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A question about coil winding - Page 44

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Posted by daestrom on December 5, 2009, 10:12 pm

Michael B wrote:

Sometimes when rewinding an old motor, we would find that more than one
'strand' was used in making the original coil.  For example, they may
have taken two #14 and one #16 AWG wire together and wound the coil with
all three at the same time.  Naturally, we would have to duplicate this
with the new coils we wound for replacing them.

We mounted spools of the appropriate 'magnet wire' (enamel insulated
wire) together and fed all three into the coil block and then wound the
correct number of turns.

This gives you more current capability, without having to use the much
stiffer lower-gauge wire.  Of course with the random wound coils, it
took up more room.  Nevertheless, we did run across it from time to time.

We called such windings 'two in hand' or 'three in hand' as the case may be.

As long as the individual strands are insulated so that you don't end up
with 'shorted turns', I don't see why you can't do that.  Of course
there's a limit to how much wire you can cram into the slot and how many
turns you can get...


Posted by Josepi on December 6, 2009, 12:30 am

Perhaps for the starting winding or a motor/gen set configuration?

I don't believe the OP meant that usage you suggest as he always refers to a
singular word usage "wire".

The OP needs to clarify with his new found information and education.

"Preparing to wind a motor coil or more. Need some info to consider a
shortcut. Putting aside the issue of current handling capacity, does
anyone have awareness of whether a multstrand wire made of smaller
magnet wires can serve instead of a single wire with the same number
of windings?
It would mean handling a less fragile wire set, and keep from having
to set up a coil winding jig."

Posted by daestrom on December 9, 2009, 10:32 pm

Josepi wrote:

Actually no, these were three-phase low-voltage motors (<600V).  The two
or three conductors were normal 'magnet wire' (single strand, insulated
with varnish).  The conductors would be joined together at the end
before connecting to other coils when making up the end connections.  So
'externally' it just looked like an X turn coil with a cross-section
equal to the sum of the individual conductors.

You may be reading more into the OP's exact wording then they meant.
Not everyone is so exact in their interpretation of 'wire'.

He seems to be asking about what I mentioned previously, taking a couple
of individual, single-strand magnet wires and combining them at the time
of winding to create a multiple-conductor cable/wire to wind the coils with.

I don't know why they think a multi-strand wire would be 'less fragile',
that part doesn't make sense.

But as I said before, we did use two or three parallel strands of 'wire'
to make coils of higher current capacity using smaller individual strands.


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