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Compared with the technical content of the gas turbine, the low-voltage distribution cabinet can be said to have no technical content at all, ABB, Schneider, Siemens swept the low-voltage electrical cabinet across China in the eighties, nothing more than standardization, modularization, the so-called high-end products are just a number of single-chip microcomputers, composed of a microcomputer monitoring system, if Liang Yuan or Su Liangyu's point of view, there is no high difficulty.

But this kind of thing is not difficult, in the eighties of the republic also enough to catch up with a lot, from the mid-nineties, private enterprises in the low-end low-voltage electrical cabinet to occupy a place. Take the simplest and basic distribution box as an example, limited to the quality of steel, the strength of the domestic box of the same thickness is not enough, and it is easy to deform.

The processing technology is rough, when the domestic box opens the cabinet door or drawer of the distribution box, the screwdriver and hammer are essential tools, and the more lethal is the digital mold hole error used to install various circuit breakers, after the normal two-point fixed equipment is installed on a screw, another screw often needs to be manually drilled to continue to install, such a product is a complete nightmare for users, and these problems do not exist for Liang Yuan at all, even if it is an aero engine processing equipment in the seventies, it is much higher than the ordinary civilian processing equipment in the new century。

The equipment of the Northeast Locomotive Factory was originally planned and purchased according to the scale of 400 aero engines per year, and in Liang Yuan's view, within ten years, there is no need to consider the engine production capacity, and the headache should be the idle problem of equipment.

The substation rectifier core of the low-voltage distribution cabinet can be solved by GTO devices, and the remaining one is the circuit breaker. This thing in the medium voltage or high voltage, because the switch involves the current arc extinguishing problem is also very technical, but in the low voltage and weak current is purely the structural design and insulation plastic raw material problem, the structure of the ordinary civil circuit breaker, for Liang Yuan, who has been doing construction for nearly ten years, there is no secret at all, in later generations, this kind of circuit breaker called the air switch by the common people, Liang Yuan can draw several brands of structure.

After the New Year, he was all registered. On May 11, 1988, Meilan Gerlan filed an invention patent application with the patent office of the China Intellectual Property Office for the name of "combined circuit breaker combining auxiliary tripping unit and multi-pole circuit breaker unit". The State Patent Office granted him an invention patent on July 17, 1993. Let ABB first, Siemens will not think of killing these foreign companies. In the desert of modern electrical technology in China, there will be such a freak as himself, Liang Yuan thought proudly.

But what is the name of the insulating plastic used for the air switch structure? Is it polyterephthalyl p-phenylenediamine or polyphthalamide? It's a pity that the professional course of organic chemistry is not taught by Master Fang, if Master Fang teaches himself, he will definitely not forget, it should be as easy as a high number, and one day I have to ask Aunt Chu of the Lanzhou Chemical Plant, it is estimated that this thing is very likely to be produced in China at present.

Liang Yuan stared out the window, all kinds of thoughts racing 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, and 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 these industrial principles that Liang Yuan was tinkering with, and ran to the lake ice rink only more than 20 meters away from the office building of the Science and Technology Park.

"Watch Jiajia skate. Liang Yuan said confidently.

Although Liang Haiping and Su Liangyu have regarded Liang Yuan as their peers from the bottom of their hearts, they still like to use Ning Wanjia to make fun of Liang Yuan, especially when Ning Wanjia blushes when she encounters this kind of problem. The eyes are very cute as if they can drip water, so Liang Haiping and Su Liangyu are very happy about this kind of thing.

For a guy like Liang Yuan, who is similar to a middle-aged uncle, this kind of Cheng dù's ridicule is simply immune.

"Lao Su, it seems that you have been really idle recently, let's go and see the motor control system that has been made in the real yàn room. Liang Yuan said with a smile.

The two men left the office building and walked along the path by the lake towards the microprocessor room.

The microprocessor room in Nanhu Science and Technology Park is composed of two white color steel buildings, and the clean workshop required for chip pilot and small test 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 room?" Liang Yuan asked casually.

"I found a few, but the most likely to come is a classmate of mine at MIT, who works in Bell's room, and his contract with Bell expired in April this year. Su Liangyu said with a smile.

