OBSERVER-BASED STATOR-FLUX-ORIENTED VECTOR CONTROL OF CYCLOCONVERTER-FED SYNCHRONOUS MOTOR DRIVE

A six-pulse noncirculating-current cycloconverter-fed synchronous moto r with stator-flux-oriented vector control for high-power and low-spee d applications is discussed here, Vector control is achieved by stator flux estimation through a novel closed-loop reduced-order observer ex hibiting stable speed regulation. Variable displacement factor operati on is incorporated to keep both the system current continuous and the system utilization optimum. A simple method is used in designing the c ontroller for armature current regulation with good performance. A gen eralized digital simulation of the drive system is made, and the simul ation results are validated by a low-cost laboratory implementation of the drive with a 386DX PC-based system with 80387 floating point supp ort.