I am building an application were a Disc magnet is placed closed to a copper plate. This magnet rotates about its axis. This magnet will not move with respect to the plate, only rotate.
I want to minimize eddy current losses due to this rotating magnet but maximize eddy current losses by translation in any direction.
In principle if the magnetic flux is perfectly homogeneous on the surface, meaning that along a given circle of any radius on the surface of the cylinder the flux is the same along that circle. If also the magnetic flux axis is aligned with the axis of rotation, this rotation should not produce eddy currents.
How accurate is my assumption?
Are magnets in real life this homogeneous?
Is the magnetic axis the same as the geometric axis of the magnet?
Is there a way to minimize rotational eddy currents without minimizing transnational eddy currents?
I am planning to enclose the magnet as much as possible with non/ferrous materials to maximize this transnational damping.
My final goal is to have a magnet/plate setup in which the magnet can rotate as free as possible along its magnetic axis, but be damped as much as possible by any translation movement.
Very similar to a magnetic bearing.