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48results about How to "Low test conditions" patented technology

Method for determining rock conjugate damage strength through adopting supersonic waves

The invention relates to a method for determining the rock conjugate damage strength through adopting supersonic waves. The method concretely comprises the following operations: 1, respectively arranging a pair of longitudinal wave probes on two ends of two mutually perpendicular diameters on a cross section in the middle of a rock sample, and respectively continuously testing rock sound wave speeds between the two mutually perpendicular diameters of the rock sample in a short time (such as 1-3s) interval in the rock sample loading process until the rock sample is destroyed; and 2, finishing the changing process of two mutually perpendicular radial sound wave longitudinal wave speeds with the axial stress of the rock sample after the test completion, and obtaining the rock conjugate damage strength which is the axial stress corresponding with the substantially reduced radial longitudinal wave speed. The rock sample longitudinal wave speed test of the two mutually perpendicular diameters is carried out to eliminate the error caused by axial crack orientation generated during the axial loading of the rock sample and improve the determination precision.
Owner:WUHAN UNIV

Accurate tester for sorbent and method thereof

The invention relates to an instrument and a method for precisely testing adsorbent, belonging to an instrument and a method for testing a single-component gas static state adsorption isotherm, a single-component gas static state adsorption isobar and other adsorbent characteristics and aiming at solving the problem that the instrument and the method existing in the prior art have high cost or limited application ranges. The testing instrument comprises an adsorption tank, an air intake adjusting valve which can be communicated with the adsorption tank and connected with the gas to be tested, a system pressure transducer communicated with the air intake adjusting valve, a compensation adjusting valve, a vacuum adjusting valve, a compensatory pressure transducer communicated with the compensation adjusting valve, a compensating tank of fixed volume and a single chip microcomputer electrically connected with the system pressure transducer and the compensatory pressure transducer. The method is a pressure compensating method adopting the testing instrument. The invention can be widely used for testing the performance of various industrial adsorbents or novel adsorbents like silica gel, molecular-sieve type activated carbon, and the like.
Owner:ALLY HI TECH CO LTD

Heat convection testing method and system for composite insulator including artificial defect

The invention provides a heat convection testing method and a system for a composite insulator including an artificial defect. The testing method comprises the steps of fixedly embedding a temperature measuring probe in the composite insulator and enabling the temperature measuring probe to be located on the junction face of a silicone rubber sheath and an epoxy resin core rod; adopting a direct current constant voltage source to perform power supply for the resistance defect of the composite insulator; utilizing the temperature measuring probe to perform real-time detection on the internal temperature of the composite insulator in the power supply process, recording the internal defect temperatures under different currents and using an infrared temperature measurement device to shoot and record the surface temperature distribution situation of the composite insulator; and performing compilation and analysis on recorded data to obtain the relation of the outer surface temperature rise and internal actual temperature rise of the composite insulator. The temperature measuring probe improvable in temperature and a special fixing method are adopted, reliable connecting strength, insulating strength and heating power can be achieved, and the measurement accuracy is finally ensured.
Owner:SHENZHEN POWER SUPPLY BUREAU

Method for measuring crust amine and chitin content in crust amine fibre and cotton blending product

The invention discloses a chitosan and chitin content measurement method in the chitosan fiber and cotton blended products. Acetic acid solution is used to separate the chitosan fiber on the blended product, and the chitosan content in the dissolved solution is measured through colloidal titration so as to obtain the chitosan content in the chitosan fiber and the cotton blended product; the chitosan fiber and the cotton blended product are treated with a sufficient amount of concentrated alkali to enable the chitin in the chitosan fiber to be fully converted into chitosan; then the chitosan content in the chitosan fiber and the cotton blended product after alkali treatment is measured according to the method for measuring the chitosan, and the chitosan content in the chitosan fiber and the cotton blended product is deducted from the measured chitosan content so as to obtain the chitin content in the chitosan fiber and the cotton blended product. The chitosan and chitin content measurement method has high measurement precision and accuracy, small toxicity of the reagent, less environmental pollution and easy operation, which provides a convenient, scientific and feasible detection method for the vast number of small and medium-sized enterprises and primary inspection agencies.
Owner:天奇智联(杭州)实业有限公司 +1

