Induction Motor Matlab Report

# Induction Motor Matlab Report - ECE 3354 Power Systems...

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ECE 3354 – Power Systems Laboratory Experiment MATLAB Induction motor: Three Phase Induction Machines Date of Experiment October 29 th , 2009

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Objective The objective of this experiment is to explain the operation and performance of the squirrel-cage induction motor and how to interpret test data on the motor to derive the equivalent circuit. Information from these tests, and the respective circuit can be used to produce plots that show valuable information about RPMs and torque of the motor under different conditions. 1. Derive an equivalent circuit like Figure 5 for the tested machine. Assume a NEMA “D” motor. X1 = X2 in the equivalent circuit. Equations used for derivation: SLIP =( SPEED syn – SPEED m ) / SPEED syn for one phase Rsc = Psc / I 2 SC Xsc = Q SC / I 2 SC R 1 = 2.3Ώ R2=Rsc – R1 X1 = X2 = Xsc / 2 pf = P/S Z1 = R1 + J X1 Vcore = Voc –( Ioc)(Z1) Pcore =Poc – R1(Ioc 2 ) Qcore= Qoc – X1(Ioc 2 ) Rc = (Vcore) 2 / Pcore Xm = (Vcore) 2 / Qcore
Derivation of Equivalent Circuit: = . R1 2 3 Ω = . . = . Rsc 30 12 52 4 816 Ω = - = . R2 Rsc R1 2 516 Ω = . . = . Xsc 25 422 52 4 06 Ω = = = . X1 X2 Xsc2 2 03 Ω = . + . Z1 2 3 j2 03 Ω = . - . . + . = . - . = . Vcore 54 41 2 032 3 j2 03 49 74 j4 12 49 91 V = . Pcore 29 52 W = . Qcore 94 97 VAR = = . Rc Vcore2Pcore 84 38 Ω = = . Xm Vcore2Qcore 26 23 Ω Equivalent Circuit: 2. Plot the output torque vs. speed and current I 1 vs. speed from the experiment data. Note: Plot the three different voltage cases for

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1520 1540 1560 1580 1600 1620 1640 1660 1680 1700 1720 . 0 9 1 . 1 1 . 1 2 . 1 3 . 1 4 . 1 5 Speed (RPM) Torque Plot of Torque vs. Speed torque on the same plot. Plot the three different voltage cases for current I 1 on the same plot. Include plots. >> torque100 = [0.92 1.02 1.14 1.26 1.34 1.45];
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## This note was uploaded on 11/07/2009 for the course ECE 3354 taught by Professor Cooper during the Fall '08 term at Virginia Tech.

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Induction Motor Matlab Report - ECE 3354 Power Systems...

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