Combination and Separation of Coordinates and Modular Programming for DC Machine Fields

The consideration of slotting in the armatures of dc machines increases the number of grid points to be considered beyond the capacity of normally available computers. To reduce the memory storage, a combination coordinate system characteristic to the parts of the lamination is proposed. To satisfy a large number of boundary conditions, a scheme is described to separate the rotor and stator lattices used for the calculation of the vector potentials. A modular scheme to take care of the profile repetitions in the armature is described. The flow charts of subprograms to be used with existing computer programs are given.