RE: control panel measurments

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Luke" <Bluu-at-cox-dot-net> 

Thanx for the input.
As for the mechanical force being exerted on the magnetic field and
therefore representing a load other than just the inductance, never
thought of that either.  Seems sometimes I ask a question and have
something that should have been obvious thrown back at me.  Hope there
isn't enough of that to bug people too much.


Luke Galyan
Bluu-at-cox-dot-net
http://members.cox-dot-net/bluu

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Tuesday, March 02, 2004 6:53 AM
To: tesla-at-pupman-dot-com
Subject: Re: control panel measurments

Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net>

Luke,

You ask the greatest of questions.  A pure inductive load can not do any
work.  Of course short of super conductors, inductors will have some
resistance that will dissapate some heat (ie I^2R thingy).  For motors,
electrical energy is transformed into mechanical energy and results in
real
work being done (torque * RPM). With this conversion, the electrical
load
the motor presents to the line is not purely inductive and the power
factor
is larger than zero.  If I remember right, the PF changes with the
mechanical load to reflect the real work being done.  PF is greatest at
rated mechanical load and smallest at no mechanical load.

Gerry R

  > Original poster: "Luke" <Bluu-at-cox-dot-net>
  >
  > Thanx for the input.
  > It rings a bell from my electronics school days but I seem to have
lost
  > most of it.
  >
  > Out of curiosity if the load seen by the source were purely inductive
  > and the pf was zero can the inductive load do any work?  Like say it
  > were a motor or .............
  >
  > Seems that if the true power were zero then there would be no power
to
  > be put to work.
  >
  > Thanx
  >
  > Luke Galyan
  > Bluu-at-cox-dot-net
  > http://members.cox-dot-net/bluu
  >