How to reverse the rotation of DC brushless fan motor from PC
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- čas přidán 4. 07. 2024
- A look inside and an attempt (successful! yay!) to hack/reverse the rotation of a fan motor from old PC power supply. Turned out to be a very simple operation n- all that is needed is to swap two connections. This was easily achieved with a knife and a piece of wire.
- Věda a technologie
Thanks for the info and the video man, very helpful.
You can take out just the PCB by holding the coil part in a vise, and carefully turning the base which contains the bearings. If you were careful during disassembly, the fan will function properly after reassembly.
Very interesting! Just what I needed to see, Thank You
wow nice logical operation ...you are the man...two thumbs for you
Needs this for front wheels of RC car project.
Challenging to get access to PC board as I need both surfaces for gluing.
Could a switch be added so you could make the airflow forward or reverse?
You need some Snap ring pliers. The ones that come with multiple tips of different size and angle, reversible handles instead of the pin and spring kind the ones that just fold to change from inward force to outwards.
Would this also work on a PWM case fan? I would imagine so since PWM is just a means of applying full power at short intervals, but maybe there is a difference? I really want to reverse the direction of some PWM fans but this seems to be the best method I have found so far (aside from cutting up the housing).
yeah same to you, the video is great but for noob like me is quite hard, if there any easy solution to make it reverse the rotation plz tel me
Ĉool, I actually am looking for a micro bldc pc fan motor to power my portabe cassetteplayer project. I'm curious if I can get enough torque with gear ratio to turn the tape. It's pretty silent.
+Synthusiast all depends on gear ratio. Since those spin quite fast, you could reduce through gears the speed and thus increase the torque. It could work. Good luck!
This is a sleeve bearing fan, right?
Instructive !
Hi. and thank you.
Why didn't you just flip the fan blade 🤔🤭... Lol funny thought, Love the channel learn a lot!
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Many of these DC fans have reverse protection. Direct exchange of coil input polarity is a good practice.
Why you did not mounted the fan on the oppposite side to have a reverse air flow?
This was just for fun, to see if it can be done.
bcs he dint have any use of reverse air flow
Has your brain improved in two years?
does the bearing type matter I wanted to do this on some corsair AF series fans with hydraulic bearings thanks and great vid
roynorw hi, bearing should not matter, I only discussed the electronic part of the object. Please expect the circuitry to be different in some modern fans, but coil swap will work exactly the same.
randomtronic thanks bro ill do a vid just in case it goes wrong you can tell me why if possible thanks
roynorw cool. good luck :)
Great!
i have intel cpu stock fan and i discovered that the fan blades are kinda touching the heatsink when the case on its side.. i think the rotor is kinda loose. its making a rattling noise when pc powered on, it doesn't go until i tilt my case 30 degrees.. any fix?
Do i can change the pcb of a 4 pin fan pwm 80mm into a 3 pin fan dc 90mm?
hi there, I want to know why transistors are used in pc fans. and i want to know suitable transistors to replace my burnt transistors.on the burnt transistor there some identification number that is "IC33725 P H 2 4". i checked on the Internet but i got nothing .Can you help me?
Hi, pc fans are brushless DC motors, and require switching between different windings of the stator to happen in sync with the rotation of the fan. That's what transistors (more likely dedicated ICs in a transistor package, often consisting of hall effect sensor and switching logic) do. Those generally are purpose made (to drive cost down) for manufacturers of the fans, and those parts ale very unlikely to be available to buy as a replacement.
@@randomtronic thank you
@@randomtronic WHAT NUMBER OF 2 TRANSISTOR
How to make that system? Wite 2 transistor
Having been able to make it go in the reverse direction, did that do anything to the airflow direction and/or airflow volume ?
+Wah Ng it will reverse the airflow, but it is far less efficient that way due to shape of the blades. For good efficiency you need blades shaped like a mirror image. e.g. drones have 2 left rotating and 2 right rotating rotors. They look like mirror image.
