Chapter six hundred and thirty seventh free gift

The brushless motor is not a new invention. As early as the 1950s, American scientists used transistors to replace the brushes of traditional motors. This is the most primitive type of brushless motor.

However, any invention needs to be implemented into practical application in order to reflect its value.

In the 1950s, there was no motor rotor position detection device, so the brushless motor invented by the Americans had no starting ability at all, and could only be regarded as a model.

This is like the earliest platinum wire electric lamp, which has not been lit for a long time before a candle, and has no use value at all. Later, Edison improved the electric light bulb and made a light bulb that can be used for a long time, so people only remember that Edison invented the electric light bulb.

The same is true of brushless motors, an invention that was seen as useless in the early days. People will not remember that Americans have invented the most primitive brushless motor.

In the 1960s, the rotor position detection device was invented, and the brushless motor began to enter the application stage.

However, at that time, the brushless motor still used transistors. Due to the limited capacity of the transistors, the capacity of the brushless motor was relatively small, which was still unacceptable.

After the 1970s, semiconductor devices appeared one after another, and the brushless motor really entered the application. The Japanese at that time applied the brushless motor to the video recorder.

But the Japanese quickly discovered that brushless motors are really not as easy to use as brushed motors. Instead of spending time studying brushless motors, it is more cost-effective to upgrade brushed motors.

So brushless motors have been left out for more than 20 years. Until the end of the twentieth century, brushless motors were still something that my grandmother didn't love and my uncle didn't love.

Brushless motors at the time were almost useless except for longer lifespans.

The structure of the brushless motor is more complicated than that of the brushed motor, and the cost is higher than that of the brushed motor. Repair, just replace the motor.

So when it comes to commercial applications, people will naturally use mature brushed motors instead of expensive and poor brushless motors.

In the 21st century, developed countries have been studying traditional brushed motors for decades. They have high manufacturing level, mature technology and high-performance high-end motors, which have always been monopolized by developed countries.

In China's motor industry, materials are stuck in the neck, so high-end motors cannot be produced.

For mechanical equipment related to power, materials are always the most difficult problems to solve, and this aspect is China's weakness.

The scientific research of materials cannot be accomplished overnight, it takes time to accumulate.

For example, for a certain material, if you want to double the hardness, you need to increase the hardness by one-half, and if you want to increase the hardness by one-half, you need to increase the hardness by one-quarter, and so on. .

Therefore, the research on materials is carried out through continuous process improvement. After one experiment, the material properties are improved little by little, and finally the requirements are met.

In theory, as long as sufficient time is given, China's material technology can certainly reach the level of developed countries.

But you are making progress, and others are making progress. Everyone runs forward at the same speed, and the one who lags behind will always lag behind.

If it develops according to normal conditions, China's motor industry will also be like the engine industry. Although it is constantly developing, it has always been left behind by European and American countries.

However, the brushless motor has given the Chinese motor industry an opportunity to overtake in a corner.

With the improvement of semiconductor technology and the development of electronic technology, the practical application of brushless motors has become possible.

Especially after the emergence of permanent magnet brushless motors, the performance of brushless motors has surpassed that of traditional brushless motors.

In the final analysis, the rise of brushless motors is due to the development of material technology.

At the beginning of the 21st century, many domestic and foreign companies have realized the practical potential of brushless motors and began to improve the existing brushless motors.

The brushless motor research and development that Li Weidong needs to do is actually aimed at improving the existing brushless motor.

For example, improving the stability of the brushless motor, increasing the power of the brushless motor, strengthening the control accuracy of the brushless motor, reducing the noise and stability of the brushless motor, and so on.

As for the service life and power consumption, don't worry, this is the advantage of brushless motors.

There is no carbon brush in the brushless motor. The only place that will be worn is the main shaft, so in theory, there is no need to worry about wear. Since the parts will not be worn, the service life will naturally be greatly increased.

This is also an important reason why China can overtake the scimitar in the field of brushless motors. With the material technology in China at that time, there is no wear-resistant material, so the domestic motor has a high failure rate and a short service life.

The non-printed motor does not need to experience friction, so it does not need wear-resistant materials, which just makes up for China's shortcomings in wear-resistant materials. Therefore, the performance of domestic brushless motors is no worse than that of foreign ones.

When it comes to the improvement of brushless motors, we have to mention a legendary death row inmate.

