RE: [FEMM] enquiry about linear motor!

["Dr. Lee Marriott" <Marriott@xxxxxxxxxxxxxx>]

Ahmad,
	If you are modeling a permanent magnet linear motor, you can
apply currents at different rotor positions (using a lua script) to
develop an equation for force as a function of displacement and current.
The forces can then be coupled with Newton's 2nd Law to solve the
dynamic linear motor problem.  Numerical integration techniques, such as
Runge-Kutta, can be used for the time solution.
	The computed motor forces from FEMM will, of course, be static
and would be somewhat different if calculated using a magnetodynamic
solver.  If really serious about magnetodynamic force calculations,
check out Magsoft or Ansoft products for moving mesh solutions for
linear and rotary motion.
Lee

-----Original Message-----
From: Ahmad Eid [mailto:ahmad_m_eid@xxxxxxxxx] 
Sent: Tuesday, April 06, 2004 10:41 PM
To: FEMM mailing list
Subject: [FEMM] enquiry about linear motor!


Dear all;

I'm trying to simulate a linear motor using FEMM. I
don't know how to express the linear motion for it.
How to determine the linear motor speed or its
distance at any time.

When I apply currents to the stator coils, there will
be a force on the motor. I need to draw this force
against distance or time. Is it right that I move it
step by step and for each step I pick the force value?

If there is a similar messages please tell me.

Any suggestion will be apprciated

ahmad

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