This book covers the diagnosis and assessment of the various faults which can occur in a three phase induction motor, namely rotor broken-bar faults, rotor-mass unbalance faults, stator winding faults, single phasing faults and crawling. Following a brief introduction, the second chapter describes the construction and operation of an induction motor, then reviews the range of known motor faults, some existing techniques for fault analysis, and some useful signal processing techniques. It includes an extensive literature survey to establish the research trends in induction motor fault analysis. Chapters three to seven describe the assessment of each of the five primary fault types. In the third chapter the rotor broken-bar fault is discussed and then two methods of diagnosis are described; (i) diagnosis of the fault through Radar analysis of stator current Concordia and (ii) diagnosis through envelope analysis of motor startup current using Hilbert and Wavelet Transforms. In chapter four, rotor-mass unbalance faults are assessed, and diagnosis of both transient and steady state stator current has been analyzed using different techniques. If both rotor broken-bar and rotor-mass unbalance faults occur simultaneously then for identification an algorithm is provided in this chapter. Chapter five considers stator winding faults and five different analysis techniques, chapter six covers diagnosis of single phasing faults, and chapter seven describes crawling and its diagnosis. Finally, chapter eight focuses on fault assessment, and presents a summary of the book together with a discussion of prospects for future research on fault diagnosis.
This book covers the diagnosis and assessment of the various faults which can occur in a three phase induction motor, namely rotor broken-bar faults, rotor-mass unbalance faults, stator winding faults, single phasing faults and crawling. Following a brief introduction, the second chapter describes the construction and operation of an induction motor, then reviews the range of known motor faults, some existing techniques for fault analysis, and some useful signal processing techniques. It includes an extensive literature survey to establish the research trends in induction motor fault analysis. Chapters three to seven describe the assessment of each of the five primary fault types. In the third chapter the rotor broken-bar fault is discussed and then two methods of diagnosis are described; (i) diagnosis of the fault through Radar analysis of stator current Concordia and (ii) diagnosis through envelope analysis of motor startup current using Hilbert and Wavelet Transforms. In chapter four, rotor-mass unbalance faults are assessed, and diagnosis of both transient and steady state stator current has been analyzed using different techniques. If both rotor broken-bar and rotor-mass unbalance faults occur simultaneously then for identification an algorithm is provided in this chapter. Chapter five considers stator winding faults and five different analysis techniques, chapter six covers diagnosis of single phasing faults, and chapter seven describes crawling and its diagnosis. Finally, chapter eight focuses on fault assessment, and presents a summary of the book together with a discussion of prospects for future research on fault diagnosis.
In the nineteenth century, Bengal witnessed an extraordinary intellectual flowering. Bengali prose emerged, and with it the novel and modern blank verse; old arguments about religion, society, and the lives of women were overturned; great schools and colleges were created; new ideas surfaced in science. And all these changes were led by a handful of remarkable men and women. For the first time comes a gripping narrative about the Bengal Renaissance recounted through the lives of all its players from Rammohun Roy to Rabindranath Tagore. Immaculately researched, told with colour, drama, and passion, Awakening is a stunning achievement.
Modern food habits, vis-a-vis lifestyle, has started taking its toll in the form of obesity, depression, auto-immune diseases, spondylosis, arthritis, cardiac disorders, insomnia, cancer, diabetes, hypercholesterolemia, osteoporosis and many other ailments. Keeping pace with the demand for lifestyle food, food companies are producing more and more synthetic food or processed food. This is one dimensional food, i.e. food for food's sake. We are on the verge of forgetting that food has other roles to serve in our body, mind and soul too. Food has other dimensions to act, i.e. to serve as medicine as well. The concept of functional food or nutraceuticals, though it sounds new, has its roots in the traditional food habits of great cultures like Indian, Chinese, Mediterranean or Greek, which have survived thousands of years of trials and errors. Hippocrates (c. 460 – c. 370 BC), the great Greek philosopher, had said “Let food be thy medicine and medicine be thy food” Therefore, we should go back to basics and eat only food that possesses drug properties as well. A host of food plants are available around us which have the capacity to alleviate several modern day life-style diseases. The traditional ‘sak’, ‘sabjee’ and whole grain foods are to name a few. The line between drug tablets and nutraceuticals is rapidly becoming narrower. The nutrients in cereals have shown to possess the property of reducing the risk of diabetes, coronary heart dysfunction, tumour incidence, higher blood cholesterol etc. The garlic has immunomodulatory function among other innumerable nutraceuticals. The sages of Rigveda have said, “Plant! Thus I hail thee, the Divine Mother of mankind.” - Rigveda 10.97.4. The authors in this book have tried their best to give glimpses of information about the medicinal plants surrounding us that have dietetic as well as antioxidant properties and tried to answer the moot question of sufferings of modern society.
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