Mathcad - 07-06 - Solving for rated torque T rated 5252 P...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Problem 7-6: Solution P rated 500 = hp n rated 1750 = rev min When started at reduced voltage the coils receive the phase voltage instead of the line voltage. Thus, they get 1 over the sq. root of 3 times the line voltage. Torque is proportional to voltage squared, so the starting torque will be 1/3 rd of what it would be at full voltage. from table 7-5, the motor will produce at least 80% of rated torque with a full voltage start
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Solving for rated torque T rated 5252 P rated n rated lb ft = T rated 1.501 10 3 lb ft = thus at full voltage: T LR_FV 0.8 T rated = T LR_FV 1.2 10 3 lb ft = at the reduced voltage of the Y-delta starter the motor should produce one third or 400 lb ft...
View Full Document

This note was uploaded on 03/26/2012 for the course ECET 231 taught by Professor Piller during the Spring '12 term at Purdue University-West Lafayette.

Ask a homework question - tutors are online