SU792510A1 - Linear electric motor - Google Patents

Description

Ieobretento relates to electro-HHOCTpoeHHro and can be used in drives of reciprocating and straight-line movements of metal-working machines with a wwpOKHM range / speed control with relatively large movements of the working body. A linear linear motor is known for its DC motor, which contains an inductor and measles l. The disadvantage of the motor is an increase in the consumption of active materials either on the inductor winding or on the chkor winding with increasing motor speed. Also known is a linear electric motor containing a U-shaped ferromagnetic base on opposite sides of which pole cores with an excitation winding and a working winding are placed opposite each other, and a movable part containing ferromagnetic cores mounted on a nonmagnetic strip, which have a length in the direction of motion, equal to the pole division of T, and located from each other at a distance equal to f G2. However, this digester has a significant drawback, which is expressed in this case by the strong grodol field of the reaction box FD, creating a current between the povoyk parts of that side of the working winding, which is enclosed inside the magnetic core of the fixed part. The magnetic fluxes of these frontal parts F are closed completely along the path of the main flow FD and change when moving from zero to the maximum value with a frequency determined by the ratio of the stroke length to the double pole division. This causes a significant ripple of engine effort, especially significant in the zone of low speed) Stey.

The chain of the invention is to increase the uniformity of motion of a linear motor,

This goal is achieved by the fact that the ferromagnetic cores of the movable part are made with beveled and opposite faces of the cores 9 adjacent to the pole cores of the frame, shifted relative to each other by pole division 1, and the extreme pole cores of the base frame are equipped with ferromagnetic attachments of length

Fig. 1 shows the design scheme of the proposed pick engine, the longitudinal paapeaj in Fig. 2 is a schematic diagram of the proposed linear motor, cross section; in fig. 3 - an element of the movable part with a cross-section in the form of a naralpelogram; in fig. 4 and 5, designs of an element of a moving part of an engine with a reduced dispersion flow.

The magnetic core of the fixed part of this motor 1 is made in the form of a U-shaped core, on which the ferromagnetic cores of the poles 2s are fixed, a non-winding excitation winding 3 and the main windings 4. set apart at intervals also equal -,

A necessary condition for the reaction flow core is the opposite direction of the core currents in opposite sections of the fixed magnetic cores of a length t. This is achieved by the fact that prismatic ferromagnetic cores 5 of the movable part -1 have cross sections in the form of parallelograms whose sides facing the surface are the active part of the stator, sh. -tejut, equal to pole division, C. the creation of an electromagnetic wuxi: iii: ferromagnetic cores 5, on: chor .. their.;: .- Lis in the outer zones of the interpolar th arsstranstva and obtaining a constant value of the magnetic induction in the working air gap of the linear motor, the stator end cells supplemented ferromagnetic attachments 6, each of length equal to P.

Ferromagnetic prismatic cores 5 are combined by a structurally non-continuous strip 7 with a metal-working machine 8 table.

If a cross section of the prism is made, for example, according to FIG.

4, i.e. add four faces with a height of 105, which are perpendicular to the planes of the pole tips, then the calculations will show a significant reduction in the dispersion flow (5 - one-sided gap between the magnetic cores of the fixed and moving parts).

A similar effect is achieved with the cross-sectional shape of the prism shown in FIG. 5. Obviously, if the condition of embedding the motor in the back of a ketal-working machine allows an increase in the distance between the poles of more than 0, 6, then the angle of inclination of the side face of the prism increases and the scattering flux decreases.

The proposed engine works as follows.

When received in FIG. 1, the currents of the crust winding 4 and the main magnetic flux, the ferromagnetic force arising in accordance with the law of Bio-Savart-Laplace, is directed to the right for the elements of the fixed part and to the left for the f-rhomagnet 1x prisms.

Under the action of this force, the moving part of the linear motor begins to move to the left. The electromechanical or semiconductor switch switches the current in the winding sections of the 4 core in such a way that in the stator conductors of the ferromagnetic cores 5 of the moving part that are in current against the active sides, the current of the same direction flows (when moving in one direction).

It should be noted that the design of the proposed linear motor is preferable when used with a semiconductor switch, since the moving part without windings does not require connecting conductors, i.e. there is no flexible cable moving together with the movable part, the presence of which is inevitable in the case of the movable part, the core winding is not holding.

Claims (2)

1. Patent of Great Britain No. 1207232., cl. H 02 K 41/02, H 2A, 1970. 2.viev. Sohweiz.eEEk-thOtechn.ver,. 1972, 63, No. 23, p. 1338-1344. J 2. 3 Ut ... I ../  ) Su) (l) (l) b). Zf} (QQ® :