While "Electrical Machines-I" typically introduces students to direct current (DC) machines and transformers, focuses almost exclusively on alternating current (AC) rotating machinery. These machines form the backbone of modern industrial power generation, transmission, and utilization.
: Double revolving field theory and types like split-phase, capacitor-start, and shaded-pole motors.
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The book is structured into sections that align with standard university syllabi, making it a reliable guide for academic exams and professional entrance tests. The paperback versions of textbooks by S
J.B. Gupta’s textbook is widely recognized for its structured pedagogy, extensive analytical derivations, and a vast collection of solved numerical problems. The book is designed to bridge the gap between theoretical electromagnetic principles and practical industrial applications. Core Topics Covered in the Book
Are you studying for a or a competitive test like GATE ? Share public link robust and low maintenance.
Graphical and mathematical analysis showing how changing the rotor excitation affects the armature current and input power factor.
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To highlight the analytical depth found in J.B. Gupta's text, the table below summarizes the key behavioral differences between the two primary classes of AC machines: Induction Machine (Asynchronous) Synchronous Machine Always runs below synchronous speed ( Always runs exactly at synchronous speed ( Starting Torque Self-starting (inherent in 3-phase designs). Not self-starting; requires auxiliary mechanisms. Power Factor Always operates at a lagging power factor. Can operate at lagging, unity, or leading power factors. Excitation Singly excited (AC supplied to stator only). Doubly excited (AC to stator, DC to rotor field). Cost & Complexity Lower initial cost; robust and low maintenance. Higher cost; complex rotor construction with slip rings. A Note on Legal and Academic Access to PDFs
