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Registered Member #503
Joined: Sun Nov 19 2006, 06:37PM
Location:
Posts: 59
A bit of a basic query :
Suppose I have a ferrite transfomer , is it right to find the start and end of the coils using an L meter ? For example if L1 is inductance of one coil and L2 is the other. End of L1 connected to start of L2 will give me a net value of L1+L2. End of L1 connected to end of L2 will give me L1-L2 ? Is this a valid way to check ?
Registered Member #816
Joined: Sun Jun 03 2007, 07:29PM
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Posts: 156
Couldn’t you connect one winding to a sig generator as well as a scope probe for ch1 in parallel, then attach the ch2 scope probe’s to the other winding’s in turn and look for in phase or anti-phase condition.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Broadly speaking the idea is correct. You will measure more inductance when the two windings are in phase, than when they are out of phase.
But you don't measure L1+L2, L1-L2, because of the mutual inductance between them.
Another way of saying that is that the inductance is proportional to the square of the turns, so connecting two equal transformer windings in series-aiding gives 4 times the inductance of a single winding, not twice.
I think in series-opposing you basically just get twice the leakage inductance: nearly zero.
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Finding start and end of coils.
