RC-Monster Forums - View Single Post - Where are these New Power ESCs people are talking about?

BrianG · 04.29.2010, 11:50 AM

ESC heat is a function of current, FET switching losses (from the non-perfect switching action), the FET's Rdson value, and any PCB copper losses. The voltage applied only indirectly affects heat (more voltage on the same system will increase current, and therefore heat).

So, for an ESC to run cooler when using the same vehicle, voltage, motor, gearing, etc, the ESC would have to use better (faster switching action and lower Rdson) and/or more numerous FETs.

If you want to reap the benefits of a HV ESC, you'd have to use higher voltage on a lower kv motor (or gear down if using the same motor). The idea is the produce the same power with higher voltage (which means lower current).

Simply changing one ESC to another (HV or not) while not changing anything else will likely not help your heat issues unless the ESC is designed better and/or with better components.

	(#4)
BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	04.29.2010, 11:50 AM ESC heat is a function of current, FET switching losses (from the non-perfect switching action), the FET's Rdson value, and any PCB copper losses. The voltage applied only indirectly affects heat (more voltage on the same system will increase current, and therefore heat). So, for an ESC to run cooler when using the same vehicle, voltage, motor, gearing, etc, the ESC would have to use better (faster switching action and lower Rdson) and/or more numerous FETs. If you want to reap the benefits of a HV ESC, you'd have to use higher voltage on a lower kv motor (or gear down if using the same motor). The idea is the produce the same power with higher voltage (which means lower current). Simply changing one ESC to another (HV or not) while not changing anything else will likely not help your heat issues unless the ESC is designed better and/or with better components.