Chapter 883 Technicians’ Great Gains
"You didn't convert the relative data into absolute data in the control computer?" Gao Zhendong was a little surprised. It shouldn't be necessary. This is the most basic operation.

"Yes, there are, but the working environment of the machine tool is relatively poor. It is close to the motor. The voltage fluctuation caused by the start and stop of the motor alone may cause the program of the microcontroller to run away. The change of electromagnetic field during operation may also cause the program to run away. At this time, even if the absolute data stored in the non-volatile memory is stored, it is meaningless to retrieve it again."

This is a problem of principle. It was very common in the early days when theories of peripheral devices, circuit design, and shell design had not reached a certain level. One of the early methods to detect the reliability of equipment with a single-chip microcomputer was to take a high-power electric drill, connect it to the same AC power supply as the single-chip microcomputer system, then bring the electric drill close to the single-chip microcomputer device, and start and stop the electric drill repeatedly. If it can withstand the test without flying, it is considered acceptable.

"Then what is your solution?" Gao Zhendong did not say anything directly, but instead looked at how they solved it themselves.

"On the one hand, we are trying to find ways to improve electromagnetic compatibility and solve the reliability problem during computer operation. However, this can only solve part of the problem and cannot completely eliminate it. After all, if a high-value part is being processed, it may cause the part to be scrapped and the loss will be very large. We cannot afford this risk." Under the influence of Gao Zhendong, the technical staff of the third factory consider the problem more comprehensively.

"So what are your considerations?"

"We thought, since you specifically mentioned the relative encoder, is there also an absolute encoder? If there is an absolute encoder, at least the motion data will not be lost. We will combine other technical means to basically solve this problem."

Oh, that's interesting. He can draw inferences from one example. Gao Zhendong laughed.

"Well, your idea makes sense. Indeed, there is an absolute multi-turn encoder. Have you asked the Guangyang factory?"

"You asked us, and we don't have it. We are here today to continue to learn from you." A comrade next to him said with a smile.

Wow, they brought quite a lot of people with them, Gao Zhendong laughed.

"Well, let's put the issue of the absolute encoder aside for now. Comrades from Guangyang Factory, bring your people here later and we'll have a good talk about this matter." Gao Zhendong did not directly solve the issue of the absolute encoder, but the comrades at Guangyang Factory were reassured. It didn't matter if it was solved two days earlier or later.

It is true that he came here today just to sound out the situation. Without everyone here, he might miss some details when relaying the information, which would be a waste of Mr. Gao's time.

Looking down at the comrades from Guangyang Factory who were nodding with joy on their faces, Gao Zhendong turned to look at the technicians from the Third Factory.

"You need to solve this problem comprehensively from several aspects and try to make it perfect."

Here he comes. Mr. Gao has always been so reliable. There are always unexpected surprises with him.

"One is the power supply. You need to isolate the power supply. In this regard, first, the circuit design, and second, the power supply device must be good."

The technicians at the third factory nodded repeatedly: "Yes, but we don't have many methods and theories when it comes to power supply. The devices are the same, and the power supply circuits we can come up with are still the classic circuits."

"Well, don't worry about the components for now. Maybe things will get better soon, but that won't solve the fundamental problem. We still have to work on the power supply. I'll give you some information later. If you study it carefully, things should get better."

In terms of devices, we still have to wait for the results of the 1218 power electronic devices, which will take some time, and the devices are not particularly meaningful for this situation. The various crosstalks coming from the power supply still need to be solved mainly by the entire circuit.

Thinking of this, Gao Zhendong recalled the famous HiFi joke in his previous life: water, electricity, fire and electricity, it has to be a HiFi guy.

As someone who had worked on projects with his supervisor during his undergraduate studies in his previous life, Gao Zhendong had a book on common electronic system power supply design. However, he couldn't give it to them right away. This material was from decades later, and the sample circuits in it contained a large number of components that did not exist at present. If he gave it to them directly, they would probably go crazy.

It takes some time to cut it down before you can take it out.

The technicians at the third factory were all delighted, as they knew this was good stuff, more or less theoretical in nature. It would not only solve their current problems, but could also be used in power supply design for similar systems. It could be said that for ordinary technicians, if they could thoroughly understand this book, they would basically have no worries for the rest of their lives.

I really don’t know how many good things Chief Engineer Gao has here.

Gao Zhendong's next words did not disappoint him. Mr. Gao really had a lot of good things here.

