Learning Forum

[mahmoud.yehia]

Hi, I try to calculate EMF at two coil terminals. the coil is drawn as shown, it has three sides, one is outside a rotating ring,one parallel to rotating ring surface and the last one is passing through rotating ring hole.

coil material is copper, Magnet material is N52 

I drew a boundary that touches the coil terminals ( insulation boundary)

I drew a band around rotating magnet disc to defind rotating object ( with inner cylinder subtracted fron outer cylinder), the band took the shape of rotating magnet disc with slightly higher dimensions.

the  problem is that when I try to run simulation, I find this warning message.

Source setup is incorrect. Please make sure the sum of currents in each full winding must be zero in the both stationary moving region, respectively. The full winding is the complete physical winding without being reduced by master/slave and symmetry boundary. 

when I simulate the conductor with all sides outside rotating ring, the simulation runs properly and I got results. but I need to simulate the conductor passing through ring magnet hole as shown. 

Kindly help me with a solution for this problem 

 

 

 

[HDLI]

Hello Mahmoud.yehia,

       The insulation boundary is not needed. Could you remove it?

       How do you define the current? Does input current equal to output current?  Could you show them? Thanks.

Howard

[mahmoud.yehia]

Hi howard 

thanks for your kind reply 

If the insulation boundary is not needed ? so how should I connect two coil terminals  ? 

I assigned two coil terminals with N=1 as shown in figures

and added two coils to a winding 

actually the program doesnot run to calculate currents, only run when the coil is outside the moving band 

back to maxwell help I found this, that hollow cylinders can not be used for band object ! and substraction can not be perfermoed within the band object ! Although that it runs normally when the coil is out side the ring 

Again, the coil is stationary and the band is rotating around Z-axis 

So what if I have stationary coil passing through rotating magnet disc and I want to calculate the EMF at its termianls ? what should I do in this case ?

please help

'

[mahmoud.yehia]

Hi Howard

I created the moving band by subracting two cylinders from each other 

No interference between the coil and moving band 

 

Regards 

[HDLI]

Hello Mahmoud.yehia,

      Maxwell could find the terminals in one conduction path, and connect them through the default boundary.

      Could you rotoate the coil with Band and inner Band? The inner Band would cover the coil and is smaller than Band, to make moving objects as one rigid assembly. Thanks.

Howard

 

[mahmoud.yehia]

Hi howard 

thanks for your reply

Sorry I do not understand what to do

coil is stationary and do not rotating

and cylinder is rotating 

how can I create inner band, coil object will intersect with it ? 

 

regards 

Mahmoud yehia 

[mahmoud.yehia]

Thanks alot howard .. I got it simulation works now .. thanks for your help 

Regards 

Mahmoud yehia