Review of off-line synchronous inductance measurement method for permanent magnet synchronous machines

In permanent magnet synchronous machines (PMSMs), the synchronous inductances have important influences on both steady state and dynamic performances, such as designing control strategies, predicting torque and flux-weakening capabilities. However, standard procedures for the inductance measurement have not been established yet. This paper presents a comprehensive analysis and comparative study of the various off-line methods that can be used to measure the inductances based on their accuracy, experimental setup and complexity. These approaches can be classified into three main categories: load test, DC standstill test and AC standstill test. Moreover, with the employment of finite element analysis (FEA), qualitative comparisons are done among these methods.