Torque and rpm help please

Help & Support Robot Parts
1

I’m looking into a p60 gearbox combined with 550 motor my goal is to have a RPM around 250 and 40-50 in lbs controlled by a esc and servo tester since that seems to be the only option to go wired because I don’t want it remote. Which setup do you think would work best and why duratraxx 550, banebots 550 coupled with the 104:1 or 81:1 p60 gearbox

I found several different motors the 2 I’m looking at are the BaneBots rs550 and Duratraxx 550 Specs below for each. My power supply is 12v 5A. I think that if I used a p60 gearbox 104:1 with the duratraxx 550 My Max RPM should be around 230 RPM(PLZ correct if wrong) but my torque is where I doubt myself I read that nominal torque is usually 1/4 of the stall torque 91.65*.25=22.91 oz-in*104=2382oz-in so my real question is, is my math right would I really get 12.4 ft lbs torque out of that little motor???

1)Duratraxx 550
robotmarketplace.com/products/0-DTXP5737.html
Speed : 24,000 rpm @ 12V
Angular velocity constant: 2000 rpm/V
Amps @ nominal: 1.5 Amps
Efficiency: 45.33%
Peak Power: 0.55 hp
Stall current: 148 A
Stall torque: 91.65 oz-in

2)Model M5-RS550-12
banebots.com/p/M5-RS550-12
Operating v : 6v - 14.4v
Nominal v : 12v
No Load RPM : 19300
No Load A : 1.4A
Stall Torque : 68.85 oz-in 486.2 mN-m
Stall Current : 85A
Kt : 0.81 oz-in/A 5.7 mN-m/A
Kv : 1608 rpm/V
Efficiency : 70%
RPM - Peak Eff : 17000
Torque - Peak Eff : 8.84 oz-in 62.4 mN-m
Current - Peak Eff : 10.9A

2

Thank you thats the kind of useful info I was looking for!!!

3

Would this be sufficient power for the motor 12V@40A and also using the 5VSB@2A for the servo control?
+3.3@20A, +5V@25A, +12V@40A, [email protected], +5VSB@2A
newegg.com/Product/Product.aspx?Item=N82E16817822013

4

So what amps would I need to run the duratraxx?

5

A 12v 5A power supply will not be anywhere close to what either motor needs. The continuous current can be taken as ~1/4 the stall. Therefore for the Duratraxx, the continuous current would be around 37A, whereas for the Banebots it would be 21A. Using a 104:1 you reduce the speed by this factor, and multiply the torque by this factor. Never consider stall, since that burns the motor; always use 1/4 to 1/5 the stall value as being an approximate continuous value.

6

It would be find for the Banebots, and on the low side for the Duratraxx. You can certainly use the 5V for some normal servos. You might find this useful: robotshop.com/en/cytron-atx-power-supply-breakout-board-right-angle.html

7

Since the continuous current is around 40A, your power supply should be capable of supplying at least 60A. Note that does not include spikes, so it’s best to include a 60A fuse just in case. For hobby robotics, when you consider currents like these, people are normally using lead-acid or LiPo battery.