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   In the field of variable speed motors , high-voltage AC speed regulation is only a tiger, and it is not easy to tame this tiger. Although the frequency control that has been promoted to the public has achieved success in low voltage and low power, there are many problems in porting to high voltage. How to obtain economical and efficient high-voltage AC speed regulation is a world-class problem that is uncompromising.
The stepless speed regulation of high voltage and high power AC motors is an important field in the development of modern industry. It not only has significant economic benefits, but also has very important social benefits. The speed regulation and energy saving of fans and pumps is an example. According to investigations by relevant departments, only China's high-power fan and water pump energy-saving market is as high as 80 billion yuan, and it is increasing.
Research and development of new AC speed regulation is a recognized world-class problem in the motor field. Following more than a hundred years of traditional theory and motor structure, it is difficult for many explorers to step beyond the pool. It is said that American scholar Bose has also studied " internal feed speed regulation " , but ultimately failed due to lack of correct theoretical guidance.
In order to achieve a breakthrough, we must explore a new theory of speed regulation. What is the essence of motor speed regulation? There is no clear conclusion about the traditional motor theory. Only by figuring out this problem, the motor speed regulation can make the village clear.
Everyone knows that in the activities of understanding and transforming nature, human beings cannot replace objective laws with subjective will. We analyze and study the exchange speed motor must be based on science, not just by artificial subjective definition. Just as the " Goldbach conjecture " is called " conjecture " , although it is correct to verify the " guess " with a limited number of data , it is because of the lack of scientific proof of the law and formula, even if it is only a stone's throw away, it can't change the " conjecture ". "in the title. It can be seen how serious and rigorous science is, not to mention the use of artificial definitions to guide objective laws.
The essence of motor speed regulation is based on power control. There are kinds of power control principles, one is electromagnetic power control, the change is the ideal no-load speed of the motor, the speed regulation is high-efficiency energy-saving speed regulation; the other is the loss power control, increasing the motor speed drop, the speed regulation is Low efficiency, energy-consuming speed regulation. The motor speed is generally expressed as the difference between the ideal no-load speed and the speed drop. All motor speed control methods are attributed to the power control principle, or the subordinate electromagnetic power control principle, or the subordinate loss power control principle.
The essence of motor speed regulation is closely related to the motor speed control method and performance and speed regulation mechanism, indicating the development direction of AC speed regulation. P theory shows that the frequency control that we currently admire is only one kind of high efficiency speed regulation, not the only speed regulation method of speed regulating motor . The chopper internal feed speed regulation and frequency conversion speed regulation only have different control objects, and there is no difference in principle essence.
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