PowerPoint PresentationChapter 17 AC MachinesSlide 3Slide 4Rotating Stator FieldSlide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Synchronous SpeedSlide 15Slide 16Slide 17Slide 18Squirrel-Cage Induction MachinesSlip and Slip FrequencySlide 21Effect of Rotor Inductance on TorqueSlide 23Slide 24Torque–Speed CharacteristicSlide 26Slide 27Slide 28Slide 29Induction-Motor Equivalent CircuitPhase versus Line QuantitiesSlide 32Slide 33Power and Torque CalculationsSlide 35Slide 36Slide 37Slide 38Slide 39Selection of Induction MotorsSlide 41SYNCHRONOUS MACHINESElectrical AnglesField ComponentsSlide 45Slide 46Slide 47Equivalent CircuitSlide 49Potential for Power-Factor CorrectionOperation with Variable Load and Constant Field CurrentSlide 53Slide 54Operation with Constant Load and Variable Field CurrentSlide 56Slide 57Slide 58Starting MethodsSlide 60Slide 61Slide 62Basic Single-Phase Induction MotorSlide 64Slide 65Slide 66Auxiliary WindingsSlide 68Shaded-Pole MotorsSlide 70STEPPER MOTORSELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.Chapter 17AC MachinesELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.Chapter 17AC Machines1. Select the proper ac motor type for various applications.2. State how torque varies with speed for various ac motors.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.3. Compute electrical and mechanical quantities for ac motors.4. Use motor nameplate data.5. Understand the operation and characteristics of three-phase induction motors, three-phase synchronous machines, various types of single- phase ac motors, stepper motors, and brushless dc motors.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.Rotating Stator FieldWe see that the stator windings of three-phase induction machines set up magnetic poles that rotate around the circumference of the stator.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.   costKiBaa  120cos tKiBbb  240cos tKiBccELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.        240cos120coscosgaptKitKitKiBcba   tItimacos  120cos  tItimb  240cos  tItimcELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.      120cos120coscoscosgaptKItKIBmm   240cos240cos tKIm          yxyxyx  coscos21coscos      ]480cos240cos [cos21cos23gaptttKItKIBmmELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.     0480cos240coscos ttt  tBBmcosgapThus, the field in the gap rotates counterclockwise with an angular speed ω.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.Synchronous Speed2PsPfns120ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.The direction of rotation of a three-phase induction motor can be reversed byinterchanging any two of the three line connections to the three-phase source.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.Squirrel-Cage Induction MachinesELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.Slip and Slip FrequencysmssmsnnnssslipELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.Effect of Rotor Inductance on TorqueccccLjsRVIELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.Torque–Speed CharacteristicFor small values of slip, developed torque is proportional to slip.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.Motor designers can modify the shape of thetorque–speed curve bychanging various aspects of the machine design such as the cross section and depth of the rotor conductors.ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc.ELECTRICAL ENGINEERING: PRINCIPLES AND