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Old 2nd August 2013, 03:50 AM   #1
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Default Inductor Computation

Hello There,

Could Anyone please show me how to make inductors and computations?
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Old 2nd August 2013, 05:04 AM   #2
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Could you please expand on what you are trying to make ? There are inductors and there are INDUCTORS.

The requirements of a crossover inductor are very different to a choke for a power supply for example.
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Old 2nd August 2013, 05:11 AM   #3
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im sorry, but its air core inductor for power amp output. thanks
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Old 2nd August 2013, 12:24 PM   #4
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Try Googling - Wheeler's Formula.
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Old 7th August 2013, 11:55 AM   #5
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I used this formula for air-core coils from the 1936 Edition of Electrical Engineers' Handbook (Pender Mcilwain). A scan of the page is attached below.

If you have a way to run GWBasic in your PC you can use the following BASIC program which I wrote in early nineties to compute the number of turns, length and weight of the copper wire you need. Fairly accurate. (You have to input the diameter of the wire in inches, taken from a SWG or AWG table). Eg., SWG-18 is 0.048 inches dia., which is the default if you don't input a value.
************************************************** ********
300 INPUT "INDUCTANCE (MICRO H)?", LR
310 INPUT "Wire diameter(inches)?",D
320 IF D=0 THEN D=.048: PRINT "WIRE 18 SWG (DIA=.048 INCH)"
330 NL=1
340 REM D1=DIA OF FORMER
350 PRINT "DIAMETER OF FORMER, IN INCHES (DEFAULT: 1 INCH.)";
360 INPUT D1
365 IF D1=0 THEN D1=1
370 REM B=LENGTH OF WINDING
380 PRINT "LENGTH OF COIL, IN INCHES (DEFAULT: 1 INCH.)";
390 INPUT B
395 IF B=0 THEN B=1
400 R=D1/2
410 REM A=MEAN RADIUS OF COIL
420 A=R+((NL*D)/2)
430 REM c=depth of winding
440 C=NL*D
450 N=NL*(1/(D+.001))*B
460 L=(.8*(A^2)*(N^2))/((6*A)+(9*B)+(10*C))
470 GOTO 620
480 NL=NL+1
490 IF L>=LR GOTO 510
500 GOTO 400
510 N1=SQR((LR*((6*A)+(9*B)+(10*C)))/(.8*(A^2)))
520 PRINT INT(N1+.5);"turns"
530 PRINT"depth of winding=";C;"inch
540 PRINT "length of wire=";TL;" inches"
550 REM METRIC CONV.
560 RM=(D/2)*2.54
570 TLM=TL*2.54
580 VOLM=PI*(RM^2)*TLM
585 REM Specific gravity of copper=8.92
590 WC=VOLM*8.92
600 PRINT "weight of copper=";WC;"gms"
610 END
620 REM
630 PI=3.1416
640 R1 = R +(D*NL)-(D/2)
650 LC= 2*PI*R1
660 LL=LC*(B/D)
670 TL= TL +LL
680 GOTO 480

***********************************************

John
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