Abstract
Since the ultra-high speed magnetic levitation rotor (MLR) system supported by permanent magnet biased magnetic bearing (PMBMB) has the characteristics of high power density and ultra-high speed. It is necessary to focus on the dynamic effects of high temperature on its current stiffness and displacement stiffness. Therefore, this paper analyzes the dynamic stiffness of the PMBMB, and proposes a dynamic stiffness measurement method based on the conversion of control modes. Firstly, the expressions of the dynamic stiffness varying with temperature are derived based on the equivalent magnetic circuit. Then, the zero current controller is designed, and a dynamic stiffness measurement method is proposed based on the conversion of control modes. In addition, the measurement procedures are given in detail. Finally, the experimental results demonstrate the rationality of the dynamic stiffness model and the effectiveness of the measurement method, which can significantly improve the dynamic performance of the ultra-high speed MLR system.
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