In this chapter you will learn the following: ² The concepts of power, (real reactive and apparent) and power factor ² The operation of threephase systems and the characteristics of balanced loads in Y and in ¢ ² How to solve problems for threephase systems | Notes for an Introductory Course On Electrical Machines and Drives MSU Electrical Machines and Drives Laboratory Contents Preface ix 1 Three Phase Circuits and Power 1 Electric Power with steady state sinusoidal quantities 1 Solving 1-phase problems 5 Three-phase Balanced Systems 6 Calculations in three-phase systems 9 2 Magnetics 15 Introduction 15 The Governing Equations 15 Saturation and Hysteresis 19 Permanent Magnets 21 Faraday s Law 22 Eddy Currents and Eddy Current Losses 25 Torque and Force 27 3 Transformers 29 Description 29 The Ideal Transformer 30 Equivalent Circuit 32 Losses and Ratings 36 Per-unit System 37
