I have a Sabertooth 2x32 motor controller, which will be used to drive a load with a lot of rotational inertia. It will be battery powered, with Lead Acid batteries. I am a little concerned about the issue of feeding a lot of current back to the batteries, when the regenerative braking is used. Also, for testing, I am using a power supply and some small motors without much of a load on them, and the power supply should not be permitted to get any voltage back from the regenerative braking.
I imagine I should consider using some "voltage clamp resistors" as a place to dump my back EMF from the motors, when I am stopping them. I see that is an option with the Sabertooth motor controllers, but they don't go into detail. I see that there are two connectors for powering a electromagnetic brake, or to connect the voltage clamp resistors. But, it is limited to 8 Amp. If the motors can be driven with 32 amps, then if I stop them at the same rate that I accelerate them, I may be needing to dump current in the range of 32 amps x 2. Though, I am doubting it is that simple.
My drive system will be a v-belt drive, so that I can deliberately permit the belt to slip to protect the gear motor from being back-driven too much. I.e. a cheap over-dive clutch. So, that may also protect me from getting an extreme amount of current from the motors as they stop.
Perhaps, when I am in my final version, with the batteries installed, I should have both the regenerative braking and the power resistors there, so that I can have them both function as my current dump. But, I have no idea if this is something that can be configured on the Sabertooth. Perhaps I can do it with components, by simply putting a resistor in series with a diode at the battery wire. So, when the current is driven back into the battery, the resistor will be acting in parallel, and so take some percentage of the current. When I am drawing power from the battery to the motors, the diode would allow the current to bypass the resistor.
I don't have much experience with this stuff, so I felt it would be wise to run this by you all, and see if my thinking is reasonable.