Castle - Make A Special Edition Monster

[suicideneil]

MOnSterFET.....

Ever thought about a sensored esc? Stick a hall sensor do-da like the novaks use on the end of your Castle-Neu motors (it really is that simple, honest ) and hey presto, the holy grail of BL escs and motors = sensored smoothness, zero cogging, locked rotor detection etc etc and a truelly awesome motor to match.

If you build it, we will come!

[lutach]

Kind of what Aveox did back in the days.

[suicideneil]

Yeah, its sad they left the RC game- before my time really, otherwise I might have bought one of their systems to use instead of the hvmaxx. Concidering I paid a barmy £269/ $510 for the system (yes, that much!), I think I could have done alot better, if only I had found RCMonster earlier in my RC career....

[pb4ugo]

Originally Posted by Pdelcast

Well, what I was talking about above was for a 12S design, not 20S. We do have the SHV controller which is good for 20S, but it gets very expensive very quickly to do 20S.

The SHV-250 is 20S, 250A and a BIG footprint (close to 3"x6")

And I'm not kidding about robbing the brain boards -- no zombies here! I don't even like the thought of robbing a brain board 'cause they are soldered down on the power board as a hybrid, and it would really difficult to remove without damaging / destroying it.

I'll be changing the MMM control board design to take it from 26V maximum usable voltage to 54V maximum usable for the MMMM (or 4xM? Mega MAX? M-quad? B.F.E.S.C.?)

That one has my vote!

[Pdelcast]

Originally Posted by suicideneil

MOnSterFET.....

Ever thought about a sensored esc? Stick a hall sensor do-da like the novaks use on the end of your Castle-Neu motors (it really is that simple, honest ) and hey presto, the holy grail of BL escs and motors = sensored smoothness, zero cogging, locked rotor detection etc etc and a truelly awesome motor to match.

If you build it, we will come!

And lower efficiency, lower reliability, inferior locked rotor detection, no automatic timing...

Who's hype have you been listening to?

[Pdelcast]

Originally Posted by pb4ugo

That one has my vote!

B.F.E.S.C -- has a nice ring.

[TexasSP]

Sensored motor setups or great for CNC servo motors (and others that need high precision) but I see no need for RC applications were that kind of precision is pointless. As smooth as the MMM is I see no reason to toss a sensor in their, it is every bit as smooth as the novak ESC's and way more powerful.

[suicideneil]

So much for that idea then...

Smooth can motor per-chance? The fins on the Castle-neu are so small I doubt they do much really?...

[Dagger Thrasher]

I don't know...I bet they're fairly effective actually. Even a "ridged" can like the Castle one can more than double the surface area of the aluminium over a smooth can which will have an effect on operating temp. IMO, it's worth having the ridges. Plus, they look pretty cool too!

[BrianG]

The only place a sensor would be of any help would be extremely slow and/or heavily loaded starts. Once the rotor gets enough rpm to generate suitable back-EMF pulses, the sensors are not needed.

And, as DT said, any increase in surface area is helpful. It's about exposing as much of the motor to air as possible.

[skellyo]

Originally Posted by Pdelcast

B.F.E.S.C -- has a nice ring.

One of our power supply guys here loves the term BFC. Of course, that's usually just something in the 10's of uF in a 270VDC system.

[lxmuff]

Originally Posted by Pdelcast

B.F.E.S.C -- has a nice ring.

I like M^3. The cubed difficulty of the design the bigger they get.

[Arct1k]

Originally Posted by Pdelcast

I have IR pictures of the ESC, and a copper plate doesn't make any significant difference on the 6oz board... the older 4oz board was a different story. And, a copper pin fin heatsink is actually an easier mod will have much more effect than a copper heat spreader.

Is this a potential option for a more expensive MMM that doesn't need a fan? :)

Cheers

Originally Posted by Pdelcast

And lower efficiency, lower reliability, inferior locked rotor detection, no automatic timing...

Who's hype have you been listening to?

What about a hybrid system like the Speed Passion GT ESC? That takes advantage of the sensored starts, but can still do the automatic timing. I never heard of a sensored motor having lower efficiency; if anything, I've noticed that they run cooler for the revs they have to spin (I know they don't put out THAT much power, but they're no slouches- especially once you get into the lower turns).

If someone could put out a sensored system that can deal out the amount of power your guys' system puts out, I think it'd be a hit (screw ROAR... I could care less if it's ROAR legal). I'm pretty happy with my Mamba Max and Medusa setup though.

Methinks I need a CC BEC so I can run 3s happily all day.

[BrianG]

Patrick, I have a little question for you that's a little off-topic. I'm just looking for an "official" opinion from an expert.

The common consensus here seems to shoot for a battery and motor kv setup to get around 30-35k rpm total. This most likely came about because Feigaos tend to heat up at speeds higher than that. However, lower rpm means less EMF pulses at really slow speeds, which increases the chances of cogging.

But, I kinda like running the Neus at higher rpms, say ~50k, and then gear down for the same overall speed. This type of setup seems to run cooler and just better. Doesn't that provide more EMF samples at lower speeds making for smoother starts and low-rpm running?

From an ESC/motor standpoint, which is better? Judging from the kv values of the bundled motors you plan to release, it seems that you are leaning towards the second option.