{"product_id":"pololu-4840-4841-4842-4843-4844-4845-4846-4847-metal-gearmotor-25d-hp-12v-with-48-cpr-encoder","title":"Pololu 4840\/4841\/4842\/4843\/4844\/4845\/4846\/4847 Metal Gearmotor 25D HP 12V with 48 CPR Encoder","description":"\u003cmeta name=\"description\" content=\"Buy Pololu 4840\/4841\/4842\/4843\/4844\/4845\/4846\/4847 Metal Gearmotor 25D HP 12V with 48 CPR Encoder online in India at best price from The Tech Depot, Bengaluru. Authentic product, 7-day warranty on manufacturing defects, fast delivery across India.\"\u003e\n\n\u003ch1\u003ePololu 4840\/4841\/4842\/4843\/4844\/4845\/4846\/4847 Metal Gearmotor 25D HP 12V with 48 CPR Encoder\u003c\/h1\u003e\n\n\u003cp\u003eThe Pololu 4840-4847 Metal Gearmotor 25D HP is a high-performance brushed DC motor with integrated 48 CPR quadrature encoder, designed for precision motion control in robotics and automation applications. Professional engineers and roboticists rely on this motor for closed-loop speed regulation, odometry, and accurate position tracking in mobile robots, autonomous vehicles, and industrial control systems. This product solves the critical challenge of maintaining consistent motor speed under variable load conditions while providing real-time feedback for advanced motion algorithms.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe Pololu 25D HP gearmotor combines a compact metal-geared transmission with a powerful 12V brushed DC motor, delivering high torque output with minimal backlash. The integrated 48 counts-per-revolution quadrature encoder provides precise rotational feedback, enabling sophisticated control strategies such as PID speed regulation and dead-reckoning navigation. The encoder outputs two 90-degree phase-shifted signals that allow determination of both motor speed and direction, making it ideal for applications requiring bidirectional motion control and accurate distance measurement.\u003c\/p\u003e\n\n\u003cp\u003eThis motor series features a robust aluminum gearbox with hardened steel gears, ensuring durability under continuous operation and high-torque demands. The 25D form factor provides an optimal balance between power density and mechanical compactness, fitting seamlessly into space-constrained robotic platforms. Multiple gear ratio variants (4840-4847) allow selection of optimal speed-torque characteristics for specific application requirements, from high-speed lightweight robots to heavy-load industrial automation systems.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecification\u003c\/td\u003e\n\u003ctd\u003eDetails\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eMetal Gearmotor with Quadrature Encoder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003ePololu Robotics and Electronics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eOriginal and Authentic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e7 days on manufacturing defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping\u003c\/td\u003e\n\u003ctd\u003e1-5 days from Bengaluru\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDelivery\u003c\/td\u003e\n\u003ctd\u003e7-8 days across India\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport\u003c\/td\u003e\n\u003ctd\u003e24\/7 via Email and WhatsApp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor Type\u003c\/td\u003e\n\u003ctd\u003e12V Brushed DC Motor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEncoder Resolution\u003c\/td\u003e\n\u003ctd\u003e48 CPR Quadrature Encoder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor Diameter\u003c\/td\u003e\n\u003ctd\u003e25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGear Ratio Variants\u003c\/td\u003e\n\u003ctd\u003eMultiple ratios available (4840-4847)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e12V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e48 CPR Quadrature Encoder: Provides 48 counts per motor shaft revolution with dual-channel output for precise speed measurement and directional control in closed-loop systems\u003c\/li\u003e\n\u003cli\u003eHigh-Torque Metal Gearbox: Hardened steel gears with minimal backlash deliver consistent torque output suitable for heavy-load robotic applications and continuous duty cycles\u003c\/li\u003e\n\u003cli\u003eCompact 25D Form Factor: Space-efficient design with 25mm diameter housing enables integration into tight robotic platforms without sacrificing performance\u003c\/li\u003e\n\u003cli\u003eMultiple Gear Ratio Options: Six variants (4840-4847) with different reduction ratios allow optimization for specific speed-torque requirements across diverse applications\u003c\/li\u003e\n\u003cli\u003eBidirectional Control: Quadrature encoder output enables detection of motor direction and implementation of sophisticated motion algorithms including odometry and position tracking\u003c\/li\u003e\n\u003cli\u003eRobust Construction: Aluminum gearbox housing with sealed bearing design ensures durability and extended operational life under demanding industrial conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eApplications and Use Cases\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMobile Robot Propulsion: Drive wheels in wheeled robots with encoder feedback for accurate odometry, navigation mapping, and autonomous path planning algorithms\u003c\/li\u003e\n\u003cli\u003eAutonomous Vehicle Control: Propulsion motors in small autonomous vehicles requiring precise speed regulation and direction feedback for steering and motion control systems\u003c\/li\u003e\n\u003cli\u003eIndustrial Automation: Conveyor belt drives, robotic arm joints, and positioning systems requiring consistent torque output and real-time speed feedback for process control\u003c\/li\u003e\n\u003cli\u003ePrecision Motion Systems: CNC machine tool drives, 3D printer extruder mechanisms, and laboratory automation equipment requiring accurate position tracking and speed regulation\u003c\/li\u003e\n\u003cli\u003eEducational Robotics: Platform for teaching closed-loop control theory, PID algorithms, and