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AC Fan motor speed control ideas

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    #21
    Re: AC Fan motor speed control ideas

    Can you reverse the fan blade?
    Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.

    My computer doubles as a space heater.

    Permanently Retired Systems:
    RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
    Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.


    Kooky and Kool Systems
    - 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
    - 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
    - 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
    - Main Workstation - Fully operational!

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      #22
      Re: AC Fan motor speed control ideas

      Originally posted by TechGeek View Post
      Can you reverse the fan blade?
      No. Most likely the blade is going to have only one shaft insert on one side, unless I get really lucky and the hole indeed goes from one side to the other, which I've rarely seen.
      Wattevah...

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        #23
        Re: AC Fan motor speed control ideas

        I do not know if this will work or not but give it a try
        9 PC LCD Monitor
        6 LCD Flat Screen TV
        30 Desk Top Switching Power Supply
        10 Battery Charger Switching Power Supply for Power Tool
        6 18v Lithium Battery Power Boards for Tool Battery Packs
        1 XBox 360 Switching Power Supply and M Board
        25 Servo Drives 220/460 3 Phase
        6 De-soldering Station Switching Power Supply 1 Power Supply
        1 Dell Mother Board
        15 Computer Power Supply
        1 HP Printer Supply & Control Board * lighting finished it *


        These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

        1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
        2 Hem Saw Computer Stack Board

        All of these had CAPs POOF
        All of the mosfet that are taken out by bad caps

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          #24
          Re: AC Fan motor speed control ideas

          If it's a shaded-pole motor, you can flip the stator or the rotor, to reverse direction: https://woodgears.ca/reader/walters/reverse_motor.html

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            #25
            Re: AC Fan motor speed control ideas

            Originally posted by redwire View Post
            If it's a shaded-pole motor, you can flip the stator or the rotor, to reverse direction: https://woodgears.ca/reader/walters/reverse_motor.html
            No, it's most likely similar to the one shown in post #16, hence why I think all I have to do is flip the rotor around. A shaded pole motor would be too big to fit in a fan like this.
            Wattevah...

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              #26
              Re: AC Fan motor speed control ideas

              How about a picture of the motor?

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                #27
                Re: AC Fan motor speed control ideas

                Originally posted by redwire View Post
                How about a picture of the motor?
                I don't have one of my exact fan, but when I pulled out its impeller because it seemed a bit wobbly and I tried balancing it a bit better, I had a look behind it and I can confirm it looks just like the one in post #16.
                Wattevah...

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                  #28
                  Re: AC Fan motor speed control ideas

                  Originally posted by Dannyx View Post
                  I don't have one of my exact fan, but when I pulled out its impeller because it seemed a bit wobbly and I tried balancing it a bit better, I had a look behind it and I can confirm it looks just like the one in post #16.
                  Okay, then remove the two screws holding the bearing retainers and reassemble with the stator flipped.
                  The leads will exit opposite their usual place, check for mechanical interference.

                  It's most certainly a shaded pole motor.
                  When you have it apart, you'll see the heavy copper shunt bars, which is what makes them self-starting without multiple windings & a run cap or centrifugal switch.
                  Woodgears just shows a larger, C-frame one (that powers a gearbox).

                  Incidentally, those shading shunts are what limit these motors to some awful efficiency, something on the order of 30 percent.
                  They then exist, after the motor's at speed, as shorted turns!
                  "pokemon go... to hell!"

                  EOL it...
                  Originally posted by shango066
                  All style and no substance.
                  Originally posted by smashstuff30
                  guilty,guilty,guilty,guilty!
                  guilty of being cheap-made!

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