"After becoming DC, we send it directly to the main circuit of the power module behind. Under the control of the microcomputer, the DC power supply with variable output voltage is directly sent to the compressor to drive the DC motor to rotate."

This block diagram is not difficult, just a few things, as long as Qin Guan stays here for a while and waits for the marker to dry, it will never be wiped off.

The AC motor has a simple structure and low cost. However, if it is advanced, it is a DC motor. The principle of the DC motor is that the stator generates a rotating magnetic field and the rotor permanent magnetic field directly interacts to realize the operation of the compressor.

Its rotor is made of rare earth permanent magnet materials.

Thinking of this, Qin Guan remembered something again. In the history of parallel time and space, the country’s rare earth materials have always been sold at a low price of cabbage. Now that he is here, he must change this state. Rare earth materials are precious strategic resources, just like petroleum and nuclear raw materials, and must not be sold by greedy merchants at low prices.

Rare earth materials are essential raw materials for the manufacture of electric motors. All future generations of DC motors, whether it is a lightweight electric bicycle or an expensive Tesla sports car, are inseparable from rare earth materials.

Without this material, it is impossible to manufacture super-strong permanent magnets. At the same time, rare earths are inseparable in fields such as active phased array radar and high-temperature blades of advanced aero engines.

I am really a nanny, I need to manage everything, but I have to manage it. Since I have come to this era, it is to change the history of the motherland in this era, so that the motherland can become stronger earlier, so that the motherland does not need to Being bullied by foreign countries!

"Okay, the block diagram is drawn here. This type of DC inverter air conditioner can also be called a full DC variable speed air conditioner. Its biggest feature is that it saves a link between DC and AC, which can save more electricity." Qin Guan said: "At least 20% of the electricity can be saved. At the same time, DC frequency conversion is better than AC frequency conversion in terms of comfort, quietness, life, and control accuracy."

This point is obvious. The DC inverter compressor does not have the electromagnetic induction effect of the stator's rotating magnetic field on the rotor. The control board overcomes the electromagnetic noise and rotor loss of the AC inverter compressor. These aspects must be high efficiency and low noise. .

"The disadvantage is that the cost of DC inverter air conditioners is higher than that of AC inverter air conditioners."

After Qin Guan finished speaking, all the islanders present were stunned. They thought they were air-conditioning experts, but now, it seems that Qin Guan’s remarks are also quite reasonable. Yes, if this scheme is adopted, It is indeed better than our own frequency conversion solution, but it sounds a bit mysterious.

Advanced DC motor? There is also direct microcomputer control. Do they have this kind of technology?

"Mr Qin, are you talking about a mature plan?" Finally, Koizumi couldn't help but asked.

Qin nodded in view: "Yes, it's mature."

Mature solutions, of course, are in the cemetery system.

Air conditioners generally give the impression that they are for civilian use. In fact, the army’s demand for air conditioners is also high. It is absolutely impossible to export weapon systems to desert countries without qualified air conditioners.

For example, the famous Changhong Factory in later generations was originally a military factory. Of course, their air-conditioning technology can also be used for military purposes, so they can be found in the cemetery.

Civil air conditioners can be supplied for military use. Of course, there are also air conditioners specially developed for the military. You must know that the technical indicators of air conditioners required by the military are much higher than those for civilian use.

Military air-conditioning equipment can normally heat and cool within the temperature range of -45℃ to 55℃; can withstand vibrations with a frequency of 5 to 200 Hz and an acceleration value of 2.5g; it can work normally at an altitude of 4500 meters; it can resist sand Dust, salt spray, mold, sun exposure, heavy rain, high humidity environment, etc. And the military also requires free lifetime service during the design life of 10 to 12 years.

Even the famous Miss Dong of later generations rarely accepts such orders. The demand is small and the requirements are high. Only a few professional manufacturers will produce it. For example, in China, there is a special Swan refrigeration company. As early as 1974, It developed the first domestic air conditioner; later they developed a military shelter air conditioner, which is used in various military vehicles including the Hongqi 2B mobile medium-high altitude, medium- and short-range surface-to-air missile control vehicle.

In the past few years, domestic tanks were able to successfully open the market in the country of date palms, and this company's air conditioner was also indispensable.

Therefore, there are examples of what Qin Guan said now. We have advanced air conditioning technology!

Qin Guan said it was justified and well-founded. The technical experts of Ryosan Heavy Industries all pondered: "In this case, a high-power thyristor is needed."

In the direct control circuit of direct current, there must be various professional devices, especially in order to play the current role, there must be high-power thyristors. This device is not even available in island countries. If there is, they directly Just go for it. Qin Guan didn't speak, but showed an inscrutable smile. You don't have it, it doesn't mean that we don't have it either. You also know our advanced level.

The smile of Qin Guan finally made the other party discouraged, and he didn't even dare to raise the issue of DC motors. Maybe, Han really has first-class technology, and they have already developed it.

So, what next?

"Can we introduce your technology?" Koizumi asked suddenly.

Island countries are good at learning. This also made Qin Guan admire that various technologies were not invented by island countries, but they were developed by them.

For example, LCD technology came out of Eagle Country’s laboratory. However, after studying in the island country, people from the island country quickly invented a calculator and successfully used the LCD technology.

They are not afraid of the gap. When there is a gap, they face the gap squarely and will soon catch up.

Now, when they heard that Han was the leader of a generation of technology, of course they wanted to introduce it. Through the introduction, they quickly realized domestic production, and then they developed better performance. The islanders took this path.

Qin Guan still had a smile on his face: "Well, let's talk about it later."

As a patriot, Qin Guan doesn't really want to do any business with islanders. He just wants to pit these people. There are so many partners to choose from. Why choose islanders?

Qin Guan has such a narrow concept, and this concept cannot be changed.