Method for testing initial position angle of motor rotor

The invention discloses a method for testing initial position angle of a motor rotor and solves the technical problem that the prior art is high in requirements on initial position angle testing conditions of the motor rotor and difficult in actual operation. The method includes following steps: step 1, applying a current i on a to-be-tested motor to enable the same to run; step 2, after the motor runs, enabling the current i to be zero; step 3, measuring voltage ud and uq of a shaft d and a shaft q of a motor stator; step 4, calculating according to a triangular function relation between ud and uq to acquire initial position angle deviation theta err of the motor rotor. The initial position angle deviation of the motor rotor is calculated by directly using the voltage of the d shaft and the q shaft of the motor stator, and corresponding relation between voltage at the motor end in a motor controller and the initial rotor position angle is made clear; the method is simple and suitable for engineering site operation; online fault diagnosis and error correction control can be realized, and system function safety can be improved.
Owner:JING JIN ELECTRIC TECH HEZE CO LTD

Heat supply process modeling method based on typical test signals and least squares

The invention discloses a heat supply process modeling method based on typical test signals and least squares, relating to a heat supply process modeling method. The invention solves the problem of low model precision, incapability of online operation, complex algorithm and incapability of identifying hysteresis of a heat process of the traditional modeling method. The heat supply process modeling method mainly comprises the steps of: obtaining a response curve of a unit pulse signal, a unit step signal and a unit ramp signal; obtaining an identification equation by a typical transfer function; identifying an unknown parameter of a second order and hysteresis object model by using the least squares; and discretizing to obtain a difference equation of a heat supply object. The modeling method provided by the invention can replace a common ascending curve method, and can obtain a high-precision model. The modeling precision is improved from 7 percent to a range of within 3 percent in comparison with that of the common ascending curve method, and hysteresis time of an object can be directly identified, and further measured by experiments replacing the common method.
Owner:HARBIN INST OF TECH

Function test method and device of DSP module in FPGA chip

ActiveCN107942240AGuaranteed functional correctnessLow test conditionsDigital circuit testingFunctional testingComputer module
The invention discloses a function test method and a function test device of a DSP module in an FPGA chip, and belongs to the field of FPGA chip technology. The function test method includes the stepsof performing the same function configuration on each DSP module inside an FPGA chip, and reading an input excitation into each DSP module through an MEM module inside the FPGA chip; conducting an XOR comparison between an output result of each DSP module with an expected output result stored in the MEM module to obtain multiple sets of multi-bit XOR results of each DSP module; and performing feedback OR operation on the multiple sets of multi-bit XOR results of each DSP module in sequence to feed back a previous set of OR operation results back sequentially to undergo OR operation with the following set, so that the multiple sets of multi-bit XOR results are finally reduced to one bit output to obtain a test result of each DSP module. According to the invention, the requirement on test conditions can be minimized, and the function test on all the DSP modules in the FPGA chip can be completed simply by means of the MEM module in the FPGA chip.
Owner:SHENZHEN PANGO MICROSYST CO LTD

Method for testing size changing rate of battery diaphragm

The invention aims at providing a method for testing a size changing rate of a battery diaphragm, which can conveniently, quickly and accurately measure the size changing rate of the battery diaphragmand ensure the use safety of a lithium ion battery. The method comprises the following steps: A. intercepting a sample on a diaphragm material to be tested; B. cutting the sample according to a scheduled shape; C. testing the original size of the sample under the condition of the initial environment, and recording the original size; D. testing the scheduled time of the sample which is placed in atest environment; E. taking the sample out of the test environment, carrying out climate adaptation treatment, and measuring a final size; and F. calculating the size changing rate according to the original size and the final size of the tested sample. The method for testing the size changing rate of the battery diaphragm has simple steps and low test condition requirements, can conveniently andquickly test the size changing rate of the battery diaphragm by a comparison test of two environments; in addition, the method adopts a plurality of measures to reduce measuring errors and ensure theaccuracy of test data.
Owner:CHERY AUTOMOBILE CO LTD

