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authorprashantsinalkar2017-10-10 12:27:19 +0530
committerprashantsinalkar2017-10-10 12:27:19 +0530
commit7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 (patch)
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parentb1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff)
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+clc;
+P=60000; // rated power of 3-phase induction motor
+p=4; // number of poles
+f=50; // frequency
+po=3000; // no load losses
+i=0.3; // ratio of rated current to rated voltage when motor is prevented from rotating
+pi=4000; // power input when motor is prevented from rotating
+pr=0.3; //ratio of mechanical losses to no load losses
+pm=pr*po; // mechanical losses
+lsc1=po-pm; // stator core loss
+lsc2=pi/2; // stator copper loss=rotor copper loss
+disp('case a');
+pg=P+pm+lsc2; // air gap power
+s=lsc2/pg;
+printf('Slip at rated load is %f\n',s);
+disp('case b');
+pim=pi/i^2; // power input to motor during blocked rotor test
+pg=pim-lsc1-lsc2; // air gap power
+ws=(4*%pi*f)/p; // synchronous speed
+T=pg/ws;
+printf('Starting torque at rated applied voltage is %f Nm\n',T);