diff options
Diffstat (limited to '1445/CH8/EX8.6/Ex8_6.sce')
| -rw-r--r-- | 1445/CH8/EX8.6/Ex8_6.sce | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/1445/CH8/EX8.6/Ex8_6.sce b/1445/CH8/EX8.6/Ex8_6.sce index 67e4601b2..fc89b9145 100644 --- a/1445/CH8/EX8.6/Ex8_6.sce +++ b/1445/CH8/EX8.6/Ex8_6.sce @@ -1,6 +1,7 @@ //CHAPTER 8- DIRECT CURRENT MACHINES //Example 6 +clc; disp("CHAPTER 8"); disp("EXAMPLE 6"); @@ -17,33 +18,33 @@ I_f=1.6; //field current in Amperes //SOLUTION //solution (i) -E_b=v_t-(I_a*r_a); //Back emf +E_b=v_t-(I_a*r_a); w=(2*%pi*N)/60; //in radian/sec -T_e=(E_b*I_a)/w; //electromagnetic torque -disp(sprintf("(i) The electromagnetic torque is %.0f N-m",T_e)); +T_e=(E_b*I_a)/w; +disp(sprintf("(i) The electromagnetic torque is %f N-m",T_e)); //solution (ii) A=P; //since it is lap winding, so A=P and A=number of parallel paths phi=(E_b*60*A)/(P*N*Z); -disp(sprintf("(ii) The flux per pole is %.3f Wb",phi)); +disp(sprintf("(ii) The flux per pole is %f Wb",phi)); //solution (iii) -//Rotational power= Power developed on rotor - Pshaft.(=Pout) p_rotor=E_b*I_a; //power developed on rotor p_rot=p_rotor-p_o; //p_shaft=p_out -disp(sprintf("(iii) The rotational power is %.4f W",p_rot)); //text book answer is 870 W +disp(sprintf("(iii) The rotational power is %f W",p_rot)); //solution (iv) tot_loss=p_rot+((I_a^2)*r_a)+(v_t*I_f); -p_i=p_o+tot_loss; //input power +p_i=p_o+tot_loss; eff=(p_o/p_i)*100; -disp(sprintf("(iv) The efficiency is %.2f %%",eff)); +disp(sprintf("(iv) The efficiency is %f %%",eff)); //solution (v) -T=p_o/w; //shaft torque -disp(sprintf("(v) The shaft torque is %.0f N-m",T)); +T=p_o/w; +disp(sprintf("(v) The shaft torque is %f N-m",T)); //The answers are slightly different due to the precision of floating point numbers + //END |