1. The principle of frequency control technology

AC variable frequency speed regulation is a new technology developed in recent decades. It is recognized as one of the most promising speed regulation methods for its excellent speed regulation performance, remarkable power saving effect and wide applicability in various fields of national economy. AC variable frequency speed regulation technology is a comprehensive application of microcomputer technology, power electronics technology and motor drive technology. The basic principle is that under the on-off effect of power semiconductor devices, the power frequency AC voltage is changed into DC voltage through the rectifier bridge, and then the inverter is converted into AC voltage with adjustable frequency and voltage as the driving power of AC motor, so that the motor can obtain the requirements of stepless speed regulation It is one of the most efficient speed regulation methods without additional slip loss.

Based on the integration of strong and weak current and electromechanical integration, the comprehensive application of power electronic technology, micro technology and motor drive technology is called AC frequency conversion speed regulation technology. In this way, it can be used as an efficient speed regulation mode without additional slip loss, and at the same time, the motor can obtain the voltage and current required by stepless speed regulation. In the energy crisis, the development of frequency control technology, can effectively greatly improve the work efficiency, because it can automatically and smoothly speed up and slow down according to the motor load. In this way, by changing the frequency of the power supply of the motor, as a high-efficiency and high-performance speed regulation means, the frequency conversion speed regulation technology can achieve effective regulation.

2. Energy saving function of frequency control technology

With the rapid development of electronic technology, computer technology, automatic control technology and high-power output technology, AC motor variable frequency speed regulation technology has made a breakthrough progress, and has become a major means to save electricity, improve environment and promote technological progress, and has become a inevitable development trend. The obvious energy-saving effect and superior regulation performance make the frequency conversion energy-saving technology more and more widely used in China's coal mines, and the technology is more and more mature. The inverter with large capacity, multi-function and high reliability has been widely promoted and applied in coal mine production. It can save a lot of electric energy for coal mine, especially in the fluid load, and its energy saving rate is between 20% and 60%. The principle of frequency conversion control is: using frequency conversion motor to realize real soft start and smooth speed regulation, using frequency converter control to improve the power factor of input power supply, constant torque output below the basic frequency, output power changes with speed.