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Diffstat (limited to '1445/CH10/EX10.14/Ex10_14.sce')
| -rw-r--r-- | 1445/CH10/EX10.14/Ex10_14.sce | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/1445/CH10/EX10.14/Ex10_14.sce b/1445/CH10/EX10.14/Ex10_14.sce index 374233cc2..3bed8ce66 100644 --- a/1445/CH10/EX10.14/Ex10_14.sce +++ b/1445/CH10/EX10.14/Ex10_14.sce @@ -1,6 +1,8 @@ //CHAPTER 10- THREE-PHASE INDUCTION MACHINES //Example 14 +clc; +clear disp("CHAPTER 10"); disp("EXAMPLE 14"); @@ -19,34 +21,34 @@ loss=420; //friction and winding loss in Watts I1=I_nl/sqrt(3); //phase current=(line current)/sqrt(3) for delta connection i_sq_r1=(I1^2)*r*3; //stator ((I^2)*R) loss at no load; since resistance is given in per phase, 3 needs to be multiplied for 3-phase s_loss=(p_ni-loss)-(i_sq_r1); -disp(sprintf("(a) The stator core loss is %.1f W",s_loss)); +disp(sprintf("(a) The stator core loss is %f W",s_loss)); //solution (b) I2=I_fl/sqrt(3); i_sq_r2=(I2^2)*r*3; p_g=p_fi-s_loss-i_sq_r2; //air-gap power at full load r_loss=p_g-p; -disp(sprintf("(b) The total rotor loss at full load is %.0f W",r_loss)); +disp(sprintf("(b) The total rotor loss at full load is %f W",r_loss)); //solution (c) o_loss=r_loss-loss; -disp(sprintf("(c) The total rotor ohmic loss at full load is %.0f W",o_loss)); +disp(sprintf("(c) The total rotor ohmic loss at full load is %f W",o_loss)); //solution (d) s_fl=o_loss/p_g; //full load slip N_s=1500; N_r=N_s*(1-s_fl); -disp(sprintf("(d) The full load speed is %.1f rpm",N_r)); +disp(sprintf("(d) The full load speed is %f rpm",N_r)); //solution (e) w=(2*%pi*N_s)/60; T_e=p_g/w; -disp(sprintf("(e) The internal torque is %.2f N-m",T_e)); -T_sh=p/(w*(1-s)); -disp(sprintf(" The shaft torque is %.2f N-m",T_sh)); +disp(sprintf("(e) The internal torque is %f N-m",T_e)); +T_sh=p/(w*(1-s_fl)); +disp(sprintf(" The shaft torque is %f N-m",T_sh)); eff=p/p_fi; -disp(sprintf(" The motor efficiency is %.2f %%",eff*100)); +disp(sprintf(" The motor efficiency is %f %%",eff*100)); //The answers may be slightly different due to precision of floating point numbers -//END +//END
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