The N20 Gear Motor is a miniature, high-torque DC motor paired with a precision metal gearbox. The 3V 50RPM variant is optimized for low-voltage, battery-powered projects that require a balance between steady speed and mechanical force. It is widely used in micro-robotics and small-scale automation due to its reliability and extremely compact footprint.

Specifications

• Rated Voltage: 3V DC (Operating range: 1.5V – 6V).
• No-Load Speed: 50 RPM (at 3V).
• Shaft Type: D-shape (flat side for secure, non-slip mounting).
• Shaft Diameter: 3mm.
• Shaft Length: 10mm.
• Gearbox Material: All-metal (Precision brass and steel gears).
• No-Load Current: ~ 25mA.
• Stall Current: ~ 350mA (at 3V).
• Stall Torque: ~ 1.5 kgcm to 2.2 kgcm (varies by manufacturer).

Features

• Efficiency at Low Voltage: Reaches its optimal performance on just 3V, making it perfect for devices powered by two AA batteries or a single 18650 Li-ion cell.
• Durable Metal Gearing: The all-metal gear train is far more resilient than plastic alternatives, preventing the gears from stripping when the motor encounters resistance.
• Compact Design: The standard N20 form factor allows it to be used in space-constrained applications like inside robot wheels or small electronic housings.
• Secure D-Shaft: The 10mm D-shaped shaft ensures that wheels, couplers, or pulleys stay locked in place even under heavy vibration or load.

Pin and Connection Guide

• Terminals: Two small solder tabs at the rear of the motor.
• Direction Control: The motor is bidirectional. Reversing the positive and negative connections will change the rotation from clockwise to counter-clockwise.
• PWM Support: Fully compatible with Pulse Width Modulation for precise speed control via low-voltage motor drivers (e.g., DRV8833 or MX1508).

Common Applications

• Micro-Robotics: Driving small-wheeled robots, crawling mechanisms, or simple robotic arms.
• Smart Home Hardware: Powering the lock-bolt in electronic door locks or battery-operated smart blinds.
• Precision Actuators: Moving small internal parts in consumer electronics or DIY gadgets.
• Model Building: Providing realistic, slow-speed rotation for model cranes, elevators, or radar dishes.

Usage Tips

• Mounting: Always use a dedicated N20 bracket to secure the motor to your chassis. This prevents mechanical stress on the thin gearbox casing.
• Voltage Flexibility: While rated for 3V, it can safely run at 6V to achieve approximately 100 RPM and higher torque, though this may reduce the motor's total lifespan.
• Soldering: Use 26AWG to 30AWG flexible wire. Apply heat-shrink tubing over the soldered terminals to provide strain relief and protect the delicate tabs.
• Lubrication: The gearbox comes pre-lubricated. In high-dust environments, ensure the motor is enclosed or use a tiny drop of plastic-safe synthetic oil to maintain smooth operation.