JNTUK R20 B Tech EEE 2-1 DC Machines and Transformers Material/ Notes PDF Download

JNTUK R20 B Tech EEE 2-1 DC Machines and Transformers Material/ Notes PDF Download: This study material aims to explain the construction, operation principles, and performance evaluation of DC machines. It covers topics such as understanding the characteristics, performance, various speed control methods, and testing techniques of DC motors. Additionally, the material provides insights into predicting the performance of single-phase transformers using equivalent circuit models and explores testing methods for single-phase transformers. Moreover, it delves into the analysis of three-phase transformers and strategies for achieving three-phase to two-phase conversion.

JNTUK R20 B Tech 2-1 DCMT Material – Units

Unit 1 Syllabus PDF Download | JNTUK R20 B Tech 2-1 DCMT Material

Principles of Electromechanical Energy Conversion: Electromechanical Energy Conversion and introduction to DC machines Principles of electromechanical energy conversion – singly excited and multi-excited systems calculation of force and torque using the concept of co-energy. Construction and principle of operation of DC machines – EMF equation for generator – Excitation techniques– characteristics of DC shunt generator –applications of DC Generators

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Unit 2 Syllabus PDF Download | JNTUK R20 B Tech 2-1 DCMT Material

Operation of DC motors: Back-emf and torque equations of dc motors – Armature reaction and commutation – characteristics of separately-excited, shunt, series and compound motors – losses and efficiency – applications of dc motors. Necessity of a starter – starting by 3 point and 4-point starters.

Unit 3 Syllabus PDF Download | JNTUK R20 B Tech 2-1 DCMT Material

Speed Control of motors and Testing of DC Machines Speed control by armature voltage and field control – testing of DC machines – brake test, Swinburne’s method – principle of regenerative or Hopkinson’s method – retardation test – field’s test- separation of losses.

Single-phase Transformers: Types and constructional details – principle of operation –EMF equation – operation on no load and on load – lagging, leading and unity power factors loads –phasor diagrams of transformers – equivalent circuit.

Unit 4 Syllabus PDF Download | JNTUK R20 B Tech 2-1 DCMT Material

Performance and testing of transformers and autotransformers: Regulation – losses and efficiency – effect of variation of frequency and supply voltage on losses – all-day efficiency. Tests on single phase transformers – open circuit and short circuit tests – Sumpner’s test – separation of losses – parallel operation with equal voltage ratios – auto transformer – equivalent circuit – comparison with two winding transformers.

Unit 5 Syllabus PDF Download | JNTUK R20 B Tech 2-1 DCMT Material

3-Phase Transformer: Polyphase connections- Y/Y, Y/ Δ, Δ/Y, Δ/ Δ and open Δ- third harmonics in phase voltages – three winding transformers- transients in switching –off load and on load tap changersScott connection.

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JNTUK R20 B Tech 2-1 DCMT Material PDF Download – Outcomes

• Grasp the fundamentals of electromechanical energy conversion.
• Address armature reaction challenges and enhance commutation efficiency in DC machines.
• Comprehend the torque generation process and regulate the speed of DC motors.
• Evaluate the operational efficiency of single-phase transformers.
• Calculate the regulation, losses, and efficiency of single-phase transformers in advance.
• Explore parallel transformer configurations, and voltage control via tap changing techniques, and accomplish three-phase to two-phase conversion.