中文摘要：

针对电机轴承高速化载荷高的需求以及磁流体轴承具有的自润滑密封、可靠性高、高速、低摩擦润滑等一系列优点，对磁流体轴承在不同条件下的性能开展了研究。首先从理论上推导了磁流体粘度的相关公式，通过采用Matlab软件在外加磁场的条件下，对磁流体的粘度进行了修正，并给出了磁流体轴承润滑的粘温、粘压特性。其次，采用有限元分析方法设计了外加磁场，并对轴承内部的磁场分布进行了分析。研究结果表明，在外加磁场的作用下，磁流体轴承润滑的粘度发生变化，同时，相较于传统普通轴承，磁流体轴承的承载能力得到提高，能在高温、高速的工况下工作。

英文摘要：

Aiming at the requirement of high speed and heavy duty beatings, and the advantages of the magnetic fluid beating in terms of self-lubricating sealing, high reliability, high-speed, low-friction lubrication, the performance of the magnetic fluid bearing was evaluated. Firstly, the theoretic analysis of viscosity of the magnetic fluid were carried out. An external magnetic field was applied and the viscosity- pressure and viscosity-temperature characteristics were obtained by using Matlab. The magnetic field distribution was designed and obtained using the finite element analysis. The results indicate that under the influence of external magnetic field, the viscosity of the magnetic fluid bearing lubricant changes, meanwhile, compared to the conventional bearing, the bearing capacity of the magnetic fluid bearing is improved, and therefore, it can work in conditions of high temperature and high speed.