Abstract
One-axis actively positioned bearingless motors have been studied for industry applications such as pumps and cooling fans. In particular, single-drive bearingless motors have a great advantage of simple regulation system. Only one three-phase inverter is required for generating torque and magnetic suspension force by q- and d-axis currents, respectively. The voltage equation is unique because characteristics of both rotating and linear machines are magnetically integrated. The torque constant is derived from the back EMF, then, the current-force factor can be identified. In this paper, a novel parameter identification method of a current-force factor is proposed without direct measurements of the active axial force and the d-axis current.
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