Application of Sunwoele VFD (Variable-frequency Drive) in CNC machine tool spindles

1. Introduction

Numerical control machine tools, referred to as CNC machine tools (NC, Numerical Control), are electromechanical products that have been comprehensively applied over the past thirty years to integrate mechanical, electrical, hydraulic, pneumatic, microelectronics and information technologies. They are used in machinery manufacturing equipment. It has the advantages of high precision, high efficiency, high automation and high flexibility. The technical level of CNC machine tools and their percentage in metal cutting machine tool output and total ownership are one of the important indicators for measuring the development of a country's national economy and the overall level of industrial manufacturing.

Taifeng CNC Machinery Co., Ltd. is a Sino-Taiwan joint venture specializing in CNC machinery manufacturing. The CNC equipment it produces is widely used in many fields. Originally, all the company's machine tools used imported VFD (Variable-frequency Drive), and now it has gradually adopted Sunwoele HSF600 series VFD (Variable-frequency Drive).

This article mainly introduces the application of HSF600 series VFD (Variable-frequency Drive) in the company's TFDC7060 machine tool, TFDC500 machine tool, TFDC650 and other machine tools.

This CNC lathe is suitable for processing in the engraving mold industry, plastic mold industry, shoemaking industry, watchmaking industry, glasses industry, hardware industry, trademark industry, toy industry, handicraft industry, etc. It can realize end faces, outer circles, grooving, and inner cutting. Turning of holes, arcs, tapers at any angle, etc. The lathe spindle adopts HSF600 series VFD (Variable-frequency Drive).

HSF600 series VFD (Variable-frequency Drive) easily completes CNC lathe spindle transmission control.

2. HSF600 series VFD (Variable-frequency Drive) features

1). Magnetic field oriented current closed-loop vector control, motor variables are completely decoupled.

2). It adopts the latest high-performance 32-bit motor control dedicated DSP from TI Company in the United States to complete complex control algorithms at high speed and accuracy. It is the first product application in China.

3). The starting torque can reach 150% of the rated output at 0HZ, which fully meets the needs of CNC lathes and ensures that the machine tool has strong cutting force during low-speed heavy cutting.

4). The automatic identification function of motor parameters can identify motor parameters online to ensure the stability and accuracy of the system.

5). The speed regulation range is 0~600.00Hz, which fully meets the high-frequency requirements of CNC lathes.

6). Automatically track load changes and automatically limit the output current so that it does not exceed the maximum allowable current value. Even if the load changes suddenly and accelerates and decelerates rapidly, the VFD (Variable-frequency Drive) will not suffer from overcurrent, short-circuit or other faults, achieving high performance and high reliability of the VFD (Variable-frequency Drive) configuration. The response is fast and stable during high-speed shutdown.

3． VFD (Variable-frequency Drive) wiring diagram

4． Parameter settings

5. Debugging results

Facts have proved that the use of HSF600 series high-performance vector VFD (Variable-frequency Drive) can fully meet the requirements of machine tool spindle control. The leading magnetic flux algorithm adopted by HSF600 can smoothly output 150% torque even at low speed (low frequency) to meet the processing needs of different parts. It can completely replace the traditional rolling bearing spindle structure, and the spindle structure is simple , compact, and can achieve true stepless speed regulation. The rotation speed of this spindle is controlled by an external analog signal. Different rotation speeds are required in different machining processes (such as rough machining, finishing machining, etc.). At this time, the CNC system can output different analog voltage signals to the VFD (Variable -frequency Drive) to achieve different speeds, and the start and stop signals are also controlled by the CNC system, which improves the degree of automation and extends the service life of the tool.

6． Conclusion

CNC machine tool spindles generally use AC servo systems, imported brand vector control VFD (Variable-frequency Drive) and frequency conversion special motors, which are very expensive to purchase; HSF600 series VFD (Variable-frequency Drive) has its unique performance (small starting current, adjustable Smooth speed, large speed range, energy saving and environmental protection, stable operation, high precision, large low-frequency torque, complete protection functions, high reliability, easy operation and maintenance, etc.) and superior cost performance, it has rapidly emerged in the application of CNC machine tools.