| Three contributions to the area of modeling of energy conversion devices are presented. First, a new analytic model for the switched reluctance motor is developed in which flux-linkages rather than machine currents are used as the state variable, and which includes a provision for mutual inductance representation between phases. The new model is simple and efficient from a computational viewpoint, and the flux-linkage representation insures that zero current in a phase corresponds to zero flux-linkage due to that phase, thereby avoiding numerical errors inherent in other representations. A new approach developed for determining the flux-linkage parameters also improves the interpolation characteristics of the flux-linkage representation.; The second contribution is a new means of obtaining a rotor-position-invariant machine description in which state variables are constant in the steady state. This method is best suited to machines that saturate magnetically and in which the inductances vary non-sinusoidally with position; herein a switched reluctance machine is used as an example. The final contribution is a method of using a reduced-scope detailed computer simulation in the context of an average value model. This could be used in a variety of systems having state-dependent switching, but it is again applied herein to a switched reluctance drive. These contributions are presented in two separate papers. |
