Am I going to have heat issues on a Crawlmaster 550 10t?

[Voodoobrew]

I have read that under-gearing and different diff gearing can cause excessive heat in motors, specifically in the Crawlmaster 13t.

I am currently running a Trail Master sport 550 27t motor and looking to upgrade.
90c SMC 4500mah batteries
ESC is a Hobbywing wp 1080 but am willing to but a new one if it means better low end, smoother startup, cooler runnung, ect...
Sterring servo powered from battery not ESC.
My rig is 3d printed, but basically a wraith with different demensions.
Vehicle weight is roughly 8.2 lbs with a battery installed.
I run underdrive gears in rear, stock gears in front.
My current Final drive ratio is 91.73/1 but am considering new axles that will lower the FDR in the future to 104.00/1.

I drive in pretty rocky granite boulder terrain so the top speed is mostly to bump over some steep spots or when high centered. Not much smooth ground for going full throttle, but might do some faster driving through easer section to get back the my 1:1 car 10min or 500yards.

I have never noticed heat on my Trailmaster but I want to make sure.
I am looking for the slowest startup and low end I can get 1st and top end second. I don't think at this gearing torque will be an issue.
I think I have decided on the Crawlmaster Pro 550 10t, but want to triple check it should be fine.

160f is a can reading. The temperature rating of Pro motor internals is 400f, and sport and expert crawlmasters are 350f. The shaft is also a good point to read, but since it is reflective you may not get proper readings.
You can have extra heat on a motor that is undergeared, if it spins too fast for the materials used. I doubt that is your problem, but it would be great for your own knowledge to test slightly higher gearing and see how the system responds.

the scx10 in question was 62:1

I learned that the hard way lol. My original CrawlMaster was also 13T set at 6* timing on 3s.

What I failed to do was taking into consideration how much my Wraith at the time weighed. Sure I wasn't full throttle more than a couple of seconds tops but what really over heated the motor was weight of the rig.

Answered:

You will be just fine. Over revving a brushed motor is a pretty special scenario. If your TrailMaster sport does fine now, a Pro will do even better.

 

[Teng]

I used to put a K_type thermocouple on the motor to ensure the true accurate temperatures reading, thus I know how to fine tune my rig correctly. Thermocouple is so useful worth for trying. "thumbsup"

 

[Voodoobrew]

I do have the dx5r paired to it. So that's an option. How is the thermocouple attached to get internal Temps?

 

[Teng]

Hi, I just uses this special tape to stick the cable on the motor( Sorry but I don't know how to called it) This tape also used on my espresso machine to measure the brew group temperature. I hope this help. Cheers

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[Voodoobrew]

Thanks tor the tip Teng. That's good to know.

But since I haven't made the motor purchase yet I'm looking for how likly it is to over heat in this scenario or if it is a poor motor choice for my needs.

 

[HumboldtEF]

I can say that in my heavy 9-ish lb TRX4 the Crawlmaster 550 12T stays cool even when using 2nd gear (9T pinion running 3S), but I also live in a cool area mid 60 degrees most of the time. I also use that motor (I forget how many turns) in a Gmade Gom which also has a 2 speed but it has stayed cool as well.

I've had experience overheating a motor in a Wraith but it was a 540 size. I struggled for a while looking for a motor that wouldnt overheat with the Wraith 2 speed and I ended up going brushless even though I would have much preferred a brushed motor. This was all while I was a noob though and I never did try a 550 size motor, I'd definitely do it differently now.

 

[Teng]

In my opinion, ( I have had my Wraith more than 3 year ) brushless is the best choice for heavy rig like bomber and wraith."thumbsup"

 

[Voodoobrew]

I thought about brushless but this is how I drive https://youtu.be/UCwjHNRoGoQ I would think the brushed would be better here.

 

[Teng]

Nice video. I would say, no brusless motor can compare the smoothness of good brushed motor like Holmes Hobbies ( I owned their brushed motor and loved mine) the smoothness and good drag brake control. Enjoy your crawling fun every day. Cheers [emoji4][emoji106]

I thought about brushless but this is how I drive https://youtu.be/UCwjHNRoGoQ I would think the brushed would be better here.

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[Voodoobrew]

Thanks, you as well.

 

[svt923]

I thought about brushless but this is how I drive https://youtu.be/UCwjHNRoGoQ I would think the brushed would be better here.

Yeah, that's not anything a good brushless motor can't do.

Very few of my trucks run brushed motors and never do I find myself wishing for more low speed control or smoother power delivery.

 

[Voodoobrew]

Right, a good brushless. But any brushed motor can do it... So. I am overly critical of the weakness of brushless motors. But specifically I want smooth start and minimal startup rpms.
I posted a video of my kids scx10 2 slow crawling in the video section. And I want to go slower than that in my rig.

Just because.

 

[JohnRobHolmes]

You will be just fine. Over revving a brushed motor is a pretty special scenario. If your TrailMaster sport does fine now, a Pro will do even better.

 

[Voodoobrew]

I accidentally ordered the wrong rotation. Well, I purposely ordered Reverse (CW) out of ignorance, because I didn't read Reverse is (CW) and I need CCW. But the difference is just the direction of the timing in guessing? When I looked at cans and armatures in the parts they weren't directional. So I am guessing the magnets aren't cut differently on the leading and trailing edges.

So all I need to do is move the timing back 12°, 6° past center?
You guys shipped it too fast , I ordered it at 3am and by 9am pst it was out the door...

 

[HumboldtEF]

yeah its just a matter of rotating the end bell (top)

From HH site
"Brushed DC motors are direct current affairs. If you install you motor and it runs backwards, you have several options. If your motor timing is at 0°, you can simply reverse the motor leads to get reverse operation. You can also rotate the endbell 180° to do the same, and this way, the color coding remains the same for convenience. If you are using timing advance, things are a little bit trickier (but not too much!). Checkout the article on Motor Timing."

https://holmeshobbies.com/faq-troubleshooting