CMR Institute of Technology Department of EEE Jan-May 2014: Electrical Machine Design (10EE63) /Sem6 /Course Instructor: Sanitha Michail

Assignment # 5- Three Phase induction Motor Submission Due: 14.02.2014 Instructions:  ANSWER NEATLY AND LEGIBLY on A4 sheets only and not in sheets torn from a book.  An incomplete assignment is not acceptable for submission.  Once you submit your assignment, you will be expected to answer all the questions there INDEPENDENTLY. You may be asked to answer any question of the assignment in the class.  Leave clear left margin on every sheet.  On the top of your fist sheet, write your Name, Class, Section, Due Date and Date of Submission.  Staple (do not pin or clip) your sheets cleanly on the left hand top corner.

1

Write a short note about the guidelines in the selection of number of slots in 3 phase IM.

2

Determine the main dimensions ,turns per phase ,number of slots ,conductor cross section and slot area of a 250 hp, 3 phase ,50 Hz ,400 V,1410 rpm slip ring induction motor .Assume Bav=0.5 Wb/m2 ,ac =30000 A/m,efficiency =0.9 and power factor =0.9 winding factor =0.955,current density =3.5 A/mm 2 .The slot space factor is 0.4 and the ratio of core length to pole pitch is 1.2 .the machine is delta connected.

3

Write a short note about the factors to be considered while designing the length of air gap in a 3 phase IM.

4

What are the effects of harmonics in 3 phase IM?

CMR Institute of Technology Department of EEE

section and slot area of a 250 hp, 3 phase ,50 Hz ,400 V,1410 rpm slip ring induction ... ratio of core length to pole pitch is 1.2 .the machine is delta connected. 3.

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