A torque sensor, torque transducer or torque meter is actually a device for measuring and recording the torque on a rotating system, like an engine, crankshaft, gearbox, transmission, rotor, a bicycle crank or torque sensor. Static torque is fairly very easy to measure. Dynamic torque, on the contrary, can be difficult to measure, because it generally requires transfer of some effect (electric, hydraulic or magnetic) from the shaft being measured to a static system.
One way to accomplish this would be to condition the shaft or even a member attached to the shaft with a series of permanent magnetic domains. The magnetic characteristics of such domains will vary according to the applied torque, and so 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 put on a rotating shaft or axle. With this particular method, a method to power the strain gauge bridge is essential, as well as a methods to receive the signal from the rotating shaft. This could be 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 some high-level analog output signal, including /-10VDC.
A more recent development is using SAW devices attached to the shaft and remotely interrogated. The strain on these tiny devices as the shaft flexes may be read remotely and output without the need for attached electronics on the shaft. The probable first use within volume are usually 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 by way of twist angle measurement or phase shift measurement, whereby the angle of twist caused by applied torque is measured by using two angular position sensors and measuring the phase angle between the two. This procedure is used inside the Allison T56 turboprop engine.
Finally, (as described within the abstract for all of us Patent 5257535), in the event the mechanical system involves the right angle gearbox, then this axial reaction force experienced by the inputting shaft/pinion can be associated with the torque gone through 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 of the input pinion bearing housing. The output torque is definitely measured using a static torque meter.
The torque sensor can function like a mechanical fuse and it is a vital component to obtain accurate measurements. However, improper setting up the torque sensor can harm the device permanently, costing time and money. Hence, the torque sensor must be properly installed to make certain better performance and longevity.
The performance and longevity in the load cell as well as its reading accuracy is going to be affected by the appearance of the driveline. The shaft becomes unstable in the critical speed of the driveline and results in torsional vibration, which can harm the torque sensor. It really is necessary to direct the strain with an exact point for accurate torque measurement. This time is typically the weakest point of the sensor structure. Hence, the torque sensor is purposely created to be one of the weaker aspects of the driveline.