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Doubly-fed electric machines also slip-ring generators are electric motors or electric generators, where both the field magnet windings and armature windings are separately connected to equipment outside the machine.
By feeding adjustable frequency AC power to the field windings, the magnetic field can be made to rotate, allowing variation in motor or generator speed. This is useful, for instance, for generators used in wind turbines. DFIG-based wind turbines, because of their flexibility and ability to control active and reactive power, are almost the most interesting wind turbine technology.

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  1. Bengie

    Fed up with the junk on here

    This has to be the most cluttered forum or website I have ever visited, why does the "PlumbersForums.net asks for your consent to use your personal data to:" have to pop up every time you click on something, surely once at sign in is enough. It is so hard to navigate around this site.
  2. trickyguns

    Ideal Vulcan SX / DLX gravity fed boiler - No hot water

    HI everyone, I went to look at a prehistoric gravity fed Ideal Vulcan SX / DLX boiler with reports of no heating or hot water. This is a 4 pipe 28mm pump fed heating and gravity fed water pipes to water cylinder. I found that the heating pump had stopped spinning and found sludge behind the...
  3. R

    Rural Gravity Fed Pipe In River Setup, Any advice appreciated,

    Hey to all in the community, im not a plumber so any advice would be greatly appreciated. I reside in rural ireland and we currently get our mains water fed to us from a pipe which is one 1km long from a stream out the back of our property. It is then filtered with rocksalt, uv, Reverse...
    • RuralDonegal
    • Thread
    • advice america appreciated fed gravity pipe setup usa
    • Replies: 0
    • Forum: USA
  4. T

    Mixer Shower and Gravity Fed System

    About 10 years ago we had a new mixer shower fitted. However, the most we ever got out of it was a trickle - even from the beginning. At the time I looked up the manufacturers installation instructions and it says that the showerhead needs to be at least 1 m from the bottom of the water tank we...
    • Toobrish
    • Thread
    • america fed gravity gravity fed system mixer mixer shower shower system urgent usa
    • Replies: 8
    • Forum: USA
  5. J

    wall fed shower head change to 1/2 bs fitting

    we have mira excel bir shower and the shower head is not looking good all the chrome is coming of and we want to replace it. we canot get a replacement as they do not sell the logic bir head anymore it is only available with the full shower? we had bought a difrent shower head but when fitting...
    • jimyjamas
    • Thread
    • america change fed fitting head shower shower head usa wall
    • Replies: 0
    • Forum: USA
  6. S

    Mira digital shower with gravity fed hot water system.

    Hi, I’ve been to quote for an en-suite for a customer and they like the idea of these digital showers . I’ve not fitted many of these digital showers and when I have it’s only been on unvented systems. Was wondering is the pressure and flow good on the digital showers ? I know you can get...
    • shyguy2005
    • Thread
    • america digital fed gravity hot hot water hot water system mira pump shower shower pump system usa water
    • Replies: 3
    • Forum: USA
  7. H

    Converting gravity fed to pumped system

    have an old system, large water tank and small f&e tank on loft, hot water cylinder on first floor, boilder on ground floor (Ideal Mexico Super C 125, vintage 1987, works well though had new stat put in recently). Would really like to just change HWC and leave everything else in place, though...
    • helon
    • Thread
    • america fed fully pumped gravity gravity fed system hot water cylinder pumped system usa
    • Replies: 4
    • Forum: USA
  8. P

    Cold Towel Rail Fed By Robbens UFH System

    Hi All, Hoping someone can help with what I thought was a minor problem/easy fix issue with the towel rail in my new-ish house; it is now permanently cold. I'll explain a bit of background, the system set up and some things I've tried so far... Hopefully I'm missing something blindly obvious...
  9. C

    Advice on converting from Gravity Fed to Fully Pumped.

