Pololu 3201 / 3202 / 3203 / 3204 / 3205 / 3206 / 3207 Metal Gearmotor 25D HP 12V
Pololu 3201 / 3202 / 3203 / 3204 / 3205 / 3206 / 3207 Metal Gearmotor 25D HP 12V
Pololu 3201 / 3202 / 3203 / 3204 / 3205 / 3206 / 3207 Metal Gearmotor 25D HP 12V
The Pololu 3201-3207 Metal Gearmotor 25D HP series is a high-performance 12V DC motor with integrated metal gearbox, delivering variable torque and speed configurations for precision robotics and automation applications. Roboticists, embedded systems engineers, and automation technicians rely on these gearmotors for mobile robot platforms, conveyor systems, and mechanical actuators requiring reliable torque transmission with minimal backlash. This product solves the critical challenge of integrating compact, efficient power transmission in space-constrained applications where standard motors lack adequate torque or speed control capabilities.
Product Overview
The Pololu 25D Metal Gearmotor series represents a breakthrough in compact drivetrain design, combining a high-efficiency DC motor with a precision metal gearbox housed in a robust 25mm diameter cylindrical enclosure. The metal gearbox construction ensures superior durability and backlash reduction compared to plastic alternatives, critical for applications demanding accurate positioning and repeatable motion control. Each model in the 3201-3207 range offers different gear ratios, allowing engineers to select the optimal speed-torque tradeoff for their specific mechanical requirements without redesigning the motor mount or power delivery system.
The 12V operating voltage makes these gearmotors ideal for battery-powered robotics projects, electric vehicles, and portable automation equipment. The integrated gearbox eliminates the need for external transmission components, reducing assembly complexity and mechanical losses. With shaft-mounted encoder compatibility and straightforward DC control via PWM or relay circuits, the 25D HP series integrates seamlessly into microcontroller-based systems. The robust metal construction withstands mechanical shock, vibration, and sustained high-load operation typical in field robotics and industrial automation environments.
Key Specifications
| Specification | Details |
| Product Type | Metal Gearmotor with Integrated Gearbox |
| Brand | Pololu Robotics and Electronics |
| Origin | Original and Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Operating Voltage | 12V DC nominal |
| Motor Diameter | 25mm cylindrical housing |
| Gear Ratio Options | 3201: 30.39:1, 3202: 50.39:1, 3203: 75.81:1, 3204: 131.25:1, 3205: 150.39:1, 3206: 228.75:1, 3207: 298.75:1 |
| Output Shaft | D-shaped shaft, 3mm diameter |
| Gearbox Material | Metal construction with precision-cut gears |
| Backlash | Less than 10 degrees typical |
| Encoder Compatibility | Compatible with Pololu magnetic encoders |
| Stall Torque | Varies by gear ratio (up to 15 kg-cm at highest ratio) |
| No-Load Current | Approximately 100-200mA depending on gear ratio |
| Stall Current | Approximately 5A at 12V |
Key Features
- Metal Gearbox Construction: Precision-machined metal gears eliminate plastic wear and backlash, ensuring accurate positioning for autonomous navigation and robotic arm applications requiring repeatable motion control
- Multiple Gear Ratio Selection: Seven distinct models spanning 30:1 to 298:1 ratios allow engineers to optimize speed-torque characteristics for specific load requirements without changing motor specifications
- Compact 25mm Form Factor: Space-efficient cylindrical design integrates into confined robot chassis, wheeled platforms, and mechanical linkages with minimal footprint impact
- High Efficiency Power Transmission: Metal gearbox delivers superior mechanical efficiency compared to plastic alternatives, maximizing battery runtime in portable robotics and reducing thermal dissipation requirements
- Encoder-Ready Design: Pre-drilled mounting points and compatible encoder interfaces enable closed-loop speed control and odometry feedback for mobile robot navigation systems
- Robust Shaft Interface: D-shaped 3mm output shaft provides secure coupling to wheels, gears, and mechanical linkages with minimal slippage under dynamic load conditions
Applications and Use Cases
- Autonomous Mobile Robots: Drive wheel actuation for differential-drive platforms requiring consistent torque delivery and encoder feedback for dead-reckoning navigation and SLAM algorithms
- Robotic Arms and Manipulators: Joint actuation in 4-6 DOF robotic arms where precise speed control and high holding torque prevent load drift and ensure accurate end-effector positioning
- Conveyor and Material Handling Systems: Reliable belt drive actuation in warehouse automation, sorting systems, and production line conveyors requiring continuous duty operation and repeatable speed control
- Electric Vehicle Drivetrains: Wheel motor implementation in battery-powered scooters, wheelchairs, and small electric vehicles where compact form factor and efficient power transmission extend operational range
- Automated Guided Vehicles (AGVs): Steering and propulsion control in warehouse AGVs and autonomous delivery robots navigating complex indoor environments with encoder-based odometry
- Educational Robotics Platforms: Ideal for FIRST Robotics, university robotics competitions, and STEM education projects where students require reliable, affordable drivetrain components
How to Use
Begin by selecting the appropriate gear ratio model based on your application requirements. Calculate the required torque and speed using the formula: Torque (kg-cm) = Load Force (kg) × Lever Arm (cm), then reference the gear ratio specifications to determine which model delivers adequate stall torque with acceptable no-load speed. Connect the motor leads (typically red for positive, black for ground) to your 12V power supply through a PWM motor controller or relay circuit. For microcontroller integration, use a motor driver IC such as the L298N or TB6612FNG to enable bidirectional control and speed regulation via PWM signals.
