NL2011225A

NL2011225A - Rotor body for magnetic lifting device.

Info

Publication number: NL2011225A
Application number: NL2011225A
Authority: NL
Inventors: Vojtech Zencak
Original assignee: Zenc Kov
Priority date: 2012-10-25
Filing date: 2013-07-26
Publication date: 2014-04-29
Also published as: SK6776Y1; NL2011225C2; SK500832013U1; DE202013103439U1; CZ24690U1

Description

Rotor body for magnetic lifting device

Technology field

The technical solution

Current state of the art

Known designs of the rotor body in lifting magnets are designed as a weldment consisting of two flat soft-magnetic materials with a gap for permanent magnets. These materials are welded to two ends forming the front and rear end of the rotor body, whereas the two ends are made of stainless steel material which is magnetically non-conductive. These ends are installed in stator on bearings. With respect to magnetic properties, this is a very good design, it is however very costly and associated with high labor requirements

From EP 1 003 625 (W00019990656 A1) we are aware of the design of rotor body, made of a single piece of soft-magnetic material. A through slot is made in the cylindrical body of the rotor, for installation of permanent magnets. The rotor must be placed on a suitable support for installation of magnets, to ensure correct magnet position. These magnets must be duly secured in the rotor - either by gluing or bonding, ensuring that the bottom part of the slot is sealed to prevent the bonding material from flowing out. In spite of measures to ensure minimum leakage of the bonding material, it is impossible to absolutely prevent the leakage, therefore any leaked material or adhesive must be removed afterwards.

The basis of the technical design

The above disadvantages of the known designs of rotor body are mostly eliminated by the proposed design of rotor body, designed as a monoblock made of magnetically conductive material, consisting of a cylindrical part fitted with the first and second cylindrical components. The basis of the technical design involves at least one blind slot with bottom and side walls (pocket), whereas a recess has been created between the faces of the cylindrical parts of the body and the first and second cylindrical part. With respect to improvement of the magnetic flow of the permanent magnets of the rotor, it is better to create a flat surface on the outside of the cylindrical part of the body in part of the bottom of the blind slot along its entire length and width. Thickness of the bottom and side walls of the blind slot and the dimensions of the recess are proposed according to performance parameters and rotor dimensions.

The advantage of the technical design is the simplicity of the manufacturing and saving of costs involved in the manufacturing of the rotor, solid and stable fixation of the permanent magnets of the rotor in the blind slot of the stator, application of liquid bonding materials without any other accessories or forms necessary to prevent the outflow of the bonding material, and there is no need for processing of the run out material.

Overview of the figures in the drawings

The technical design is clarified on the attached drawings, that depict: fig. 1 - perspective view of the rotor body with blind slot fig. 2 - rear view of the rotor body fig. 3 - view of AA cut through fig. 2 fig. 4 - perspective view of the rotor body with permanent magnets placed in the blind slot fig. 5 - rear view of the rotor body depicted in fig.4 fig. 6 - view of BB cut through fig. 5 fig. 7 - rear view of the rotor body, where the wall of the cy lindrical part opposite the blind slot is flattened fig. 8 - view of CC cut through fig. 6 Examples of design

Body 1 of rotor 10 for lifting magnetic devices consists of a monoblock - a single piece of soft - magnetic material. Body 1 consists of cylindrical part 1.1, fitted with the first cylindrical part 2 and second cylindrical part 3. In the cylindrical part 1.1 of the body 1 there is at least one blind slot 4 with bottom 4.1 and side walls 4.2 (pocket) In the blind slot 4 there are permanent magnets 5, which are attached in this slot 2 to prevent sliding, with a bonding material (fig.4). These permanent magnets 5 as set opposite the non-viewed permanent magnets of the stator of the magnetic lifting device. Thickness of the wall of the bottom 4.1 and side walls 4.2 of the blind spot4 is selected according to performance parameters and rotor dimensions (of the magnetic lifting device) , whereas the resulting thickness must have least possible effect on the magnetic field of rotor 10, while maintaining the structural strength of the body 1 of rotor.

The cylindrical part 1.1 of the body of rotor 1, as mentioned previously, is fitted with the first cylindrical part 2 and second cylindrical part 3, protruding outside of magnetic field between permanent magnets 5 of the rotor and non-viewed permanent magnets of the stator. These two parts 2, 3 are fitted with non-viewed bearings installed in the body of the stator of the magnetic lifting device. The second cylindrical part 3 is fitted with cylindrical part 4 with a through hole 8, for the non-represented lever of the magnetic lifting device .

In order to prevent the influence on the resulting magnetic flow of the permanent magnets 5 of the rotor, between the face walls 1.2 of the cylindrical part 1.1 of the body 1 and the first and second cylindrical part 2, 3 a recess 6 is created (fig. 2, 5 and 7). The diameter and width of this recess 6 is based on the performance parameters and dimensions of the rotor, whereas it is beneficial to minimize these dimensions. These recesses 6 shape the magnetic field of the rotor so that it does not appear at ends 2, 3 and 4, protruding from the lifting magnet so that the ends are magnetically inactive and to prevent the shorting of the rotor magnetic flow. The slot 4 (pocket) in the cylindrical part 1.1 of the body 1 of rotor 10 represents an enclosed space enabling the use of liquid bonding material without the need to use any other accessories or forms to prevent outflow of the bonding material and there is no need for additional processing of the run out material.

In order to improve the magnetic flow of the permanent magnets of the rotor, on the outside cylindrical part 1.1 of the body 1 in part of the bottom 4.1 along the entire length and width of the slot 4 a flattening 7 has been made ( fig. 7 and 8) .

Claims

A body (1) of a rotor (10) for a magnetic hoisting device, comprising a monobloc of magnetically conductive material with a cylinder section (1.1) equipped with a first cylinder section (2) and a second cylinder section (3) characterized in that in the cylinder section (1.1) of the body (1) at least one blind groove (4) with a bottom (4.1) and side walls (4.2) is made, wherein between front walls (1.2) of the cylinder part (1.1) of the body (1) and the first and second cylinder part (2, 3) is made into a groove (6).

Body (1) according to claim 1, characterized in that a flattening (7) is formed on the outer cylinder 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 claims 1 and 2, characterized in that the thickness of the bottom wall (4.1) and side walls (4.2) of the blind groove (4) and the dimensions of the groove (6) are selected on the basis of performance parameters and rotor dimensions to be.