生物反应器用外转子无轴承电机的设计与分析

Design and Analysis of Bearingless Machine with Exterior Rotor Topology for Bioreactor Applications

提出了一种新型的外转子无轴承永磁同步电机的设计方案,具有低速、低耗的特点,安装在生物反应器内,取代了传统搅拌轴,为动物细胞悬浮培养创造了一个更易于保护细胞完整、密封性强的温和无菌环境。介绍了电机工作原理,并对该电机径向悬浮力的数学模型进行了推导。利用Maxwell软件分析了电机的气隙磁密以及谐波,重点分析损耗;并利用损耗分析结果,在Motor-CAD软件中建模,得出电机额定状态下的温度,验证了所设计电机的合理性。

A novehopology of bearingless permanent magnet machine was proposed. It was characterized by low speed and low loss. The machine was installed in bioreactor applications to replace conventional strring shaft, and was benefit to create a mild and sterile environment for the animal cell cultivation and easy to protect the integrity of animal cells. In addi- tion, the operation principles of bearingless machine was also introduced and the mathematical model of radial levitation was derived step by step in detial. Air-gap flux density and its harmonic spectrum, stator and rotor loss and so on, were ana- lyzed by Maxwell software. By using the results of loss analysis, the temperature distribution of this machine at rated condi- tion was simulated by Motor-CAD software. The simulated results show that the proposed machine complies with design requirement.