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Old 06-07-2013, 02:20 PM   #1
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Default 4s capable 4 pole 1/8" shaft sensored motor?

I'm creating a monster (bwah hah hah). I have 4wd Himoto buggy,cc sv2, castle 1406 4600kv, on short course wheels... Its a blast on 3s but it gets hot quick... Now I have a MMP on its way soooo... What 540 can motor will handle 4s or even 6s with 4 poles (torque) an 1/8" shaft and sensored would be great since I imagine I'll want to stay light on the throttle most of the time. I'm still kind of a newb so please let me know if I'm wrong, or in for trouble. I'm a Basher.
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Old 06-07-2013, 02:26 PM   #2
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Quote:
Originally Posted by punkypop View Post
I'm creating a monster (bwah hah hah). I have 4wd Himoto buggy,cc sv2, castle 1406 4600kv, on short course wheels... Its a blast on 3s but it gets hot quick... Now I have a MMP on its way soooo... What 540 can motor will handle 4s or even 6s with 4 poles (torque) an 1/8" shaft and sensored would be great since I imagine I'll want to stay light on the throttle most of the time. I'm still kind of a newb so please let me know if I'm wrong, or in for trouble. I'm a Basher.
Well.. tekin just released some new pro4 (old ones) motors. They have a 2400, 1900, and 1400kv. First two up to 4s and last one up to 6s. Pretty sure they have 5mm shafts but they make a rotor with a 1/8" shaft. Not sure what else is out there.
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Old 06-07-2013, 03:32 PM   #3
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Tekin ROC 412 meets all the criteria. I run the 1200kv version in my Stadium Truck on 6s. It's fantastic.

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Old 06-07-2013, 08:24 PM   #4
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Default roc 412

1200Kv(x14.8v=17760rpm) ROC 412 is a crawler motor, I want more speed than that. After doing the math my cc 4600Kv(x14.8v=68060rpm) which is well within the 100,000rpm limit on the can. Anyone know how accurate that is?
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Old 06-07-2013, 09:58 PM   #5
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Yeah you typically dont wanna get your motor over 40,000. Couple of reasons.

1- Your motor bearings arent made to withstand that high of rpms. You will fry the cages in no time, chances are theyre probably getting loose already.

2- Your rotor has a huge mass in the center of it. When you spin it fast it exponentially multiplies the heavy side of it. It may be pefectly balanced at 10000, but at 35000 it starts to throw the heavier side out even tho it only weighs .00001oz more than the other side. The fore of rotation throws it arounf at .05oz, even more so at higher speeds.

Youre mostly asking for trouble.
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Old 06-08-2013, 04:49 AM   #6
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Default Hmm..

Everything I've seen and read put REASONABLE limits at 50,000-60,000... I knew 68K was pushing thats why I asked for the motor advice. 40,000 though?? 20%-35% drop there from what I was thinking 4s would only be for speed runs occasionally, I kinda want to hit 100mph,
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Old 06-08-2013, 11:34 AM   #7
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You could possibly do over 50k rpm on a motor if it is rated for those kinds of speeds. Otherwise 40k should be considered the safe limit because of the wear on the bearings.

Using a high torque motor and gearing it to the sky is another approach. Either way is going to stress your system though.
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Old 06-08-2013, 12:03 PM   #8
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Smile 100,000 rpm max??

How could they put 100,000 rpm max on the can if it wasn't at least 70% true? Anyway, gearing is still to be mentioned. I want to get the MMP in it, check temps, adjust gearing, etc. I'd like to hit 100mph.. eventually. Ultimately, this is the monster RC created. I could add wings.....How well do brushless work in outer space?
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