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The Solarbotics GM12a, GM13a, GM14a, and GM18
gearmotors are compact, high-quality motors with metal gears.
The first three motors in the series are very similar to the Sanyo NA2S,
NA3S, and NA4S, respectively. The major difference is that these Sanyo
motor look-a-likes have brass front faceplates (not steel ones), and
they cost less!
These miniature metal gear motors have 3-mm
diameter output shafts that mate fairly well with any 1/8" hole
output device, including the Solarbotics RW2
high-traction rubber wheels. The brass faceplates have two mounting
holes threaded for 1.7 (dia) x 0.35 (mm/thd) x 4mm long screws
(M1.7 x 4 mm).
These small motors come in a variety of gear
ratios, have a compact size (1.14" x 0.39" x 0.47"), and
weigh only 0.29 oz, making them a great choice for small robot
designs — and controling these low-current motors is a snap
with our micro dual serial motor controller.
Specs for the mini metal gearmotors running at 6V:
| gear motor |
gear ratio |
free-run RPM |
free-run current |
stall current |
stall torque |
| GM18 |
30:1 |
1350 |
145 mA |
480 mA |
2.00 oz*in |
| GM12a |
100:1 |
170 |
48 mA |
390 mA |
10.70 oz*in |
| GM13a |
150:1 |
113 |
40 mA |
370 mA |
14.97 oz*in |
| GM14a |
298:1 |
71 |
50 mA |
533 mA |
30.70 oz*in |
| Note: These gearmotors do not come with
mounting hardware, instructions, or packaging. The brass
faceplate has two mounting holes threaded for 1.7 (dia) x
0.35 (mm/thd) x 4mm long screws (M1.7 x 4 mm). |
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