President Meng smiled faintly, "In the future, you will know!" It shows that you can't be regarded as a China expert, you must not only understand the Great Qing Dynasty, but also know more about the countries around the Great Qing Dynasty, so that you can be regarded as a China expert. Pen & Fun & Pavilion www.biquge.info"

President Meng's tricky words made Li Xiande stunned for a moment, and nodded, "After listening to Mr. Yue Meng's words, I really have a lot of knowledge, I should be careful when dealing with the Japanese in the future." ”

In fact, Li Xiande specially mentioned the Japanese to Xuan Yuemeng, but he deliberately wanted Xuan Yuemeng to know that he was stepping on two boats! He didn't have only Xuan Yuemeng as a choice.

In the afternoon, President Meng and Li Xiande had dinner and did not change his plans, he expected to leave for Washington in two days.

After meeting with Xuan Yuewu, President Meng listened to Xuan Yuewu's work report for more than a month, in general, it was satisfactory to Xuan Yuemeng, Xuan Yuewu was tired enough for more than a month, and President Meng was the same, several people have not rested.

President Meng told the stationmaster of the Americas station about the concept of Chinatown and Chinatown primary and secondary schools, and the overall planning of the Americas station was even if it entered the planning period in advance.

This trivial matter does not need to be asked by President Meng, for running primary and secondary schools, this is the United States, as long as you are willing to pay, teachers are not a problem, and at the same time, it can also support the development of education in Danzhou, and you can send a large number of primary and secondary school educators when the time comes!

As for universities and higher scientist levels, President Moe spends a little more energy. He is to take care personally.

Nikola Tesla, Serbian-American inventor, physicist, mechanical engineer, electrical engineer. He is considered an important promoter of the commercialization of electricity and is best known for his design of modern alternating current systems. However, this new type of power generation idea has not been paid attention to by the United States, and now DC generators are still dominant. Xuan Yuewu introduced to President Meng.

President Meng is very interested, DC generator is a machine that converts mechanical energy into DC electrical energy. It is mainly used as a DC motor required for DC motors, electrolysis, electroplating, electrometallurgy, charging and excitation of alternators. Although in places where direct current is needed, electric rectifier components are also used to turn alternating current into direct current, but from the perspective of ease of use, reliability of operation and some working performance, DC motors cannot be compared with alternators.

The generator was first produced in the second industrial revolution period, was made by the German engineer Siemens in 1866, it is driven by a water turbine, steam turbine, diesel engine or other power machinery, the water flow, air flow, fuel combustion or nuclear fission energy into function to the generator, and then converted by the generator into electricity.

Electricity is one of the most important sources of energy in modern society.

Although there are a variety of generators, they all work on the same principle and are based on the laws of electromagnetic force and induction.

Therefore, the general principle of generator construction is to use appropriate conductive materials and magnetic permeability to form circuits and magnetic circuits that carry out electromagnetic induction with each other, so as to generate electromagnetic power, so as to achieve the purpose of energy conversion.

In 1831 A.D., Faraday passed a wire in a closed circuit through an electromagnetic field, and the wire rotated to flow through the wire, so Faraday realized that there was a close connection between electricity and magnetic fields, and he built the first prototype generator, which included a copper disc that rotated in a magnetic field, which generated electricity.

Until now, all electricity was generated by electrostatic machines and batteries, neither of which could generate significant power.

However, Faraday's generator finally changed everything.

In 1832, the Frenchman Bixie invented the hand-cranked DC generator, the principle of which is to generate an induced electromotive force in the coil by rotating the permanent magnet to change the magnetic flux, and output this electromotive force in the form of DC voltage.

In 1866, Siemens of Germany invented the self-excited DC generator.

In 1869, Graham of Belgium made the ring armature and invented the ring armature generator. This type of generator uses water power to turn the rotor of the generator.

Because the construction of medium-sized power plants has been carried out in Tianjin, President Meng has always been very concerned about power generation, which is a watershed between modern technology and modern technology! Therefore, President Meng knows more in detail.

Now the mainstream of power generation in the United States is the DC generator, Edison is great, but in the process of scientific and technological progress, this great inventor has also stood in the position of blocking progress many times.

Tesla was determined to develop AC motors when he was in Edison, but because Edison insisted on only engaging in DC methods, he was not interested in Tesla's new power generation ideas, or felt that it was challenging his scientific research direction, and began to suppress it.

After listening to Xuan Yuewu's introduction to Nikola Tesla's situation, President Meng was very happy and felt that this was a good opportunity, in fact, the debate between DC and AC will continue for more than ten years, which seriously hinders the development of AC!

But President Meng is a crosser, of course, he knows that the future power generation is all alternating current, and only alternating current is the right way.

In the general direction, President Meng does not have to take the wrong path.

Nikola Tesla is a Serbian-American inventor, physicist, mechanical engineer, and electrical engineer. He is considered an important promoter of the commercialization of electricity and is best known for his design of modern alternating current systems. On the basis of the electromagnetic field theory discovered by Michael Faraday, Tesla has a number of revolutionary inventions in the field of electromagnetic fields. His numerous patents and theoretical work in electromagnetism are the cornerstones of modern wireless communication and radio.

President Meng met Nikola Tesla for the first time, because he was not supported by funds and was not allowed by the mainstream scientific research direction of this era, so Professor Nikola Tesla's work was stagnant and his living conditions were not good.

