Design of DC Machines & Transformer - [2160912]


Teaching Scheme

Tutorial Practical Total
3 0 2 5

Examination Scheme

Theory Examination Practical Examination Total
ESE (E) PA (M) ESE Viva (V) PA (I)
- - - - -

    ESE = End Semester Examination, PA = Progressive Assessment

Course Type   

Syllabus Content

Specific electric loading and Specific magnetic loading; Output coefficient; Output equations for transformers and rotating machines; Factors affecting size of machines; Criteria for selection of specific loadings; Heating and Cooling of Transformers and rotating machines.
Types of transformers; Position of HV and LV windings and its importance; Relation between core and yoke cross section area and its significance; Different types of transformer windings; Different positions of taping; Window space factor; Factors affecting window space factor; Relation between emf per turn and transformer rating; Stacking factor.
Design of window dimensions, yoke dimensions and overall core dimensions; Numerical examples.
Design of HVand LV windings (No. of turns and area of cross section); Selection of type of winding.
Primary and secondary winding resistance and Leakage reactance calculation; Calculation of no load current, losses and temperature rise of transformer; Design of tank with tubes; Calculation of dimension of tank; Numerical examples. Variation of output and losses in transformer with linear dimensions; Basic design aspects of dry transformer and high frequency transformers. Basic design aspects of welding transformers and instrument transformers
Introduction; Output equation; MMF calculation; Selection of number of poles; Design of core length and armature diameter; Carter’s fringing curves and its significance; Design of length of air gap; Numerical examples.
Choice of armature winding; Armature conductor; Number of armature slots; Slot dimensions; Slot loading; Design of armature core; Numerical examples.
Pole design; Design of field winding of shunt, series and compound machines; Design of inter poles; Effects and minimization of armature reaction; Design of commutator and brushes; Numerical examples. Performance parameters evaluation.

Reference Books

SrTitleAuthorPublicationAmazon Link
1A course in electrical machine Design     
2Electrical Machine DesignR. K. Agrawal 
3Design of Electrical MachineV. N. Mittle    

Course Outcome

After learning the course the students should be able to:

  • Design the DC machine of given specifications.
  • Design the transformers of given specifications.
  • Prepare the detailed sketches of the designed machines.