Hitec 5995tg Robot Servo Fix - Help save your robot servo from overheating

[heyok]

I don't mean to rain on anyone's parade, but thermal heat sink compound is only meant to fill in the tiny imperfections of the flat surface of the component you are trying to protect and the heat sink itself. The general rule is the thinner the better. Filling the entire vacant area above the motor drivers will likely help somewhat, but probably not as much as you might hope.

If there was a way to get a flat piece of aluminum to set against the flat surface of the transistors (with some heat sink compound in between of course) that would help to spread the heat over a larger area. If you were able to also mechanically fix that piece of aluminum to the servo case at the same time that would also help move the heat along.

 

[C.O.Crawler]

so has anyone tested this out, running in the heat, yet?

 

[renoirbud]

hey

It would be awsome if someone made the bottom of the case out of ALU. That would likely prevent alot of problems.

 

[birdie_in_texas]

or spend another $20 for the 5955 heatsink cases..

 

[kevinlongisland]

so has anyone tested this out, running in the heat, yet?

Yup, it's been thoroughly tested in the 110 plus degree Arizona heat. I fried two robot servos before doing this mod. After I did this to my servos, I haven't had one fry yet.

And yes, this compound was intended to be placed between two flat surfaces. And no, we are not using it how it was originally intended. But it does seam to work when used like this.

Personally, I don't think the aluminum case or a new aluminum cover would help much. I believe the main problem is that this one semiconductor does not have a good path to dissipate the heat. Therefore the temperature continues to rise until failure. This one specific semiconductor needs a heat conductive path to pull the heat away. Hence covering it with heat transfer compound that allows the heat to dissipate into the case and surrounding components.

 

[heyok]

Yup, it's been thoroughly tested in the 110 plus degree Arizona heat. I fried two robot servos before doing this mod. After I did this to my servos, I haven't had one fry yet.

..snip...

Cool. I'm glad it is working for you! Can't ask for more than that!

 

[DKNguyen]

You could cut a big hole in the lid (just so the lid can still hold onto the screws which keeps everything else in place and then fill the entire thing in with thermally conductive epoxy.

 

[frdtrkguy]

or spend another $20 for the 5955 heatsink cases..

Has anyone done this? Does it fit for sure? Anyone have the part#? I have yet to fry one but it does get really hot, hotter in fact than any other servo I have tried in 15 years.. And that is on a 2.2 comp rig:roll:

 

[DKNguyen]

Has anyone done this? Does it fit for sure? Anyone have the part#? I have yet to fry one but it does get really hot, hotter in fact than any other servo I have tried in 15 years.. And that is on a 2.2 comp rig:roll:

DOesn't the 5955 come with a heatsink case standard? Or do you really mean the the 5995TG robot servo that's warrantied for 7.4V? They fit. It's the same servo dimensions. Except...I think the motor might be glued in...I've never taken apart a servo enough to find out.

 

[666]

I'm running 5955's with the heat paste, I noticed a 20 degree temperture drop upon installing the paste and have been running them like this for quite some time! I also run my 5955's at 7.4 direct.


Thanks a bunch to Kevin for finding this trick!

 

[LIKES2CRAWL]

Well I wish I knew about this befor I toasted my 5955, I guess I better get this put in the new ones befor they get toasty too. Maybee Kevin should pick this stuff up as a new product to carry."thumbsup"

 

[DKNguyen]

You could probably smear almost anything onto those MOSFETs. Most anything is a better thermal conductor than air.

 

[kevinlongisland]

You could probably smear almost anything onto those MOSFETs. Most anything is a better thermal conductor than air.

I agree. The only other consideration would be something with low electrical conductivity.

 

[roktoy]

I'm running 5955's with the heat paste, I noticed a 20 degree temperture drop upon installing the paste and have been running them like this for quite some time! I also run my 5955's at 7.4 direct.

Curious.....how did you make your measurements?
Jay

 

[666]

Curious.....how did you make your measurements?
Jay

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXNKP6&P=ML"thumbsup"

 

[roktoy]

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXNKP6&P=ML"thumbsup"

Ah ok.....I guess just aimed at the back of the case.....
Jay

 

[666]

I checked mainly the heat sink and back of case.

 

[Rckcrwlr]

Just a heads up. I did this about a month ago and one of my servos fried, not because of this.

I just received a call from Hitec...the warranty is void due to the presence of this paste. :shock:

He said that unfortunately they cannot fix it under warranty due to the paste being added.

I was asking him what options I have...My servos keep thermalling. He gave me a contact that I need to call on Tuesday. I will keep you updated.

John

 

[Calderwood]

Just a heads up. I did this about a month ago and one of my servos fried, not because of this.

I just received a call from Hitec...the warranty is void due to the presence of this paste. :shock:

He said that unfortunately they cannot fix it under warranty due to the paste being added.

I was asking him what options I have...My servos keep thermalling. He gave me a contact that I need to call on Tuesday. I will keep you updated.

John

And what did they say?

 

[Stick King]

prez

id like to know as well, what did hitec have to say about the issue?

Just a heads up. I did this about a month ago and one of my servos fried, not because of this.

I just received a call from Hitec...the warranty is void due to the presence of this paste. :shock:

He said that unfortunately they cannot fix it under warranty due to the paste being added.

I was asking him what options I have...My servos keep thermalling. He gave me a contact that I need to call on Tuesday. I will keep you updated.

John