In later generations, as long as electric bicycles are not equipped with speed limits, the speed can easily reach more than 60 kilometers per hour.
As long as there are five batteries, the battery life of the electric vehicle will be more than 120 miles.
As for the warranty mileage, there is no upper limit.
Generally speaking, the life of an electric bicycle is enough to exceed 50,000 kilometers.
so.
These goals proposed by Li Donglai are not excessive at all.
But in this era, these goals are unimaginable.
There was a buzz of discussion in the conference room.
"Are you kidding? If the range can reach 100 kilometers, why do we need a gasoline car?"
"That is, there is also the lifespan of electric vehicles. Others may not understand it. I specialize in electric motors. The longest lifespan of electric vehicles is only 5,000 kilometers."
"Don't say anything. Since Director Li proposed this project, he must be sure of it."
Mo Shanfeng patted the table to remind the researchers.
Unlike these people, he has participated in previous research projects as an engineer several times.
Each research goal seemed unbelievable, but under the command of Li Donglai, the researchers turned decay into magic and developed products in incredible ways.
Mo Shanfeng was considered a veteran and had a very high status in the minds of this group of researchers. When everyone heard what he said in a low voice, they immediately shut their mouths and stopped talking.
At this time, Li Donglai continued: "Due to the difficulty of the project, I decided to set up a special task force. The leader of this group is Comrade Mo Shanfeng."
As he spoke, Li Donglai opened the material, pointed to the drawing on the first page and introduced: "What you see now is a motor, which is a brushless motor specially designed by me for electric bicycles."
Brushless Motor.....
As soon as these words came out, the conference room suddenly became quiet. The researchers all raised their heads and stared at Li Donglai.
Motors are the most commonly used components in electrical engineering. They range from the rotor in a micro-generator to the power device of an electric excavator. They are all made of motors.
but.
The main structure of the motor is the stator, rotor and brushes.
Although the carbon brushes slide and rub against each other with the commutator, the fusion is easy to cause wear and tear, and the carbon brushes need to be replaced regularly.
At the same time, the on-off alternation between the carbon brush and the coil terminal will cause electric sparks, produce electromagnetic breakage, and interfere with electronic equipment.
It seems there are many disadvantages.
but.
The motor obtains rotational torque through the rotating magnetic field, thereby outputting kinetic energy.
In this process, the brushes and the commutator need to be in constant contact and friction, so as to conduct electricity and commutate during rotation.
In other words, the motor must have a carbon brush structure.
Brushless motor, what's going on?
Li Donglai seemed to see their doubts and said with a smile: "Considering the various disadvantages of brushed motors, I developed this kind of motor that does not require brushes. It consists of a motor body and a driver. It adopts electronic commutation and coils.
It doesn't move, the magnetic pole rotates. You can see the specific design plan on the material."
Mo Shanfeng quickly lowered his head and started studying the materials.
Other researchers also made the same choice as him.
The conference room suddenly became quiet.
I don't know how long it took.
snap
The materials in Mo Shanfeng's hand fell to the ground. He raised his head and looked at Li Donglai in disbelief.
"Director Li...the brushless motor you designed seems to really work!"
As an electrical expert, Mo Shanfeng understands the importance of brushless motors better than the average person.
The brushless DC motor does not have brushes, so the friction during operation is greatly reduced, the operation is smooth, and the noise is much lower.
Can be used to make silent fans.
Without the brushes, the wear of the brushless DC motor is mainly on the bearings. From a mechanical point of view, the brushless DC motor is almost a maintenance-free motor.
It can be said that the service life of a brushless DC motor will be dozens of times that of a brushed motor.
The warranty mileage of 100,000 miles proposed by Li Donglai seems to be a bit conservative. As long as the coil inside is not burned out, this thing can keep running.
Li Donglai nodded and smiled lightly: "I have carefully checked the design drawings. There should be no problems. Your task now is to manufacture the brushless DC motor. Then test its various performances to determine whether it can
Become the motor of an electric bicycle.”
"Understood!" Mo Shanfeng stood up suddenly and accepted this glorious task.
