Cant we do this?

[m4a1usr]

After you get that ESC going, you can use this...

http://www.plettenberg-motoren.com/U...or37/motor.htm

That is an awesome motor. I used to have a url saved of a web site where a guy was using that motor and lipos for a powered paraglider. The videos where fantastic. The guy would take 6, maybe 8 steps an off into the wild blue he would go. That motor has also been used for bikes and solar powered vehicle projects. A monster!

John

[Xfactor]

Yeah 25kw a 33 horse hog. Whats the price though?

[AndyKunz]

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?

If the ESC design is good, the micro outputs will be buffered to provide adequate drive to the FETs using a FET driver chip. These have high impedance, so there shouldn't be any issue driving the FETs.

If they cheated to save a few cents, all bets are off.

Andy

[ED66677]

anyone ready to sacrify a pair of ESC's to perform the test?... I think I'm going to do it... got to find a cheap motor to connect to it, don't want to blow my Feigao!

[Xfactor]

I have two efly hv 45 amps hv is 6s on these . The power blocks are burnt but I will repair then try. Unless its modular u will need a good desoldering tool so you wont break the traces.the esc is more likely to fail than the motor. To be honest I think u will be fine just make sure the connections are right and solid. And everything is parallel rite. The bat connectors for each power block and the phases aa bb cc . This is the plan rite?

[Xfactor]

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

I think regaurdless of price they do have current sensing the sensorless designs are dependent on that.

[RandyatBBY]

This is interesting, isn't stacking boards what Castle has done for ever? I have always wandered how they do it. I wanted to make a 360 hydra.

This tread started out great. Then Jay asked a question and it went to hell for a while. If you are working on a cheap 300amp ESC great! I am using the cheap M- 2000 and I still have not pushed it too hard for fear of losing 189 bucks. Andy, Jay and Xfactor you all are on another level than I on electronics. But I get the jist for what you all are saying.

[AndyKunz]

I think regaurdless of price they do have current sensing the sensorless designs are dependent on that.

Wrong!

There is no reason to include current sensing unless you want it for a specific purpose (storing values like the Ice series, to prevent an over-current condition, etc.). Commutation is performed based upon the voltage of the non-driven motor lead, and timing since the last change. Nothing else.

Andy

[Xfactor]

thanks for clearing that up lol

[Xfactor]

Let me ask you this. At what point of adding fets do i need to worry about driving up the gate capacitance to where I need to consider a different driver. Also if im understanding rite we could do what they do to us and simply identify the fets reverse engineer the traces and simply use pcb sofware to desing a powerblock with more fets and caps build it and run it with the existing logic board?Go team xerox and basically copy it.

[Xfactor]

Do you have anything in your goody chest that will supply 30 volts @ 100 amps contiuous to a brushed motor.

[Xfactor]

This is interesting, isn't stacking boards what Castle has done for ever? I have always wandered how they do it. I wanted to make a 360 hydra.

This tread started out great. Then Jay asked a question and it went to hell for a while. If you are working on a cheap 300amp ESC great! I am using the cheap M- 2000 and I still have not pushed it too hard for fear of losing 189 bucks. Andy, Jay and Xfactor you all are on another level than I on electronics. But I get the jist for what you all are saying.

Randy were not on your level period. I truly think you mite be the boat king on ose boy u build alot of boats.I really wish youd get back on that screamer proboat for me.

[AndyKunz]

Can you please edit your posts so we know who you're talking to? It's much simpler if, when you read a thread and want to reply, that you click on the "QUOTE" button in the bottom right corner of the box around that message. It will make it so others know what you're talking about and to whom you are addressing your questions and why.

THanks.

Andy

[Xfactor]

Im gonna start another esc thread and I hope and pray that the haters and bad "attituders" stay away please please please.If u got a negative energy please just stay away from me cause the devil is a liar.

[Xfactor]

How many good thread can one start and get ruined by those that really just want to sell their crap?