CN213633740U - Novel rotating electrical machines characteristic test rack - Google Patents
Novel rotating electrical machines characteristic test rack Download PDFInfo
- Publication number
- CN213633740U CN213633740U CN202022537493.6U CN202022537493U CN213633740U CN 213633740 U CN213633740 U CN 213633740U CN 202022537493 U CN202022537493 U CN 202022537493U CN 213633740 U CN213633740 U CN 213633740U
- Authority
- CN
- China
- Prior art keywords
- motor
- module
- test
- surveyed
- load
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The utility model discloses a novel rotating electrical machines characteristic test rack, including damping platform and switch board, be provided with load motor and the motor under test on the damping platform, be provided with moment of torsion tachometric sensor between load motor and the motor under test, load motor passes through the wire simultaneously with the motor under test and connects on same two way power supply, moment of torsion tachometric sensor signal connection is on the switch board. The utility model discloses to be surveyed the motor and all set up on the damping platform with load motor, two-way power supply is supplied power to load motor and being surveyed the motor, can provide the test environment of four quadrants for the two, load motor provides rotational speed and moment of torsion for being surveyed the motor, then torque and speed sensor sets up between the two, can gather the loading condition of being surveyed the motor, torque and speed sensor signal connection is on the switch board, then the staff can the remote control test, test the test characteristic of being surveyed the motor under the different operating modes.
Description
Technical Field
The utility model relates to a rotating electrical machines characteristic test equipment field, concretely relates to novel rotating electrical machines characteristic test rack.
Background
In recent years, with the rapid development of intelligent manufacturing and new energy electric vehicles, the wide application of motor characteristic testing technology in various manufacturing and control systems is promoted, and at the same time, higher and higher requirements on motor performance and quality indexes are put forward.
The traditional test equipment and method mostly adopt a manual reading test mode, have long operation time and low efficiency, have certain test danger, and have difficulty in ensuring the test precision and the response speed. The traditional test equipment can only carry out a torque and rotating speed test, a temperature rise characteristic test and a locked rotor characteristic test, but cannot test the control of the tested motor; therefore, it is necessary to research a fast, real-time, comprehensive and reliable rotating electrical machine characteristic testing system to reduce the testing time cost and improve the testing efficiency.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims at providing a novel rotating electrical machines characteristic test rack, can effectively solve traditional test equipment test danger among the background art, efficiency of software testing is low, and can not carry out the problem tested to the control of being surveyed the motor.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
the utility model provides a novel rotating electrical machines characteristic test rack, includes damping platform and switch board, be provided with load motor and the motor under test on the damping platform, be provided with torque speed sensor between load motor and the motor under test, torque speed sensor's the coaxial fixed connection of output on one end is passed through first shaft coupling and the motor under test, torque speed sensor's the other end passes through second shaft coupling and the coaxial fixed connection of load motor, the load motor passes through the wire simultaneously with the motor under test and connects on same two-way power supply, torque speed sensor signal connection is on the switch board.
Preferably, be connected with load motor drive through the wire between bidirectional power source and the load motor, be connected with the motor drive under test through the wire between bidirectional power source and the motor under test, be provided with the measurement and control module in the switch board, the measurement and control module passes through the wire with software module and is connected, signal connection between measurement and control module and load motor drive, the motor drive under test, still be provided with digital signal switching module between load motor drive and the measurement and control module, digital signal switching module is used for changing the signal, measurement and control module and test result output module electric connection.
Preferably, the test result output module is arranged in an upper computer, and a user setting module and a secondary development interface module are further arranged in the upper computer.
Preferably, the motor to be tested is provided with a first encoder, the first encoder is electrically connected to a driver of the motor to be tested, the load motor is provided with a second encoder, and the second encoder is electrically connected to the digital signal switching module.
Preferably, still include the temperature recorder, the temperature recorder is with installing the temperature sensor electric connection on the motor that is surveyed, temperature recorder electric connection is on being surveyed motor drive and with observing and controlling module signal connection.
