New brushless AC servo drive uses isolated gate bipolar power transistors and a CPU, to obtain high dynamic performance with exceptionally high reliability and efficiency

Abstract

A brushless AC servomotor drive has been developed to take advantage of the higher efficiency of IGBT transistors and a novel method for continuous torque-angle compensation in two directions. The drive employs CPU management to provide an extensive array of protection functions. The authors present the philosophy, theory and principles behind this innovative approach to AC servo-drive design and discuss the current loop, current-sensor closed loop, velocity loop, and the performance and protection functions built into the drive.<>