Application of Sinusoidal Frequency Converter in Spindle of CNC Machine Tool
Posted on

**1. Introduction** Digital Control Machine Tools, commonly known as CNC (Numerical Control) machines, are advanced mechatronic systems that integrate mechanical, electrical, hydraulic, pneumatic, microelectronic, and information technologies. These tools have been in use for over three decades and are widely applied in the manufacturing industry. They offer significant advantages such as high precision, efficiency, automation, and flexibility. The technological level of CNC machine tools and their proportion in the total number of metal-cutting machine tools serve as important indicators of a country's economic development and industrial capability. Taifeng CNC Machinery Co., Ltd. is a Sino-Taiwan joint venture specializing in the production of CNC machinery. Their equipment is used across various industries. Previously, the company relied on imported frequency converters, but now it has gradually transitioned to using the SINE 303 series inverter. This article discusses the application of the SINE 303 series inverter in Taifeng’s TFDC7060, TFDC500, and TFDC650 machine tools.

1

CNC lathes are widely used in industries such as mold making, plastic molds, footwear, watches, eyewear, hardware, trademarks, toys, and handicrafts. They can perform face turning, outer diameter machining, grooving, internal holes, arcs, and tapers at any angle. The spindle system of these lathes uses the SINE 303 series inverter, which ensures smooth and precise control. The SINE 303 series inverter is ideal for controlling the spindle of a CNC lathe. **2. Features of the SINE 303 Series Inverter** 1. Field-oriented current closed-loop vector control, allowing full decoupling of motor variables. 2. Utilizes TI’s latest 32-bit motor control DSP, enabling fast and accurate execution of complex algorithms—making it the first domestic product to adopt this technology. 3. At 0 Hz, the inverter can produce 150% of rated torque, ensuring strong cutting force even at low speeds, suitable for heavy-duty machining. 4. Automatic motor parameter identification ensures system stability and accuracy. 5. Wide speed range from 0 to 600 Hz, meeting the high-frequency requirements of CNC lathes. 6. Automatically tracks load changes and limits output current to prevent overcurrent or short circuit issues. Even during sudden load changes or rapid acceleration/deceleration, the inverter remains stable and reliable. **3. Inverter Wiring Diagram**

2

**4. Parameter Settings**

1

**5. Debugging Results** Practical results have shown that the SINE 303 series high-performance vector inverter fully meets the needs of machine tool spindle control. Its leading magnetic flux algorithm allows for smooth 150% torque output even at low speeds, satisfying diverse machining requirements. It can completely replace traditional rolling bearing spindles, offering a simpler and more compact design, and enabling true stepless speed regulation. The spindle speed is controlled by an external analog signal, allowing different machining processes like roughing and finishing to be performed at varying speeds. The digital control system sends different analog voltage signals to the inverter, achieving the desired speed. Additionally, the start-stop signal is also managed by the numerical control system, increasing automation and extending tool life. **6. Conclusion** Traditionally, CNC machine tool spindles rely on AC servo systems, imported vector control inverters, and specialized motors, which come with high costs. However, the SINE 303 series inverter offers unique performance features such as low starting current, wide speed range, energy efficiency, stability, high precision, strong low-frequency torque, comprehensive protection functions, high reliability, and ease of operation and maintenance. With its excellent cost-performance ratio, the SINE 303 series has rapidly gained popularity in CNC applications.

Kraft Paper Tape

Kraft Paper Tape,Brown Paper Tape,Reinforce Kraft Paper Tape,Kraft Paper Tape With String

Dongguan Guanhong Packing Industry Co., Ltd. , https://www.tapegh.com