REVERSE fan spin direction

[H0R53]

I've got a nice looking fan that I want to put on my Cooler Master d92. Only problem is that it spins the right way, but it'll be ugly if I put it on 'the right way'. So I want to flip it and make it spin the other way.

 

Swapping the power and ground don't seem to do anything. It doesn't power on.

 

How can I pull this off without rewiring the motor? Tbh I can do it but it's a pain in the ass and time consuming.

[W-L]

2 minutes ago, H0R53 said:

I've got a nice looking fan that I want to put on my Cooler Master d92. Only problem is that it spins the right way, but it'll be ugly if I put it on 'the right way'. So I want to flip it and make it spin the other way.

 

Swapping the power and ground don't seem to do anything. It doesn't power on.

 

How can I pull this off without rewiring the motor? Tbh I can do it but it's a pain in the ass and time consuming.

The usually have polarity protection with a diode to prevent that from occurring, since spinning a fan backwards yields very little performance due to the shape of the blades being directional. 

[H0R53]

Just now, W-L said:

The usually have polarity protection with a diode to prevent that from occurring, since spinning a fan backwards yields very little performance due to the shape of the blades being direction. 

So short the diode?

[W-L]

Just now, H0R53 said:

So short the diode?

You can get to the PCB and try, just remember it will be more aesthetic than useful at that point. 

[H0R53]

Just now, W-L said:

You can get to the PCB and try, just remember it will be more aesthetic than useful at that point. 

That's more of the point.

[Kobathor]

2 hours ago, H0R53 said:

That's more of the point.

As in practically useless.

[H0R53]

Just now, Kobathor said:

As in practically useless.

There are three components on the board I can get to without taking the whole thing apart. One is labeled IC2, ZD2 and ZD3. There's an R2 underneath the motor that I can't reach without removing the motor. Any of these?

[Kobathor]

2 hours ago, H0R53 said:

There are three components on the board I can get to without taking the whole thing apart. One is labeled IC2, ZD2 and ZD3. There's an R2 underneath the motor that I can't reach without removing the motor. Any of these?

 

 

no idea 

[Enderman]

You can't do that.

You need a fan that's designed to spin both ways if you want to be able to reverse the rotation, which almost all computer fans cannot do.

They are brushless fans and contain a PCB that changes the phases in one direction only.

The blades are also designed to move air in only one direction.

[H0R53]

[Guest]

Push/pull/push-pull. Why would you do trough all this trouble? Them fans are side-mounted anyways, so you would only see a side?

[H0R53]

Just now, Dutch-stoner said:

Push/pull/push-pull. Why would you do trough all this trouble? Them fans are side-mounted anyways, so you would only see a side?

It's mounted sideways so I can see either fan. The 'exhaust' fan looks ugly when it's on flipside.

[Electronics Wizardy]

12 minutes ago, H0R53 said:

So short the diode?

and now it goes boom, it normally has a capictor.

 

It would be a good amount of work to make it spin the other way as its a brushless dc motor and you have to mess with the hall effect sensor.

[H0R53]

Just now, Electronics Wizardy said:

and now it goes boom, it normally has a capictor.

 

It would be a good amount of work to make it spin the other way as its a brushless dc motor and you have to mess with the hall effect sensor.

This fan is from an old Celeron machine, the fan looks really cool so I painted the blades red and lef the motor mount black. I doubt it's got any sort of sensors like that.

[Electronics Wizardy]

1 minute ago, H0R53 said:

This fan is from an old Celeron machine, the fan looks really cool so I painted the blades red and lef the motor mount black. I doubt it's got any sort of sensors like that.

i have taken fans apart from the 80's there all the same, bushless dc motor with a hall effect sensor, take it apart if you want, if won't help.

[H0R53]

1 minute ago, Electronics Wizardy said:

i have taken fans apart from the 80's there all the same, bushless dc motor with a hall effect sensor, take it apart if you want, if won't help.

Alright, I trust you.

 

I know some PSU fans can reverse direction.

[Electronics Wizardy]

5 minutes ago, H0R53 said:

Alright, I trust you.

 

I know some PSU fans can reverse direction.

never seen one.

 

The fans that spin in reverse have to have it as a feature, these aren't normal dc bushed motors.

[H0R53]

6 minutes ago, Electronics Wizardy said:

never seen one.

 

The fans that spin in reverse have to have it as a feature, these aren't normal dc bushed motors.

Motors themselves are designed to be able to reverse. The fans though, maybe not.

 

Fan in question.

Edited May 6, 2017 by H0R53
Image

[Electronics Wizardy]

8 minutes ago, H0R53 said:

Motors themselves are designed to be able to reverse. The fans though, maybe not.

 

Fan in question.

Not all motors can be reversed. 

 

 

Take the sticker off the back of the fan, pop the retention clip off and the blades will come right off. 

[H0R53]

1 minute ago, Electronics Wizardy said:

Not all motors can be reversed. 

 

 

Take the sticker off the back of the fan, pop the retention clip off and the blades will come right off. 

How do you think I painted it? That ain't no noob paint job.

 

Edit: Flipping the magnet on the center piece? Would that work or just prevent a spin?

[Electronics Wizardy]

8 minutes ago, H0R53 said:

How do you think I painted it? That ain't no noob paint job.

 

Edit: Flipping the magnet on the center piece? Would that work or just prevent a spin?

That just let's you take the fan blades off. Won't affect the spin. 

[H0R53]

Pic of fan without rotor

[H0R53]

1 minute ago, Electronics Wizardy said:

hat just let's you take the fan blades off. Won't affect the spin. 

No, on the rotor there is a magnet - what if I reverse the polarity?

[Electronics Wizardy]

7 minutes ago, H0R53 said:

No, on the rotor there is a magnet - what if I reverse the polarity?

Probably not work as your messing with the hall effect sensor.

 

I got a bin of old fans. Let me try this on one of them. 

[H0R53]

Just now, Electronics Wizardy said:

Probably not work as your messing with the hall effect sensor.

 

I got a bin of old fans. Let me try this on one of them. 

It's probably glued so it doesn't spin in place. Be careful.