Jeti should think helicopters

[Puttputt maru]

This is my fourth helicopter now with a Jeti Mezon in it and Jeti was obviously thinking planes when they did them.



In a plane the motor is in front (most of the time) and the batteries and Rx are in the back so the wires exiting the way they are make sense for simple routing,
If you look at most helicopter set up the ESC is in the front and the Rx and FBL unit are in the back. So all the "spaghetti" of wires would be better to exit the other way around with the motor wires for easy routing. So you are stuck having to bring them from full front to back.



A Mezon heli version would be nice

[mkovalcson]

I don't believe that you want your BEC cables exiting near the motor cables for noise/interference reasons.

Kontroniks has warnings to NOT run the motor cables across the top of the ESC for that very reason.

[Puttputt maru]

I thought that was what the toric ring were for, which Jeti nicely include for us. Running on top would be a touch stupid any way the heat sink being there, and wiith nothing to attach and stabilize the cable with.

[mkovalcson]

Originally Posted by Puttputt maru

I thought that was what the toric ring were for, which Jeti nicely include for us. Running on top would be a touch stupid any way the heat sink being there, and wiith nothing to attach and stabilize the cable with.

A BEC circuit is not going to give you PERFECT smooth DC voltage to begin with. That is what the ferrite rings are for. I would never recommend running BEC close to your motor wires.

However I am now able to measure this on my bench, so I should be able to get some measurements of this.

I was looking at a PPM signal for the first time on my new oscilloscope this morning

[Puttputt maru]

Fair enough, thanks for the warning. I will run my wires to the opposite side of the motor wires, which I always do for a cleaner wiring pattern anyway. But now it will be for a more learned reason
Still in a close confine. It will be interesting to know what is a good distance with your testing. I wonder if wire insulation has some bearing on it too?

[cbdane]

Originally Posted by mkovalcson

A BEC circuit is not going to give you PERFECT smooth DC voltage to begin with. That is what the ferrite rings are for. I would never recommend running BEC close to your motor wires.

The ferrite rings form a common mode choke and do not smooth the DC supply. You essentially get a 1:1 transformer that cancels any electrical noise induced on both leads such as from the ESC. The purpose is to prevent this noise from getting back into the receiver.

[Puttputt maru]

Originally Posted by cbdane

The ferrite rings form a common mode choke and do not smooth the DC supply. You essentially get a 1:1 transformer that cancels any electrical noise induced on both leads such as from the ESC. The purpose is to prevent this noise from getting back into the receiver.

As I thought but not being an expert in that field I did not want to contradict people who seem to know better.

[SoftShell]

Agree with the 'noise' issues already mentioned.
But I think it is also a matter of design practicality.

The control electronics are at one end of the circuit board, and power semiconductors are packed at the other end in nice neat rows - where they can be lined up for contact with the heatsink.

If you think about it - most ESC's out there have a similar layout.

[Puttputt maru]

Something else that would be neat with the Mezon is a magnetic switch as a on/off switch something easier to remove than the multiplex switch on the max BEC 2 in the picture below. (the MAX BEC 2 also comes with a magnetic switch)

[tracernz]

Originally Posted by cbdane

The ferrite rings form a common mode choke and do not smooth the DC supply. You essentially get a 1:1 transformer that cancels any electrical noise induced on both leads such as from the ESC. The purpose is to prevent this noise from getting back into the receiver.

It's primarily to choke the noise from the BEC. This is why you don't need them on a linear BEC.

[apostolosnt]

Just converted my two helis from jive to mezon. There are two things that could make life easier: longer motor cables and plug-in master/slave/rpm cables so you can adjust it to your setup. It s easy enough to run bec cables away from anything else but to get a ferite on I had to add cable to them and I had to lengthen the motor cables on my 7hv to reach the motor. It s not a problem but I just don t like it...


Sent from my Samsung WindowsPhone

[tracernz]

Did you mount it with the motor cable end facing the motor? I found the motor leads too long if anything on my 7HV. The signal wires were all quite a bit too short though.

[apostolosnt]

Originally Posted by tracernz

Did you mount it with the motor cable end facing the motor? I found the motor leads too long if anything on my 7HV. The signal wires were all quite a bit too short though.

The other way around. The cables just needed 2-3cm extra length. I usually try to keep the BEC cables as short as possible and run a Y harness, thus this setup.
Regardless of the setup I mentioned longer wires cause it costs nothing and it would fit any application easier.

[cbdane]

Originally Posted by tracernz

It's primarily to choke the noise from the BEC. This is why you don't need them on a linear BEC.

Won't do it, not with both pos/neg leads looped through it. Only affects common modes. Equal and opposite currents (of which BEC ripple/noise qualifies) of any frequency pass right through.

[mkovalcson]

Originally Posted by apostolosnt

The other way around. The cables just needed 2-3cm extra length. I usually try to keep the BEC cables as short as possible and run a Y harness, thus this setup.
Regardless of the setup I mentioned longer wires cause it costs nothing and it would fit any application easier.

I like being able to mount the Motor straight to the ESC and then run my BEC cables as far away from everything as I can and put the ferrite rings at the very end.

[mkovalcson]

I just realized that picture does show another option, running the BEC cables out the side of the ESC which works perfectly in this installation.

I guess that different ESC layouts work better on different helicopter designs.

[Puttputt maru]

The consensus on ferrite ring seem to be to have them as close to the Rx as possible from what I have browsed around.

[mkovalcson]

Originally Posted by Puttputt maru

The consensus on ferrite ring seem to be to have them as close to the Rx as possible from what I have browsed around.

Agreed. This is my Forza. I could have put one more wrap on the ferrite ring, but then there wouldn't have been any slack in the wire.

[apostolosnt]

If you don t have the length and don t want half meter wire from esc to rx you can use a ferrite bead too running the cables straight through it.

I assume that it is not as effective as a ring due to the smaller wire length through it. Anyone with more electrical knowledge please comment.


Sent from my Samsung WindowsPhone

[Puttputt maru]

While searching for more, I came across this:

From an electronics/engineering standpoint, a ferrite ring is not necessary on a 2.4Ghz system because the noise that WOULD affect your radio is below the 2.4Ghz band. But RF isn't the primary concern for an electric model aircraft power system. That is not why some manufacturers include a choke on their ESC leads... The problem is that the ESC is switching high current loads, and is also supplying power to the RX. The switching activity generates a fair amount of "switching noise", transients in the ESC's power circuits which can couple through the connections to the RX. The RX is a microprocessor, and like any computer circuit it likes "clean" power. Transients and fast-edged glitches on the power supply can cause unintended switching of RX's digital circuitry, leading to a "crash" of the RX's processor, leading to a crash of the model.

A Ferrite Bead/Ring, also called an RF Choke may be less critical for lower-power installations, it's the higher voltages and larger current draws that tend to generate the bigger spikes. But as a general rule, irrespective of the frequency of your radio, the larger your battery pack the more you might actually need a choke.