Magnetic bearings can be used in reaction wheel systems to avoid several drawbacks of ball bearings, such as limited lifetime due to mechanical friction and lubricant monitoring/sealing requirements. Therefore, this letter discusses an electrical machine topology with integrated reaction wheel and magnetic bearings. The slotless/ironless structure, together with a new electromagnetic arrangement resulting in a shorter rotor than in earlier works, enables efficient operation at very high speeds, which in turn enables the miniaturization of the system. Measurements taken on a demonstrator prototype at 300 000 r/min show a significant increase of the feasible operational speed range compared to the state-of-the-art reaction wheels for small satellites, which typically run below 10 000 r/min.

中文翻译：

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300 000转/分钟磁悬浮反作用轮演示器


磁力轴承可用于反作用轮系统，以避免球轴承的几个缺点，例如由于机械摩擦和润滑剂监控/密封要求而导致的有限使用寿命。因此，这封信讨论了具有集成反作用轮和磁力轴承的电机拓扑。无槽/无铁结构，加上新的电磁布置，使转子比早期作品更短，能够在非常高的速度下高效运行，从而实现系统的小型化。在演示原型机上以 300 000 转/分钟进行的测量表明，与小型卫星的最先进的反应轮（通常运行速度低于 10 000 转/分钟）相比，可行的运行速度范围显着增加。