This book addresses the vector control of three-phase AC machines, in particular induction motors with squirrel-cage rotors (IM), permanent magnet synchronous motors (PMSM) and doubly-fed induction machines (DFIM), from a practical design and development perspective. The main focus is on the application of IM and PMSM in electrical drive systems, where field-orientated control has been successfully established in practice. It also discusses the use of grid-voltage oriented control of DFIMs in wind power plants. This second, enlarged edition includes new insights into flatness-based nonlinear control of IM, PMSM and DFIM. The book is useful for practitioners as well as development engineers and designers in the area of electrical drives and wind-power technology. It is a valuable resource for researchers and students.

This book addresses the vector control of three-phase AC machines, in particular induction motors with squirrel-cage rotors (IM), permanent magnet synchronous motors (PMSM) and doubly-fed induction machines (DFIM), from a practical design and development perspective. The main focus is on the application of IM and PMSM in electrical drive systems, where field-orientated control has been successfully established in practice. It also discusses the use of grid-voltage oriented control of DFIMs in wind power plants. This second, enlarged edition includes new insights into flatness-based nonlinear control of IM, PMSM and DFIM. The book is useful for practitioners as well as development engineers and designers in the area of electrical drives and wind-power technology. It is a valuable resource for researchers and students.

This monograph covers the area of vector control of three-phase AC machines, in particular induction motors with squirrel-cage rotor (IM), permanent excited synchronous motors (PMSM) and doubly-fed induction machines (DFIM), from the viewpoint of the practical design and development. Main focus is on the application of the IM and the PMSM in electrical drive systems, where the method of the field-orientated control has been successfully established in the practice, and on the use of the grid voltage orientated controlled DFIM in the wind power plants.
After a summary of the basic structure of a field-oriented controlled three-phase AC drive as well as of a grid voltage orientated controlled wind power plant the inverter control by space vector modulation is extensively discussed with the help of many examples to illustrate the practical application. Based on the basic machine equations, the continuous and the discrete machine models of IM, PMSM and DFIM are derived and questions regarding feedback acquisition and the practical implementation of the field-oriented control are highlighted. The design of vectorial two-dimensional current controllers using the discrete models is then discussed in connection with other essential problems like control variable limitation. Several alternative controller configurations are introduced. Further emphasis is given to determining the machine parameters by calculation from name-plate data and automatic offline parameter identification. Questions of energy efficient operation are addressed, particularly relating to efficiency and torque optimal control strategies under consideration of state variable limitations. Control concepts are proposed for the electrical system of wind-power plants with DFIM, an application which has gained wide-spread importance in recent years. The presented control concept is proven practically and can be regarded as pioneering for new developments.

Control applications for AC drives usually feature linear algorithms in spite of the machine itself being characterized by a non-linear process model. Nevertheless, the introduced control structures have led to a relatively mature stage of development in the practice. Control approaches which take into account system nonlinearities from the outset may however fare better in a number of circumstances. Starting from the structural nonlinearity of the machines, the suitable nonlinear models are derived, and in the process nonlinear controllers are designed on the basis of the method of the "exact linearization" which proves to be the most suitable in comparison with other methods like "backstepping-based" or "passivity-based" designs.

While compiling this book, the authors had been dedicated to expose the problems as close as possible oriented on practical and implementation-related requirements. The theoretical background is detailed as much as needed to understand the subjects; numerous equations, figures, diagrams and appendices support the detailed description of the design processes.

A treasury of spellbinding stories that sparkle and glitter with magic. This stunning collection brings together a selection of enchanted tales from all over the world - from North America to Siberia, West Africa, Peru, India, Japan, England and Australia. Get lost in tales of imaginary worlds, enchanted animal, fantastical creatures, wishes and wizards. Retold by storyteller and vocal performer Laura Sampson and with beautifully detailed artwork by Taiwanese duo Quang and Lien. A beautifully illustrated story collection to treasure, Enchanted Tales is the perfect gift to open up a world of magic to readers of all ages.

A lushly illustrated storybook about savouring the miracles of the everyday. There was once a fawn, who thought that the sun was the most beautiful thing he had ever seen. But when the sun set, the little fawn was sad and afraid. "Mother, where does the sun go?" he asked. Follow one little fawn on his quest in search of the sun, in this lushly illustrated tale. A lyrical story that's a joy to read aloud, this nature-inspired fable delivers a gentle warning against losing sight of the important things in life. With deft nods to mindfulness and magical realism, The Fawn Who Chased the Sun is a fable for our times and a modern-classic in the making. This intricately-foiled hardback edition is as beautiful to look at as it is to read aloud, showcasing stunning artwork from award-winning illustration duo Quang and Lien. A book to treasure.

An intricate pop-up book to mark the centenary of Tukankhamun's Tomb's discovery in 1922. 100 years ago, Howard Carter and his team made an incredible find: the undisturbed tomb of an ancient Egyptian pharaoh, buried for more than 3,000 years. Now you too can discover the treasures of Tutankhamun's tomb, in this fascinating book all about ancient Egyptian mummies. Packed with multi-layered pop-ups and flaps to lift, this incredible feat of paper-engineering allows the reader to make their own finds, page after page. From the pyramids and tombs where mummified pharaohs were buried, to the process of making a mummy, you'll soon be an expert on the art of mummification and the amazing rituals involved. Written by internationally-successful author Moira Butterfield of A Trip to the Future, consulted by Stephanie Boonstra of the Egypt Exploration Society, and illustrated by award-winning Vietnamese duo Quang and Lien, this fact-packed pop-up is sure to be a hit with readers 7+.