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Omron mini gearmotor (R2DG-41) detailed data
All the data that's fit to print



Manufacturer
Omron

Source
All Electronics #DCM-110

picture

Comments
These motors need to be "hacked" just a bit before you use them on a robot. I just cut all the wires where they connect to the circuit board, chuck the little connector with its 3 wires into my "parts bin," and then connect power to the two (red & black) motor leads.

For CW rotation (facing the white output gear, with the metal "nub" pointing at you), connect the red wire to positive voltage, and black to negative (or ground). For CCW rotation, just reverse this polarity.

These motors are small, but "noisy" (in an electrical sense), and relatively inefficient. I'd suggest you use them in place of servos on battery-powered 'bots, with a parallel capacitor to help deal with the noise they put out. Also note that the gearhead contains a worm gear, so these motors aren't useable in any bot that makes use of motor feedback for position limiting (namely, most Nv net walkers).

This page presents all the data from my testing of one example of the Omron R2DG-41 mini gear motor available for $4.25 (US) from All Electronics. The test procedure I used is described in detail elsewhere.

I tested a single example of this motor with only minimal modifications (disconnected wiring from circuit board, powered motor directly).

Voltage

No-load Current (mA)

No-load Speed (deg/sec)

Efficiency (deg / mW-sec)

0.5
46.1
0
0
1.05
112.5
0
0
1.05
75.7
19.85
0.2497
2.0
77.6
70.07
0.4515
2.5
80.75
95.74
0.4743
3
82.9
119.21
0.4793
3.5
83.45
146.34
0.5010
4
84.55
171.76
0.5079
4.5
83.1
198.79
0.5316
5.0
83.55
224.02
0.5363

Omron mini current vs. voltage

Omron mini speed vs. voltage

Omron mini efficiency vs. voltage


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Page author: Eric Seale
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