Unit 25d: Testing An Induction Motors
Автор: Supplemental Learning Materials
Загружено: 2021-06-20
Просмотров: 386
In video, we will discuss the measurement methodologies specific to inductor motors. We will focus on DC Test, Locked Rotor Test, and No-load Test.
In addition, we have included an example in the video.
The following is the Matlab/Octave program which will convert the input data into the equivalent circuit model of an induction motor:
%
% Enter the rated information, including the line voltage
and line current here.
%
vline=460;
iline=57.8;
f=60;
syms r1 r2 x1 x2 xm rc xt real
%
% Enter the DC Test Data
%
vdc=12;
idc=59;
%
% Enter the locked rotor test data
%
plr=2573.4;
vlr=36.2;
ilr=58;
flr=15;
%
% Enter the no-load test data
%
vnl=460;
inl=32.7;
pnl=4664.4;
x1_to_xt=0.4;
%
% DC Test
%
r1 = vdc/idc/2
eqn1 = plr == 3* ilr^2* (r1+r2);
[r2] = solve(eqn1, r2);
r2 = double(r2)
%
% Locked Rotor Test
%
zlr = vlr/sqrt(3)/ilr;
xt = sqrt(zlr^2- (r1+r2)^2);
xt = xt*f/flr;
x1 = double(x1_to_xt*xt)
x2 = double((1-x1_to_xt)*xt)
%
% No Load Test
%
vph=vnl/sqrt(3);
theta = acos( pnl/3/vph/inl);
i1= inl*exp(-i*theta);
e2= vph-i1*(r1+i*x1);
yy = i1/e2;
rc = 1/ real(yy)
xm = 1/ imag(yy)
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