Estimation of the electrical parameters of a five-phase induction machine using standstill techniques. Part I: Theoretical discussions

The interest in multiphase drives has recently gained attention of the research community due to their applications when high overall system reliability and/or the reduction in the total power per phase are required. The control strategies for these applications require a good knowledge of the machine parameters to avoid deterioration in the drive performance. These electrical machines are very uncommon in the industry, and most researchers must rewind conventional three-phase machines to obtain the multiphase counterparts. However, the rewinding process does not necessarily preserve the original parameters of the machine. This paper presents and validates a procedure to estimate the parameters of a five-phase induction machine. Part I discusses the method which is based on standstill time-domain test and the application of recursive least-square algorithm to the discrete-time model and it can be easily extended to other multiphase machines. Simulation and experimental results are shown in Part II.