Discussion on Energy-saving Technology of Motor Frequency Conversion Control and Its Application
In China, after the sustainable development strategy is proposed, many companies and institutions are striving to achieve a low-carbon, energy-saving and environmentally-friendly life in the future. Energy conservation and emission reduction is an important measure to achieve a sustainable development strategy. In terms of power systems, energy conservation and emission reduction are mainly implemented for wind turbines, electric motors and pump equipment.
In order to achieve this goal, we vigorously develop and research AC motor frequency conversion speed control technology. Among the industrial and agricultural industries in China, the most widely used is the asynchronous AC motor. The asynchronous motor has the disadvantages of low power factor, poor speed regulation capability and high energy consumption. After applying the motor variable frequency energy-saving technology to the asynchronous AC motor, these problems of the asynchronous AC motor can be well solved. It can well realize the energy saving and emission reduction work of asynchronous AC motors and contribute to China's sustainable development strategy.
01. Analysis of the principle and characteristics of motor frequency conversion control technology
The variable frequency motor is a general term for the drive motor of the inverter, including the variable frequency induction motor and the inverter. It can improve the working efficiency of the motor and reduce the consumption of electric energy. Taking an alternator as an example, the formula for the rotational speed is as follows:
N1=60f/p.(1)
In formula (1): n1 - synchronous speed;
F——power frequency, 50Hz;
p - the number of motor pole pairs.
The motor slip ratio is expressed as:
s=(n1?Cn)/n1.(2)
In formula (2): s - motor slip rate;
n - motor speed.
It can be derived from equations (1) and (2):
n=60f(1-s)/p.(3)
The motor frequency conversion control technology can control the output frequency and the output voltage well through the frequency converter. This is a remarkable feature of the motor frequency conversion control technology, which is not available in other motor control systems. At the same time, the motor frequency conversion control technology also has the function of soft start and notification. Electromagnetic design reduces the resistance of the electronics and the rotor. Can achieve infinitely variable speed. Less power consumption, fully reflecting the characteristics of energy saving and emission reduction.
