SK500832013U1 - The body of the rotor magnetic lifting device - Google Patents

Description

Rotor housing for magnetic lifting device

Technical field

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 in the 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 stainless 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 expensive to manufacture.

From EP 1 003 625 (WO0019990656 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 supported for insertion of magnets on a suitable pad to ensure correct positioning of the magnets. These magnets must be properly secured in the rotor, either by gluing or potting, while the bottom of the groove must be secured against leakage of the sealing compound. 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

The above-mentioned 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 a 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 part 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, firm 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 against the impassable groove is flattened;

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 T1, which is fitted with a first cylindrical part 2 and a second cylindrical part 3. In the cylindrical part 1.1 of the body 1 there is formed at least one impassable groove 4 with a bottom 4.1 and side walls T2 (pocket). Permanent magnets 5 are mounted in the non-passage groove 4, which are fixed in this groove 2 against being dislodged by the potting compound (FIG. 4). These permanent magnets 5 are mounted opposite the permanent magnets of the stator of the magnetic lifting device (not shown). The thickness of the bottom wall 4.1 and the thickness of the side walls 4.2 of the impassable groove 4 is 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 mentioned above, 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 of the stator (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 part 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 grooves 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 and thus make these ends magnetically inactive while at the same time shortening the magnetic flux of the rotor. The groove 4 (pocket) formed in the cylindrical portion 1.1 of the rotor body 7 forms an enclosed space which allows the use of liquid encapsulating materials without any further use of 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).

Claims (3)

A rotor body (1) for a magnetic lifting device (1) is formed as a monoblock of magnetically conductive material and consists of a cylindrical part (1.1) fitted with a first cylindrical part (2) and a second cylindrical part (3), characterized in that in the cylindrical part (1.1) of the body 1 is formed at least one impassable groove (4) with a bottom (4.1) and side walls (4.2), wherein between the end walls (1.2) the cylindrical part (1.1) of the body (1) and the first and second cylindrical the recess (6) is formed by the part (2, 3). 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. .