{"title":"Rotating torque sensors and torque measuring shafts","description":"\u003cp\u003eDynamic \u003cstrong\u003erotating torque sensors and torque measurement shafts\u003c\/strong\u003e are installed in the drivetrain and rotate with it. The signal is transmitted from the rotating part via slip rings or contactlessly. This allows you to measure torque during operation, optionally along with rotational speed and angle of rotation.\u003c\/p\u003e\n\u003ch2\u003eThe core question: how to get the signal off the rotating shaft\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003eThe strain gauges are located on the rotating measuring body. Their signal must be transmitted to a stationary part, and there are two ways to do this with significantly different characteristics.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eContact transmission via slip rings.\u003c\/strong\u003e Proven, technically simple, and less expensive to purchase. The transmission is broadband and also suitable for passive versions that output their mV\/V signal to an external amplifier. Disadvantages include wear on brushes and rings, limited rotational speed, potential contact noise, and maintenance requirements. For test benches with manageable run times and changing setups, this is often the more economical choice.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eContactless transmission.\u003c\/strong\u003e Energy and signal are transmitted inductively; there is no mechanical contact and therefore no wear. These versions run maintenance-free in continuous operation, tolerate higher speeds, and provide a noise-free signal. Because the electronics rotate with the shaft, they include the measuring amplifier and output a ready-to-use analog signal. The right choice for continuously running systems, high speeds, and serial test benches.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eRotational speed is a design criterion, not a detail\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eThe rated speed limits what you can do with a measurement shaft, and it depends on the bearings, transmission type, and balancing. Common measurement shafts are designed for several thousand revolutions per minute.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eCheck not only the operating speed but also the run-up, run-down, and potential overspeeds in the event of a failure. Also, pay attention to the balancing quality if you are working near the limit speed: An imbalance in the measurement string puts stress on the bearings, generates vibrations, and overlays the measurement signal.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eCouplings and alignment determine measurement quality\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eA measurement shaft is not a bearing. It must only absorb torsion, and any transverse force, axial force, or bending moment resulting from shaft misalignment will distort the result and damage the transducer. Therefore, the measurement shaft is always installed with two compensating couplings, one on each side.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eBellows couplings\u003c\/strong\u003e are torsionally stiff and transmit torque with almost zero backlash. This is important if you want to measure rapid changes in torque. They compensate for minor offsets but are sensitive to larger ones.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eDisk couplings\u003c\/strong\u003e tolerate more offset and higher speeds, but are somewhat more flexible.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eWhich type is suitable depends on the rated torque and speed; we will coordinate this with you and supply the appropriate couplings. An adjustable mount significantly facilitates alignment during installation, as it allows the measurement shaft to be adjusted to both connecting shafts.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eA point that is often overlooked: The measurement shaft changes the torsional stiffness of your drivetrain. In dynamic investigations, this can shift the torsional natural frequency of the setup. If you are investigating vibrations or irregularities, this should be taken into account in the design.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eMeasure rotational speed and angle of rotation simultaneously\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eVersions with an integrated encoder additionally provide rotational speed and angle of rotation. This is worthwhile for two reasons.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eMechanical power.