This person, Li Hongtao, was born in the mid-1960s. He was smart and eager to learn since he was a child. At the age of fifteen, he won the second prize in the National Mathematical Olympiad.

You must know that in that era, the college entrance examination had just resumed, and many people who went to college were still unable to calculate functions. Li Hongtao, a junior high school student, can play the Olympiad, which shows that he is quite talented.

Later, Li Hongtao was admitted to the Department of Electronics of Zhejiang University. In the mid-1980s, he was definitely the best in the world to be admitted to Zhejiang University.

After graduating from university, Li Hongtao was assigned to work in a state-owned enterprise. However, he was not willing to stay in a state-owned enterprise for the rest of his life, so he chose to start his own business in the early 1990s.

However, starting a business requires capital. How could Li Hongtao, who had been working for a few years, have the money to start a business?

So he moved his mind, forged the seals and documents of state-owned enterprises, and withdrawn cash from the bank. Then he was taken to the jail.

Other criminals must have panicked when they were caught. However, Li Hongtao calmly remembered the structure of the police station and found an opportunity to escape from the police station. Since then, he has embarked on the road of fugitives.

This guy is indeed a talent. He needed a car when he was fleeing. Just by looking at an Audi car key a few times, he remembered the structure of the car key, and then imitated the same car key and drove the Audi away. .

But the policeman did not eat dry rice. Li Hongtao was quickly caught again, and this time he was sent to the detention center.

But this guy entered the detention center, and he still didn't stop. He made some simple tools, played an episode of Shawshank, and escaped from the detention center!

The so-called Skynet is sloppy and not leaking, how can you escape punishment if you break the law! Li Hongtao was soon caught again.

Originally, he was only guilty of forging documents and defrauding, but after a few years of serious reformation, he came out, but because of two prison escapes, he was sentenced to death for several crimes.

According to the law, if the death penalty is not executed immediately, the sentence needs to be suspended for two years. During these two years, if the performance is good, the sentence will be commuted to life imprisonment, and if there is a major meritorious performance, the sentence will be commuted to fixed-term imprisonment.

Li Hongtao, who was sentenced to death, finally came to his senses and began to accept reform in earnest.

During his sentence, Li Hongtao repeatedly applied to the prison administrators, hoping to obtain some materials and conduct mechanical experiments.

In places like prisons, Zhejiang University's top students are definitely more scarce than giant pandas, and Li Hongtao's performance in prison is also very good, and the prison finally approved Li Hongtao's application.

As a result, Li Hongtao invented a brushless electric excitation motor in prison, which not only applied for a national patent, but also won a national award.

The brushless excitation technology used in the brushless electric excitation motor is actually not a new technology. It appeared as early as the 1960s, but this technology is used in generator sets.

And Li Hongtao used this technology in brushless motors, which greatly improved the performance of brushless motors.

The brushless electric excitation motor invented by Li Hongtao can make the current not pass through the brush and the collector ring, but directly pass through the rectifier to become six points, and then send it into the motor. This is a very important thing for the brushless motor. breakthrough.

Although this brushless electric excitation motor has not been widely used, the design principle of this motor has been used for reference by later permanent magnet motors.

Later generations of permanent magnet brushless motors use permanent magnet materials to provide excitation, which is essentially the same as the power supply principle of brushless electric excitation motors.

The design of using permanent magnets to provide excitation makes the structure of the motor simpler, which also directly reduces the manufacturing difficulty and production cost of the motor. The original expensive motor has become the price of cabbage.

As for Li Hongtao, his sentence was gradually reduced due to his many meritorious performances. After he was released from prison, many companies even invited him to join him in scientific research.

...

The phone rang, and the caller ID was a long list of phone numbers.

Although Li Weidong couldn't remember such a long list of phone numbers, but looking at the area code in front of him, he knew that it was his cousin Zhou Rugui who was on the other side.

Hey, cousin, yes, I haven't been in touch for a long time. Are your uncle and aunt okay? Li Weidong said.

The two sides greeted each other's parents first, and then began to talk about serious business.

Weidong, this F4 group is really hot right now. Our streets and alleys, and even the bathrooms, are covered with their posters! You really have foresight in choosing them as their spokespersons.

Zhou Rugui paused, then continued: Several TV stations here are broadcasting Meteor Garden every day, and I heard that every time it is broadcast, the ratings are not low.

