Question Dc motor driver proplems

Hi everyone . A am currently in the midst of converting my diy 2 dof into a 3 dof. roll, pitch AND heave. This means that the motors need to work much harder, since the rig can not be in balance.

The problems:

I hooked the ibt_2 drivers up to the motors and tested with some simple up and down motion, but suddenly the motor just stopped. There was no smoke or smell from the drivers or the motors. The driver was not even hot.

The ibt_2 drivers have been running just fine before with very smooth motion and plenty of power without getting hot at all.

I am therefore thinking if it would be possible to hook two drivers in parallel and get double the amperage. Would this work? Have any of you tried it? Can you recommend some other motor drivers that would be more suitable?

Also, i am planning to install a spring at the universal joint, so the motor don't need to work as hard. Have you tried it? How do i choose a spring?

Looking forward to the replies.

Cheers.

Specs:
- 24v
- SMC3 (arduino)
- 3 Wheelchair motor 300w each (12,5A but peak current can usually be higher)
- 100a 24v 2400w power supply
- propperply around 120 kg when fully loaded
- Around 100mm of heave motion at max
- BTS7960B H-bridge drivers

yes you can use 2 of them at once

they automatically shut down if they get hot

check my build to see the 100A motor drivers i use

Ok. I have made this drawing of how i think it should go together. (the wires to the arduino is obviously not correct and is only for illustration)
Is it guanteed that the load would spread evenly to both drivers?

Thanks!

That looks correct

The ibt-2 is generally not able to cope with larger and longer current draws that is usually associated with heave. It has a flaw in its design that doesn't allow much heat to get transfered to the heat sink so they constantly shut down or burn up.

Ok. I have already ordered 5 more drivers to put them in parallel, so we will se what happens. The weird thing is that they did not get very hot with 2dof, compared to the vhn5019 driver that i used before. I am also thinking of adding a heatsink directly on the chip anyways.

What driver do you think is more suitable?

Thanks.

this style of driver is 100A and very powerful

https://www.aliexpress.com/item/32728776675.html


i have used them - they have been 1oo% reliable

Nice. I can't find them in the EU so if this fails i will try those. Thank you very much!

what happened with you bro? i have same problem you have, did you solve it or you order the 100A driver? help me if you can

Hi! Yearh i have been kind of silent working on and off on this project. I got 3 of the VNH5019 drivers and just ran them in parallel mode. That gives me 60A of current. I also decided to watercool them, just because the air cooling was way too loud, and also just for fun. I will make a follow up on the projekt when i get time.

Take care!

i tried to connect to ibt-2 as one motor but not helped, you advice me to purchase the 100a driver ?

Sorry for the slow reply, i have been busy.
I have not tried the 100a drives, but i have heard they work well. But since the VNH5019 drives cost about the same i would say go for it! The reason i chose the pololu drives was because there was a great deal of technical information about them, and it was from a reputable brand, so i wouldn't run in to quality problems.

Oh, i ordered the 100a driver, hope its be great

Tell me, where can I find a wiring diagram for this beast?