Two‐dimensional analytical model for double field excitation synchronous machines

• Main Authors: Alireza Hosseinpour, Mohammad Mardaneh, Akbar Rahideh
• Format: Article
• Language: English
• Published: Wiley 2021-03-01
• Series: IET Generation, Transmission & Distribution
• Online Access: https://doi.org/10.1049/gtd2.12082

Abstract This paper examines a two‐dimensional analytical magnetic model presented for double excitation synchronous machines (DESMs). DESMs employ both permanent magnets (PMs) and excitation coils (ECs), and therefore they offer the advantages of permanent magnet synchronous machines and electrically excited synchronous machines. Due to the linearity assumptions, the problem is divided in three sub‐problems: magnetic field of the PMs, magnetic field of the ECs, and magnetic field of the armature reaction. ECs, which have non‐overlapping structure, are in the rotor slots and carrying DC currents. The armature reaction field prediction is presented for both overlapping and non‐overlapping windings. The magnetic flux density of a brushless PM motor with six stator slots and four rotor slots has been calculated by the proposed analytical method. The results of the analytical method are compared with those of the finite element method to evaluate the effectiveness of proposed model. The presented model can be used for machines with any radius independent magnetization pattern PM and here radial, parallel and multi‐segment Halbach magnetization patterns are used as examples. Moreover, results are validated by numerical method.