Small Motors

Want to build something itty bitty?

Try these: just

• 4mm (0.158") diameter
• overall length of 16.4mm (0.65")
• output shaft diameter of 0.66mm (0.026").

This 030 form-factor motor with precious-metal brushes offers pretty good performance for a flat-sided motor.

Offering 7400 rpm @ 4.7V, drawing 150mA and giving 4 gm*cm torque (17 @ stall).

This is the standard motor that is built in to the GM2/3/8/9.

It nominally runs at 6VDC and consumes roughly 35mA.

Now includes a plastic pinion gear that fits onto the output shaft.

This model differs from the GM2 in that it has a 90 degree output shaft.

This motor offers 50 in.oz of torque, rotating 360 degrees every 1.6 seconds (38 rpm - just a hair slower than a servo), at 5V, drawing 600mA at stall (free running at 52mA).

This gear motor starts rotation at 0.58 volts, turning 7RPM drawing only 46.5mA.

At 5 volts, this unit really humms, spinning at 145RPM and drawing 88mA no-load (610mA stall producing 20in*oz torque).

Size: 37 x 27 x 21 mm

This 143:1 gear motor is much like the GM2 gear motor but runs at nearly twice the speed. Great for robots needing speed over torque!

Size 55mm x 48mm x 23mm

The provided mounting holes in the GM2/GM8 gear motors are a convenient way to mount these to your project, but sometimes you just need a different way to mount them.

These precision laser-cut steel brackets match the features on the gear motor, and securely clamp them down to your project.

Use any #4-sized screw or nut/bolt for assembly.

This pager gear motor is geared 81:1 spins at 370 RPM and draws 24.6mA (184mA stall) at 5V giving 3.6in.oz.

Size 1" wide, 0.564" thick, 1.135" long

The square output shaft measures 0.14" per side.

Due to the longer shaft lengths on the GM2 and GM3, the encoder wheel reflector is a bit too far away from the sensors on the Wheel Watcher.

Use this spacer to bring the reflector back into range.

These new hard plastic wheels are specially designed for our GM2, GM3, GM8, GM9 and GM17 gear motor output shafts.

Although usable as wheels, we often use these as mounts for legs and other mechanisms as they have convenient mounting holes that match our leg mounting pads.

Looking for a tiny gear motor?

The GM15, measuring under 6mm (0.235") diameter, with an overall length of 20.1mm (0.79"), which is smaller than many pager motors!

The output shaft is grooved for a 1.5mm radius belt, but Solarbotics have modified it to mate with there10mm RW wheel (drilled out to 0.086").

They weigh only 1.3grams.

The 360:1 Mini Metal Gear Motor looks much like our other mini metal gear motors, except the motor is longer, and the gearing is in an enclosed cylindrical casing.

These compact brackets enable convenient mounting of popular, Sanyo-style miniature metal gearmotors. The white plastic bracket encloses the otherwise exposed gears, and the mounting tabs capture the nuts for easy installation. This version has mounting tabs that allow for use with the Pololu Wheel 42×19 mm and encoder. The brackets are sold in pairs, and each bracket comes with two #2 screws and two nuts.

This gearmotor is a miniature (0.94" x 0.39" x 0.47"), high-quality, high-power motor with 210:1 metal gearbox, similar to Sanyo’s popular 12 mm gearmotors.

These units have a 9.27mm long, 3 mm-diameter D-shaped output shaft, and the brass faceplate has two mounting holes threaded for M1.6 screws (1.6 mm diameter, 0.35 mm thread pitch).

Practically identical to the now out-of-production GM13 Sanyo NA3S, this gear motor offers a bit more speed at less cost to you.

The major difference between this model and the GM13 is that the front faceplate is brass, not steel.

If you're looking for a speedy motor with a reasonable amount of torque (for say, moving a small robot that isn't going to fight in a Sumo contest), the GM11a is an excellent candidate.

This particular motor has a 7.4mm long, 3mm diameter cylindrical output shaft that hasn't been pre-ground with a flat spot, so you can be guaranteed a very true-running shaft.

This gearmotor is a miniature (24mm x 10mm x 12mm), high-quality, high-power motor with 10:1 metal gearbox, similar to Sanyo’s popular 12 mm gearmotors.

These units have a 9.27mm long, 3 mm-diameter D-shaped output shaft, and the brass faceplate has two mounting holes threaded for M1.6 screws (1.6 mm diameter, 0.35 mm thread pitch).

Key specs at 6 V: 3000 RPM and 120 mA free-run, 4 oz-in (0.3 kg-cm) and 1.6 A stall.