What is this BS Castle is feeding this customer?

[BrianG]

Originally Posted by lutach

Is there any way to overcome this issue with the ripple current?

The only way I can think of is more capacitance. But it gets physically difficult to mount more so near where they need to go...

[Just go Play]

Ok this has me curious enough I have to ask. Is this issue with the ripple current actually something new or would this have also been an issue for guys that have been running big BL motors on the Mamba Max if they used under powered batteries?

My guess is that the "hard limits" on battery specs is more a liability thing that prevents the new rc'r from buying an el cheapo pack at the LHS along with his new MM and smoking it the first time out. (And no I don't expect Joe or Patrick to actually comment on this one way or the other)

[rcmonkey]

Originally Posted by Joe Ford

100% correct...I'm one of those pylon guys...100A continuous plus in my F5D's...the batteries get about 10 cycles and then I throw them away. Same for the F5B guys. :)

For "getting away with batteries that handle less than 75A", NO, DO NOT DO THIS. If the controller fails due to ripple current we can't cover it under warranty, and you may lose your batteries in the process. Better to buy expensive, buy once.

Hmmm I have just seen your post, will 1p A123 packs work?

[lutach]

Originally Posted by BrianG

The only way I can think of is more capacitance. But it gets physically difficult to mount more so near where they need to go...

Cool, that's what I thought, but needed to be sure. That works for me then. Thank you Brian.

[What's_nitro?]

We all knew the modders would get a hold of it eventually! Let us know how it turns out, lutach!

[lutach]

Originally Posted by What's_nitro?

We all knew the modders would get a hold of it eventually! Let us know how it turns out, lutach!

I ran some ideas by Artur (griffinRU) and he thought it wasn't a good idea, but I'm seeing a some different things out there that looks similar, but mine will be for higher voltage. I even had some companies hold the samples, but I might get them and try it out. I also have another idea that will be absolutely amazing if it works out.

[skellyo]

Ok Castle guys, explain to me how guys are killing the internal BEC with "poor batteries".

http://www.rctech.net/forum/showpost...5&postcount=22

As Quoted by RURC on RCTECH.net:

"Castle just called me at 1:10 on Wed the 14 of May. It seems that my thought on magnetic field collapse causing a voltage spike are correct. For the internal BEC problem. Also I have been confirmed that poor batteries are also to blame. As I was told the BEC problem is going to show itself within the first like 10 minutes of usage generally. If you dont have a problem dont send it in, it will be returned to you. The future of this problem will be take care of at Castle. As I understand it there will be a upgraded component installed to prevent this from happening. But like I said if yours is working it should be fine. Again they told me that this problem should show itself within the first 10 minutes."

And why the heck are you guys calling someone that doesn't even have a MMM to explain to them what problems you've seen? I'd really like to know if you have this guy on payroll as a contractor?

[nativepaul]

Is the default switching frequency higher than the MM? I'm no EE but I think that if you raise the switching frequency you need to either lower the inductance or fit bigger capacitors, you can lower the batteries inductance a little by shortening the ESC-Battery leads and using nice fat cable.

[BrianG]

Can't really raise the switching frequency too much for a couple reasons; FETs may not have the slew rate to support higher frequencies, and motor inductance can play a big role as to how effective this would be.

Back-EMF voltage spikes can certainly cause issues with possibly more sensitive components of the BEC. But I would think that as long as these spikes are at or under the 6s-7s limit, it should be fine. So, why not install a transorb, diode, or whatever to clamp the spikes at no higher than say 30v. That would give some headroom for 18 NiMH cells (because they can peak as high as ~1.5v right after a charge), yet shunt potentially damaging spikes to ground protecting the BEC circuits.

Makes me think Castle should have just made the MMM an Opto ESC, or put a circuit based off the typical LM2596 IC (which has a 40v and 3A rating)....

[xtremelimits285]

Originally Posted by skellyo

Ok Castle guys, explain to me how guys are killing the internal BEC with "poor batteries".

http://www.rctech.net/forum/showpost...5&postcount=22

As Quoted by RURC on RCTECH.net:

"Castle just called me at 1:10 on Wed the 14 of May. It seems that my thought on magnetic field collapse causing a voltage spike are correct. For the internal BEC problem. Also I have been confirmed that poor batteries are also to blame. As I was told the BEC problem is going to show itself within the first like 10 minutes of usage generally. If you dont have a problem dont send it in, it will be returned to you. The future of this problem will be take care of at Castle. As I understand it there will be a upgraded component installed to prevent this from happening. But like I said if yours is working it should be fine. Again they told me that this problem should show itself within the first 10 minutes."

