help finding replacement for this BLDC fan controller

[administr4tor]

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its for a Radiator Fan for automobile car
OEM part is out of stock

any way I can find a replacement part for it somewhere?

please help

THanks

[Randy222]

Inside that box is likely just a FET with a pull-down resistor. It may also have a zener or diode to squash flyback.

The FET gate may also have a small resistor on it, but the device looks automotive, and many times the ECU control line has the resistor in the ECU.

The ENABLE line can just be an SSR, so it provides power to the ckt, but the FET swicthes the motor on/off to the beat of BLUE PWM.

The wire-gram on unit shows 6 connections, but the 3 connectors have 8 ??

Making the device should be very easy.

[Uunoctium]

Comex is still alive and produces three different types of fan controllers. You may write them an email and ask, if one of the types is suitable as an replacement for your damaged one. (probably only with some modifications eg replacing the NTC with an fixed resistor).

https://www.comex-europe.com/cms/en871-electronic-speed-control.asp

[thm_w]

ebay: https://www.ebay.ca/itm/314431717115
auto wrecker

Is it the same as this one? https://fortnine.ca/en/triumph-fan-pwm-controller-t2507700

[Randy222]

That one from CA site, $327(CAN) !!
Yikes, can build probably a dozen of them from discrete parts for that price.

Buying a cots is always easier, but I do evaluate DIY.

[amyk]

My guess is the inside has not much more than a relay and two FETs, and maybe a few passives.

"Don't turn it on, take it apart!"

[administr4tor]

yeah, thats one of the reason I am trying to find alternate, why pay $350 when you get it cheaper elsewhere?


I found this, do you think it will work? the Audi one is rated for 60A, while Triumph one is rated 20A (?) atleast thats the fuse I see in Triumph diagram.


https://www.amazon.com/-/fr/No-8E0959501AG-8E0959501AB-8E0959501K-ventilateur-refroidissement/dp/B0CHS8X9QW



below is PIN out and OEM Audi Electrical diagram for the Audi cooling fan PWM module






if you think it will work, what pins replace what pins , i need conversion of pins between amazon and triumph module, based on information above.

Thanks for helping me out

My guess is the inside has not much more than a relay and two FETs, and maybe a few passives.

"Don't turn it on, take it apart!"

That one from CA site, $327(CAN) !!
Yikes, can build probably a dozen of them from discrete parts for that price.

Buying a cots is always easier, but I do evaluate DIY.

ebay: https://www.ebay.ca/itm/314431717115
auto wrecker

Is it the same as this one? https://fortnine.ca/en/triumph-fan-pwm-controller-t2507700

Comex is still alive and produces three different types of fan controllers. You may write them an email and ask, if one of the types is suitable as an replacement for your damaged one. (probably only with some modifications eg replacing the NTC with an fixed resistor).

https://www.comex-europe.com/cms/en871-electronic-speed-control.asp

[administr4tor]

:bump:

[Randy222]

I found this, do you think it will work? the Audi one is rated for 60A, while Triumph one is rated 20A (?) atleast thats the fuse I see in Triumph diagram.


https://www.amazon.com/-/fr/No-8E0959501AG-8E0959501AB-8E0959501K-ventilateur-refroidissement/dp/B0CHS8X9QW

Is the plug a direct fit? I can say with 100% certainty, it may or may not work.

The original side label only shows one (M) motor, so probably the two "white" connectors for fans are wired in parallel. It is very likely to be a current sink controller. Two nFET's in series, yellow gates one, the blue PWM turns on/off the 2nd FET. Yellow (ignition) so that the fans cant stay running after the key has gone to off.

Probably just easier to build a replacement.
IRF low Rds very high amps, decent 40v, use diode to quench flyback
IRFB7434PBF

1k pull-down on gates.

Plenty of helpers around on this site to drum up schematic as needed.

[Smokey]

BLDC = brushless DC electric motor
https://en.wikipedia.org/wiki/Brushless_DC_electric_motor

[administr4tor]

how do I make my own?

[Randy222]

how do I make my own?

Start a thread in the Projects forum.
"Need Schematic For DIY Controller"

It's very simple to make.

[aeg]

I think the mechanical and thermal aspects are the hard part...

[Randy222]

I think the mechanical and thermal aspects are the hard part...

What mechanical aspects?

Some discrete components potted. Should be no issue for automotive use.

Something like this she-matic.

[administr4tor]

I can build this one, I just ordered parts but I am just wondering about the logic, if there is any? how do I find that out?

Thanks Randy

[Randy222]

There's some input feedback missing as that is likely a temp sensor (or two) somewhere else.

But looking at it with IGN and two fans, along with my knowledge with Toyota vehicle old and new and how they do electrical logic on some things, I only suspect what I gave as being suspect control. The IGN there (yellow) would seem to be a failsafe input. When you turn on IGN does that wire got to 12v?

The module sticker helps, "yellow enable", "Blue PWM". Indicates what I had described. Yellow being a full shutoff of fans after the IGN goes to off position.

To test the Blue PWM I suspect the temp sensor needs to get hot enough to bring PWM above 0%, so the only way to test that is using a handheld scope on Blue wire while the engine starts to warm up. You could hardware a manual switch to the fans just so when it starts to warm up you can flip on the fans to prevent the overheat, then shut it down and let fans run for about a minute.

And everything after 12v in my schematic is fused somewhere. The IGN Yellow and Red+ should already be fused, but nothing stopping you from adding additional inline fuses, maybe a 0.5 or 1A for Yellow, and a 50A for Red+ (not sure what load the fans are, etc).

Just go slow and do testing where you can.