Even the discs of Meteor Garden are now in short supply. As long as there are discs of Meteor Garden at the roadside vendors, they will be swept away quickly. Many people even bought a disc player just to watch discs.

Li Weidong knew that the disc that Zhou Rugui was talking about was VCD, and the disc player was a VCD player.

After 2000, with the rapid development of VCD, VCD soon replaced video tape and became a must-have video playback device for families.

Due to the popularity of VCDs, there were also many small shops specializing in renting VCD discs. For a few cents, renting a few VCDs home can kill a night, which is much cheaper than other entertainment activities.

If you get acquainted with the boss, maybe you can get some extra benefits and rent a few videos exclusive to old customers.

So Li Weidong asked, Cousin, are the discs you're talking about genuine or pirated?

How can there be genuine copies of those sold by roadside stalls! Zhou Rugui continued; Anyway, Meteor Garden is broadcast on TV every day, and many people who make pirated discs directly record them from the TV, and then copy them to In the disc. Some discs were made in a hurry, and even the commercials in the middle were not cut!

So that's the case. Li Weidong then asked; Will it affect the clarity of the picture if it is recorded directly from the TV?

Of course it has an impact. The recording and broadcasting is definitely not as clear as the original source, and not only is the picture not as clear as the original, but also the sound quality is not as good as the original. But after a while, you can still watch it. Zhou Rugui said. .

Hearing this, Li Weidong already had an idea in his heart, and he asked, Cousin, can we buy the genuine source of Meteor Garden?

It shouldn't be a problem. Zhou Rugui answered.

Okay, you can help me buy a set of original film sources. Li Weidong said.

What do you want that thing for? Are you planning to introduce Meteor Garden to the mainland? Zhou Rugui asked puzzled.

Introducing Meteor Garden is something that TV stations should do. Li Weidong smiled slightly and then said, What I want to do is to let more people see this TV series.

...

After finishing the call with Zhou Rugui, Li Weidong called Zhong Yemao immediately.

Hey, Lao Zhong, do you know anyone who makes pirated VCDs? Li Weidong asked.

Chairman, it is against the law to make pirated VCDs! Zhong Yemao replied.

Just ask if you know each other? Li Weidong said directly.

I know. Zhong Yemao answered honestly.

I knew Lao Zhong, you must have connections in this area. Li Weidong continued: The person you know who makes pirated VCDs, how big is the production scale?

Look at what you asked, if the production scale is not large, it is impossible for me to know it!

Zhong Yemao lowered his voice and continued: The one I know is directly produced on the production line. Not only the discs, but also the packaging is very beautifully done, not worse than the genuine ones.

Do you still have a production line for pirated VCDs? Li Weidong asked in surprise.

You too underestimate it as a pirated copy! Zhong Yemao replied, Those with hundreds of recorders are all small workshops. The one I know is worth two million for one production line alone. If it is conservatively estimated, he can also produce 40,000 to 50,000 pirated VCDs a day.

Investing two million in a production line is not as good as producing microwave ovens. It's a serious business anyway. Why do you do pirated VCDs! Li Weidong sighed lightly.

My chairman, if he were to produce microwave ovens, he would be run down by our puppy electrical appliances soon! Zhong Yemao laughed and continued, Don't underestimate this pirated VCD, the profits are huge!

Even if a pirated VCD earns 50 cents, if he produces 50,000 copies a day, he can earn 25,000, and he can earn 2 million in 80 days. UU Kanshu www.uukanshu.com will earn back the cost of the production line. ! This must be faster than we can make money by producing microwave ovens.

That's right, my microwave oven production line won't recover the cost for 80 days. Li Weidong replied.

Zhong Yemao who was on the phone then asked, Chairman, why are you inquiring about this? Has the movie you invested in been pirated? Do you want to find the outlet for making pirated VCDs?

I haven't invested in movies recently, and besides, I'm not bad at the box office loss from pirated copies. Li Weidong paused, then said, I have a source for a TV series here, and I want to give it to those who make pirated VCDs. .

Send? Zhong Yemao was suddenly confused.

Yes, don't need a penny, give it away for nothing! Li Weidong replied.

Cheap is not good, and what is given away for free should not be a very exciting TV series, right? I guess even if you give it away for free, those who do pirated copies may not be willing to make VCDs, and they are afraid that they will not be able to sell it! Zhong Yemao asked.

Li Weidong smiled slightly: You can rest assured that the TV series I sent will definitely be popular all over the country once it is broadcast!