And why the heck are you guys calling someone that doesn't even have a MMM to explain to them what problems you've seen? I'd really like to know if you have this guy on payroll as a contractor?

DITTO THAT RURC guy is full of Crap, he thinks hes GOD ....
he said hes been into 1/8th scale brushless for over 10 or 15year
(when we all know 1/8th scale brushless just sarted a few years ago, an just started to cartch on last year)

he thinks he knows everything, AND KEEPS SAYING TO PEOPLE U NEED BETTER LIPOS one that can handle 200amps cont. he saying thats EVERYONES problem for the MMM BLOWING UP(cus the esc need 200amps cont. any battery less will KILL THE ESC)



i dont comet to this guy i just ignore him.
HE REALLY MADE A MESS OF THE BIG THREAD AT RCTECH.COM

(ive been on that thread for almost a year/since i built my electric 8T , its been the best thread but the past few days he made junk of it... i hope he stops his BS cus that thread isc the most informitive for Brushless 1/8th cale conversions)

[lutach]

Originally Posted by xtremelimits285

DITTO THAT RURC guy is full of Crap, he thinks hes GOD ....
he said hes been into 1/8th scale brushless for over 10 or 15year
(when we all know 1/8th scale brushless just sarted a few years ago, an just started to cartch on last year)

he thinks he knows everything, AND KEEPS SAYING TO PEOPLE U NEED BETTER LIPOS one that can handle 200amps cont. he saying thats EVERYONES problem for the MMM BLOWING UP(cus the esc need 200amps cont. any battery less will KILL THE ESC)



i dont comet to this guy i just ignore him.
HE REALLY MADE A MESS OF THE BIG THREAD AT RCTECH.COM

(ive been on that thread for almost a year/since i built my electric 8T , its been the best thread but the past few days he made junk of it... i hope he stops his BS cus that thread isc the most informitive for Brushless 1/8th cale conversions)

He will. I like how he's ignoring me there . (300A Schulze, I can't get that out of my head).

[BrianG]

Do the other people at that forum know he's full of BS? It would suck if people go out and buy lipos capable of 200A just on his word... unless of course he's the one selling them!

I can understand lesser lipos, having higher resistance, allow higher ripple currents to get to the BEC. But, that just means the lipos were poorly chosen for the application to begin with even if the BEC survives. But to say your lipos need to be capable of whatever the ESC is capable of in a blanket statement is just plain ridiculous. Of course, it won't hurt to do that, but it's just not needed in all but the most severe setups. And since the MMM can really handle bursts well over 200A, does that mean the batteries do too? Without reading mr RURC's posts, it sounds like he knows just enough to sound knowledgable and is convincing others as well. Sounds like Mr Patrick should go over there and set this guy straight...

Again, just give us an Opto MMM and be done with the whole BEC thing.

[xtremelimits285]

Originally Posted by lutach

He will. I like how he's ignoring me there . (300A Schulze, I can't get that out of my head).

i seen that u asked him like 3time.....
can i see pics of ur 300A sesc?

he screewd a nice info thread now well have 5-10pages(hope not more) of crapolla

[nativepaul]

Brian, I was trying to suggest that lowering its frequency may decrease its reliance on low induction batteries.

[xtremelimits285]

Originally Posted by BrianG

Do the other people at that forum know he's full of BS? It would suck if people go out and buy lipos capable of 200A just on his word... unless of course he's the one selling them!

I can understand lesser lipos, having higher resistance, allow higher ripple currents to get to the BEC. But, that just means the lipos were poorly chosen for the application to begin with even if the BEC survives. But to say your lipos need to be capable of whatever the ESC is capable of in a blanket statement is just plain ridiculous. Of course, it won't hurt to do that, but it's just not needed in all but the most severe setups. And since the MMM can really handle bursts well over 200A, does that mean the batteries do too? Without reading mr RURC's posts, it sounds like he knows just enough to sound knowledgable and is convincing others as well.

Again, just give us an Opto MMM and be done with the whole BEC thing.

yeah in a post he said only to buy this one brand(forgot)
i think he works for them...