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A question about coil winding - Page 30

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Posted by Michael B on January 9, 2010, 4:45 am
 



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 multistrand wire made of smaller
magnet wires can serve instead of a single wire with the same number
of windings?




Posted by Josepi on January 13, 2010, 5:14 pm
 


Well done!

Do you have a lot of this multi-strand wire to use for a cheap price?

I think it would make the winding too complicated. Instead of many turns you
will have days of soldering connections to get all the strands in series.
That's a huge lump you may not have room for.



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 multistrand wire made of smaller
magnet wires can serve instead of a single wire with the same number
of windings?




< trolling snipped>

< trolling snipped>

< trolling snipped>

< insulting snipped>
---
<temper tantrum snipped>



Posted by John Fields on January 13, 2010, 6:40 pm
 



LOL, I see that lump on your shoulders relates you directly to
Camelus dromedarius.

JF

Posted by Michael B on January 14, 2010, 1:42 am
 

No.
The field strength is related to the number of coils.
So if I start out and go around the coil form 2,000
times with one wire, could I get the same effect by
using a multistrand, with each strand insulated
from the adjacent one? If I were to use a 10 strand
and only go around the coil form 200 times, would
it have the same effect?
Litz wire would not have much current capacity, but
would it have the same instantaneous magnetic field
from a capacitive discharge?
It's not a question of multiple solder joints along the way,
it would be a beginning, and an end, with wires soldered
together at those points only.



Posted by John Fields on January 14, 2010, 12:31 pm
 

On Wed, 13 Jan 2010 17:42:23 -0800 (PST), Michael B


Well, finally, something that makes sense! :-)

Yes.
---


Litz wire is simply insulated wire stranded in a peculiar way in order
to reduce skin effect, and can have any current capacity required for
the application at hand.

http://en.wikipedia.org/wiki/Litz_wire


For the initial spike:

Version 4
SHEET 1 880 680
WIRE 64 0 0 0
WIRE 224 0 128 0
WIRE 224 32 224 0
WIRE 0 128 0 0
WIRE 224 160 224 112
WIRE 0 288 0 208
WIRE 224 288 224 240
WIRE 224 288 0 288
WIRE 0 368 0 288
FLAG 0 368 0
SYMBOL ind 208 144 R0
SYMATTR InstName L1
SYMATTR Value 1e-3
SYMBOL res 208 16 R0
SYMATTR InstName R1
SYMATTR Value 1000
SYMBOL cap 128 -16 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C1
SYMATTR Value 1e-9
SYMBOL voltage 0 112 R0
WINDOW 3 24 104 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value PULSE(0 10 0 1e-9)
TEXT -34 392 Left 0 !.tran 1e-3
---


If you use stranded wire to make a coil with all of the strands soldered
together at the ends but insulated from each other at every other point,
then the resistance of each strand will be the end-to-end resistance of
the wire multiplied by the number of strands in the wire, and the
current in each strand will be:

           1
     Is = ----
           It

where Is is the current in any strand and It is the total current in the
wire.
 
Since the strands are in parallel, the total resistance of the wire will
be:

             1
     Rt = ------
           Rs n

where Rt is the total resistance of the wire,
      Rs is the resistance of a single strand, and
      n is the number of strands in the wire.


Graphically, (View in Courier) for a raw 1000' length of seven strand
enameled #10 AWG wire we have:  

   |<----------1000 feet------------>|

   |<------------7 ohms------------->|
    ---------------------------------

   |<------------7 ohms------------->|
    ---------------------------------

   |<------------7 ohms------------->|
    ---------------------------------

   |<------------7 ohms------------->|
    ---------------------------------

   |<------------7 ohms------------->|
    ---------------------------------

   |<------------7 ohms------------->|
    ---------------------------------

   |<------------7 ohms------------->|
    ---------------------------------


while with the ends soldered together,:

    |<-----------1000 feet---------->|

    |<-------------1 ohm------------>|
    |                                |
    +--------------------------------+
    |                                |
    +--------------------------------+
    |                                |
    +--------------------------------+
    |                                |
    +--------------------------------+
    |                                |
    +--------------------------------+
    |                                |
    +--------------------------------+
    |                                |      
    +--------------------------------+

    
Now, since I've answered your question courteously, would you extend me
the courtesy of bottom posting a reply, please?

JF

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