hanulec

iTrader: (28)

without a pic... i cannot really envision your layout
im an onroad guy

grifind

well lets say there is no chance the motor electromagnetic- failed the fan... :/

hanulec

iTrader: (28)

I understand that
Electromagnetic issues won't kill a fan

Mounting of a fan in an off-road car is important as the unit cannot be loosely placed in the car. Hard mounting to chassis or motor are generally the best option

grifind

i am aware of that and thats why im banging my head to understand why i got 2/2 fans dead

disaster999

iTrader: (1)

I used to like WTF 30mm fans....but I dont know anymore

imprsme

iTrader: (89)

hanulec

iTrader: (28)

that is a very common issue
the rotor magnet is very strong in the motor. you must make sure the fan is outside of the magnetic field of the motor.
we shim upto 10mm away from the motor.

Nerobro

iTrader: (2)

This is a really amusing thread to read.

So.. in the past, before we had spare watt hours to play with, heatsinks were the rule. anything to cool the motors was done with natural airflow. Bodies, and chassis were designed to move air around the motor.

Speaking of moving air around the motor. There's something I picked up from working on computers.. and dealing with "real cars". Ductwork matters. It doesn't take a whole lot of air to make a HUGE difference in cooled object temperature. Heat transfer is about the difference in temperature. Depending on how muc hheat you're dumping into the airflow, twice as much air doesn't net you twice as much cooling. The relationships involved are also .. i'm going to call them Asymptotic, so the harder you work, you're making less and less of a difference.

I think... "any fan" and good ductwork should be what people are looking for. As opposed to just kicking up huge amounts of turbulant air around their motor. If you can keep the cooling air, moving, an near the case of the motor, or even, if you're clever, get air pressure fed into the cooling holes on the motor, you're going to do a lot better than just a fan mounted near a metal block.

At least a few people at my track have made some halfhearted attempts at ductwork. The TC4, also had a duct available from Team Associated for just that purpose. I think so does the TT02.

disaster999

iTrader: (1)

The thing is, I have tried using another brand of motor fan at the exact same location and did not encounter that issue, even extreme cases where the fan is basically on the motor and still did no have any issue where the magnetic field of the motor could affect the fan to that degree.

To say this is a common issue and brush aside the fact that the fan's specific job is to cool down a motor with strong magnetic field is just lazy. You would think that they would take that into account and add some EMI shield to combat that issue. With how marked up these fans are, they surely could afford it.

Mounting the fan as far back and away from the motor's magnetic field would be ideal, but not every application have that kind of space for it.

JeffPorter

My wtf's break a lot.

WagwanBumba

iTrader: (1)

My WTF fans just die for no reason Stopped using them now.

Vintagedriver

iTrader: (21)

disaster999

iTrader: (1)

TDX 40mm ultra boost,
https://www.facebook.com/TDX-Factory-224772110947622/
TDX NEW generations 40mm ultra boost cooling fan ver. 2

The WTF was is a 30mm fan and the TDX fan is a 40mm, but its the basic construction is the same. Theres not much point to a fan with strong magnets if it is easily affected by the magnetic field of the motor. The TDX easily moves a lot more air than a WTF fan of the same size.

massenb203

Did you do a direct hook up to the battery to see if the fan works. Because depending on which model of the WTF you have. It might not be receiving the proper voltage to work.

bertrandsv87

iTrader: (2)

My wtf fan is pretty noisy, but works.... You'll need to place it far from the motor though.....