President Meng got straight to the point and proposed to Nikola Tesla to go to Danzhou, and the condition was to help him create an academy of sciences, and the annual salary was 20,000 US dollars a year!

Professor Nikola Tesla was stunned by President Moe, not only the money, but the price offered by President Moe was almost impossible to refuse!

The main thing is that President Meng thinks that AC power will become the mainstream in the future, and Nikola Tesla is impressed by the huge financial resources and knowledge of President Meng, Nikola Tesla thought for a few minutes and decided to go to Danzhou with his family!

President Meng is very happy, this is the first time he has gained scientific and technological talents since he came to the United States, and he even believes that this harvest is greater than the value of American knives and gold worth 260 million Chinese official silver, and technology represents the future.

Professor Nikola Tesla introduced his research direction to President Meng in detail.

President Meng is still very interested in industry and science and technology, if it were not for the heavy responsibility of the development of the whole country, history pushed him to the position of leader, President Meng is willing to be a scientific research worker, quite challenging, but also very satisfying.

Under the personal demonstration of Professor Nikola Tesla, President Meng picked up a lot of university knowledge, although in this era, ordinary modern engineering students, modern engineering students are still only college students in Professor Nikola Tesla, and they cannot be surpassed.

People are doing research and development in the process of starting from scratch, these are immortal-level characters, and President Meng admires scientists the most!

The generator is mainly composed of rotors, stators, brushes, end covers and bearings.

President Meng listened to Professor Nikola Tesla's explanation and disassembled the equipment himself.

Professor Nikola Tesla saw that Xuan Yuemeng actually disassembled it decently, "Mr. Yuemeng, do you know how to be mechanical?" ”

President Meng smiled: "We also have generators in Danzhou, and we have run a power plant in Tianjin, but we can't adapt to large-scale power supply!" ”

Professor Nikola Tesla nodded: "Once my AC power generation is successful, it will be able to adapt to large-scale power supply needs!" ”

The stator is composed of a stator core, a base, a wire-wrapped winding, and other structural parts that hold these components in place.

The rotor consists of a rotor pole, a rotor core, a slip ring, (also known as a copper ring. collector ring), rotating shaft and fan and other components. The generator current is generated by connecting and assembling the stator and rotor of the generator through the bearing, base and end cover, so that the rotor rotates in the stator, and a certain excitation current is introduced through the slip ring, so that the rotor becomes a rotating magnetic field, and the stator coil does the movement of cutting magnetic field lines, thereby generating an induced potential.

It is led out through the terminal block and connected to the circuit, so that an electric current is generated.

Because there is a break in the connection between the brush and the rotor, the rotor rotates in a certain direction to produce alternating current, referred to as alternating current.

A steam turbine generator is a generator for a steam turbine.

In order to obtain high efficiency, steam turbines are generally made at high speeds, usually 3000 rpm (frequency of 50Hz) or 3600 rpm (frequency of 60Hz).

In order to reduce the mechanical stress caused by centrifugal force and reduce the wind friction consumption of high-speed turbine generators, the rotor normally adopts a slender rotor.

Especially in the large-capacity high-speed unit above 3000 rpm, due to the relationship between the material strength, the rotor diameter is strictly limited, and generally cannot exceed 1.2 meters. The length of the rotor body is limited by the critical speed.

When the length of the body reaches more than 6 times the diameter, the second critical speed of the rotor will be close to the operating speed of the motor, and large vibrations may occur during operation.

Therefore, the size of the rotor of large high-speed turbine generators is strictly limited.

Depending on the form of energy, different generators can be made. Using water resources and water turbines, it can be made into hydro turbine generators; Due to the different reservoir capacity and head drop, it can be made into hydro turbine generators with different capacities and speeds.

Using coal, oil and other resources, and boilers, turbine steam engines, can be made into steam turbine generators, which are mostly high-speed motors (3000rpm). In addition, there are various types of generators that use energy such as wind, atomic, geothermal, and tidal energy.

Diesel generator set is a generator driven by an internal combustion engine fueled by diesel, which starts quickly and is easy to operate, but the cost of internal combustion engine power generation is high.

Diesel generator sets are generally used as emergency backup power supply, or mobile power stations and some areas where large power grids have not yet arrived. The speed of diesel generator is generally 1500 rpm, and it is relatively simple to manufacture. Therefore, the structural components of diesel generators, especially the rotating shafts, should have sufficient strength and rigidity to prevent these components from breaking due to vibration. In addition, in order to prevent the uneven angular velocity of the generator due to torque ripple, the voltage fluctuation will be caused and the light will flicker.

The rotor of the diesel generator is also required to have a large moment of inertia, and the natural torsional vibration frequency of the shaft system should be more than 20% different from the frequency of any alternating component in the torque ripple of the diesel engine, so as to avoid resonance and cause shaft breaking accidents.

Of course, these are just the research directions of Professor Nikola Tesla.

President Meng was pleasantly surprised: "You have a lot of time and sufficient funds to research, Professor Nikola Tesla, I will fully support you." High technology drives the development of science and technology as a whole, and I am more excited to get you than to get ten infantry divisions. ”

"Your evaluation is too high, Mr. Yue Meng, do you really think that the project I am studying is high-tech?" Nikola Tesla looked at this two-year-old rich man in amazement, the scientist has a strong ability to accept, and he is not surprised by President Meng for a long time like ordinary people.

President Meng smiled slightly, "Of course, history will prove that my vision is not wrong!" (To be continued.) )