Electronics > Projects, Designs, and Technical Stuff
Slowing down a pedestal fan
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TomS_:

--- Quote from: Psi on April 28, 2020, 08:29:35 am ---One word of warning, if you drop the voltage too low the lowest speed setting may not have enough torque to start spinning the blades.
They may stall and the fan just sit there humming,  this is bad and may cause the motor to overheat
So keep that in mind.  Fan on but not moving = bad. <Insert usual disclaimer about not burning down ones house>

--- End quote ---

Yeah this is pretty close to what I was seeing, so I turned it off pretty quickly. It was barely able to get started and was only turning very very slowly. I dont feel like burning my parents house down (as happened a couple of weeks ago just one street away), especially since my dad has a habbit of falling asleep on the couch while watching TV and could sleep through a world war.  ^-^

Need to find another solution, but I suspect at this stage it'll be waiting until I am back here next time, whenever that happens to be given the whole coronavirus mess. My dad doesnt seem so bothered by it, so it was more of a "for me" thing anyway.
Electro Detective:

--- Quote from: Prehistoricman on April 29, 2020, 12:21:30 pm ---
--- Quote from: Electro Detective on April 29, 2020, 01:32:46 am ---
This is on top of the fact they are not isolation transformers and dangerous to begin with, especially in a flipped Active/Neutral mains scenario


--- End quote ---

Why is this dangerous? Appliances should use earth for the chassis and not neutral so I don't see why this could be an issue.


--- End quote ---

You'll understand it one day when it bites you or someone you know, playing with earthed metal chassis stepdown transformer/auto transformer equipment that's not isolated,
and one has a wiring mix up or flip, or a DUT has. Please don't be that guy to find out the hard way!  :scared:

If they are all wired correctly and confirmed as such, what you typed above works fine  :-+

But that's not how things go in the real world, and many people get 'earthed' permanently
because of wiring assumptions, random wiring flips, neglected faults, and cheapskate DIY ignorance


Zero999:
Try a fluorescent tube ballast in series.
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