The Red Era, the Opening University Speech

Chapter 309 Three-ring Parameters of Servo System

Not to mention, Li Mu doesn't like money at all.

He donated all the money to poor counties in the Midwest for educational expenses, and almost no one in the upper class was unaware of the fact.

The reason why I didn't expose it was that I felt the time was not right, and it would be difficult to give rewards after the truth was exposed.

"This is a good idea." Guo Mo nodded in agreement with Leader Qiu's suggestion, and said, "It can also confuse those who want to investigate Li Mu's identity."

"Now his identity as the River Map has become a thorn in the side of all countries."

"If we can have one more 'person' to properly divert some of their attention, it should be much safer."

"That's right, and this method is not sure whether it's true or false. Even if it is discovered, those foreigners may not believe that it is the 3+2-axis CNC milling machine developed by him." Tang Yanjie said with a smile.

The research at Kyoto First Machine Tool Plant cannot be separated from Li Mu.

With so many people, it's hard to ensure that the news won't leak.

But simply appointing a chief designer can solve this problem well.

After all, if you don’t know Li Mu, who would have thought that it was this young man who designed the 3+2-axis CNC milling machine.

Even if the evidence was placed in front of those foreigners, they probably wouldn't believe it.

……

Big Brother Embassy.

Yakov really didn't believe it!

He looked at the newspaper in his hand, his face as black as coal.

Especially when Alexi in front of him kept telling him how powerful Li Mu was, the veins on his forehead were throbbing.

He took a deep breath and said:

"Alexei, you still underestimate the cunning of the Xia people."

"The intelligence department has already checked this person's background. He is just a college graduate. It is impossible for him to be the reason for Xia Country's technological advancement."

"It's easy to guess that 'Hetu' is definitely an extremely mysterious research team, or even a code name for a research base."

At the end, Yakov could no longer suppress his anger.

Let the other party contact Li Mu, it doesn’t matter if he fails to do so.

Finally, he came back with such unclear news.

When Xia Kingdom was promoting Li Mu extensively, didn’t they conduct any investigation?

Of course it was impossible, so they immediately sent people to investigate thoroughly.

However, no matter how you check, Li Mu is just a student who does have some talent for semiconductors.

Even when he was in school, he developed an improved incandescent lamp and a two-way electric drill.

However, the difficulty of these inventions, compared with the later achievements made by the Xia Kingdom in the field of science and technology, is no exaggeration to say that one is in the earth and the other is in heaven.

"But, but his understanding of software engineering is indeed far beyond anyone else. You can fake a paper, but you can't fake a speech, right?" Alexei said unwillingly.

Since he couldn't find Li Mu, he could only look for information about Li Mu.

When I saw his article published in "Software Engineering", I was immediately amazed.

He even vaguely felt that this article would be the beginning of a new era.

Yakov said unhappily:
"You can also ask him to memorize the script in advance and just read it."

"It won't be that simple anyway."

"There are even some doubts from above that Xia Country has made such great technological progress because of its contact with Emperor M."

His last words made Alexei's mouth drop open in shock.

Is there any connection between Xia Kingdom and Emperor M?

If this is true, then their country is in great danger.

"Impossible. The development of semiconductor technology of Emperor M is far behind that of the current Xia Kingdom." Alexei shook his head in denial.

Because he was too shocked, he almost forgot that Emperor M was now just like them, following behind Xia Country and eating dust.

Even the ashes can’t be eaten.

After all, it is much more difficult for Emperor M to obtain the Type 01 and Type 02 computers developed by Country Xia than for them.

Yakov looked at Alexei who suddenly became smart, and said helplessly:
"Of course the higher-ups know about this, so they are just suspicious."

"You are a scholar. You are only responsible for taking the lead in learning software engineering. You don't need to think too much about it."

"But in order to dispel this suspicion, you have to make some efforts and find a way to get in touch with Li Mu more and see how much real talent and knowledge he has, and whether it is just a smokescreen thrown by Xia Guo."

Their current relationship with Xia State is quite delicate.

The situation was already developing towards hostility.

But unexpectedly, with the substantial progress of Xia's semiconductors and computers, the situation took a turn for the better and eased a lot.

After all, their current primary goal is to defeat Emperor M and become the sole overlord of the world.

The reason why the relationship with Xia State deteriorated was because they wanted to control Xia State and strengthen their own power in disguise. "But I can't even see him now!" Alexei looked distressed.

According to the information provided by their intelligence department, he and the exchange students lived in the place where Li Mu appeared most often - Beijing Institute of Technology.

But now, let alone in-depth contact, I haven’t even seen a shadow of it.

