[Dprglist] Motor Noise Level

Doug Emes dougemes at gmail.com
Fri Jan 22 12:07:26 PST 2021

REV was started by one of our former DPRG members, and a long time
friend Greg Needel.
Consider this a +1 to his company's product offerings.

On Fri, Jan 22, 2021 at 11:22 AM Karim Virani via DPRGlist
<dprglist at lists.dprg.org> wrote:
> We've switched entirely to the REV ultraplanetary system. You didn't really describe the power/torque envelopes you are looking for but our robots are typically 30 to 40 lbs and are fairly zippy even on just two motors. Some teams use up to 4 of these, usually because they have a mecanum drive train, but some might double up motors for maximum acceleration. Here's a video of our differential drive robot on 2 of them. Much of the noise in that video actually comes from the turret.
> The $36 motors are pretty quiet and very versatile. The output can be geared from 1:1 all the way to 143:1 (with the purchase of alternate gear stages). You can stack from 0 to 3 gearbox cartridges (stages) to come up with a 28 different final gear ratios.
> Of the 15 or so of these we have, one has had a bad gearbox. I don't know if it was a bad cartridge or one of my students over torquing the gearbox assembly. They are pretty resistant to burn out under stall conditions.
> The output shaft is 5mm hex which is compatible with 6mm round bearings. Even better, you can mount your driven component without a shaft to the face of the gearbox with M3 bolts where it is supported by a good ball bearing. I still never recommend direct drive for any wheel on a heavy robot, but these can sustain pretty solid axial and transverse loading created by your drive train. They also have a 1/2" hex shaft adapter.
> These are 12 volts. The encoder is shaft mounted, 28 counts per revolution, 6,000 rpm no load. Max power is 15W, stall torque is .105Nm, stall current 8.5A.
> If you want to pay extra for really long life, quieter operation and higher performance at speed, they have a brushless motor option, but that changes your drive electronics substantially. It also doesn't support higher loads, but I'm not sure why. We've used their larger brushless motors but have not used the smaller one compatible with this gear system.
> product page: https://www.revrobotics.com/rev-41-1600/
> video: https://www.youtube.com/watch?v=tmB8c-cCHd8
> manual: https://docs.revrobotics.com/ultraplanetary/
> -karim
> On Fri, Jan 22, 2021 at 9:49 AM Pat Caron via DPRGlist <dprglist at lists.dprg.org> wrote:
>> Hi all, at the last RBNV, there were several comments on how much noise the "Wood Monster" made.  My wife agrees that it is quite noisy.
>> Can anyone recommend a quieter gear motor c/w encoder capable of moving the 30lbs robot?  Presently the motors are powered by a 12V SLA battery and speed at full load is 120 RPM with a ~6 inch wheel.
>> Thanks,
>> ...Pat
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