\u003c\/strong\u003e Power is derived from torque and angular velocity. You therefore need both for efficiency, engine, and transmission tests, and both variables come from one device at the same time, without synchronization problems between two sensors.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eTorque-angle curves.\u003c\/strong\u003e In bolting technology, the final value is not the deciding factor, but rather the profile over the angle of rotation. An integrated angle encoder saves the need for a separate rotary encoder and its coupling.\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003eRotating torque sensors and torque measurement shafts: choosing the signal output\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003emV\/V passive\u003c\/strong\u003e is the most economical variant and requires an external \u003ca href=\"\/en\/collections\/dms-messverstaerker\"\u003emeasuring amplifier\u003c\/a\u003e. Useful if you already have measurement technology or are recording several channels together.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eAnalog with integrated amplifier\u003c\/strong\u003e, for example ±10 V, goes directly to a controller or measurement card. No additional device, no coordination.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eDigital via USB\u003c\/strong\u003e delivers the value directly to the computer, including software and selectable measurement rate. The most practical variant for laboratories, test fields, and mobile applications.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eFor fast processes such as starting torques, tooth engagement, or combustion irregularities, pay attention to the measurement rate: It must be able to map the process; otherwise, you will see a smoothed curve instead of the actual peaks.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eTypical applications\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eEngine and transmission test benches, efficiency measurements on drives, pumps and compressors, testing of electric drives and test runs in development, automatic screwdrivers and assembly systems, endurance and lifetime testing, process monitoring on spindles, agitators, and conveyors.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eIf a measurement shaft does not fit into the string\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eSometimes there is not enough installation length, the system cannot be separated, or the stiffness of the string must not be changed. In this case, measurement is carried out on the existing shaft: We apply \u003ca href=\"\/en\/pages\/dehnungsmessstreifen-dms-applikation\"\u003estrain gauges\u003c\/a\u003e directly to your component and transmit the signal contactlessly via \u003ca href=\"\/en\/collections\/wireless-telemetrie\"\u003etelemetry\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eIf nothing rotates during operation or if the reaction torque on the housing is to be recorded, \u003ca href=\"\/en\/collections\/drehmomentsensoren-statisch\"\u003estatic torque sensors\u003c\/a\u003e are the simpler and cheaper solution.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eCalibration and special designs\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eSo that you measure in Newton meters and not in mV\/V, we can calibrate the measurement chain \u003ca href=\"\/en\/pages\/kalibrierung-waegezelle-kraftmessdose-kraftaufnehmer-iso17025\"\u003eaccording to ISO 17025\u003c\/a\u003e in our own laboratory upon request. If no standard design fits, we design and manufacture \u003ca href=\"\/en\/pages\/kundenspezifische-kraftaufnehmer-kraftmessdosen\"\u003ecustom transducers\u003c\/a\u003e; we supply complete setups via our \u003ca href=\"\/en\/pages\/prufstandsbau\"\u003etest bench construction\u003c\/a\u003e department.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eTell us the rated torque, speed, shaft connection, and available installation length, and our engineers will suggest the appropriate measurement shaft along with the couplings.\u003c\/p\u003e","products":[{"product_id":"drehmomentsensor-dynamisch-rt2","title":"MDAA Rotating Torque Sensor RT2","description":"\u003ch1\u003eRotating Torque Sensor MDAA (RT2) from 0.5 to 5000 N·m\u003c\/h1\u003e\n\u003cp\u003eThe MDAA is a rotating torque sensor for test benches, powertrains, and calibration tasks. Signal transmission is via contact; depending on the version, the sensor provides a bridge signal of 2 mV\/V (RT2) or an amplified analog signal of ±10 V (RT2A). The rated speed is 4000 min⁻¹.\u003c\/p\u003e\n\u003ch3\u003eKey features at a glance\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eTwelve measuring ranges:\u003c\/b\u003e 0.5 · 2.5 · 5 · 10 · 25 · 50 · 100 · 250 · 500 · 1000 · 3000 · 5000 N·m in three sizes with shaft diameters 16h6, 25h6, and 50h6.