Preferably, the power analysis device further comprises a power analyzer, wherein the power analyzer is electrically connected between the tested motor and the bidirectional power supply through a lead, and the power analyzer is powered by direct current or alternating current.
Preferably, still include noise monitoring module, noise monitoring module is relative with the motor under test, noise monitoring module signal connection is on observing and controlling the module.
Preferably, the water cooling device further comprises a water cooling machine, and a water outlet of the water cooling machine is communicated with a cooling water tank of the load motor through a pipeline.
The utility model provides a novel rotating electrical machines characteristic test rack possesses following beneficial effect:
1. the utility model can realize remote real-time on-line test, and avoid the body injury to the tester during the manual test on site;
2. the utility model discloses not only can test conventional test item, like load characteristic, T-N curve, no-load characteristic, B method efficiency, just counter-rotating speed difference, the temperature rise test, continuous locked rotor data, peak value locked rotor data, back electromotive force constant, electric time constant, thermal resistance and thermal time constant, current overload multiple, static rigidity etc. can also test the relevant test of control accuracy such as rotational speed fluctuation, torque fluctuation, rotational speed rate of adjustment experiment, position tracking error and rotational speed change time response, torque change time response, electromechanical time constant, the corresponding relevant experiment of control such as frequency band width experiment;
3. the utility model discloses a observe and control module that sets up in the switch board can carry out dynamic loading, is convenient for imbed automatic characteristic test and set up specific operating mode, and the iteration provides probably for the upgrading of test item.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic diagram of the present invention;
in the figure: 1. a vibration reduction platform; 2. a load motor; 3. a motor to be tested; 4. a torque speed sensor; 5. a first coupling; 6. a second coupling; 7. a bi-directional power supply; 8. a load motor driver; 9. a motor driver to be tested; 10. a measurement and control module; 11. a digital signal switching module; 12. a test result output module; 13. a first encoder; 14. a second encoder; 15. a temperature recorder; 16. a power analyzer; 17. a noise monitoring module; 18. a water cooling machine; 19. the system comprises a user setting module and a secondary development interface module; 20. a software module; 21. and (4) an upper computer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention will be combined to clearly and completely describe the technical solutions in the embodiments of the present invention. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
The embodiment I, a novel rotating electrical machines characteristic test rack, including damping platform 1 and switch board, be provided with load motor 2 and measured motor 3 on the damping platform 1, be provided with torque speed sensor 4 between load motor 2 and the measured motor 3, torque speed sensor 4's one end is through the coaxial fixed connection of output on first shaft coupling 5 and the measured motor 3, torque speed sensor 4's the other end passes through the coaxial fixed connection of second shaft coupling 6 and load motor 2, load motor 2 passes through the wire simultaneously with measured motor 3 and connects on same two way power supply 7, torque speed sensor 4 signal connection is on the switch board.
The hardness of the workbench of the vibration reduction platform 1 is more than HB170-240, and the vibration reduction platform has better plane stability, toughness and wear resistance; the spring vibration isolation device is adopted, so that vibration can be isolated, secondary noise of the structure can be isolated, and the horizontal and vertical inherent frequencies of the test bed or the test equipment can be accurately calculated. The vertical natural frequency of the system can be designed to be 1Hz at the lowest, and at the moment, the natural frequency of the horizontal vibration and the swinging vibration can be even lower than 1Hz, and the precision level is 3.
The load motor 2 provides a load environment for the tested motor 3, and the torque of the load motor can cover the range of the tested motor 3 to meet the torque index required to be tested by the tested motor 3; and a rotating speed environment is provided for the tested motor 3, the rotating speed of the rotating speed environment can cover the range of the tested motor 3, and the rotating speed environment required to be tested of the tested motor 3 is met. The bidirectional power supply 7 provides a four-quadrant test environment for the load motor 2 and the tested motor 3, and also provides a power source as a platform.
