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//===========================================================================
//chapter 7 example 9
clc;clear all;
//variable declaration
Np = 500; //number of turns on moving coil
Ip = 0.05; //current through moving coil in A
B = 0.012; // flux density in the air gap in T
d = 0.03; //diameter in m
theta1 = 30;
theta2 = 90;
x = 0.866; //power factor cos(phi)
//calculations
A = (%pi/4)*(d^2); //area of x-section of moving coilin m^2
phimax = B*A; //maximum flux through moving coil in Wb
//Mmax = (phimax*Np)/Ic
//Mmax*Ic = X = phimax*Np
X = (phimax*Np);
//T = Ip*Ic*Mmax*cos(phi)*sin(theta)
//T = Ip*Ic*(X/Ic)*cos(phi)*sin(theta)
//T = Ip*(X)*cos(phi)*sin(theta)
T1 = Ip*X*x*sin(theta1*%pi/180);
T2 = Ip*X*x*sin(theta2*%pi/180);
//result
mprintf("torque in when 30° = %3.4e N-m",T1);
mprintf("\ntorque in when 90° = %3.4e N-m",T2);
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