Wires for Inductor Windings

The only possible problem I see is if you flex your wire enough to induce metal fatigue.

And maybe reduce the density of the winding, which may not be a good thing.

Loudspeaker makers use flat wire to get the highest density. (Whatever the sparky term is.)

I think it is "packing factor" expressed as a decimal when talking about windings. The ratio is volume of copper to total volume. (Or whatever the winding material is).

yeah..but i am using 4 to 5 pieces of copper wire (0.33mm) and twirl (bundle) them together first before winding it to the core. i mean, what difference does it make if i just use a single wire?

i was wondering this since some of my friends said they normally bundle them before winding and some would say it's fine using just a single wire for the windings. does the current flowing plays a role in this?

anyway, thanks for the reply :)

It all depends on the frequency of the signal running through the wires. If I understand your statement, you are wiring five wires in parallel to make a turn around a core. This will reduce the inductor's series resistance. This technique is known as making Litz wire. However, you will take up more space with this approach than making your inductor with a single thicker conductor.