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author | priyanka | 2015-06-24 15:03:17 +0530 |
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committer | priyanka | 2015-06-24 15:03:17 +0530 |
commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
tree | ab291cffc65280e58ac82470ba63fbcca7805165 /1445/CH8/EX8.30/Ex8_30.sce | |
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initial commit / add all books
Diffstat (limited to '1445/CH8/EX8.30/Ex8_30.sce')
-rw-r--r-- | 1445/CH8/EX8.30/Ex8_30.sce | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/1445/CH8/EX8.30/Ex8_30.sce b/1445/CH8/EX8.30/Ex8_30.sce new file mode 100644 index 000000000..782ad08af --- /dev/null +++ b/1445/CH8/EX8.30/Ex8_30.sce @@ -0,0 +1,26 @@ +//CHAPTER 8- DIRECT CURRENT MACHINES +//Example 30 + +disp("CHAPTER 8"); +disp("EXAMPLE 30"); + +//Series DC motor 5 HP with 100 rpm +//VARIABLE INITIALIZATION +p=5*735.5; //in Watts (1 metric H.P.=735.5 W) +N=1000; //in rpm, given as 100 rpm but solved as 1000 rpm in the text book + //hence taken 1000 rpm +I=30; //in Amperes +I_s=45; //starting current in Amperes + +//SOLUTION +T=(p*60)/(2*%pi*1000); // Torque +//Torque dir prop phi.Ia +//=> since phi dir prop Ia +//=> torque dir prop Ia^2 +// starting torque T_s / T = Starting current Ia ^2 / I^2 +T_s=(T*(I_s^2))/(I^2); +disp(sprintf("The starting torque is %.0f N-m",T_s)); + +//The answer is slightly different due to precision of floating point numbers + +//END |