This section provides an overview for torque transducers as well as their applications and principles. Also, please take a look at the list of 5 torque transducer manufacturers and their company rankings.
Table of Contents
A torque transducer is a transducer that converts torque of a rotating or stationary device such as an engine into an electrical quantity for measurement. In a rotating machine, the amount of torsion of a rotating shaft is converted to an electrical quantity by a strain gage, etc., and is extracted to a stationary part by a slip ring or radio, and the transmitted torque and torque fluctuation are measured. Measurement is stable from a stationary state to the high-speed rotation range.
A torque transducer is used for research, testing, and inspection of rotating equipment. In selecting a transducer, it is necessary to consider rotating or non-rotating, rotational speed, environmental conditions, and mounting conditions.
In automotive development, torque is measured over a wide range of components, such as engines, transmissions, drive shafts, axles, motors, and auxiliary equipment. They are used to examine the strength of each axis in bench tests and driving tests, to analyze torsional vibration by frequency analysis of torque fluctuations, and to resolve noise and vibration caused by engine torque fluctuations.
Motor testers are used to test motor performance by installing torque transducers between the test motor and a load device. The load uses a powder brake or hysteresis brake to measure output torque relative to rotational speed.
It is also used to measure the rotational load on the roller. Torque transducers between the drive motor and the rollers are used to measure the torque when feeding paper or foil to determine the optimum conditions.
Torque transducers are available in a variety of conversion methods: strain gauge type for non-rotating types, and magnetostrictive, strain gauge type, phase difference type for rotating types. The strain gauge type is often used because of its superior accuracy and stability. Signals are extracted from rotating bodies using contact-type slip rings, non-contact FM transmitter transmissions, optical devices, and rotary transformer transmissions.
The strain gauge type uses four gauges assembled in a bridge to provide zero-point compensation and temperature compensation to improve accuracy. Strain gauges are attached to the surface of the shaft to be measured in two orthogonal directions at a 45-degree angle to the axis of rotation to measure the amount of strain, which is converted to torque.
The magnetostrictive type uses magnetostrictive material on the shaft and excites it with a coil on the fixed side to measure the change in magnetic permeability, thereby enabling non-contact measurement of torque.
The phase difference type transmits the phase difference between two magnetic gears without contact using electromagnetic pickups and has the disadvantage of being large.
Torque can also be measured by capacitance, spring, optical, and piezoelectric methods. In either method, the transmitted data is converted from the amount of strain to torque using the elastic modulus of the material used.
*Including some distributors, etc.
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