Glossary Of Symbols

GLOSSARY OF SYMBOLS

PRINCIPAL SYMBOLS a, b, c d E e e ^

f

I I i i J L m n P P

switching variables duty ratio energy, J space vector of EMF, V instantaneous EMF, V space vector of magnetomotive force, A frequency, Hz phasor of current, A constant value of current (e.g., rms or peak), A space vector of current, A instantaneous current, A mass moment of inertia, kgm^ inductance, H modulation index, or mass, kg rotational speed, r/min real power, W differentiation operator (d/dt), s~^

221

222

CONTROL OF INDUCTION MOTORS

Pp

R S s T t u V V V

V

X a, P, 9 11

0 A A \ a T (0

number of pole pairs resistance, ft apparent power, VA slip torque, Nm, or period, s time, s linear speed, m/s phasor of voltage, V constant value of voltage (e.g., rms or peak), V space vector of voltage, V instantaneous voltage, V reactance, ft angle, rad efficiency angular position, rad phasor of flux, Wb rms value of flux, Wb space vector of flux, Wb leakage factor time constant, s angular velocity or radian frequency, rad/s

SUBSCRIPTS A, B, C a, b, c act br c cm cr D d dc elec eq f h i, in L l,a M m

phase A, phase B, phase C phase A, phase B, phase C actual braking capacitive common mode critical D-axis of revolving reference frame d-axis of stator reference frame direct current electrical equivalent field or flux high frequency input line or load leakage motor magnetizing or peak

GLOSSARY OF SYMBOLS

max mech N o out Q q R,r S, s rat sh si smp St

sw syn

maximum mechanical neutral rotor of two-pole equivalent motor output Q-axis of revolving reference frame q-axis of stator reference frame rotor stator rated slot harmonic slip sampling starting switching synchronous

SUPERSCRIPTS e s T * ;

revolving reference frame stator reference frame transposed conjugate or reference estimated

ACRONYMS ANFIS ARCP CSI CVH DFO DSC DSP DTC EDM EMF EMI ESO FFT FO

Adaptive NeuroFuzzy Inference System Auxiliary Resonant Conmiutated Pole Current Source Inverter Constant Volts/Hertz Direct Field Orientation Direct Self-Control Digital Signal Processor Direct Torque Control Electric Discharge Machining Electromotive Force Electromagnetic Interference Essential Service Override Fast Fourier Transform Field-Oriented

223

224

CONTROL OF INDUCTION MOTORS

GTO IFO IGBT ITR MI MMF MRAS PF PI PLL PWM RDCL RF SCR SV SVPWM THD VSC VSI ZCS ZVS

Gate Tum-Off Thyristor Indirect Field Orientation Insulated Gate Bipolar Transistor Ideal Transformer Machine Intelligence Magnetomotive Force Model Reference Adaptive System Power Factor Proportional-Integral Phase-Locked Loop Pulse Width Modulation Resonant DC Link Radio Frequency Silicon Controlled Rectifier Sensorless Vector Space Vector Pulse Width Modulation Total Harmonic Distortion Variable Structure Control Voltage Source Inverter Zero-Current Switching Zero-Voltage Switching