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

Turning around a small pavilion by the lake, the chip real yàn room appeared in front of him, Liang Yuan glanced at the real yàn room close at hand, stopped, turned to Su Liangyu and said: " Lao Su, you can tell your classmates that the country has just reformed and opened up, and many industries are waiting to be revived, and there will be a big gap between the domestic and Belshi rooms in terms of working environment and instruments and equipment, but the pursuit of scientific progress and innovation technology, we and Belshi are the same, in view of our poor recent history, even we are more persistent than Belshi rooms. ”

"Lao Su, you can also ask your classmates, as one of the 28,000 scientists in the Belshi Yàn room and the godfather of China's electronic device industry, which can better prove the value and meaning of life. ”

Su Liangyu was silent for a long time after listening to Liang Yuan, but his admiration for Liang Yuan in his heart was deeper, if anyone said this, Su Liangyu would be regarded as a high-sounding statement, but Su Liangyu was convinced that in December, Liang Yuan learned from Tang Wan that the "Interim Regulations on Private Enterprises" next year was a foregone conclusion, and directly raised Su Liangyu's annual salary to 200,000 yuan quietly, and signed a five-year contract including a maximum of 6% equity incentive.

Su Liangyu, who has lived in the United States for many years, understands the meaning behind this contract very well, and Liang Yuan sincerely treats himself as a partner in the business. Liang Yuan's behavior is just right, which often gives Su Liangyu 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 a foreign education, learned about the operation of Western society and enterprises, like the contract given to him, he has never lived in Western society and has been in contact with the most cutting-edge computer industry, and he will never be able to open that kind of contract.

"Listening to Xiao Yuanyi, it seems that if I don't return to China to work, my classmate will spend the rest of his life in regret. "Su Liangyu decided to put the troubles behind, some people are really God-given in some things.

"Hehe, 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 to go around, whether you have the fate to work together or not, it is also a good thing to return to China to see, the country has changed a lot in recent years. ”

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

The two walked into the chip room as they spoke.

The control system of AC motor is much more complex than that of DC motor, DC motor speed regulation is just a simple change of voltage, and AC motor speed regulation needs to be frequently rectified and inverted, the voltage is changed during rectification, and the frequency is changed during inverter, so as to achieve the purpose of motor speed regulation.

Liang Yuan had a palm-sized circular drive motor in front of him, and the motor was bare with a few wires, and the wires were threaded out of a circuit board inlaid with three large chips, and there were several wires on the circuit board, connected to several switch knob-like devices, Su Liangyu personally connected the motor power supply, and after a slight hum, the motor rotated quietly, and 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 was infinitely close to the finished state, and one of the three microprocessors was used to process the number sent back by the Hall element that monitored the number of motor revolutions, one was used to deal with the continuously variable speed of the motor, and one was used to deal with the pre-set high, medium and low fixed wind speeds.

"Lao Su, is this thing a simple PLC product with a box on the outside? Liang Yuan asked curiously.

"Far from the real PLC, the real PLC can control all kinds of industrial equipment, the compatibility is extremely high, the use is very wide, we develop this set of things can only control the motor with the same performance as this small motor, other work can not be done, it can only be said that this system is a simple PLC system for small AC motor control. ”

"I'm satisfied with this for the time being, Lao Su, I'm still very good. Liang Yuan said with some emotion.

Now Su Liangyu's set of things to mix the national gold medal is absolutely not a problem, although Liang Yuan does not know the previous life of the domestic AC motor speed regulation system research and development began, but Liang Yuan is sure that it will have a certain impact will definitely not be earlier than the mid-nineties, this work is still Taiwan's electronics industry large-scale transfer to the mainland, with enough specifications and varieties of single-chip microcomputer supply, with a relatively perfect variety of TI engineer certification, only gradually on the right track.

In the early years, in addition to pure theoretical research, the domestic AC motor speed regulation research was to program the finished PLC from abroad, which can only be said to know what it is, but not why it is.

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

"No more than 50 watts, you can match the parameters with simple modifications, but don't expect accuracy. ”

"It's good to be able to use it, in addition to the bladeless fan, I still have a profitable business here, but I can count on Lao Su's thing," Liang Yuan said with a smile.

Note 1: At that time, it was called Meilan Rilan.

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

Full of private affairs in the past few days, N more, not at home, has been running outside, I'm sorry for a few days (to be continued......)

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