A torque sensor, torque transducer or torque meter is 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 sensor. Static torque is comparatively easy to measure. Dynamic torque, on the other hand, can be difficult to measure, as it generally requires transfer of some effect (electric, hydraulic or magnetic) from the shaft being measured to a static system.
A good way to accomplish this would be to condition the shaft or a member attached to the shaft with a number of permanent magnetic domains. The magnetic characteristics of such domains can vary based on the applied torque, and so may 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 applied to a rotating shaft or axle. With this method, a way to power the strain gauge bridge is essential, as well as a methods to receive the signal through the rotating shaft. This is often accomplished using slip rings, wireless telemetry, or rotary transformers. Newer kinds of torque transducers add conditioning electronics and an A/D converter to the rotating shaft. Stator electronics then look at the digital signals and convert those signals to some high-level analog output signal, including /-10VDC.
A far more recent development is the use of SAW devices attached to the shaft and remotely interrogated. The force on these tiny devices because the shaft flexes may be read remotely and output without the need for attached electronics on the shaft. The probable first utilization in volume will be in the automotive field as, of May 2009, Schott announced it possesses 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 as a result of applied torque is measured by making use of two angular position sensors and measuring the phase angle between them. This technique is used in the Allison T56 turboprop engine.
Finally, (as described within the abstract for all of us Patent 5257535), if the mechanical system involves the right angle gearbox, then your axial reaction force experienced by the inputting shaft/pinion could be linked to the torque felt by the output shaft(s). The axial input stress must first be calibrated from the output torque. The input stress could 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 is also an important component to obtain accurate measurements. However, improper installation of the torque sensor can damage the device permanently, costing money and time. Hence, the torque sensor needs to be properly installed to make certain better performance and longevity.
The performance and longevity of the compression load cell and its reading accuracy will be affected by the design of the driveline. The shaft becomes unstable in the critical speed of the driveline and causes torsional vibration, which can harm the torque sensor. It is actually essential to direct the strain for an exact point for accurate torque measurement. This time is normally the weakest point of the sensor structure. Hence, the torque sensor is purposely made to be one of the weaker aspects of the driveline.