A Contribution to the Theory of Rotating Electrical Machines

This contribution introduces a vector interpretation to unify the description of torque development in rotating electrical machines. The motivation behind this attempt is the necessity of applying different physical interpretation and calculation methods, such as Lorentz force, Maxwell stress tensor, co-energy methods etc., for predicting and estimating different torque components, e.g. synchronous torque, oscillating torque, cogging torque, reluctance torque etc., in different rotating electrical machines. The unified vector model describes and estimates the different torque components in rotating electrical machines with an apprehensible concise formulation. Beyond that, the other most frequently used tools and terms in the field of electrical machines, such as Park and Clark transformations, phasor diagram etc., can be derived directly from this model, which has also a simplifying didactic contribution to a conventional course of electrical machines