Position Linearization in Flux Models of Switched Reluctance Machines for PI Control

The inherent high nonlinearity of Switched Reluctance Machines (SRMs) poses significant challenges to modeling. Conventionally, large-data-size lookup tables (LUTs) are used, which consume extensive storage space in digital signal processors (DSPs) and complicate the application of well-established PI control techniques. This paper presents a linear flux SRM model, leveraging the space mapping method to map the SRM's nonlinear flux profile into a linear space in relation to both current and position. The proposed linear model offers two key advantages. First, it reduces data storage needs due to smaller LUTs. Second, it enhances the feasibility of applying PI control. Simulation results of an 8/6 SRM are presented to illustrate the proposed approach.