PHASE LOCKED DC MOTOR REGULATORS
Abstract
THE PRESENT THESIS IS A THEORETICAL AND EXPERIMENTAL INVESTIGATION OF THE APPLICATION OF THE PLL PRINCIPLE TO DC MOTOR SPEED CONTROL; SEPARATELY EXCITED ANDSERIES MOTORS ARE CONSIDERED. THESE SYSTEMS WHICH WILL BE REFERRED TO AS PLRS(PHASE LOCKED REGULATION SYSTEM) FIRSTLY APPEARED IN LATE 1960S BUT HITHERTO THERE HAS NOT BEEN A SATISFACTORY THEORETICAL ANALYSIS RESULTING THUS IN A GAPBETWEEN THEORY AND PRACTICE. IN THIS THESIS PLRS WITH TRIANGULAR AND PHASE- FREQUENCY COMPARATOR HAVE BEEN INVESTIGATED. FOR THE TRIANGULAR PHASE COMPARATOR A NEW, SIMPLE, MORE EFFICIENT MODEL IS PROPOSED HERE. THIS HAS BEEN EMPLOYEDIN THE INVESTIGATION OF THE CAPTURE PHENOMENON. EXPERIMENT HAS SHOWN THAT CAPTURE IS ATTAINED MAINLY THROUGH THE LOCK-IN PROCESS. THE DELAY INTRODUCED BY THE MOTOR PREVENTS THE PULL-IN PROCESS FROM BEING EFFECTIVE. BASICALLY THE LOCK-IN PHENOMENON IS ISOLATED IN A PLRS. BY MEANS OF THE PROPOSED MODEL A CLOSEDEXPRESSION FOR THE ESTIMATION OF THE LOCK-IN RANGE HAS B ...
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