Compensation Method of Radial Unbalance Force at Failure of a Motor Section in a d-q Axis Current Control Bearingless Motor

摘要

This paper focuses on a stabilized magnetic suspension control method when a motor section is unfortunately failed during its operation in the d-q axis current control bearingless motor (d-q BELM). The d-q BELM consists of three sections, in which is divided by every 120° part in the stator circumferential direction. In each section, the 3-phase winding current is independently controlled by an inverter. Hence, it is possible that the rotor shaft will be supported by the other two sections without mechanical contact even though a section is failed. The stabilized control method at no load has been proposed by the authors, and the validation of the proposed method has been verified by the simulation and experimental test results. The aim of this paper is to support the rotor shaft even under loaded condition when a section will be failed. In order to solve this problem, the suspension force compensator is newly proposed and the effectiveness is found by FEA (Finite Element Analysis) using a simulation software.