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To drive the PMBLDC motor, for the conventional 120-degree commutation, the winding without phase current in each conduction interval can be considered as a sensor for back-emf detection. However, in the case of 180-degree commutation, the back-emf detection cannot be realized because all the three phases conduct current in each interval and no back-emf signals are available on stator terminals, which is the reason why the 180-degree sensorless commutation has not been considered so far. In this thesis, a novel 180-degree sensorless system for a PMBLDC motor is proposed. The position and...

PREVENTION OF BUILDING AGAINST PROGRESSIVE COLLAPSE: According to the modern scenario, most of the structures follow progressive collapse phenomenon. Even though buildings are designed to resist for all probable loads without any failure of structural member, they fail occasionally due to insufficient and poor design and construction techniques, especially for extreme and abnormal loads. This book deals with the analysis and design of G+3, G+ 5, G+ 7 and G+12 (with 10 different cases) storey buildings in SAP-2000 by performing Non-linear Dynamic Alternative Path Method. The variation of base...