Pololu 4800 / 4801 / 4802 / 4803 / 4804 / 4805 / 4806 / 4807 / 4808 HP 6V Motor with 48 CPR Encoder for 25D mm Metal Gearmotors
Pololu 4800 / 4801 / 4802 / 4803 / 4804 / 4805 / 4806 / 4807 / 4808 HP 6V Motor with 48 CPR Encoder for 25D mm Metal Gearmotors
Pololu 4800 / 4801 / 4802 / 4803 / 4804 / 4805 / 4806 / 4807 / 4808 HP 6V Motor with 48 CPR Encoder for 25D mm Metal Gearmotors
The Pololu HP 6V Motor with 48 CPR Encoder is a high-performance brushed DC motor integrated with a precision quadrature encoder, specifically designed for the 25D mm metal gearmotor platform. Roboticists, autonomous vehicle developers, and industrial automation engineers rely on this motor for accurate motion control and real-time position feedback in mobile robots, wheeled platforms, and precision positioning systems. This motor solves the critical challenge of achieving both high torque output and precise speed/position feedback without requiring external sensor integration, eliminating design complexity and reducing system cost.
Product Overview
The Pololu 4800-4808 series represents a complete ecosystem of high-performance gearmotors with integrated quadrature encoders. The motor operates at 6V nominal voltage and features a 48 counts-per-revolution encoder, providing excellent resolution for closed-loop speed control and odometry calculations. The encoder outputs two 90-degree phase-shifted square wave signals that enable bidirectional rotation detection and precise motor speed measurement. The 25D mm form factor delivers exceptional power density, with the metal gearbox housing providing durability for field robotics applications while maintaining compact dimensions suitable for space-constrained platforms.
The encoder resolution of 48 CPR translates to 192 counts per revolution when using quadrature decoding (4x multiplier), offering sufficient granularity for smooth velocity control in wheeled mobile robots and accurate distance measurement in odometry systems. The integrated design eliminates mechanical backlash issues associated with external encoder mounting, ensuring reliable feedback signal integrity even in vibration-prone environments. Different gear ratios across the 4800-4808 variants allow engineers to optimize the torque-speed tradeoff for specific application requirements, from high-speed light-load applications to low-speed high-torque operations.
Key Specifications
| Specification | Details |
| Product Type | Brushed DC Motor with Integrated Quadrature Encoder |
| Brand | Pololu |
| Origin | Original/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 |
| Nominal Voltage | 6V DC |
| Encoder Resolution | 48 CPR (192 counts per revolution with quadrature decoding) |
| Motor Type | Brushed DC with permanent magnet |
| Gearbox Housing | Metal construction (25D mm form factor) |
| Encoder Output | Two phase-shifted quadrature signals with index pulse |
| Operating Temperature Range | -20 to +60 degrees Celsius |
Key Features
- Integrated 48 CPR quadrature encoder providing 192 counts per revolution resolution for precise closed-loop speed control and odometry feedback in mobile robotics applications
- Brushed DC motor design with high power-to-weight ratio enabling rapid acceleration and deceleration suitable for dynamic navigation tasks
- Metal gearbox construction offering superior durability, reduced backlash, and extended operational lifespan in field robotics and outdoor environments
- Multiple gear ratio options across the 4800-4808 series allowing optimization for specific torque-speed requirements without changing motor footprint
- Compact 25D mm diameter form factor enabling integration into space-constrained platforms including small wheeled robots and autonomous vehicles
- Index pulse output enabling absolute position reference detection and multi-turn position tracking without external homing sensors
Applications and Use Cases
- Autonomous mobile robots requiring accurate odometry feedback for simultaneous localization and mapping (SLAM) algorithms and dead reckoning navigation systems
- Wheeled robotic platforms for RoboCup competitions and educational robotics where precise motor control and encoder feedback are essential for competitive performance
- Line-following and maze-solving robots utilizing encoder feedback for synchronized dual-motor speed control and trajectory correction
- Industrial automation conveyor systems and material handling equipment requiring reliable motor feedback for load detection and speed regulation
- Precision positioning systems for robotic arms and turntables where encoder feedback enables accurate angular positioning and velocity profiling
- Autonomous ground vehicles and delivery robots requiring integrated motor feedback for traction control and slip detection algorithms
How to Use
Begin by identifying the specific gear ratio variant (4800-4808) that matches your torque and speed requirements. Connect the motor power leads to your 6V power supply, ensuring proper polarity to avoid reverse rotation. The encoder outputs require connection to a microcontroller with quadrature decoder capability such as Arduino, STM32, or Raspberry Pi GPIO pins configured as digital inputs. Configure your microcontroller to read both encoder channels simultaneously, implementing interrupt-driven or polling-based decoding to capture all rotation events without missing counts.
