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  1. ituanra

    fan for wind tunnel

    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?
  2. ituanra

    3phase induction motor vibrating at stator slot passing freq?

    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...
  3. ituanra

    3phase induction motor vibrating at stator slot passing freq?

    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)...
  4. ituanra

    3phase induction motor vibrating at stator slot passing freq?

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

    3phase induction motor vibrating at stator slot passing freq?

    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...

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