sensor integration in university robotics laboratories and STEM programs\u003c\/li\u003e\n\u003cli\u003eWheeled Obstacle Avoidance Robots: Encoder-based dead-reckoning for maze-solving robots and obstacle detection platforms requiring accurate distance measurement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow to Use\u003c\/h2\u003e\n\u003cp\u003eBegin by selecting the appropriate gear ratio variant from the 4840-4847 series based on your application's speed and torque requirements. Connect the motor leads to a 12V power supply through an appropriate motor driver circuit that can handle bidirectional control if needed. The quadrature encoder outputs two digital signals that should be connected to interrupt-capable GPIO pins or dedicated encoder input channels on your microcontroller. Configure your microcontroller to count encoder pulses using interrupt handlers, ensuring you capture both rising and falling edges on both channels to achieve maximum resolution and directional information.\u003c\/p\u003e\n\n\u003cp\u003eImplement closed-loop speed control by reading encoder counts at regular intervals and comparing actual motor speed against your target setpoint. Use a PID controller to adjust the PWM duty cycle sent to the motor driver, compensating for load variations and ensuring consistent performance. For odometry applications, integrate encoder counts over time while tracking motor direction from the quadrature phase relationship to calculate total distance traveled and heading. Always verify encoder signal integrity with an oscilloscope before deploying in critical applications, and ensure proper debouncing if using software-based counting methods at high speeds.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 4840-4847 variants?\u003c\/summary\u003e\n\u003cp\u003eThe Pololu 4840-4847 series consists of six different gear ratio variants of the same 25D HP motor. Each variant provides different speed-torque characteristics: lower-numbered models offer higher speeds with lower torque, while higher-numbered models provide lower speeds with increased torque output. Select based on your application requirements: use lower ratios for speed-critical applications like fast-moving robots, and higher ratios for heavy-load systems requiring maximum torque.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I implement quadrature encoder reading on a microcontroller?\u003c\/summary\u003e\n\u003cp\u003eConnect the two encoder output channels to interrupt-capable GPIO pins on your microcontroller. Configure external interrupts to trigger on both rising and falling edges. In your interrupt handler, read both channel states to determine rotation direction: if channels are in the same state, rotation is in one direction; if opposite, rotation is in the other direction. Count interrupts to track total rotations, with 48 counts equaling one complete motor shaft revolution. This provides both speed and directional information for closed-loop control.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat motor driver specifications do I need for this gearmotor?\u003c\/summary\u003e\n\u003cp\u003eUse a motor driver capable of supplying the motor's stall current at 12V, typically 1-2 amperes depending on gear ratio. The driver must support PWM input for speed control and preferably provide bidirectional control (H-bridge) for forward-reverse operation. Recommended drivers include L298N, DRV8833, or similar dual-channel drivers. Ensure the driver includes flyback diodes for back-EMF protection and thermal management for continuous operation. For applications requiring higher current capacity, use industrial-grade drivers with integrated heat sinks.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen will I receive my order?\u003c\/summary\u003e\n\u003cp\u003eOrders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is your return and warranty policy?\u003c\/summary\u003e\n\u003cp\u003eWe 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.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre bulk discounts available?\u003c\/summary\u003e\n\u003cp\u003eYes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eWhy Buy from The Tech Depot\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Products: Sourced directly from authorized distributors with authentication\u003c\/li\u003e\n\u003cli\u003eExpert Team: Our technical team validates every product before listing\u003c\/li\u003e\n\u003cli\u003eFast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse\u003c\/li\u003e\n\u003cli\u003ePan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata\u003c\/li\u003e\n\u003cli\u003ePayment Options: COD, UPI, credit\/debit cards, net banking, EMI available\u003c\/li\u003e\n\u003cli\u003eTechnical Support: 24\/7 expert guidance via email and WhatsApp\u003c\/li\u003e\n\u003cli\u003eReturns: 7-day return policy on manufacturing defects only\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eBuy Pololu 4840\/4841\/4842\/4843\/4844\/4845\/4846\/4847 Metal Gearmotor 25D HP 12V with 48 CPR Encoder Online in India\u003c\/h2\u003e\n\u003cp\u003ePurchase the Pololu 4840\/4841\/4842\/4843\/4844\/4845\/4846\/4847 Metal Gearmotor 25D HP 12V with 48 CPR Encoder online at The Tech Depot, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on Pololu 4840\/4841\/4842\/4843\/4844\/4845\/4846\/4847 Metal Gearmotor 25D HP 12V with 48 CPR Encoder with fast shipping and expert support.\u003c\/p\u003e\n\u003cp\u003eOur team in Bengaluru is available 24\/7 to support your journey from product selection to project completion.\u003c\/p\u003e","brand":"The Tech Depot","offers":[{"title":"Default Title","offer_id":48743640203521,"sku":"TTD-8283","price":3001.28,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/1577\/3185\/files\/70d268058b019710bb3f4e58da8aa04f.jpg?v=1778060813","url":"https:\/\/techdepot.in\/products\/pololu-4840-4841-4842-4843-4844-4845-4846-4847-metal-gearmotor-25d-hp-12v-with-48-cpr-encoder","provider":"Tech Depot India","version":"1.0","type":"link"}