250:1 Micro Metal Gearmotor HPCB 6V with Extended Motor Shaft

Pololu item #: 3078
Brand: Pololu supply outlook
Status: Active and Preferred 
RoHS 3 compliant

Price break Unit price (US$)
1 23.45
5 21.57
25 19.85
100 18.26


backorders allowed

This is a miniature brushed DC metal gearmotor with a gearbox cross section of 10×12 mm and a 9 mm long, 3 mm diameter D-shaped gearbox output shaft.

motor/brush type gearbox encoder
HPCB 6V: high-power 6V with carbon brushes 248.98:1 with brass plates encoder-compatible (extended motor shaft)

voltage no-load performance stall extrapolation*
6 V 130 RPM, 150 mA 3.2 kg⋅cm (44 oz⋅in), 1.5 A
* Note: Stall torque and stall current specifications are theoretical values; stalls could damage the motor or gearbox.

Alternatives available with variations in these parameter(s): gear ratio motor type encoder Select variant…

 Description Specs (17) Pictures (17) Resources (3) FAQs (0) On the blog (1) 

Dimensions

Size: 10 × 12 × 25 mm1
Weight: 9.5 g
Shaft diameter: 3 mm2

General specifications

Gear ratio: 248.98:1
No-load speed @ 6V: 130 rpm3
No-load current @ 6V: 0.15 A4
Stall current @ 6V: 1.5 A5
Stall torque @ 6V: 3.2 kg·cm5
Max output power @ 6V: 1.1 W
Encoder: encoder-compatible (extended motor shaft)
Long-life carbon brushes?: Y
Motor type: 1.5A stall @ 6V (HPCB 6V - carbon brush)

Performance at maximum efficiency

Max efficiency @ 6V: 29 %
Speed at max efficiency: 100 rpm
Torque at max efficiency: 0.66 kg·cm
Current at max efficiency: 0.40 A
Output power at max efficiency: 0.71 W

Notes:

1
Output shafts add 15 mm to the 26 mm length. See dimension diagram for details.
2
D shaft.
3
Typical; ±20%.
4
Typical, ±50%; no-load current depends on internal friction, which is affected by many factors, including ambient temperature and duration of motor operation.
5
This is a theoretical value; stalling the gearbox output shaft could damage the gearbox.

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