Influence of Friction on High Speed Permanent Magnet Bearing Rings

To build high speed magnetic bearings using sintered NdFeB magnets, it is necessary to assemble bandages with suitable interference by press-fitting. Here we investigate the joining process between titanium grade 5 bandages and sintered NdFeB magnets using finite element analysis (FEA) and experimental measurements with different friction. The coefficient of friction, µ is determined by measured and simulated force-displacement curves. Simulations show that the coefficient of friction between the joining parts strongly influences residual stresses in the magnet rings and subsequently the permissible speed of the magnetic bearings.