……

The next day, early.

Li Mu finished washing up and exercising.

So he rode his bicycle to Kyoto First Machine Tool Factory.

On the surface, everything around the factory was peaceful and no different from usual.

However, just as he approached the 500-meter range, a sentry appeared and stopped him directly: "Comrade, please show your ID."

"ID, is this okay?" Li Mu scratched his head. He had forgotten to ask Tang Yanjie for a pass, so he could only try with his consultant ID.

The guard took the document and checked it.

He immediately stood at attention and saluted, saying, "It's Consultant Li. Please go in. Dean Tang has told us."

"Thank you, you've worked hard." Li Mu breathed a sigh of relief when he heard that, and secretly admired Tang Yanjie for his proper arrangements.

……

Come into the factory.

As soon as he reached the door of a workshop, he heard a heated discussion inside.

When I walked closer and looked at the probe, I saw that it was the feeding system research team.

The team leader’s surname is Bai. He is in his fifties and is an authoritative professor of mechanical engineering at China Europe International Business University.

He listened at the door for a while and roughly understood the problems everyone was facing.

The feeding system mainly includes CNC system, spindle box, feeding servo system and auxiliary devices.

In order to adapt to different parts and different processing methods, the spindle parameters must be kept as required, and the spindle servo system of the CNC milling machine must be able to adjust the parameters within a wide range.

And the requirements for positioning accuracy and feed tracking accuracy are very high.

There are also issues with speed response and high torque output at low speeds, but these two problems have not yet been encountered by everyone.

Li Mu listened for a while and originally wanted to visit each group first, waiting for everyone to think about it and then take action to solve the problem himself if there was really no way to solve it.

Unexpectedly, just as I was about to turn around, I was discovered by Professor Bai who was drinking some tea and taking a rest inside.

The latter tried to call him back, but was choked by the water in his mouth and coughed violently: "Cough, cough, Li, Consultant Li."

Everyone who was discussing in the workshop immediately turned around.

Seeing that he was discovered by everyone, Li Mu turned his head halfway and turned it back, greeted everyone, and said: "I didn't expect everyone to come so early, it really makes a junior like me admire you!"

"Consultant Li, there's no need to be polite. You've come at the right time. We've encountered some problems in our research on the feed system, and I'd like to ask you for advice." Professor Bai coughed several times before he caught his breath and walked forward.

Everyone's eyes turned to Li Mu.

Even those who didn't know him before fully witnessed the abilities of this young man yesterday.

So some people have started taking out notes from their bags.

Li Mu looked at the pairs of expectant eyes looking at him, there were even visible bloodshot eyes in them.

It is conceivable that after he left yesterday, these experts and professors probably stayed up very late before they could rest.

After thinking about it, he decided to just say it. There weren't many young people here anyway. He said:
"In fact, to improve the feed speed range, what is needed is to optimize the design of the servo system and adjust the parameters. As for the position accuracy, it can be achieved by using high-precision position detection components and advanced control algorithms."

"Let's talk about the first point first. The key to optimizing the design and parameter adjustment of the servo system is to improve the response speed and stability of the system while ensuring the processing accuracy and surface quality."

"This can be achieved by adjusting the three loop parameters of the servo system, the current loop, the speed loop and the position loop..."

……

The 3+2 axis CNC system involves the use of computers. Each research and development team basically has two or three experts and professors in the field of computer technology and are not unfamiliar with software engineering.

But after all, it is not as good as the second-generation supercomputers that are currently being developed, so it sounds quite difficult.

As for other experts in mechanical engineering, let alone

Apart from being able to write notes with a loud noise, they didn't even have time to ask questions.

While they were resting and drinking water, someone slowly digested some of the content and asked:
"Consultant Li, what are the three-ring parameters of the servo system? What is the principle behind it? Can you explain it in more detail?"

Although the plan they had was quite detailed, it did not include all the details clearly written down at the bottom.

——It is impossible to write it clearly, otherwise it would not be a research plan but a research instruction manual.

Li Mu continued:
"The servo system adopts three-loop control, mainly to form a closed-loop control of the servo motor system. The voltage maps the current change, the current maps the torque size, the torque size maps the speed change, and the speed also maps the position change."

“It considers the integration of electrical and physical, starting from the current loop, to the speed loop, and the position loop, arranged in sequence from the inside to the outside, to jointly achieve alert control of the servo system.”

"Let's talk about the current loop first. It is the innermost loop that mainly controls the torque of the motor. It is completely performed inside the servo controller. The output current of each phase of the motor is detected by the Hall element, and the detected current is fed back to the current setting..."

(End of this chapter)