Re: gEDA-user: Non-linear spice models for power sources operating near stall

[Matthew Wilkins <matthew_m_wilkins@xxxxxxxx>]

   I guess it depends how sophisticated you want your model to be.
   1.  A simple motor/generator model is a resistor, inductor and voltage
   source in series.  The voltage source is proportional to speed.  Torque
   is proportional to current through the winding.   You can measure the
   values directly from the motor;  keep the rotor stationary for the
   resistance and inductance measurements.   This is sufficient for a lot
   of motor modelling work.
   2.  If you're truly stalling the generator, you might want to map out
   the inductance measurements at different rotor positions.   Also, you
   might be able to model cogging torque by putting a sinusoidal current
   source in parallel with the winding, with phase controlled by a
   multiple of rotor position.
   3. More complicated models would vary the inductance depending on
   rotation speed, electrical frequency and possibly angular position of
   the rotor...  but hopefully you don't have to go that far.
   All in all...   I think Spice will be a pretty awkward tool to do any
   more than (1.).  I'd look at something like University of South
   Carolina's VTB (Virtual Test Bed).  It's free, but closed source.
     __________________________________________________________________

   From: Mike Crowe <mcrowe@xxxxxxxxxxxxxxxxxx>
   To: gEDA user mailing list <geda-user@xxxxxxxxxxxxxx>
   Sent: Wed, June 2, 2010 7:28:43 AM
   Subject: gEDA-user: Non-linear spice models for power sources operating
   near stall
   Hello
   Somewhat off topic, but....
   I am working on an energy harvesting device which uses a small
   generator
   (<100W).  I am looking for a spice model that I can use as a template
   to
   create a model for the motor dynamics near stall.  Can anyone point me
   to a good starting point?
   Thanks
   Mike
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