S
My question is, if by installing an AC VFD on a centrifugal fan load, I reduce my motor speed,by reducing the frequency. The voltage, amperage, torque, HP & KW all will be reduced. saving energy but sacrificing speed.
If I alter my pulley sizes to increase the speed of the fan. Then install my VFD reducing my frequency & motor speed, my voltage amperage, torque HP & KW all will be reduced. the load speed will also be reduced bringing it back to the desired speed.
Motor with out VFD
25 HP,460 volts, 28.5 amps, 3535 rpm, 18.5 KW, 60 HZ, available torque 37.14 lbft, resistance 16ohms,drive pulley6.5", driven pulley6.5"
Motor with VFD
8.1 hp 270 volts,16 amps,2109 rpm,7.25 KW, 35.15HZ
available torque 20lbft, drive pulley 6.5"driven pulley 3.82"
I thought my resistance would stay the same at 16 ohms.
is their something I'm missing?
Thank you
Steve
If I alter my pulley sizes to increase the speed of the fan. Then install my VFD reducing my frequency & motor speed, my voltage amperage, torque HP & KW all will be reduced. the load speed will also be reduced bringing it back to the desired speed.
Motor with out VFD
25 HP,460 volts, 28.5 amps, 3535 rpm, 18.5 KW, 60 HZ, available torque 37.14 lbft, resistance 16ohms,drive pulley6.5", driven pulley6.5"
Motor with VFD
8.1 hp 270 volts,16 amps,2109 rpm,7.25 KW, 35.15HZ
available torque 20lbft, drive pulley 6.5"driven pulley 3.82"
I thought my resistance would stay the same at 16 ohms.
is their something I'm missing?
Thank you
Steve