Reduction in Size and Power Consumption of a Bearingless Motor and its Application to a Next-Generation Clean Device

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The research objective is to reduce the size and power consumption of a bearingless motor and its application to a next-generation clean device. A proposed two-dof actively positioned bearingless motor was applied to a compact centrifugal pump. A water head of 1.5 m and a flow rate of 4 L/min were available. Core loss was reduced by 85 % with stator cores made of soft magnetic composites. A novel one-dof actively positioned bearingless motor, which employs one set of three-phase winding and thus one three-phase inverter, dubbed a single-drive bearingless motor, was proposed, fabricated, and tested, and its feasibility was demonstrated. In addition, utilization of a zero-phase current for an active regulation of an actuator was proposed. The proposed method has a possibility of further downsizing and energy saving of a bearingless motor system.