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It is a3-Phase AC motor for driving a heavy duty machine through an already existing gearbox.
1400 Rpm is always overloaded and will no longer run the machine .So it is always choose an engine with more capability,say2900 rpm
It is better to choose an engine with2900rpm and give speed reference (2000/2900) x maximum frequency of the engine (Hz) into the inverter.
If you choose an engine with1400rpm, you must give speed reference (2000/1400) x maximum frequency of the engine (Hz) into the inverter. Its mean increasing working voltage above the engine's ability that causing an overvoltage and the engine will be overheated.
You should go ahead with2900 RPM machine because AC inverters when opeates beyond the base frequency their performance detoriates.
Where as a2900 rpm machine will give you perfect flexibilty to operate at2000 RPM.
its better use2900rpm
Using2900 rpm is the answer
