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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: Mon, 12 Apr 2004 10:18:25 -0400
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- Thread-topic: [FEMM] enquiry about linear motor!

    Ahmad,
    	After computing the force-displacement-current relationship of
    your linear motor, you will also have the emf constant (volts/m/sec)
    which equals the force constant (nt/amp).  Using the equivalent circuit
    of the motor, you can couple the electric and mechanical differential
    equations, the time solution of which yields a voltage-forced solution
    for the problem.  The current forced solution is simpler, since you
    won't require the equivalent motor circuit.
    	You will need to compute motor inductance for the circuit
    equation, which can also be estimated using FEMM.
    Lee

    -----Original Message-----
    From: Ahmad Eid [mailto:ahmad_m_eid@yahoo.com]
    Sent: Thursday, April 08, 2004 8:50 PM
    To: FEMM mailing list
    Subject: RE: [FEMM] enquiry about linear motor!

    Dear all

    I simulate a permanent magnet linear motor. I can get
    the force against displacement using lua script.

    Then we can get the velocity from the acceleration.
    after that  we can get the dispacement as a function
    of time. After that we move the translator according
    to this calculated displacement and get the force
    again.

    Is this a right way to express the linear motor in magnetodynamic
    analysis?

    Any suggestion is appreciated
    thank you very much

    ahmad

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