Cogging torque sensitivity in design optimisation of low cost non-overlap winding PM wind generator

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Optimum design and technology evaluation of slip permanent magnet generators for wind energy applications

IngenieursweseElektriese En Elektroniese IngeniePlease help us populate SUNScholar with the post print version of this article. It can be e-mailed to: [email protected]

Design specifications and optimisation of a directly grid-connected PM wind generator

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Design considerations in the implementation of an electromagnetic brake for a 15 kW PM wind generator

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Design of new concept permanent magnet induction wind generator

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Evaluation of calculation methods and the effect of end-winding inductance on the performance of non-overlap winding PM machines

IngenieursweseElektriese En Elektroniese IngeniePlease help us populate SUNScholar with the post print version of this article. It can be e-mailed to: [email protected]

Grid connected VSC-HVDC Wind Farm System and Control Using Permanent Magnet Induction Generators

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Experimental validation of a thermal model for high-speed switched reluctance machines for traction applications

This paper presents the experimental validation of a novel cooling concept applied to a high-speed switched reluctance machine topology for traction applications. By circulating the coolant between the coils and the stator poles, the winding and the stator iron are virtually thermally decoupled. A number of test motorettes are used to demonstrate the potential of the cooling concept at current density values up to 27 A/mm 2 continuously. The measurements are also used to validate a thermal model of the machine, and further improvements of both the model and the experimental setup are proposed

Evaluation of a permanent magnet excited induction generator for renewable energy applications

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The quantification of grazing capacity from grazing and production values for forage species in semi-arid grasslands of southern Africa

The relation between rangeland condition and grazing capacity was determined along a degradation gradient. In studying agronomic values of forage species, the average production per tuft was combined with its grazing preferences, to link grazing values for species in the semi-arid grasslands of southern Africa. A production index, based on mean mass per tuft, was first compiled for species. Preference utilisation ratio of species was estimated for each of cattle and sheep, from the proportion of each species found in the diet relative to the proportion of the species found in the forage on offer. A microhistological technique was applied to oesophageal fistula samples to determine the proportion of each species found in the diet. Grazing values and grazing index were determined from the production and preference utilisation ratio of species. Where grazing values of species were determined subjectively in the past, in this study species were objectively classified based on estimated grazing values. Meaningful relationships between rangeland condition and grazing capacity were determined, along a degradation gradient, with the long-term coefficient of forecasting more than 75%. The financial implication with respect to sustainable animal production and rangeland condition variation was also calculated. Keywords: Preference utilisation ratio; preference utilization ratio; grazing value; palatability; production potential; utilisation; utilization; rangeland condition African Journal of Range & Forage Science 2001, 18(1): 43-5