Showing papers on "Magneto published in 1996"

Contact free speed or position detector for ferromagnetic generator part

Abstract: The arrangement detects the rotation rate or speed or the position of a generator part (1) provided with teeth (2) and gaps. The generator part is rotatable about an axis (8) or is linearly movable. It is made of ferromagnetic material. The device has at least one fixed sensor (3). This has at least one giant magneto-resistive element with at least one magnetic bias layer and at least one weakly magnetic measuring layer. The layers of the magneto- resistive element lie in layer planes parallel to the direction of movement (5) of the generator part relative to the sensor. Permanent magnets (4) are arranged on the side of the sensor furthest from the generator part. The field lines of the permanent magnet run through the sensor to the teeth and gaps of the generator part.

Marine power device

Abstract: A marine power device capable of preventing a failure in actuation of constantly-driven loads required to be constantly actuated for continuing operation of an internal combustion engine, when various loads are actuated using both a magneto driven by the engine and a battery driven by the magneto as a power supply in a ship in which an outboard motor is used as a propelling equipment. The device includes a switch which functions to separate occasionally-driven loads increased in power consumption and the battery from the magneto when the battery is reduced in output voltage thereof to a level of failing to actuate the constantly-driven loads due to connection of the occasionally-driven loads to the battery or overdischarge of the battery. The switch is arranged at a position which does not affect flowing of a drive current fed from the magneto to the constantly-driven loads.

Non-contact rotation sensor with premagnetising magnets for measuring rotation

Abstract: The magneto resistive element group is arranged within the premagnetising field in a plane of the tooth crest and is arranged lying opposite the teeth. The group consists of a multiple of magneto resistive elements (12a-12f, fig.4), which run parallel to each other, and along a direction of rotation of the gear, as well as being electrically connected in series with each other. A current supply unit supplies current, which flows through a multiple of the magneto resistive elements connected electrically in series with each other, so that the magnetic vector altering corresp. to the rotational movement; is determined on the basis of the combined value of all the alterations of the corresp. resistance values of the magneto resistive elements.

A magneto electric generator rotor

Abstract: A magneto electric generator comprising a pair of first magnetic poles (83a) and a second magnetic pole (84) comprising a magnetic plate (84a) attached between said first magnetic poles (83a) through a non-magnetic part (83d,96). The magnetic plate (84a) holds a magnet (85) between itself and the rotor core (81). The non-magnetic part may be a non-magnetic screw (96).

Voltage regulator for magneto-electric generator for motorcycle, especially for controlling vehicle headlamps

Abstract: The magneto voltage regulator has a capacitor (C1) to store a charge when a positive output is delivered by the magneto to charge the batteries. A second capacitor (C3) stores a charge due to the charge potential on the first capacitor and an output potential from a negative output. A thyristor switch (SCR1) short circuits the output of the magneto when the stored potential of the second capacitor is equal to a preset level. A voltage source is incorporated to produce an offset voltage for the second capacitor. A second thyristor (SCR20) connects the output of the regulator circuit to the battery.

High-field magneto-optics of MnF2 and YbCrO3

Abstract: We have investigated the propagation of the exciton magnon system in MnF2 and YbCrO3 under high magnetic fields. The formation and propagation mechanisms of the exciton—magnon bound state in these compounds strongly depend on the spin structure.

Optical readout systems for high density magneto-optic recording.

Abstract: A comprehensive model for the readout process in magneto-optic replay is presented. Applications to areas of current interest, including Partial Response signaling and Pulse Width Modulation recording techniques, are discussed.

Magneto transport study of a Bi2223 superconductor produced by a high-pressure method (vol 9, pg 644, 1996)

Abstract: Various physical properties of a high-pressure made ceramic have been studied in the normal state and mixed state region, mainly from the point of view of transport properties. The electrical resistivity, the thermoelectric power and the Nernst effect are reported for a broad temperature range and for fields between 0 and 4 T. Derived physical parameters like the excess (integrated) properties, the behaviour of the percolation line(s) as a function of temperature and field, the so-called transport energy, and the so-called activation energies, the Ginzburg - Landau parameter and the thermal Hall angle field and temperature dependence are given and briefly compared with previous reports. We point out that in the region examined, the so-called percolation lines differ whether the transport coefficient is purely electrical or is electrothermal in nature. We point out that the thermal Hall angle temperature is the same as the thermoelectric percolation temperature. Finally we examine for the first time in such systems the behaviour of the so-called `electrothermal conductivity'. Through a kinetic formalism using either an s-wave or a d-wave-like order parameter, we point out that the field dependence is quite different in the mixed state near the critical temperature. This allowed us to decide that the signature for a d-wave nature of the gap parameter exists for such transport properties near the critical temperature. .

