Servo Inverter Design for High Performance Multi-axis CNC Tube Bending Machine

In this paper, the design of servo inverter used for an industrial application is presented. In boiler component manufacturing processes, high performance machines are often equipped motion controls consisting of synchronous servo motors and servo inverters. The design of important aspects of servo inverter used in a five axis CNC tube machine are explained. The configuration of main stages of the system such as main dc supply unit, servo inverter drives, servo motors etc. are detailed with relevant illustrations. The servo inverters are supplied with a regenerative power supply unit producing main dc power and are controlled by a CNC controller. The calculation of mechanical power for drives, dc bus continuous and peak power, continuous and peak regenerative power, simultaneity factor are well explained in this paper with a real time comparison. A regenerative power supply unit with smart energy mode to reduce current and power peaks on the mains side is also proposed to limit the maximum device current to 1.1 fold value of the nominal current and to achieve energy savings. This paper will be a good guide for project planning for industrial applications using servo inverter systems.