{"product_id":"kpower-dhv821-servo-motor","title":"Kpower DHV821 Coreless Digital Servo, 0.03 s\/60° at 7.4 V, for R\/C Cars and Aircraft","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe Kpower DHV821 is an HV coreless digital servo for R\/C cars, aircraft and controlled mechanisms in robotics and smart-home projects. Its 0.03 s\/60° no-load speed at 7.4 V supports fast positioning, while metal gears and an aluminum-alloy case provide its mechanical construction. Measuring 40 × 20 × 39 mm and weighing 72 g, it operates from 4.8–8.4 V and has a customizable 120° travel range.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-speed digital servo with a coreless motor.\u003c\/li\u003e\n\u003cli\u003eMetal gears, an aluminum-alloy case and two ball bearings (2BB).\u003c\/li\u003e\n\u003cli\u003ePotentiometer position sensing.\u003c\/li\u003e\n\u003cli\u003e25T, Ø5.9 mm splined output shaft with a central threaded opening.\u003c\/li\u003e\n\u003cli\u003eMounting tabs with four open-ended mounting slots.\u003c\/li\u003e\n\u003cli\u003e120° travel angle range, customizable.\u003c\/li\u003e\n\u003cli\u003eListed control protocols: PWM, TTL and RS-485.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eDHV821\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eServo type\u003c\/td\u003e\n\u003ctd\u003eHV coreless digital servo; high-speed type\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStall torque\u003c\/td\u003e\n\u003ctd\u003e5.9 kg·cm at 7.4 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated torque\u003c\/td\u003e\n\u003ctd\u003e1.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo-load speed\u003c\/td\u003e\n\u003ctd\u003e0.03 s\/60° at 7.4 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e72 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e40 × 20 × 39 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTravel angle range\u003c\/td\u003e\n\u003ctd\u003e120°; customizable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating voltage\u003c\/td\u003e\n\u003ctd\u003e4.8–8.4 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHorn gear spline\u003c\/td\u003e\n\u003ctd\u003e25T, Ø5.9 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput-shaft detail\u003c\/td\u003e\n\u003ctd\u003eSplined shaft with central threaded opening\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eMounting tabs with four open-ended slots\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGear material\u003c\/td\u003e\n\u003ctd\u003eMetal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor\u003c\/td\u003e\n\u003ctd\u003eCoreless motor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtocols\u003c\/td\u003e\n\u003ctd\u003ePWM, TTL, RS-485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo-load current\u003c\/td\u003e\n\u003ctd\u003e3100 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePosition sensor\u003c\/td\u003e\n\u003ctd\u003ePotentiometer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase material\u003c\/td\u003e\n\u003ctd\u003eAluminum alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBall bearings\u003c\/td\u003e\n\u003ctd\u003e2BB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorking frequency\u003c\/td\u003e\n\u003ctd\u003e50–333 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating temperature\u003c\/td\u003e\n\u003ctd\u003e−10 to 50 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIP rating\u003c\/td\u003e\n\u003ctd\u003eIP42\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eR\/C cars and aircraft:\u003c\/strong\u003e Actuate steering and control linkages where the 0.03 s\/60° no-load speed at 7.4 V is useful for rapid position changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobotic mechanisms:\u003c\/strong\u003e Position joint or linkage mechanisms using potentiometer feedback and a splined output shaft for mechanical coupling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmart-home mechanisms:\u003c\/strong\u003e Move compact linkages within the servo's 120° travel range, with mounting tabs for securing the housing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedical-device mechanism development:\u003c\/strong\u003e Provide controlled angular motion for compact linkages using a coreless motor and potentiometer position sensing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eDocuments\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-dhv-821-servo-motor-drawing.pdf?v=1792464401\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eKpower DHV821 Drawing — Drawing (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-dmc-026-servo-motor-ocservo-ocs-d-9501-drawing.pdf?v=1792378920\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eOCservo OCS D9501 Drawing — Ocservo Ocs D 9501 Drawing (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0673\/6848\/5000\/files\/OCServo-OCS-D9501_-Manuel.pdf?v=1778064252\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eOCServo OCS D9501 Manuel — Ocservo Ocs D 9501 Manuel (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0673\/6848\/5000\/files\/Kpower_Servo_Product_Manual-3.pdf?v=1781066839\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eKpower Servo 3 — Manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/hexfellow-hexmotor-4342-p-motor-ocservo-ocs-351-can-drawing.pdf?v=1790605115\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eOCServo OCS 351CAN Drawing — Ocservo Ocs 351 Can Drawing (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eProduct Videos\u003c\/h2\u003e\n\u003ch2\u003eVisual Details\u003c\/h2\u003e\u003ch3\u003eProduct Video\u003c\/h3\u003e\u003cfigure class=\"tophitek-product-video-block\"\u003e\u003cvideo autoplay=\"autoplay\" class=\"tophitek-product-video\" controls=\"controls\" loop=\"loop\" muted=\"\" playsinline=\"\" src=\"https:\/\/cdn.shopify.com\/videos\/c\/o\/v\/53e3414d26bc41e5a42971fa1d004e8a.mp4\" style=\"display:block;width:auto;max-width:100%;height:auto;margin:0 auto\"\u003eYour browser does not support the video tag.