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Simulating a single layered coil wound directly on top of itself.

Posted Nov 11, 2014, 8:25 a.m. EST 5 Replies

Robert Byrne
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Hello,

We are designing an electromagnet that uses multi-turn coils. The wire making up the coils is to be tape-like and wound directly on top of itself instead of being wound like a solenoid.
Is it possible to get COMSOL to simulate this type of coil design?
The reason I ask is because when we simulate the design for varying number of turns, we observe a linear relationship between the number of turns and the magnetic field produced.
According to the equation; Magnetic Field (B) = [(mu_0)(Current,I)(Number of turns, N)] / (2*Radius), this shouldn't be the case as an increased number of turns should also increase R.

Thanks for the help in advance,

Happy comsoling,

Rob and Callum
5 Replies Last Post Nov 11, 2014, 1:50 p.m. EST
Edgar J. Kaiser Certified Consultant
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Posted: 1 decade ago Nov 11, 2014, 8:47 a.m. EST
Hi,

which way are you exciting the coil?

Cheers
Edgar

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Hi, which way are you exciting the coil? Cheers Edgar -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com
Robert Byrne
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Posted: 1 decade ago Nov 11, 2014, 8:57 a.m. EST
Hi Edgar,

We've defined a single cross sectional surface within the coil through which the current flows.

Thanks,

Rob
Hi Edgar, We've defined a single cross sectional surface within the coil through which the current flows. Thanks, Rob
Edgar J. Kaiser Certified Consultant
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Posted: 1 decade ago Nov 11, 2014, 9:48 a.m. EST
So I assume you are using current excitation. This enforces constant current. You can change it to voltage excitation and you will probably see the expected behavior.

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
So I assume you are using current excitation. This enforces constant current. You can change it to voltage excitation and you will probably see the expected behavior. -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com
Robert Byrne
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Posted: 1 decade ago Nov 11, 2014, 10:42 a.m. EST
Hi,

Thanks we've tried to use a voltage input and have observed different behaviour.
We are confused by the fact that a voltage input has led to an increase in magnetic field, as this seems counterintuitive. A quick calculation using the formula for length of wire in a coil has given us a resistance greater than 1 Ohm, suggesting current and field should decrease. Is there a way to find out the process Comsol uses to calculate resistance in the coil?

Thanks again,

Rob and Callum
Hi, Thanks we've tried to use a voltage input and have observed different behaviour. We are confused by the fact that a voltage input has led to an increase in magnetic field, as this seems counterintuitive. A quick calculation using the formula for length of wire in a coil has given us a resistance greater than 1 Ohm, suggesting current and field should decrease. Is there a way to find out the process Comsol uses to calculate resistance in the coil? Thanks again, Rob and Callum
Edgar J. Kaiser Certified Consultant
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Posted: 1 decade ago Nov 11, 2014, 1:50 p.m. EST
You may have to check the wire setting. For further reference I would recommend the documentation and the COMSOL support.

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
You may have to check the wire setting. For further reference I would recommend the documentation and the COMSOL support. -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com

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