Magnetic Force Computation on a Face Region using a Sensor

Ciro Alosa_21513

Hi everyone,

 

I have a doubt regarding the Magnetic Force Computation on a face region using a Sensor in Flux2D transient magnetic simulation.

The output of the simulation is a Force given by components X,Y,Z and module and phase for each time step. 

The doubt is: since no force coordinates are given, but only the magnitude of its components, where is the force considered to be applied on the face region? Is that on the centre of gravity of the face region?

 

Thank you for your support.

 

Kind regards,

SimonGuicheteau

Hello,

a force computation on a region directly can be a bit misleading as you have seen.

First the region should be surrounded with air regions otherwise you might have some contributions to touching regions. For example region 1 and 2 are touching each other and magnetic. If you compute the force on region 1 only, you will get the force from 1 to 2 which should be compensated but the force between 2 and 1. 

Then, the force on a magnetic region is the integral of dFmagS on all its lines. This quantity is always normal to the surfaces/lines of the region. So this should be the force applied on the geometric barycenter of the region I think. If you are looking for a moment or torque, you might need something more accurate to make sure you;re computing the right thing.

Best regards

SimonGuicheteau

Hello,

a force computation on a region directly can be a bit misleading as you have seen.

First the region should be surrounded with air regions otherwise you might have some contributions to touching regions. For example region 1 and 2 are touching each other and magnetic. If you compute the force on region 1 only, you will get the force from 1 to 2 which should be compensated but the force between 2 and 1. 

Then, the force on a magnetic region is the integral of dFmagS on all its lines. This quantity is always normal to the surfaces/lines of the region. So this should be the force applied on the geometric barycenter of the region I think. If you are looking for a moment or torque, you might need something more accurate to make sure you;re computing the right thing.

Best regards

Ciro Alosa_21513

Simon Guicheteau_22251 said:

Hello,

a force computation on a region directly can be a bit misleading as you have seen.

First the region should be surrounded with air regions otherwise you might have some contributions to touching regions. For example region 1 and 2 are touching each other and magnetic. If you compute the force on region 1 only, you will get the force from 1 to 2 which should be compensated but the force between 2 and 1. 

Then, the force on a magnetic region is the integral of dFmagS on all its lines. This quantity is always normal to the surfaces/lines of the region. So this should be the force applied on the geometric barycenter of the region I think. If you are looking for a moment or torque, you might need something more accurate to make sure you;re computing the right thing.

Best regards

Thank you.

 

I surrounded the face region by two air face regions and two other air line regions in order to obtain the correct magnetic force.

 

So if I understand correctly, If there is a torque acting on the face region and I calculate the magnetic force, the force I obtain does not take into account the torque ?

 

Best regards

SimonGuicheteau

Ciro Alosa_21513 said:

Thank you.

 

I surrounded the face region by two air face regions and two other air line regions in order to obtain the correct magnetic force.

 

So if I understand correctly, If there is a torque acting on the face region and I calculate the magnetic force, the force I obtain does not take into account the torque ?

 

Best regards

The torque is contained within the force, it only depends around which axis you are looking at. You can create an "axis torque computation" which allows you to put arbitrarily an axis around which the torque should be computed. This should also consider the force on the region but with a given radius from the origin

Ciro Alosa_21513

Simon Guicheteau_22251 said:

The torque is contained within the force, it only depends around which axis you are looking at. You can create an "axis torque computation" which allows you to put arbitrarily an axis around which the torque should be computed. This should also consider the force on the region but with a given radius from the origin

Thank you very much.