Shielding effectiveness measuring method of electric vehicle high-voltage cable

The invention, which belongs to the field of cable detection, relates to a shielding effectiveness measuring method of an electric vehicle high-voltage cable. The invention provides a method for measuring the shielding effectiveness of a high-voltage cable of an electric vehicle based on a network analyzer and a current probe, so that the length requirement on the measured shielding cable by the traditional long-line measurement method is eliminated. Furthermore, the invention provides a matching calculation formula of the shielding effectiveness of the shielding cable based on an actually measured scattering coefficient. Under the condition that impedance matching processing is not carried out on the measured cable and the terminating load, the shielding effectiveness of the cable is accurately measured, so that a problem that the impedance matching condition of shielding effectiveness measurement of the existing electric vehicle high-voltage shielding cable is difficult to meet is solved and the shielding effectiveness measurement difficulty of the shielding cable is reduced.
Owner:CHONGQING UNIV

Method for determining starting time of fiber-optic gyroscope

The invention discloses a method for determining starting time of a fiber-optic gyroscope. The fiber-optic gyroscope is mounted on a fixing base and is kept static, output data of the fiber-optic gyroscope from starting to stably working for a period of time are acquired, and the starting time of the fiber-optic gyroscope can be accurately determined by processing the data. The method is simple to operate and easy to implement, novel criteria for determining the starting time of the fiber-optic gyroscope are provided, and the blank of the existing evaluating technology is filled up.
Owner:ZHEJIANG UNIV

Method for identifying resistance of tobacco to root rot caused by Fusarium tabacinum

The invention discloses a method for identifying the resistance of tobacco to root rot caused by Fusarium tabacinum. The method comprises 1, culture of Fusarium tabacinum, 2, preparation of a Fusariumtabacinum liquid, 3, cultivation of tobacco seedlings, 4, pre-treatment on the tobacco seedlings, 5, inoculation with the Fusarium tabacinum, and 6, investigation to detect the resistance of the specie to the root rot caused by Fusarium tabacinum according to the disease conditions. The identification method can directly identify tobacco seedlings. Compared with the method for inoculation of a pot or a field with bacteria, the method is free of a complex process for pot culture after transplant, reduces work load, utilizes floating plate vaccination to inoculate with hundreds or thousands ofplants, enlarges the inoculation amount, greatly reduces identification time through direct inoculation in the seedling period, breaks the season limitation of the resistance of tobacco to root rot caused by Fusarium tabacinum and realizes identification in any seasons.
Owner:TOBACCO RES INST HENAN ACADEMY OF AGRI SCI

Device and method for testing noise of power capacitor unit

The invention discloses a device and a method for testing the noise of a power capacitor unit. The method comprises the steps of applying a dual-spherical method to rotationally scan for measuring, utilizing a single frequency or a multifrequency for providing a loading harmonic wave to a capacitor to be tested, then utilizing a structure device for measuring the noise of the power capacitor, rotating a microphone used for measuring through the device, transmitting a noise signal acquired by the microphone to a noise tester for carrying out spectral analysis, and finally obtaining a noise parameter through calculated analysis. By using the device provided by the invention, not only can the laboratory cost be greatly saved, but also the required test conditions are relatively simple and easy to maintain, and most importantly, the noise parameter basically approximate to the noise under a real operation condition of the capacitor can be measured, so that a scientific basis is provided for capacitor noise level estimation and treatment.
Owner:CHINA XD ELECTRIC CO LTD

