Rebirth 2008: I Can Make Money Reading

(I wrote about the motor, this chapter is more professional, if you don’t like it, don’t subscribe; I wrote it simpler and easier to understand, but the readability will be worse no matter what)

The time has come to December 8th.

The car-making project started in early September, and the three-month period that Muyang gave graduates to make mistakes has passed, and the project has officially started, moving towards the direction of prototype cars.

In the past three months, these graduates have absorbed a lot of knowledge like a dry sponge, and the company has paid a lot for it.

The dozens of top-notch cars purchased at a cost of 100 to 200 million yuan were disassembled and reassembled by the people of the car project team. After researching and comparing the parts of various high-end brands of cars, there are a few cars that cannot be reinstalled, and there are also many parts She pretended to be broken, and was even asked by Mu Yang to perform a wire-cut anatomical analysis.

Several researchers saw that the Lamborghini sports car they dismantled could not be put back together, and they collapsed for a day. This was also the first car whose parts were damaged by the car project team.

The project team leader saw that the chairman was coming to patrol, and apologized to him: "Chairman, I'm sorry, it was our fault, the bearing was removed, we couldn't put it back, and we messed up the car with millions of dollars. "

Mu Yang said indifferently: "These cars are bought for your research, since they are for research, they must be damaged, which is normal.

Now millions of cars dare not be disassembled for research. How to develop a better car? In the future, we may have to disassemble equipment worth hundreds of millions.

When engaging in scientific research, especially top projects, don’t be influenced by these superficial things, and dare to try;

When you develop a more powerful car, the headache will be our competitors. They also have to spend millions or even tens of millions to buy our car and go back to study it, and they are still at a loss.

So, it’s okay to mess it up, the main thing is to see what you have researched and whether it is worthwhile, this is the most important thing. "

After Mu Yang finished speaking, he felt that these researchers couldn't let go. He put on his gloves, picked up a sharp hammer, and came to a Rolls-Royce Phantom. The car door, "boom boom boom" a few times, the glass was smashed by Mu Yang, and the car door also had a few more dents.

A dozen researchers around Mu Yang watched the car worth nearly ten million being smashed by the chairman. They were very distressed and shocked by the chairman's operation.

After Mu Yang smashed it, he handed the hammer to those researchers: "Smash it for me!"

"Chairman, forget it."

"Stop rambling, just smash it. If you don't smash it, how will you know whether the car is strong or not? If you don't experience it yourself, how will you know if the car you designed will work?" Mu Yang said sternly, "I have been here for three months to let you Make mistakes, if you don't make mistakes, it means that you haven't done enough and haven't made progress!"

Under Mu Yang's strong request, several researchers who had a broken mentality still smashed a few times.

Don't smash it, I didn't see the chairman lose his temper.

After smashing it, the feeling is different, the fucking one is so cool.

After these people finished smashing, Mu Yang also asked the surrounding researchers to try smashing, and try to smash where they feel that they need to be strengthened.

Half an hour later, this Rolls-Royce was beyond recognition, the glass was all broken, the doors had a few holes, and the headlights were also smashed. It was almost like being smashed by a hooligan. Uncertain.

Mu Yang smiled cheerfully: "Look, the doors and glass of this car are not strong at all. If we want to build Future 01 and Future 02, if the car can be smashed like this, it's too embarrassing. I'm too embarrassed to take it out. Sell."

After finishing speaking, he said, "To be honest, I have never smashed a car. I have experienced it this time, and it is very cool. Are you happy?"

"Cool!"

"Very cool!"

"I smashed it without gloves, and my hands were a little numb from the vibration."

The researcher who smashed the car replied readily.

Mu Yang glanced at these R\u0026D personnel, especially the few researchers who accidentally broke the Lamborghini sports car. They did not have the mentality of collapse before. People with high emotional intelligence knew that the chairman smashed the car in order to break their psychological barrier.

"It's good. We do research. If we do something wrong, don't feel burdened. Instead, we need to learn from our mistakes, figure out where we made mistakes, and don't make mistakes again next time." Mu Yang waved his hand to let everyone Spread out and get on with things.

The story of Mu Yang smashing the Rolls-Royce quickly spread in the company. The employees admired the meaning of the chairman’s operation. No psychological barriers.

Mu Yang smashing the car was just a trivial matter, and he was immersed in the research of electric motors again.

There are many problems with the motor.

Demagnetization phenomenon, control technology, poor anti-black ability, limited high speed, and difficulty in starting are just descriptions of surface phenomena of technical difficulties, and should not be used to express technical indicators or parameters.

Technical indicators or technical parameters such as motor power, number of motor poles, protection level, explosion-proof level, peak speed, power density, efficiency, area ratio of high-efficiency area, torque, etc.

It is more accurate to use technical indicators or parameters to describe the differences between domestic and foreign motors.

In 2011, and even by 2020, there are still gaps between domestic motors and foreign motors in the following aspects: peak speed, power density, area ratio of high-efficiency area and cooling method.

The first aspect, the peak speed.

The peak speed is an important indicator of the drive motor, and it is also the most obvious indicator of the gap between the domestic drive motor and the foreign motor.

