At 19:41 on April 20, the Tianzhou spacecraft successfully launched and launched a fast intersection test with Tiangong-2. What is the key point of successful docking and docking? I believe you will understand after reading this article.
The motor test system is an effective device for detecting the performance of motors and drives. Today, with the wave of new energy vehicles and servo robots, major new energy vehicle manufacturers and servo robot testing organizations have begun to have higher motor and drive test systems. demand. An excellent test system is of course a persistent pursuit of its details. However, many test engineers are always getting the most of the motor alignment when using the test system. Don't underestimate the "small things" in the motor alignment. Today, we will take a peek at the big, and look at the secrets of the docking of the Tianzhou from the center of the motor.
What is the risk of misalignment of the motor test system? Misalignment means that the rotor axis of the motor is not in line with the axis of the connecting shaft. The misalignment is divided into two types. One is parallel misalignment and the other is angular misalignment. as the picture shows. If the shaft is misaligned, there will be force at the coupling of the shaft, and the bearing will be damaged prematurely. In addition, the shaft will increase the friction of the coupling, which will significantly reduce the energy efficiency of the machine. To a large impact, operating costs increase.
figure 1
In general, the motor test system shaft misalignment has the following hazards:
· Longitudinal stress will cause periodic large vibrations in the axial and radial directions of the bearing, greatly shortening the life of the coupling;
· causing damage to the electrical components inside the motor;
· Excitation stress caused by poor motor alignment will cause the motor operating current to rise and the effective output mechanical power to drop. The increase of the working current will cause an increase in the heating of the motor, and the temperature rise of the motor will increase, thereby affecting the normal working state of the motor;
· The torque fluctuation test data is not accurate.
figure 2
Since the accuracy of the alignment will cause such a big hazard, how to check the alignment of your gantry, here are two ways to introduce the alignment.
Dial indicatorThe dial gauge is in contact with the surface of the motor shaft through the rod, and the transmission gear in the table amplifies the relative movement of the rod to measure the positional deviation between the two shafts. Commonly used methods are the outer ring end method and the reverse outer circle method. The measurement is shown as follows:
Figure 3 Dialect method
The dial gauge alignment method can be said to be the exclusive skill of the “old driverâ€. The experience of the operator in this method is very high. The dial gauge can only tell you the deviation between the axes, and will not tell Which direction should you go to adjust? This is also very laborious for novices.
Laser alignment instrumentIf you want to achieve a fool-like alignment, then you have to buy a laser alignment device. This is much simpler than the dial gauge. It is installed on the two axes that need to be centered. The measuring device capable of transmitting and receiving the laser beam, taking advantage of the good linearity of the laser, plus the automatic acquisition, calculation and processing capability of the data in the centering system, displays the real-time centering deviation on the data terminal and gives adjustment Suggest. In summary, the characteristics of the laser alignment instrument are:
· The excellent linearity of the laser eliminates the influence of the deflection of the bracket and the probe on the measurement accuracy when the dial gauge is centered;
· Powerful data acquisition and processing capability and excellent human-computer interaction interface, which can display the deviation data of the axis alignment on the terminal with a graphical interface, and give adjustment suggestions, reducing the dependence on artificial experience;
· Accuracy of up to 0.001mm greatly improves alignment accuracy and reliability;
· Significantly improved alignment efficiency.
Figure 4 Laser alignment instrument
Figure 5 Laser alignment guide
After reading this article, I think you already know the key to the success of the docking of Tianzhou and Tiangong. The so-called details determine the success or failure, the successful docking of the Tianzhou cargo spacecraft and the Tiangong-2 is also the result of numerous pursuits of perfect details by Chinese astronauts.
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