Im.m
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- % ANALYSIS OF THE EQUIVALENT CIRCUIT
- % OF A THREE-PHASE INDUCTION MOTOR
- %
- % The equivalent circuit can be used to determine the operating
- % characteristics an induction motor. Among the important aspects
- % in the steady-state are the variation of current, power, losses
- % and torque associated with various operating conditions. Upon
- % entering the parameters of the equivalent circuit, performance
- % characteristics are obtained for the specified slip and the torque
- % slip curve is plotted on the screen.
- %
- % Copyright (C) 1998 by H. Saadat
- j = sqrt(-1);
- Vm = input(' Enter stator L-L Voltage in Volts, V = ');
- f = input(' Enter stator frequency in Hz, f = ');
- P = input(' Enter number of poles, P = ');
- R1 = input(' Enter stator resistance/phase in ohms, R1 = ');
- X1 = input(' Enter stator reactance/phase in ohms, X1 = ');
- R2 = input(' Enter rotor resistance/phase in ohms, R2'' = ');
- X2 = input(' Enter standstill rotor reactance/phase in ohms, X2'' = ');
- Z1 = R1 + j*abs(X1);
- Z2s= R2 +j*abs(X2);
- Rc = input(' Enter shunt resistance/phase in ohms (if neglected enter inf), RC = ');
- Xm = input(' Enter shunt reactance/phase in ohms (if neglected enter inf). Xm = ');
- Xm=j*abs(Xm);
- S=999;
- while S > 1 | S <= 0
- S = input(' Enter the value of slip in per unit, s = ');
- if S > 1 | S <= 0
- fprintf(' S must be equal or less than 1 but greater than 0 '), else, end
- end
- if S ~= 1
- Prot = input(' Enter rotational and stray load losses in Watts, Prot = ');
- else, Prot = 0; end
- imsol
- imchar
- res = 'y';
- while res == 'Y' | res == 'y'
- fprintf('n Would you like performance characteristics for another slip?')
- res = input(' Enter ''Y '' or ''n'' within quotes --> ');
- if res == 'Y' | res == 'y'
- S = 999;
- while S > 1 | S <= 0
- S = input(' Enter the value of slip in per unit, s = ');
- if S > 1 | S <= 0
- fprintf(' s must be equal or less than 1 but greater than 0 '), else, end
- imsol
- imchar
- end
- else, end
- end