Author Topic: strange noise and vibration from turbine  (Read 2034 times)

0 Members and 1 Guest are viewing this topic.

jarrod9155

  • Sr. Member
  • ****
  • Posts: 289
strange noise and vibration from turbine
« on: April 13, 2010, 10:07:47 PM »
This is my first turbine so im not sure if this is normal or not but when the turbine seems to have a heavy load on it in high winds the ground around the pole foundation has a vibration and the pole makes a strange groul sound funny saying groul but that best explains the noise . I will say the turbine saw it first real wind and preformed awsome peaking out at 2,000 watts before partial furling in about 25 mph wind gusts . Made 12 kwh in one day on the grid tie inverter. But the noise and vibration was a little worrie some any ideas . ???

cdog

  • Sr. Member
  • ****
  • Posts: 272
Re: strange noise and vibration from turbine
« Reply #1 on: April 13, 2010, 10:24:15 PM »
Mine growls(resonates) down the pipe too, always has.
At first I thought a bad bearing er something, just turns out it is the nature of the beast!
Cdog.

cdog

  • Sr. Member
  • ****
  • Posts: 272
Re: strange noise and vibration from turbine
« Reply #2 on: April 13, 2010, 10:28:40 PM »
Growl is a verry funny and very accurate description too!

DanG

  • Hero Member
  • *****
  • Posts: 1122
  • Country: us
  • 35 miles east of Lake Okeechobee
Re: strange noise and vibration from turbine
« Reply #3 on: April 13, 2010, 10:44:08 PM »
All stators will growl with some dynamic noises, but a 'Bright' pinging resonance when the alternator is conducting can sometimes be reduced by going to a different diode.

Often high current industrial diodes are designed with a soft turn on to extend lifetimes of all involved components so some cheaper diodes flash on all at once and the whole stator ends up ringing (more loudly) from it. (imagine an incandescent bulb that snaps to full brightness to us but really ramps up slowly compared to a photo strobe)

wooferhound

  • SuperHero Member
  • ******
  • Posts: 2288
  • Country: us
  • Huntsville Alabama U.S.A.
    • Woofer Hound Sound & Lighting Rentals
Re: strange noise and vibration from turbine
« Reply #4 on: April 13, 2010, 11:41:15 PM »
Single phase machines growl or hum more than 3 phase machines

jarrod9155

  • Sr. Member
  • ****
  • Posts: 289
Re: strange noise and vibration from turbine
« Reply #5 on: April 14, 2010, 12:28:18 PM »
Thats good to know Its normal

Ungrounded Lightning Rod

  • SuperHero Member
  • ******
  • Posts: 2866
Re: strange noise and vibration from turbine
« Reply #6 on: April 14, 2010, 06:56:03 PM »
All stators will growl with some dynamic noises, but a 'Bright' pinging resonance when the alternator is conducting can sometimes be reduced by going to a different diode.

Often high current industrial diodes are designed with a soft turn on to extend lifetimes of all involved components so some cheaper diodes flash on all at once and the whole stator ends up ringing (more loudly) from it.

Sounds like you're talking about an "avalanche diode", where the current creates additional electron-hole pairs, allowing more current and reducing the voltage drop at high currents.

This increases efficiency by lowering voltage drop and the associated losses.  But as you point out the sudden flip from just turning on at a higher voltage drop to turning full on in avalanche mode makes for an abrupt change in current, corresponding to energy in higher frequencies.  When these get translated into torque by the reaction between the coil currents and the magnets you get to hear them.

Avalanche diodes are cheaper, not because they're crummier, but because there's a lot of 'em made.  B-)