378:1 Metal Gearmotor 25Dx73L mm LP 12V with 48 CPR Encoder

(1 customer review)

£31.27 inc VAT

Availability: 6 in stock

Brand: Pololu
Part Number: 4890
Barcode: 5055421002909
SKU: PPPOL4890 Categories: , , , Tags: , , ,
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378:1 Metal Gearmotor 25Dx73L mm LP 12V with 48 CPR Encoder

This gearmotor consists of a low-power, 12 V brushed DC motor combined with a 377.93:1 metal spur gearbox and it has an integrated 48 CPR quadrature encoder on the motor shaft. Resulting in an output that can provide 18,140.79 counts per revolution of the gearbox’s output shaft. The gearmotor is cylindrical, with a diameter just under 25 mm and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox.

These cylindrical brushed DC gearmotors are available in a wide range of gear ratios and with five different motors (two power levels of 6 V motors and three power levels of 12 V motors). The gearmotors all have the same 25 mm diameter case and 4 mm diameter gearbox output shaft, so it is generally easy to swap one version for another if your design requirements change (though the length of the gearbox tends to increase with the gear ratio).

Key specifications:

voltage no-load performance stall extrapolation
12 V 14 RPM, 100 mA 23 kg⋅cm (320 oz⋅in), 1.1 A


Size: 25D x 73L mm1
Weight: 110 g
Shaft diameter: 4 mm

General specifications:

Gear ratio: 377.93:1
No-load speed @ 12V: 14 rpm
No-load current @ 12V: 100 mA
Stall current @ 12V: 1100 mA
Stall torque @ 12V: 320 oz·in2
No-load speed @ 6V: 7 rpm3
Stall current @ 6V: 550 mA3
Stall torque @ 6V: 160 oz·in3
Lead length: 8 in4
Motor type: 1.1A stall @ 12V (LP 12V)
Encoders?: Y


Length measurement is from gearbox face plate to back of encoder cap (it does not include the output shaft). See dimension diagram for details
This is a theoretical value; stalling the gearbox output shaft is likely to damage the gearbox
This motor will run at 6 V but is intended for operation at 12 V
May vary by a few inches

Additional Information:

Supplier is Pololu, 4890.

On our YouTube Channel you will find a range of interesting video tutorials. They cover a wide spectrum of topics including the use of features such as Pulse Width Modulation (PWM), Real Time Clock (RTC), RGB LED, Serial Monitor, Stepper Motors, Thermal Array, RFID, Data logging and many more.

1 review for 378:1 Metal Gearmotor 25Dx73L mm LP 12V with 48 CPR Encoder

  1. David Simons

    Lovely motor, well made and fabulous action. Loving the new site proto-pic!

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