Technology: The naughty kid ruined my college entrance examination, but I turned over to nuclear fus

About ten minutes passed, and the person in charge of monitoring the data shook his head and signaled,

"No problem."

Under the power operation, although all interference from other programs is excluded, the permanent magnet synchronous motor still runs very stably without encountering the slightest obstacle.

The whole operation process can only be described by the word "smooth".

"Teacher Lu, do you want to continue?"

Bai Dehai asked.

"Continue for another thirty minutes."

"I need a little longer observation time."

Lu Yu said directly.

While speaking, his eyes did not move for half a minute, and he kept focusing on the running permanent magnet synchronous motor, and his mind was full of thoughts.

"This.... Okay.

Bai Dehai frowned, and a touch of entanglement flashed in his eyes.

Now the next acquisition negotiation is only a short time away! If a breakthrough cannot be successfully made before the start of negotiations, the fate of future car companies may be ...

According to his ideas, the research time that counts every second now should not be wasted on meaningless permanent magnet synchronous motors.

But.... Out of respect for Minister Sun, Bai Dehai finally handed over the command to Lu Yu!

Bai Dehai wanted to say something, but in the end he didn't argue anything:

"You guys do what Teacher Lu says!"

"This.... Be. "

The employees in the technical department are hesitant!

A few of them couldn't hold back their words, and even wanted to stand up and "rebel" Bai Dehai.

In their opinion, wasting time on this permanent magnet synchronous motor is ridiculous!

Not to mention thirty minutes, even if it runs for another three days, this permanent magnet synchronous motor will not have problems!

"Keep powering on!"

The researcher in charge of implementing the specific operation ordered.

"Zig!"

The current sparks burst out again, and the entire permanent magnet synchronous motor began to run at higher power...

"Permanent magnet synchronous motors consist of stators, rotors and end caps. The stator is basically the same as that of ordinary induction motors, and a laminated structure is adopted to reduce the iron consumption during motor operation. "

The rotor can be made solid or laminated. The armature winding can use centralized integer winding, or distributed short winding and unconventional winding.

Lu Yu didn't say a word, just quietly observed the running permanent magnet synchronous motor, thinking a lot in his mind.

He felt as if he had caught something!

Another thirty minutes passed....

"Half an hour has arrived!"

The researcher in charge of monitoring the data shook his head and pursed his lips:

"Everything is normal with the data, no problems were found!"

After 30 minutes of operation, the permanent magnet synchronous motor is still running very smoothly, and there is no problem at all.

The faces of many department employees showed a look of helplessness:

"Look, it has long been said, the problem cannot appear here at all!"

"That is, isn't this a waste of our research time?"

"There is not much time left before the start of the second negotiation meeting, and let such an unscrupulous person come and toss blindly, Mr. Wang is really ... Alas!

"Or let's simply leave early, and in the future, we will really let foreigners buy it, and I'm afraid we won't have a job."

"Worry, I still have a large family to support, millions of mortgages to repay..." An

unspeakable frustration appeared on the faces of almost every employee.

"Phew."

Minister Bai took a deep breath, looked at Lu Yu, and didn't know what to say for a moment.

In the end, I can only laugh at myself.

"yes, how could I believe that he could really change anything?"

"Even if he is the person recommended by Minister Sun, how much he has learned at this age, how can he solve the problems that so many of us can't solve?"

Bai Dehai shook his head and was about to persuade Lu Yu to give up.

But a laugh suddenly sounded in the research department without warning.

"Hahaha, sure enough!"

The corner of Lu Yu's mouth grinned, revealing a smile:

"It looks exactly the same as I guessed!"

His smile made the employees in the research department angry.

We worked so hard to help you do the experiment for so long, and we didn't achieve any useful results, and our jobs couldn't be saved, and you actually laughed so happily?

Isn't this under-flattened?!

"This friend, is there anything so funny?"

An employee asked with a dark face.

"Shouldn't you laugh when you find out the problem?"

