EEMFs Excited by Signal Injection for Position Sensorless Control of PMSMs and Their Performance Comparison by Using Imaginary Electromotive Force

In this paper, Extended Electro-motive Force exited by signal injection, which can be utilized at standstill/Low speed, are discussed. Recently, depending on mathematical expressions for position sensorless control, there are various models of Extended Electromotive Force(EEMF), etc.. By using expression of Imaginary Electromotive Force(IEMF), differences among some models of position sensorless control can easily analyze. In this paper, the IEMF is newly defined including EEMF excited by signal injection, which is evaluated its characteristics. Specifically, we evaluate two types of EEMF excited by signal injection against to the robustness of motor parameters, and finally experiment results are indicated.