Application of Sine Wave Inverter on CNC Machine Tool Spindle
Abstract
The sine wave inverter is a frequency conversion device that converts AC or DC voltage into adjustable, stable frequency and voltage alternating current according to a certain algorithm. This article introduces the application of sine wave inverter on the main spindle of CNC machine tool, and analyzes its advantages, such as energy saving and low noise.
Keywords: sine wave inverter, CNC machine tool, frequency conversion, energy conservation
1 Introduction
CNC machine tools are automated machine tools equipped with numerical control devices. Its main purpose is to improve production efficiency and product quality. Therefore, it requires high control accuracy, high speed stability and high reliability. But its development has also brought some contradictions, such as low speed response and high energy consumption.The energy saving measures of CNC machine tools are divided into mechanical energy saving and electrical energy saving. The latter is more effective, and the primary electrical energy saving method is frequency conversion.
In frequency conversion, the sine wave inverter is often selected, which has the advantages of strong adaptability and high performance. By adjusting the frequency of the inverter, it can be used to adjust the speed of the main spindle of the CNC machine. It is also beneficial to apply intelligent technology to meet the needs of intelligent motion control. Therefore, sine wave inverter is used in CNC machine tools. This article introduces the application of sine wave inverter on the main spindle of CNC machine tool, and analyzes its advantages, such as energy saving and low noise.
2 Sine Wave Inverter
Sine wave inverter is a frequency conversion device that converts AC or DC voltage into adjustable, stable frequency and voltage alternating current according to a certain algorithm. Generally, it consists of a microprocessor, a rectifier, an inverter and an EMC filter. The rectifier converts the mains AC or DC into a certain DC voltage, and then the microprocessor controls the inverter to generate a certain frequency and voltage AC output by controlling the on and off of the transistor. At this time, the input AC or DC is converted into an adjustable frequency and voltage AC. The sine wave inverter is used to realize the inverter frequency conversion technology such as AC vector drive, AC vector control and DC vector control.
3 Application on CNC Machine Tool
Due to the verifiability and robustness of the sine wave inverter, it has been successfully applied to the main spindle of CNC machine tools for its energy saving and emission reduction characteristics. The AC motor drive system of sine wave inverter can be used to control the speed of CNC machine tools, and has obvious energy saving benefits. The speed regulation range of sine wave inverter is wide and its control accuracy is high, which can meet the high speed requirements of CNC machine tools. The sine wave inverter not only has the characteristics of energy saving and environmental protection, but also reduces vibration and noise, which is important to ensure the control accuracy and stability of CNC machine tools.
4 Advantages of Sine Wave Inverter
The application of sine wave inverter on CNC machine tool has the following advantages (Yu Xueyou, 2001):
（1） Energy saving. With frequency conversion control, the output voltage and frequency of the sine wave inverter can be adjusted according to the motor load. When the load is lighter, the output voltage and frequency can be reduced to reduce the energy consumption of the motor and realize the energy saving effect.
（2） Low noise. The current of the sine wave inverter is smooth, and the ripple and harmonic components are small. The dynamic response of the drive system is fast, which can reduce the current ripple and thus reduce the humming noise of the motor and drive system.
（3） High control accuracy. By using PID principle and PI control method, sine wave inverter can improve control accuracy and speed response, and realize accurate and stable speed control.
（4） Easy maintenance. The microprocessor of sine wave inverter can accurately detect the working state of the drive system and detect the fault in good time, which conveniently provides data support for fault diagnosis and maintenance.
5 Conclusion
Sine wave inverters are AC and DC power conversion devices with high efficiency and good performance that can be used for frequency conversion. This article describes the application of sine wave inverter in CNC machine tools, and analyzes its advantages such as energy saving, low noise and high control accuracy. From the perspective of energy conservation and environmental protection, it has certain social benefits and economic benefits. In short, the application of sine wave inverter on the main spindle of CNC machine tool is conducive to the development of CNC machine tools.