Just kidding, the brushless motor they are going to make will be the world's first brushless motor. They will change the history of electrical engineering, and maybe even leave a strong mark on future textbooks. How can you not be excited?
After handing over the task of manufacturing motors to Mo Shanfeng, Li Donglai began to tackle the most difficult issue in electric bicycles - the battery of electric bicycles.
In fact, in this era, some foresighted people in China have realized the importance of new energy and have already started research on batteries.
The batteries developed in China were even among the most advanced in the world for a time.
It is just because the domestic economic level is relatively low, there is a lack of scientific research funds, and those research institutes lack understanding of the market and are unable to turn research results into products. In the end, the research was abandoned halfway and was surpassed by foreign countries.
In this era, many domestic colleges and universities and scientific research institutions have conducted research on alkaline fuel cells.
Among them, the Beijing Battery Research Center is the most famous.
Li Donglai originally wanted to establish a battery research center in Beijing to jointly develop lead-acid batteries that can be used in electric vehicles.
But when Director Liu of the research center heard that lead-acid batteries were a civilian product, he immediately stood up with a hint of joking at the corner of his mouth.
"Director Li, I originally admired your steel rolling mill laboratory. You have developed so many excellent products and brought glory to the country. But I am really disappointed."
This chapter is not finished yet, please click on the next page to continue reading the exciting content! Director Liu is a well-known professor in China, an authority in chemical engineering, and a leader in the field of battery research. Most people have to be polite when they see him.
Li Donglai didn't care about his identity and asked directly: "Professor Liu, are there any problems with the research project in our laboratory?"
"Of course! Not only is there a problem, it's a big problem!" Professor Liu said unceremoniously: "Due to their size and weight, lead-acid batteries can only be used for civilian use, and now our domestic research focus is on alkaline fuel cells.
You are going the wrong way!"
Li Aiguo certainly knows about alkaline fuel cells.
This technology is also called a Bacon fuel cell, named after its British inventor, Francis Thomas Bacon.
It is an electrochemical energy storage device that can directly convert chemical energy stored in fuel and oxygen into electrical energy. It has high conversion energy efficiency and no pollution. The amount of carbon dioxide emitted during operation is also lower than 60% of traditional thermal power plants.
%.
Once it appeared, it became popular all over the world and became the most advanced battery technology.
More importantly, it can provide energy for space equipment.
Domestic research institutes have also launched research.
but.
In the following years, alkaline dye batteries were not popularized in the world for only one reason: high price and short life.
These two shortcomings are definitely not a problem when applied to some projects regardless of cost.
However, civilian products focus on low prices and economical benefits.
So that in later generations, this kind of fuel cell project can only become a deceptive project on PPT.
And Professor Liu actually regarded this project as a treasure.
How ridiculous.
But Li Donglai can understand Professor Liu.
After all, his research funds come from above, and he only needs to be responsible for the above and produce results, then everyone will be happy, and he may become famous.
Even if you can't produce results, there will be no consequences. If you publish a few papers using experimental data, your status in the academic circle will increase a lot.
With a project like this that is sure to make a profit, why would he take the risk to research civilian battery technology?
"Okay, Professor Liu, if the higher authorities cut off your research funding now, would you still be able to say such a thing?"
Understanding is understanding, Li Donglai replied without hesitation.
In later generations, a large part of the reason why domestic technological development slowed down was because people like Professor Liu occupied high positions.
"You..." Professor Liu did not expect that Li Donglai would not give him any face at all.
If Li Donglai hadn't been the director of the steel rolling mill laboratory, he would have been kicked out long ago.
Li Donglai was still busy with work and was not in the mood to argue with Professor Liu. He ignored him and stood up and left.
Professor Liu was so angry that his lips trembled and he shook the phone to complain to the ministry.
I originally thought that I could use my position as the director of the research institute and my status in academia to force the ministry to put pressure on the steel rolling mill laboratory.
I just didn't expect that after hearing his complaint, the other party just said a few words of comfort and hung up the phone.
"Snapped"
Professor Liu threw the phone on the table and said angrily: "It's so abominable. A young boy who only made two or three inventions dares to point fingers in front of me. If I had the equipment of a steel rolling mill laboratory,
Equipment, fuel cells have been developed a long time ago..."