Testing device and method for near-field wave-absorbing material reflectivity

The invention discloses a testing device for near-field wave-absorbing material reflectivity. The device comprises a vector network analyzer which is connected with a coaxial flange clamp through a coaxial cable, the coaxial flange clamp is arranged on a support, a division board is arranged on the top of the coaxial flange clamp, and a sample placing part is arranged between the division board and the coaxial flange clamp. The invention further discloses a testing method of the testing device for the near-field wave-absorbing material reflectivity. The testing device for the near-field wave-absorbing material reflectivity has the advantages that the structure is simple, the manufacturing cost is low, low-frequency range (30 MHz-3 GHz) measurement can be achieved, operation is easy and convenient, the accuracy degree is high, and the repeatability is good.
Owner:HENGDIAN GRP DMEGC MAGNETICS CO LTD

Non-contact heart rate detection method based on BCG principle

The invention discloses a non-contact heart rate detection device based on the BCG principle. An imaging device is fixed on the head of a tested object, and the targeted object keeps the head stationary at any position in any posture for video collection for 30 seconds or more. By tracking any stationary target in the video and processing a signal, the heart rate of the tested object can be obtained under a complex environment, and the accurate non-contact heart rate detection is achieved.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

Static loading device and method for anti-slip test of inclined supporting joint

The invention discloses a static loading device and method for an anti-slip test of an inclined supporting joint. A ground beam is horizontally and fixedly arranged on a test bed, counterforce beams are arranged on the upper part of the ground beam in parallel, and a first side column and a second side column are arranged between the counterforce beams and the ground beam in parallel; the upper end of the first side column is hinged to one end of the counterforce beams, the lower end of the second side column is fixedly connected with the other end of the ground beam, a pressure gauge is arranged between the second side column and a jack, and the upper end of the jack tightly abuts against the other end of the counterforce beams; the lower part of an inclined supporting joint test piece isconnected with the ground beam, and the upper part of the inclined supporting joint test piece is hinged to the counterforce beams; a hinged rotation center between the inclined supporting joint testpiece and the counterforce beams, a hinged rotation center between the first side column and the counterforce beams and the top surface position of the jack are arranged in line. The static loading device is low in manufacturing cost, high in reliability, simple to install, capable of achieving self-balance, simple in operation method in the static loading process, and low in test condition requirement.
Owner:XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY

Remote-control parachuting robot and airdrop test method

The invention discloses a remote-control parachuting robot. The robot comprises a ground transmitter, a receiver, a signal conversion module, a speed regulator, a motor, a hoisting system, a sensor module and a camera module which are mutually connected through wires or cables, wherein a wireless control signal is generated and transmitted by the ground transmitter, the receiver receives the wireless control signal and then sends wireless control signal to the signal conversion module, the signal conversion module completes the digital-to-analog conversion of the signal, and then sends the analog signal to the speed regulator, the speed regulator drives the motor to drive the hoisting system, and a rope in the hoisting system is connected with a control rod of a parachute so as to finally complete the control to the parachute; the sensor module and the camera module carried by the robot collect, record and store relevant data and video information, and then a real-time signal is transmitted to the ground transmitter; an airdrop test method of a remote-control parachuting robot comprises eight main steps. According to the robot disclosed by the invention, the parachute can be operated by a person on the ground in a remote control manner, and an airdrop test of a novel parachute is completed.
Owner:BEIHANG UNIV

Simulation testing device for electrical conductivity of powdery electrode material

The invention discloses a simulation testing device for the electrical conductivity of a powdery electrode material. The simulation testing device comprises an outer barrel body, an inner barrel body, a movable terminal, a cushion block, the powdery electrode material, a fixed terminal, lead wires and a tester, wherein the inner barrel body axially penetrates through the outer barrel body and two ends of the inner barrel body are exposed; one end, which is filled with the fixed terminal, of the inner barrel body is fixedly connected with the outer barrel body, and the other end, which is provided with the movable terminal, of the inner barrel body is in sleeving joint with the outer barrel body. An inner cavity of a middle section of the inner barrel body is filled with the powdery electrode material, and the movable terminal, which is mounted in the inner barrel body, is used for pushing the cushion block to compact the powdery electrode material. Stretching-out ends of the fixed terminal and the movable terminal are connected through the lead wires, and the tester is connected between the two lead wires in series to form a testing loop. The simulation testing device is used for testing the electrical conductivity under a simulation state, and an electrical conductivity relative value close to actual application is easy to obtain; the data of the electrical conductivity of the used powdery electrode material is real and reliable, so that research and development progress of novel products of batteries is facilitated.
Owner:SHUANGDENG GRP

