JKamil

Hi there,

I'm rebuilding a six-wheeled ackerman-rover type robot, to six wheeled rocker-bogie.

The plan is to buy six of these planetary gearboxes /Banebots Planetary 1:104/. Those already contains brushed RS540 motors, but I would like to try something new and incorporate those gearboxes with some BLDC-s.

The RS540 specs are
Stall Torque 39.48 oz-in / 278.8 mN-m
Stall Current 42A
Kt 0.94 oz-in/A / 6.6 mN-m/A
Kv 1400 rpm/

I've done some math, and for the robot of this size and weight I would need have it in gearbox 1:104, and speed will be around 1.2 m/s.

I found some motors with suitable size ( and price ), but there is no sign of Kt parameter. I also contacted support, but it seems that these infos are classified...
These are the chosen motors: ( less than 3.2mm shaft diameter, 540 size, relatively low RPM, no higher max current than 60A )

Option1:

XK4050-2260KV Brushless Inrunner
Specs.
# of poles: 4
Max Amps: 50A
Max Volt: 11.1V
Max Watts: 555W
Rpm/V: 2260kv
Resistance: 0.0185 ohms
No-load Current: 1.1A(7.4V)
Dimension: 39.8mm x 49.8mm
Mounting hole depth: 7mm
Length of extend Shaft: 15mm
Shaft diameter: 3.175mm
Weight: 215g

Option 2:
HobbyKing X-Car 13.5 Turn Sensored Brushless Motor
Specs:
Can Size: 540
Turns: 13.5
RPM/v: 2600kv
Sensored: Yes (Standard 6 pin harness)
Pole: 2
Max voltage: 7.4~14.8v (2S/4S)
Max Current: 19A
Max Watts: 500w
Resistance: 0.0361ohm
No Load Current: 0.6Amp
Shaft Size: 3.175mm
Weight: 167g

Is there way to tell if these motors will be sufficient for my application? I've red some articles that BLDC motors have higher torque in general, but will this work?

Thanks in advnace
Kamil

racer1812

iTrader: (31)

I would think a 21.5 or 25.5 sensored motor would get you specs closest to the RS540 motor.