University of Baghdad College of engineering Ele . & Com. Dept. 3 rd Year Matlab. Report of. POSITION AND SPEED CONTROL SYSTEM. Part I Part II. By Ahmed Alaa. Position and Speed. Objectives.
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College of engineering
Ele. & Com. Dept.
POSITION AND SPEED CONTROL SYSTEM
By Ahmed Alaa
The general characteristics of a closed loop system provided by speed and position control for an electric motor using MATLAB
What is the benefits of using feedback paths in control system, is it good to increase the feedback paths in these systems ? Why ?
Derive the overall transfer function of the position control CLS from the basic equations.
the most important advantages is available when negative feedback used
increasing stability , bandwidth
and for +ve feedback ; an oscillation is probably occurs when BA=1
if we increased the number of feedback paths , a great stability is composed with this case but with an increasing noise i.e if the number of passive elements is increased in a circuit a noise will happen
For a CLS:
A is OLTF for fig 2-b
KA is the preamplifier gain
Om is the gear unit gain
What is the effect of changing the values of KA and K1 on the response of the positioncontrol system?
Reason out why the error decreases as the system gain increases in speed control system
Increasing k1 will increase Tsi.e the time is taken by system to reach its steady state is increased ; if k1=0 i.ef.b path removed . An oscillation is occurred before the system reaches steady state ; increasing KA will increase the Mp (max. %OS)
Increasing KA if K1 exists make no difference
For KA=1 ; K1=0 For KA=3 ; K1=0
For KA=10 ; K1=1
System gain k is directly proportional with error constant i.eKv
Kv=limskG(s) as s approaches 0
Hence the error will decrease if k increased
Compare between the theoretical and practical results for both systems and comment on your results.
For step II
Ts=4/zWn; z=0.5 and Wn=1
Ts=8 sec [equal to the practical]
from these experiments we found that k of feedforward of a system with unity one path feedback will affects the Mp .. Oscillation is increased when k is increased ; the other k i.e of feedback is affects the o/p magnitude . Unity case is preferred for control systems . Adding another path of feedback will increase the stability . Adding with a value of k ( of the feedback) will decrease Ts.( for procedure step 1)
Mp,Ts,Tp and Tr remains constant even if we increased the final value of a step i/p