Phase center measurement method of wideband antenna with symmetric main beams

The invention relates to the technical field of the electronic reconnaissance direction-finding application, and discloses a phase center measurement method of a wideband antenna with symmetric main beams. The method comprises the following steps: establishing a two-dimensional orthogonal coordinate so that two beam axes are in a coordinate plane, wherein two beam axes are symmetric about a coordinate axis, and extension lines of two beam axes are intersected at an original point of the coordinate; taking a point C1 on the coordinate axis taking as a symmetric axis, and enabling the point C1 to be located at a far field area of each of two antennas; placing a radiation source with frequency as f0 at the point C1, and measuring phase difference phi1 of a receiving signal; moving the radiation source located at the point C1 to a C2 point along a direction vertical to the located coordinate axis in a coordinate plane, and computing the phase difference change value phi0 after moving the radiation source to the C2 point from the C1 point; and computing the coordinate location of the phase center of the measured antenna according to the phase difference change value phi0. The method disclosed by the invention is free from using a rotary table and like equipment, a testing condition requirement is low, the testing step is concise, the testing efficiency is high, and a new testing path is provided for the phase center measurement of the wideband antenna commonly used in the electronic reconnaissance.
Owner:SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP

Test device for friction resistance between non-smooth surface and solid wall surface

The invention discloses a test device for friction resistance between a non-smooth surface and a solid wall surface, and relates to a resistance test device. The test device comprises a test base, a first test installation area and a second test installation area, wherein the first test installation area and the second test installation area are sequentially arranged on the test base; the first test installation area comprises a power transmission device; the power transmission device comprises a driving device and a torque measuring device; the driving device is in driving connection with thetorque measuring device; the second test installation area comprises a pressing device and a moving device; the power transmission device is coaxially connected to the pressing device; the pressing device is installed on the moving device; and the moving device is movably connected with the test base. The test device is multifunctional, small in occupied area, low in cost, convenient to operate and easy to disassemble.
Owner:ZHEJIANG UNIV OF TECH

Portable restrictive double-sided shear strength test clamp and test method

The invention belongs to the technical field of geotechnical engineering tests, and discloses a portable restrictive double-sided shear strength test clamp and test method. The test clamp comprises aclamp body, a shear block, two hinge brackets and two side pressure plates; a shearing groove penetrating the upper surface and the lower surface is formed in the clamp body in the vertical direction,a test piece groove which horizontally extends towards the rear end face and does not penetrate through the clamp body is formed in the front end face, the two side pressure plates are symmetricallyarranged on the two sides of the test piece groove, universal heads are fixedly arranged in the outer sides of the side pressure plates respectively, spherical cavities are formed in the universal heads, and small steering balls capable of rotating along the inner walls of the spherical cavities are arranged in the spherical cavities; the two hinge brackets are symmetrically arranged in the two sides of the clamp body; and the shear block is arranged in the shearing groove. The test clamp is simple in structure, the variable can be controlled only by replacing a test piece and a weight in thetest process, the test process is effectively simplified, and the test cost is greatly reduced.
Owner:TAIYUAN UNIV OF TECH

Method for measuring crust amine and chitin content in crust amine fibre and cotton blending product

