After making a decision in his heart, Ling Shizhe temporarily put aside the issue of allotment of shares to the Chinese employees in the company, and continued to discuss with Jiang Zhihua and Chen Shanxin: "Since this DC drive motor uses Ru iron boron permanent magnets, this should be a rare earth DC motor, right?" ”

"That's right." Chen Shanxin replied: "The original 240 locomotive in East Germany used an electrically excited brushless drive motor, which was technically difficult and the manufacturing process was complex. Although they are all DC motors, the manufacturing process of rare earth permanent magnet DC motors is much simpler. The only technical difficulty is the temperature control of the motor and the internal cleaning of the motor, in order to avoid water, dust, iron filings and other corrosion of the permanent magnet inside the motor, the motor I use a fully enclosed structure.

I use the structure of no iron core, no brush, and no magnetic damping, which changes the structure of the traditional motor using silicon steel sheet and winding stator, combined with the company's latest research and development of electronic intelligent frequency conversion technology, so that the efficiency of the motor system is more than 85% higher than that of the traditional DC motor.

This design has four major performance advantages: First, high efficiency and energy saving. The motor has a high power factor, no iron loss, no magnetic damping, and the efficiency can be greatly improved.

The second is light and material-saving, it is small in size, and its weight is only a fraction of that of the 240 locomotive drive motor. It can save 80% of steel, 100% of silicon steel sheets, and 50% of copper.

Third, the speed regulation is good, the motor speed and the power supply frequency are kept constant, which can simplify the frequency conversion speed regulation control system, with a wide range of speed regulation and high precision; It is easy to make a multi-pole, low-speed and high-power motor, which can cancel the transmission system such as gearbox and pulley to achieve direct drive.

Fourth, strong reliability. The motor runs at a low temperature, and the motor winding adopts polymer material precision insulation packaging technology, which has good environmental adaptability and reliable operation. ”

Speaking of their own profession. Chen Shanxin couldn't stop talking as soon as he opened the chatterbox, Ling Shizhe listened to him patiently, and said, "You said so many benefits about this motor. So what are the disadvantages? ”

"This ......"

Seeing Chen Shanxin's hesitation, Ling Shizhe smiled: "Everything has its disadvantages and advantages. There are as many advantages as there are disadvantages. We fully understand all the advantages and disadvantages of this motor, in order to determine its market application field and scope, you will not know this truth, right? Let's just say it has those drawbacks. ”

For a scientist, the scientific results he has worked hard to develop are like his own child, in their eyes, this child only has advantages, not disadvantages. It's flawless, but the reality is that everything has its own advantages and disadvantages. That is, Ling Shizhe, if someone else said so, Chen Shanxin would immediately turn his face with him, in his eyes, his own children are good, and others are not allowed to say that his children have shortcomings.

After three minutes of silence, Chen Shanxin spoke: "Due to the ironless design concept, there is no iron core in the motor. Therefore, the magnetic resistance of the magnetic circuit increases, and to produce a magnetic field of the same strength, a stronger magnet is required. This leads to an increase in costs. Second, this coreless DC motor has advantages at high speeds, and has no advantages at medium and low speeds. ”

"That's right." Ling Shizhe touched his chin and thought that the maximum rated speed that the body structure of the 240 locomotive could withstand was 180 km/h, and the actual maximum operating speed was 120 km/h. The rare earth permanent magnet ironless DC drive motor designed by Chen Jianxin has advantages in high speed and no advantage in low speed, and it is also suitable for 240 locomotives. With a little modification, the train can reach a speed of 160 kilometers per hour.

This is true for DC electric locomotives. It has reached its operating limit, if you want to continue to increase the speed of the train. To reach speeds of 200 km/h or 350 km/h, it is necessary to use an AC motor.

Suddenly, Ling Shizhe remembered that in 2012, the "bullet" train launched by the East Railway Company of Japan, with a maximum speed of up to 600 kilometers per hour, the motor used was also this ironless structure. If on the basis of the technology of this motor, a rare earth permanent magnet ironless AC motor is made, which just solves the power unit of the split high-speed train?

What are the characteristics of a coreless motor? There is an advantage to high speed, but there is no advantage to medium and low speed, isn't this in line with high-speed trains?

Thinking of this, Ling Shizhe asked a little eagerly: "If you replace it with an exchange one, isn't it ......?"

Chen Shanxin understood what he was referring to and said, "Chairman, we still have a long way to go if we want to build a high-speed train like the Japanese Shinkansen. Whether it is AC or DC, permanent magnet motors have a common disadvantage, that is, they are very sensitive to the environment, especially the temperature, if the temperature is too high or the environment is too harsh, it is easy for the permanent magnet in the motor to produce an irreparable risk of loss of magnetism, so the permanent magnet motor is designed to adopt a closed design to avoid water, dust, iron filings and other corrosion of the permanent magnet inside the motor.

But in this way, the heat dissipation of the motor has become a problem, especially the ultra-high power motor used in the high-speed train, the heat emitted is even more terrifying, therefore, to solve the problem of temperature control of the motor, will be the key to the success or failure of the high-speed train project. ”

Jiang Zhihua interjected: "Didn't you say that the drive motor designed with ironless structure has a very low temperature rise during operation? Then the temperature control of the motor should be easy to solve, right? ”

"That's a DC motor," Chen Xinhua said with a wry smile: "The heat value of a permanent magnet AC motor is much higher than that of a DC motor, why do I use an ironless structure?" It's not because the heat generated by the motor without the core structure is the lowest among all the other motors. ”

"So how did Europe and Japan solve this problem?"

