SU792511A1 - Linear electric motor - Google Patents

Description

The invention relates to electrical engineering and can be used in B drives of forward-translational and straight-line movements of metalworking machines with a wide range of speed control with relatively large movements of the working body. A linear linear DC motor is known, comprising an inductor and a measles i. The disadvantage of the engine is an increase in the consumption of active materials either on the inductor winding or on the core winding with an increase in the engine stroke. Also known is a linear, electric motor containing a U-shaped ferromagnetic base, on the opposite sides of which pole cores with an excitation winding and a working winding are placed against each other, and a movable part containing ferromagnetic cores mounted on a & magnetic strip in the direction of motion, they have a length equal to the pole division 1 1, and spaced from each other at a distance equal to 2, the disadvantage of the linear motor. is that in this case the scln longitudinal field of the recovered core, created by the currents of the frontal parts of that side of the main winding, which is located in the lower part of the magnetic component of the fixed part, acts. The magnetic fluxes of these frontal parts close completely off the main flow path F o and change when moving from zero to maximum value with a frequency determined by the ratio of the stroke length to the double zero-point division. This causes significant pulsations of the total flow of the machine and, consequently, the corresponding pulsations of the engine thrust, especially significant in the zone of low speeds. The aim of the invention is to increase the uniformity of motion of a linear motor.

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These iKinbs have the effect that the active surfaces of the pole serlenae from the ferrous magnetic frame are shifted to each other in the longitudinal direction by the magnitude of the pole division, while the extreme pole core on each side of the GT-shaped bed, located on the side opposite to the shear direction, is provided with ferromagnetic prefix length equal to pole division t

FIG. 1 shows a linear circuit design with a compensated response of the front-end corners; in fig. 2 is a schematic diagram of a linear engine with a compensated response of the frontal cor shell (a shift of T) j in FIG. 3 is a structural diagram of an engine with a compensated reaction of the core of the frontal parts, cross section; on flash 4 shows a structural scheme of the engine with compensation for the reaction of the core of the frontal parts and eliminates the longitudinal ripple of the magnetic flux; in fig. 5 is a schematic diagram of an engine with a compaction of the reaction of the core of the lobbing parts and elimination of the longitudinal pulsation of the magnetic flux, a longitudinal section, a shift of the movable part by the value of t.

The linear electric motor of constant current, built into the frame 1 of the metalworking machine, consists of two rows of magnetic cores of the fixed part, fixed on both sides of the internal part of the frame with a shift of one row relative to the other by the magnitude of the pole division. , the length of each of which and the size of the gap between them are equal to the pole division t. Each element of the fixed part of the magnetic circuit is made in the form of a core 3 with a pole tip 4 and is located along the length of the bed in the section 2 v. On the core 3 there is an excitation winding 5. On the surface of the tip 4 facing the movable part there are grooves for laying the core winding 6. Tips 4, the number of which is determined by the required thrust of the linear motor, are installed next to each other a shift of one row of elements in relation to the pole division. Such a jerk allows you to obtain, at any moment of time, counter-compress the directions of the winding currents of 6 cores of each of the arcs in its frontal parts; In this case, the reaction flows koro-.

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The boom parts of both stator rows completely compensate each other and do not affect the main magnetic flux Fo, to ensure the participation in the creation of the rcBCtro efforts of all elements, the extreme magnetic conductors compensate for the axial displacement with ferromagnetic attachments 7. with a metal-working machine table 9 (FIG. 3).

In such an engine, there is no flow of reaction of the cores of the frontal winding parts, which is caused by the opposite direction of the currents of these parts in each of the rows of the fixed part. However, when the prismatic magnetic cores are shifted from the original part shown in FIG. 1, by the pole division C (Fig. 2), in the gap between the elements is one less than the elements of the moving part. The alternating number of magnetic cores of the moving part located in the stator gap occurs through each pole division T along the course of the machine, which causes longitudinal pulsations of the main magnetic flux and the engine pulling force and its speed.

Increasing the uniformity of linear linear motor motors by eliminating both the longitudinal ripple of the main magnetic flux and the longitudinal reaction of the frontal parts of one of the rows of stator elements (for example, the upper one) can be supplemented on one side with a two pole width extension, then the other (for example, the lower one) must be supplemented with two prefixes on both sides with a width of pole division each.

This engine is presented in figure 4, 5.

It can be seen that in one and in another position the number of moving prismatic magnetic cores in the gap between the rows of elements is the same. Consequently, the areas of moving elements, through which the main magnetic flux F o closes, remain constant at any moment in time, which ensures the absence of its longitudinal ripple. .

The proposed engine works as follows.

Claims (1)

With the directions of the currents of the crust winding b and the main magnetic flux F o, the electromagnetic force arising in accordance with the law of Bio-Savart-Laplace is directed to the right and left of the moving part. Under the action of this pin, the moving part of the linear motor begins to move to the left. The electromechanical or semiconductor switch switches the current in sections of the winding 6 of the core in such a way that current elements of the same direction flow in the same direction in the conductive elements that are currently against the ferromagnetic prismatic magnetic semiconductor. In order to reverse the motor, it is necessary to change the direction of the current in the main winding or in the motor excitation winding to the opposite. The engine also works in a similar way, the constructive scheme of which is shown in Fig. 4. Claims of the invention Linear electric motor containing a U-shaped ferromagnetic frame, on opposite sides of which pole 70 cores with an impulse winding and a working winding are placed against each other and pipsing (1st part containing ferromagnetic cores fixed on a non-magnetic strip, which are in the direction of motion have a length equal to the pole division, and spaced from each other at a distance equal to, characterized in that, in order to increase the uniformity of movement, the active surfaces along The long cores of the ferromagnetic frame are displaced relative to each other in the longitudinal direction by the magnitude of the division pole L, while the extreme pole core on each side of the U-shaped frame, located on the side opposite to the shear direction, is provided with a ferromagnetic attachment equal to the pole division t. ,, taken into account in the examination 1. UK Patent No. 4.207233., class H 02 K 41/02, H 2A, 197O. 2.ftuEE.Schwe-iz. eEektrxjtechn.vep 1972 63, No. 23, p. 1338-1344. J 5J  iput. one " P (ff, 2t yy 2C  and (Put.