Design optimisation of cageless flux barrier rotor reluctance synchronous machine

[摘要] ENGLISH ABSTRACT:The focus of this thesis is on the overall (stator and rotor) design optimisation of the current vector-controlled reluctance synchronous machine and the evaluation of the steady-state performance of this machine in motoring operation. The rotor considered is the cageless normal laminated flux barriertype of rotor.The absolute optimum-designed electrical machine can at best be obtained by using the finite element method in the design optimisation process. This thesis proposes a multidimensional finite element-based design optimisation method for the optimum design of the reluctance synchronous machine.The thesis stresses the explanation and understanding of the optimum-designed reluctance machine. A simple approximate magnetic circuit calculation method is used to show and explain design tendencies and to do preliminary stator design optimisations. Goodness factors for the reluctance synchronous machine are also derived. The optimised results of a number of reluctance synchronous machines that are designed according different criteria in the 3 - 10 kW power range are given and explained. A great deal of attention is also given to the performance capability of the reluctance: synchronous machine in the medium power range (sub 500 kW).The thesis shows that the proposed optimisation method can be applied with success to optimise the design of the reluctance synchronous machine. The optimum steady-state performance of the reluctance synchronous machine found in this study shows that this machine can no longer be considered as a bad machine. Although the power factor of this machine is still on the low side, theadvantages of high power density and high efficiency, even in the upper-medium power range, are attractive characteristics for any variable speed drive.

[发布机构] Stellenbosch University