CONTENTS 



PREFACE 



LIST OF SYMBOLS 



CHAPTER I 



INTRODUCTORY 1 



CHAPTER II 



THE MAGNETIC CIRCUIT ELECTROMAGNETS 

 ART. PAOB 



1. The magnetic circuit 10 



2. Definitions 12 



3. Effect of iron in the magnetic circuit 15 



4. Magnetic circuits in parallel 18 



5. Calculation of leakage paths 22 



6. Flux leakage in similar designs 27 



7. Leakage coefficient 28 



8. Tractive force 29 



9. Materials Wire and insulation 32 



10. Calculation of magnet windings 41 



11. Heat dissipation Temperature rise 44 



12. Intermittent heating 46 



CHAPTER III 

 THE DESIGN OP ELECTROMAGNETS 



13. Introductory 48 



14. Short stroke tractive magnet 49 



15. Magnetic clutch 50 



16. Horseshoe lifting magnet (Numerical example) 



17. Circular lifting magnet (Numerical example) 64 



CONTINUOUS CURRENT GENERATORS 

 CHAPTER IV 



DYNAMO DESIGN FUNDAMENTAL CONSIDERATIONS BRIEF OUTLINB or 



PROBLEM 



18. Generation of e.m.f. ... ............... 



19. The output formula .................. 



20. Number of polesPole pitch Frequency ........... 



ix 



