{"product_id":"9781394423767","title":"Magnetic Models for Electric Machines","description":"\u003ch1\u003eMagnetic Models for Electric Machines\u003c\/h1\u003e\u003ch3\u003eJeremy Fiennes\u003c\/h3\u003e\u003cdiv\u003e\u003cb\u003eTechnology \u0026amp; Engineering \/ Electrical\u003c\/b\u003e\u003c\/div\u003e\u003cbr\u003e\u003cdiv\u003e\n\u003cp\u003e\u003cb\u003eThe Magnetic Model approach to Electrical Machines\u003c\/b\u003e \u003c\/p\u003e\n\u003cp\u003eIts principal advantages are firstly its \u003ci\u003esimplicity\u003c\/i\u003e. The conventional electrical 'd-q-' model for a salient-pole synchronous machine, for instance, involves 10 electric variables, being 5 coil voltages and 5 coil currents. They are related by a 5x5 inductance matrix. Whereas the magnetic model has only two variables: a complex mmf representing the coil currents, and a complex flux that determines the coil voltages. From these the mechanical torque is obtained.  \u003c\/p\u003e\n\u003cp\u003eThe other main advantage is that since the complex mmf and flux are \u003ci\u003espace vectors\u003c\/i\u003e, they are \u003ci\u003ereadily visualizable\u003c\/i\u003e in physical terms. This is invaluable for beginning students who normally accompany the mathematics without problem, but are often at a loss to grasp what is ”really going on”.  \u003c\/p\u003e\n\u003cp\u003eA sudden short-circuit on a synchronous machine on the electric approach involves inverting the 5x5 inductance matrix, with laborious mathematics. On the magnetic model the results – including all the torque components – can be written down by inspection with no mathematics at all.  \u003c\/p\u003e\n\u003cp\u003eDue to its simplicity, the  magnetic model allows quantitative analysis in cases normally only treated descriptively in texts of this level. The dynamic braking of induction machines; the shaded-pole motor; the asynchronous start of a salient-pole synchronous motor with its half-speed 'kink'; and so on. The inclusion of a rotor eddy-current factor in the conventional induction machine model allows the IEC design class torque\/speed characteristics to be reproduced, otherwise impossible. A novel mathematical technique enables both axes of a salient-pole device to be treated in a single circuit.   \u003c\/p\u003e\n\u003cp\u003eAttention is paid to the practical aspects of design and testing, often neglected in comparable texts. There are ample worked examples – in principle one for each theoretical point – that with different numeral values can serve as a basis for student exercises.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv\u003e  \u003cp\u003e\u003cb\u003eJeremy Fiennes, MSc, \u003c\/b\u003eis a Professor at Federal University of Bahia, Brazil. He earned a First Class Honours in Engineering at Cambridge University, and an MSc at Imperial College, London under Prof. E.R. Laithwaite, the originator of the Magnetic Equivalent idea, and published foundational research on it in the IEE Journal. He has extensive practical experience as an erection and commissioning engineer at Machinenfabrik Oerlikon in Zurich, Switzerland, and later at ASEA in Västerås, Sweden. His further academic appointments include Kingston University, London and the Federal University of Paraiba, Brazil. \u003c\/p\u003e\n\u003c\/div\u003e\u003cbr\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003ePublication Date: \u003c\/td\u003e\n\u003ctd\u003e24 November 2026\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePublisher: \u003c\/td\u003e\n\u003ctd\u003eWiley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImprint: \u003c\/td\u003e\n\u003ctd\u003eWiley-IEEE Press\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eISBN-13: \u003c\/td\u003e\n\u003ctd\u003e9781394423767\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormat: \u003c\/td\u003e\n\u003ctd\u003eHardback\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePage Count: \u003c\/td\u003e\n\u003ctd\u003e544\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Wiley","offers":[{"title":"Default Title","offer_id":50292521828492,"sku":"9781394423767","price":112.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/9545\/1788\/files\/9781394423767_99eddbbd-1dc4-4df4-9673-58d40c9a18e8.jpg?v=1780617071","url":"https:\/\/fh90cf-fv.myshopify.com\/products\/9781394423767","provider":"Late Knight Books and Services, LLC","version":"1.0","type":"link"}