A micro power supply for space micro-electromechanical systems using a high-temperature superconductor-magnet bearing

This paper investigates the possibility of using a high temperature superconductor (HTS) for a micro power supply in space micro-electromechanical systems (MEMS). Feasibility studies have been carried out to develop a micro HTS-magnet bearing system which can be used for wear prevention and as a power supply. The rationale lies in the unique capability of the HTS to adapt to low temperatures, radiation, and vacuum environments in space, and to enhance system stability passively without power consumption. This micro power supply consists of three components: an HTS magnet flywheel energy storage system, a motor/generator, and a lithium micro battery. The generator armature planar coil will be deposited on the surface of the stator of the flywheel which encloses the HTS. The rotor of the flywheel has alternating permanent magnet poles for the motor/generator. The HTS flywheel has high angular momentum storage since its drag torque is nearly velocity-independent and extremely small, enabling high-speed rotation. Preliminary investigations show that the micro-sized superconductor magnet bearing system is compatible with current micro-fabrication technology and is ideal for preventing wear and producing power in space applications