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The frequencies of VFD observed for above three cases are 20Hz, 40Hz and 60Hz respectively. As well as the exhaust fan m
Posted: Tue Jun 07, 2022 10:24 am
by answerhappygod
- The Frequencies Of Vfd Observed For Above Three Cases Are 20hz 40hz And 60hz Respectively As Well As The Exhaust Fan M 1 (69.31 KiB) Viewed 18 times
The frequencies of VFD observed for above three cases are 20Hz, 40Hz and 60Hz respectively. As well as the exhaust fan motor specifications are also given as: 30 AC induction motor, 380V, 1800-rpm, 60Hz four pole Y-connected, 0.25HP, cosO=0.8, Rs 0.660, Rr=0.38, Xs-1.140, Xr-1.712 and Xm-33.20. www a) Compare the speed of exhaust fan motor for all three mentioned cases. b) Identify voltage for rated frequency in order to maintain the constant volts/hertz ratio throughout the 0 - 60 Hz range. c) Analyze all power conversion stages involved in variable frequency drive operation. d) Plot the waveforms for output line voltages EAB, EAC and EBC. e) Examine full load AMPs when exhaust fan operating at maximum speed. f) Plot the waveforms of output current and PWM pattern for 20Hz, 40Hz and 60Hz respectively.