From: John Tserkezis 
Reply-To: Fidonet AVtech Echo 

Jasen Betts wrote:

> ISTM that twice as many turns means twice the inductance
> therefore half the current
> 
> but soince the half current is through twice as many turns you get
> exactly the same magnetic field.
> 
> what am I doing wrong?

  You're doing nothing wrong.  You've dredged up theory that I haven't touched 
in many years, and and starting to remember again.

  If I recall, the easiest way around it, is to gap the core (or, increase the 
gap if it already has one).  It reduces the inductance, but that isn't the 
reason, it also increases the amount of current you can pass through the coil 
before the core saturates.

  I have no idea how one would go about doing this on a production run of a 
motor.  With cores, it's easy, you just get the assemblers to add a sliver of 
paper of whatever inbetween the core to get a gap there, with a motor, it's all 
fixed, the only way around it is a redesign- which isn't an option.

-- 
       -o)
       /\\    Message void if penguin violated
      _\_V    Don't mess with the penguin

Linux Registered User # 302622                         http://counter.li.org>
Fido: 3:712/610  BBS/FAX: +61-2-9716-8310  Internet: jt{at}techniciansyndrome.org

--- ifmail v.2.15