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Unit Code: EEB712

Unit Name: Electrical Machines

Description: Electricity does not occur naturally in usable form and it also cannot be stored in usefully large quantities. It must be generated continuously to meet the demand (of power) at all times. An efficient and convenient way to generate electric power is by conversion of mechanical power into electrical form in a rotating device called a generator. The electromagnetic system is an essential element of all rotating electric machinery. All electric motors and generators, ranging in size from fractional horsepower units found in domestic appliances to the gigantic several thousand kW motors employed in heavy industry and several hundred-megawatt generators installed in modern generating stations, depending upon the magnetic field as the coupling medium allowing interchange of energy in either direction between electrical and mechanical systems. The objective, of course, is to introduce you to the basic concepts and working principles of electrical machines and give a deep understanding of the theory of electromechanical devices, with specific emphasis on the theory of rotating electric machines. An electromechanical engineer needs thorough comprehension of the electrical machines: three-phase induction and synchronous machine, single-phase motors, transformers and DC machines. You will learn to use MATLAB? to represent and characterize different machines.

Learning Target Outcomes: 1. Describe the structure and working principles of electric drive systems and their role in various industrial applications. (WA 1) 2. Identify parameters in models of electrical machines, Construct phasor diagrams for different loads and Perform calculations using equivalent circuits to analyze electrical machines in steady state. (WA 2, WA 3) 3. Describe the design of a simple three-phase ac winding, analysis for voltage harmonics & air-gap space harmonics and explain the concepts of pole number and winding factor. (WA 1, WA 4) 4. Understand the two basic principles (generation of force and emf) that govern electromechanical energy conversion and basic requirements placed by mechanical systems on electric drives. (WA 1) 5. Analysis of various speed control of induction motor drives in an energy-efficient manner using power electronics. (WA 4)

Prerequisite: EEB711

Prerequisite Sentence: N/A

Credit Point: 15

Offered In: Semester 2