On Wed, 2010-06-02 at 09:17 -0700, Matthew Wilkins wrote: > 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. Unfortunately, I believe that the model will be more like #3. The power source is a periodic hydraulic one. My ultimate task is to deliver peak power from the mechanical system regardless of the available input power (wave action). In addition to modeling the motor, I will need to model the mechanical components. I looked briefly at the SC site, but it requires a plug-in that I don't have. > __________________________________________________________________ > > From: Mike Crowe <mcr...@gcdataconcepts.com> > To: gEDA user mailing list <geda-user@moria.seul.org> > 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 > _______________________________________________ > geda-user mailing list > [1]geda-u...@moria.seul.org > [2]http://www.seul.org/cgi-bin/mailman/listinfo/geda-user > > References > > 1. mailto:geda-user@moria.seul.org > 2. http://www.seul.org/cgi-bin/mailman/listinfo/geda-user > > _______________________________________________ > geda-user mailing list > geda-user@moria.seul.org > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
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