Cant we do this?

[Xfactor]

peace

[ED66677]

two ESC's in parallel will go boom for sure, I've been thinking, as you did, to disassemble two ESC's and use the power blocks to double the available amp but not sure if one "control stage" can do the job correctly???

[BHChieftain]

two ESC's in parallel will go boom for sure, I've been thinking, as you did, to disassemble two ESC's and use the power blocks to double the available amp but not sure if one "control stage" can do the job correctly???

I think this is how the hydra 240 ESC is built-- it appears to be two 120 ESCs glued together, even has dual sets of input and output wires (which need to be manually soldered together by the user). The instructions make it clear however not to run the batteries independently into the two "halves"-- need to blend the power inputs.

??

-Chief

[AndyKunz]

I wouldn't waste two ESCs. Boom is virtually guaranteed.

Unless it's specifically designed for parallel output, an ESC needs to be driving the outputs exclusively. You can parallel more output boards, but you can't parallel the input (micro) portion.

At my previous employer (tdipower.com) we made power conversion modules. AC-DC rectifiers (ie, switching BECs) could be paralleled quite easily. DC-AC (BL ESC equivalent) inverters had a communication bus in order to be able to parallel them. Essentially, you ended up with one master that drove everything and a bunch of slaves doing the same thing at the same time. It got ugly REAL QUICK if they weren't synchronized.

Andy

[AndyKunz]

Depends on the topology of the power sections you are using. You may need to boost the signals feeding the second board of FETs. The analog coming back would be fine. If the ESC has current measurement, you might run into problems there.

Save yourself money - buy the right ESC to begin with.

Andy

[ED66677]

get a pair of cheap 80A Mystery and see if you can pull 160A out of it... I have some and I could do the test but I'm not interrested in waisting $40, that's what I paid for them!

[Fluid]

Thanks i do that all the time but I still want to experiment thanks for the help.

Why are you asking for such basic information here? I thought you where working with the Dean of the Electronics Department of a major university who is mentoring you on how to build a cheap, 300+Amp ESC???



.

[domwilson]

Don't know if the back EMF will be enough for the ESC's to sense if in parallel. In addition, if the ESC's are slightly out of sync on the output, With multiple pulses overlapping, this could lead to a high current DC component and burn up a motor.

[AndyKunz]

Dom,

It will be plenty. The input is a high impedance, so there is very little change to the signal level seen by both ESCs. The problem is that they need to be perfectly synchronized (within a few us) so that they are both driving the FETs at the same time. That, quite simply, isn't going to happen. The alternative is to remove the micro from one ESC, and have it's outputs driven by the other micro. This is exactly how I built the dual-90 ESCs several years ago (I only made a handful - those who have them might chime in).

And Mr. X: Your signature is appropriate, if you look in the mirror. "Ego leads to self destruction. " If you knew who it is that you were railing against, you might not be so inflated. Here's somebody who has been a positive contributor to the hobby for 20+ years, somebody who has set multiple records in some of the toughest classes, and you go dissing him?!?! Wake up, dude.

Andy

[Rumdog]

Once again, please leave my names out of your posts, Mr arrogance.

[Gary]

Now look what you guys gone and done!!!!!!!!!!!!!!!!!!!!!

[sailr]

I started a project two years ago with a noted esc designer to do just this, two power blocks and one 'brain'. We abandoned the project after several failures. I don't remember the problems just now but I took his word for it.

two ESC's in parallel will go boom for sure, I've been thinking, as you did, to disassemble two ESC's and use the power blocks to double the available amp but not sure if one "control stage" can do the job correctly???

[AndyKunz]

Now look what you guys gone and done!!!!!!!!!!!!!!!!!!!!!

ROFL! He must be new to forums, otherwise he'd know to include a quote so people know who he's replying to. I have this picture in my brain of Bugs Bunny saying something like, "Whatta maroon!"

Andy

[m4a1usr]

I started a project two years ago with a noted esc designer to do just this, two power blocks and one 'brain'. We abandoned the project after several failures. I don't remember the problems just now but I took his word for it.

Do you remember if it was one of the cheapo chi speedos or a name brand? I know Ray is working on stacking power boards on one of the 200 amp cheapies but I dont think he's had time to complete the project yet. Its tempting to play with on first thought.

Andy, I dont think too many of these cheapo's we have been buying are going to have current sense circuitry (if thats what you where reffering to earlier) so I'm going to go out on a limb and assume that the biggest issue might be the driver voltage level being high enough as more FET's come into the circuit?

I have been studying the speedos I have with stacked boards now and the HexTronic 120 only have an addition 6 solder joints (not power or output) and 2 of those connections appear to be for board integrity (structural) not electrical connectivity. The MGM's I have with stacked FET boards have 8 extra connections but I know these guys have a current measurement circuitry. The rest of the guys I have you cant see nothing unless you break out the soldering iron.

You and I go back half a dozen years (and I appreciate you taking the time to over the years for edjamacating me!) and I would like to hear your comments/ thoughts/worrys/concerns on attempting this sort of garage sperament'n. Not that I'm worried about thowing away 100 bux, its being lulled into a false sense of how easy this might appear, yet be far more complex. Oh yeah. I'm solder certified as well as ESD trained and I have the tools at work so disregard the garage comment. Just slang.

John

[sailr]

It was chinese but not one of the cheapies. The guy is absolutely brilliant. He was the FIRST to have telemetry built in to the esc (like castle does now on the ICE controllers) I OEM'd aircraft controllers from him and the quality was the best I have ever seen from anyone, anywhere. The company is hifei. They make the Seaking controllers. Rock solid stuff. After a while, he got so busy he and I just kinda gave up on the single controller for two motors. If you ever work it out, let me know. I'll get him to build them!