For optimal performance, implement closed-loop speed control using the encoder feedback to adjust PWM duty cycle dynamically. The 48 CPR resolution provides sufficient granularity for smooth velocity control at typical robot speeds of 0.1 to 2 meters per second. When integrating multiple motors for differential drive platforms, synchronize the speed control loops across both motors using encoder feedback to compensate for mechanical variations and ensure straight-line motion. The index pulse output can be utilized for absolute position referencing during system initialization or periodic calibration routines. Apply appropriate decoupling capacitors (0.1 microfarad) near the encoder signal outputs to minimize noise susceptibility in electrically noisy environments.
Frequently Asked Questions
What is the difference between the Pololu 4800 through 4808 variants?
The Pololu 4800-4808 series features identical motor and encoder specifications but different gear ratios ranging from 5:1 to 150:1 reduction. Lower numbered variants (4800-4802) provide higher output speeds with lower torque, suitable for fast-moving robots. Higher numbered variants (4806-4808) offer lower speeds with higher torque, ideal for heavy-load applications. The encoder resolution remains constant at 48 CPR across all variants, ensuring consistent feedback resolution regardless of gear ratio selection.
How do I decode the quadrature encoder signals correctly?
The encoder outputs two 90-degree phase-shifted square waves. Implement a quadrature decoder that monitors both channels simultaneously using interrupt handlers or polling loops. When channel A leads channel B during a rising edge transition, the motor rotates forward; when channel B leads channel A, rotation is reverse. Each complete cycle of both channels represents one encoder count. Using 4x multiplier decoding (detecting all edges on both channels) yields 192 counts per revolution, providing maximum resolution for speed measurement and position tracking.
Can I use these motors with PWM speed control?
Yes, these motors are fully compatible with PWM speed control. Apply PWM signals to the motor power leads at frequencies between 5 kHz and 20 kHz to avoid audible noise and minimize switching losses. The encoder signals remain independent of PWM duty cycle and continue to provide accurate feedback at all speed levels. Implement closed-loop control by adjusting PWM duty cycle based on encoder feedback to maintain constant speed despite load variations and motor aging effects.
What is the maximum continuous current draw of these motors?
The maximum continuous current varies slightly across gear ratio variants, typically ranging from 200 mA to 400 mA at 6V nominal voltage under moderate load. Stalled motor current can exceed 1 ampere, so ensure your power supply and motor driver circuits can handle peak current demands. For battery-powered applications, calculate power consumption based on expected duty cycle and motor speed to ensure adequate battery capacity for your mission duration.
How accurate is the encoder feedback for distance measurement?
Encoder accuracy depends on mechanical wheel diameter precision and gear ratio tolerance. With 192 counts per revolution (48 CPR quadrature), each count represents approximately 10.4 millimeters of travel for a typical 63 millimeter diameter wheel. Accumulated encoder error over long distances typically ranges from 2-5 percent due to wheel slip, uneven terrain, and mechanical tolerances. For precise odometry in autonomous systems, implement periodic calibration using external position references or fusion with inertial measurement units.
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 distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
- Technical Support: 24/7 expert guidance via email and WhatsApp
- Returns: 7-day return policy on manufacturing defects only
Buy Pololu 4800 / 4801 / 4802 / 4803 / 4804 / 4805 / 4806 / 4807 / 4808 HP 6V Motor with 48 CPR Encoder for 25D mm Metal Gearmotors Online in India
Purchase the Pololu 4800 / 4801 / 4802 / 4803 / 4804 / 4805 / 4806 / 4807 / 4808 HP 6V Motor with 48 CPR Encoder for 25D mm Metal Gearmotors online at The Tech Depot, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata,