{"product_id":"pololu-1581-1582-1584-1585-1586-1587-1588-1589-1590-1591-metal-gearmotor-25d-lp-6v-without-encoder","title":"Pololu 1581\/1582\/1584\/1585\/1586\/1587\/1588\/1589\/1590\/1591 Metal Gearmotor 25D LP 6V - Without Encoder","description":"\u003cmeta name=\"description\" content=\"Buy Pololu 1581\/1582\/1584\/1585\/1586\/1587\/1588\/1589\/1590\/1591 Metal Gearmotor 25D LP 6V - Without Encoder online in India at best price from The Engineer Store, Bengaluru. Authentic product, 7-day warranty on manufacturing defects, fast delivery across India.\"\u003e\n\n\u003ch1\u003ePololu 1581\/1582\/1584\/1585\/1586\/1587\/1588\/1589\/1590\/1591 Metal Gearmotor 25D LP 6V - Without Encoder\u003c\/h1\u003e\n\n\u003cp\u003eThe Pololu 25D LP metal gearmotor is a compact, high-torque drive solution featuring a brushed DC motor coupled with a precision spur gearbox, delivering consistent performance across multiple gear ratios from 25:1 to 1000:1. Professional roboticists, autonomous vehicle developers, and industrial automation engineers rely on this motor series for applications requiring reliable power transmission with minimal backlash and exceptional durability in demanding environments. This encoder-free variant solves the challenge of achieving high torque output in space-constrained designs while maintaining the mechanical integrity necessary for long-term field deployment without the added complexity and cost of integrated feedback systems.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\n\u003cp\u003eThe Pololu 25D LP gearmotor combines a high-efficiency brushed DC motor with a metal spur gearbox, engineered to deliver substantial torque multiplication while maintaining compact dimensions suitable for mobile robotics, conveyor systems, and precision mechanical applications. The motor operates on 6V nominal voltage, drawing minimal current during no-load conditions and scaling responsively under load, making it ideal for battery-powered systems where power efficiency directly impacts operational runtime. The metal gearbox construction utilizes hardened steel gears with precision-cut teeth, ensuring smooth power transmission, reduced noise generation, and extended service life compared to plastic gearbox alternatives.\u003c\/p\u003e\n\n\u003cp\u003eThis particular variant is offered without an integrated encoder, providing maximum flexibility for projects where rotational feedback is either unnecessary or implemented through external sensing solutions. The motor shaft features a D-shaped profile for secure coupling to wheels, pulleys, or custom mechanical interfaces, while the compact 25D form factor integrates seamlessly into space-optimized designs. The absence of encoder components reduces weight, eliminates wiring complexity, and decreases overall system cost, making this configuration ideal for applications where open-loop speed control or simple mechanical feedback suffices.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\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 Spur Gearbox, Encoder-Free\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\/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\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd\u003e6V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo-Load Speed Range\u003c\/td\u003e\n\u003ctd\u003e50 to 1000 RPM depending on gear ratio selection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStall Torque Range\u003c\/td\u003e\n\u003ctd\u003eUp to 1000 oz-in depending on gear ratio configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor Shaft\u003c\/td\u003e\n\u003ctd\u003eD-shaped profile for secure mechanical coupling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGearbox Type\u003c\/td\u003e\n\u003ctd\u003eMetal spur gearbox with hardened steel gears\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Gear Ratios\u003c\/td\u003e\n\u003ctd\u003e25:1, 50:1, 100:1, 150:1, 200:1, 250:1, 500:1, 1000:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eHigh-torque metal spur gearbox delivering up to 1000 oz-in stall torque in maximum reduction configuration, enabling heavy-load applications including mobile robot chassis propulsion and industrial conveyor drive systems\u003c\/li\u003e\n\u003cli\u003eCompact 25D form factor measuring approximately 25mm in diameter, fitting seamlessly into space-constrained designs such as small autonomous vehicles, robotic arms, and miniaturized mechanical systems\u003c\/li\u003e\n\u003cli\u003eBrushed DC motor with low electrical noise and simple PWM speed control compatibility, allowing straightforward integration with microcontroller-based drive circuits without complex firmware requirements\u003c\/li\u003e\n\u003cli\u003eEncoder-free design eliminating rotational feedback complexity, reducing system weight and cost while maintaining mechanical reliability for applications utilizing open-loop control or external sensing solutions\u003c\/li\u003e\n\u003cli\u003eHardened steel gear construction providing exceptional durability, minimal backlash, and extended operational lifespan in continuous-duty industrial and field robotics applications\u003c\/li\u003e\n\u003cli\u003eD-shaped motor shaft enabling secure mechanical coupling to wheels, pulleys, and custom drive interfaces without slippage under load conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eApplications and Use Cases\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eMobile robotics platforms including line-following robots, obstacle-avoidance systems, and autonomous ground vehicles requiring reliable torque delivery with minimal encoder overhead for basic speed control\u003c\/li\u003e\n\u003cli\u003eIndustrial automation equipment such as conveyor belt drives, material handling systems, and production line actuators demanding consistent torque output and extended service intervals in harsh factory environments\u003c\/li\u003e\n\u003cli\u003eRobotic manipulators and articulated