The GA12-N20 DC Geared Motor is a high-precision, miniature power solution that integrates a rugged metal gearbox with a dual-channel magnetic encoder. This "intelligent" motor allows for closed-loop control, enabling microcontrollers to track speed, direction, and exact position. Its compact 10 x 12 mm cross-section makes it the standard choice for advanced micro-robotics and surgical tools where space is at a premium but precision is mandatory.

Specifications

• Model: GA12-N20
• Rated Voltage: 6V DC
• No-Load Speed: 300 RPM
• Rotation: Clockwise (CW) when viewed from the output shaft side.
• Shaft Type: D-type (Non-slip flat side).
• Shaft Dimensions: 3mm Diameter x 9mm Length.
• Encoder Type: Dual-channel Hall Effect (Quadrature).
• Resolution: 7 Pulses Per Revolution (PPR) per channel (base motor speed).
• Wire Length: 150mm.

Features

• Closed-Loop Feedback: The dual-channel encoder provides two signal outputs (C1 and C2). By measuring the phase shift between these signals, a controller can determine both the speed and the direction of rotation.
• High Torque-to-Size Ratio: The integrated gearbox significantly multiplies the motor's force, allowing this tiny unit to drive wheels or actuators under load.
• All-Metal Gearbox: Precision-cut metal gears ensure a long operational life and high resistance to wear compared to plastic gear assemblies.
• Simplified Wiring: Comes with a pre-installed 150mm wiring harness, color-coded for easy connection to motor drivers and microcontrollers.

Wiring Configuration

Common Applications

• Advanced Robotics: Self-balancing robots, line followers with odometry, and small-scale mapping rovers.
• Medical Equipment: High-precision medical pumps, surgical tools, and laboratory stirrers or centrifuges.
• Industrial Automation: Electric valves, miniature actuators, and high-precision sorting mechanisms.
• Smart Devices: Precise window blind controls and automated camera gimbal movements.

Usage Tips

• Encoder Power: Always connect the Black (VCC) and Blue (GND) wires to a clean, regulated 3.3V or 5V logic supply. Do not connect them to the motor's power source to avoid damaging the Hall sensors with electrical noise.
• Interrupt-Driven Counting: To ensure no pulses are missed at 300 RPM, connect the Green (C1) and Yellow (C2) wires to interrupt-capable pins on your microcontroller.
• Mounting: Use a standard N20 mounting bracket to secure the motor. Ensure the wiring harness has proper strain relief to prevent the small pins on the encoder PCB from snapping.
• Position Tracking: Total resolution is calculated by multiplying the 7 PPR of the encoder by the gearbox reduction ratio. This allows for extremely high-resolution positioning of the output shaft.