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Nonintrusive efficiency evaluation method based on the air gap torque and rotor slot frequency is generally used in industry application. However, this method has the following problems: 1) the number of rotor slots should be given in advance; 2) with some special number of pole pairs and rotor slots, the stator and rotor slot harmonics may be aliasing, which may lead to great errors in identification...
Axial flux permanent magnet (AFPM) synchronous motors are attractive for low speed direct drive systems because of their high specific torque. The present paper proposes a novel axial flux machine topology, called MAGNUS, obtained by combining a yokeless central stator type NS arrangement with two external high polarity spoke-rotors, resulting in very high flux concentration. The stator, which includes...
This paper investigates a novel two-converters based operation of a Brushless Doubly Fed Reluctance Machine (BDFRM). The BDFRM has a ducted rotor, and the stator is wound with two distributed windings which are fed from two separate power converters. Operation theory with frequency sharing between the two windings is introduced and corresponding FEA simulations are analyzed. The proposed BDFRM design...
In this paper, reluctance synchronous machines are designed and optimised to operate in the 5 MW power range for the implementation as wind generators. It is shown, when assuming no rotor deformation, that reluctance synchronous generators can be comparatively designed to operate in this power range with power factors higher than 0.8 achieved. In order to further improve the machine performance, an...
Ultra-high speed switched reluctance machines (SRM) are becoming more and more promising due to its robustness and simple geometry. This paper proposed a detailed design procedure for an ultra-high speed SRM, including dimension calculation, material selection, winding selection, windage torque calculation, drive system and control strategy. The ultimate goal is to build a machine that is electromagnetically...
This paper presents a new investigation of the permanent magnet dimension selection for an AlNiCo based variable-flux machine based on the permanent magnet operating point. To do this, the magnetic features of an AlNiCo permanent magnet material are reviewed and an analytical method to estimate the magnetization level of the permanent magnet at different operation conditions is presented. Moreover,...
Variable flux memory (VFM) permanent magnet (PM) machines exhibit an additional degree-of-freedom for control, i.e. PM magnetization state, and thus excellent flux controllability. Moreover, the hybrid PM topologies having variable PM (VPM) with low coercive force and constant PM (CPM) with high coercive force at the same time, are employed to improve the torque density and the flux controllability...
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