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inductor winding

J

Jamie Morken

Jan 1, 1970
0
Hi,

I wound a test inductor using litz wire and a ferrite core, one layer of
wire on the bobbin, now I realize there is still enough room for adding
another layer of wire. I would like to keep the same number of turns,
is it ok to wind the next layer on top of the first, in parallel with
the first layer? The reason I ask is the second layer will have a wider
loop of copper, and thus a longer path length of wire, so if I attach
the ends of the first and second layer in parallel, the DC resistance of
the outer layer will be higher, so I don't know if this will cause a
lower Q in the inductor. The other option is wind two strands at once
and then make a second layer with these, but that requires insulation
between the first and second layers.

cheers,
Jamie
 
M

MooseFET

Jan 1, 1970
0
Hi,

I wound a test inductor using litz wire and a ferrite core, one layer of
wire on the bobbin, now I realize there is still enough room for adding
another layer of wire.  I would like to keep the same number of turns,
is it ok to wind the next layer on top of the first, in parallel with
the first layer?  The reason I ask is the second layer will have a wider
loop of copper, and thus a longer path length of wire, so if I attach
the ends of the first and second layer in parallel, the DC resistance of
the outer layer will be higher, so I don't know if this will cause a
lower Q in the inductor.  The other option is wind two strands at once
and then make a second layer with these, but that requires insulation
between the first and second layers.

cheers,
Jamie

You are better off winding with two lengths of Litz placed side by
side for the whole extent of the winding. If you do two layer some
lines of force will try to sneak between them and induce a circulating
current. The more leakage inductance, the worse the problem.
 
J

Jamie Morken

Jan 1, 1970
0
MooseFET said:
You are better off winding with two lengths of Litz placed side by
side for the whole extent of the winding. If you do two layer some
lines of force will try to sneak between them and induce a circulating
current. The more leakage inductance, the worse the problem.

Hi,

Side by side winding, that is one of the two wires always on the outside
with a longer wire length than the parallel inner wire?

cheers,
Jamie
 
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