05-20-2019, 02:13 PM | #1261 |
Rock Crawler Join Date: Aug 2015 Location: Fort Knox, Kentucky
Posts: 636
| Re: Have tech questions? Will answer. I'm following. That's why I think if you're running at 0* the motor direction is irrelevant for the application?
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05-20-2019, 04:09 PM | #1262 |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: Have tech questions? Will answer.
Yes, if you have a reverse direction transmission like some axial rigs I think, you simply retard the timing 6* to advance it. If that makes sense. I might be wrong though, it could be you just reverse the wires, but I think it's both. Sent from my SM-N950U using Tapatalk Last edited by Voodoobrew; 05-20-2019 at 04:13 PM. |
05-22-2019, 08:21 PM | #1263 |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: Have tech questions? Will answer. This never got answered, I would like to know as well.
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05-23-2019, 04:39 AM | #1264 |
I wanna be Dave Join Date: Jun 2016 Location: Deep in the Everglades
Posts: 5,818
| Re: Have tech questions? Will answer. |
05-23-2019, 05:58 AM | #1265 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: Have tech questions? Will answer. |
05-23-2019, 06:03 AM | #1266 | ||
I wanna be Dave Join Date: Jun 2016 Location: Deep in the Everglades
Posts: 5,818
| Re: Have tech questions? Will answer. Quote:
Quote: | ||
05-23-2019, 06:08 AM | #1267 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: Have tech questions? Will answer.
Motor torque is linear to length and the square of the diameter (assuming magnetic flux density is not reduced). Fir example, revolver snubnose has 10mm long stator and standard 540 is 20mm stator, standard is twice the power. Comparing a motor with 23mm rotor to 28mm rotor is about 1.5 times the potential torque, assuming rotor didn't displace our ability to cram magnets in.
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05-23-2019, 06:36 AM | #1268 |
Rock Stacker Join Date: Jan 2018 Location: Sulawesi
Posts: 53
| Re: Have tech questions? Will answer.
Thanks for the information, John. One more question. Would the 540 Magnum be suitable for a TRX-4 with a 9T pinion on 3S? Sent from my LG-H870DS using Tapatalk |
05-23-2019, 01:28 PM | #1269 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: Have tech questions? Will answer.
Yes, seems to handle the trx just fine.
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05-23-2019, 05:55 PM | #1270 |
Rock Stacker Join Date: Jan 2018 Location: Sulawesi
Posts: 53
| Re: Have tech questions? Will answer.
I have pored over the various brushed motor options and the higher price of the Magnum has always stood out. IME you tend to get what you pay for (your Revolver motor seems to be an exception to the rule, how do you manage to produce it with all those poles and magnets at that low price? ) from reputable dealers so the Magnum has always intrigued me. It is also the only motor on your site that the typical startup RPM is quoted on. Is the Magnum noticeably smoother than the "normal" Crawlmaster? Sent from my LG-H870DS using Tapatalk |
05-24-2019, 08:42 AM | #1271 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: Have tech questions? Will answer.
The normal cralwmaster is still a little smoother than the magnum version. But the magnum has an incredible amount of power and drag brake without weighing more. It's high cost is due to the additional cost of materials and time of manufacturing. The magnum also has custom armature tooling for the stacking process, which was costly to manufacture. The revolver is assembled in china, thus the lower cost. We could fully wind and assemble them in house too, but they would not be cost effective. Would have to retail well over $200. The biggest pain of assembling outrunners from scratch is the rotor. Just a lot of tooling and time compared to other topologies. |
05-24-2019, 11:50 AM | #1272 | |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: Have tech questions? Will answer. Quote:
and the 550 ver would be (23*23)29=15,341 torque potential? and the 540 ver would be (23*23)22=11,638 torque potential? Meaning the magnum should have 12% more torque than the 550 and 32% more torque then the 540 wet magnet variants of the same motor? Last edited by Voodoobrew; 05-24-2019 at 11:55 AM. | |
05-25-2019, 07:35 AM | #1273 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: Have tech questions? Will answer.
In theory, yes. The brushes are still a choke point but the comparisons are good general guidelines of motor potential.
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05-25-2019, 03:06 PM | #1274 |
Quarry Creeper Join Date: Mar 2007 Location: Celina TN.
Posts: 452
| Re: Have tech questions? Will answer.
Have a radio question. Im trying to find out if a new SR515 reciever will bind with an older DX4C?
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05-25-2019, 03:10 PM | #1275 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: Have tech questions? Will answer.
I dont know about that. I dont keep up on radios much.
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05-25-2019, 04:02 PM | #1276 | |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: Have tech questions? Will answer. Quote:
But personally I would go for the Spektrum SR415 if you can find it, because in spektrums infinite wisdom they decided not to make their new receivers water resistant... normally it's the same price, but this unknown site has it for cheap https://www.zodbuy.com/ oddly enough there is a youtube video that's an hour old saying the site is not trustworthy so I'm listing it as a place not to buy from. | |
05-25-2019, 11:18 PM | #1277 |
Rock Stacker Join Date: Jan 2018 Location: Sulawesi
Posts: 53
| Re: Have tech questions? Will answer.
Hi John, thanks for the replies, it gives me a better idea of the difference between the Magnums and "standard" Crawlmaster motors. One other question I put out a few months back that didn't get answered concerned stand-up versus lay-down brush styles. Stand-up would have slightly less "dwell" and overlap, particularly on 5 pole motors compared to lay-down, how does this affect motor performance and start-up? Which style gives more back EMF and how does back EMF affect motor performance? How do ESCs handle back EMF? Does it have any useful effect on drag brakes? Sent from my LG-H870DS using Tapatalk |
05-26-2019, 03:45 AM | #1278 |
RCC Addict Join Date: Nov 2010 Location: England
Posts: 1,603
| Re: Have tech questions? Will answer.
@offroad911. The SR515 is DSMR and DSM2 capable. https://www.spektrumrc.com/Products/...rodID=SPMSR515 The DX4C is DSMR, so should work ok. https://www.spektrumrc.com/Products/...rodID=SPMSR515 But as Voodoobrew says, you are probaly better with the SR415 or any DSMR rx. |
05-26-2019, 10:53 AM | #1279 |
I wanna be Dave Join Date: Jun 2017 Location: Humboldt county
Posts: 4,482
| Re: Have tech questions? Will answer.
I cant find the old generation of the Spektrum receivers so I've settled for the new version and have used the Holmes Hobbies Conformal Coating on them. Its an easy board to coat just give yourself some extra time to let it dry. Also binding first is helpful since the button used to bind becomes a bit harder to push when put back in its case, or use your fingernail to push it while out of the case. https://holmeshobbies.com/featured-p...l-coating.html |
05-28-2019, 08:42 PM | #1280 |
Rock Stacker Join Date: Jan 2018 Location: Sulawesi
Posts: 53
| Re: Have tech questions? Will answer.
Does the direction of rotation, forward or reverse, have any effect on skewed armature motors? Sent from my LG-H870DS using Tapatalk |
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