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# RE: [FEMM] enquiry about linear motor!

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- Subject: RE: [FEMM] enquiry about linear motor!
- From: "Dr. Lee Marriott" <Marriott@tpresearch.com>
- Date: Wed, 7 Apr 2004 06:58:57 -0400
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- Thread-topic: [FEMM] enquiry about linear motor!

    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@yahoo.com]
    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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