RU1616488C - Method of controling magnetostrictive step actuator - Google Patents

Abstract

The invention relates to precision uiaroBUM actuators and can be used in high precision machine tools, in laser and optical devices. The purpose of the study is to increase the accuracy of working out given displacements. The postapproachment goal is achieved by that. that at each cycle of practicing the movement step, it is in direct order; A. and remove the longitudinal residual de | Connections from an electrically deformable element / element and completely recovering / 1 will restore its initial state by feeding and removing the transverse field at the moments of switching the clamp far from the load. 3 ill.

Description

The invention relates to precision stepping actuators and can be used in high precision machine tools, in laser and optical devices.

The purpose of the invention is to increase the accuracy of testing desired movements.

In FIG. 1 shows a magnetostrictive stepping device, section: in FIG. 2 - transients in two Igi clamps

 ), IgJ - f (t). the longitudinal Inp f (t) and POPcrete 1pop f (t) pulse windings of the same polarity, as well as transients of the relative displacement of the magnetostrictive element in the longitudinal Л1пр / 1-1 (x) and transverse LOpop / О f (t) directions x, controlled by a pulsed digital system of FIG. 3 - movement of the operating point

a magnetostrictive driving element along a magnetomechanical curve in the longitudinal and transverse directions.

Magnetostrictive linear step actuator consists of clamps 1 and 2. magnetostrictive tube 3 with load 4. magnetic core 5 located inside the tube with winding 6 creating a longitudinal field, winding 7 creating a transverse field and laid in the hole of the magnetostrictive tube 8 and the hole 9 of the magnetic circuit 5. guide 10. In FIG. 3 ABCDBFA - even magnetomechanical loops of longitudinal deformation and A B C D B F A - even magnetomechanical | 4 heck of loops of transverse deformation obtained by applying to magnetostrictive

with is about

element of a longitudinal magnetic field Nprod without a transverse floor Npop. The segments OB and OB correspond to residual deformations in the longitudinal and transverse directions after removing the longitudinal magnetic field Nprod without the participation of the transverse magnetic field. The curves OA and OA characterize the process of shifting the working point of the magnetostrictive tube in the longitudinal and transverse directions, respectively. The AEPO and A K P O curves characterize the process of shifting the operating point to its initial (point 0) position when removing residual deformations of the magnetostrictive element by a transverse field pulse Нр (relaxation coercive magnetic field) applied at points A and A. Operating points in the longitudinal and transverse directions due to an increase in the transverse field Нр Н pop and a decrease in the longitudinal field Нпрод, moving from points A and A, pass through the abscissa axis (Нпоп Нпрод) and form odd magnetomechanical loops in the longitudinal direction ОАЕРО and in the transverse direction. Experimentally, it is possible to select such a magnitude of the control pulse in the winding 7 8 depending on the magnitude of the control action in the winding: e 6 magnetic field Nprod to completely remove residual deformations both in the longitudinal and transverse directions, and the magnitude of the magnetic the field Hp will be the same for both directions of removing residual deformations of the magnetostrictive element due to the uniformity of the crystal structure of the material.

Let it be necessary to move the load in the forward direction, i.e. in FIG. 1. In the initial state, the windings of the device are de-energized, the clamps clamp the magnetostrictive element, At time to, they feed a control pulse into the winding 6 of such a magnitude that

0 0 5

0 5

5

0

5

move the load to the desired distance, and at the same time turn on the clip closest to the load 1. The load is moving. After achieving the necessary movement, the control action is removed from the clamp 7, and it fixes the magnetostrictive element at time ti. After the magnetostrictive element is fixed with a clamp, the control pulse (time ti, ti) is removed from the winding 6 and simultaneously fed, and then the control action of the clamp 2 and the toroidal winding 7 is removed. During the working cycle, the working point of the magnetostrictive tube will move in the longitudinal direction along the OAEPO curve, and the operating point in the transverse direction, along the OA n P O curve. Next, the cycle of working out the desired forward movement step is repeated (time interval ta-te). During t-t3, t4-t8, the longitudinal and transverse residual strains are completely removed.

Claims (1)

SUMMARY OF THE INVENTION A method for controlling a magnetostrictive stepping actuator, in which the first clamp that is farthest from the loads is fixed, provides a control action on the magnetostrictive deformable element by creating a longitudinal magnetic field in it, secures the second clamp, and at the same time fix the first the clamp and si. have a control action from the magnetostrictive deformable element, characterized in that, in order to increase the accuracy of working out the given displacements, simultaneously with the fastening of the clamp far from the load, a transverse magnetic field is created and the magnetostrictive deformable element is of a magnitude sufficient to remove residual deformations. fe y //////////////////// 7 /: | huh: aSVvV t 1 yff7i t i t T v v l n T -L -Vv jC, HAfAVffflfrj rt 7 irt fnf tV5 k-HtMI | lllt Uljlllllll tlHfHH4 H.TiJ I.N -, чЛ-VN V. - X - hChia --4 FIG. g fig.Z