The invention discloses a chitosan and chitin content measurement method in the chitosan fiber and cotton blended products. Acetic acid solution is used to separate the chitosan fiber on the blended product, and the chitosan content in the dissolved solution is measured through colloidal titration so as to obtain the chitosan content in the chitosan fiber and the cotton blended product; the chitosan fiber and the cotton blended product are treated with a sufficient amount of concentrated alkali to enable the chitin in the chitosan fiber to be fully converted into chitosan; then the chitosan content in the chitosan fiber and the cotton blended product after alkali treatment is measured according to the method for measuring the chitosan, and the chitosan content in the chitosan fiber and the cotton blended product is deducted from the measured chitosan content so as to obtain the chitin content in the chitosan fiber and the cotton blended product. The chitosan and chitin content measurement method has high measurement precision and accuracy, small toxicity of the reagent, less environmental pollution and easy operation, which provides a convenient, scientific and feasible detectionmethod for the vast number of small and medium-sized enterprises and primary inspection agencies.
Owner:天奇智联(杭州)实业有限公司 +1

Canine distemper virus drying type real-time fluorescence PCR detection reagent

The invention discloses a canine distemper virus drying type real-time fluorescence PCR detection reagent, and belongs to the technical field of detection reagents. A method comprises the following steps: a, product specification and kit components; b, reagent preparation (carried out in a reagent preparation area); c, sample treatment and sample addition (carried out in a sample treatment area);d, PCR detection (carried out in a nucleic acid amplification region); and e, result analysis and determination. A sample is detected to be positive or negative by collecting fluorescence signals, theefficiency is high, operation is easy, the detection result needs to meet the necessary conditions, the characteristics of low cost, convenience, rapidness and low test condition requirement are achieved, the detection efficiency is improved, and the detection accuracy is also ensured.
Owner:深圳市慧思基因科技有限公司

Perovskite film morphology structure detection method based on digital holography

The invention discloses a perovskite film morphology structure detection method based on digital holography, and belongs to the technical field of perovskite film production and detection. According to the method, a laser device, an objective lens, a small hole, a collimating lens, a beam splitter prism, a reflector, a microscope objective lens, a heatable carrier, a beam combiner prism, a CCD camera and a computer are included. The method comprises the steps: respectively placing perovskite films in a transmission-type or reflection-type holographic light path by using a digital holographic technology, shooting different regions of the perovskite films at normal temperature for multiple times with the heated perovskite films, and acquiring holograms by using a CCD; and processing and analyzing the phase information obtained by the holograms to judge the morphology structure condition and the stability of the perovskite films.
Owner:KUNMING UNIV OF SCI & TECH

Method for determining ammonia nitrogen content in seawater by Nessler's reagent spectrophotometry

The invention provides a method for determining ammonia nitrogen content in seawater by Nessler's reagent spectrophotometry. According to the method, the optimal addition amount of sodium potassium tartrate in a wide salinity range is found out by adjusting the concentration and volume of sodium potassium tartrate according to the salinity of a sample to be detected, that is, the interference of impurity ions such as Ca 2+, Mg 2+, Fe 2+ and Mn 2+ in the seawater sample can be eliminated only by using a sodium potassium tartrate solution as a masking agent, so that the Nessler reagent in the seawater is more stable in color development, and the method is wider in application range. According to the method, reagents such as sodium hydroxide are not needed as masking assistance, and the dosages of the potassium sodium tartrate and the Nessler reagent are less, so that the environmental pollution is reduced, and the cost is saved; besides, the method has the advantages of less interference, simplicity in operation, high speed, high recovery rate, good precision and the like.
Owner:HAINAN UNIVERSITY

Method for assessing fullerene C60 contamination in sludge improved soil

The invention relates to a soil utilization process of sludge, a method for assessing fullerene C60 contamination in sludge improved soil. The method mainly comprises the following steps: performing air drying, smashing and screening for the soil subjected to sludge improvement, orderly using ultrapure water and methylbenzene to perform vibrating extraction for the C60, testing concentration of the C60 through an ultraviolet spectrophotometer, wherein the concentration is used for assessing degree of being contaminated by the C60 of a tested soil sample. The test method is systematic and complete, and the method only relates to common instruments and medicines and is convenient for detection and relatively low-cost.
Owner:TIANJIN UNIV

