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.
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.
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 ...
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