电机学英文版课件ppt.ppt

Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-0Electric Machinery and Drive Fall Semester 2009Dept. of Electrical EngineeringCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-1PowerPoint Slidesto accompanyElectric MachineryFourth EditionStephen J. ChapmanChapter 1Introduction to Machinery PrinciplesCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-2Objectives To instill an understanding of the underlying electromagnetic effects permitting electric machine operation and introduce basic machine types To describe the construction of these machines To examine the main types of these machines To be skilled in analyzing the characteristic of these machinesIntroduction and OverviewCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-3Reference Books 1.Theodore Wildi. Electrical Machines, Drives, and Power Systems (Fifth Edition) Pearson Education. 2002 2. A. E. Fitzgerald, Charles Kingsley, Jr., Stephen D. Umans Electric Machinery (Sixth Edition) McGraw-Hill.2003 3. 李发海 王岩. 电机与拖动基础 北京：清华大学出版社，1994. 4. 顾绳谷. 电机及拖动基础(上、下册) 北京：机械工业出版社，19805. 汤蕴缪 史乃. 电机学 第二版 北京：机械工业出版社，2005.16. 姚舜才付 巍 赵耀霞 电机学与电力拖动技术 北京：国防工业出版社，2006.1Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-4What is an Electric-Machine Drive?Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-5Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-6Type of Electrical MachinesEMMotorGeneratorDC MotorAC MotorSeparately ExcitedNon-Separately ExcitedSeriesShuntCompoundSynchronousAsynchronousSingle PhaseDouble PhaseThree PhaseDC GeneratorAC GeneratorCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-7Angular PositionAngular VelocityAngular AccelerationCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-8Torque T T=(Force Applied) (Perpendicular Distance) =(F)(r sin )Newtons Law of Rotation T=JWork WPower PCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-9Electric Drives An electric drive is a system that converts electrical energy to mechanical energy Parts: electric motor (or several) control system (including software) Constant-speed drives only a start/stop and protection system in addition to the electric motor Variable-speed drives (VSDs) include an electronic power converterCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-10Electric Drive and the Surrounding SystemCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-11Acceleration of Inertial Mass Torque needed for accelerating the moment of inertia J: Moment of inertia ofa thin-walled cylinderCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-12 Moment of inertia of a solid cylinderEquation of MotionCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-13 Inertia J is a theoretical parameter. In engineering, Fly Wheel GD2 is used to replace inertia. That is： Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.Simple magnetic circuit.Figure 1.11-14Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.Magnetic circuit with air gap.Figure 1-31-15Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-16Production of a Magnetic Field Amperes Law H =magnetic field intensity (Ampere-turns per meter) B=magnetic flux density/ intensity of magnetic induction =magnetic permeabilityCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-17Magnetic fluxMagnetomotiveMagnetic reluctanceCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-18Analogy between electric and magnetic circuits. (a) Electric circuit, (b) magnetic circuit.Figure 1-4Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-19Kirchhoffs Law in Magnetic CircuitCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-20lINCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-21Air-gap fringing fields.Figure 1-6Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-22Simple synchronous machine.Figure 1-9Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-23(a) Magnetic circuit and (b) equivalent circuit for Example 1.3.Figure 1.6Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.1-24MATLAB plot of inductance vs. relative permeability for Example 1.5.Figure 1.7Copyright The McGraw-Hill Compani。