Unit 25d: Testing An Induction Motors

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)