# Prelab 5

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Engineering
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The University Of Tennessee At Chattanooga
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Prelab.5 Open-loop Voltage Control of DC Motor
(Author’s Name)
(Institutional Affiliation)

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PRELAB 5
Question 1
a.
armature current
T α I
a
φ
Eb = (PφNZ)/60A
or N = (60AEb)/PφZ
voltage Va
Va = IaRa + Ea = IaRa + KeW
Torque= 300N.m
Wmax Wbase
Drive speed from 0 to 1600
Terminal voltage 0 to 480 V
Current = constant
1600/480
3.3I

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1 Running head: PRELAB 5 Prelab.5 Open-loop Voltage Control of DC Motor (Author’s Name) (Institutional Affiliation) 2 PRELAB 5 Question 1 a. armature current T α Ia φ Eb = (PφNZ)/60A or N = (60AEb)/PφZ speed W(rads/s) voltage Va Va = IaRa + Ea = IaRa + KeW Torque= 300N.m Wmax – Wbase Drive speed from 0 to 1600 Terminal voltage 0 to 480 V Current = constant 1600/480 3.3I 3 PRELAB 5 b. speed beyond base armature voltage= constant= 480 torque 2000rpm given armature voltage is held constant W/(rad/s) Eb = (PφNZ)/60A or N = (60AEb)/PφZ Eb α Nφ or V – IaRa α Nφ or N α (V – IaRa)/φ Question 2 a) DS1104Enc_POS_C1 is used to measure speed in the dSPACE block library. Read access is provided by the block to the delta position and the interface input channel because of the first encoder. Scaled difference in the delta position represents of two successive position. Angle radian from the encoder is multiplied by 2pi/ (encoder line) which 2pi divided by 1000. Open loop system does not give feedback, the feedback nor the production is neither measured but follows the input command irrespective of the output. Handling disturbance in open loop is poorly equipped. 4 PRE ...
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