6s on M Monster

[Pdelcast]

Originally Posted by BrianG

When testing different BECs, it seems the coil is the hottest part at any load and input voltage, so that makes sense. The only BEC I've ever tested where heat is more distributed is the Western Robotics HV; but that uses a very large/robust coil so it probably has enough mass to absorb it better.

It's an interesting problem. We are using a flat wire wound coil in our BECs (where the coil is wound like a slinky), which give VERY high saturation currents, but only so-so RMS current values. Flat wound toroids are just now starting to hit the scene, which give even higher saturation currents, lower noise, and higher RMS currents. But they are tall -- which doesn't fit well into RC applications. But every year, we see higher and higher currents in smaller coils. I would have thought that coil technology would have peaked 20 years ago -- but they keep getting better densities.


--- And BTW, sorry to jack the thread for a technical discussion

[BrianG]

Gotta remember people weren't really concerned about small size/light weight 20 years ago. These days, everyone wants their entire world to fit in their pocket, so naturally, that demand requires more advances.

And, techy thread jacking is the norm here. At least it is related to the discussion (if a tad remotely).

[spcpicard]

Originally Posted by BrianG

Since both are switching BECs, I would expect either to be comparable efficiency-wise. If your goal is simply higher voltage to get the most out of your servo, then the CC BEC is gonna be the desired option. If you are worried about the CCBEC possibly failing (which generally means it will either output 0v or full battery voltage), then you could wire the system up so that the CCBEC only powers the servo, but the receiver and any other servos run directly off the ESC's BEC.

this actually sounds ideal, is there a easy way to do this?

[johnrobholmes]

Use a Y harness that routes power from BEC to servo, and the extra lead goes to RX and passes only signal wire.

[spcpicard]

Originally Posted by johnrobholmes

Use a Y harness that routes power from BEC to servo, and the extra lead goes to RX and passes only signal wire.

so I would need to remove the signal wire from the cc bec (orange) and only have the orange wire on the other side of the y harness? Leaving all the wires from the esc intact and plugged in normally? Or just hook up the black and red wire from the bec to the black and red to the servo and just plug the signal directly back into the reciever? Does the signal wire from the CC bec have to be plugged to something?

[johnrobholmes]

Just remove the red and black (or just one) that go from servo to RX. No need to remove signal from the external BEC. No need to do anything else.

[spcpicard]

Originally Posted by johnrobholmes

Just remove the red and black (or just one) that go from servo to RX. No need to remove signal from the external BEC. No need to do anything else.

thanks!