12V Low noise DC Motor 146RPM w/Encoder

The DFRobot 12V Low Noise DC Motor (Model 28PA51G) is a quiet, high-torque geared motor with a built-in two-phase hall encoder. Designed for applications where noise is a concern, it produces approximately 57–68 dBA under no-load conditions — making it well suited for indoor robotics and equipment.

The integrated encoder delivers 13 pulses per revolution at the motor shaft, which translates to 663 PPR at the gearbox output (51:1 ratio). This enables precise speed measurement and closed-loop position control using standard interrupt-based code on Arduino or similar microcontrollers.

Key Features

• Low Noise Operation – Approximately 57–68 dBA at 10 cm under no-load conditions
• High Torque Output – 10 kg·cm rated torque at 12V
• Two-Phase Hall Encoder – 13 PPR motor shaft / 663 PPR gearbox shaft for direction and position sensing
• 51:1 Planetary Gearbox – 146 RPM no-load output speed at 12V
• 6-Pin Connector – Motor power and encoder signals on a single cable

Specifications

• Model – 28PA51G
• Working Voltage – 12V DC
• No-Load Speed (motor) – 8000 RPM
• No-Load Speed (gearbox) – 146 RPM @ 12V
• No-Load Current – 0.23A @ 12V
• Stall Current – 3.6A
• Rated Torque – 10 kg·cm @ 12V
• Gear Ratio – 51:1
• Encoder Resolution – 13 PPR (663 PPR at gearbox shaft)
• Noise – ~57–68 dBA @ 10 cm (no load)
• Dimensions – 123 × 36 × 36 mm
• Weight – 270 g

Ideal For

• Indoor mobile robots and service robots
• Noise-sensitive motorised equipment
• Closed-loop speed and position control projects
• Robotics platforms requiring precise encoder feedback

Package Contents

• 1× 12V DC Motor with Encoder (28PA51G)
• 1× Encoder Cable
• 1× Encoder Board (FIT0324)

Resources

• Wiki Documentation – Wiring diagrams, encoder connection details, and sample Arduino code
• Mechanical Drawing