I need to supply 90 kW power and 3650 rpm for running a pump. The highest available electric motor would be 2950 rpm. I have to use a variable frequency drive (VFD)-motor system for raising the speed. What would be the power of 2950 rpm-VFD drive to yield 3650 rpm 90 kW output for the pump?
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Re: What would be the power of 2950 rpm-VFD drive to yield 3650 rpm 90 kW output?
2 October 2009 at 1:29pmA squirrel cage induction motor operating from a VFD is considered to be constant torque below the base speed (2950 rpm) and constant kW above the base speed.
One other caution, which you seem to already be aware of, is the influence of affinity laws on speed when applying variable torque loads such as pumps or blowers. As long as the pump requires 90 kW at 3550 rpm, a 90 kW is sufficient for the task.
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