\u003c\/video\u003e\u003c\/figure\u003e\u003cfigure class=\"tophitek-product-video-block\"\u003e\u003cvideo autoplay=\"autoplay\" class=\"tophitek-product-video\" controls=\"controls\" loop=\"loop\" muted=\"\" playsinline=\"\" src=\"https:\/\/cdn.shopify.com\/videos\/c\/o\/v\/6bc68e12069e4752a49d80aec7c24720.mp4\" style=\"display:block;width:auto;max-width:100%;height:auto;margin:0 auto\"\u003eYour browser does not support the video tag.\u003c\/video\u003e\u003c\/figure\u003e\n\u003ch3\u003eApplication Examples\u003c\/h3\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-dhv821-coreless-digital-servo-0-29c9334754.webp?v=1792464715\" alt=\"Kpower DHV821 servo with splined output shaft, mounting tabs and application labels\" loading=\"lazy\"\u003e\u003cfigcaption\u003eThe DHV821 has a splined output shaft with a central threaded opening. The Kpower DHV821 is labeled as an HV coreless digital servo.\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-dhv821-coreless-digital-servo-0-9fe3827f0a.webp?v=1792464748\" alt=\"General Kpower application grid for robotics, automation, RC models and other industries\" loading=\"lazy\"\u003e\u003cfigcaption\u003eKpower application grid covering robotics, automation, RC models, drones and other industries\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003ch3\u003eOptions and Model Comparison\u003c\/h3\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg alt=\"DHV821, DHV822, DHV823, DHV826 and DHV828 servo comparison chart\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0673\/6848\/5000\/files\/Kpower-DHV828-des-2.jpg?v=1780195394\"\u003e\u003cfigcaption\u003eThe comparison chart specifies dimensions of 40 × 20 × 39 mm for the listed DHV821, DHV822, DHV823, DHV826 and DHV828 models. The comparison chart specifies a weight of 72 g for the listed DHV821, DHV822, DHV823, DHV826 and DHV828 models.\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003ch3\u003eSpecifications and Performance\u003c\/h3\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-dhv821-coreless-digital-servo-0-5175f76892.webp?v=1792464720\" alt=\"DHV821 specification panel with 7.4 V torque and speed ratings and metal gear detail\" loading=\"lazy\"\u003e\u003cfigcaption\u003eThe DHV821 torque is 5.9 kg·cm at 7.4 V. The DHV821 speed is 0.03 seconds per 60° at 7.4 V.\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-dhv821-coreless-digital-servo-0-bb6c15dfa1.webp?v=1792464724\" alt=\"General servo-selection reference for rotation, speed, voltage and dead band\" loading=\"lazy\"\u003e\u003cfigcaption\u003eGeneral servo-selection reference covering rotation, speed, voltage and dead band\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003ch3\u003eAdditional Product Details\u003c\/h3\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-dhv821-coreless-digital-servo-0-f1a1de17c0.webp?v=1792464728\" alt=\"Servo-horn shapes labeled Flat, Cross, Round, Star and Single\" loading=\"lazy\"\u003e\u003cfigcaption\u003eFive servo-horn shapes labeled Flat, Cross, Round, Star and Single\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-dhv821-coreless-digital-servo-0-21d54a31a8.webp?v=1792464752\" alt=\"ODM service workflow from requirements assessment through mass production\" loading=\"lazy\"\u003e\u003cfigcaption\u003eODM development workflow from requirements assessment to mass production\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003ch3\u003eSetup and Use\u003c\/h3\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-dhv821-coreless-digital-servo-0-3d8af74ad3.webp?v=1792464732\" alt=\"Generic servo pulse-width diagram mapping input pulses to shaft angles\" loading=\"lazy\"\u003e\u003cfigcaption\u003eServo pulse-width reference mapping five input pulses to output-shaft angles\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-dhv821-coreless-digital-servo-0-a506c2a0e5.webp?v=1792464740\" alt=\"CLS88WP torque, speed and current example chart at 7.4 V\" loading=\"lazy\"\u003e\u003cfigcaption\u003eCLS88WP example torque chart at 7.4V with operating-duty guidance\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg alt=\"Exploded servo assembly and checklist of materials, sensors, motors and protocols\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0673\/6848\/5000\/files\/Kpower-DHV026-des-2.jpg?v=1780192112\"\u003e\u003cfigcaption\u003eExploded servo assembly beside a checklist of materials, motor types, sensors and protocols\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003ch3\u003eFeatures and Design\u003c\/h3\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-dhv821-coreless-digital-servo-0-aded8d4f8d.webp?v=1792464736\" alt=\"Custom servo development examples with housings, gears, shafts and connectors\" loading=\"lazy\"\u003e\u003cfigcaption\u003eCustom servo development graphic with housing, gear, shaft and connector examples\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003ch3\u003eInterfaces and Connections\u003c\/h3\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-dhv821-coreless-digital-servo-0-8b38fa5b86.webp?v=1792464744\" alt=\"Generic three-wire servo diagram with brown ground, red supply and orange signal\" loading=\"lazy\"\u003e\u003cfigcaption\u003eThree-wire servo connector with brown ground, red supply and orange signal leads\u003c\/figcaption\u003e\u003c\/figure\u003e","brand":"Kpower","offers":[{"title":"DHV821","offer_id":67819918164192,"sku":"KPO-DCE34313","price":103.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/3210\/3904\/files\/kpower-dhv821-servo-motor-bare-shaf-460e57e414-01.webp?v=1792464349","url":"https:\/\/rcdrone.top\/sv\/products\/kpower-dhv821-servo-motor","provider":"RCDrone","version":"1.0","type":"link"}