Compared with the technical content of gas turbines, low-voltage distribution cabinets can be said to have no technical content at all. Abb, Schneider (Note 1), Siemens' low-voltage electrical cabinets that swept across China in the 1980s were nothing more than standardization and modularity. The so-called high-end products are just added to several microcontrollers to form a microcomputer monitoring system. If we look at them from the perspective of Liang Yuan or Su Liangyu, there is no difficult point.

But this kind of difficult thing was also a lot of catch up with the Republic in the 1980s. Since the mid-1990s, private enterprises have occupied a place in low-end low-voltage electrical cabinets. Take the simplest and basic distribution boxes as for example, limited to the quality of steel, domestic boxes of the same thickness are seriously insufficient in strength and are prone to deformation.

The processing technology is rough. When the domestic box opens the cabinet door or drawer of the distribution box, screwdrivers and hammers are essential tools. What's more fatal is that the digital-analog hole errors are extremely high. After a normal two-point fixed equipment is installed, the other screw often needs to be manually punched to continue to be installed. Such a product is a complete nightmare for users, and these problems do not exist at all for Liang Yuan. Even the aero engine processing equipment in the 1970s is much more accurate than ordinary civilian processing equipment in the new century.

The equipment of the Northeast Locomotive Factory was originally purchased based on the annual production scale of 400 aircraft engines. In Liang Yuan's opinion, within ten years, there is no need to consider engine production capacity. The headache is the idle equipment.

The substation rectification core of the low-voltage distribution cabinet can be solved with GTO devices, and the only one left is a circuit breaker. This thing is technically difficult for medium or high voltage because the current arc extinguishing problem involves switching, but in low-voltage and weak current, it is purely structural design and insulating plastic raw materials. The structure of ordinary civil circuit breakers has no secret to Liang Yuan, who has been in a building for nearly ten years. In later generations, such a circuit breaker called air switches by the people, Liang Yuan can draw several brand structures at will.

After the Chinese New Year, he registered all of them. The first person to register air switch patents in China was Schneider's predecessor, Melanrilan. On May 11, 1988, Meilanrilan applied for an invention patent application to the Patent Office of the China Intellectual Property Office with the name "Combined Circuit Breaker Combined with Auxiliary Trip Unit and Multipole Circuit Breaker Unit". The State Patent Office granted his invention patent rights on July 17, 1993. First, let Abb, Siemens betrayed, and these foreign companies would not have thought that they would have killed them. In the desert of modern electrical technology in China, Liang Yuan thought proudly.

But what is the name of the insulating plastic used for air switch structures? Is it polyterephthalyl terephthalidine or polyphthalamide? It’s a pity that the professional courses in organic chemistry were not taught by Master Fang. If Master Fang taught him, he would definitely not forget it. He should be as easy as high-quality. One day, I have to ask Aunt Chu of Lanzhou Chemical Factory. I guess this thing is unlikely to be produced in China.

Liang Yuan stared out the window, and various thoughts were rapidly turning in his head.

"Xiaoyuan, what are you looking at?" Su Liangyu smiled ambiguously.

After the holiday, the two little girls and Liang Yuan were inseparable. Liang Yuan was caught by Su Liangyu in Nanhu Science and Technology Park. The two little girls also followed, but the two loli had no interest in the industrial principles that Liang Yuan had tinkering with, and went to the lake ice rink, which was only more than 20 meters away from the office building of the Science and Technology Park, to skate.

"Watch Jia Jia skating." Liang Yuan said with confidence.

Although Liang Haiping and Su Liangyu have regarded Liang Yuan as their peers in their hearts, they still like to use Ning Wanjia to joke with Liang Yuan, especially when Ning Wanjia encounters this problem, her face turns red and her eyes seem to be very cute, so Liang Haiping and Su Liangyu are happy with this kind of thing.

For a guy like Liang Yuan who is similar to a middle-aged uncle, this level of ridicule is simply immune.

"Old Su seems that you are really idle lately. Let's go and see the motor control system created in the laboratory." Liang Yuan said with a smile.

The two left the office building and walked along the small path by the lake towards the microprocessor laboratory.

The microprocessor laboratory of Nanhu Science and Technology Park is composed of two white color steel buildings. The clean workshop required for chip trials and small trials covers a small area. Therefore, it is directly placed in the color steel building.

"Lao Su, have you found the person in charge of the ** Device Laboratory?" Liang Yuan asked casually.

"I found a few, but the most likely one is a classmate from MIT. He works in Bell Labs. The contract with Bell expires in April this year. I heard that there was a high-profile investor in China. I was very curious about this. If both parties have the same views on the future, the possibility of returning to work in China is not ruled out." Su Liangyu said with a smile.

"Come on, Lao Su, it's too late for you to flatter you now. If I'm not satisfied with that control system, the funds for next year will definitely remain the same." Liang Yuan also said with a smile.