Two-step type optical isolator

Abstract: PURPOSE:To obtain an isolator which is small in size and low in insertion loss by connecting two isolators in such a manner that the directions of the magnetic fields generated by the permanent magnets of both optical isolators are reverse from each other CONSTITUTION:This two-step type transparent isolator is produced by cascade- connecting the two transparent isolators 11a and 11b (connecting the isolators by aligning their optical axes) The respective optical isolators 11a, 11b, respectively, have the magneto-optical elements 12a, 12b having a Faraday effect, the cylindrical permanent magnets 13a, 13b which internally house the magneto- optical elements 12a, 12b and impress the magnetic fields to the magneto-optical elements 12a, 12b and polarizers 14a, 14b and analyzers 15a, 15b which are arranged before and behind the magneto-optical elements 12a, 12b The two optical isolators 11a and 11b are so connected that the directions of the magnetic fields generated by both permanent magnets 13a, 13b are reversed from each other Then, the magnetic lines of force receive the repulsion of the other permanent magnets and respectively pass the inside thereof

Solar Dynamo Driven by Global Convection and Differential Rotation and the Magneto-Thermal Pulsation of the Sun

Abstract: Since 1972 when we proposed a mechanism of the solar dynamo driven by mass flows of global convection and differential rotation in the solar convection zone, each process that constitutes the complex machinery of the solar dynamo has been clarified step by step (Yoshimura 1972, 1975a, b, 1978a, b, 1979, 1981, 1983a, 1985, 1993b). We now know that the basic process of the dynamo can be visualized by topological deformation of stretching, winding, and folding of magnetic field lines in the solar convection zone by combined flows of the differential rotation and the global convection under influence of the rotation. In this paper, we briefly review the basic part of the dynamo process in terms of the topological deformation of the field lines and proceed to the second major step of advancement of understanding of the dynamo machinery achieved from analysis of observed evidences of nonlinear interaction of mass and heat flows and magnetic field in form of magnetic flux tubes of multiple spatial and temporal scales, which is a new category of solar phenomena called the magneto-thermal pulsation of the Sun.

Magneto output simulator and testing device of igniter

Abstract: PURPOSE: To provide a magneto output simulator and a testing device of an igniter all that are compact in size, lighter in weight and inexpensive in cost and, what is more, they require no large-sized movable part such as a motor or the like. CONSTITUTION: A rectangular wave signal Vosc is outputted from an oscillator 12, controlling a switching element SW1, and a rectangular wave voltage Vo is impressed on inductance L. With this voltage Vo, a current I flows into a switching circuit 4, and when this switching circuit 4 is interrupted, energy so far stored in a rising area of this current I charges an ignition capacitor C at a falling area of the current I via a diode D2, an ignition coil 7 and a diode D1. This operation is repeated four times, and when an ignition signal Vg is emitted to the fourth cycle of the Vo waveform from a dummy sensor signal generating circuit 13 via an ignition signal arithmetic circuit 19, a thyristor SCR is conducted. Owing to this conduction, an electric charge of the ignition capacitor C is discharged via the ignition coil 7, whereby a high voltage is emitted in secondary winding 7b of the ignition capacitor C. Thus, a jump spark onto a spark plug 8 is carried out.

Far-Infrared Emission and Magneto Transport of 2D Hot Holes

Abstract: Streaming of hot carriers in bulk materials such as p-Ge is well known A lot of interesting galvanomagnetic and FAR emission phenomena is connected with it [1] However streaming in quantum well structures has not been studied experimentally [2] We report new experimental results of a galvanomagnetic and FIR emission investigation in 2DHG in a strong electric field E parallel and magnetic field H perpendicular to the 2DHG layers

Double-dip negative magnetoresistance observation in magneto-acoustic measurements in InSb

Abstract: We observed an unusual magnetic field dependence of the ultrasound absorption in InSb which shows two minima. These results are consistent with transport measurements and show that the nature of this double-dip negative magnetoresistance is not connected with low dimensionality or hopping conductivity.

Magneto-elastic device for the identification and authentication of signatures

Abstract: Magneto-elastic device for the identification and authentication of signatures The magnetic device for the identification and authentication of signatures makes use of the magneto- elastic anisotropy induced by voltages in magnetostrictive ferromagnetic wires to detect the variation in mechanical tension in the magnetostrictive wire. It consists of a magnetostrictive wire, a secondary winding, an exciter coil and a processing circuit for the signal picked up in the secondary winding consisting of an assembly for analysis and processing of the signal. When a current is caused to flow in the exciter coil of the magnetostrictive wire, a voltage is induced in the secondary winding which depends on the voltage in the magnetostrictive wire.