m4.m

Gives all the matlab codes for dynamic simulation of electric machinery by Chee-Mun Ong

% M-file m4.m is for Project 4 on universal motor in Chapter 8.
%
% m4.m loads the following machine parameters of dc machine
%  and plots the results of the simulation
% 
Prated = 325;  
Frated = 60; 
wrated = 2*pi*Frated;
Vrated = 120; % rms voltage
Iarated = 3.5 % rms amp
wmrated = 2800*(2*pi)/60; 
Trated = Prated/wmrated;
Ra = 0.6;
Rse = 0.1;
Laq =  0.010; 
Lse = 0.026;
J = 0.015; % rotor inertia in kgm2

%Entering magnetization curve data:

wmo = 1500*(2*pi)/60; % speed at which mag. curve data was taken
% load voltage values of mag. curve
SEVP4 = [-160 -155 -150 -145 -140 -135 -130 -125 -120 ...
 -115 -110 -105 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 ...
10 20 30 40 50 60 70 80 90 100 105 110 115 120 125 130 135 ...
140 145 150 155 160];

% load main field current values of mag. curve 
SEIP4 = [-14.225 -12.275 -10.725 -9.725 -9.100 -8.600 ...
-8.075 -7.650 -7.200 -6.850 -6.492 -6.135 -5.775 -5.112 -4.500 ...
-3.825 -3.275 -2.783 -2.250 -1.688 -1.125 -0.542 0.0 0.542 1.125 ...
 1.688  2.250  2.783  3.275  3.825  4.500  5.112  5.775  6.135 ...
 6.492  6.850  7.200  7.650  8.075  8.600  9.100  9.725 10.725 ...
12.275 14.225 ];

clf; % clear figure
plot(SEIP4,SEVP4); % plot mag curve measured at wmo
axis('square')

% Initialize run condition
Sw4AC = 1 % set switch to use ac supply 
wm0 = 0 % set initial speed to zero to start from standstill  

% Transfer to keyboard for startup simulation
disp('Simulation set up for startup run, perform simulation')
disp('    then enter ''return'' for plots');
keyboard

clf;  % clear figure
subplot(4,1,1)
plot(y(:,1),y(:,2))
title('AC supply voltage')
ylabel('Va in V')
subplot(4,1,2)
plot(y(:,1),y(:,3))
title('Internal voltage')
ylabel('Ea in V')
subplot(4,1,3)
plot(y(:,1),y(:,4))
title('Armature current')
ylabel('Ia in A')
subplot(4,1,4)
plot(y(:,1),y(:,5))
title('Torque')
ylabel('Tem in Nm')
xlabel('time in sec')
disp('Save plots before entering return to continue with load runs');
keyboard

% Initialize run condition
Sw4AC = 1 % set switch to use ac supply 
wm0 = 275; % set initial speed near ss value for load stepping
% Transfer to keyboard for step torque run
disp('Set up for ac fed, step torque run, perform simulation')
disp('    then enter ''return'' for the dc fed case');
keyboard
clf;  
subplot(4,1,1)
plot(y(:,1),y(:,4))
title('Armature current with ac supply')
ylabel('Ia in A')
subplot(4,1,2)
plot(y(:,1),y(:,5))
title('Torque with ac supply')
ylabel('Tem in Nm')

% Initialize run condition
Sw4AC = 0 % set switch to use ac supply 
wm0 = 350; % set initial speed near ss value for load stepping
disp('Set up for dc fed, step torque run, perform simulation')
disp('  then enter ''return'' for plots of both step torque runs');
keyboard
subplot(4,1,3)
plot(y(:,1),y(:,4))
title('Armature current with dc supply')
ylabel('Ia in A')
subplot(4,1,4)
plot(y(:,1),y(:,5))
title('Torque with dc supply')
ylabel('Tem in Nm')
xlabel('time in sec');