Quote:
Originally Posted by GordonFreeman
So what was the final resolution on this? Do cheap lipos cause ESC failures or not? If so could somebody please explain the technical reason for this. I'm just a Mechanical Engineer Dummy, so 'splain it slowly. All I saw in these posts was something about voltage ripple, didn't make sense to me. I don't understand how a DC power source would "amplify" a voltage ripple, cheap or otherwise.
Thanks
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It's not really the motor or ESC, it's the batteries that get hit hardest. If they can't keep up with the wild voltage spikes, they end up not being able to control the voltage being sent back through the ESC. This causes it to switch parts that shouldn't be on on, resulting in a situation where the ESC is switching on and off thousands of times a second. This is called RIPPLE EFFECT. This will boil the liquid in the caps which then leaves the ESC fets open to the voltage spikes, and they will blow almost immediately, hence the fires seen recently in Flux ESCs.
The problem is the MMM esc has such a low internal resistance, it is more vulnerable to any changes in amperage and voltage outside of it's normal operating range. This is why Castle say you MUST use high quality cells that can control and absorb the voltage created during regenerative braking. Rather than lumping it back through the ESC.
Hope this helps
