wireless power comprises the steps of:
step one, setting related serial port parameters of guide rail movement, guide rail movement step number, step length and other parameters;
step two, controlling the X axis to move by one step;
acquiring and storing primary data, simultaneously moving the Y axis by one step, and storing Y-axis coordinates;
step four, judging whether the Y axis reaches the preset movement times, if not, returning to the step three; if the preset movement times are reached, turning to the fifth step;
acquiring and storing primary data, and storing X-axis coordinates; judging whether the X axis reaches the preset movement times or not, if not, returning to the step two; if the preset movement times are reached, turning to the step six;
and sixthly, the guide rail returns to the original position, the acquired data is processed, magnetic field synthesis is carried out, and a smooth three-dimensional curved surface graph is drawn through an interpolation algorithm.
6. The method for testing transmission power, magnetism, heat and temperature rise of wireless power according to claim 5, wherein in step six, the processing the collected data, the magnetic field synthesis, and the drawing of the smooth three-dimensional curved surface graph by the interpolation algorithm comprise:
(1) collecting the magnetic field strength value of each point for 10 times, and carrying out median filtering on the obtained 10 data to obtain data serving as the magnetic field strength value of the point;
(2) synthesizing the obtained X, Y, Z three-direction magnetic field strength to obtain a total magnetic field;
(3) and carrying out interpolation processing on the obtained total electromagnetic field intensity value at each sampling point, and generating a smooth three-dimensional curved surface diagram by using the processed matrix data through a three-dimensional diagram display control.
7. The method for testing power transmission, magnetism, heat, and temperature rise of wireless power according to claim 6, wherein in the step (3), the performing interpolation processing includes: and (4) performing interpolation processing by adopting a nearest neighbor interpolation method, a linear interpolation method, a cubic interpolation method and a spline interpolation method.
8. The method for testing transmission power, magnetism, heat and temperature rise of wireless power according to claim 6, wherein in the step (3), the step of generating a smooth three-dimensional surface map by using the processed matrix data and the three-dimensional map display control comprises:
inputting X, Y axis position data and magnetic field data in an array form, establishing a matlab node, transmitting the data to a matlab script node, performing two-dimensional interpolation in the matlab node by using a matlab two-dimensional interpolation function griddata, and selecting four interpolation modes through a condition structure; and transmitting the two-dimensional interpolation result from the matlab script node, and connecting the two-dimensional interpolation result to the three-dimensional curved surface control to output a smooth three-dimensional curved surface graph.
9. A computer device, characterized in that the computer device comprises a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to carry out the steps of: the guide rail is controlled to move automatically, the magnetic field probe is driven to automatically measure the magnetic field, the measured data is processed, and a smooth three-dimensional curved surface graph of the intensity distribution of the electromagnetic field is output.
10. A computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of: the guide rail is controlled to move automatically, the magnetic field probe is driven to automatically measure the magnetic field, the measured data is processed, and a smooth three-dimensional curved surface graph of the intensity distribution of the electromagnetic field is output.
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