"As for the impact of electromagnetic environment on electronic systems, I have a set of information here. It's ready-made and you can take a look. Your work has gradually begun to enter the high-frequency field, so it's good to be exposed to these things in advance."

Gao Zhendong stood up, walked to the safe which was very famous in the Third Branch Factory and even in many ministries, and took out a set of information from it.

A set of information on the theory and practice of EMC design for high-frequency circuits.

This was a document Gao Zhendong had specially prepared when computers began to become popular. Just as he was about to make it public, comrades from the Third Factory came to him first.

EMC, electromagnetic compatibility.

Of course, Gao Zhendong's stuff is not the same as the electromagnetic compatibility design of multiple radars, communications and other equipment on ships and aircraft. It is not so high-end, but focuses on small electronic systems, how to do a good job of EMC design of an electronic device, and minimize the impact of EMI (electronic interference) on the circuit. EMI has a particularly serious impact on small signal and high-frequency circuits. If before this, the impact of EMC was not very serious because of the strong signal and low frequency, then when Gao Zhendong showed his skills and popularized computers more than ten or twenty years ahead of schedule, this thing became very important.

The set of methods that Gao Zhendong came up with has some theory and more practice. It basically covers all the common means of EMC design in high-frequency circuits from now to 60 years later, and many of them can be used right away.

Holding this set of equipment in their hands, the technicians of the third factory were extremely excited. It was a family heirloom! This heirloom! This thing alone could solve most of the EMC problems of themselves and all small electronic equipment at one stroke.

But he knew in his heart that he couldn't take this thing back to pass it down to his family, because there were rules about turtles going up to the sky (turtle butt).

"Okay, Mr. Gao, we will first study this set of EMC information, and then wait for you to give us the power supply design information, and try to solve the electromagnetic compatibility problems of the CNC machine tool in the power supply and circuit."

At this point, the absolute multi-turn encoder, which had clearly been solved, was not even the most important thing for him.

Mr. Gao raised three issues: power supply interference, circuit interference, and actuators. He then provided solutions in three directions, which solved the problem completely.

Looking at them, Gao Zhendong remembered a famous saying: "Since we are here, we are here now."

He smiled and asked, "Since you are here, think about what other problems you have and see if there is any solution."

Gao Zhendong has many solutions to detailed issues. As long as a problem is raised, the probability of getting a solution is very high.

After all, his major is the famous "Double E" (Electrical Engineering), which is related to electricity and everything except power generation. As a result, he has a lot of strange information in his hands.

The old masters and technicians from the third factory looked at each other.

"Mr. Gao, we do have an idea, but we don't know if it can be realized."

"Tell me about it." It's good to have ideas, it's scary to have no ideas.

"The speed and torque of our current motors are constant, which leads to a problem. When the machine tool is working, if you want to change the speed and torque, you need to use a mechanical speed change mechanism to complete it. In this way, the structure is complex, the failure rate is high, the volume is large, the inertia is large, and the speed that can be changed is also divided into multiple gears, which makes it difficult to change the speed accurately and continuously."

Everything else is easy to understand, but the large inertia is actually a big problem, which means it is difficult to change the output speed of the motor quickly and safely.

Gao Zhendong was happy and said, "You guys are really good at making plans in advance. We have just started, but you have already found the application direction."

"Well, I see. For now, you still have to use a mechanical speed changer to achieve this. But don't worry, in the near future, you will be able to use a system that can control the motor speed more easily. It will be fully electronic, and the speed control mechanism will have almost no mechanical parts. It can probably be operated continuously at 10% of the rated speed within the range of 100% to 100% and at % of the rated load. Um... you can call it a variable frequency motor."

Mechanical transmissions are still important and should be developed and researched, but the advantages of variable frequency motors here are simply too great.

The future that Gao Zhendong talked about makes comrades yearn for it.

"10%~100% speed regulation at full load?"

"continuous?"

"All electronic?"

Variable frequency motors first appeared in the late 60s and have a wide range of applications. They are basically the dominant force in any high-precision occasion.

Gao Zhendong nodded: "Yes, but it won't be used in the short term. It will take some time. You should focus on the mechanical speed control first. Don't stop."

"Okay, Mr. Gao, we got it." The people in the third factory were very happy. They knew that the "short time" that Mr. Gao mentioned was really a short time and it would not be too long.

At that time, we only need to use this new type of motor to replace the large and bulky mechanical variable speed motor system with many disadvantages, so that the function and performance of the product can be taken to a higher level.

After seeing them off, Gao Zhendong turned around and continued his work.

(End of this chapter)