Page 116 - Industrial Power Engineering and Applications Handbook

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Static Controls and

Braking of Motors

Contents 6.16.2 Soft %tanning 61140
Y
LI
6.16 3 Slip-recoverj system (to control nouiid rotor
6.1 Speed control in squirrel cage motors 6/99 motors) 61140
6 1 1 One winding 6/99 6.16.4 Application of solid-state technolocy in the
6 1.2 Two windings 6/99 operation of a process plant 61142
6.5 Other application5 61144
6.2 Speed control through solid-stat
6 2.1 Theory of application 6/ peed variation through variable-5peed fluid couplin,nq 6il-I.i
6 2.2 Effectc of vaiiablc-supply parameters on the
performance of an induction motor 61101 6.1 8 Static drive verbu\ fluid coupling 61135
6.19 D.C. drives 61147
6.3 V/f control (speed control at constant torque) 61101
6.4 Phacor (vector) control 6/103 6 20 Braking 61147
6.4 1 Single phasor (tector) control 6/104 6.20 1 Types of braking 6/15 I
6 4 2 Field-oriented control (FOC) 6/106 Induction generators 6i1.56
6 4.3 Direct torque control (DTC) 6/108
Inching or logging 61161
6.5 Uqe of phasor control for flux braking 6/11 1
6.23 Number of starts and stops 61161
6.6 Control and feedback devices 611 11
6 6 1 Speed sensor5 611 1 1 List of forinulae used 61163
6.7 Application of solid-state technology 611 11 Further reading 61163
6 7 1 Power diodes 611 12
6.7.2 The power transimr famil State agencies in India for micro citing of windmill\ 61163
6 7.3 The thyristor family 61114
6.8 Conduction and commutation 6/11
6.9 Circuit configurations of semicondn
6 9 1 Coni erter or rectifier unit 61
6.9.2 Inverter unit 611 19
6.9.3 Voltage source iiivertei (VSI) using IGBT5 61125
6 9.4 Current source inverter (CSI) 611 26
6 9.5 Cyclo converters (frequency converters) 6/127
6.9.6 The regenerative schemes 61127
6.10 Smoothing ripples in the d.c link 6/12
6.1 I Providing a constant d.c. voltage sourc
6.12 Providing a constant current source 6/129
6.13 Generation of harmonics and xwitching surges in a
static device switching circuit 6/129
6.13 1 Supprehmg the harmonic\ 6/130
6.14 Protection of semiconductor devicez and motors 6/13
6.14 I Overvoltages and voltage surges caused by
disturbance\ in an LT 5ystem 611 30
6.15 Energy conservation through did-state te
6.15 1 Illustration of energy conservation
6 15.2 computation of energy saving 61135
6.16 Application of static drives 61138
6.16 I Soft staiting (VJcontrol) 6/13