{"product_id":"siemens-1fk7081-2af71-1qb0-servo-motor","title":"Siemens 1FK7081-2AF71-1QB0 SIMOTICS S 1FK7-CT 2.7 kW 12 Nm Holding Brake Servo Motor","description":"\u003cp\u003eThe Siemens 1FK7081-2AF71-1QB0 is a SIMOTICS S 1FK7-CT synchronous servo motor rated 2.7 kW with 12 Nm standstill torque at 100K and a 3,000 rpm rated speed, built with an integrated holding brake. It runs on a 600 V DC link, uses natural cooling, and carries an IP64 enclosure with an absolute 20-bit single-turn DRIVE-CLiQ encoder (AS20DQI).\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003e1FK7081-2AF71-1QB0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSiemens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eSIMOTICS S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct designation\u003c\/td\u003e\n\u003ctd\u003e1FK7-CT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated power (PN)\u003c\/td\u003e\n\u003ctd\u003e2.7 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC link voltage (UDC)\u003c\/td\u003e\n\u003ctd\u003e600 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandstill torque (M0) at 100K\u003c\/td\u003e\n\u003ctd\u003e12 Nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated speed (NN)\u003c\/td\u003e\n\u003ctd\u003e3,000 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of poles\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated current\u003c\/td\u003e\n\u003ctd\u003e6.8 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMoment of inertia\u003c\/td\u003e\n\u003ctd\u003e23.500 kgcm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEfficiency\u003c\/td\u003e\n\u003ctd\u003e93.0 %\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTorque constant\u003c\/td\u003e\n\u003ctd\u003e1.38 Nm\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage constant at 20°C\u003c\/td\u003e\n\u003ctd\u003e88.5 V\/1000 min⁻¹\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWinding resistance at 20°C\u003c\/td\u003e\n\u003ctd\u003e0.42 Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRotating field inductance\u003c\/td\u003e\n\u003ctd\u003e7.7 mH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical time constant\u003c\/td\u003e\n\u003ctd\u003e18.20 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMechanical time constant\u003c\/td\u003e\n\u003ctd\u003e1.35 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermal time constant\u003c\/td\u003e\n\u003ctd\u003e45 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft torsional stiffness\u003c\/td\u003e\n\u003ctd\u003e76,000 Nm\/rad\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight\u003c\/td\u003e\n\u003ctd\u003e15.9 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft height\u003c\/td\u003e\n\u003ctd\u003e80 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCooling\u003c\/td\u003e\n\u003ctd\u003eNatural cooling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDegree of protection\u003c\/td\u003e\n\u003ctd\u003eIP64\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing color\u003c\/td\u003e\n\u003ctd\u003eAnthracite (RAL 7016)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEncoder\u003c\/td\u003e\n\u003ctd\u003eAbsolute single-turn, 20-bit, DRIVE-CLiQ interface (AS20DQI)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHolding brake\u003c\/td\u003e\n\u003ctd\u003eIntegrated holding brake\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft\u003c\/td\u003e\n\u003ctd\u003eFeather key, tolerance N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower connector\u003c\/td\u003e\n\u003ctd\u003e1, rotatable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eIMB5 (IM V1, IM V3), flange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eSelection Notes\u003c\/h2\u003e\u003cp\u003eThe holding brake adds rotor mass, so inertia rises from the brakeless variant's 20.000 kgcm² to 23.500 kgcm² and shaft torsional stiffness drops from 109,000 to 76,000 Nm\/rad — factor that into servo tuning if the axis needs high bandwidth. Choose this variant for vertical or gravity-loaded axes, where the brake holds the 12 Nm standstill torque during an E-stop or power loss instead of relying on the drive's active current. Rated current, speed, and power stay identical to the non-brake motor, so drive sizing does not change.\u003c\/p\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cp\u003eTypical use: vertical Z-axes, lift stations, and any DRIVE-CLiQ servo axis on SINAMICS S120\/S210 where the load must not drop when power is removed.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":53960348336411,"sku":"1FK7081-2AF71-1QB0","price":2192.49,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0903\/7722\/4475\/files\/siemens-1fk7081-2af71-1qb0-1fk7-ct-servo-motor.png?v=1789757854","url":"https:\/\/stoklink.com\/products\/siemens-1fk7081-2af71-1qb0-servo-motor","provider":"Stoklink","version":"1.0","type":"link"}