ESC braking causing spike?

[Nick]

I'm interested to know peoples thoughts and if you have collected any data on what seems to be a technical wide issue with braking on BL ESCs.

It seems, that when you brake, there is a voltage spike. When running on the limit, such as the Castle MMM on 6s, the spike can quite easily damage or break the controller.

I recently broke a Mtroniks Brushless setup (a UK band) and was interested to find this problem here too, this is what they said:

we have a component that protects the chip on the control side of the controller, because we are doing quite high current, especially when hitting the brakes we need to protect things and it was this component that failed. Probably whilst under braking!

This makes me want to know more. What is the actual process in braking that causes this spike?

And how can it be resolved, other than using mechanical brakes... or not braking at all.

Would lowering or even increasing the brake curve reduce this risk?

Thanks,
Nick.