Radial forces in Flux for SRM (Fr for vibration)

Mohammad Ehsan Abdollhai

Hi
I am using Altair flux for measuring the radial forces (for vibration analysis)

I have to options: 

1. Mechanical Analysis Context ()
2. Calculate it from Br and Bh (maxwell tensor)

 

The problem is that the results are not the same and I don't know how to verify them. 

pic1: the yellow high lighted area is the path for Fr calculation.

 

pic2: Result of Fr from "Mechanical Analysis Context":

pic3: result from maxwell tensor equation:

Code for Maxwell tensor (based on Br and Bt):

%%maxwell equation:

dFr = (Br.*Br - Bt.*Bt)/(2*mu0);

Fr = dFr .* area;     %area is the 3d mesh area for each sensor position

 

 

Thank you in advance

Farid zidat_20516

Hello; 

To get the radial and tangential component of the electromagnetic forces ont the tooth please use the ne new Import/ export context, and then compute the magnetic forces on an imported mechanical mesh.

You can compute the global magnetic force by tooth.

 

Please follow the steps indicated on the help:

as well as the available tutorials:

 

 

I hope this will help you

 

Best regards 

Mohammad Ehsan Abdollhai

Farid zidat_20516 said:

Hello; 

To get the radial and tangential component of the electromagnetic forces ont the tooth please use the ne new Import/ export context, and then compute the magnetic forces on an imported mechanical mesh.

You can compute the global magnetic force by tooth.

 

Please follow the steps indicated on the help:

as well as the available tutorials:

 

 

I hope this will help you

 

Best regards 

Hi
Thanks for your kind answer. 
I don't have problem with exporting the forces to hyper mesh. I want to verify them with the theory to make sure that the position of my path is correct. Is there difference between the forces measured on the imported support and the path that I define in the flux? 

I tried different paths but I can't verify them with Maxwell tensor. I will attache the paths that I tried:


The formula that I use for maxwell radail forces:

To make sure that the magnetic fields are correct, I used the Ft to calculate Torque and it was the same as the electromechanical torque that the FLUX shows.

Thanks in advance
Ehsan,

Farid zidat_20516

Hello Mohammed;

 

You are welcome!

 

Actually the path should be located in the air gap. So you have first to compute the magnetic pressure thanks to Maxwell Tensor, and then compute the magnetic force thanks the area of the tooth. But, in our computation, we include also the magnetic pressure under the slot openning.

 

I hope this is more clear for you now.

 

Regards