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

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10 Chapter 1 Introduction deals with a combination of the two solutions a brief study of the design proposed so far may be of interest. In table 1.2 some variations of SRM are illustrated and their improvements are specified. Table 1.2 Illustration of various configurations of SRM 1 SRM with DC assisted excitation [47], [117], [118] This variation of SRM pushes the conversion loop in the region of high saturation where the energy ratio is close to 1. However, it does not use effectively the copper of the machine. 2 Hybrid type SRM [48] Produces additional torque by the presence of the permanent N magnets 3 PM-biased SRM [49], [119] 4 Screens in SRM [50], [120], [121] 5 SRM with segmental rotors [51], [52] 6 SRM with both radial and axial air gap [2] + F - C A - + - + B - S PM Additional torque is produced by PM Reduces the unaligned inductance but the performance depends on the diffusion time of the eddy current induced in the screen This variation of SRM utilises better the phase MMF This variation increases of the air gap surface
Chapter 1 Introduction 1.5 Area of application of the SRM The area of application of the SRM is extending at present. The SRM offers some attractive features compared to other types of electrical machines. These are summarised below: • The stator is easy to wind, and has short end windings which reduces the winding resistance turns [16], [17] • No windings or magnets fitted on the rotor • strong, stiff rotor construction offers potential for high speed applications • inherent fault tolerance is caused by that the phases are decoupled electrically [16], [18], [19], [20], [21], [107] • simple to wind stator coils cost vs. efficiency favourable relative to other motors, including BLDCM [44]. • Rugged construction of the SRM is suitable for application in harsh environments (vibration, temperature, low risk of sparks) [39], [41]. Despite the constructional advantages, the SRM has some weak points such as high torque ripple and high level of noise and vibration. Although the torque ripple and the high vibration level are often cited as main disadvantages of the SRM drive, solutions to solve these problems have been proposed [22], [108], [109], [110]. To establish the area of application of the design alternative proposed in this thesis, the Shark concept, a brief account of some recent application proposed for the SRM is given in the following paragraph. Due to the previously mentioned advantages, the applications of the SRM may become more numerous, as the unwillingness of the consumers to apply SRM drives begins to die away. The trend for SRM application may be toward niche sectors where general solutions are not desirable. Worldwide research in SRM technology is conducted in the following subjects: • Magnetic levitation, where linear SRM drive system is used [23] • Automotive applications [24], [25], [26], [27], [28], [39] • Industrial transportation [29], [30], [31] • Wind energy, where the SRM is used as generator [32], [33] • Pumps [34], [35], [10] • Aerospace industry [34], [35], [36], [37], [40]. In addition to research activity, the SRM technology has also found its way to production. The latest known production applications are summarised below: • S R Drives, now a division of Emerson Electric Co. provides SRM technology for various applications [39], [41] such as: o Beckman Instruments Inc, laboratory centrifuge system o Flameproof drive system for potentially explosive atmosphere (150kW DIAMOND Drive underground at Malby Colliery, UK) o BESAM sliding door operating system o CompAir Broomwade Limited, screw air compressors 11
Page 1: Shark -new motor design concept for
Page 6 and 7: Abstract The aim of this thesis is
Page 8 and 9: i instantaneous current Ψ ϕ flux
Page 13 and 14: Table of contents Preface………
Page 15 and 16: Chapter 1 Introduction Chapter 1 In
Page 17 and 18: Chapter 1 Introduction Table 1.1 Fu
Page 19 and 20: Chapter 1 Introduction The magnetic
Page 21 and 22: Chapter 1 Introduction Fig.1.7 Illu
Page 23: [Wb] O Wf Wconv Fig. 1.9 Conversion
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Page 31 and 32: Chapter 2 Chapter 2 Linear analysis
Page 33 and 34: Chapter 2 Linear analysis of the Sh
Page 35 and 36: ( y) Chapter 2 Linear analysis of t
Page 45 and 46: ksquare Lsquare L0 Chapter 2 Linear
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Page 49 and 50: inductance gain 4 3.5 3 2.5 2 1.5 C
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Chapter 3 Finite Element modeling o
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flux linkage [Wb] Chapter 3 Finite
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Chapter 4 Chapter 4 Analytical mode
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Chapter 4 Analytical modelling of t
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N s because there are ph Chapter 4
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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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