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eTwo signal variants:\u003c\/b\u003e RT2 with 2 mV\/V (1 mV\/V at 0.5 N·m) or RT2A with ±10 V and a bandwidth of 3.3 kHz.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eAccuracy:\u003c\/b\u003e Linearity and hysteresis ≤ ±0.2 %, temperature effect on zero point and sensitivity each ≤ ±0.02 % per 1 °C.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eRobust design:\u003c\/b\u003e Measuring body made of stainless steel, housing made of aluminum, protection class IP40 according to EN 60529.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eProcess connection:\u003c\/b\u003e Cylindrical shaft with keyway according to UNI 6604 (Form A 5×5 \/ 8×7 \/ 14×9 per shaft diameter), optional square coupling according to UNI ISO 1174-1.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eOptional incremental encoder:\u003c\/b\u003e Integrated, Line Driver RS422, 3520 or 8000 pulses per revolution – for speed and power measurement.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical data at a glance\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eOutput:\u003c\/b\u003e 2 mV\/V (RT2, at 0.5 N·m 1 mV\/V) or ±10 V (RT2A)\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eSupply:\u003c\/b\u003e 1…15 V, max. 18 V (RT2) · 15…24 V, max. 28 V at max. 30 mA current consumption (RT2A)\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eResistors:\u003c\/b\u003e Input 800 Ω ±20, Output 700 Ω ±5 (RT2) · Load resistance min. 3 kΩ (RT2A) · Insulation resistance \u0026gt; 2 GΩ\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eSensitivity tolerance:\u003c\/b\u003e ≤ ±0.2 % · Zero position ≤ ±0.5 %\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eTemperatures:\u003c\/b\u003e Reference +23 °C · Operating -10…+70 °C · Storage -20…+80 °C\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eMechanical limits:\u003c\/b\u003e Operating torque 100 %FS · Limit torque 150 %FS · Breaking torque \u0026gt; 300 %FS · permissible oscillation range 70 %FS\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eRated speed:\u003c\/b\u003e 4000 min⁻¹\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eTorsional stiffness:\u003c\/b\u003e 0.78 to 377 kNm\/rad per measuring range · Moment of inertia 28 to 1475 kg·mm²\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eConnection:\u003c\/b\u003e M12x1, 5-pin connector, with 3 m molded PVC cable; with encoder option 12-pin and 2 m cable\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eWeight:\u003c\/b\u003e 0.65…1 kg or approx. 6 kg depending on size\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eConformity:\u003c\/b\u003e CE, RoHS, REACH · applied standards EN 61326-1 (2013) and EN 61010-1 (2013) · Quality system according to EN ISO 9001 · Manufacturer's declaration of conformity from 11.04.2014\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eOn request:\u003c\/b\u003e Calibration protocol and ACCREDIA calibration certificate according to ISO\/IEC 17025, for clockwise and counter-clockwise rotation\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3\u003eNecessary accessories\u003c\/h3\u003e\n\u003cp\u003eFor correct installation, two shaft couplings (MAAA, FLEXSTEEL or METALFLEX) and an adjustable stand are required. The couplings are mounted together with the sensor outside the machine and connected to a display so that no undesirable torque, bending, or tensile stress occurs during alignment.\u003c\/p\u003e\n\u003cp\u003eNote: For 0.5 N·m and 2.5 N·m, ACCREDIA calibration cannot be performed in LAT Laboratory No. 93; it is possible upon request via another accredited laboratory.\u003c\/p\u003e","brand":"octogon Shop","offers":[{"title":"Default Title","offer_id":57245601431878,"sku":null,"price":0.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/5558\/6374\/files\/MDAA_RT2_produkt_b59e4301-dae0-4d3d-9aec-4d72860fcbbf.png?v=1788384889"},{"product_id":"drehmomentsensor-dynamisch-rt8","title":"MDAB Rotating Torque Sensor RT8","description":"\u003ch1\u003eNon-contact torque sensor MDAB (RT8) up to 10,000 rpm\u003c\/h1\u003e\n\u003cp\u003eThe MDAB is a rotating torque sensor with non-contact signal transmission. Because there are no slip rings to wear out, it is suitable for continuous operation and high speeds: up to 10,000 rpm in measuring ranges up to 500 N·m and up to 9500 rpm from 1000 N·m. The output is an amplified analog signal of ±10 V.\u003c\/p\u003e\n\u003ch3\u003eKey features at a glance\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eNon-contact transmission:\u003c\/b\u003e no slip ring, no mechanical wear in the signal path.