Wattage of Wanderer motors

[squeeforever]

daniel is our very own danfi.

[coolhandcountry]

Daniel is aka dafni aka dafnerd.
There may be a video of that dance somewhere. ;)

Originally Posted by coolhandcountry

There may be a video of that dance somewhere. ;)

i dont know if i want to see it

[Serum]

there is some time needed for the low to high transition, albeit small

and for this very reason, the controller isn't 100 percent efficient.

At DC_on, the fetts are at their lowest R. But i guess you knew this. ;)

[BrianG]

Yeah, I did. :)

Really though, I think the controller almost has to add a little time to go from on to off or vice versa, otherwise the back EMF spike from a perfect square wave would be very bad on the electronics! So, I guess that little bit on inefficiency is probably good in a way. I wonder if these ESCs use avalanche diodes to prevent such a thing? I don't even have my ESC yet (but was ordered today!) and already I'm planning to study the circuitry!

[Serum]

I don't know the name for it anymore, but there are diodes that create a near dead short if they are above their voltage (available in a large variaty) and ara capable of killing quite some power (peaks) and are really fast.

I talked about it with schulze, because of their 'loose contact' issue, but he put his head in the sand, eversince his controller is the most flawless controller available..

my idea was to use them on the motorside and on the battery side. A rather easy mod. but then his 'loose contact' story wouldn't be adequate anymore..

[BrianG]

Yeah, there are several components that do this: MOVs, avalanche diodes, zener diodes, etc. Gotta be careful though, some components (avalanche diodes) actually generate RF noise. Since the motor wires pass AC (I know it's PWM, but it's still AC), maybe a $0.39 MOV would be the best bet. Something with a breakdown rating of about 1.5x the max battery voltage should work fine. And I would just put them across the motor leads since the motor is what creates that back EMF. There isn't anything in the battery side that would benefit so I don't think I'd put anything there.

[Serum]

It had another name, i will check my electronic guru friend..

schulze said that the loose connection from the batteries get the controller on a higher voltage, which causes the all familiar schulze meltdown thinking about it as logical as possible makes me wonder how a motor can produce a certain voltage, higher than the one that was needed to put it on that rpm.. a perpetuum mobilee generator perhaps...

[crazyjr]

Hey Serum. How can Schultze say they're controlers are flawless when they have a "loose connector" problem?

[Sylvester]

Doesnt every company think or atleast say they have flawless products?

[Serum]

Pity schulze is too stubern... I've got a rather large collection of smoked controllers that prove different though..

@brianG, they are called TRANCIL diodes..

[BrianG]

I've never heard of such a thing.Are you sure it's a "Trancil" diode.

[Serum]

no, it's a transil, do a search for them on google.. they are the ones you want to use.