arm systems utilizing multiple gearmotor units for joint actuation, where encoder-free variants reduce wiring complexity and system weight in multi-axis configurations\u003c\/li\u003e\n\u003cli\u003eEducational robotics platforms and STEM learning environments where simplified motor control without encoder feedback reduces student learning curve while maintaining sufficient performance for competition-level projects\u003c\/li\u003e\n\u003cli\u003ePrecision mechanical systems including winch drives, lifting mechanisms, and rotational positioning applications where high torque multiplication and mechanical reliability supersede the need for rotational feedback\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow to Use\u003c\/h2\u003e\n\n\u003cp\u003eBegin by selecting the appropriate gear ratio for your application based on required torque and speed characteristics. Connect the motor leads to your power supply through a motor driver circuit capable of handling the motor's stall current, typically ranging from 1 to 3 amperes depending on gear ratio selection. For PWM speed control, apply a PWM signal to the motor driver input, with duty cycle directly proportional to motor speed. Secure the motor mechanically using the mounting bracket provisions, ensuring the D-shaped shaft couples securely to your driven load through a shaft collar or custom coupling mechanism to prevent slippage under operating torque.\u003c\/p\u003e\n\n\u003cp\u003eImplement appropriate mechanical protection by installing a freewheel diode across the motor terminals to suppress back-EMF spikes during rapid deceleration or direction reversal, protecting your motor driver circuitry from voltage transients. Monitor motor temperature during extended operation, ensuring adequate cooling if operating continuously at high duty cycles. For applications requiring speed feedback, implement external sensing solutions such as infrared optical sensors or Hall-effect proximity sensors mounted to detect shaft rotation, maintaining the encoder-free design philosophy while enabling closed-loop control if necessary.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the various Pololu 25D LP model numbers (1581-1591)?\u003c\/summary\u003e\n\u003cp\u003eThe model numbers 1581 through 1591 represent different gear ratio configurations of the same physical motor assembly. Each model delivers a different combination of output speed and torque, with lower model numbers typically offering higher speeds and lower torques, while higher model numbers provide lower speeds with proportionally increased torque multiplication. Consult the specific datasheet for your model number to confirm exact gear ratio, no-load speed, and stall torque specifications before integration into your project.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this motor with a simple relay circuit or does it require a dedicated motor driver?\u003c\/summary\u003e\n\u003cp\u003eWhile a relay can provide on-off switching, a dedicated motor driver circuit is strongly recommended for optimal performance and component protection. Motor drivers provide current limiting, back-EMF suppression, and enable PWM speed control functionality. Direct relay switching exposes your control circuitry to voltage spikes and can damage microcontroller pins. Use an H-bridge driver such as the L298N or similar for bidirectional control, or a simple MOSFET circuit for unidirectional applications.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs this motor suitable for continuous-duty operation at rated voltage?\u003c\/summary\u003e\n\u003cp\u003eYes, the Pololu 25D LP is designed for continuous operation at nominal 6V. However, motor temperature will rise under sustained high-load conditions. Monitor temperature using an infrared thermometer, and ensure ambient cooling or active heat dissipation if operating in enclosed environments. Reduce duty cycle or implement thermal management solutions if motor temperature exceeds 80 degrees Celsius during extended operation to prevent premature bearing wear and winding degradation.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I reverse the motor direction?\u003c\/summary\u003e\n\u003cp\u003eReverse motor direction by reversing the polarity of the applied voltage using an H-bridge motor driver circuit. This allows bidirectional control through logic signals from your microcontroller. Simply reversing the motor leads manually also works for static direction changes, but electronic reversal via motor driver provides safer, faster switching suitable for dynamic applications.\u003c\/p\u003e\n\u003c\/details\u003e\n\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\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\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 Engineer Store\u003c\/h2\u003e\n\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 1581\/1582\/1584\/1585\/1586\/1587\/1588\/1589\/1590\/1591 Metal Gearmotor 25D LP 6V - Without Encoder Online in India\u003c\/h2\u003e\n\n\u003cp\u003ePurchase the Pololu 1581\/1582\/1584\/1585\/1586\/1587\/1588\/1589\/1590\/1591 Metal Gearmotor 25D LP 6V - Without Encoder online at The Engineer Store, 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 1581\/1582\/1584\/1585\/1586\/1587\/1588\/1589\/1590\/1591 Metal Gearmotor 25D LP 6V - Without Encoder with fast shipping and expert support.\u003c\/p\u003e\n\n\u003cp\u003eOur team in Bengaluru is available 24\/7 to support your journey from product selection to project completion.\u003c\/p\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":43856857432227,"sku":"TES-EV00082536","price":2586.19,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/4479\/7091\/products\/1581-228x228.jpg?v=1704281913","url":"https:\/\/www.theengineerstore.in\/zh-hans\/products\/pololu-1581-1582-1584-1585-1586-1587-1588-1589-1590-1591-metal-gearmotor-25d-lp-6v-without-encoder","provider":"The Engineer Store","version":"1.0","type":"link"}