JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Electrical Machines

Course Objectives

to prepare the students to

• design and model AC and DC rotating machines
• Learn electromagnetic energy conversion
• know about rating of machines

Course Outcomes

Students will be able to

• give a systematic approach for design, modeling and analysis of rotating machines
• design and model special machines.

UNIT - I

Principles of Design of Machines -Specific loadings, choice of magnetic and electric loadings,Real and apparent flux densities, temperature rise calculation, Separation of main dimension for DC machines, Induction machines and synchronous machines, Design of Transformers-General considerations, output equation, emf per turn, choice of flux density and current density, main dimensions, leakage reactance and conductor size, design of tank and cooling.

UNIT - II

Specific loadings, choice of magnetic and electric loadings Real and apparent flux -densities, temperature rise calculation,Separation of main dimension for DC machines,Induction machines and synchronous machines,Heating and cooling of machines, types of ventilation, continuous and intermittent rating.

UNIT - III

General considerations, output equation, emf per turn, choice of flux density and current density, main dimensions, leakage reactance and conductor size, design of tank and cooling tubes,Calculation of losses, efficiency and regulation, Forces winding during short circuit.

UNIT - IV

General considerations, output equation, Choice of specific electric and magnetic loadings, efficiency, power factor, Number of slots in stator and rotor,Elimination of harmonic torques.

UNIT - V

Design of stator and rotor winding, slot leakage flux, Leakage reactance, equivalent resistance of squirrel cage rotor, Magnetizing current, efficiency from design data. Types of alternators, comparison, specific loadings, output co-efficient, design of main dimensions Introduction to Computer Aided Electrical Machine Design Energy efficient machines.

TEXT BOOKS:

• 1. Clayton A.E, “The Performance and Design of D.C. Machines”, Sir I. Pitman & sons, Ltd.
• 2. M.G. Say, “The Performance and Design of A.C. Machines “, Pitman

REFERENCES:

• 1. Sawhney A.K, “A course in Electrical Machine Design”, Dhanpat Rai & Sons, 5th Edition R19 M. TECH. EPE/EPS M. TECH. I Year II Sem. (EPE/EPS)