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

More documents

Recommendations

Info

6 Chapter 1 Introduction The Switched Reluctance Machine is considered to have the simplest construction and working principle of all rotating electric machine types. The basic structure of an SRM comprises salient stator and rotor poles as shown in Fig.1.6. A coil is wound around each stator pole and no windings or magnets are located on the rotor. Because of this simple configuration, the SRM may be cheaper to manufacture than any other type of electrical machine [44]. stator winding Fig.1.6 Basic structure of the SRM phase B phase A 6 stator poles 4 rotor poles phase C aligned position on phase A The operation of the SRM is based on the tendency of the rotor poles to align with the excited pair of stator poles. Taking as origin of the movement the unaligned rotor position illustrated in Fig.1.6, a voltage is supply to phase B or phase C depending on the direction of movement when the rotor is in the position known as turn on angle. This makes that the rotor moves such as the rotor and the excited stator pole pairs are aligned. When the rotor is in a position known as turn off angle, the supplied voltage is removed from the excited coil and switch to a neighbour coil. By successively switching the supply voltage from one coil to another, the continuous movement of the rotor is assured. Some characteristic definitions used to describe the operation of the SRM are: • The aligned position. This is where a pair of rotor poles is aligned with one pair of stator poles (see Fig.1.6) • The unaligned position. This is where a pair of stator poles is aligned with an interpolar axis of the rotor • The corner position. This is where rotor and stator poles are about to overlap • The turn on angle is the position of the rotor at the time when the electrical supply is applied to the corresponding phase. This is measured from the unaligned rotor position. • The turn off angle is the position of the rotor at the time when the electrical supply is removed/ reversed from the corresponding phase. This is also measured from the unaligned rotor position. The description of the working principle of a SRM is best explained using the magnetisation characteristic. The magnetisation characteristic or flux linkage as a function of the current (Fig.1.7) is a diagram describing the magnetic flux induced in a specific configuration of magnetic circuit by a steady-state electrical current flowing through the excitation windings. One magnetisation characteristic may be drawn for any rotor position.
Chapter 1 Introduction Fig.1.7 Illustration of the magnetisation characteristic, co-energy and field energy The magnetisation curve depends on the magnetic properties of the material (permeability and saturation flux density) and on the geometry of the magnetic circuit (air gap length, etc.). It also characterises the energy stored in the magnetic field for any rotor position, i , and for any excitation current. This stored energy is denoted by Wf in Fig.1.7 and may be determined mathematically as follows: W f i d (1. 1) 0 The co-energy, which is complementary to the field energy has no physical significance but it helps in simplifying the calculation. It may be defined as follows: i W 0 di [Wb] O field energy Wf magnetisation characteristic co-energy W (1. 2) The instantaneous torque may be determined by considering an infinitesimal rotation of the rotor between two positions 1 and 2 . The energy stored in the magnetic circuit in position 1 is equal ' to the area 0AA in Fig.1.8. During the displacement between 1 and 2 , energy is supplied to the ' ' magnetic circuit, represented by the area A ABB . Only a fraction of this energy is converted into mechanical energy during the actual movement. The remainder of the supplied energy remains stored in the magnetic circuit or is returned to the source if the excitation supply is removed. i 7
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: Chapter 1 Introduction The magnetic
Page 23 and 24: [Wb] O Wf Wconv Fig. 1.9 Conversion
Page 25 and 26: Chapter 1 Introduction 1.5 Area of
Page 27 and 28: Chapter 1 Introduction Based on the
Page 29 and 30: Chapter 1 Introduction Chapter 3, F
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
Page 47 and 48: L Chapter 2 Linear analysis of the
Page 49 and 50: inductance gain 4 3.5 3 2.5 2 1.5 C
Page 53 and 54: Chapter 3 Chapter 3 Finite Element
Page 55 and 56: Chapter 3 Finite Element modeling o
Page 71 and 72:
Chapter 3 Finite Element modeling o
Page 73 and 74:
1 Chapter 3 Finite Element modeling
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
flux linkage [Wb] Chapter 3 Finite
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Chapter 4 Chapter 4 Analytical mode
Page 91 and 92:
Chapter 4 Analytical modelling of t
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
N s because there are ph Chapter 4
Page 111 and 112:
Page 113:
Page 116 and 117:
where where λ ( , θ ) 102 Chapter
Page 118 and 119:
104 energy gain Chapter 4 Analytica
Page 120 and 121:
106 Chapter 4 Analytical modelling
Page 122 and 123:
Page 124 and 125:
Page 126 and 127:
112 radial force [N] 1900 1800 1700
Page 128 and 129:
114 radial force [N] Chapter 4 Anal
Page 130 and 131:
Page 132 and 133:
Page 134 and 135:
120 Chapter 5 Measurement and compa
Page 136 and 137:
Page 138 and 139:
Page 140 and 141:
Page 142 and 143:
turn on angle [deg] 128 10 8 6 4 2
Page 144 and 145:
Page 146 and 147:
Page 148 and 149:
Page 150 and 151:
Page 152 and 153:
Page 154 and 155:
140 copper loss [W] Chapter 5 Measu
Page 156 and 157:
142 d. Power factor Chapter 5 Measu
Page 158 and 159:
144 f. Specific torque Chapter 5 Me
Page 160 and 161:
Page 162 and 163:
148 Chapter 6 Manufacturing conside
Page 164 and 165:
Page 166 and 167:
Page 168 and 169:
Page 170 and 171:
Page 172 and 173:
Page 174 and 175:
158 Chapter 7 Summary and Conclusio
Page 176 and 177:
Page 178 and 179:
Page 180 and 181:
Appendix A Design data of Induction
Page 182 and 183:
Page 184 and 185:
Page 186 and 187:
Page 188 and 189:
170 Appendix B Definition of the ai
Page 190 and 191:
Page 192 and 193:
Page 194 and 195:
Page 196 and 197:
178 air gap flux density [T] Append
Page 198 and 199:
Appendix C 180 Appendix C Analytica
Page 200 and 201:
A A A w1 w2 w3 182 = w ⋅ v = w =
Page 202 and 203:
Appendix C.4 184 Appendix C Analyti
Page 204 and 205:
Appendix C.5 Permeance ratio 186 Ap
Page 206 and 207:
Appendix D Appendix D.1 188 Appendi
Page 208 and 209:
190 References [16] T.J.E. Miller,
Page 210 and 211:
192 References Conference, , 27 Jul
Page 212 and 213:
194 Volume: 2 , 1996 , Page(s): 715
Page 214 and 215:
196 References [96] F. Abrahamsen,
Page 216 and 217:
188 References
show all

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

Create successful ePaper yourself

Delete template?

Save as template?