Nodal Forces with permanent magnet
Posted: 23 Apr 2021, 14:36
Hi all,
I'm investigating an electrical machine in 2D with embedded permanent magnets in the rotor.
If I calculate the torque by means of giving "r outer" and r Inner" (Arkkio's equation?) and compare it with the torque calculated by means of "Torque Groups" on the stator, the results are quite similar. However, if I calculate the torque by means of "Torque Groups" on the rotor the results are different (difference around 1%).
In Paraview, I saw nodal forces on several places in the rotor. I didn't understand the nodal forces around the magnets and tried to understand it.
I made a simple example (Magnet3.zip) with an iron circuit (light grey) around a magnet (red). The magnet is magnetized in the x direction and in Paraview (the vtu file is in Magnet3.zip), I saw nodal forces (x component) on the iron sides of the small air gaps between iron and magnet. However, I missed the corresponding force on the magnet side.
Any help in understanding this problem is helpful.
With kind regards,
Martin Hoeijmakers
I'm investigating an electrical machine in 2D with embedded permanent magnets in the rotor.
If I calculate the torque by means of giving "r outer" and r Inner" (Arkkio's equation?) and compare it with the torque calculated by means of "Torque Groups" on the stator, the results are quite similar. However, if I calculate the torque by means of "Torque Groups" on the rotor the results are different (difference around 1%).
In Paraview, I saw nodal forces on several places in the rotor. I didn't understand the nodal forces around the magnets and tried to understand it.
I made a simple example (Magnet3.zip) with an iron circuit (light grey) around a magnet (red). The magnet is magnetized in the x direction and in Paraview (the vtu file is in Magnet3.zip), I saw nodal forces (x component) on the iron sides of the small air gaps between iron and magnet. However, I missed the corresponding force on the magnet side.
Any help in understanding this problem is helpful.
With kind regards,
Martin Hoeijmakers