For closed-loop applications, mount a Pololu magnetic encoder on the output shaft and connect the encoder signal lines to your microcontroller's interrupt pins. Implement PID control algorithms to regulate motor speed based on encoder feedback, essential for maintaining consistent wheel speeds in differential-drive robots or synchronized multi-motor systems. Always include a flyback diode across the motor terminals to protect your motor controller from back-EMF spikes during rapid deceleration or direction reversal. Test the motor under load before integrating into your final assembly, and verify that the selected gear ratio provides adequate torque margin (typically 1.5-2x the calculated load torque) to ensure reliable operation across temperature variations and mechanical wear.
Frequently Asked Questions
What is the difference between the Pololu 3201 through 3207 models?
The primary difference is the internal gear ratio. Model 3201 has a 30.39:1 ratio providing higher speed and lower torque, while model 3207 has a 298.75:1 ratio delivering maximum torque at reduced speed. Intermediate models offer graduated steps between these extremes. Choose based on your application: use lower ratios for high-speed applications like wheeled robots, and higher ratios for heavy-load applications like robotic arms or conveyor drives requiring substantial holding torque.
Can I attach a wheel directly to the output shaft?
Yes, the 3mm D-shaped output shaft is designed for direct coupling to wheels, pulleys, and gears. Ensure your wheel hub has a matching 3mm D-shaped bore or use a shaft coupler for secure connection. Tighten set screws firmly but avoid over-tightening, which can strip the plastic hub. For high-torque applications, consider using a metal hub with dual set screws for maximum security and backlash elimination.
What is the maximum continuous current and thermal dissipation rating?
The Pololu 25D metal gearmotors are rated for approximately 5A stall current at 12V. For continuous operation, limit current to 2-3A to prevent thermal damage to the motor windings. The metal gearbox provides excellent heat dissipation, but sustained high-current operation will generate heat. Monitor motor temperature during extended runs, and ensure adequate ventilation. If your application requires continuous stall torque, select a higher gear ratio model to reduce the motor load and current draw.
Is encoder feedback compatible with these motors?
Yes, these motors are fully compatible with Pololu magnetic encoders and standard quadrature encoders. The motor shaft design allows encoder mounting without modification. Connect encoder output signals to your microcontroller's interrupt pins to implement closed-loop speed control. Typical encoder resolution ranges from 12 to 64 counts per revolution depending on the encoder model, providing adequate resolution for accurate odometry and speed feedback in robotics applications.
What is the backlash specification and how does it affect robot accuracy?
The metal gearbox design delivers less than 10 degrees of backlash, significantly lower than plastic alternatives. This low backlash is critical for accurate positioning in robotic arms and ensures minimal speed variation between forward and reverse motion in differential-drive robots. For applications requiring sub-degree accuracy, consider implementing backlash compensation algorithms in your motor control firmware, or use dual encoders to measure actual wheel position independent of motor shaft rotation.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Tech Depot
- Genuine Products: Sourced directly from authorized Pololu distributors with authentication certificates and original packaging
- Expert Team: Our technical team validates every product before listing and provides application-specific recommendations
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse with real-time tracking
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