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eTwelve measuring ranges:\u003c\/b\u003e 0.5 · 2.5 · 5 · 10 · 25 · 50 · 100 · 250 · 500 · 1000 · 3000 · 5000 N·m in three sizes with shaft diameters 16h6, 25h6 and 50h6.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eHigh dynamics:\u003c\/b\u003e bandwidth 1 kHz, sampling rate 3 kHz, output ±10 Vdc.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eAccuracy:\u003c\/b\u003e Linearity and hysteresis ≤ ±0.2 %, temperature effect on zero point and characteristic value each ≤ ±0.02 % per 1 °C.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eRobust construction:\u003c\/b\u003e measuring body made of stainless steel, housing made of aluminum, protection class IP40 according to EN 60529.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eOptions:\u003c\/b\u003e integrated incremental encoder (Line Driver RS422) and square drive coupling according to UNI ISO 1174-1, each to be ordered with the sensor.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical data at a glance\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eOutput:\u003c\/b\u003e ±10 Vdc · Load resistance min. 3 kΩ\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eSupply:\u003c\/b\u003e 17…24 V, max. 28 V · Current consumption max. 60 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eBandwidth \/ sampling rate:\u003c\/b\u003e 1 kHz \/ 3 kHz · Insulation resistance \u0026gt; 2 GΩ\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eCharacteristic value tolerance:\u003c\/b\u003e ≤ ±0.2 % · Zero position ≤ ±0.5 %\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eTemperatures:\u003c\/b\u003e Reference +23 °C · Operating -10…+70 °C · Storage -20…+80 °C\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eMechanical limits:\u003c\/b\u003e Operating torque 100 %FS · Limit torque 150 %FS · Breaking torque \u0026gt; 300 %FS · Permissible oscillation range 70 %FS\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eRated speed:\u003c\/b\u003e 10,000 rpm up to 500 N·m, 9500 rpm from 1000 N·m – the shaft couplings limit the speed of the system to 4000 rpm\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eTorsional stiffness:\u003c\/b\u003e 0.78 to 377 kNm\/rad per measuring range · Moment of inertia 28 to 1475 kg·mm²\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eProcess connection:\u003c\/b\u003e cylindrical shaft with keyway according to UNI 6604, optional square drive coupling according to UNI ISO 1174-1\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eConnection:\u003c\/b\u003e M12x1, 5-pin connector, with 3 m molded PVC cable; with encoder option 12-pin and 2 m cable\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eWeight:\u003c\/b\u003e 0.65…1 kg (0.5…500 N·m) · approx. 6 kg (1000…5000 N·m)\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eConformity:\u003c\/b\u003e CE and RoHS according to labeling on manufacturer datasheet and type plate · Quality system certified according to EN ISO 9001:2015 (Dasa-Rägister, IQ-1100-01)\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cb\u003eOn request:\u003c\/b\u003e Calibration protocol and ACCREDIA calibration certificate according to ISO\/IEC 17025, each clockwise and counterclockwise\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3\u003eNecessary accessories\u003c\/h3\u003e\n\u003cp\u003eFor correct installation, two shaft couplings (MAAA, FLEXSTEEL or METALFLEX) and an adjustable stand are required. The couplings are designed for 4000 rpm and thus limit the speed of the system. They are mounted together with the sensor outside the machine and connected to a display so that no unwanted torque, bending, or tensile stress occurs during alignment.\u003c\/p\u003e\n\u003cp\u003eNotes: For 0.5 N·m and 2.5 N·m, ACCREDIA calibration cannot be performed in LAT laboratory No. 93; it is possible on request through another accredited laboratory. The manufacturer does not publish a declaration of conformity for the RT8 – it must be requested.\u003c\/p\u003e","brand":"octogon Shop","offers":[{"title":"Default Title","offer_id":57245601464646,"sku":null,"price":0.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/5558\/6374\/files\/MDAB_RT8_produkt_7a86eb80-3bf6-4ca6-a7d3-4b2e4a9a3c49.png?v=1788385702"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/5558\/6374\/collections\/MDAA_RT2_Produktbild.webp?v=1789567767","url":"https:\/\/octogon-sensors.com\/en\/collections\/rotierende-drehmomentsensoren-drehmomentmesswellen.oembed","provider":"octogon GmbH","version":"1.0","type":"link"}