A phase-locked regulator system study of a separately excited DC motor with phase-frequency comparator

Abstract

A phase-locked regulator system (PLRS) of separately exoited 1)C motors with e phase-frequency oomparator ia theoretically and experimentally atudied. For the phaao-frequency comparator a new non-linear but aimple model which explains the syatem behaviour very well is introduecd. System neyrnptotio stnbility is proved theoretically and stability eriterin era given. The effect of input ehangea on system performance is quanlitstively described. Finally it is ahown that thq thearctienl results are in very good agreement with measurements obtained from an actual system on the basis of whioh some practical design aspects am dirussed. Amplifier gain Motor viscous coefficient Locking r a n g e Mean PFC o u t p u t value P h a s e error Motor c u r r e n t i l l o m e r~t of i n e r t i a Motor d a m p i n g f a c t o r Systen~ d a m p i n g fact,or PFC gain Motor velocity constant, Motor t o r q u e c o n s t a n t A r m a t u r e i n d u c t a n c e Encoder resolution A r m a t u r e resistance Lag-filter z e r o 1.ng-filter pole Load t o r q u e M o t o r mechanical t i m e constant Motor elect'rical t i m e constant I'uwer s u p p l y voltage Filter capacitor voltage M o t o r mechanical velocity Reference f r e q u e n c y Feedback frequency M o t o r n a t u r a l frequency S y s t e m n a t u r a l frequency Faculty of Engineering, University of Thessaloniki. w:o-m71sels-az 0141 8or.m o 1882 ~n y l n r d ~r s t w i~ 1.4d Downloaded by [USC University of Southern California] at