Universal Magnetoresistive Current Sensor Ppt

Posted By admin On 16.09.21

Chemical Technology, Control and Management

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When the current and magnetic moment are parallel, the resistance of the strip is greatest; when they are at a 90 degree angle to each bother, it is smallest. Magnetoresistive field sensors are usually configures as a half or full bridge. Free PPT Templates; Automobile. Security in Wireless Sensor Networks. Universal Magnetoresistive Current Sensor Ppt Alliance Future Combat Game Kadhalar Dhesam Tamil Film Free Download Mp3 Hd Songs Crack Nfs Most Wanted 2012 Fisierul. Sensor, improved insensitivity to run-out, tilt, and twist, reverse polarity protection dual analog voltages respond to changes in magnetic field angle; sine and cosine output; ac-curate to 0,102 mm 0.004 in Magnetic Sensors Magnetoresistive Sensor ICs With a built-in magnetoresistive bridge integrated on silicon and encapsulated in a plastic. Universal current sensor ABSTRACT The measurement of electric current strength is not always easy especially when the measured signal requires further electronic conditioning. Simply connecting an ammeter to an electrical circuit and reading out the value is no longer enough.

Abstract

In communication and communication devices, power equipment, relay protection and automation terminals, in the electric power industry of 'smart' cities and homes, in industry, in railway transport, microprocessor-based relay protection and automation devices, distributed generation installations, including renewable energy sources, and electricity storage, as well as 'intelligent' automated information and measurement systems are beginning to be used. Contactless converters of direct and alternating currents of control and control systems are widely used in them. Their disadvantages are a narrow range of controlled currents, large dimensions and weight. Therefore, it is important to eliminate them. The paper discusses the general principles of construction of contactless converters of large direct currents, the main requirements for them, and shows the results of the development of one of the options proposed by us, universal contactless magneto-modulation converters of large direct currents with an extended range for various control and control systems. They differ from the known ones by an extended controlled range with small dimensions and weight, and increased accuracy and sensitivity. The converter has a simple and technological design with low material consumption and cost, and can control large direct currents, as well as alternating currents, without contact. The paper considers the errors from external magnetic fields of universal contactless converters of control and control systems. It is shown that the error from the external magnetic field does not exceed 0.08% if the number of sections of the measuring winding is even and with their symmetrical arrangement, and with their even increase-the error decreases. At the same time, the developed contactless converters can be widely used in industry, metallurgy, railway transport, agriculture, water and farming, as well as in the electric power industry of “smart” cities and homes and for checking electric meters at the place of their installation.

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DOI

https://doi.org/10.51346/tstu-02.21.1-77-0007

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Recommended Citation

Plakhtiev, A.M; Gaziev, Gayratjon; Meliboyev, Yahyojon; and Doniyorov, Odil (2021) 'ERRORS OF UNIVERSAL CONTACTLESS CONVERTERS OF MONITORING AND CONTROL SYSTEMS FROM EXTERNAL MAGNETIC FIELDS,' Chemical Technology, Control and Management: Vol. 2021 : Iss. 2 , Article 7.
DOI: https://doi.org/10.51346/tstu-02.21.1-77-0007
Available at: https://uzjournals.edu.uz/ijctcm/vol2021/iss2/7

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When a ferromagnetic material — such as iron, nickel, or cobalt — is subjected to an external magnetic field, the magnetic domains within the material align, creating internal stresses that cause the material’s shape or dimensions to change. This phenomenon is referred to as magnetostriction. Conversely, when a magenetostrictive material is subjected to a stress, its magnetic properties will change. This is known as the Villari effect.

Another manifestation of magnetostriction is the Wiedemann effect: When a wire is subjected to a magnetic field oriented parallel to its length, and a current is passed through the wire, the wire experiences torsional strain at the location where the magnetic field occurs.

The Wiedemann and Villari effects form the basis of linear magnetostrictive sensors.

All ferromagnetic materials experience magnetostriction, but in some materials, the magnitude of the dimensional change is too small to be of practical use. For example, when a magnetostrictive bar or rod is placed in a magnetic field oriented parallel to the length of the bar, the bar will change length. However, the length change for materials used in linear magnetostrictive sensors is very small — typically on the order of 10^-6 m/m

Universal magnetoresistive current sensor ppt presentation

In magnetostrictive sensors, the wire, or bar, is referred to as a waveguide. It is typically made from an iron alloy and is mounted to a stationary part of the machine. The magnetic field is provided by a magnet, referred to as a position magnet, which is attached to the moving part being measured. Short pulses of current (1-3 μs) are applied to a conductor attached to the waveguide.

As the Wiedemann effect states, torsional strain (twist) is induced in the waveguide, due to the interaction of the magnetic field caused by the current and the magnetic field caused by the position magnet. Because the current is applied as a pulse (referred to as an interrogation pulse), the twist travels down the wire as an ultrasonic wave, moving at approximately 2850 m/s. This twist, or mechanical pulse, is detected by a signal converter (also referred to as a strain pulse converter), which relies on the Villari effect to create a voltage pulse indicating receipt of the mechanical strain wave.

The time between the initial current pulse and the detection of the mechanical pulse indicates the location of the position magnet, and therefore, the position of the moving part being measured. The interrogation rate, or update rate, can range from one time per second to over 4000 times per second, with the maximum update rate determined by the length of the waveguide.

Current Sensor Hall Effect

Magnetostrictive sensors provide absolute position information and, unlike incremental encoders, do not need to be re-homed when there is a loss of power. They can also use multiple position magnets with one waveguide, making them well-suited for applications that require position information for multiple components along the same axis, such as the knives on a slitting machine.

In addition to being non-contact, magnetostrictive designs enclose the waveguide in an extruded aluminum housing or stainless steel tube, so they are virtually impervious to contamination. They can also operate when there is a barrier between the position magnet and the waveguide — as long as the barrier is non-magnetic, such as ceramic, plastic, aluminum, or stainless steel.