Question for Patrick

[lutach]

Originally Posted by Sammus

I thought I read somewhere thats how sensorless BL esc's worked (castles in particular) - that the timing varies with the RPM. I also read (in the drivers ed guide maybe? cant remember) that the esc detects the optimum value for the timing, and the timing adjustment just varies it within that optimal range. Does this sound right?

That's what I was about to ask Patrick. I got timing set at high right now and I'll see what happens when I try it out on Monday.

[johnrobholmes]

Yep, the timing is variable on Castle's ESCs. You set the range it stays in, and it automatically adjusts timing based on load and RPM of the motor.

[What's_nitro?]

Originally Posted by johnrobholmes

Yep, the timing is variable on Castle's ESCs. You set the range it stays in, and it automatically adjusts timing based on load and RPM of the motor.

Ahh, I see....and knowing is half the battle!

[lind5]

hi i was wondering about the monster 2200 combo i have seen it on back order with certain shops saying delivery will start the week comencing 25 august but i cant find anything about the combo date on castle web sight
can you tell me if this would be correct or is this shop just teasing me

[lutach]

Originally Posted by lind5

hi i was wondering about the monster 2200 combo i have seen it on back order with certain shops saying delivery will start the week comencing 25 august but i cant find anything about the combo date on castle web sight
can you tell me if this would be correct or is this shop just teasing me

Please look here: http://www.rc-monster.com/forum/showthread.php?t=13919.

[lutach]

Patrick,

Just came back from running the Recoil. I changed the timing from normal to high and it still heats up pretty good. I'm going to try the smallest pinion I can fit in the car and see if temps go down. Motor wasn't as hot as it was with normal timing though.

[crazyjr]

That is strange, it heating up on an average of 3.05 amps. I know the peaks are higher, Just thinking the average would be the culprit. Before the update that allowed us to run Neu motors on mamba's, I seen cog spikes of 120amps on a mamba 25 (on 3s lipo) and it would get warm, but not what i would say was hot. For those that think its too early to do math (saturday as well) that was 1000+watts through the little mamba, tough little buggers

[lutach]

There were a few guys at the track who are racers and couldn't understand why it was getting that hot. I'll wait for Patrick to give an answer of what is the max RPM for a 6 pole motor.

[Pdelcast]

Originally Posted by lutach

There were a few guys at the track who are racers and couldn't understand why it was getting that hot. I'll wait for Patrick to give an answer of what is the max RPM for a 6 pole motor.

It's not the max RPM (commutation limit) that is at issue here. It's the fact that the recirculation currents are continuing (probably) almost all the time -- this is VERY hard on the ESC, as all the body diodes on all the FETs will be conducting for a significant amount of time.

Again, I would be surprised if you can ever get a 6 pole 9200Kv motor working well. That's just not a good idea.



We tested some of the CC Neu motors to destruction the other day, and the MMM had no issues running a 4 pole motor at 150,000 RPM. So commutation frequency maximum isn't the issue here.

Have you tried it with low timing? That might help reduce the recirculation currents somewhat.

But I still don't think a 9200Kv 6 pole is a good idea. 2 pole is pushing it with a 36mm motor and 9200Kv...

[Sammus]

Originally Posted by Pdelcast

We tested some of the CC Neu motors to destruction the other day, and the MMM had no issues running a 4 pole motor at 150,000 RPM.

Sweet, I was planning to aim for that kind of RPM too

On a serious note though, how'd you test that? At a guess you either had a custom super HV version of the MMM, or did a super high Kv custom wind to test with?

[Pdelcast]

Originally Posted by Sammus

Sweet, I was planning to aim for that kind of RPM too

On a serious note though, how'd you test that? At a guess you either had a custom super HV version of the MMM, or did a super high Kv custom wind to test with?

Well, we only hit 150,000 on one of the 2600 Kv (1512) motors, at 56V.

It was an HV.

[ogrfre01]

Will the motors only be avalible as a combo or will they be sold seperatly?

[What's_nitro?]

Roughly how long would you say a Neu could operate for at say 100,000 rpm? I know they are only rated for 60,000, but just once I want to hear what 100,000 rpm sounds like with a big motor. Would one need to upgrade the bearings? Just curious...

[Pdelcast]

OK---

1. Available as combos and alone.

2. HV MMM -- yes, it is coming. Someday. Not real soon.

3. Watch for motor pricing on our website. They were a little more expensive to build than we originally thought.

4. Some of our samples didn't even make 100,000 -- they failed in the 85-90K RPM range. So, I can't recommend ever running the motors over 60K RPM.

Thanx!

[ogrfre01]

Thanks for the reply, is there a pre-order soon on the motors? (I will be getting the 1512 2600kv asap)