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Laboratory Report No: 05 Experiment Name: Closed loop DC motor drive Name of the Instructor: odule Code: EE 500! odule "itle: #o$er Electronics Date of %ubmission: &5'0&'&0()
Closed Loop DC otor Drive
*im To To study speed control control performance performance of a DC drive (i) (i) (ii) (ii)
Agains Agai nstt load load vari variat atio ion n iin n the the ste stead ady y sta state te Agai Ag ains nstt loa load dv var aria iati tion on in in the the tran transi sien entt sta state te
#rocedure
a+ %teady state characteristics (i) (ii)
Connect the circuits as shown in g 05. eep the speed!set dial and the tor"ue dial on the #eonard panel at $ero positions. %witch on power& and for di'erent settings of speed!dial vary the load!tor"ue in steps and otain readings for speed& armature current and armature voltage. eep armature current within 5A when change the load.
b+
"ransient characteristics (i)
or each setting of the speed dial& ad*ust load tor"ue for +a , 5A& and otain readings for speed (-)& armature voltage (a)& ra/e coil current (+ra/e) and input current (+in). Then switch o' % to cuto' load tor"ue and oserve transient variation of speed on the oscilloscope. Also otain readings for +a& -& a and +in in the steady state.
ig (ii)
01
Transient variation waveform of speed or three di'erent settings of the speed dial& ad*ust load tor"ue for +a of 2A and cut o' the load. 3ait for motor to staili$e its speed and then switch on the load instantly. 4serve and s/etch the transient variation of the speed.
ig 01 Transient variation waveform of speed! for speed dial 60
ig 061 Transient variation waveform of speed! for speed dial 20
ig 021 Transient variation waveform of speed! for speed dial 50
Evaluation , Discussion
(i)
Draw graphs of speed (-) vs armature current (+a) for steady state operation and comment on their shape.
ig 051 %peed (-) vs armature current (+a) waveform
(ii)
Discuss the e'ects on speed response due to load disturances oth in the transient and steady states. During load disturances& due to delay in the system& speed recovers only after undergoing some form of short transient. The nature of transient can e changed y varying the parameters of the speed and the current controllers. 3hen the load tor"ue of the motor increases the speed responses also get increases to compensate the motor tor"ue e"uali$e the load tor"ue. The speed is corrected at the ma7imum permissile armature current until the speed error ecomes either smaller or $ero.