Lu Yu came to the permanent magnet synchronous motor with a smile and pointed to it:

"It's exactly the same as I expected." The problem is on the permanent magnet synchronous motor, but it is too hidden to be discovered by you!

"Thanks to your help, I did this little test and let me find it."

The problem was found???

As soon as Lu Yu's words came out, everyone, including Bai Dehai, was stunned!

Bai Dehai hesitated for a moment, and asked with some disbelief:

"Teacher Lu, you just said that you found out the problem through this experiment?"

"Yes."

Lu Yu nodded calmly.

"But.... But isn't our experiment a failure this time?

Bai Dehai was a little puzzled, and frowned in confusion.

"You asked us to leave aside the interference of other modules and only run the permanent magnet synchronous motor, didn't you want to test whether it could work properly?"

"If the permanent magnet synchronous motor fails, then it proves that the problem is with it."

"But after more than forty minutes, the motor has been running in a process, doesn't this mean that the problem is not on it?"

As soon as he said this, all the employees in the audience also nodded in agreement.

"Yes!"

"This... Isn't that forty minutes wasted? How do you still find out the problem? Bai

Dehai's doubts were not only his doubts alone, but also the doubts of almost all of them, and there were many high-caliber students and high educations present...

But no one understood what Lu Yu's thinking logic was!

"Who told you that the fact that the motor is running smoothly all the time means that the experiment has failed?"

The corners of Lu Yu's mouth curved, and he slowly introduced:

"The reason why I asked you to abandon the other modules is to check the specific motor operation mode."

He pointed to the control panel and introduced:

"This permanent magnet synchronous motor, I have just had a comprehensive understanding of it."

"The magnetic circuit structure of its built-in rotor mainly includes three types: radial type, tangential type and hybrid type, and the difference between them mainly lies in the relationship between the magnetization direction of the permanent magnet and the rotation direction of the rotor."

"In the case of energization, the magnetic circuit structure is converted in three different forms of built-in rotors. Usually, because the permanent magnet is placed inside the rotor, the rotor surface can be made into a pole shoe, and the pole shoe can be built into a copper strip or cast aluminum to play a role in starting and damping, and the steady state and dynamic performance are better..."

In the research department, every researcher's ears are pricked up!"

A look of surprise flashed on the cheeks of many people!

As the R&D employees of future car companies, their understanding of their own car companies is naturally more excellent confidence!

But they never expected that Lu Yu, an outsider who had just come in, had a deeper understanding of their permanent magnet synchronous motor than they did!

Not only is the general direction extremely deep, but there is not even a trace of mistakes in details!

Lu Yu did not care about the surprise on their faces at all, and continued to introduce:

"When the air-gap synthetic magnetic field lags behind the main magnetic field of the rotor, the electromagnetic torque generated is opposite to the direction of rotation of the rotor, and the motor is in the state of power generation; Conversely, when the air-gap synthetic magnetic field is ahead of the rotor main magnetic field. "

The electromagnetic torque generated is the same as the rotor rotation direction, at which point the motor is electric. The angle between the main magnetic field of the rotor and the combined magnetic field of the air gap is called the power angle... That's the crux of the matter. "

Due to the asymmetry of the built-in rotor magnetic circuit, this creates magnetoresistive torque during operation."

"It helps to improve the power density and overload capacity of the motor itself, but such a structure is more prone to the problem of weak magnetic expansion."

"You look closely at the data just run, the field weakening parameters are running the motor."

"Obviously improved a dimension, although it has not been identified as abnormal data, but there has been a bit of abnormality in the dimension parameters."

Everyone's gaze followed the direction Lu Yu pointed to.

Sure enough, although the dimension parameters are still within the range of normal data, the deviation is not small.

"But.... Even so, it still works.

Bai Dehai swallowed a mouthful of spit and asked the doubts in his heart:

"Since it has not been marked as abnormal data by the system, this means that the deviation is still within the acceptable range and will not affect the normal operation of the car."