Page 15 - Electric Machinery Fundamentals

TABLE OF CONTENTS xv

The Development of Induced Torque in all Induction
Motor / The Concept of Rotor Slip / The Electrical
Frequency on the Rotor
6.3 The Equivalent Circuit of an Induction Motor 315
The Transformer Model of an Induction Motor / The Rotor
Circuit Model/ The Final Equivalent Circuit
6.4 Power and Torque in Induction Motors 321
Losses and Ihe Power-Flow Diagram / Power and Torque
in an Induction Motor / Separating the Rotor Copper
Losses and the Power Converted in an Induction Motor's
Equivalent Circuit
6.5 Induction Motor Torgue-Speed Characteristics 328
Induced Torque from a Physical Standpoint/The Derivation
of the Induction Motor Induced-Torque Equation I
( Comments on the Induction Motor Torque-Speed Cunle /
Maximwll (Pullout) Torque in an Induction Motor
6.6 Variations in Induction Motor Torque-Speed Characteristics 343
Control of Motor Characteristics by Cage Rotor DeSign /
Deep-Bar and Double-Cage Rotor Designs / Induction
Motor Design Classes
6.7 Trends in Induction Motor Design 353
6.8 Starting Induction Motors 357
Induction Motor Starting Circuits
6.9 Speed Control of Induction Motors 363
Induction Motor Speed Control by Pole Changing / Speed
Control by Changing the Line Frequency / Speed Control
by Changing the Line Voltage / Speed Control by
Changing the Rotor Resistance
6.10 Solid-State Induction Motor Drives 372
Frequency (Speed) Adjustment / A Choice o/Voltage and
Frequency Patterns / Independently Adjustable
Acceleration and Deceleration Ramps / Motor Protectioll
6.11 Detennining Circuit Model Parameters 380
The No-Load Test / The DC Tesl for Stator Resistance /
The Locked-Rotor Test
6.12 The Induction Generator 388
The Induction Generator Operating Alone / Induction
( Generator Applications
6.13 Induction Motor Ratings 393
6.14 Summary 394
Questions 396
Problems 397