Eccentric air-gap element for transient finite-element machine simulation
Purpose - To propose an air-gap element for electrical machine simulation which accounts for static and dynamic rotor eccentricity. Design/methodology/approach - The air-gap element technique is extended to account for a non-centered rotor. The consistency, stability and convergence of the discretisation error are studied. A specialized efficient solution technique combining the conjugate gradient algorithm with fast Fourier transforms is developed. Findings - The eccentric air-gap technique offers better discretisation properties than the classical techniques based on remeshing. Thanks to the specialized solver, the computation times remain comparable. Originality/value - The introduction of eccentricity in the air-gap element used for finite element electrical machine simulation is a new development.
simulation electric machines finite element analysis iterative methods