SK6776Y1 - The body of the rotor magnetic lifting device - Google Patents

Abstract

Body (1) for lifting the rotor magnet device is designed as a compact of magnetically conductive material and consists of the cylindrical part (1.1) by fitting a first cylindrical section (2) and a second cylindrical portion (3), wherein the cylindrical part (1.1) of the body (1) is formed impassable groove (4) with bottom (4.1) and side walls (4.2) and the end walls of the cylindrical part (1.1) of the body (1) and a first and a second cylindrical portion (2,3) is formed recess (6 ).

Description

The technical solution relates to a rotor body for a lifting magnet device with permanent magnets.

BACKGROUND OF THE INVENTION

Known embodiments of the rotor body for lifting magnets are designed as a weldment consisting of two flat magnetically soft materials between which a gap is inserted for the insertion of permanent magnets. These materials are welded to the two ends that form the front and rear ends of the rotor body, which ends are made of a stainless steel material that is magnetically nonconductive. These ends are supported by bearings in the stator. This is a very good solution in terms of magnetic properties, but it is laborious and costly to produce.

From EP 1 003 625 (WO019990656 A1) a rotor body solution is known which is made of one piece of magnetically soft material. A through groove is formed into the cylindrical rotor body for the insertion of permanent magnets. The rotor must be mounted to place the magnets on an appropriate support to ensure that the magnets are positioned correctly. These magnets must be properly secured in the rotor, either by gluing or by embedding, while the bottom of the groove must be secured against leakage. Although measures are taken to keep the pouring compound out of the groove as little as possible, it is not possible to ensure that there is no leakage of the compound, so that the flow of the compound or adhesive must subsequently be eliminated.

The essence of the technical solution

Said disadvantages of the known solutions of the rotor bodies are largely eliminated by the rotor body according to the invention, which is formed as a monoblock of magnetically conductive material and consists of a cylindrical part fitted with a first cylindrical part and a second cylindrical part. The principle of the technical solution consists in that at least one non-passable groove is formed in the cylindrical part of the body with the bottom and side walls (pocket), whereby a recess is formed between the front walls of the cylindrical part of the body and the first and second cylindrical parts. In order to improve the magnetic flux of the permanent magnets of the rotor, it is advantageous to create a flattening on the outer cylindrical parts of the body in the bottom part of the impassable groove along its entire length and width. The wall thickness of the bottom and side walls of the impassable groove and the groove dimensions are chosen according to the performance parameters and the dimensions of the rotor.

The advantage of the technical solution is the simplicity of production and cost savings in the production of the rotor, fixed and stable fixation of permanent magnets of the rotor in the impassable groove of the stator, use of liquid encapsulating materials without any further use of jigs or molds.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated in greater detail in the accompanying drawings, in which: FIG. 1 is a perspective view of a rotor body with a fixed slot;

Fig. 2 is a rear view of the rotor body;

Fig. 3 is a section AA taken along FIG. 2;

Fig. 4 is a perspective view of a rotor body with permanent magnets embedded in the impassable groove;

Fig. 5 is a rear view of the rotor body shown in FIG. 4;

Fig. 6 is a sectional view of FIG. 5;

Fig. 7 is a rear view of the rotor body where the wall of the cylindrical portion is flattened against the impassable groove;

Fig. 8 shows a section CC taken along FIG. 6th

EXAMPLES

The rotor body 1 for the lifting magnetic device is formed as a monoblock of one piece of magnetically soft material. The body 1 consists of a cylindrical part 1.1, which is fitted with a first cylindrical part 2 and a second cylindrical part 3. At least one impassable groove 4 is formed in the cylindrical part 1.1 of the body 1 with the bottom 4.1 and the side walls 4.2 (pocket). Permanent magnets 5,

SK 6776 Υ1 which are fixed in this groove 2 against being dislodged by the casting compound (Fig. 4). These permanent magnets 5 are mounted opposite the stator permanent magnets (not shown) of the magnetic lifting device. The thickness of the bottom wall 4.1 and the thickness of the side walls 4.2 of the impassable groove 4 are chosen according to the performance parameters and the dimensions of the rotor (magnetic lifting device), these wall thicknesses must minimize the resulting magnetic field of the rotor 10. rotor.

The cylindrical part 1.1 of the rotor body 1, as already mentioned, is provided with a first cylindrical part 2 and a second cylindrical part 3, which extend outside the magnetic field formed between the permanent magnets 5 of the rotor and the permanent magnets not shown. The two parts 2, 3 are fitted with bearings (not shown) which are housed in the stator housing of the magnetic lifting device. A second cylindrical part 3 is associated with a cylindrical part 4 with a through hole 8 through which the control lever of the magnetic lifting device (not shown) is guided.

In order not to affect the resulting magnetic flux of the permanent magnets 5 of the rotor, a recess 6 is formed between the end walls 1.2 of the cylindrical part 1.1 of the body 1 and the first and second cylindrical parts 2, 3 (Figs. 2, 5 and 7). The diameter and width of the recess 6 is selected with respect to the performance parameters and dimensions of the rotor, and it is advantageous to minimize these dimensions. These recesses 6 form the magnetic field of the rotor so that they do not occur at the ends 2, 3 and 4 which extend out of the lifting magnet, thereby making these ends magnetically inactive while minimizing the magnetic flux of the rotor. The groove 4 (pocket) formed in the cylindrical portion 1.1 of the rotor body 1 constitutes an enclosed space which allows the use of liquid encapsulating materials without any further use of the formulations or molds to prevent leakage of the encapsulating material and at the same time does not require subsequent processing.

In order to improve the magnetic flux of the permanent magnets of the rotor, a flattening 7 is formed on the outer cylindrical part 1.1 of the body 1 in the bottom part 4.1 along the entire length and width of the groove 4 (FIGS. 7 and 8).

PROTECTION REQUIREMENTS

Claims (3)

A rotor body (1) for a magnetic lifting device formed as a monoblock of magnetically conductive material and comprising a cylindrical part (1.1) fitted with a first cylindrical part (2) and a second cylindrical part (3), characterized in that of the cylindrical part (1.1) of the body 1 is formed by at least one impassable groove (4) with a bottom (4.1) and side walls (4.2), wherein between the end walls (1.2) of the cylindrical part (1.1) of the body (1) and first and second cylindrical parts (2, 3) a recess (6) is formed. Body (1) according to claim 1, characterized in that a flattening (7) is formed on the outer cylindrical part (1.1) of the body (1) in the bottom part (4.1) along the entire length and width of the groove (4). Body (1) according to claim 1 and 2, characterized in that the wall thickness of the bottom (4.1) and the side walls (4.2) of the impassable groove (4) and the groove dimensions (6) are selected according to the performance parameters and the rotor dimensions.