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I'm looking for a some 3m diameter fan capable of providing airspeeds from 50 to 70m/s. Does anyone know who manufactures this kind of machines?

My motor runs at: line freq: 50Hz rpm with load: 880rpm synchronous speed: 1000rpm I regulate speed through voltage regulation under load. I never said otherwise. I think the stator slot passing freq is a fake path. I think I should ask first: - How do I diagnose my motor problem through...

Thanks electricpete for your interest. Here I try to answer your questions. - What does it mean to use "rotor" as an axis for your "3d spectrum"? I've never heard of that. In my y axis I can read the rotor RPM so each horizontal line is a spectrum for a given velocity (from 150rpm to 900rpm)...

...and by the way, this is an external rotor motor. thanks

We've got a fan 3 phase induction motor generating annoying noise at different frequencies as we increase voltage. In a 3D Spectrum with noise power level in dB(A) (colors) against frequency (x axis) and rotor rpm (y axis) we clearly distinguish: a)blade passing frequency and harmonics up to...