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Registered Member #29
Joined: Fri Feb 03 2006, 09:00AM
Location: Hasselt, Belgium
Posts: 500
Wayne, You are pretty much correct, except it is often more useful to specify Weber/(Ampere-turns) since the flux-current-inductance relationship looks like
L*I=N*F
where L=inductance, I=amperes, N=# turns and F=flux (Webers, V-seconds or Tesla-m^2)...
Registered Member #157
Joined: Sun Feb 12 2006, 08:00PM
Location:
Posts: 76
Ive never had to deal with inductance before, i was just curious as to how to find it. Specifically concerning something like a transformer, i wouldent know the number of turns. What do i do in that case?
Registered Member #79
Joined: Thu Feb 09 2006, 11:35AM
Location: Arkansas
Posts: 673
GODSFUSION wrote ...
Ive never had to deal with inductance before, i was just curious as to how to find it. Specifically concerning something like a transformer, i wouldent know the number of turns. What do i do in that case?
- Wayne -
Easy. First you find the impedance, basically the 'AC resistance', by running a low AC voltage through it and measure the current draw. Let's say you use 12VAC, and you read 1A.
Using Ohm's AC law, V=IZ, we compute: 12V=1A*Z Z=12 ohms
Now, we use the formula: (2)(pi)(f)(L) = Z Z is 12 ohms, and f is the frequency of the 12VAC which in my case is 60Hz. Solve: 12 Ohms = (2)(pi)(60)(L) Inductance = 31.85 mH
BTW, usually the # of turns on the primary of an MOT is between 100 and 120. Inductance usually varies between 7-30something mH with MOT ballasts. (Quick check with my LCR)
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Inductance calculation.
Inductance usually varies between 7-30something mH with MOT ballasts. (Quick check with my LCR)