Showroom DIY 3 DOF inspired by DOF Reality H3 model.

My motors are off an invacare Fox, I’ll look into there power, so am I looking for something with high torque or speed are just a good mix as it’s not having to move the whole weight it’s split between two and it’s pivoting on the U joint?

If I remember correctly, most users recommend motors with a 50:1 gear ratio. And yes, the whole weight it’s split between two motors and it’s pivoting on the U joint.

I’ve found another motor with a 32:1 ratio, at 12V it goes at 60rpm and 24V 140rpm but I would rather use them at 12V but will 60 rpm be enough or do I need to run them at a slightly higher voltage? Also it’s a 350W motor with a peak of 1250W

I was also wondering do you take the break of the back of the motor? Because it would make it more compact

I'm not a specialist in DC motors, but to me, the specifications of this motor seem sufficient. You can try using it with 12 volts, but I would consider using motor drivers that also accept 24V power. That way, if the performance doesn't meet your expectations, you have the option to increase the voltage.

As for the motor brakes in my rig, if I were building it today, I would use them to safety reasons and keep the rig in a horizontal position without the need to power it on. Alternatively, they could provide the additional option to adjust the rig's position when I’m not using motion. It’s possible that the brakes will return to their place and be used for these purposes if I decide to modify the rig in the future. However, my plans already include building a 6DOF platform using these motors, and I’ve planned to incorporate the motor brakes into that setup as well.

Hi, wow, I read about 2 IBT2 connect per motor for the first time. Can you show directly how U connect them? I try to make linear actuator with IBT2 but for about 5 min it start to be very hot. I have idea to plant another radiator but I saw your thread so if U be so kind and show your solution? Another question, my prototype is on 120 volt small dc motor maybe this is the hot it's problem? Motor is not hot and working fine for the test but ibt for about 5 min r hot like hell
https://youtube.com/shorts/b1Rwtmwvjvs?si=491stEp5lzPJzIsu

Hey, nice construction you are building. Below I’ve included the schematic for connecting two IBT-2 drivers to a single motor. Connect them using configuration A, as I couldn’t get the motor to work with configuration B. I’m not entirely sure, but there might be an error in that schematic with configuration B. There are more info on the forum about the double driver to one motor connection if you want to find them.

Heat transfer in the case of IBT-2 is a known issue. You can modify the design a bit and add an additional heatsink. You can also add a fan near the drivers, which will help dissipate heat. After the modifications, several IBT-2 units power three 300W motors for me. Without the modifications, the IBT-2 couldn’t handle two minutes of continuous motor operation.

Since there are many problems with the stock IBT-2, it’s worth considering stronger motor drivers if you don’t have the time or willingness to modify them. The IBT-2 has current and thermal protections, but after several overheating events, shorts occur in the transistors, and it seems that the actual current capacity of these designs is significantly lower under continuous load. Good luck with your project.
There are more videos on you tube how to mode IBT-2 but below is a fairly long video where I tried to show how I made this modification.