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This paper proposes a systematic approach for the development of electric machine windings with reduced magnetomotive force (MMF) space harmonic content. By identifying the levels and slot position angles in the winding function of an electric machine winding, the winding factor, the magnitudes of individual harmonic components and thus the MMF spectrum of a winding can be represented mathematically as functions of the levels and angles. With numerical optimization, these functions can act as the constraints and the objective function. A typical formulation is to limit the magnitudes of undesired harmonics and to maximize the winding factor of the working component. The result of the optimization is often a new winding layout with potentially unequally pitched slots and different turns for the coils within a phase, and reduced or even eliminated harmonic orders of design interest, while maintaining a reasonable winding factor. The mathematical representation and design approach is applicable to both distributed windings and fractional-slot concentrated windings (FSCWs), with no special requirements on the slot/pole combination and the number of layers. Two design examples, a mixed-layer distributed winding and a 24-slot, 22-pole double-layer FSCW, are shown to have improved electromagnetic performance with finite element simulations. [ABSTRACT FROM AUTHOR]

The transformation of our lives through new technologies and globalisation presents educators with the challenge of helping students to develop the skills and competencies that will enable them to function successfully in this dynamic society. This article reports on a single-case pilot study conducted to trial and evaluate an educational program and support resources. The purpose of this research was to explore whether this educational program implemented within a technology-rich environment, incorporating teaching and learning strategies based on constructivist approaches, supports the development of multiliteracies. A Grade 10 English class in a high school in New South Wales, Australia participated in the educational program that involved the analysis, construction and evaluation of media and news items. The study addressed the question of how the participation in a media analysis and production curriculum unit, influences the development of multiliteracies. Students' understanding and use of key media, information, visual and technological concepts, as well as their understanding and use of technology were explored. The findings suggest that the implementation of such a program can assist students in developing multiliteracies and that most students found the experience of digital video construction motivating. Based on the findings from the pilot study the educational program and resources were revised and refined prior to the implementation of the study across multiple cases in the subsequent academic year. [ABSTRACT FROM AUTHOR]

Presents information about the effect of cultural backgrounds of children with their art creations. Examples; Media; Art style.