The working principle is as follows: the motor 3 to be tested and the load motor 2 are both arranged on the vibration reduction platform 1, the bidirectional power supply 7 supplies power to the load motor 2 and the motor 3 to be tested, four-quadrant testing environment can be provided for the two motors, two ends of the torque and speed sensor 4 are respectively fixedly connected with the motor 3 to be tested and the load motor 2 through the first coupler 5 and the second coupler 6, the load motor 2 provides rotating speed and torque for the motor 3 to be tested, the torque and speed sensor 4 is arranged between the two motors, the loading condition of the motor 3 to be tested can be collected, conversion efficiency of mechanical output power and electric power of the power analyzer 16 can be achieved, the torque and speed sensor 4 is in signal connection with the control cabinet, a worker can remotely control testing, and testing characteristics of the motor 3 to be tested under different working conditions are tested.
Be connected with load motor driver 8 through the wire between two-way power supply 7 and the load motor 2, be connected with between two-way power supply 7 and the motor 3 under test through the wire and be surveyed motor driver 9, be provided with measurement and control module 10 in the switch board, measurement and control module 10 passes through the wire with software module 20 and is connected, measurement and control module 10 and load motor driver 8, signal connection between the motor driver 9 under test, still be provided with digital signal switching module 11 between load motor driver 8 and the measurement and control module 10, digital signal switching module 11 is used for converting the signal, measurement and control module 10 and test result output module 12 electric connection. The measurement and control module 10 is connected with the software module 20, the software module 20 can be self-programming software, and can also be an external software program, and the measurement and control module 10 can load a bottom program of the measurement and control software and perform calculation.
The load motor driver 8 can adopt Unitech SD800 series, can drive the load motor 2 to provide a test environment for the tested motor 3 in a torque mode and a rotating speed mode, and drives the tested motor 3 to realize test experiments such as testing, overspeed, torque, rotating speed response and the like; meanwhile, the load motor driver 8 provides a bottom layer PWM open source interface, and provides a hardware basis for secondary development of a user; a high-frequency PWM hardware structure of SiC is adopted, so that a hardware premise is provided for setting accurate rotating speed and loading environment; an open source driver is adopted to provide an open source hardware basis for the design of a controller of the tested motor driver 9; the tested motor driver 9 adopts a SiC open source structure, and provides a wider hardware environment for the design of the controller.
The test result output module 12 is arranged in the upper computer 21, and the upper computer 21 is also internally provided with a user setting module and a secondary development interface module 19. The test result output module 12 can present a motor characteristic test result, the result is in a document form and is interconnected with the printer, editing and printing are completed by one key, the test result comprises information such as a data report, a curve graph, a text description, specification parameters, test time and the like, the test result output module 12 outputs the data, and the upper computer 21 can further transmit the data to an external data storage and processing module, so that the characteristic of the rotating motor is further analyzed.
The user setting module and the secondary development interface module 19 arranged in the upper computer 21 can further increase test items, and meanwhile, the setting of a user can be facilitated, so that the operation of a tester is facilitated when a new function is added. The user setting module and the secondary development interface module 19 adopt Caps-mk-004 series of Unitech, and the upper computer 21 functionally mainly comprises data display, transmission and storage functions. The data display comprises real-time numerical values, real-time curves and the like, the numerical values can be set into forms of tables, lists and the like, and the curves can be set with display step length, different variable comparison modes, color line types and the like; the instruction issuing comprises the forms of real-time numerical value adjustment, curve variable adjustment, trigger judgment type modification, curve dragging and the like; the data storage comprises the forms of measurement cache storage, Plotter display data storage, long-time recorder storage and the like. In operation, the sdf file of the simulink can be updated in real time, all intermediate variables of the controller in the simulink are connected, and the sdf files of different algorithms can be replaced quickly.
