RE: [FEMM] enquiry about linear motor!

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

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@xxxxxxxxx] 
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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