Running Two Batteries

[Alan Anderson]

Originally Posted by BBray_T1296

You could make an improvised heat sink by wrapping them in aluminum foil...

Unless you wrapped the foil very very tightly (tightly enough to rip it), it's going to trap air between the layers and act as an insulator.

What you need for cooling motors isn't a heat sink, it's a radiator. The black surface of a CIM is probably a lot more efficient at radiating IR than shiny aluminum foil, but I have no data to back up my supposition. Fins and a fan will do a much better job of cooling the case than any amount of foil wrap. But it's the temperature of the windings inside the motor that matters, not the outside of the case, and a CIM isn't particularly good at getting rid of its interior heat to begin with.