Ned Mohan - Analysis and Control of Electric Drives

15 Chapter 15Fig. 15-1 Wind turbines with a complete power‐electronics interface [1].Fig. 15-2 Doubly fed generators (DFIGs) [1].Fig. 15-3 Cross‐section of a DFIG.Fig. 15-4 DFIG space vectors at the time t = 0; drawn with ω slip= +.Fig. 15-5 Rotor circuit one‐line diagram at slip‐frequency.Fig. 15-6 Flows of real and reactive power in a DFIG using a motoring conven...Fig. 15-7 d ‐axis aligned with the rotor flux; stator and rotor current vecto...Fig. 15-8 Space vector diagram for Example 15-1.Fig. 15-9 Space vector diagram for Example 15-2.Fig. 15-10 Vector control DFIG drive.Fig. 15-11 Simulation of Example 15-3.Fig. 15-12 Simulation results of Example 15-3.

16 Chapter 16Fig. 16-1 Block diagram of DTC.Fig. 16-2 Changing the position of stator flux‐linkage vector.Fig. 16-3 Inverter basic vectors and sectors.Fig. 16-4 Stator voltage vector selection in sector 1.Fig. 16-5 Simulation of Example 16-1.Fig. 16-6 Reference and estimated torque of Example 16-1.Fig. 16-7 Actual and estimated motor speed of Example 16-1.Fig. 16-8 Estimated stator flux of Example 16-1.

17 Chapter 17Fig. 17-1 Permanent‐magnet synchronous motor rotor structure.Fig. 17-2 Reluctance variation of permanent‐magnet synchronous machine.Fig. 17-3 Permanent‐magnet synchronous machine (shown with p = 2).Fig. 17-4 Per‐phase equivalent circuit in steady state ( ω min elec. rad...Fig. 17-5 Controller in the dq reference frame.Fig. 17-6 Simulation of Example 17-1.Fig. 17-7 Simulation results of Example 17-1.Fig. 17-8 Stator flux‐linkage space vector.Fig. 17-9 IPM motor position estimator and controller.Fig. 17-10 Rotor position and speed estimation.Fig. 17-11 Rotor position estimator linearized system transfer function.Fig. 17-12 Restructured rotor position estimator transfer function.Fig. 17-13 Simulation of Example 17-3.Fig. 17-14 Simulation result of Example 17-3.Fig. 17-15 Electromagnetic torque as a function of current space vector posi...Fig. 17-16 Real‐time SPM synchronous motor vector control.Fig. 17-17 Hardware speed and dq ‐current result.

18 Chapter 18Fig. 18-1 Position change in a stepper‐motor.Fig. 18-2 (a) Cross‐section of a primitive machine and (b) λ − i trajec...Fig. 18-3 Variable‐reluctance motor; excitation sequence a‐b‐c‐a ...Fig. 18-4 Two‐phase permanent‐magnet stepper‐motor; excitation sequence i a+,...Fig. 18-5 Axial view of a hybrid stepper‐motor.Fig. 18-6 Hybrid stepper‐motor excitation. (a) Phase‐ a excited with i a+and ...Fig. 18-7 Per‐phase equivalent circuit of a stepper‐motor.Fig. 18-8 Half‐excitation by exciting two phases.Fig. 18-9 Unipolar voltage drive for variable‐reluctance motor: (a) circuit ...Fig. 18-10 Bipolar voltage drive.Fig. 18-11 Cross‐section of a four‐phase 8/6 switched reluctance machine.Fig. 18-12 (a) Aligned position for phase‐ a and (b) unaligned position for p...Fig. 18-13 Typical flux‐linkage characteristics of an SRM.Fig. 18-14 Calculation of torque.Fig. 18-15 Performance assuming idealized current waveform.Fig. 18-16 Performance with a power‐processing unit.Fig. 18-17 Flux‐linkage trajectory during motoring.Fig. 18-18 Power converter for a four‐phase switched reluctance drive.Fig. 18-19 Estimation of rotor position.Fig. 18-20 Control block diagram for motoring.

1 Cover

2 Table of Contents

3 Begin Reading

1 iii

2 iv

3 xix

4 xx

5 xxi

6 xxi

7 1

8 3

9 4

10 5

11 6

12 7

13 8

14 9

15 10

16 11

17 12

18 13

19 14

20 15

21 16

22 17

23 18

24 19

25 20

26 21

27 22

28 23

29 24

30 25

31 26

32 27

33 28

34 29

35 30

36 31

37 32

38 33

39 34

40 35

41 36

42 37

43 38

44 39

45 40

46 41

47 42

48 43

49 44

50 45

51 46

52 47

53 48

54 49

55 51

56 52

57 53

58 54

59 55

60 56

61 57

62 58

63 59

64 60

65 61

66 62

67 63

68 64

69 65

70 66

71 67

72 68

73 69

74 70

75 71

76 72

77 73

78 74

79 75

80 76

81 77

82 78

83 79

84 80

85 81

86 82

87 83

88 84

89 85

90 86

91 87

92 88

93 89

94 90

95 91

96 92

97 93

98 95

99 96

100 97

101 98

102 99

103 100

104 101

105 102

106 103

107 104

108 105

109 106

110 107

111 108

112 109

113 110

114 111

115 112

116 113

117 114

118 115

119 116

120 117

121 118

122 119

123 120

124 121

125 122

126 123

127 124

128 125

129 126

130 127

131 128

132 129

133 130

134 131

135 132

136 133

137 134

138 135

139 136

140 137

141 138

142 139

143 140

144 141

145 142

146 143

147 144

148 145

149 146

150 147

151 148

152 149

153 150

154 151

155 152

156 153

157 154

158 155

159 156

160 157

161 158

162 159

163 160

164 161

165 163

166 165

167 166

168 167

169 168

170 169

171 170

172 171

173 172

174 173

175 174

176 175

177 176

178 177

179 178

180 179

181 180

182 181

183 182

184 183

185 184

186 185

187 186

188 187

189 188

190 189

191 190

192 191

193 192

194 193

195 194

196 195

197 196

198 197

199 198

200 199

201 200

202 201

203 202

204 203

205 204

206 205

207 206

208 207

209 208

210 209

211 210

212 211

213 212

214 213

215 214

216 215

217 217

218 218

219 219

220 220

221 221

222 222

223 223

224 224

225 225

226 226

227 227

228 228

229 229

230 230

231 231

232 232

233 233

234 234

235 235

236 236

237 237

238 238

239 239

240 240

241 241

242 242

243 243

244 244

245 245

246 246

247 247

248 248

249 249

250 250

251 251

252 252

253 253

254 254

255 255

256 256

257 257

258 258

259 259

260 260

261 261

262 262

263 263

264 264

265 265

266 266

267 267

268 268

269 269

270 270

271 271

272 272

273 273

274 274

275 275

276 276

277 277

278 278

279 279

280 280

281 281

282 282

283 283

284 285

285 286

286 287

287 288

288 289

289 290

290 291

291 292

292 293

293 294

294 295

295 296

296 297

297 298

298 299

299 300

300 301

301 302

302 303

303 304

304 305

305 306

306 307

307 308

308 309

309 310

310 311

311 312

312 313

313 314

314 315

315 317

316 318

317 319

318 320

319 321

320 322

321 323

322 324

323 325

324 326

325 327

326 328

327 329

328 330

329 331

330 332

331 333