The digital signal switching module 11 is adapted to a servo driving device and used for protecting a DIO digital signal channel of the measurement and control module 10 from being damaged due to external connection, so that long-term after-sale maintenance time is avoided; the mode of customizing hardware dead zone setting is adopted to save channels for the measurement and control module 10, reduce the set range of software dead zones, adapt to more motor types and increase the diversity of motor control modes.
In this embodiment, the motor 3 to be tested is provided with a first encoder 13, the first encoder 13 is electrically connected to the motor driver 9 to be tested, the load motor 2 is provided with a second encoder 14, and the second encoder 14 is electrically connected to the digital signal switching module 11. The digital signal switching module 11 adopts digital signal processing methods such as isolation optimization to improve the stability and the immunity of high-precision digital signals such as the first encoder 13, the second encoder 14 and the like. The first encoder 13 is used to provide an angular output for the motor 3 under test. The second encoder 14 usually adopts an absolute SSI high-precision encoder for providing high-precision angle output for the load motor 2 and accurately positioning the position control of the tested motor 3 under the condition of load. The second encoder 14 is electrically connected to the digital signal switching module 11, so that the control channel can be saved.
Still include temperature recorder 15, temperature recorder 15 and the temperature sensor electric connection who installs on being surveyed motor 3, 15 electric connection of temperature recorder are on being surveyed motor driver 9 and with observing and controlling module 10 signal connection, embedded KTY and temperature probe in being surveyed motor 3, access temperature recorder 15, temperature recorder 15 transmits temperature information to observing and controlling module 10 in real time through RS485 to show in real time and record on test result output module 12.
The power analysis device further comprises a power analyzer 16, the power analyzer 16 is electrically connected between the tested motor 3 and the bidirectional power supply 7 through a lead, and the power analyzer 16 is powered by direct current or alternating current. The power analyzer 16 can transmit the signal to the measurement and control module 10 in real time via the ethernet, and display and record the signal in real time at the test result output module 12.
The motor noise monitoring device is characterized by further comprising a noise monitoring module 17, wherein the noise monitoring module 17 is opposite to the motor to be detected 3, and the noise monitoring module 17 is in signal connection with the measurement and control module 10. The sound level meter used by the unit adopts the Aihua AWA5636-0, and the module is used for monitoring the noise of the tested motor 3 under different working conditions in real time; freely measuring the noise intensity of different areas around the tested motor 3; acquiring the noise condition of the system in real time at the measurement and control module 10; providing environmental noise parameters for noise indexes designed and controlled by the tested motor 3, thereby facilitating continuous correction; and is interconnected with the test result output module 12 unit to present a test report.
The water cooling device further comprises a water cooling machine 18, and a water outlet of the water cooling machine 18 is communicated with a cooling water tank of the load motor 2 through a pipeline. The water inlet and the water outlet of the water cooling machine 18 are connected with the water outlet and the water inlet of the shell of the load motor 2, so that a water circulation structure is formed, the load motor 2 is continuously cooled, and the stable operation of the dynamometer platform is facilitated.
To sum up, the measurement and control module 10 collects the voltage and current signals of the servo driving device, the digital signals transferred by the digital signal transfer module 11, the RS485 communication signals of the power analyzer 16, the analog voltage signals of the equipment in the noise monitoring module and the RS485 communication signals of the temperature recorder 15; the digital signal switching module is used for switching the digital signal to be transmitted; the system is used for loading a bottom program of the measurement and control software and calculating; the test result output module 12 is used for being connected with the upper computer 21 through the Ethernet so that the upper computer 21 can output the test result; and the hardware carrier is used for providing a corresponding hardware carrier for the user setting and secondary development interface module.