In the case of maximum power operation, the peak speed of most permanent magnet synchronous motors in China is between 4000-6000 rpm, while that in foreign countries is basically above 10000 rpm.

The motor of Xinghai Group, the technical theory has reached 13000 rpm.

The speed is mainly related to the manufacturing accuracy, process and materials of parts, such as the materials of shafts and bearings, fit clearance and uniformity.

As far as the material is concerned, the shaft is generally forged, not cast. The cast material has poor compactness, poor plasticity, and is easy to break.

Of course, no company is foolish enough to manufacture such high-rpm shaft cast material.

Shaft materials are generally 35, 45, 40Cr, 45Mn2, 40MnB, 35CrMo, 35CrMnSi, 40CrNiMo, etc., and have undergone quenching and tempering heat treatment process.

High-speed shafts like this require high temperature resistance, so heat-resistant steel (including Mo), such as 35CrMo and 40CrNiMo, must be used.

The surface of the shaft is worn, so the hardness is required to be very high, but the inside of the shaft is required to have enough toughness not to break easily, so it needs to be quenched and tempered. This process is the same as the blade of a household kitchen knife.

The manufacturing nature of 3D printers is similar to that of casting. Mu Yang is currently unable to solve the problem of the compactness of 3D printer materials, so he has not yet developed 3D printers.

Xinghai Group has good material casting and forging factories, world-leading machining equipment, advanced heat treatment equipment and technology, and the quality of the shafts produced is very good, which can reach the world-class level.

Of course, it is still not up to the world's top level, but it is enough to meet the design requirements.

At present, the company has manufactured a batch of shafts for motors, waiting to be loaded into the prototype machine.

The second point is the power level.

Although domestic motors can basically reach the international level in terms of power, there is a weight disadvantage under the same power condition, so there is a big gap in power density compared with the international level.

At present, the power density of permanent magnet synchronous motors in China is mostly in the range of 1 to 2 kW/kg, which is far from the target value of 3.5 kW/kg in 2020.

The weight of the motor is much lighter than that of the battery pack, and the casing is made of aluminum alloy. The power of a single machine is generally between 150-210kW.

According to the technical level in 2020, the general overall weight is between 50-65KG.

If the power density of the motor is mostly in the range of 1-2 kW/kg, then a single motor will be very heavy, which not only increases the weight of the vehicle, but also takes up space. one of the main reasons.

The motor technology purchased by Muyang can reach 4kW/kg in theory.

The dual motors are 625 horsepower, that is, the single motor is 312.5 horsepower.

In conversion, 1 horsepower = 0.735kW;

In other words, to reach 229.68kW, the theoretical motor weight is 57.42KG, which is relatively light for such a high-power motor.

However, after mass production, how much can actually be produced is still unknown.

A little worse, Mu Yang can also accept it.

If you entrust a domestic motor factory to produce, a single motor must reach more than 100KG, if you can't get it to 150KG, then you can still play.

The third point is the area ratio of the high-efficiency area.

The high-efficiency area of ​​motors in my country accounts for 70% to 75%, while foreign motors basically reach more than 80%.

In terms of motor efficiency, the highest efficiency of domestic motors has reached 94% to 96%, which has reached the level of Siemens, Remy and other enterprises.

The area ratio of the high-efficiency area is the key, and it is useless to occasionally reach 100% of the maximum power.

For example, for a 200kW motor, the actual output power is 80%, which is 160kW.

The high-efficiency zone refers to the system efficiency exceeding 80%, that is, above 160kW.

If the output power of the motor is stable above 160kW, the area ratio of the high-efficiency area is 100%.

In this regard, Muyang's requirement is to reach the advanced level abroad.

The fourth point is the cooling method.

The cooling method of motors has gradually developed from natural cooling to water cooling. At present, domestic and foreign motor companies mainly use water cooling. A few years later, foreign advanced motor companies have developed oil-cooled motors, which further improves the cooling efficiency of motors.

This is actually a problem of cost, and it is not difficult to solve it.

The speed is high and the temperature rises quickly, so oil cooling is used;

The speed is low, the temperature rises slowly, and water cooling can solve it, so there is no need to use oil cooling.

Xinghai Group optimizes materials, production technology, structural design, etc., and develops towards intelligence and digitalization.

If it can be successfully developed, it will be a permanent magnet synchronous motor with the world's top technical level.

Mu Yang spent 50 achievement points on the motor, which is not for nothing.

High power is easy to get, but if you want to be light and stable, the price is not cheap.

In 2021, the front motor of Weilai ES6 will adopt permanent magnet synchronous 160kW, which is a self-developed motor, and the market price of a single machine will be more than 30,000 yuan.

The cost price of Xinghai Group's 231.5kW motor is estimated to be about 20,000 yuan for a single machine, and 70,000 yuan to Hummer Company is not expensive at all.

The finance of Xinghai Hummer Company is independent from the headquarters of Xinghai Group. Hummer Company imports batteries, motors and other components from the headquarters, not at cost price, but at wholesale price, which is slightly lower than that sold to other car companies.