SU920903A1 - Small angular displacement stepping drive - Google Patents

Description

(5) STEP DRIVE OF SMALL ANGULAR DISPLACEMENTS

I

The invention relates to electrical engineering and can be used in instrument making, in automation systems and in precision machine building.

At present, precision devices, machine tools, measuring machines, etc., have been developed in many areas of technology, in which small and super small precise movements must be made. To obtain such movements by traditional mechanical or electromechanical methods is extremely difficult, ai submas is impossible. The I-magnetostriction principle eliminates any intermediate mechanical transfers and thus provides high sensitivity and greater mechanical rigidity of movement with significant working forces. Of great importance is the creation of stepper drives with high reliability and npocTofi design.

A drive of small angular displacements is known, comprising a base, a disk mounted with the possibility of rotational motion and a driving device interacting with it. To increase the pitch frequency, the drive unit is made of an electrically deformable piezoceramic material in the form of a ring divided by 120 into equal

To parts, piezoceramic elements, which are mounted on a fixed base and fixed on it from one side. The disk is mounted in such a way that it is in contact with the piezoelectric elements 1.

Claims (2)

The disadvantages of the known construction are the low reliability of the engine, due to the fragility of the piezoceramics, as well as its wear due to the fact that pieceoceramic elements in the process of work are subject to shock load. Also known is a stepper drive of small angular displacements, which contains a sliding base, a rotor, and an electromechanical transducer, fixed on the base and con sisting of electrically deformable elements, equipped with tips connected with the rotor. In the known drive, the rotor is made i in the form of a ring, and the electromechanical transducer is in the form of piezoceramic rods forming a triangle, the tops of which are connected by tips connected to the rotor by friction 2. The disadvantage of the drive is low reliability due to the frictional interaction of the tip with the rotor and the fragility of the piezo material of the rods. The purpose of the invention is to increase the reliability of the drive. This goal is achieved by the fact that in a stepper drive of small angular displacements containing a stationary base, a rotor and an electromechanical transducer fixed on the base and consisting of electrically deformable elements fitted with tips connected to the rotor, the rotor is made in the form of a disk of non-ferromagnetic non-deformable material, the electromechanical transducer is made in the form of magnetostriction rods, cantilever-mounted on the base, tangentially p otor, and the said tips are replenas at the free ends of the rods and are made in the form of electromagnets, and the rods located next to each other have magnetic sign coefficients of different sign. The drawing shows stepper when water, the overall appearance. The actuator contains a base 1, a disk 2 made of ferromagnetic material mounted with the possibility of rotational movement, and an electromechanical converter made of six magnetostrictive rods 3-8 with parallel excitation windings. Each of the rods is rigidly connected on one side with the base 1, and on the other with its Electromagnetic clamp, respectively 15-20. Electromagnetic clamps are provided with excitation windings 21-26, each three of which are connected in parallel through one. Magnetostriction rods 3.5 and 7 are made of a material with a positive magnetostriction coefficient, and the elements it, 6 and 8 have a negative magnetostriction coefficient. In the initial state, a current is supplied to the field windings 21, 23 and 25, the latter being attracted to the disk 2 and kept on it. When skipping current through excitation windings -1 of magnetostrictive Zt8 Rods, rods 6 and 8 are reduced, and rods 3.5 and 7 increase their linear dimensions by turning the disk clockwise at an angle. The clips 22, and 26 are then fixed, and the clips 21, 23 and 25 are released. When current is turned off in the excitation windings 9-1 of magnetostriction rods 3-8, rods 3.5 and 7 are reduced, and rods +, 6, and B. increase their linear dimensions by turning the disk clockwise at an angle. Repeating steps HAPPENS in the manner described. The reverse of the stepper drive is carried out by changing the order of the clamps. The technical advantages of the invention in comparison with the known one are to increase the reliability of operation due to the rigid connection of the clamps with the rotor. The wear of the clamping and rotor disc during operation has practically no effect on the change in the clamping force, which increases the durability of the device. Claims The drive of small angular displacements containing a fixed base, a rotor and an electromechanical transducer fixed on the base and consisting of electrically deformed elements provided with tips connected to a rotor, characterized in that, in order to increase reliability, the rotor is made in the form of a disk of ferromagnetic non-deformable About material, the electromechanical converter is made in the form of magnetostriction rods, cantilevered on the basis of the tangential rotor, and the said tips are mounted on the free ends of the str (studs and are made in the form of electromagnets, and the rods located nearby have different magnetostriction coefficients. 920903j Sources of information taken into account in the examination 1, USSR Author's Certificate No. 399036, cl. H 02 H 02 H 11/00 ,. 5 2. The USSR author's certificate Vf, cl. SIV IS / iO, 1977 (prototype).