Shark -new motor design concept for energy saving- applied to - VBN

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Chapter 5 Measurement and comparison of different motor types………………… ii 5.1 Objectives and methodology………………………………………………… 5.2 Experimental arrangements………………………………………………….. 5.3 Results of the steady-state tests……………………………………………… 5.4 Comparison of different motor types………………………………………... 5.5 Summary and conclusions………………………………...…………………. Chapter 6 Manufacturing considerations for the Shark Switched Reluctance Motor……………………………………………………………………. 6.1 Motivation and objective……………………………………………………. 6.2 Cutting of lamination and lamination stack for Shark Switched Reluctance Motor………………………………………………………………………… 6.3 Assembly solutions………………………………………………………….. 6.4 Windings………………………………………………………………….…. 6.5 Axial mounting…………………………………..………………………….. 6.6 Summary and conclusions………………………………..………………… Chapter 7 Summary and Conclusions……………………………………………… Appendix A Design data of IM, CSRM, Shark SRM and BLDCM……..………… A.1 Induction Motor……………………………………………………………. A.2 CSRM……………………………………………………………………… A.3 Shark SRM………………………………………………………………… A.4 BLDCM……………………………………………………………………. Appendix B………………………………………………….………………...……. B.1 Definition of the air gap layers for FEA…………………...………………. B.2 Error distribution in the air gap…………………………………………….. B.3 Saw-toothed air gap. Flux density distribution in the air gap……….……... B.4 Square-wave air gap. Flux density distribution in the air gap……………... B.5 Trapezoidal air gap. ……………………………………………………….. Appendix C…………………………………………………………………………. C.1 Langevin function approach………………………………………………… C.2 Calculation of the winding area………………...…………………………… C.3 Verification of the analytical model for 6/4 SRM…………………………... C.4 Verification of the analytical model for 12/8 SRM…..……………………... C.5 Permeance ratio……………………………………………………………… C.6 Radial and axial forces……………………………………………………… Appendix D Estimation of the relative prices of different motor technologies……. References………………………………………………………………………….. List of publications…………………………………………………………………. 117 117 120 121 131 143 145 145 146 151 154 155 156 157 159 159 161 163 165 169 169 170 172 174 176 180 180 181 183 184 185 185 188 189 199
Chapter 1 Introduction Chapter 1 Introduction The research documented in this thesis concerns the area of electrical machines design. It deals with a new design concept, which approaches the electrical machine from the viewpoint of the longitudinal cross-section. The proposed analysis is rooted in the intention to produce more torque without using more material. The new concept, which achieves an increase of the air gap area by modification of the cylindrical air gap of a motor to a non-linear shape, was named Shark [1], due to the similarity of the proposed air gap shape and sharks teeth. Specifically, this study is dedicated to the analysis of the Shark concept, to the development of an analytical model and to the comparison of the performance of the proposed Shark machine with those of the usual cylindrical air gap machines. The interest for the Shark concept is emphasised by the improvements to performance claimed in references [1], [2], [3], [4], [5], [6]. Seen in the context of the international policy to save energy, the Shark concept may be a potential solution to the reduction of energy usage in electrical machines. Therefore, the present study is aimed to provide a step forward for the introduction of this new concept to the manufacturers of electrical machines. The significance of the Shark concept, in terms of energy saving potential, is highlighted in the first section of this introductory chapter. The Shark concept is then briefly described in order to define the technical framework of the study. Subsequently, the electrical machine selected as the vehicle for demonstration is considered from two aspects. One aspect is the application area, which also gives an idea of the potential applications for the Shark concept. The second aspect regards the working principle of the demonstration machine and the variables to be used in the evaluation of the discussed concept. Variations of the demonstration machine, having as purpose the improvement of the energy conversion, are presented as well. Based on the above mentioned presentation of the Shark concept the objectives and methodology of the study are defined. An outline of the thesis concludes this introductory chapter. 1.1 Background and motivation Increasing awareness of the finite global energy resources requires a more efficient approach to its use. In this context, governmental regulations impose new standards [7] for more efficient energy conversion in industrial applications. On the other hand, consumer demand for cheap, energy saving products exerts new pressure on industrial manufacturers. Attempting to satisfy these two 1
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flux linkage [Wb] Chapter 3 Finite
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where where λ ( , θ ) 102 Chapter
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104 energy gain Chapter 4 Analytica
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106 Chapter 4 Analytical modelling
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112 radial force [N] 1900 1800 1700
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114 radial force [N] Chapter 4 Anal
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120 Chapter 5 Measurement and compa
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turn on angle [deg] 128 10 8 6 4 2
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140 copper loss [W] Chapter 5 Measu
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142 d. Power factor Chapter 5 Measu
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144 f. Specific torque Chapter 5 Me
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148 Chapter 6 Manufacturing conside
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158 Chapter 7 Summary and Conclusio
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Appendix A Design data of Induction
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170 Appendix B Definition of the ai
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178 air gap flux density [T] Append
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Appendix C 180 Appendix C Analytica
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A A A w1 w2 w3 182 = w ⋅ v = w =
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Appendix C.4 184 Appendix C Analyti
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Appendix C.5 Permeance ratio 186 Ap
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Appendix D Appendix D.1 188 Appendi
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190 References [16] T.J.E. Miller,
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192 References Conference, , 27 Jul
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194 Volume: 2 , 1996 , Page(s): 715
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196 References [96] F. Abrahamsen,
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188 References
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