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Answer Posted / p.subash chandrabose
VFD- VARIABLE FREQUENCY DRIVE
VFD can be used as Variable speed operation
VARIABLE SPEED ACHIVED BY AC MOTOR IN 2 STEPS
1. VARY THE FREQUENCY
2. VARY THE POLE
THE FORMULA WAS N=120F/P
Eg:N=120*50 /4
N=1500 RPM
WE CANOT CHANGE THE POLE EASSY
BUT WE CAN CHANGE THE FREQUENCY ACHIVE BY VFD.
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