Observer based stator flux oriented vector control of cycloconverter-fed synchronous motor drive

A 6-pulse noncirculating current cycloconverter-fed synchronous motor with stator flux oriented vector control for high power and low speed applications is discussed here. Vector control is achieved by stator flux estimation through a novel closed loop reduced order observer robust to speed variation. Variable displacement factor operation is incorporated to keep both the system current continuous and system utilisation optimum. A simple method is used for armature current regulation with good performance. A generalized digital simulation of the drive system is made and the simulation results are validated by a practical implementation of the drive with a 386DX-387 based system