Načrtovanje in analiza sinhronskega stroja s trajnimi magneti in dvojnim rotorjem : doktorska disertacija

slovenian

doktorska dela

2013

Univerza v Mariboru, Fakulteta za elektrotehniko računalništvo in informatiko

This thesis proposes a design procedure, analysis and a prototype construction of a special double rotor permanent magnet synchronous machine (DRPMSM), which is meant for the use in a hybrid electric vehicle. The computer aided design process was based on calculations employing 2D and 3D finite element method. Finite element method is able to perform magnetic field calculations based on machine geometry dimensions considering the nonlinearities of the magnetic materials. In contrast to other work from literature, this work deals with radial-radial electric machine concept with one burried permanent magnet (PM) per pole on the outer rotor. Consequently, the target one PM per pole design demands specific magnetic flux barriers implemented in the outer rotor in order that minimum flux leakage is assured. Using one PM per pole can be more cost effective compared to machines from literature which utilize two PMs per pole. Moreover, in contrast to the surface mounted PMs, the problems associated with centrifugal forces at higher rotor speeds can be avoided by burying the PMs. Because of the newly proposed outer rotor design, special attention has been given to investigation of the most appropriate stator-slot/outer-rotor pole/inner-rotor slot number combination. The DRPMSM performance with six different slot-pole-slot combinations was evaluated based on post-processing of results from finite element analyses (FEA). Considering the fixed structure features and the given criteria, the best possible combination in the analysis presents the basis for the DRPMSM prototype construction. The FEA based DRPMSM design was manufactured as a prototype, which has been experimentally validated and its performance has been thoroughly evaluated under different operating conditions. The agreement between numerically calculated and measured results is good. Furthermore, an experimental method to determine the magnetic coupling between the active parts of the manufactured DRPMSM is proposed.

07.08.2023