SU1001347A1 - Linear dc motor - Google Patents

Description

one

The invention relates to electrical engineering and can be used in drives of reciprocating and rectilinear movement of production mechanisms with a wide range of speed control for relatively large movements of the working member.

The known design of a linear DC motor comprises a fixed part made of two parallel ferromagnetic strips with variable magnetic permeability, the protrusions of one of which are located opposite the hollows of the other, and a movable core with core windings and excitation windings located on a common magnetic core 1.

A design that provides an increased efficiency value due to the use of special core circuits, a coil with valve elements, cannot be carried out with a magnetic conductor carrying excitation windings and a core whose length is five pole divisions, and one pole division is occupied by the excitation winding. Consequently, this structure has an insufficiently high specific pulling force.

Also known is a linear electric motor of direct current, consisting of a fixed part in the form of two parallel ferromagnetic strips with protrusions and a movable part in the form of two identical cores with excitation windings and t21 radial windings.

The known motor provides an increase in the specific traction force, however, a part of the conductors of the winding of the core, which is located in between the 2Qpaps, is flowed around the current, but does not take part in the creation of the tractive effort, due to which the efficiency is reduced.

Claims (2)

The purpose of the invention is to increase tractive effort and efficiency, reducing the weight of the copper core winding and the steel weight of the bodies. This goal is achieved by the fact that the cores of the movable part are installed one above the other in the direction perpendicular to the movement so that the axes of the core windings coincide, and the total length of each core of the cores of the core is laid in the slots and the strips of the fixed part are placed on each a strip in two rows in a checkerboard pattern, so that a hollow is located opposite the protrusion of one strip; Figure 1 shows the constructive scheme of the proposed engine, top view; figure 2 - section A-L in figure 1; - in fig.Z - section bb in figure 1; on figa - one of the magnetic cores of the fixed part of the proposed engine. The proposed linear DC electric motor consists of two ferromagnetic strips 1, on each of which in a staggered order on each pole division f there is a ferromagnetic protrusion 2 of the upper row forming the magnetic field and a protrusion 3 of the lower row. The axes of the protrusions, the upper and lower rows are shifted by the magnitude of the pole division T The length of each of the projections 2 and 3 is equal to t; and height is Zff - the size of the active conductor of the winding of the box of each of the magnetic cores of the moving part). The distance in height h.j between the rows of protrusions 2 and 3 and the thickness of each protrusion are determined by the basis of the permissible values of the scattering fluxes and are taken equal to 10-15 sl (where sl is the value of one-sided magnetic gap). The moving part of the proposed engine consists of two cores 4, located one above the other without shifting by distance h, each of which. carries the excitation winding 5. The length of each of the cores 4 along the ferromagnetic strips 1 is equal to 2t, which is more than the same value by the size of the gap along the stroke between the magnetic cores of the known. This makes it possible to obtain a correspondingly greater pulling force, ceteris paribus. The winding sections of the core 6, in contrast to the known, are common to both cores 4, which makes it possible to reduce the consumption of copper. Fig. 4 schematically shows the arrangement of the common section of the winding 10 7. The core 6 of both magnetic conduits of the movable part in the magnetic field of the excitation windings 5. The magnetic flux penetrates the upper part of the section (against the ledge 2) and diagonally prokhrdit in the lower part of the strip 1 and enters the lower core (against the ledge H). In the course of the movement of the moving part of the engine, the flux linkage of each of the winding section of the core from O to max. From FIG. It can be seen that the FCs penetrate the same section twice, in contrast to the known one, which allows one to obtain an emf of a section of the same size as the emf of a section known at half the value of the main magnetic flux. This circumstance makes it possible to reduce the consumption of steel engines. . The proposed engine works as follows. By means of an electromechanical or semiconductor switch controlled by a position sensor, the winding of the core 6 is flowed around the current. The excitation windings 5 are turned on in such a way that they create the main magnetic flux F0, which closes in a plane perpendicular to the direction of movement of the moving part. Because of the operation of the currents of the winding of the core and the main magnetic flux creates a thrust force of the motor F, under the action of which the movable part begins to move to the right. The electromechanical or semiconductor switch, when moving the core, makes such switchings of the currents in the core winding so that in the conductors located in the zone of ferromagnetic protrusions there are 2 upper rows, currents, when moving in one direction, are kept in one direction the protrusions 3 of the lower p is the opposite. The motor reverse is made by conventional methods used for DC motors. Claims of the invention Linear DC electric motor consisting of a fixed part in the form of two parallel ferromagnetic strips with protrusions and a movable part in the form of two identical cores with excitation windings and laid in the grooves of the main windings, characterized in that, in order to reduce the weight copper core and weight of the steel of the engine, increasing the thrust force and. KPD cores of the movable part are installed one above the other in the direction perpendicular to the movement so that the axes of the slots of the main windings coincide The windings are placed in the grooves common to each side of the cores, and the protrusions of the strips of the fixed part are placed on each strip in two rows in a checkerboard pattern, so that opposite to the protrusion of one strip is the hollow of the other. attention during examination 1. USSR author's certificate for application no. 2593198/08, KJi. H 02 K, 1978. 2. USSR author's certificate according to the application N ° 2613056/07, cl, H 02 K 1/02, 1978. but. B  k 7 1 M Y ((2 J FIG.