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Designing A Hybrid Variable Frequency Drive (VFD) with Active Magnetic Bearing (AMB) for Space Applications

This paper describes hardware design considerations and performance results of a new state of the art fully integrated hybrid (dual) controller developed for driving a fractional horsepower compressor motor on magnetic bearings for space applications. To improve performance and reliability of compressor motor, magnetic levitation (magnetic bearings) has been used in lieu of more conventional bearings (e.g., ball bearings or air bearings). This improves resistance to contaminants and enable extensibility with regards to blower speed, pressure rise and mass flow rate. The hybrid integrated controller consists of a high-performance Variable Frequency Drive (VFD) and Magnetic Bearing Controller (MBC).