Posted by John Fields on January 14, 2010, 10:51 pm
wrote:
>John Fields wrote:
>>
>>
>>>NO. Not the same effect. If you soldered the ends of the multistrands you
>>>would have 200 turns only. You would have 10 parallel coils sharing current,
>>>unevenly, due to connection differences and differing reluctance between
>>>strands.
>>>
>>>For 2000 turns, you put the form in a hand drill, measure the gearing step
>>>up ratio and count hand crank turns mentally. 2000 / 10 = 200 turns only.
>>
>>
>> ---
>> The snow hid it well.
>> he slipped and fell, the knife killed,
>> but there was no loss.
>>
>> JF
>Nice.
>A perfect center.
>Hike you said, and it made sense,
>most enjoyable.
>Ed
---
:-)
JF
Posted by Jasen Betts on January 14, 2010, 11:13 pm
> 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?
it'd behave basically the same as a single thicker strand
> 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.
no, it would be different, it'd peak sooner,
but not neccessarily higher
muliple joins could get you 2000 turns and similar performance
to 2000 straight turns but inter-turn capacitance would be much worse.
I would get a drill to turn the former and use some sort of counter to
count turns, possibly the mechanical counter from an old VCR.
Posted by Fred Abse on January 16, 2010, 9:24 pm
On Thu, 14 Jan 2010 23:13:22 +0000, Jasen Betts wrote:
>> 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?
>
> it'd behave basically the same as a single thicker strand
Multifilar winding is sometimes employed to mitigate transmission line
effects in induction motor windings designed to be driven by IGBTs with
sub-microsecond rise times.
--
"Electricity is of two kinds, positive and negative. The difference
is, I presume, that one comes a little more expensive, but is more
durable; the other is a cheaper thing, but the moths get into it."
(Stephen Leacock)
Posted by Michael B on January 17, 2010, 12:35 am
Like a capacitive discharge? Ed Gray motor winding?
> Multifilar winding is sometimes employed to mitigate transmission line
> effects in induction motor windings designed to be driven by IGBTs with
> sub-microsecond rise times.
Posted by John Fields on December 23, 2009, 5:00 pm
On Tue, 22 Dec 2009 17:43:42 -0800 (PST), Michael B
>wrote:
>> Your idiotic predilection for top posting assumes that what you have to
>> say is important enough that everyone should read it first and then go
>> thrashing about, scampering through the thread in order to determine
>> what you were talking about.
>Your position, at the bottom, assumes that your responses
>will be something a reader actually seeks by scrolling past
>all your other trolldom utterances.
> I actually scrolled down to see if you had posted something
>relevant to the topic. But, no. I was disappointed, but not
>particularly surprised.
---
While the original topic was coil winding, this part of the thread has
gone off-topic and diverged to the point where what's being discussed is
the efficacy of bottom and in-line posting VS top posting.
Consequently, since my comments address top, in-line, and bottom posting
they are relevant.
---
>Go back to the bottom where you are comfortable, more easily
>ignored.
---
Isn't comfort and lack of confusion in communications what we should all
strive for?
I've relocated your post so that it follows my earlier one in order that
you might see how much more natural the flow is, chronologically, using
bottom posting.
Just think (if you can) how much easier someone coming across this post
for the first time would find it to understand, reading it from the top
down instead of having to jump about trying to stitch together seemingly
unrelated pieces of quiltwork.
JF
XML site map
>>
>>
>>>NO. Not the same effect. If you soldered the ends of the multistrands you
>>>would have 200 turns only. You would have 10 parallel coils sharing current,
>>>unevenly, due to connection differences and differing reluctance between
>>>strands.
>>>
>>>For 2000 turns, you put the form in a hand drill, measure the gearing step
>>>up ratio and count hand crank turns mentally. 2000 / 10 = 200 turns only.
>>
>>
>> ---
>> The snow hid it well.
>> he slipped and fell, the knife killed,
>> but there was no loss.
>>
>> JF
>Nice.
>A perfect center.
>Hike you said, and it made sense,
>most enjoyable.
>Ed
---
:-)
JF