A torque sensor, torque transducer or torque meter is actually a device for measuring and recording the torque on a rotating system, such as an engine, crankshaft, gearbox, transmission, rotor, a bicycle crank or torque transducer. Static torque is fairly very easy to measure. Dynamic torque, on the contrary, can be difficult to measure, as it generally requires transfer of some effect (electric, hydraulic or magnetic) through the shaft being measured to a static system.
One method to achieve this would be to condition the shaft or a member attached to the shaft with a series of permanent magnetic domains. The magnetic characteristics of such domains will vary in accordance with the applied torque, and thus could be measured using non-contact sensors. Such magnetoelastic torque sensors are usually used for in-vehicle applications on racecars, automobiles, aircraft, and hovercraft.
Commonly, torque sensors or torque transducers use strain gauges applied to a rotating shaft or axle. With this method, a way to power the strain gauge bridge is necessary, in addition to a way to have the signal through the rotating shaft. This is often accomplished using slip rings, wireless telemetry, or rotary transformers. Newer varieties of torque transducers add conditioning electronics plus an A/D converter towards the rotating shaft. Stator electronics then browse the digital signals and convert those signals to your high-level analog output signal, including /-10VDC.
A far more recent development is the use of SAW devices connected to the shaft and remotely interrogated. The stress on these tiny devices because the shaft flexes can be read remotely and output without resorting to attached electronics on the shaft. The probable first utilization in volume will be in the automotive field as, of May 2009, Schott announced it has a SAW sensor package viable for in vehicle uses.
A different way to triaxial load cell is through twist angle measurement or phase shift measurement, whereby the angle of twist as a result of applied torque is measured by utilizing two angular position sensors and measuring the phase angle between them. This procedure is utilized within the Allison T56 turboprop engine.
Finally, (as described inside the abstract for people Patent 5257535), in the event the mechanical system involves a right angle gearbox, then your axial reaction force gone through by the inputting shaft/pinion can be related to the torque felt by the output shaft(s). The axial input stress must first be calibrated from the output torque. The input stress can be nanzqz measured via strain gauge measurement from the input pinion bearing housing. The output torque is readily measured utilizing a static torque meter.
The torque sensor can function such as a mechanical fuse and is a key component to get accurate measurements. However, improper installing of the torque sensor can harm the device permanently, costing time and money. Hence, the torque sensor needs to be properly installed to make certain better performance and longevity.
The performance and longevity in the compression load cell along with its reading accuracy will be affected by the appearance of the driveline. The shaft becomes unstable at the critical speed in the driveline and results in torsional vibration, which can harm the torque sensor. It really is essential to direct the strain to an exact point for accurate torque measurement. This point is typically the weakest point of the sensor structure. Hence, the torque sensor is purposely made to be one of many weaker components of the driveline.