Magnetic field distribution in the active zone of synchronous generators with electromagnetic excitation

This article presents an analytical procedure for calculating of two-dimensional magnetic field distribution in the active zone of synchronous generator with a field winding on the non-salient pole rotor. The analytical dependencies for electric motive force (EMF) and main reactance calculation are obtained. The prospects for the use of inverted construction of the synchronous machines in electric power installations are discussed. The developed approach in combination with the previously developed analytical method of calculation of synchronous generator with permanent magnets described in [1], allows determining the expression for magneto-motive force (MMF) of permanent magnet (PM) and MMF of the field winding which is produced from copper or high-temperature superconducting (HTS) wire. This enables evaluating the effectiveness of different constructions of machines (both with PM or electromagnetic excitation) and identifying conditions of the highest capacity of a single unit depending on the type of cooling.