I wonder if anyone could help me please?

I am looking at the following symptoms on a machine:

Rotating armature which has a magnet on front face to hold down a metal die. Cylinder is getting hot and splitting cutting die equipment held on by magnetic field. Signs of resin can be seen after a few hours of use which I believe is coming out of the cylinder magnet heads, or die material? Not sure at the moment.

The armature spins at 1 revolution per second and the diameter is 203mm's.

Ultrasonic's are located at one point onto the cylinder (2 x 20KHz)

First of all, if the Cylinder being a magnet rotated - this would cause a magnetic field - how can I calculate this field??

Adding the 2 x 20KHz to this in the opposite direction, My thoughts are that EMF will be present between the two which will cause heat, and this heat along with the ultrasonic's will heat the die and magnet causing the resin to change state and become knocked out by the resin.

A simple thought process, if the supply voltage into the signal generator is too high, this could produce a higher output frequency which would then produce the above effects?

Could anyone help me calculate this please??

Thank you. Alastair