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Pololu 4.4:1 Metal Gearmotor 25D × 63L (HP 12V) with 48 CPR Encoder 

Need a fast, high-power DC gearmotor with position/speed feedback? This 25D metal gearmotor combines a 12V high-power brushed DC motor with a rugged 4.4:1 metal spur gearbox, plus a built-in quadrature encoder for reliable RPM measurement, distance tracking, and closed-loop control.

  • Encoder feedback built-in: 48 CPR on the motor shaft = 211.2 counts/rev at the gearbox output (when counting both edges of both channels).
  • Fast output ratio: 4.4:1 is ideal when you want higher wheel/roller speed while still gaining torque.
  • Ready-to-wire encoder cable: 6 color-coded leads (~20cm) terminated in a 1×6 0.1" female header.
  • Rugged mechanics: metal spur gears + compact 25D body for robots, conveyors, feeders, and drive systems.

Best for builders who want “motor + gearbox + encoder” in one clean package for speed control, odometry, and repeatable motion.

Why/Benefits

Feedback you can use
  • Measure speed (RPM) and distance (counts)
  • Detect stalls or jams via changing counts
  • Build closed-loop speed/position control
Fast, high-power drivetrain
  • Great for wheels, rollers, and mechanisms that need speed
  • Metal gearbox handles tougher loads than plastic gearmotors
  • Compact 25mm form factor for tight builds

Technical specifications

Motor type Brushed DC (High-Power, 12V
Gearbox Metal spur gearbox
Gear ratio 4.4:1 (exact: (22×24)/(12×10))
Encoder Quadrature Hall encoder, 48 CPR (motor shaft)
Counts per output revolution 211.2 counts/rev (4.4 × 48, counting both edges of both channels)
Encoder supply (Vcc) 3.5V to 20V, ≤10mA
Encoder outputs A/B square waves, 0V to Vcc (≈90° phase shifted)
Body diameter Just under 25mm
Output shaft 4mm D-shaft, ~12.5mm length from gearbox face
Mounting 2× M3 threaded holes on gearbox face
Encoder cable 6 color-coded leads (~20cm) to 1×6 0.1" female header

Pinout & power notes

  • Motor wires: Red = motor terminal, Black = motor terminal (swap to reverse direction).
  • Encoder power: Blue = Vcc (3.5–20V), Green = GND.
  • Encoder signals: Yellow = Channel A, White = Channel B.
  • 3.3V microcontrollers: the encoder needs ≥3.5V Vcc, so if you power it at 5V, use a level shifter or divider on A/B into 3.3V GPIO.
  • Screw depth warning: avoid screwing too far into the mounting holes—recommended insertion depth is ≤6mm.

Pro tip: For stable encoder readings, keep signal wires away from motor power wires and add basic noise filtering (good grounding, tidy wiring).

FAQ

  • What does “48 CPR” mean?
    It means the encoder outputs 48 counts per revolution of the motor shaft when counting both edges of both channels. Multiply by the gear ratio to estimate counts per output-shaft revolution.
  • Can I use this with Arduino/ESP32?
    Yes. Use a motor driver for the motor power, and read the A/B encoder signals on GPIO. For 3.3V boards, level-shift the encoder outputs if Vcc is 5V.
  • Do I need a special motor driver?
    Use a driver that matches your motor voltage/current needs. For higher-power builds, consider robust drivers like TB9051FTG/VNH5019-class modules.
  • Is this available without an encoder?
    Yes—this gearmotor series has versions without encoders (useful if you only need open-loop control).

4.4:1 Metal Gearmotor 25Dx63L mm HP 12V with 48 CPR Encoder

4.4:1 Metal Gearmotor 25Dx63L mm HP 12V with 48 CPR Encoder

Out of stock

Product Code

POL4841

₱ 4,926.00
₱ 4,926.00
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