The supplier of the energy feedback device for the frequency converter reminds you that the frequency converter adjusts the speed by changing the frequency of the motor power supply. It is an ideal high-efficiency and high-performance speed regulation method. The frequency converter is an electronic circuit device that uses the on-off function of power electronic semiconductor devices to achieve high-power conversion and control of electrical energy, and can be intuitively controlled and displayed.
Due to the superiority of frequency converters, their application fields are becoming increasingly wide, and the technologies used are constantly expanding, while also pursuing the miniaturization of frequency converters. Due to the adoption of a new drain control electrode technology in the new generation of IGBTs, the saturation voltage (Ucesat) of the collector emitter interface is greatly reduced. Therefore, the use of this new device has low losses and has the effect of reducing heat generation and eliminating losses.
The synchronous speed expression of an AC motor is n=60f (1-s)/p (1), where n is the speed of the asynchronous motor; F is the frequency of the asynchronous motor; S is the motor slip rate; P is the number of poles of the electric motor. From the formula, we know that the speed n is proportional to the frequency f. As long as the frequency f is changed, the speed of the motor can be changed. When the frequency f changes within the range of 0-50Hz, the range of motor speed adjustment is very wide.
The reason why variable frequency speed regulation saves energy is mainly because it saves the wasted electrical energy during full speed operation. Especially in closed-loop speed control systems, such as constant pressure water supply systems, on-demand dragging is achieved, almost completely eliminating waste during the operation of the dragging system. This has achieved energy conservation on a large scale.
In fact, there is still a phenomenon of big horses pulling small cars in many occasions, and there is great potential in this regard. It is an undeniable fact that frequency converters can save electricity.
In fact, the specific effects achieved by frequency converters and even the power electronics industry are as follows:
1) Further improve the efficiency of energy conversion and reduce standby losses.
2) Avoid power pollution, minimize current harmonics, and improve power factor as much as possible.
3) Improve the electromagnetic compatibility of power supply devices and systems.
4) Reduce electrical noise.
5) Realize high-performance controllability.
The dust removal fan, water system, and feeding system of a certain steel plant have also adapted to the characteristics of frequency converters. After multiple theoretical verifications and practical tests, frequency converters have been adopted, making certain contributions to China's energy conservation and emission reduction cause.