Reasonably Priced 100A Motor Controllers

If you are searching for motor controllers that are reasonably priced and capable of handling high amp loads, I can enthusiastically recommend the following controllers. They are available on ebay and aliexpress for around $50 US. I purchased 3 of them after burning through a bunch of cheap $15 IBT2's. These 100A controllers have been working flawlessly for me so far. They advertise that they can handle TWO 100A continuous loads, with spikes up to 260A momentarily. Though I have not tested that capability, I have been using (3) 40AMP 12V motors for a while now and the controllers have never gotten hot, in fact only just barely warm. Also, I do not run fans on them. Just holding them you can tell how much heavier, bigger, and higher quality they are than the IBT2. Even with (2) IBT2 in parallel, I would still fry the IBT's, but no issues with these! Give them a shot if you are running into issues with IBT2 or other motor controller overheating. Specs appears below along with a wiring diagram I made for connecting the controllers to an arduino. Big shout out to Gadget999 for telling me to have a look at these!

so far they have been faultless

100A and such a small heatsink?

I use a fan and thermoswitch on mine

100A at 24v is 2.4kw per motor !!! A lot for a motion sim

That's why I said it, it's a lot of power

Perhaps they are optimistic, I have not tested their failure capacity! But I can assure you that they handle my 40A motors without breaking a sweat!

Can this be used with SMC3 ? or you used custom Arduino code ?

yes - you can use with SMC 3

Oh nice ! directly without any changes to the code ? Mode 1 or 2 ?
Sorry for asking without looking at it myself, just not home right now and kinda excited by this little controller.

I cant remember which type off the top of my head - but the driver will work

I just ordered this controller on your recommendation and feedback in usage. But because this does have any type or serial nr finding examples for this is quite hard. Does/can someone here provide me an example arduino code that fits the schematic as shown in the first post?

Hi CoolZero, I just use the standard SMC3 utilities with an Arduino Uno R3 clone with the sketch set to Mode 1 (which is the default I believe) and it works great. Let me know if you have any other questions!

I’m new to what SMC3 is, but I’m looking for just to control the connected motor by arduino (speed , and forward/backward) for remote controlling it trough pwm.

meanwhile I wil take a deeper look at what SMC3 is and if it can be used for what I’m looking for

I'm using one of theses with smc3 with power set at 245 and my 18v led psu trip(turn off a few second and restart ).
Any ideas?
Before I was using ibt2 and the psu never trip.

also if I set power in SMC to 200, it won't trip.

You are pulling more current than the psu can provide

Use a 12x battery to buffer the power

I don't think so (unless the IBT-2 has some sort of current limiting), as it was working with IBT-2 with same setup and also I saw something really weird / interesting, if I put longer wire for the connection between the motor controller and the motor, the PSU does not trip.
I wonder what exactly change when I use longer wire. I suspect it possibly filter something. no idea lol

But I may try the 12v battery to buffer as you said. Only down side of this is that I'm supposed to use 18v.

the wire is probably too small in diameter and is restricting current flow

I bet it gets hot over time !

What a wonderful friend!
I also bought 2 boards to use in my 250W motors.
I need to handle large loads on my sim.
I'm designing a 3dof sim hope it works just like yours!
Sorry I don't speak english and I use google translator

Hello, good to see this product. Thanks to that I searched a little more and I found this:



It seems to be the same one but single channel instad of dual channel. The channel-price is better if buy the dual channel but for those who want drive three motors maybe install one single channel for each motor is better solution, IMO for these reasons:

1) You can connect two motors to one dual channel and one to a second board, in this case you'll have one free channel that you paid for it and will never be used. I'm not confident to install two 750W 24V motors to one dual channel.

2) Buy three dual channel, one per motor, is "costly".

My tougth is to go ahed for three single channel, what do you think?

If you couple 2 motors without backlash they act as one

Ok but I don't understand your reply nor how it is related with mine, sorry.