Modeling, simulation and hardware implementation of a Lundell Machine controller circuit with three-phase inverter bridge

This paper focuses on the modeling, simulation, construction and experimental testing of a Lundell Machine controller circuit with three phase inverter bridge. The controller circuit was designed and built with the capability of employing both sensorless and sensored control methods, with an added feature of enabling control of the power delivered to an additional winding, which is rare in this type of circuitry and essential for wound-rotor motors such as the Lundell Machine. Alongside, a new sensorless Back Electromotive Force (BEMF) method was implemented, employing average phase to phase voltage comparison on 3-phase EMs, with the intent of reducing the cost of the controller and improving robustness. The experimental results, together with the simulation values, depict the controller performance.