A Test Method for Seebeck Coefficient of Thermoelectric Materials

The invention discloses a method for testing a Seebeck coefficient of a thermoelectric material. The method integrates characteristics of a steady state method and a dynamic method, and mainly comprises the following steps: I, according to a dynamic testing method, keeping the temperature of a low-temperature end of a sample generally unchanged, rapidly increasing the temperature of a high-temperature end, recording a temperature difference delta T and a potential difference delta U of two ends in real time, and performing linear fitting delta U and delta T into the relationship that delta U=alpha 1*delta T+delta u; II, according to the equation, when delta T=0, acquiring delta U deviation, or when delta U=0, acquiring delta T deviation, and determining the two values as system errors; III, when keeping the average temperature T0 of the sample the temperature difference of two ends unchanged within 5-10K, respectively testing a potential difference delta U0 and a temperature difference delta T0 by using the steady state testing method, and according to an equation that alpha reality=delta U0 / delta T0-delta T deviation=delta U0-delta U deviation / delta T0, introducing delta U deviation or delta T deviation, thereby obtaining alpha reality. By adopting the method, precise testing on the Seebeck coefficient is achieved, system errors introduced in the testing process are eliminated, testing condition requirements are reduced, and very great learning significances can be achieved for making and optimization of data acquisition and processing modes of self-developed, to be developed and conventional commercial equipment.
Owner:HEFEI UNIV OF TECH

Quick judgement method and quick detection method for usability of natural discharging manganese powder for zinc-manganese battery

The invention provides a judgment method for usability of natural discharging manganese powder. The method comprises the following steps of firstly, mixing the natural discharging manganese powder anda ZnCl2-NH4Cl solution, and afterwards, conducting filtering to obtain a filtrate; putting zinc sheets into the filtrate obtained in the last step, heating the filtrate until the filtrate is boiled,and obtaining the zinc sheets with surface properties; finally, according to the surface properties of the zinc sheets, judging the usability of the natural discharging manganese powder. The judgmentmethod for the usability of the natural discharging manganese powder is very simple and quick, low in cost and capable of quickly judging the content of harmful heavy metal impurities in the natural discharging manganese powder, so that whether or not the natural discharging manganese powder can be used for battery production is judged. According to the judgement method, judgement is made according to the surface properties of the treated zinc sheets, the content of the harmful heavy metal impurities in the natural discharging manganese powder can be comprehensively judged, the method is simple and effective, the result can be given at the day of feeding, the requirement for test conditions is low, guide production and industrial application and popularization are facilitated, and the method has important practical significance.
Owner:SICHUAN HUAJING GUOMAO INDAL

A method of testing the initial position angle of motor rotor

ActiveCN106787995BThere is no problem with the convergence of test resultsSimple on-site operationVector control systemsElectronic commutatorsElectric machineTerminal voltage
The invention discloses a method for testing the initial position angle of a motor rotor, which solves the technical problems of high requirements for testing conditions for the initial position angle of the motor rotor and difficult actual operation in the prior art. The method includes the following steps: Step 1, firstly, a current i is given to the motor to be tested to make the motor run; Step 2, after the motor runs, the current i is set to zero, that is, i d =0 and i q =0; Step 3, read the voltage u of the motor stator d-axis and q-axis in the converter at this time d , u q ; Step 4, according to u d , u q The trigonometric function relationship between the calculation obtains the initial position angle deviation θ of the motor rotor err . The invention uses the d-axis and q-axis voltages of the motor stator to directly calculate the initial position angle deviation of the motor rotor; the corresponding relationship between the motor terminal voltage and the initial rotor position angle in the motor controller is clarified; the method is simple and suitable for engineering field operations; Fault diagnosis and error correction control to improve system functional safety.
Owner:JING JIN ELECTRIC TECH HEZE CO LTD
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