Turning over a small pavilion by the lake, the chip laboratory appeared in front of him. Liang Yuan glanced at the laboratory that was close to him, stopped, and turned to Su Liangyu and said, "Old Su, you can tell your classmates that the country has just reformed and opened up, and many industries are in a mess. There is a big gap between China and Bell Laboratory in terms of working environment and instruments. However, we are the same as Bell Laboratory in the pursuit of scientific progress and creative technology. Given our poor modern history, we are even more persistent than Bell Laboratory."

"Old Su, you can also ask your classmates, as one of the 28,000 scientists in Bell Labs and the godfather figure in China's electronic device industry, which one can better prove the value and meaning of life."

After hearing Liang Yuan say it, Su Liangyu remained silent for a long time, but his admiration for Liang Yuan became even deeper. If anyone said this, Su Liangyu would treat it as a high-sounding remark. If it was Liang Yuan, Su Liangyu believed it without doubt. In December, Liang Yuan learned from Tang Wan that the country issued the "Interim Regulations on Private Enterprises" next year that it was a foregone conclusion, and directly raised Su Liangyu's annual salary to 200,000 yuan, and signed a five-year contract with up to 6% equity incentives.

Su Liangyu, who has lived in the United States for many years, knows the meaning behind this contract. Liang Yuan truly treats himself as a partner in his career. Some of Liang Yuan's actions often make Su Liangyu have the illusion of cooperating with enlightened foreign investors. I really don't know where Liang Yuan, who has never lived abroad and has not received foreign education, learned about Western society and corporate operation knowledge. For example, the contract he gave him, he has never lived in Western society, and has been exposed to the most cutting-edge computer industry, and he will never be able to open that kind of contract.

"I heard from Xiaoyuan that it seems that if I don't return to work in China, my classmate will spend the rest of my life in regret." Su Liangyu decided to throw the trouble behind his head. Some people are probably really a lesson in some things.

"Haha, Lao Su, this is what you said, I will never admit it. Lao Su, you can ask your classmates. If you have time after the Lunar New Year, you can come to Shengjing for a walk. Regardless of whether you have the fate of working together, it is a good thing to go back to China to see it. The country has changed a lot in recent years."

"I'll ask during the Chinese New Year."

The two of them walked into the chip laboratory while talking.

The control and control system of an AC motor is much more complicated than a DC motor. The speed regulation of the DC motor is just a simple change of voltage. However, the speed regulation of the AC motor requires frequent rectification and inversion, which changes the voltage during rectification and changes the frequency during inversion, thereby achieving the purpose of motor speed regulation.

There was a round driving motor as big as a palm in front of Liang Yuan. There were several wires naked outside the motor. The wires came out of a circuit board with three large chips inlaid. There were several wires on the circuit board, which were connected to several switch knob-like devices. Su Liangyu personally turned on the motor power supply. After a slight humming sound, the motor turned quietly. Su Liangyu signaled Liang Yuan to twist the switch and knob on the circuit board.

Liang Yuan tried all the buttons one by one and found that the AC motor speed regulation system developed by Su Liangyu is infinitely close to the finished product state. Three microprocessors are used to process the data sent by Hall components that monitor the rotation of the motor, one is used to process the continuously variable speed of the motor, and the other is used to process the preset high, medium and low fixed wind speeds.

"Old Su, is this thing just a simple plc (Note 2) finished product?" Liang Yuan asked curiously.

"It's far from the real plc. The real plc can control various industrial equipment, with extremely high compatibility and a wide range of uses. We can only control motors with similar performance as this small motor. Other tasks cannot be done. I can only say that this system is a simple plc system for small AC motor control."

"I'm satisfied if I can have this for the time being. Lao Su, I'm still easy to pass on." Liang Yuan said with some emotion.

Now it is absolutely no problem to take out Su Liangyu's set of things and get a national gold medal. Although Liang Yuan does not know when the research and development of domestic AC motor speed control system in his previous life began, Liang Yuan is sure that there will definitely not be a certain impact before the mid-1990s. This work is still a large-scale transfer of Taiwan's electronics industry to the mainland. With sufficient specifications and varieties of microcontrollers, and with relatively complete certifications of various engineers, they gradually got on track.

In the early years, the domestic AC motor speed regulation research was not only purely theoretical research, but also programming on the finished product PLC that I bought back from abroad. I can only say that I know the reason but not the reason.

"Lao Su, how much power can this system use on the motor at most?" Liang Yuan asked.

"No more than 50 watts, all parameters can be matched by simply modifying them, but don't expect accuracy."

"It's good to use it. In addition to the leafless fan, I have a profitable deal here. I can count on Lao Su," Liang Yuan said with a smile.

Note 1: It was called Meilanrilan at that time.

Note 2: The full name is a programmable logic controller, which is essentially a computer dedicated to industrial control.

I have a lot of private affairs in the past few days. I am not at home and have been running outside. I am really sorry for the break for a few days (to be continued...)

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Chapter completed!