中文摘要：

提出一种用于小型水泵的无轴承无刷直流电机，介绍了其结构、磁悬浮产生的原理以及磁悬浮控制的策略，并进行了无轴承无刷直流电机的模型仿真及磁悬浮性能测试试验。有限元法分析计算的结果证明所设计的这种用于小型水泵的无轴承无刷直流电机的模型精确有效。使用所设计的机械样机进行了悬浮性能测试试验，通过试验证明以2200rad／s最大转子速度和8．2L／s最大水流量驱动小型水泵时，转子能够成功地悬浮而没有机械支撑。从结果中可以得到所设计的磁悬浮控制策略作为无轴承无刷直流电机的控制方法是有效的，并且所设计的无轴承无刷直流电机特别适用于驱动小型水泵系统。

英文摘要：

The experiment results of the magnetic suspension in a bearingless brushless DC motor to apply in small liquid pumps was presented. The bearingless motor structure, the principle of the suspension force generation and the magnetic suspension control strategy in the bearingless brushless DC motor had been proposed by the author. A prototype bearingless brushless DC motor had been designed based on the computed results by Finite Element Method（FEM） to apply a small liquid pump. It was confirmed by the experiments using the prototype machine that the rotor was successfully suspended without mechanical contact when it drived a liquid pump at the maximum rotational speed of 2 200 rad/s and the maximum fluid flow of 8.2 L/s. This result showed that the control method was valid and the proposed bearingless brushless DC motor was enough suitable as the drive for the small liquid pump.