Axial Active Magnetic Bearing with Laminated Stators and Slit Rotor Disc Used in On-board Machinery

The integration of rotating machinery with active magnetic bearings (AMBs) has been increasing, driven by the trend towards enhancing efficiency and increasing energy density through high-speed technologies. In addition, high-speed machines are being applied in increasingly demanding environments, such as on-board ships, where the entire rotating system is subject to various movements and vibrations caused by the moving platform. Such environments impose much stricter requirements on the dynamic performance of the AMB system compared to stationary systems. During dynamic operation, axial AMBs with solid iron stators and solid disc face excessive eddy current losses and temperature rise, which limits their bandwidth and dynamic response during critical events like compressor surges and thrust disturbances. The solid cores experience high eddy currents during transients, restricting the build-up or removal of flux, thereby reducing the achievable force. To overcome these limitations, this paper proposes novel configurations featuring laminated or layered stator cores and slit rotor disc, designed to reduce eddy current losses, improve thermal management, and enhance bandwidth.