At this time, Professor Liu's assistant's eyes suddenly lit up when he heard this.
He came over and said in a low voice: "Professor, since the steel rolling mill laboratory is now preparing to study batteries, our research institute is the leader in this field, so we can step in!"
"Meet in?" Professor Liu looked a little confused and looked at the assistant up and down.
"Yes, we can send researchers to the steel rolling mill laboratory. If the steel rolling mill laboratory becomes famous, then we will be credited with it. If Li Donglai messes up, it will be a good time for you to step forward.
.”
After listening to the assistant's words, Professor Liu suddenly clapped his hands and said with a big smile: "Okay, Xiao Wang, I didn't expect you to come up with such a brilliant idea."
The assistant licked his face and said with a smile: "Professor, this is all because of your good teaching."
Professor Liu thought for a moment and felt that this was a sure-profit deal. In order to show his sincerity, he personally brought the information to the ministry.
After the comrades in the ministry learned about Professor Liu's idea, they immediately raised their hands to express their agreement.
Professor Liu is a well-known expert in batteries in China. If he can join the battery research project in the steel rolling mill laboratory, the success rate of the project will be greatly increased.
So the comrade in charge of liaison dialed Li Donglai's phone number personally.
"What, Professor Liu from the Beijing Battery Research Center wants to cooperate with our laboratory? Sorry, all the researchers in our laboratory feel that Professor Liu is not qualified enough and there is no way to cooperate with him. Goodbye!"
Listening to the busy beep coming from the phone, the comrades in the ministry looked confused.
Professor Liu couldn't wait to ask: "How is it? What did the laboratory at the steel rolling mill say?"
"Director Li said you are not qualified..." The comrades from the ministry and committee stared wide-eyed.
Professor Liu: "......"
His vision went dark and he almost fainted.
It's so abominable. This Li Donglai is so abominable.
Generally speaking, people of their caliber will not show it even if they have any disagreements with each other.
When both sides are thinking about how to put people to death, they will still greet each other with smiles.
This kid Li Donglai is too unruly.
But it was this seemingly unreasonable approach that left Professor Liu feeling helpless.
.....
Of course, Li Donglai didn't know what Professor Liu was thinking. He simply didn't like Professor Liu and didn't intend to cooperate with him.
Plus, he now has better partners.
Professor Liu Mingde from Southeast Institute of Chemical Materials.
Professor Liu Mingde was the first to start researching lead-acid batteries in China, and he had achieved considerable results. However, because alkaline dye batteries are the mainstream of current battery research, his superiors have gradually reduced research funding.
At the same time, it is limited by technical level. In recent years, Professor Liu Mingde has not come up with anything new.
In the office, Li Donglai pointed to Professor Liu Mingde's materials and said to Zhang Qingcui: "I think this is the person we are looking for."
Zhang Qingcui agreed: "According to the data, Professor Liu Mingde has a five-member research team in the institute. If we can bring this research team back to the capital, we will definitely be able to get twice the result with half the effort."
"You book a train ticket for me now, and I'll go south right away."
Li Donglai had a resolute and resolute temper. After making his decision, he immediately asked Zhang Qingcui to buy the train ticket.
He didn't even have time to return home, so he just called Ding Qiunan to tell him. Li Donglai took Zhang Qingcui and took a train for more than ten hours to a small city in the southeast.
Walking out of the simple train station, Li Donglai rubbed his hands and exhaled a cloud of white mist.
Zhang Qingcui's excited voice came to her ears: "Director Li, look, there is someone to greet us."
Li Donglai looked along Zhang Qingcui's fingers, and sure enough he saw a thin young man not far away, holding a sign made of kraft paper.
It says "Warmly welcome Professor Li."
Professor Li... Li Donglai then remembered that he was also a professor.
He stretched out his hand and waved to the young man.
The young man felt sorry for himself and strode over with the sign in hand.
Perhaps because he had stood in the cold wind for too long, the young man's face turned red from the cold and his hair was covered with frost.
"Comrade, how long have you been waiting?"
"Because I was afraid of wasting time, I came at five o'clock in the morning and waited for about five hours..." the young man said sheepishly.
