Calculation and Analysis of Can Losses of Canned Active Magnetic Bearing

The canned active magnetic bearing (CAMB) achieves stable operation in harsh environments such as corrosive fluid media by installing non-magnetic stainless steel cans on the inner wall of the stator and the outer surface of the rotor. However, the time-varying magnetic fields caused by rotor dynamic motion and current harmonic excitation will induce significant eddy current losses within the cans. This study proposes a loss modeling method that integrates micro-element analysis and harmonic decoupling: Firstly, it deconstructs the eddy current generation mechanisms of the fundamental and harmonic components of the air-gap flux and independently quantifies their loss contributions; Then, the calculation model was corrected based on the three-dimensional distribution characteristics of the end eddy current. Finally, the 3-D finite element model (FEM) of CAMB and the prototype experimental platform were established. The loss separation experiment was designed to verify that the calculation error of the model was less than 5%.