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  1. noisun

    n+1 and n-1 excitation of crankshaft torsional vibrations

    Sorry, I forgot signature...my name is Noisun. Cheers Noisun
  2. noisun

    Single phase electric motor 500Hz noise

    Dear Electricpete, thank you for your thoughts...your first input was the right one (unfortunately)! I tried with an impact test (accelerometer on stator stack, hammer at about the same point, motor still) and a very sharp peak structural resonance at 520 Hz came out. Repeating the same impact...
  3. noisun

    Single phase electric motor 500Hz noise

    Dear GregLocock, thank you for your inputs. I took my time to try what you said. I can't hear 500Hz component noise by myself (I tried, referring my ear to a pure 500Hz sine), because it isn't predominant in the overall sound pressure spectrum...more important are 49 Hz (running speed), 100Hz...
  4. noisun

    Single phase electric motor 500Hz noise

    I'm studying the airborne noise emitted by a single-phase small (less than 100W) electric motor for dishwasher machines. It is a 2 poles motor with capacitor connected to an auxiliary (2 poles) winding very similar to the main winding (capacitor and auxiliary winding are always connected during...

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