SU890487A1 - Magnetostriction device of angular displacements - Google Patents

Description

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The invention relates to electrical engineering and can be used as an actuating element in nodes of high-precision systems for automatic alignment of optical quantum generators, in optical-mechanical devices, in automatic guidance systems, for correcting kinematic chains in high-precision machine tools, etc.

A magnetostrictive drive is known, comprising a magnetostrictor, an excitation coil, a floating worm, for testing large angles I.

However, with its help it is impossible to work out small exact angular displacements.

It is also known to use a magnetostrictive angular displacement device, comprising a base mounted on the base of a magnetostrictive propeller with an excitation winding and a lever transmission in the form of a bar rigidly connected to the propeller. In the known device, the propeller is made in the form of a cantilever-mounted multi-plate linear magnetostrictor, and the linkage is in the form of a bar, one end of which is rigidly connected to the mover, and the other is removed when the bar is rotated around a fixed axis 2.

The disadvantage of this device is that the accuracy of working out a given angular displacement by it is limited due to the presence of backlash and friction at the junction of the fixed axis and the linkage bar. This is especially true in the dynamic mode of the device. In addition, as the angular displacement increases, the action of the magnetostriction force

The movement generated by the propeller deviates from the directional lever perpendicular to the bar, which leads to the bending deformations of the propeller and the bar and, consequently, to an error, when refining the specified angular displacement. Moreover, the presence of a temperature error resulting from the thermal expansion of the magnetostrictive propulsion and lever transmission strips reduces the accuracy of the operation of this device.

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Claims (2)

The aim of the invention is to improve the accuracy of the processing of angular movements by a magnetostrictive device. The goal is achieved by the fact that in a magnetostrictive angular displacement device containing a base, a magnetostrictive propulsion device with an excitation winding mounted on the base and a lever transmission in the form of a bar rigidly connected with the propulsion unit, the propulsion unit is in the form of a ring divided into four equal parts the two adjacent parts are made of materials with magnetostriction coefficients of different sign, and the joints of the parts lying along one of the diameters of the ring are connected by the said lever bar This is an important gear equipped with an output axis, and the base is also made in the form of a strap connecting the other two joints of the ring parts along the diameter. In addition, all parts of the ring and both strips are made of materials with the same thermal expansion coefficient. The drawing schematically, in two projections, shows the device of angular displacements. The magnetostrictive device of angular displacements contains a magnetostrictive mover in the form of a ring consisting of four equal parts, two of which 1 and 2 are made of a material with positive magnetostriction coefficients, and parts 3 and 4 are made of a material with a negative magnetostriction coefficient, the winding 5, uniformly wound around the perimeter of the propeller, the bar of the lever gear 6, which is made integral with the output axis 7 and connects the two opposite joints of the propeller, as well as connecting the two other sections Single propulsor bar 8 in, the middle of which produced a rigid / fastening propulsor, and hence the whole device. In the second projection, the field winding is not shown. When the excitation winding 5 is connected to a direct current source, a circumferential magnetic field arises in the propulsion unit and, due to the linear magnetostriction effect, all parts of the composite ring change their length in the field direction. Thereby, parts 1 and 2, made of a material with a positive magnetostriction coefficient, are lengthened, and parts 3 and 4, made of a material with a negative magnetostriction coefficient, are shortened. This leads to TOiyiy, that the joints of parts 1, 3 and 2, 4 of the propulsor move around the circle at a certain angle, and the bar b, together with the output axis 7, rotates at the same angle. When applied to a direct current of alternating current, the output axis makes an angular oscillatory motion with a frequency equal to the frequency of alternating current. If the winding 5 is connected only to an alternating current source, then the output axis 7, due to the parity of the magnetostrictive effect, makes angular oscillations at twice the frequency. The use of the proposed device in high-precision micro-displacement systems makes it possible to increase the accuracy of the processing of angular displacements by eliminating the movable joint in the lever transmission and eliminating bending deformations. The low temperature tolerance of the device makes it possible not to impose special requirements on the temperature regime of its operation. Claim 1. Magnetostrictive angular displacement device comprising a base mounted on the base of a magnetostrictive propeller with an excitation winding and a lever transmission in the form of a bar rigidly connected with the propeller, characterized in that in order to improve the accuracy of the development of angular displacements, the propeller is designed as rings, divided into four equal parts, and any two adjacent parts are made of materials with magnetostriction coefficients of different sign, and the joints of the parts lying one of the diameters of the rings are connected to said bar linkage provided with an output axis, and the base is also designed as a strap connecting the other two diameter interface ring parts. 2. A device according to claim 1, characterized in that all parts of the ring and both strips are made of materials with the same coefficients of thermal expansion. Sources of information taken into account during the examination 1. USSR author's certificate No. 125722, cl. On 23 September 23/02, 1959. 2.Churikov A.P. Calculation of the magnetostrictive drive turning the machine node. “Machine tools and tools, 1969, No. 11, p. 17-18 (prototype).