PGSaw Motors max. Temperature ?

Hello all

i have for quite some time now a seat mover with traction loss with arduino smc software.

Works great! Only "problem" i have now since i got my Heusinkveld ultimate pedals, that my motors are getting warm.
Reason is that the brake pedal needs a lot of brake force now, thats why the motors warm up.

They have a outside temperature of around 40C° after maybe an hour heavy racing in iracing.

Also asked PGSaw if he knows the max temperature but so far he couldn't tell me yet.

So i know quite a lot here use these motors, or have similar which maybe have temperature specification.
Is it save to drive em like that, or do i have to change something, maybe optimize the angles or levers ?

I know from my 3d printer stepper motors that they run at 60°C all the time, but this is no stepper motor.

Yeah was thinking about the fans, but not sure it helps any because of the flat round surface of the motors ?

Do you know which member it was that drilled holes in those pgsaw motors, quite dangerous for the motors ?

I attached a picture of my sim.

Correct, you dont have Any real leverage going on there. those motor's are bound to run hot hot with those angles.

Your angles are trying to lift rather than tilt. Which is easier; lift a heavy object or tilt it over? Those motors are working really really hard.

This image can help you to take advantage of the full potential of your motors.

http://hyperphysics.phy-astr.gsu.edu/hbase/imgmec/tordef.gif

Hmm how much angle do i need ? Currently the angle between the seat frame and the rod is 30°.

This is the way to achieve tha maximum force...


Try to have 90 degree angles at both ends at rest position.
A 90 degree angle on the motor side is easy.
On the shoulder side you should target for as close to 90 degrees as your design permits.

This next pic explains clearly why you need to be as close to a 90 degree angle to maximise performance.

If the angle between F and R is 90 degrees (θ=0 degrees) then cosθ=1 so the force result is maximised.

Ah thanks. So if i mount the motors further back and maybe a bit higher from the ground, and keep a 90° angle at motor side, should help the situation i'm in ?

if you follow the above then you reduce the stress of your motors for a given task.

Maybe I’m the only one with this opinion but your motors are barely getting warm after one hour. I don’t think you have a problem. My motors get that hot in 5 minutes and can run 55c with rally and F1 type driving. Of course, not all motors are the same. Imo if you don’t smell any burning or hot type smells or your motors aren’t loosing power when they seem hot then they probably aren’t getting to hot.

Onetime I had some motors on a platform that somehow got left on for three hours. By the time I found out they could barely hold up any weight anymore nor could I touch them they were so hot. I thought they would be ruined but after they cooled down again they worked fine.

Hello Lorien31! I am starting the construction of my first 2dof. I bought two PGSaw motors like the ones you used.
In my case they are engines have the following characteristics:
- Ratio 1:50
- 180w
- 12V
- 50NM

In order to design a suitable framework, could you tell me if your engines are like mine?

My motors do have a gear ratio of 25:1, with different lever length you should be fine i guess.

Thank you very much for your answer! I will surely inspire you in your frame