SI23463A - Fixing of a permanent magnet in the rotor of a hybrid synchronous electric motor - Google Patents

Abstract

The invention relates to a construction of fixing and safeguarding of permanent magnets which are inserted in a rotor of a synchronous motor for run-in momentum increase and also for improving the effectiveness of such a motor. Magnets (5) are freely inserted into the rotor grooves (3) and their axial movement is at least on one side of the rotor core (1) limited with an internal snap-in ring (6) inserted in a snap-in ring (6) optionally a spring washer (7) adapted groove (10) where the groove (10) is in a part of a cage in front of the grooves for the magnets (5).

Description

The subject of the invention is the attachment of a permanent magnet in the rotor of a hybrid synchronous self-starting electric motor, that is, the construction and manufacture of a rotor of a synchronous self-starter electric motor with a short-cage and permanent magnets mounted in the rotor and fixed with internal terminals472 ).

Known solutions are set forth in U.S. Patent No. 6,954,018 B2; US 5,350,958 A; US 5,581,140 A; US 5,936,323 A; US 6,727,627 BI, however, not all of these solutions provide a disassembled rotor assembly and permanent magnets. The solutions mentioned in these patents do not cover the embodiment of the internal coupler according to the invention.

The object and purpose of this patent is to provide a permanent magnet rotor construction that provides two inner splines with a minimum cross section of the rotor core due to the selected mounting technique, the independence of the cross section and the resistance of the rotor short-circuits from the selected mounting technique of the inner fittings, to remove any ferromagnetic impurities present whether they occur during technological processes of rotor fabrication prior to permanent magnet assembly, installation of pre-magnetized permanent magnets into the rotor core after complete rotor fabrication and all mechanical rotor machining, installation of internal couplers without interfering with the cross section of the rotor core, disassembly of the rotor - magnets, thus allowing servicing of the rotor - magnets. , this is the replacement of the rotor magnets without the use of demanding technological procedures, the ecological decomposition of the rotor, that is, the separation of permanent magnets from other components or. rotor assembly without the use of sophisticated disassembly techniques or energy-consuming procedures and, where necessary, using spring or other washers eliminates clearance due to manufacturing tolerances between the length of the rotor core and the length of permanent magnets.

The object of the invention is solved according to an independent patent claim.

-2 The invention is described and shown in the embodiment and in the drawings showing:

Figure 1: an outline of a motor rotor with a modified short-circuit ring adapted for mounting a magnet and an internal clamp,

Figure 2: cross-section of the rotor core with a slot for the fitting,

Figure 3: Assembly of the rotor with magnets secured by an internal snap-in,

Figure 4: Magnetic rotor assembly, secured by an internal snap and spring washer.

The motor rotor consists of a lamellar rotor core 1 which is shaped into the core by a welding process and / or interlocking ribs and / or glued and / or other binder interconnected blades. The rotor core 1 has a large number of rotor grooves 2 into which copper conductor electrical conductors are inserted or cast by a process of die casting of aluminum or other electrically conductive aluminum alloys. Copper or aluminum rotor conductors are interconnected on either end of the rotor by a short-circuit plate or short-circuit ring 4. A plurality of permanent magnets 5 can be inserted into the additional rotor cores 3 in the axial direction 3, which can be of any geometry, depending on the product. qualities and geometric orientation. In the axial direction, the magnets 5 are centered along the lamellar rotor core 1 by means of grooves 3. At least at one or both ends of the rotor, the short-circuited ring 4 is designed to allow the insertion of magnets 5 into the grooves 3, while at the same time in the cage part magnet grooves, ie where there are no magnet grooves and the cage may have a smaller diameter, a groove 10, preferably according to DIN 472 for the inner fitting 6 to the same standard, depending on the rotor diameter available. The groove 10 is sized and configured to accommodate the inner coupler 6. The same detail is provided at one or both ends of the rotor. Inner snap 6, preferably according to DIN 472, prevents magnets 5 from moving axially or falling out of the rotor. In the case of excessive axial play, due to different coefficients of linear temperature expansion and associated dilations and / or manufacturing tolerances of the length of the rotor core 1 and magnets 5, spring washers may be placed under the inner lugs 6, that is, in the space between the lugs 6 and the magnets 5. 7, which eliminates any axial clearance of the magnets. In this case, the groove 10 is appropriately wider so that it can accommodate the clamp 6 and the washer 7. In most cases, no additional washer will be required, since the magnets will be positioned correctly.

-3 their magnetic force. In the center of the rotor, in the axial direction, a bore for the rotor shaft 8. The bore for the rotor shaft 8 may be unilaterally or bilaterally extended to allow the rotor to be mounted on a shaft in which one or both of the motor bearings are located in area 9. counter bore holes) under the core of 1 rotor. In these cases, in the area of enlarged rotor bores, the cross section of the lamellar rotor core 1 is magnetically - conductively reduced to the minimum permissible.

In the case of using only one plug, the magnets on the opposite side are limited in known ways by the design of the rotor core itself.

The fastening according to the invention is thus characterized in that the magnets 5 are freely inserted into the grooves 3 of the rotor and their movement in the axial direction on at least one side of the rotor core 1 is limited by an inner lug 6 inserted in the lug 6 and an optional spring 7 adapted groove 10, the groove 10 being in the portion of the cage in front of the magnet slots 5.

The groove closure 3 for permanent magnets with inserted magnets 5, using internal couplers 6 according to the invention, is applicable to all rotors where permanent magnets are mounted as an independent part of the rotor.

Claims (1)

PATENT APPLICATION 1. Attachment of a permanent magnet in the rotor of a hybrid synchronous electric motor with a short-circuit cage and permanent magnets mounted grooves in the rotor, characterized in that the magnets (5) are freely inserted into the grooves (3) of the rotor and their movement in the axial direction is at least on one side the rotor core (1) is limited by an inner clip (6) inserted in the clip (6) and an optional spring washer (7) with a groove (10), the groove (10) being in the cage portion in front of the magnet slots (5).