Metal micro gearmotor with extended shaft – 100 RPM

Description

This version of the metal micro gearmotor differs from the others because it has an additional output shaft (diameter 1 mm, length about 4.5 mm) that protrudes from the rear and rotates at the same speed as the front shaft. Thanks to this rear shaft, it is possible to add a magnetic encoder that provides motor speed and position. The metal micro gearmotor operates at 6 Vdc, has a reduction ratio of 297.92:1, and a no-load speed of 100 rpm. The front shaft is metal, D-shaped, 9 mm long; the brass front plate has two threaded holes for mounting M1.6 screws (1.6 mm diameter, 0.35 mm thread pitch). It weighs about 10 g. Direction of rotation depends on polarity. Particularly suitable for building robots. Various accessories are available for these gearmotors (see related products). Warning! The price refers to the gearmotor only; accessories shown in the images are sold separately.

Motor Accessories

Pololu Wheel 42×19mm with MMG298
(product code 7300-RP4219)    Hub 3 mm for coupling motor shaft and wheel
(product code 7300-HUB3MM)

Mounting Brackets

Pair of supports with screws and nuts included for mounting the MMG298 metal micro gearmotor
(product code 7300-MMGSUPP)    Pair of supports (longer version) with screws and nuts included for mounting the MMG298 micro gearmotor and the Encoderw4219
(product code 7300-MMGSUPP1)

Quadrature Encoder

Encoder for Pololu wheel 42 × 19 mm
(photo shows encoder, wheel, motor, and support)
(product code 7300-ENCODERW4219)    Oscilloscope image of encoder outputs with wheel spinning at 630 RPM

Technical Specifications

• Motor shaft:
  – diameter 3 mm (D-type)
  – length 9 mm
• Rear shaft:
  – diameter 1 mm
  – length about 4.5 mm

Dimensions (click on image to enlarge)