doomsday survival

Chapter 222 Reappearance of Power
Shi Jian and Feng Kuang measured the circuit again and found that there was no problem. The measurement results showed that the circuit was completely correct.

"Since there is no problem with the circuit, it must be a problem with the motor." Feng Kuang said.

Shi Jian also agreed with this conclusion. The rotor of this motor is a little stiff when rotating, which is probably caused by this reason.

"Is it not lubricated? But I have already oiled it." Shi Jian said to Feng Kuang.

When he found the motor, Shi Jian found that the rotor was a bit rough, so he specially used the car's engine oil to light some on the rotor, which should be able to seep into it.

Like Shi Jian, Feng Kuang, who majored in chemistry, doesn't know much about electricity.After thinking about it, Feng Kuang said, "Let's take it apart and have a look, maybe there's something wrong with it."

Anyway, there is no way to send a call now, so Shi Jian gritted his teeth and agreed in line with the principle of treating a dead horse as a living horse doctor.

The two immediately started to work, and opened the end cover of the motor.

After a lot of effort, the end cap was finally opened, and they knew what the problem was.

It turned out that the magnetic steel in the motor fell off, which is also one of the common faults of electric bicycles.

The working environment of bicycle motors is relatively harsh, especially in rainy and snowy days and in open and humid environments, where they are most prone to rust.The oxidized rust is easy to expand between the magnetic steel and the bracket, expanding the magnetic steel, causing the magnetic steel to fall off or shift its position, causing the motor stator and rotor to rub against each other. This is what people call "sweeping the bore".

As soon as Shi Jian and Feng Kuang opened the end cover of the motor, they found the magnets that had fallen off.

"What should I do?" Feng Kuang looked at the fallen magnet and had no choice.

"How about," Shi Jian said hesitantly, "Let's stick it on and try?"

"I can see it."

The two took out the fallen magnet, cleaned up the residual resin glue, rust and dust, and then began to think of ways to stick the magnet firmly.

Now there is no universal glue, everything can only be done by themselves.Fortunately, Feng Kuang, a high-achieving student majoring in chemical engineering, has a solid theoretical foundation, but he knows a kind of metal adhesive that can be made by himself.

However, this kind of binder needs phosphoric acid, aluminum hydroxide and copper oxide powder, and it needs to be prepared by Feng Kuang and a little bit of extraction.Fortunately, the amount needed is not too much, and the most phosphoric acid is only [-] milliliters, as long as the laboratory extraction method is used.

These things made Feng Kuang spend the next day in various chemical experiments without any rest.

This time, Xia Rou was very happy. Feng Kuang had already said that he would teach her chemistry knowledge, but he never had the time.Now that she knew about it, she immediately didn't even go to school, and stayed with Feng Kuang for a whole day, marveling at those miraculous chemical reactions and full of approval.

Although Xia Rou has no novice to operate, it has strengthened her determination to learn chemistry.And Feng Kuang also promised again and again that as long as he was busy with this period of time, he would teach her well.

After all the raw materials were prepared, Fengkuang began to prepare the adhesive.He first poured a small amount of phosphoric acid into a thin glass, then slowly poured eight grams of aluminum hydroxide into the phosphoric acid, and adjusted it evenly; finally, he added all the remaining phosphoric acid to form an emulsion.And heat it until it is completely transparent and glycerin-like, and keep it warm for about two hours, so that the water in the phosphoric acid-aluminum hydroxide liquid is evaporated, and the adhesive is basically made.

After doing this, Feng Kuang and Shi Jian got together again.

Fengkuang first put a small amount of copper oxide on a glass plate, then dripped the prepared phosphoric acid-aluminum hydroxide liquid, and mixed it with wood chips for about 5 minutes, until it was pus-like, until it could pull out strands of more than ten centimeters. stopped.

Looking at the slightly glossy black paste, Shi Jian was still a little uneasy. He really didn't know if it was useful or not.

Feng Kuang looked at Shi Jian's nervous expression, snorted, and said, "You still don't believe my level? Don't you look down on me?" After finishing speaking, he directly applied the black paste to the derusted magnet Between the steel and the body, correct the position of the magnetic steel according to the original direction, and stick them together directly.

After gluing, Feng Kuang pressed it hard again to ensure that it was consistent with the other magnetic steel surfaces, and then stopped.

"In three days, it will definitely be firm." Feng Kuang assured, patting his chest.

"Gods and Buddhas bless you, don't let me torment you any longer." Shi Jian prayed softly.

"It's okay, at worst, let's think of a way. There are so many cars in the old area. It's really impossible to remove all the generators inside. There must be one that works. It's much better than you modifying this thing." Feng Kuang said nonchalantly .

"I also wanted to disassemble the generator, but when I saw this at the beginning, I was so happy that I forgot about it. After I came back, I thought about doing my own research to see if it can realize power generation. Maybe I will add another one in the future. The road to generate electricity." Shi Jian said with a wry smile.

"What more ways can I get? I'm going to make trouble for myself, and I have to suffer with the old man." Feng Kuang complained.

"Old Feng, you can't think like that," Shi Jian explained, "We're going all the way south, and you've seen it too. Although there are more cars than I did at that time, they are much less compared to electric cars. Every one An electric car is a possible generator.”

Feng Kuang shrugged his shoulders and said: "Your idea is really weird. Even if this thing generates electricity, it only has a voltage of more than 20 volts. What can you use it for?"

Shi Jian smiled and said, "It's better than nothing. Besides, didn't you say that there were already electric cars at that time. As long as we can find an electric car, the motor on it will be more powerful."

When Feng Kuang heard what Shi Jian said, he nodded in approval and said, "If it's the motor of an electric car, it's still a bit practical. This should be an experimental product for practicing hands."

"You can't say that, as long as this works, then I don't have to go to the car to charge my phone in the future, which saves a lot of trouble, doesn't it?" Shi Jian said with a smile.

"Forget it, you're right, go back to sleep when you're tired." Feng Kuang walked back after finishing speaking.

Three days later, Shi Jian checked the magnetic steel and found that it was firmly bonded. There should be no problem, so he assembled the motor.Turn the motor rotor again, the three-purpose meter finally has an indication, and the generator modification is complete!

The refitted generator still has some disadvantages, because of uneven rotation, the voltage generated by the generator is unstable, so the obtained power supply voltage cannot be used directly, and must be stabilized before it can be used.

Shi Jian and Feng Kuang did some more research, removed the switching power supply circuit from an old computer power supply, and made corresponding modifications to make a voltage regulator.After connecting the voltage regulator, turn the rotor again, and this time the output voltage finally stabilized.

That night, in Shi Jian's room, a different light shot out, which surprised everyone in the tribe who saw it.

　There are a lot of things today, the update is late, and this chapter is 2000 words, please forgive me!
　　
　
(End of this chapter)