Given a model of the speed control for the electric motor in an electric powered vehicle with a unity-feedback loop: D(s) G (s) (s² + 4s + 5) G(s) : (s + 1)(s +2)(s+3) D(s) = K (K>0 ) a) If K = 1, what is the steady-state error of the closed-loop system ess for a unit-step input? What types of compensators could we use (name at least 2) to reduce eșs to below some specified percentage (say 1%)? Briefly discuss pros/cons of using those types of compensators for this system (and in general) – in 1 or 2 sentences. If we used a lag-compensator, would we be able to reduce ess to unit-step input to 0? What type of compensator would we have to use to guarantee steady-state error ess to unit-step input is 0? b) What part of the real-axis belongs to the root-locus of this system when K is varied from O to infinity? c) Derive the asymptotic angles for the root-locus branches that end in infinity

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Problem 1e) should say (ignore the part about complex-conjugate poles/zeros ) : 

Setup the equation to determine breakaway/break-in points of the root locus 

 

Given a model of the speed control for the electric motor in an electric powered vehicle with a
unity-feedback loop:
D(s)
G (s)
(s² + 4s + 5)
G(s)
(s + 1)(s +2)(s + 3)
D(s) = K (K >0)
a) If K = 1, what is the steady-state error of the closed-loop system ess for a unit-step
input? What types of compensators could we use (name at least 2) to reduce ess to below
some specified percentage (say 1%)? Briefly discuss pros/cons of using those types of
compensators for this system (and in general) – in 1 or 2 sentences.
If we used a lag-compensator, would we be able to reduce ess to unit-step input to 0?
What type of compensator would we have to use to guarantee steady-state error ess to
unit-step input is 0?
b) What part of the real-axis belongs to the root-locus of this system when K is varied from
O to infinity?
c) Derive the asymptotic angles for the root-locus branches that end in infinity
d) Determine the departure/arrival angles for the appropriate branches of the root-locus.
e) Setup the equation to determine breakaway/break-in points of the root locus related to
complex conjugate poles/zeros (do not solve!)
f) For what values of K will the closed-loop system be stable?
g) Sketch the root-locus (assume break-away point is at approximately s= -1.5,
Transcribed Image Text:Given a model of the speed control for the electric motor in an electric powered vehicle with a unity-feedback loop: D(s) G (s) (s² + 4s + 5) G(s) (s + 1)(s +2)(s + 3) D(s) = K (K >0) a) If K = 1, what is the steady-state error of the closed-loop system ess for a unit-step input? What types of compensators could we use (name at least 2) to reduce ess to below some specified percentage (say 1%)? Briefly discuss pros/cons of using those types of compensators for this system (and in general) – in 1 or 2 sentences. If we used a lag-compensator, would we be able to reduce ess to unit-step input to 0? What type of compensator would we have to use to guarantee steady-state error ess to unit-step input is 0? b) What part of the real-axis belongs to the root-locus of this system when K is varied from O to infinity? c) Derive the asymptotic angles for the root-locus branches that end in infinity d) Determine the departure/arrival angles for the appropriate branches of the root-locus. e) Setup the equation to determine breakaway/break-in points of the root locus related to complex conjugate poles/zeros (do not solve!) f) For what values of K will the closed-loop system be stable? g) Sketch the root-locus (assume break-away point is at approximately s= -1.5,
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