Discussion Forum

Hi Dear Comsol Members,

I need a little precious time of yours for a little advice please regarding approach of calculation of voltage induction from magnets to a rectangular spiral coil.

So for voltage calculation in Comsol (my coils are spiral with a width of 0.5um and gap between turns as 0.5um as well with total turns 311 no and these coils are within an area of 8mm x 0.625mm, SCHEMATIC attached) I calculated d(B.A)/dt using comsol.
As you know that to the best of my knowledge there is not any option to model any such coil in Comsol for voltage computation. So I used the technique as recommended in paper and adopted the following steps:
1. Compute the magnetic field at all times (in the interval chosen)
2. Then I integrated the magnetic field (=magnetic flux density) on each coil and multiply that by no of coils.
3. Then added flux in all coils.
4. Then finally computed the time derivative of total flux and this is the induced voltage at the set of coils.

One issue is that as there is gap between the coil turns, so you may say that in an area of 8mm x 0.625, 50% of area is occupied by coils and remaining 50% is empty space. Does that effect in above calculation please? If so can I simply divide my results by two and consider the remaining result of voltage? But to the best of my extent, my approach is correct as one have to sacrifice the little details during analysis.

Kindly give your recommendation in the light of your vast experience, I need it on urgent basis please.

Waiting for your kind response.

Regards,
Danish