49 results about "Inverse magnetostrictive effect" patented technology

A hub unit with a sensor comprises a hub unit 1 including a body-side raceway member 3, a wheel-side raceway member 4 and two rows of rolling elements 5, and a sensor device 2. The sensor device 2 includes a magnetostrictive sensor 8 for detecting the inverse magnetostrictive effect, and the magnetostrictive sensor 8 is mounted to the body-side raceway member 3 so as to be capable of measuring the tensile strain in the uppermost part of an inner wheel 17 of the wheel-side raceway member 4. From the output of the magnetostrictive sensor 8, the tire grounding load and the rotational velocity are detected.

The present invention discloses a device and system for magnetographic analysis of mechanical flaws and defects along structures located underwater for example, metallic pipelines, utilizing an autonomous magnetic tomography method (MTM) apparatus based on the inverse magnetostrictive effect for magnetographic identification, in the form of an array of flexible autonomous undersea vehicle (AUV) torpedo constructions of interconnected elements or pods. The array of AUV torpedo constructions are flexibly linked together so that the device can readily navigate within the contours of pipeline to be inspected using the flow media as propulsion means or alternatively by means of independent motive means without interfering with the system flow. The torpedo construction elements or pods each contain three MTM sensors situated 120 degrees apart on a non-perpendicular cross section arrangement, and perform a variety of independent functions. e.g., data storage data, sensor data memory unit, odometer distance measurements, GPS location, geomagnetic navigation capability.

The invention relates to a tester for the magnetic property of a magnetostriction material. The tester comprises a main measurement component, a standard force sensor, a stress applying device and a permanent magnet. The main measurement component is composed of an upper loop module, a lower loop module, an upper pole head, a lower pole head, a left exciting coil, a right exciting coil and the magnetostriction material to be tested. The overall structure of the main measurement component is in bilateral symmetry. Through the application of the main measurement component and the stress applying device, the device can test the property of the positive magnetostriction effect and the property of the converse magnetostriction effect, can carry out a magnetic property test under the condition of dynamic excitation, and is simple in structure and high in flexibility.

The invention discloses a two-phase opposed super magnetostrictive self-sensing driver, relates to a super magnetostrictive material self-sensing technology and a micro drive technology and belongs to the technical fields of micro drive and electrical control. According to the two-phase opposed super magnetostrictive self-sensing driver disclosed by the invention, the driving and self-sensing function of the driver is achieved by using magnetostriction and converse magnetostriction effects of a super magnetostrictive rod; two self-sensing driving assemblies are symmetrically arranged on two sides of a connecting piece (17) by disc springs (16) for mutually coupling to output a certain displacement and driving force; the pre-compression of the super magnetostrictive rod is accurately controlled and finely adjusted, so that the super magnetostrictive rod works in a linear interval; stable differential voltage is applied to two driving coils by a dual-output digital control power supply with a self-sensing detection and feedback function and a self-sensing signal is monitored in real time by using a real-time dynamic balance signal based on a DSP (Digital Signal Processor) high-speedsinglechip microcomputer, so that the real-time control and accurate positioning for the displacement of the connecting piece (17) are realized; and the two-phase opposed super magnetostrictive self-sensing driver is especially suitable for the field of hydraulic servo control.