Control of position or direction

GPHYSICS G05Controlling systems G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES

G05D3/00Control of position or direction

G05D3/10without using feedback G05D3/105Solar tracker G05D3/12using feedback G05D3/121using synchromachines (selsyns) G05D3/122without modulation G05D3/124with modulation G05D3/125using discrete position sensor G05D3/127with electrical contact G05D3/128using clutch or brake G05D3/14using an analogue comparing device G05D3/1409with dc amplifier chain G05D3/1418with ac amplifier chain G05D3/1427with non-linear amplifier chain G05D3/1436with fine or coarse devices G05D3/1445with a plurality of loops G05D3/1454using models or predicting devices G05D3/1463using PID devices G05D3/1472with potentiometer G05D3/1481with discrete position sensor G05D3/149with clutch or brake G05D3/16whose output amplitude can only take a number of discrete values G05D3/165using clutch or brake G05D3/18delivering a series of pulses G05D3/183using stepping motor G05D3/186using clutch or brake G05D3/20using a digital comparing device G05D3/203using fine or coarse devices G05D3/206using clutch or brakes