The first DJ4 electric locomotive of Hongxing Factory has been assembled in the assembly workshop for many days, and the DJ4 traction motor system of Jiuzhou Industrial Co., Ltd. has also begun to be manufactured.

After a series of technical preparations, process preparations and production preparations, the first batch of traction motors began to be manufactured.

Control systems are also being manufactured to match the motors, not just a few motors, but the entire traction motor system.

The trial production of the motor is relatively smooth, because Jiuzhou Industrial Co., Ltd. has the experience of successfully manufacturing Shaoshan traction motors, and so far, it has successfully manufactured hundreds of first-class quality and superior performance Shaoshan series traction motors for Hongxing Factory.

It seems that it was a very correct choice to practice the Shaoshan series of motors and lay the foundation for the production and manufacture of DJ4 traction motors.

No, in the newly built large plant, several DJ4 traction motors are being trial-produced, and the progress is not bad, although there are some small technical and quality problems, but there are no big problems, on the whole, such a situation is enough to make people very satisfied.

Since it is an attempt to manufacture, there will always be some problems, such as Jiuzhou Industrial Co., Ltd., after the start of the manufacture of DJ4 traction motors, only some minor problems are exposed, which is very rare.

The production and manufacturing of the traction motor was relatively smooth, but the trial production of the entire DJ4 traction motor system was not smooth.

It stands to reason that there is a complete and scientific process manufacturing process, detailed process and technical information, and several motor experts, and the production and manufacturing should be relatively smooth, but in fact, it is not.

This is not a technical problem, but a lack of an important spare part, and it is still imported.

It is difficult for a good woman to cook without rice, this is the reason. No matter how good your technical level is, no matter how perfect your technical data is, if you don't have anything, you can only catch blind.

The production and manufacturing of DJ4 traction motor is going relatively smoothly, but the motor control system supporting it is in trouble.

Zhao Ke was reporting the situation in Tang Fei's office, and after listening to the report, Tang Fei's brows furrowed, and for the first time, he felt like he was stuck in his neck.

This is an imported accessory that needs to be purchased from abroad.

The simple version of the design and technical information provided by the system is relatively detailed, with the specifications and models of this accessory, with specifications and models, it stands to reason that it should be able to be purchased from the international market.

Tang Fei frowned slightly, and said slowly: "This thing is indispensable in our DJ4 traction motor system, without this thing, we would be more troublesome." ”

What is this, so important?

This is a semiconductor device widely used in the DJ4 electric locomotive, called "IGBT", IGBT is the abbreviation of the English word Insulated Gate Bipolar Transistor, its Chinese means insulated gate bipolar transistor.

It is a composite fully controlled voltage-driven power semiconductor device composed of BJT (bipolar triode) and MOS (insulated gate field effect transistor), which combines the advantages of high input impedance of MOSFET and low on-voltage drop of GTR.

Functionally speaking, IGBT is a circuit switch, the advantage is that it is controlled by voltage, the saturation voltage drop is small, and the withstand voltage is high. It is used in the order of tens to hundreds of volts and tens to hundreds of amperes. And the IGBT does not use mechanical buttons, it is controlled by a chip.

IGBT converts the alternating current on the power supply side into direct current at a given voltage, or converts various types of electricity into alternating current at the required frequency for use by the load. These circuits are collectively referred to as converters.

IGBT is the core device of energy conversion and transmission, commonly known as the "CPU" of power electronic devices, and it is widely used in rail transit, smart grid, aerospace, electric vehicles and new energy equipment.

At present, there is no domestic manufacturer or institution that can produce it, and it needs to be imported. In the DJ4 electric locomotive, this kind of thing is used in many places.

Can only rely on imports, Jiuzhou Industrial Co., Ltd. has taken the initiative to contact several foreign manufacturers who can produce and manufacture IBGT, reported the model, specifications and purchase quantity, the other party either directly refused, or has not replied.

Only one of the American companies replied with an offer, but the price was too high, and there was a feeling of being slaughtered, and Zhao Ke did not agree to the other party's offer for the time being.

"That's ......"

Tang Fei frowned, slowly walked around his office, and after thinking for a few minutes, Tang Fei said, "That's it, I'll go to the Red Star Factory, don't worry." ”

The Red Star plant also needs to purchase IGBTs, because this kind of thing is not only used in the motor traction system, but also in the entire DJ4 electric locomotive.

Thousands of IBGTs are used in the entire DJ4 electric locomotive. On the Harmony series of electric locomotives that have been successfully developed and manufactured in the future, each locomotive uses tens of thousands of IBGTs.

In the future bullet trains and high-speed railways, tens of thousands of IBGT will be needed on each train. In the future rail transit industry, the demand for this kind of thing is too great.

At present, the DJ4 electric locomotive needs thousands of yuan for each car, and with such a large demand, the Red Star Factory should have its own procurement channels.

