DE102006018262A1 - Electric motor for e.g. sawing of plate-shaped bodies, has disk-shaped rotor with asymmetrically arranged rotor disk, and permanent magnets fastened at rotor disk and at processing and sawing tools - Google Patents

Abstract

The motor has a disk-shaped rotor with an asymmetrically arranged rotor disk (2), and permanent magnets (1) fastened at the rotor disk and at processing- and sawing tools (6). The mass of the rotor disk comprises fourty percentage of the weight of the motor. A rear wall is cooled by removing dust in the rear wall such that a channel (5) is formed in an area of the rear wall, where suction air flows along the rear wall for cooling the rear wall.

Description

main claim

The The invention relates to a narrow machining motor for sawing, milling or otherwise cutting plate-like bodies, in the places where with the conventional ones Three-phase motors space problems exist. This is achieved by the use of a disc rotor in a special design.

description

Known are editing engines for Machine tools of the wood and building materials industry, in the form of three-phase cross-country motors are constructed. These engines have the advantage that by Machining of the radial forces generated by the tools taken at least two axially far apart camps (eg installation length 300-600 mm). Remotely located bearings ensure a long service life of the drive.

There due to narrower products narrower engines are used have to, was on long-lasting three-phase motors with upstream angular gear dodged. By using the angular gear, the overall length in the axial direction is clear reduced.

The Axialeinbaulänge this angle gear is in a performance range of 4-11 kW z. B. 170-200 mm.

It However, there is the disadvantage that the required services those with oil filled Bevel gear to heat up and the seals against the Motor have a limited life. In addition, the axial distance the camp greatly reduced, which is due to increased burden on the same a reduced life leads. Out For this reason and due to the need for narrower processing units (eg axial installation dimension 70-90 mm) an axially narrow engine is developed which does not the disadvantages of three-phase motors with upstream angular gears has.

The invention relates to a running as a pancake, permanently excited synchronous servo motor. These electric motors are known from practice as highly dynamic positioning drives or z. B. also known as pump drives. They have as secondary parts with magnets ( 1 ) disk rotors ( 2 ) and as a primary part a stator ( 7 ).

Around The drive is designed to save space, is the disc rotor at the same time as a receptacle for the magnets and the corresponding Machining tool provided. This results in a space-saving, but asymmetrical construction. The width of the engine can at a Performance size of approx. 3-7 kW be reduced to about 80 mm width.

By the asymmetric attachment of the magnets to the rotor, d. H. one-sided assembly of the abutment With permanent magnets, the secondary part becomes strong axially to the primary part drawn. If one considers the forces acting axially, then that the radial machining forces represent a fraction of the permanently existing axial magnetic force.

The Invention is the rotor tool holder and their storage to arrange such that despite the shortest axial distance of the bearings, a long life of the engine is achieved.

Warehouse 1 ( 3 ) for receiving the radial forces in the area of the sawing or processing unit is installed in flight or in the immediate vicinity of the machining tool, while the second bearing ( 4 ) is attached to the other extremity of the engine.

To the Use are preferably tapered roller bearings or, as a radial bearing, ball bearings in conjunction with a cross roller bearing for absorbing the radial forces. In order to enable this arrangement of bearings, comes an asymmetric Rotor, on the one hand the tool and on the other hand the magnets wearing, for use.

There In this compact design, the heat development is high and the heat dissipation due to the limited space is difficult, according to the invention used a combined form of internal and external cooling.

At a suitable point compressed air is introduced into the closed motor housing, which exits through a labyrinth seal between the rotor and housing and prevents the ingress of dust. In addition, the dust extraction, which removes the chipped material and passes through a high volume of air (eg 1600 cbm / h at a speed of about 30 m / s), used for cooling the outer walls. On the back of the motor, where the largest heat is generated by the stator winding, is through a channel ( 5 ) Passed a portion of the exhaust air along the housing and this cooled. Furthermore, the dust extraction in the area of the rotor is used by means of suitable formations in order to cool it.

State of technology

Disc rotor motors are used in particular where a small length-diameter ratio is required. For this reason, there are pancake in the similar design for pumps, z. B. in a patent of the company Siemens AG - DE 102 03 778 - from 01/2002 or the description of a fuel pump from Mannesmann in patent no. DE 196 174 95 , from 05/1996. The described pancake drive pumps.

In patent no. DE 102 004 05 578 , from LUK company Lamellen- and coupling construction, a pancake is described, which corresponds in structure to the pancake for processing units of the present invention. However, the storage can only be used when installed with a coupling.

In the published patent application DE 199 17 408 , from the company Baumüller, from 04/1999, a pancake is described, in which, similar to the invention, the rotor is designed with a single large-sized cross roller bearing. Compared to this version, the rotor is designed with a large-sized ball bearing for higher speeds to accommodate the vertical and radial forces. In addition, the rotor is designed so that dust from the ball bearing can be kept away by sealing air and a labyrinth seal.

In the published patent application DE 35 28 303 the VEB Kombinat Robotron describes an asymmetric pancake motor similar in construction to the described invention; however, includes a separate receptacle for a flexible magnetic disk.

In the patent DE 199 53 485 The company Oechsler is described a flat gear motor, which is also equipped with asymmetric rotor described.

Claims (5)

Electric disc rotor motor with asymmetrically arranged rotor disc ( 2 ) characterized in that on the one hand permanent magnets ( 1 ) on said rotor disk and on the other hand, machining and sawing tools ( 6 ) are attached. Disc rotor motor according to claim 1, characterized in that the mass of the rotor disc ( 2 ) occupies over 40% of the weight of the entire motor and high kinetic energy is achieved by the kenetic energy during intermittent operation. Disc rotor motor according to claim 1-2, characterized in that due to the short axial design, the storage with 2 or more angular contact ball or tapered roller bearings ( 3 ) and ( 4 ), which are arranged so that the extension of the ball pressure lines outwardly beyond the periphery of the pancake motor out and thereby lie the arithmetically radial force application points outside the motor. Disc rotor motor according to claim 1-3, characterized in that the cooling takes place with the aid of the dust extraction in such a way that in the region of the rear wall a channel ( 5 ), whereby the exhaust air flows along the rear wall and thus represents the cooling of the rear wall. Disc rotor motor according to Claims 1-4, characterized in that, in order to prevent the entry of dust into the engine, compressed air is applied at a suitable point ( 8th ) is introduced into the housing and this compressed air through a suitably designed labyrinth seal ( 9 ) exits between housing and rotor, thus transporting the dust in to the outside.