摘要:
An apparatus, for example for a pitch change mechanism, includes a cylinder having a magnetic portion defining an annular array of features extending parallel to the longitudinal axis of the cylinder, the cylinder rotating in use and able to translate longitudinally. There is a sensing arrangement including a stationary magnetised core and two coils connected in series and wound around the core. In use, the cylinder rotates and current is induced in the coils. Monitoring equipment is arranged to calculate rotational speed of the cylinder from the frequency of the current and to calculate longitudinal position from the relative amplitude of the current in each coil. Also a method.
摘要:
A plurality of layers of flat coils (L41 - L46) are stacked and connected in series with each other to form a single coil pole (L4), and the coil pole is energized by an A.C. signal. Magnetism responsive member, provided to be opposed to the coil pole in a non-contact manner, is displaced relative to the coil pole, so that correspondency, to the coil section, of the magnetism-responsive member varies in response to variation in the relative position and thus impedance variation occurs in the coil pole. Position detection signal is provided on the basis of an output signal, responsive to the impedance variation, taken out from the coil pole.
摘要:
The invention relates to a device (10) for contactless measurement of a displacement path, especially for the detection of position and movement, comprising a sensor electronics system for the provision of an alternating current and the evaluation of alterations therein, in addition to an inductive sensor (13) comprising at least one flat coil (15), whereby each coil (15) is configured with a helicoidal conductor (22) disposed on a plane and one of the two flat surfaces (19) thereof forms a measuring surface (14) which variously covers a measuring object (11), arranged at a distance, according to the movement thereof parallel to the measuring surface (14).
摘要:
An improved position encoder system (100) for providing an output signal representative of the position of a movable body, relative to a reference position, includes at least one magnetic element (106) fixedly attached to the movable body. The system further includes a first spatially orthogonal fluxgate sensor pair (102) and a second spatially orthogonal fluxgate sensor pair (104) for detecting the magnetic field. The first sensor pair is disposed adjacent to the polar axis (PA) at a first predetermined distance, and the second pair is disposed adjacent to the polar axis at a second predetermined distance, preferably twice the first predetermined distance. The system further includes a signal processor (108) for receiving from the first sensor pair and a signal from the second sensor pair. The signal processor produces an output signal that corresponds to a predetermined combination of the signal from the first sensor pair and the signal from the second pair, such that a resulting relationship between the output signal and the position of the movable body is substantially linear.
摘要:
In a position transducer having detection coils 11 and 21, auxiliary coils 12 and 22 driven in phase with the detection coils 11 and 21 are lap-wound on the ends of the latter, respectively, to substantially increase the winding density at the ends of the detection coils 11 and 21, thereby reducing the magnetic field non-linearity at the coil ends.
摘要:
Die Erfindung betrifft einen Wegsensor, mit einem hohlzylindrischen Spulensysytem (4;10,11,12) in das im Bereich der Zylinderachse ein magnetisch leitender Stab (14) als Weggeber axial eintauchbar ist. Der magnetisch leitende Stab (14) ist an einem Schieber oder Steuerkolben (5;6) einer hydraulischen Stellvorrichtung (2) befestigt, der eine, einen äußeren Hohlzylinder (7) bildende Ausnehmung aufweist, welche das hohlzylindrische Spulensystem (4;10,11,12) in einem vorgegebenen Abstand parallel zur Lage des magnetisch leitenden Stabes (14) umschließt.
摘要:
Subject-matter of this invention is a device for measuring angular microvariations, having a double pendulum construction comprising two vertical cylindrical legs (11, 12) connected to one another by a first transversal arm (13), having merely mechanical and structural function, and by a second transversal cylindrical arm (14), also acting as a housing for a LVDT transducer, wherein the upper ends of said two vertical legs (11, 12) are closed by means of rubber stoppers. A wire (15) is connected to said rubber stoppers by means of screws (20) and a respective block (16) is suspended therefrom. Said blocks (16) are partially immerged in a liquid material contained in two cups formed by end enlargements of said second transversal arm (14) and they are firmly interconnected by means of a rod (17) bearing the core (18) of the LVDT transducer. The device is equipped with a microprocessor based electronic system for detecting, processing and transmitting the measurement data.