Tang Fei held the hope that if the Red Star Factory had procurement channels and could import IBGT from abroad at a suitable price, then the IBGT he needed would also be purchased by the Red Star Factory, and after the purchase was returned, the Red Star Factory would give it to Jiuzhou Industrial Co., Ltd.

With such thoughts, Tang Fei comforted Zhao Ke, then left his office and drove to the Red Star Factory.

Don't look for Xie Zhenhua first, let alone Chang Jinlin, Tang Fei went to the procurement center.

Red Star Factory imports IBGT this kind of thing, then the procurement work must be in charge of the procurement center, go to the procurement center to ask, that is the most appropriate.

I hope they have a procurement channel, when he walked into the procurement center, Tang Fei thought so in his heart. Walking into the procurement center with a familiar way, the careful Tang Fei found that the atmosphere seemed to be a little wrong.

What's going on, is there something going on?

Tang Fei was puzzled in his heart, and happened to see an acquaintance, it was Yang Jun, Tang Fei grabbed it and asked: "Director Yang, what's wrong, what's going on in your procurement center?"

Yang Jun sighed and told the truth, it turned out that not long ago, Vice President Li Weibin, who was in charge of personnel, personally came to the procurement center and announced an appointment.

He was dismissed from the post of Prime Minister of the Procurement Centre, saying that he had been appointed separately. Chen Guihong was appointed to preside over all the affairs of the procurement center.

Hearing this, Tang Fei said jokingly: "This is a good thing for Brother Chen, he has been promoted." ”

Yang Jun sighed, shook his head, and didn't say anything else, just said softly: "Mr. Tang, you can find our Mr. Chen, he is in the office." ”

"Okay, I'll go to his office. Tang Fei said this, thinking in his mind as he walked in the direction of Chen Guihong's office.

What the hell is wrong with the people in the procurement center, just an ordinary personnel appointment, one by one. In addition, Brother Chen was promoted from deputy general manager to the head of the procurement center, which is a good thing.

Tang Fei couldn't figure it out, and couldn't help but shake his head as if laughing at himself.

What's even more strange is that when I walked into Chen Guihong's office, I found that Chen Guihong was in a daze, with a sad face.

This is not right, promoted to general manager, Chen Guihong should be happy!

"Brother Chen. Tang Fei shouted softly.

Chen Guihong came back to his senses from outside the iQue Fang, and when he saw that it was Tang Fei, his face was a little better, and he got up and said, "Brother, you're here!"

After speaking, he poured a cup of tea for Tang Fei, and said slowly: "Brother, now our procurement center is an eventful time, and I am sad to death now." ”

Seeing Chen Guihong say this, Tang Fei said puzzledly: "Brother Chen, what's wrong with you, you should be happy when you are promoted to the top of the procurement center, and you should be celebrated." ”

Chen Guihong smiled bitterly.

"Brother, don't you know, this position is not easy to sit, on the surface, I have been promoted to a level and become the leader of the procurement center, only one step away from the vice president of the Red Star Factory, but this also makes me sit on the volcano. ”

"Oh. Tang Fei looked at Chen Guihong puzzled, waiting for him to continue.

Chen Guihong continued: "My predecessor was suddenly dismissed because there was a problem with the procurement of IGBTs required by the DJ4 electric locomotive, and the IBGT required by the DJ4 electric locomotive could not be procured in place, and there has been no landing so far, which will inevitably affect the final assembly process of the DJ4. ”

"This matter made Chief Engineer Xie very angry, he reported to Chang Zongyi, Chang Zong also lost his temper, at this morning's office meeting, several leaders unified their opinions, something like this happened, someone needs to come out to take responsibility, so, my predecessor was dismissed. ”

What the!

After listening, Tang Fei's face changed slightly, the Red Star Factory also had problems with the procurement of IGBT, and he still pinned his hopes on the Red Star Factory, but now it seems that his hopes have been dashed.

Tang Fei felt anxious in his heart!

At this moment, he can fully understand Chen Guihong's mood, and he is really sitting on the volcano, if he can't purchase the IGBT needed for the DJ4 electric locomotive, his position is also dangerous.

Tang Fei said slowly: "Brother Chen, to be honest, the DJ4 traction motor system we are trying to produce also needs multiple models and specifications of IGBT, we have encountered difficulties in procurement, I came here this time, I want to ask for help, I didn't expect that the Red Star Factory also encountered difficulties in this regard." ”

Chen Guihong didn't speak again for the time being, as if he was thinking about something, at least for a few minutes, he said slowly: "It seems that I can only use the power of my family and ask my family for help." ”

Suddenly, Tang Fei became curious.

Tang Fei knew that Chen Guihong was from the capital, and it was estimated that he was still a child of a great family, but this was all along, Chen Guihong had not mentioned his family background, and Tang Fei had always been inconvenient to ask.

Could it be that this time I can learn about Chen Guihong's family background!

………

Today's third watch, the third watch is complete.

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