Position and velocity sensorless control of SynRMs using on-line parameter identification

This paper presents a novel on-line parameter identification system for position sensorless control of synchronous reluctance motors (SynRMs). The proposed identification system can identify motor parameters in position sensorless control. Therefore, there is no necessity of complicated measurements of motor parameters in advance. Under position sensorless control, since the mathematical model includes the position and velocity whose actual value is unknown, the estimated position and velocity are substituted for them. As a result, there is a possibility that identified parameters can be affected by the position and velocity estimation error. However, since the proposed system cancels position and velocity terms, identified parameters are not affected by them. The position sensorless control using identified motor parameters is realized, and the effectiveness of proposed system is verified by experimental results.