29:1 Metal Gearmotor 20Dx41L mm

29:1 Metal Gearmotor 20Dx41L mm
Pololu item #: 1162 92 in stock

Price break Unit price (US$)
1 19.95
10 16.95
50 14.95
100 13.97


backorders allowed

These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 29:1 metal gearbox with a 0.276"-long, 4 mm-diameter D-shaped output shaft.

Key specs at 6 V: 450 RPM and 250 mA free-run, 25 oz-in (1.8 kg-cm) and 3.3 A stall.

Select options:
 Description Specs (8) Pictures (4) Resources (0) FAQs (2) On the blog (0) 
What material is the gearbox output shaft made of, and can I get the shaft customized?
The shaft is composed of hardened stainless steel. Some customization is generally possible (e.g., different length or no D-shaft) for sufficiently high-volume orders. If this is something you are interested in, please email us.
I need additional information about this motor; do you have a datasheet?

No; the information we have available for this motor can be found on its product page. However, you can approximate various additional motor parameters from the information found in the “Specs” tab.

The electrical resistance of the motor can be approximated by dividing the rated voltage by the stall current (at the rated voltage). The electromotive force constant (Ke) can be approximated by dividing the rated voltage by the free-run speed (at the rated voltage). To approximate the motor torque constant (Kt), you can divide the stall torque by the stall current.

For pretty much any DC motor, the current, speed, power, and efficiency curves as a function of torque will look like those in the graph below (assuming motor voltage and temperature are constant):

The current and speed curves are approximately linear, and the product pages for our motors provide the approximate end points for these lines: (0 torque, no-load current) and (stall torque, stall current) for the red line, and (0 torque, no-load speed) and (stall torque, 0 speed) for the blue line.

The orange output power curve is the product of the speed and the torque, which results in an inverted parabola with its peak at 50% of the stall torque.

The green efficiency curve is the output power divided by the input power, where the input power is current times voltage. The voltage is constant, so you can divide the output power curve by the current line to get the general shape of the efficiency curve, which in turn lets you identify the torque, speed, and current that correspond to max efficiency.

Note: A good general rule of thumb is to keep the continuous load on a DC motor from exceeding approximately 20% to 30% of the stall torque. Stalling gearmotors can greatly decrease their lifetimes, occasionally resulting in immediate damage to the gearbox or thermal damage to the motor windings or brushes. Do not expect to be able to safely operate a brushed DC gearmotor all the way to stall. The safe operating range will depend on the specifics of the gearmotor itself.

Related Products

56:1 Metal Gearmotor 20Dx42L mm
73:1 Metal Gearmotor 20Dx42L mm
154:1 Metal Gearmotor 20Dx44L mm
Pololu 20D mm Metal Gearmotor Bracket Pair
Dagu Wild Thumper Wheel 120x60mm Pair with 4mm Shaft Adapters - Metallic Red
Dagu Wild Thumper Wheel 120x60mm Pair with 4mm Shaft Adapters - Chrome
Pololu Universal Aluminum Mounting Hub for 4mm Shaft, #4-40 Holes (2-Pack)
Pololu Universal Aluminum Mounting Hub for 4mm Shaft, M3 Holes (2-Pack)
Pololu Aluminum Scooter Wheel Adapter for 4mm Shaft
12mm Hex Wheel Adapter for 4mm Shaft (2-Pack)
Pololu Wheel 60×8mm Pair - Black
Pololu Simple High-Power Motor Controller 18v15 (Fully Assembled)
Pololu Wheel 90×10mm Pair - White
MC33926 Motor Driver Carrier
Pololu Dual MC33926 Motor Driver Shield for Arduino
Dual MC33926 Motor Driver Carrier
Pololu Qik 2s12v10 Dual Serial Motor Controller
Pololu TReX Jr Dual Motor Controller DMC02
Orangutan SVP-1284 Robot Controller (assembled)
19:1 Metal Gearmotor 37Dx52L mm
34:1 Metal Gearmotor 25Dx52L mm HP with 48 CPR Encoder
19:1 Metal Gearmotor 37Dx52L mm with 64 CPR Encoder
34:1 Metal Gearmotor 25Dx52L mm HP
100:1 Micro Metal Gearmotor
35:1 Mini Metal Gearmotor
115:1 Metal Gearmotor 15.5Dx30L mm

Related Categories

20D mm Gearmotors
4mm Shaft Gearmotors
Pololu Metal Gearmotors
Pololu Wheels and Tracks
Brushed DC Motor Controllers
Brushed DC Motor Drivers
Robot Controllers
Log In
Pololu Robotics & Electronics
Shopping cart
(702) 262-6648
Same-day shipping, worldwide
Menu
Shop Blog Forum Support
My account Comments or questions? About Pololu Contact Ordering information Distributors