Nonlinear Magnetic Field Analysis of DC Machines Part II. Application of the Improved Treatment

Based on methods described in Part I1 of the paper, the airgap radial inductions are calculated for four different rotor positions at full load and at one rotor position at twice full load. Line over-relaxation and additive acceleration of convergence techniques are used. Convergence criteria are described. Results of experiments to find suitable over-relaxation factors and expedient line integral paths for convergence accelerations are given. A computer program is detailed and applied to a 500 hp, 750 V, 4-pole, 300/900 r/min, dc motor.