© The McGraw-Hill Companies, Inc McGraw-Hill 1 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I 17 Introduction to Electric Machines

© The McGraw-Hill Companies, Inc McGraw-Hill 2 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I Figure 17.4 Torque-speed and efficiency curves for an electric motor

© The McGraw-Hill Companies, Inc McGraw-Hill 3 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I Figure 17.6 Generator and motor action in an electric machine

© The McGraw-Hill Companies, Inc McGraw-Hill 4 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I Figure 17.8 A two-pole machine with salient stator poles Excitation currentI f Armature conductors Reaction torque Rotor torque Field winding Yoke Cross section of DC machine N S Pole T B S B R T' m

© The McGraw-Hill Companies, Inc McGraw-Hill 5 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I Figure Electrical circuit model of a separately excited DC machine

© The McGraw-Hill Companies, Inc McGraw-Hill 6 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I Figure DC motor operating characteristics

© The McGraw-Hill Companies, Inc McGraw-Hill 7 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I Figure Two-pole three-phase stator

© The McGraw-Hill Companies, Inc McGraw-Hill 8 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I Figure (a) Squirrel-cage induction motor; (b) conductors in rotor; (c) photo of squirrel-cage induction motor; (d) views of Smokin’ Buckeye motor: rotor, stator, and cross section of stator

© The McGraw-Hill Companies, Inc McGraw-Hill 9 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I Figure Circuit model for induction machine

© The McGraw-Hill Companies, Inc McGraw-Hill 10 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I Figure Rotor circuit + – I R E R0 jX R0 R R S

© The McGraw-Hill Companies, Inc McGraw-Hill 11 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I Figure Equivalent circuit of an induction machine

© The McGraw-Hill Companies, Inc McGraw-Hill 12 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I Figure Performance curve for induction motor T,% a b c d e No-load speed n s n

© The McGraw-Hill Companies, Inc McGraw-Hill 13 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I Figure Induction motor classification T D C A B nn s

© The McGraw-Hill Companies, Inc McGraw-Hill 14 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I Figure General configuration of adjustable-frequency drive Intermediate circuit Control and regulation circuit Rectifier ~ ~ ~ Inverter Motor