Sounds like the setup the fan manufacturers have on their "counter-rotating" fan models. These models have two fans attached to each other where the front one is rotating its blades in the counter-clockwise direction while the rear one is this rotating its blades in the clockwise direction. The blades on the front fan are a mirror image of the rear fan in these assemblies which increases the airflow more than if you put two singular fans back to back.
+Wah Ng yep, exactly ;)
how to boost up the speed of that cooling fan?
This motor I can use quadcopter...?
+emranhossain tonmou thats what I wanted to try. After some tests, it turned out, that the motor is too weak. After attaching propeller, the motor is unable to spin it fast enough to generate usable lift. If you had 4 of those on a frame, it would fly. But if you add a battery to the frame and some more electronics, then it will stay grounded. Need more power :)
randomtronic so what I do now
In one word.
Wtfish😂
I have a lot of copper, from dc motors and transformers like in power supplys so I can upgrade my dc brushless motor to make it spins powerful I have a 70mm 12v dc 0.40amps just to weak
I like it.
What if we want to change the direction of rotation alternatively. probably adding a small electronic circuit would be great. has any one did that?
where we can buy a cpu fan
easiest option would be ebay/amazon :) if not possible then visit your local pc shop or repair shop.
get it in your computer
can you make video how to create motor for pc fan ?
I want to upgrade some of my dc brushless fans to spin powerful air.
overvolt them to 15 volt
nothing more or the caps will pop off
How to fix graphic card fan i need 3000 rpm speed 😟😟😟
Get a real job.
İf you reverse magnet, will work?
It would I think, but have not tried it - the magnet is glued in the metal cup.
I just tried that.. no luck, it spins in the same direction.
NO. suppose there is NSNS magnet if u reverse it it will be NSNS only, to reverse u must choose which coil u r energising first.
that way you just shifting the magnet against the blade by around 30 degrees depend on how many magnets in there. but reversing the electromagnet or coil might work because it will shift against the sensor.
you must post the hacked electronic circuit of the fan
juanfrancisco I thought I showed clearly what I did there. I did not reverse engineer entire driver circuit unfortunately, so can't post the schematic :( besides, there are as many circuits for fans as there are fan manufacturers - but if you want to do what I did there, that should work with every circuit out there. Thanks
but the spin is so weird , I think you made something wrong
Spin was fine, I just tested it with very low voltage so it spins slower and shows on camera ;)
randomtronic as it have two coils , I believed that there is some sort circuit at the base of the capacitors transistor and for reverse spin L2 must star first
@@randomtronic I only saw you cut one trace and put in one link. I don't see how that would reverse anything. You would really need to cut two traces and put in two links, methinks. I can't be sure without seeing the schematic.
EDIT: I just reviewed the video and see that in fact TWO traces were cut but only the first cut was filmed, the 2nd cut performed off camera.. Also TWO links were installed but one of them was simply a solder bridge. So my comment was pointless. The two cuts and links do in fact reverse the coil polarities.
Ah man I wish I seen this before I glued my kelly doll on the fan on my tesla coil..too late 😧
The DUHHH way to reverse a little box fan is TURN IT AROUND....
Doug Chaney lol :)
But what if it's RGB ;)
clever :)
REMOVE DIODE AT RED WIRE AND YOU GOT IT
no its not like that....i did this but unfortunately i burnt my fan by removing diode.
electronics doesn't work that way, lol.
How to repair sensor
How about just flipping the fan?
Lol, where is the fan in that?
There are typically screw holes on one side, flipping it around made it near impossible to screw it back in, since there is no indentation in the flipside, unless you have access to longer screws.
When its reverse does it sucks air?
Go back to school and then get back to us.
Can I put this on a tattoo gun?
!!!this is not the Right way
!!!!!!!!!!!!!!!!
+drag0n4122 it was intended to be the left way ;)
Jaja gòod one.... would you like to see some tutorials i do?
Sure, pm me.