    OK, time served aerospace engineer here. Here's my query. Mums house has a very old floor standing boiler - HW is gravity fed, CH is pumped. F/E is in the return pipe of the HW loop. I live a long way away, so have to deal with it remotely, otherwise i'd be doing it myself. Boiler has been...
    • Captainbeaky
    • Thread
    • advice fed fully fully pumped gravity pumped
    • Replies: 5
    • Forum: Canada
  10. D

    want to fit tmv2 but supples to basin taps not balanced pressures

    have gravity hot, mains cold to basin taps,require to fit a tmv2 anything i can fit to avoid trying to get gravity cold to taps to balance
    • drainrod
    • Thread
    • balanced basin cold cold water fed gravity hot water mains pressures safe taps water
    • Replies: 6
    • Forum: Australia
  11. S

    Problems with hot water on a gravity fed system.

    Asking for a neighbour. He has an old style gravity fed heating system with tank and immersion heater. He has just changed the pump and three way valve actuator. His heating works but if he selects hot water it turns the heating off. Any suggestions would be appreciated, thank you.
  12. S

    Best Pump for gravity fed shower shower?

    Hi - I have bought a Grohe thermostatic shower to fit to my main bathroom. I have a gravity fed heating system, therefore I'm looking for a pump to give me decent pressure to the shower. I really like it to be powerful, therefore what would you suggest? I have been looking at this...
  13. S

    Drop fed rads - draining from rad tail.

    Im planning to drain down my CH system to do some work on it and also replace a couple of rads. All of the downstairs rads are on individual drop feeds with most of the pipe work on 10mm microbore ( a few have had 15mm adapters and 15mm pipe added) There are no drain cocks on any of the rads...
  14. C

    Hive to replace Drayton LP722 on Gravity Fed System

    Hi all, I am planning on replacing my Drayton LP722 Programmer for a Hive programmer.( THIS HIVE?? : https://www.amazon.co.uk/d/Home-Kitchen/Hive-Heating-Thermostat-Professional-Installation/B011B3J6B8/ref=sr_1_2?ie=UTF8&qid=1547395207&sr=8-2&keywords=hive%2Bheating%2Bhot%2Bwater&th=1 ) The...
  15. T

    Unvented santon (45 yr old?) immersion heater with gravity fed tank?

    Hello, I hope someone can help, we recently were forced to move to a ground floor social housing flat because of my partners worsening health condition. It has an assisted shower with a mira advanced thermostatic low-pressure shower unit so hot water for baths isn't a problem. However, the...
  16. A

    Full Pumped or Gravity Fed / Part Pumped system ?

    I am installing Hive Active heating and need to know if my system is fully pumped or Gravity Fed / Part Pumped. I have a small tank in the loft to feed water so assume this is open vented. I also have a Grundfos pump attached to the pipework. I also have a megaflow tank. Appreciate your help !
  17. Jock Spanners

    Water filter for spring fed home

    Evening all, I've been asked to fit a whole house filter for a customer whose house is spring fed. I'm thinking of a UV filter plus a three cartridge system but I've not done one before. Can anyone tell me the best way to do it? Thanks, Jock
  18. S

    Hot water to hot on gravity fed

    Hi guys wonder if someone could help. Hot water on a gravity fed system (y plan) is far too hot. Tried swapping cylinder stat but is the same. With hot water on the boiler fires up even when cylinder stat is set at 50c. If I turn the stat down lower the pump and boiler go off. Customer has...
  19. W

    A Fluidmaster fill valve works well on gravity fed?

    The standard ones bundled in a pack with the flush valve from the sheds/screwstation/toolfix don't perform well on gravity fed in my experience. I've heard one of the 'pro' version has a restrictor you can remove to make it work better? If so :- 1) Which valve is this? 2) Does it perform well...
  20. E

    Gravity fed to combi ring?

    hi. Am redoing a bathroom, taken out an old airing cupboard. When people installed the new combi (15ish years ago) they put a ring in, see pics. I am guessing there was no access to bury it or take it out. I would like to know, why they put it in. Obviously it’s got an air vent but I now have...
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