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3 13.10.2007 .


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1.

1. (. .. ) - (ز) GBT .

 

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() U .() R . . () L .. () ³ . . γ = t/
      1.2   0.8
      1.4   0.9
      1.6   0.8
      0.8   0.8
          0.9
      1.5   0.85
      2.0   0.7
      2.0   0.9
      1.5   0.9
      1.0   0.8
      1.2   0.9
      1.5   0.85
      2.0   0.8
      2.5   0.75
      3.0   0.75
      3.5   0.9
      2.5   0.8
      2.5   0.9
      3.0   0.8
      2.0   0.9
      2.5   0.85
      3.5   0.75
      2.5   0.8
      2.0   0.85
      3.0   0.9
      3.0   0.9
      2.0   0.8
      2.5   0.75
      4.0   0.8
      3.5   0.8

 

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JGBT . LR- . . ..1

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, , ز. / IGBT IRG4BC20 FD . D 67-standard.

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..2

( ), .. () =10.

 

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. t0 C = 850C.

t0..C = 350C.

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α =7 /2.

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, , c =5 .

b = 50÷70 .

, h = 25 .

2.

L = 70 ÷ 100 .

4.

 

4.1 ( .).

 

Rth = (t0 - t0..)/ . = (85 -35) / 10 = 5 ./.

 

4.2 .

 

S. = 1/ (α * Rth) = 1/(7*5) =0.0285 2 = 285 2

 

4.3 b = 60 .

4.4 c = 6 . 1 = 8 .

4.5 ֳ , N = b/c1 +1 = 60/8 +1 = 8.

4.6 h =20 . :

 

ΣS = N* (2*h*L);

 

L = 80 , :

 

ΣS (2) = 8*(2*2*8) = 256 2.

 

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.23.

 

, . ( ) (-46, 40) Y. " " , . " " , (" " " "), (" "). " ". " " " ". " 01". . . D = 4,5

5 /. .

 
 

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..34

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' , : " " " ". " " " 2.m3d 2 ", .(..36).

.. 36

 

 
 

ϳ (. 37):

 

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..56

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ﳿ , -3D V8 +.

 

 



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