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clc
//ex16.4
V_T=240; //dc supply voltage
R_A=0.065; //armature resistance
R_F=10; //field resistance
R_adj=14; //adjustable resistance
n=1200; //speed in rpm
P_rot=1450; //rotational power loss
T_out=250; //hoist torque
I_F=V_T/(R_F+R_adj); //field current
//E_A at I_F and n from magnetization curve
E_A_1=280; //armature voltage
W_m_1=n*2*%pi/60; //speed in radians per second
K=E_A_1/W_m_1; //machine constant
T_rot=P_rot/W_m_1; //rotational loss-torque
T_dev=T_rot+T_out; //developed torque
I_A=T_dev/K; //armature current
E_A_2=V_T-R_A*I_A; //applying KVL
W_m_2=E_A_2/K; //speed in radians per second
n_m=W_m_2*60/(2*%pi); //speed in rpm
P_out=T_out*W_m_2; //output power
I_L=I_F+I_A; //line current
P_in=V_T*I_L; //input power
eff=P_out*100/P_in; //efficiency
printf(" All the values in the textbook are approximated hence the values in this code differ from those of Textbook")
disp(n_m,'Motor speed in rpm')
disp(eff,'Efficiency of the motor')
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