"I don't know how Japan solves this problem, because Japan has always regarded the temperature control technology of the motor as their top secret," Chen Xinhua said: "At present, only Japan has mastered the temperature control technology of high-power drive motors in the world, and Europe has not mastered this technology, otherwise they will not ignore the advantages of power decentralized design and insist on using the front and tail locomotive centralized power drive mode." ”

"So that's the case, I said, the decentralized power system obviously has many benefits, why don't Europe use it, it turns out that the root is here. It took a long time. They didn't completely solve the heat dissipation problem of the high-power drive motor! Ling Shizhe was stunned.

"Isn't it, a decentralized power structure, where the train's drive motor is mounted?" Didn't wait for the two to answer. Chen Shanxin himself explained: "The bogie at the bottom of the train, you think about the bogie of the train is a little more space. In this small space, there are not only the steel wheels of the train, but also the shock absorption system of the train, the brake control system of the train, and the monitoring inductance components of the train.

Now we also have to install the drive motor of the train in it, and install the heat dissipation device of the motor after the end, just such a little space, how small the drive motor and heat dissipation device must be to be installed, and it must be a high-power motor. You must know that rare earth permanent magnet motor technology has only appeared in recent years. Japan's "Shinkansen" has been in operation since 1964, when there were no small-volume, high-power rare earth permanent magnet motors. ”

Ling Shizhe and Jiang Zhihua gasped, this Japanese is too powerful, the reason why Ling Shizhe adopts a split power layout on high-speed trains or new subways, its biggest reliance is on small size and large power rare earth permanent magnet motors, because only by mastering the rare earth permanent magnet motor technology, the split power structure will be possible. Before the birth of rare earth permanent magnet motors, the Japanese were able to install traditional motors in the bogies of trains and operate safely for so many years. This...... It's also too perverted, and you can figure it out with your toes how difficult it is.

Chen Shanxin seemed to be unsatisfied, and continued to hit the two, saying, "Do you know how they made the motor so small?" They invented a completely new motor structure that combined the drive wheels and the motor into a single unit, so that the motor was much smaller and could be installed in the bogie. This is a motor that combines the drive wheel and the motor into a single unit. We call this a full-tray motor. ”

Pointing to the Ru iron boron magnet on the test bench, "The full plate motor uses constant magnetic materials. Before the birth of Ru iron boron, this kind of magnet was a permanent magnet material with the largest magnetic energy per unit volume among all magnetic materials. Magnetic flux up to 320. In addition, the advantages of full-disk motors are long life, high torque, and low energy consumption; Its torque is more than 3 times that of ordinary brushless motors, and its service life is more than 2 times that of ordinary brushless motors, which can meet any complex road conditions. ”

Ling Shizhe thought for a while and said, "Our rare earth permanent magnet motor, can we use the one you just said...... What the...... Full disk motor structure? ”

"Yes, but in my opinion, the full plate motor is more suitable for electric motorcycles, the reason why the Japanese use the full plate motor on their "bullet" train, at that time was a helpless choice, since the birth of the rare earth permanent magnet motor, the Japanese have turned their attention to this new type of motor, but unlike us, they are engaged in rare earth three-phase AC asynchronous motor, which belongs to the second generation of motor technology, and we are engaged in rare earth permanent magnet synchronous motor. Technologically, we are a generation ahead of them. ”

"Where have you been to the technical progress of synchronous motors?"

Chen Shanxin explained: "It is still in the theoretical demonstration stage, after all, our current demand for rare earth permanent magnet synchronous motors is not so urgent, and high-power DC drive motors are the problems we need to solve in front of us." Pointing to the 240 locomotive in front, "The drive motor in East Germany is really good, but the technology is a bit outdated, and the manufacturing is not small, so I thought of replacing it with a rare earth permanent magnet DC motor."

I didn't expect to get the ultra-high-power rare earth permanent magnet synchronous motor used in high-speed trains in one step, but adopted a low-to-high, from simple to complex way. We first use subway buses, then electric locomotives, and finally high-speed trains. ”

Don't take too big a step, and achieve it step by step. This is the tone for the development of aero engines set by Ling Shizhe for Wang Yuanzhuo.

Ling Shizhe according to the development goals formulated by the power of the aero engine, Ling Shizhe told Wang Yuanzhuo at the beginning, not to do anything to push the turbofan aero engine as soon as it came up, but to build a small or micro turbofan engine, and wait for the small or micro engine manufacturing technology to master, and then launch the light engine, after the light turbofan engine technology is mastered, and then on the medium engine like EG2000 or F414.

With this step-by-step accumulation of experience and technology, by the time we finally launch a high-thrust turbofan engine like the F119 or F135, we already have enough experience and technology, and it is much easier to achieve.

A typical way of running in small steps, I didn't expect Chen Shanxin to think of a piece for him, to make small ones first, and then to make big ones. Giving him the motor is the right choice.

"By the way, next month West Germany will hold an international air show in Frankfurt, are you interested in picking up your motors for the exhibition?" Ling Shizhe asked.

"Nope." Chen Shanxin waved his hand, "I don't have aviation motors, so I still won't participate." What products are you going to bring with you this time? ”

"I don't know, we have to see what they come up with, but the new self-locking nut will definitely be brought this time," Ling Shizhe sighed: "Aircraft and aero engines are too expensive, I am counting on this air show, relying on this new type of self-locking nut, I can get more orders back, so as to make up for the hole." (To be continued) The struggle for the rebirth of the Gentleman's Gathering Hall is in Xiangjiang

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After the selection of the drive motor in Chapter 243 of the main text, you can return to the list.