Comparison of Iterative Solutions of the Finite Difference Method with Measurements as Applied to Poisson´s and the Diffusion Equations

The finite difference method, as developed at the University of Colorado [1,2,3,4] for the numerical solutions of the nonlinear counterparts of Laplace´s, Poisson´s, and the diffusion partial differential equations, yields calculated solutions that agree well with experimental results on several turboalternators. Computed no-load characteristics and local flux distributions are compared with measurements. In addition, it is shown that the Carter coefficients depend not only on slot and tooth dimensions but also on the curvature of stator and rotor. Subsequently, calculated excitation currents, synchronous reactances, and some eddy current distributions are compared with measurements.