关键词: 屏蔽套损耗, 屏蔽式主动磁轴承, 微元法, 损耗分离实验

Abstract: Unlike conventional magnetic bearings, the canned active magnetic bearing ( CAMB ) incorporates nonmagnetic stainless steel cans on both the inner surface of the stator and the outer surface of the rotor,enabling operation in harsh environments such as corrosive liquids. The magnetic flux variations caused by rotor rotation and current ripple induce additional eddy current losses in the stator and rotor cans. This paper proposes a computational model for can loss estimation based on the micro element method and harmonic separation. The mechanism of eddy current generation in the cans which induced by both the constant and harmonic components of magnetic flux is analytically derived, and the respective eddy current losses are calculated. The model is further refined by accounting for the end-effect eddy current paths. Additionally, conventional copper losses, iron losses, and wind friction losses are computed. An experimental platform for CAMB loss measurement is established,and a series of loss separation tests are designed to validate the accuracy of the proposed model.