Design of Controller for Conventional 8/6 Switched Reluctance Machine with Small Signal Modelling and Anti-Windup Technique

The electrical rotating machines consist of non-linear magnetic characteristics due to their inductive nature and the existence of different air gaps. The control and stability analysis with this type of magnetic characteristics is a complex task and proper tuning is required. Especially the special machines like switched reluctance machines (SRM) the inductance variation is depending on the reluctance over the traditional machines. Because of this, the controller design with traditional Proportional + Integral (PI) controllers may not give superior results in terms of transient and steady-state operational characteristics. This paper discusses the tuning of PI controllers by deriving the optimized plant transfer function of SRM and integrating non-linear techniques like an anti-windup scheme for an improved and stable response. The mathematical modeling of 8/6 pole SRM is presented. The implementation of 8/6 pole SRM has been carried out using the look tables of torque vs phase currents, rotor angle, and phase inductance vs phase currents, and rotor angle in MATLAB. The look-table data is derived with Finite Element Analysis (FEA) tools like FEMM and JMAG. The detailed steady state and transient response of 8/6 pole SRM with a modified PI controller with anti-windun logic are nresented.