Abstract
This paper proposes an inductance identification method of IPMSM using adaptive observer with high frequency current injection. Firstly, a flux model on the coordinate fixed to the stator is derived to construct the adaptive observer for inductance identification. This flux model involves just R and Lq, so that this model is superior to other model expression in terms of inductance identification. Next, the adaptive observer is constituted based on this model, and identifiability of Lq is analyzed in detail. As a result, this paper will clarify that Lq cannot be identified with only fundamental components of driving signals. This implies high frequency signal injection necessitates for identification of Lq. In this paper, high frequency current is injected into q axis for Lq identification by the proposed adaptive observer. Finally, the experimental results show feasibility of the proposed method.
