Non-contact torque measurement device based on counter-magnetostrictive effect

Abstract

The invention discloses a non-contact torque measurement device based on a counter-magnetostrictive effect and belongs to sensor measurement technologies. According to technical key points, a measuredrotating shaft is coated with giant magnetostrictive material coating strips, the giant magnetostrictive material coating strips are divided into positive giant magnetostrictive material coating strips and negative giant magnetostrictive material coating strips; the positive giant magnetostrictive material coating strips and negative giant magnetostrictive material coating strips obliquely coat the measured rotating shaft in an axial direction at equal intervals in a bilateral symmetry manner; left and right ends of the measured rotating shaft are respectively nested into inner holes of a left bearing and a right bearing; the left bearing and the right bearing are respectively nested into the left and right ends of a shaft sleeve; an exciting coil is assembled onto the inner wall of the shaft sleeve; a left measuring coil and a right measuring coil of the same specification are assembled in parallel on the inner walls of the exciting coil in the axial direction. According to the measurement device disclosed by the invention, the torque is dynamically measured in real time at high accuracy and high precision without being in contact with a transmission shaft or changing a stress state of the transmission shaft and under rotary and dynamic operating conditions.

Description

Technical field: [0001] The invention belongs to sensing measurement technology, in particular to a non-contact torque measuring device based on reverse magnetostrictive effect. Background technique: [0002] Torque is the basic load form of various load transmission shafts, and is the most important parameter in the transmission system of rotating machinery. Torque measurement is an important means of product inspection, which can indirectly reflect mechanical power and efficiency, and is an important reference for analyzing and understanding the mechanical performance, safety and life of mechanical equipment. [0003] With the rapid development of industries such as automobile industry, shipbuilding heavy industry, aerospace, metallurgy and chemical industry, and machinery manufacturing, in order to increase the safety of the system and improve the operating efficiency of the system and equipment in the production process of various industries, the measurement of torque ha...

AI Technical Summary

Problems solved by technology

The advantage of this measuring device is that it widens the working speed range of the dynamic torsion sensor, prolongs its service life, and also has the function of rotating speed measurement; the problem with this measuring device is that there is mechanical contact between the conductive slip ring and the measured rotating shaft , easy to produce mechanical wear, with use, the accuracy of the sensor will decrease, and the service life will also be shortened. It needs frequent maintenance and replacement, which increases the cost, and there are many wires in the sensor, which affects the stability.

The advantages of this device are: sensitivity to magnetic field, simple structure, small size, wide frequency response, large output voltage change and long service life, etc.; The important factor is that the torsion angle is more obvious only when the length of the shaft reaches a certain level, so this method is more suitable for measurement occasions with a long shaft, and the torque under static conditions cannot be measured, it must be under rotating conditions, even at high speeds The measurement principle is only valid under the condition of rotation

The problem with this measurement system is that the cumulative error will continue to increase during continuous measurement, and multiple sensors are used for measurement at the same time, the structure is complex, and the errors caused by light intensity changes, axial and radial runout, and stripe reflectivity cannot be effectively suppressed.

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