China News Service, Nanjing, November 24 (Wang Wei and Xu Shanshan) In the early morning of the 24th, the Long March 5 carrier rocket and the Chang'e 5 lunar probe were launched in Wenchang, starting the "earth-digging" journey of lunar exploration.
According to news from Nanjing University of Aeronautics and Astronautics on the 24th, the ultrasonic motor developed by the team of Academician Zhao Chunsheng of the school was applied to the Chang'e-5 detector this time for the drive and control of the spectrometer.
Data map: At 4:30 on November 24th, China successfully launched the lunar exploration project Chang'e 5 probe with the Long March 5 Yaowu carrier rocket at the Wenchang Space Launch Site. The rocket flew for about 2,200 seconds and sent the probe smoothly. Entering the predetermined orbit, starting China's first return journey for sampling of extraterrestrial objects.
Photo by China News Agency reporter Luo Yunfei
Compared with traditional motors, ultrasonic motors have the advantages of fast response, high precision, low noise, and no electromagnetic interference. Previously, the ultrasonic motors of the team of Academician Zhao Chunsheng have been successfully applied to the Chang'e 3 and 4 detectors. Played an important role in the project.
When the ultrasonic motor was applied to the Chang'e 3 and 4 detectors, it was only a preliminary application in the lunar exploration project. It was mainly responsible for the drive and control of the calibration board in the infrared imaging spectrometer, and its function was similar to the "door switch" of the spectrometer.
The "Chang'e 5" has more stringent requirements on the accuracy and environment of the ultrasonic motor. "Chang'e 5" will sample the lunar soil, and the ultrasonic motor will be used to control the direction and angle of the mirror surface of the spectrometer that receives the reflected spectrum. .
The operating temperature range of the ultrasonic motor in the early Chang'e mission was -30°C to 60°C. The operating temperature range of the "Chang'e-5" was expanded to -55°C to 120°C.
Considering the great changes in the use environment of ultrasonic motors, the team did a lot of experiments in high-temperature environments, including structural design, material selection, drive control, and the design of other safety measures.
It is understood that the project lasted from 2015 to this year. The team staff did a lot of self-inspection and reliability confirmation, which further improved the environmental adaptability of the ultrasonic motor.
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