SU1188833A1 - Linear d.c.motor - Google Patents

Abstract

1. LINEAR DC MOTOR MOTOR, containing the stator magnetic conductor, made in the form of two parallel rods connected by two magnetically conducting sections and covered by coils of the distributed winding, and a movable permanent magnet between the rods, the poles of which are facing the magnetic rods, different in that that, in order to fully reduce the mass and increase the uniformity of the developed gravity force, one magnetic conductive section connects the lateral side of the end of the first rod sta- ode, the torus to the side of the beginning of the second, and another conductive portion of the magnetic core - the lateral side of the rod to the first stator yoke with the second lateral side end. 2. An electric motor according to claim 1, differing in the fact that, in order to increase the stroke length, it is equipped with a third rod with a winding enveloping it and located parallel to the first two, second moving permanent magnet, located between the third and adjacent rod, and two magnetic conductive sections, one of which connects the side of the beginning of the third rod with the side of the end of the adjacent rod, and the second side of the end of the third rod with the side of the beginning of the adjacent rod, while the moving 00 00 00 permanent magnets are turned by the poles of the same polarity to the middle rod. with

Description

11 The invention relates to electrical engineering, in particular, to electric drives used to move the tonearms in information recording and reproducing devices. The purpose of the invention is to increase the uniformity of the developed tractive effort and reduce the mass. Fig. 1 shows an electric motor with two rods of a stator magnetic circuit; in fig. 2 - paths of magnetic flux closure in an engine with two rods; in fig. 3- electric motor with three rods of the stator magnetic circuit; in fig. 4 shows the paths of magnetic flux closure in an engine with three rods of a magneto wire. The linear electric motor contains two rods 1 and 2 connected to each other by magnetic conductive sections 3 and 4 extending from the side of the end of the first rod 1 to the side of the beginning of the second rod 2 and from the beginning of the side of the first 1 to the side of the end of the second rod 2. The winding of the core 5 is uniformly wound on each rod, with the turns of that winding covering each of the rods. The winding is designed in such a way that the direction of the currents on the surfaces of the rods facing each other are the same. Between the rods there is a permanent magnet 6, turned by its poles towards the rods. The magnet can be kept from lateral and vertical movements with its enclosing frame on the rollers supported on the magnetic conducting sections 3 and 4 (the frame and the rollers in FIG. 1 and 2 are not shown). For ease of construction and motor assembly, the magnetically conductive portions 3 and 4 can be made attached to the rods using screws or magnetic glue after winding the windings and installing a permanent magnet. . The engine design ensures complete symmetry and closure of the stator magnet drive, eliminating additional magnetic masses at the ends as the magnet moves. However, regardless of the position of the magnet, the resistance to magnetic flux remains unchanged. With the inequality of 32 kVs on the rods, a leveling flow in a closed loop appears, leveling the total MDS and providing constant induction between the rods. Since the flow of a permanent magnet (in Figs. 1 and 2, the flow path is shown by a dotted line), the entrance to the rod splits into two equal parts, one of which turns in one direction, and the other in another, the cross section of the rod is calculated to half magnetic flux, i.e. can be chosen half as large. FIG. Figure 3 shows an electric motor with three stator magnetic core rods (third rod 8) carrying a winding. The movable part of this motor is made up of two permanent magnets 6 and 7 located between rods 1 and 2, 1 and 8 and facing the poles of the same polarity towards the central rod. The magnets can be kept from lateral vertical displacements by covering the frames on the rollers supported on the magnetically conducting portions 3 and 4 (the frames and the rollers are not shown). For ease of construction and motor assembly, the magnetically conductive portions 3 and 4 can be made attached to the rods with screws or magnetic glue after winding the windings and installing permanent magnets. The engine design provides complete symmetry and closure of the stator magnetic circuit, excluding additional magnetic masses at the ends as the magnets move. However, regardless of the position of the magnets, the resistance to the magnetic flux remains unchanged. If the turns on the rods are not equal, an equalizing flow in a closed loop appears, leveling the total MDS and ensuring the induction constancy between the rods. The engine works as follows. . In the presence of current in the winding, a tractive force F 4wBbI is created, where B is the magnetic induction created by the permanent magnets in the gaps between the magnets 7 and 6 and the rods 1, 2 and 8; b is the width of the rod (magnet) in the direction perpendicular to the movement; I is the current in the winding conductor; W - the number of turns on the plot of the magnet. . Under the action of a thrust force, the magnet moves, moving the executive body bonded to it. The full symmetry of the magnetic circuit, its closure on the stator and the absence of additional magnetic masses create the conditions for constant pulling force, regardless of the position of the magnets. Reducing the cross section of the rod, a smaller turn length determines the reduction in the total mass and power consumption of the engine per unit developed pulling force. The presence of two permanent magnets allows for the same general; 1 Magnetic flux reduce by half the axial length of the magnet. Accordingly, by the magnitude of the decrease in the axial length of the magnet, the stroke of the motor increases. The reduced cross section of the magnetically conductive portions 3 and 4 reduces the influence of lateral scattering fluxes and thereby increases the uniformity of the pulling force.

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Claims (2)

1. LINEAR DC MOTOR, containing a stator magnetic circuit, made in the form of two parallel rods connected by two magnetically conducting sections and covered by turns of a distributed winding, and a movable permanent magnet located between the rods, the poles of which are facing the magnetic core rods, characterized in that, for the purpose of to reduce the mass and increase the uniformity of the developed traction force, one magnetically conducting section connects the side of the end of the first rod of the magnetic circuit a-, a torus with a lateral side of the beginning of the second, and another magnetically conducting section - the lateral side of the beginning of the first rod of the stator magnetic circuit with the lateral side of the end of the second. 2. The electric motor according to claim 1, characterized in that, in order to increase the stroke length, it is equipped with a third rod with a winding covering it and parallel to the first two, second movable permanent magnet located between the third and neighboring rod, and two magnetically conductive sections, one of which connects the lateral side of the beginning of the third rod with the lateral side of the end of the adjacent rod, and the second lateral side of the end of the third rod with the lateral side of the beginning of the adjacent rod, while the movable constants magnets are facing the poles of the same polarity to the middle rod. OO 00 00 co