empowering creative people

298:1 Micro Metal Gearmotor HP

SKU: POLOLU-994

$20.05 AUD, inc GST
$18.23 AUD, exc GST
298:1 Micro Metal Gearmotor HP
20.05 AUD

SKU: POLOLU-994

$20.05 AUD, inc GST
$18.23 AUD, exc GST
In stock, ships today if ordered before 2PM
Delivered by Wed, 25th of Oct
Shipping Offer

Overview

These tiny brushed DC gearmotors are intended for use at 6 V, though in general, these kinds of motors can run at voltages above and below this nominal voltage, so they should comfortably operate in the 3 – 9 V range (rotation can start at voltages as low as 0.5 V). Lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor. The micro metal gearmotors are available in a wide range of gear ratios—from 5:1 up to 1000:1—and offer a choice between three different motors: high-power (HP), medium-power (MP), and standard. With the exception of the 1000:1 gear ratio versions, all of the micro metal gearmotors have the same physical dimensions, so one version can be easily swapped for another if your design requirements change. Please see the micro metal gearmotor comparison table for detailed specifications of all Pololu's micro metal gearmotors. This dynamically-sortable table can help you find the gearmotor that offers the best blend of speed, torque, and current-draw for your particular application. A more basic comparison table is available below.

Some versions of the gearmotors are sold with an additional 1mm-diameter output shaft that protrudes from the rear of the motor. This 4.5mm-long rear shaft rotates at the same speed as the input to the gearbox and offers a way to add an encoder, such as Pololu's magnetic encoder for micro metal gearmotors, to provide motor speed or position feedback.

Motor Type Stall
Current
@ 6 V
No-Load
Speed
@ 6 V
Stall Torque
@ 6 V


Gearbox Shaft Only


Gearbox & Motor Shafts
high-power
(HP)
1600 mA 6000 RPM 2 oz-in 5:1 micro HP
3000 RPM 4 oz-in 10:1 micro HP 10:1 micro HP
1000 RPM 9 oz-in 30:1 micro HP 30:1 micro HP
625 RPM 15 oz-in 50:1 micro HP 50:1 micro HP
400 RPM 22 oz-in 75:1 micro HP 75:1 micro HP
320 RPM 30 oz-in 100:1 micro HP 100:1 micro HP
200 RPM 40 oz-in 150:1 micro HP
140 RPM 50 oz-in 210:1 micro HP
120 RPM 60 oz-in 250:1 micro HP
100 RPM 70 oz-in 298:1 micro HP 298:1 micro HP
32 RPM 125 oz-in 1000:1 micro HP
medium-power
(MP)
700 mA 2200 RPM 3 oz-in 10:1 micro MP 10:1 micro MP
730 RPM 8 oz-in 30:1 micro MP
420 RPM 13 oz-in 50:1 micro MP
290 RPM 17 oz-in 75:1 micro MP 75:1 micro MP
220 RPM 19 oz-in 100:1 micro MP 100:1 micro MP
150 RPM 24 oz-in 150:1 micro MP
75 RPM 46 oz-in 298:1 micro MP
low-power 360 mA 2500 RPM 1 oz-in 5:1 micro
1300 RPM 2 oz-in 10:1 micro
440 RPM 4 oz-in 30:1 micro 30:1 micro
250 RPM 7 oz-in 50:1 micro 50:1 micro
170 RPM 9 oz-in 75:1 micro
120 RPM 12 oz-in 100:1 micro 100:1 micro
85 RPM 17 oz-in 150:1 micro
60 RPM 27 oz-in 210:1 micro
50 RPM 32 oz-in 250:1 micro
45 RPM 40 oz-in 298:1 micro 298:1 micro
14 RPM 70 oz-in 1000:1 micro

Note: The 1000:1 gearmotors can generate enough torque to damage themselves. The stall torque values given for those two motors are theoretical, and Pololu strongly recommend you avoid stalling them.

