what will happen if the field and armature both are made to
rotate in a synchronous machine ?
Answers were Sorted based on User's Feedback
Answer / shailesh tankni
basically the armature is provided with ac supply which
produces rotating magnetic field, and rotor is provided with
dc supply so as to rotate the motor at synchronous speed, so
if the armature which stationary is rotated it will posses
an additional speed to the supply frequency speed of the motor
so the rotor when excited again with dc supply will rotate
at a higher synchronous speed
| Is This Answer Correct ? | 2 Yes | 0 No |
Answer / jessie
The motor turns. If they turn at the same speed, then
torque approaches zero.
| Is This Answer Correct ? | 0 Yes | 0 No |
My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I - is the value of AC fault current. t - is the operating time of disconnecting device in seconds. K – is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.
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