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 impact (electric, hydraulic or magnetic) from the shaft being measured to a static system.
One method to achieve this would be to condition the shaft or even a member linked to the shaft with a number of permanent magnetic domains. The magnetic characteristics of those domains can vary in accordance with the applied torque, and therefore could be measured using non-contact sensors. Such magnetoelastic torque sensors are usually employed 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 method, a way to power the strain gauge bridge is necessary, and also a methods to receive the signal through the rotating shaft. This can be accomplished using slip rings, wireless telemetry, or rotary transformers. Newer types of torque transducers add conditioning electronics and an A/D converter for the rotating shaft. Stator electronics then browse the digital signals and convert those signals to a high-level analog output signal, such as /-10VDC.
A far more recent development is using SAW devices attached to the shaft and remotely interrogated. The strain on these tiny devices since the shaft flexes may be read remotely and output without making use of attached electronics on the shaft. The probable first utilization in volume will be in the automotive field as, of May 2009, Schott announced it features a SAW sensor package viable for in vehicle uses.
Another way to multi axis load cell is by means of twist angle measurement or phase shift measurement, whereby the angle of twist caused by applied torque is measured by making use of two angular position sensors and measuring the phase angle between the two. This procedure can be used in 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 this axial reaction force gone through by the inputting shaft/pinion can be related to the torque experienced 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 easily measured utilizing a static torque meter.
The torque sensor can function like a mechanical fuse and is also an important component to have accurate measurements. However, improper installation of the torque sensor can harm the device permanently, costing time and money. Hence, the torque sensor must be properly installed to ensure better performance and longevity.
The performance and longevity of the compression load cell and its reading accuracy will be affected by the appearance of the driveline. The shaft becomes unstable on the critical speed in the driveline to result in torsional vibration, which can harm the torque sensor. It really is required to direct the strain for an exact point for accurate torque measurement. This time is normally the weakest reason for the sensor structure. Hence, the torque sensor is purposely created to be one of many weaker aspects of the driveline.