Details for item #994

Exact gear ratio: (25×34×37×35×38) / (12×9×10×13×10) ~~ bb(297.92:1)

Gearmotor Dimensions

Micro metal gearmotor dimensions (units in mm).

The gearbox has a long (0.365" or 9.27 mm), 3 mm-diameter D-shaped metal output shaft, and the brass faceplate has two mounting holes threaded for M1.6 screws (1.6 mm diameter, 0.35 mm thread pitch). The gearmotor weighs approximately 0.35 oz (10 g). Versions with the extended motor shaft have a 1mm diameter round shaft that protrudes 4.5 mm from the rear of the motor, between the two motor terminals; this is not pictured in the above dimension diagram. In terms of size, these gearmotors are very similar to Sanyo’s popular 12 mm NA4S DC gearmotors, and gearmotors with this form factor are often referred to as N20 motors.

The gearbox on the 1000:1 and 1000:1 HP micro metal gearmotors is 12.5 mm long. All of the other micro metal gearmotors have 9mm-long gearboxes, as shown in the above dimension diagram.

Motor Accessories

Pololu wheel 32×7mm on a micro metal gearmotor.
Pololu wheel 42×19mm with micro metal gearmotor.
A pair of Pololu universal aluminum mounting hubs for 3 mm diameter shafts.
Black Pololu 70×8mm wheel on a Pololu micro metal gearmotor.
Black Pololu 90×10mm wheel on a Pololu micro metal gearmotor.
Pololu 30T track set with drive sprocket mounted on a micro metal gearmotor to the left; idler sprocket is on the right.

Black micro metal gearmotor mounting bracket pair with included screws and nuts.
White micro metal gearmotor mounting bracket pair with included screws and nuts.
Pololu micro metal gearmotor bracket extended with micro metal gearmotor.
  • Quadrature encoders: Pololu offer several quadrature encoders that work with Pololu's micro metal gearmotors.

Encoder for Pololu wheel 42×19mm with wheel, motor, and bracket.
Example of an installed micro metal gearmotor reflective optical encoder.
Magnetic Encoder Kit for Micro Metal Gearmotors assembled with ribbon cable wires.

Pololu qik 2s9v1 dual serial motor controller.
Baby Orangutan B-48/B-168/B-328.
DRV8835 dual motor driver carrier.

Pololu also incorporate these motors into some of Pololu's products, including Pololu's 3pi robot and Zumo robot:

Pololu 3pi robot.
Assembled Zumo robot with a Zumo Shield, Arduino Uno, and Zumo blade.

Selecting the Right Gearmotor

Pololu offer a wide selection of metal gearmotors that offer different combinations of speed and torque. Pololu's metal gearmotor comparison table can help you find the motor that best meets your project’s requirements.

Some of the Pololu metal gearmotors.

This product is listed in:

Documentation and Resources:
  • The Maker Revolution
  • The Maker Revolution celebrates the creation of new devices and the modification of existing ones - the transition from a consumer buying goods to eventually having a major part in their creation. The Maker Revolution places strong emphasis on free (...
  • Motor Drivers vs. Motor Controllers
  • If you’ve ever built a robot with wheels, or any motorised parts really, you’ll have come across the issue of needing to drive it from your microcontroller. Because a standard chip is only able to output a small amount of current, you&rsq...

Product Comments

We deliver Australia-wide with these options:

  • $3 for Small Items (4-6 days, not tracked, only available on selected small items)
  • $6.95 for Standard Post (2-4 days, tracked)
  • $8.32 for Express Post (1-2 days, tracked)
  • Pickup - Free! Only available to customers who live in the Newcastle region (only after we email you to notify your order is ready)

International Orders - the following rates are for New Zealand and will vary for other countries:

  • $11.49 for Pack and Track (3+ days, tracked)
  • $16.50 for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount might increment based on the weight of your order.

Our physical address:

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

Please checkout our customer service page if you have other frequently asked questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.