When the four-quadrant loading test is carried out, the load motor 2 or the tested motor 3 CAN obtain mechanical energy through a mechanical shaft and convert the mechanical energy into electric energy to operate in a power generation mode, a torque sensor in the process CAN obtain a real-time torque signal and transmit the real-time torque signal to the measurement and control module 10, the electric energy sent by the load motor 2 or the tested motor 3 CAN pass through the load motor driver 8 or the tested motor driver 9 to be transmitted to the measurement and control module 10, the test result output module 12 is opened on the upper computer 21 for real-time measurement and control, the measurement and control module 10 transmits an instruction to the tested motor 3 through a CAN (controller area network) protocol to enable the tested motor 3 to operate in a specific test working condition mode, current signals collected by the load motor driver 8 are collected, and the signals are transmitted to the load motor driver 8 through the digital signal switching module 11, so as to meet the experimental environment requirements of a test item, when the four-quadrant loading test is carried out, the load motor 2 or the tested The converted direct current form is absorbed on the bidirectional power supply 7, and the direct current voltages of the load motor driver 8 and the tested motor driver 9 are stabilized by the bidirectional power supply 7;
in the operation test process, the mechanical power of the tested motor 3 is obtained by calculating a torque signal and a rotating speed signal of a torque sensor, the electric power of the tested motor 3 is obtained by calculating after acquiring an alternating voltage and current signal by a power analyzer 16, meanwhile, the direct current side of a tested motor driver 9 is connected into the power analyzer 16 to obtain a direct current side voltage and current signal and direct current side power, so that the efficiency of the tested motor 3 and the efficiency of the driver can be obtained, the power analyzer 16 can transmit the signal to the measurement and control module 10 in real time through the Ethernet, and the signal is displayed and recorded in real time in the test result output module 12.
The tested motor 3 is embedded with a temperature sensor, the output signal of the temperature sensor is connected to a temperature recorder 15, the temperature information of each embedded point can be displayed in real time, the temperature recorder 15 transmits the temperature information to the measurement and control module 10 in real time through RS485, and the temperature information is displayed and recorded in real time on the test result output module 12; the noise monitoring module 17 is placed beside the tested motor 3, can freely move, outputs analog quantity voltage signals, can be connected into the measurement and control module 10, and displays and records the analog quantity voltage signals on the test result output module 12 of the upper computer 21 in real time.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; the pattern filling in the drawings of the utility model does not represent the material of the structure, and only distinguishes the structure; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (8)
1. The utility model provides a novel rotating electrical machines characteristic test rack which characterized in that: including damping platform and switch board, be provided with load motor and the motor that is surveyed on the damping platform, be provided with moment of torsion speed sensor between load motor and the motor that is surveyed, the one end of moment of torsion speed sensor is through the coaxial fixed connection of output on first shaft coupling and the motor that is surveyed, moment of torsion speed sensor's the other end passes through the coaxial fixed connection of second shaft coupling and load motor, the load motor passes through the wire simultaneously with the motor that is surveyed and connects on same two-way power supply, moment of torsion speed sensor signal connection is on the switch board.
2. The novel rotating electrical machine characteristic test bench of claim 1, wherein: be connected with load motor drive through the wire between bidirectional power source and the load motor, be connected with through the wire between bidirectional power source and the measured motor and be measured motor drive, be provided with the measurement and control module in the switch board, the measurement and control module passes through the wire with software module and is connected, signal connection between measurement and control module and load motor drive, the measured motor drive, still be provided with digital signal switching module between load motor drive and the measurement and control module, digital signal switching module is used for changing the signal, measurement and control module and test result output module electric connection.
3. The novel rotating electrical machine characteristic test bench of claim 2, wherein: the test result output module is arranged in an upper computer, and a user setting module and a secondary development interface module are also arranged in the upper computer.
4. The novel rotating electrical machine characteristic test bench of claim 2, wherein: the motor to be tested is provided with a first encoder which is electrically connected to a driver of the motor to be tested, the load motor is provided with a second encoder which is electrically connected to the digital signal switching module.
