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针对无轴承无刷直流电机的磁悬浮性能进行研究,介绍了电机结构、其定子绕组分布、悬浮力产生的原理以及这种无轴承无刷直流电机的磁悬浮的控制策略.通过采用有限元方法分析电机转矩和悬浮力,并基于有限元分析的结果设计出一种新型无轴承无刷直流电机.机械原型的建立和转子漂浮的测试证明了所提出的磁悬浮控制方法和磁悬浮性能的实验评估是正确的.从实验结果中可以得到转子的转轴在没有机械支撑的情况下能够稳定悬浮.提出的这种控制方法被证明很适用于无轴承无刷直流电机中转子的稳定悬浮.“,”This paper presents the magnetic suspension performance of the bearingless brushless DC motor. The new motor structure, the winding distribution in the stator, the principle of suspension force generation and the magnetic suspension control strategy for the bearingless brushless DC motor have been proposed. The rotational torque and suspension force have been analyzed by finite element method (FEM) using the machine model. A prototype bearingless brushless DC motor is designed on the basis of the analysis results by FEM. In this paper, the prototype machine is built and the rotor levitation tests are carried out to confirm the validity of the proposed magnetic suspension control method and experimentally measure the magnetic suspension performance. From the experimental results, it is confirmed that the rotor shaft is stably suspended without the mechanical contacts. The proposed control method is found suitable to realize the stable levitation of the rotor in the bearingless brushless DC motor.