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HelicopterRadio - Servo - Gyro - Gov - Batt › Diff Amp ratings on ESC's
03-11-2006 04:46 AM  11 years agoPost 1
Vendetta

rrVeteran

Miami, Florida 33173

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Dont know a whole lot about ESC's... When would you use a 10A ESC vs a 25 Amp ESC? Does it have to do with the discharge rates on the lipos?

Also why do some have a usb link? to program cut offs maybe?

Thanks

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03-11-2006 11:44 AM  11 years agoPost 2
z11355

rrMaster

New England

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no, the A rating is the maximum continuous output amperage the
ESC can provide before smoke and flames start shooting out of it.

For a Trex, you want a MINIMUM of 25 w/ 33-35 strongly preferred.

The USB link is called a 'feature'. Certain mfgrs put them in to
differentiate theirs and to make it easier to program or load
new firmware vs. other mfgrs that force you to send the unit
back to the factory and/or use beep-beep for programming.

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03-11-2006 04:13 PM  11 years agoPost 3
Vendetta

rrVeteran

Miami, Florida 33173

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Isnt the output amperage based on the batt?

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03-11-2006 09:12 PM  11 years agoPost 4
fritzthecat

rrKey Veteran

Virginia Beach, VA

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In an electric drive system there are three major components.
The Motor
The ESC
The Battery

The Motor draws amps. How many depends on the motor design and the load. It also has a max amp limit. If it draws more than the max it will melt down.

The ESC has a maximum amp rating. This is how many amps it can control. More than that and it will melt down.

The battery has a maximum amp draw limit. This is how many amps you can draw out of it before damage to the battery occurs. Usually rated as the capacity of the battery times a 'C' number.

How many amps are drawn through the system depends on the motor and the load placed on it. Looking at a Trex for example, a Mega 16/15/3 motor would draw up to 30 amps short term during 3d flight. So you need an ESC that can handle those 30 amps plus a little extra for safety. The battery must be able to supply 30 amps for bursts of a few seconds and at least 20 amps continuous.

Then there is the issue of voltage but that's a seperate issue. The battery voltage determines the voltage of the electric system. It can be from 3.5V for a single Lipoly to 75V for a 20 series lipo.

Fritz


'Send Money, Women and Guns!'

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HelicopterRadio - Servo - Gyro - Gov - Batt › Diff Amp ratings on ESC's
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