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# Re: [femm] voltage gradient

- To: femm@yahoogroups.com
- Subject: Re: [femm] voltage gradient
- From: David Meeker <dmeeker@ieee.org>
- Date: Wed, 17 Apr 2002 23:44:12 -0400
- References: <20020415101928.94862.qmail@web11004.mail.yahoo.com>
- User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:0.9.8) Gecko/20020204

smaïl mezani wrote:

> `Hello folks,
> I am trying to compute the starting torque of an
> induction motor.
> When I use the "Total Current" option of "Circuit
> properties" I obtain good results.
> But when I impose a three phase Voltage Gradient, femm
> does not do any calculation? (I attach my femm file).
> I have an other question :
> When calculating the torque, DC torque and 100 Hz
> torque (in complex form) are displayed. So what is the
> meaning of the 100 Hz complex torque?
> Thank you for any comment.`

It looks like the conductivity for your coil regions is assigned to be zero--if you try to apply a voltage gradient, there will be no current.
Anyhow, I suspect that this isn't really what you are after--if you are modeling wound coils, you have to stick with defining the current and specifying the conductivity to be zero--otherwise, the region where the coils are in acts like a solid bar.
Dave.
--
David Meeker

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