5. The novel rotating electrical machine characteristic test bench of claim 2, wherein: still include the temperature recorder, the temperature recorder is with installing the temperature sensor electric connection on being surveyed the motor, temperature recorder electric connection is on being surveyed motor drive and with observing and controlling module signal connection.
6. The novel rotating electrical machine characteristic test bench of claim 2, wherein: the power analysis device is characterized by further comprising a power analyzer, wherein the power analyzer is electrically connected between the tested motor and the bidirectional power supply through a lead, and the power analyzer is powered by direct current or alternating current.
7. The novel rotating electrical machine characteristic test bench of claim 2, wherein: still include noise monitoring module, noise monitoring module is relative with the motor under test, noise monitoring module signal connection is on observing and controling the module.
8. The novel rotating electrical machine characteristic test bench of claim 1, wherein: the water cooling device is characterized by further comprising a water cooling machine, wherein a water outlet of the water cooling machine is communicated with a cooling water tank of the load motor through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022537493.6U CN213633740U (en) | 2020-11-05 | 2020-11-05 | Novel rotating electrical machines characteristic test rack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022537493.6U CN213633740U (en) | 2020-11-05 | 2020-11-05 | Novel rotating electrical machines characteristic test rack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213633740U true CN213633740U (en) | 2021-07-06 |
Family
ID=76630350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022537493.6U Active CN213633740U (en) | 2020-11-05 | 2020-11-05 | Novel rotating electrical machines characteristic test rack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213633740U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327159A (en) * | 2020-11-05 | 2021-02-05 | 商飞信息科技（上海）有限公司 | Novel rotating electrical machines characteristic test rack |
-
2020
- 2020-11-05 CN CN202022537493.6U patent/CN213633740U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327159A (en) * | 2020-11-05 | 2021-02-05 | 商飞信息科技（上海）有限公司 | Novel rotating electrical machines characteristic test rack |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112327159A (en) | Novel rotating electrical machines characteristic test rack | |
| CN204495970U (en) | Energy-saving of motor system test platform | |
| CN110907823A (en) | Real-time acquisition system and method for servo motor test data | |
| CN105571648B (en) | A kind of multi-function robot joint Performance Test System | |
| CN109445324B (en) | Control system and control method for motor and reducer integrated test | |
| CN213633740U (en) | Novel rotating electrical machines characteristic test rack | |
| CN108414834B (en) | Performance comprehensive testing device of wind power variable-pitch slip ring | |
| CN102288912A (en) | Tension-torsion mechanical separation mechanism and electric power system testing platform capable of being used for unmanned plane and model airplane design | |
| CN205403838U (en) | Multifunctional robot joint capability test system | |
| CN105547675A (en) | Car remote control key service life test system and method thereof | |
| CN205120329U (en) | Novel electronic servo -type unipolar exciter test platform | |
| CN103278263A (en) | Intelligent verification system of pressure type thermometers | |
| CN103759870B (en) | A kind of measuring method for intermittent work device output power value and system | |
| CN2476020Y (en) | Detector for testing coefficient of heat transfer | |
| CN209148845U (en) | A kind of driving control system for electric machine efficiency Detecting data frame based on power control | |
| CN102331444B (en) | Device for automatically testing aging performance and thermal time constant of thermistor | |
| CN214584038U (en) | System based on engine performance test | |
| CN110531302A (en) | Intelligent electric energy meter failure mechanism and condition monitoring system and method | |
| CN106767635A (en) | A kind of method for calibrating spring chi and its measurement tree-walk | |
| CN207067355U (en) | A kind of intelligent electric machine performance test apparatus | |
| CN203323920U (en) | Intelligent verification system for pressure-type thermometer | |
| CN109323984A (en) | The micro- damage of one kind pierces resistance measurement system | |
| CN103792254B (en) | High precision temperature control pilot system for thermo-resistance measurement | |
| CN104089705A (en) | Rocker type multipoint crop canopy infrared temperature detection system and method | |
| CN213633739U (en) | Linear electric motor characteristic test rack |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |