Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/22—Rotating parts of the magnetic circuit
  • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
  • H02K1/246—Variable reluctance rotors
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/22—Rotating parts of the magnetic circuit
  • H02K1/27—Rotor cores with permanent magnets
  • H02K1/2706—Inner rotors
  • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
  • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets

Definitions

• the invention relates to a rotor of a synchronous machine, in particular a reluctance machine, according to the preamble of claim 1.
• WO 2009/063350 A2 shows a rotor of a reluctance motor in which pronounced magnetic poles are formed by flow barriers in the rotor laminated core. Permanent magnets are embedded in these flow barriers. This arrangement of the permanent magnets affects the magnetic field in the rotor only to a limited extent by the field in the direction of the q-axis is amplified. In particular, this causes an increase in the power factor of the machine, the power density is thereby influenced only insignificantly.
• DE 10 2008 057 391 A1 proposes a synchronous machine in which the rotor has pronounced magnetic poles which generate a square-wave torque.
• permanent magnets are provided here, which ensure a displacement of the magnetic flux due to their arrangement in the rotor, so that a superposition of the reluctance torque and the magnetic torque leads to a maximum amplitude of the resulting torque.
• this arrangement has the disadvantage that the rotor is not symmetrical, which is why the effect achieved can only be used in one direction of rotation.
• the present invention is based on the object to provide a rotor of a synchronous machine, in particular a reluctance machine, overcomes the aforementioned disadvantages and achieves an increase in the magnetic properties of the rotor and thus a significant increase in power density while preserving the symmetry.
• the solution of the problem provides that in the d-axis of the rotor recesses are provided, in which the permanent magnets are arranged.
• This has the advantage that the magnetic field is amplified by the permanent magnets in the region of the d-axis.
• the arrangement of the permanent magnets the power density of the machine is significantly increased and the symmetry of the rotor is maintained, so that the rotor can rotate in both directions and each of the advantages of the inventive arrangement of the permanent magnets come into effect.
• this solution has the advantage that the necessary in reluctance machines to achieve a high efficiency and a high power density minimum radial air gap between the stator and rotor package can be increased without sacrificing the efficiency of the engine.
• the demands made on the tolerances in the manufacture of the laminated cores are lower and the motor can also be used in applications in which a large radial air gap is necessary, for example in canned motors.
• the permanent magnets are separated from the air gap by a web, in particular by a web whose width is less than one tenth of the rotor diameter.
• a web in particular by a web whose width is less than one tenth of the rotor diameter.
• An essential requirement for the embedding of permanent magnets in the rotor is the stable positioning.
• the permanent magnets are exposed during operation of the engine centrifugal forces, which is why it is convenient to provide the magnets in the laminated core of the rotor.
• the laminated core leads to a weakening of the magnetic field, which is why the overlap of the permanent magnets with rotor plate is reduced to a necessary minimum.
• the permanent magnets are provided in a recess accessible from the air gap.
• the permanent magnets are cuboid, whereby the manufacturing cost of the synchronous machine can be significantly reduced.
• rotor magnets of various sizes can be realized in a modular manner, which considerably reduces material costs.
• the permanent magnets can be produced, which are symmetrically contoured in the axial direction. Although these are more expensive to manufacture than the above-described rectangular permanent magnets, for use on the surface of the rotor, it is advantageous to use permanent magnets, which are held by positive engagement in the AusOSE ung on the rotor surface. In the case of the rotor according to the invention, it is possible to provide additional permanent magnets in the q-axis of the rotor. As a result, the magnetic field of the rotor can be further influenced as needed.
• the rotor according to the invention is advantageously used in a multi-pole, in particular two-pole, four-pole, six-pole, eight-pole or ten-pole, reluctance machine, wherein at least one permanent magnet in the d-axis is provided for each pole.
• the permanent magnets provided in the rotor are preferably made of rare earth materials or ferrite. These permanent magnets cause due Their power densities have a beneficial effect on the magnetic properties of the rotor.
• the magnetic field of the rotor is amplified such that it is possible, the air gap between the rotor and stator in the reluctance machine can be increased compared to reluctance machines without additional permanent magnets in the d-axis.
• a rotor which has been equipped with permanent magnets according to the invention is therefore particularly suitable for use in a Spatrohr motor, in particular for the operation of a canned motor pump.
• Fig. 1 shows a sheet metal section of a reluctance motor
• FIG. 1 shows a sheet-metal section of a rotor for a reluctance motor of known design. To simplify the illustration, the stator is not shown.
• the rotor plate 1 has a plurality of flow barriers 2, by the arrangement of which a four-pole rotor is formed, in which the magnetic flux in the regions with the flow barriers 2 is inhibited.
• Several rotor laminations 1 with the illustrated sheet metal section are stacked in the direction of the axis of rotation 3, thus forming the rotor.
• This easy-to-manufacture rotor has a region of high magnetic conductivity, the d-axis d, and a region of low magnetic conductivity, the q-axis q.
• FIGS. 2a to 2d show a section of the sheet-metal section of Figure 1, wherein in the region of the d-axis according to the invention, permanent magnets are provided. These increase the magnetic conductivity in the d axes.
• FIGS. 2 a to 2 d show various positions of the permanent magnets which are the rotor give specific properties.
• a permanent magnet 4 is embedded between two iron webs and the flow barriers 2. The permanent magnet 4 sits as close as possible to the air gap between the rotor and the stator of the electric motor in order to achieve the highest possible induction. To ensure mechanical stability, 4 iron bars remain on the sides of the permanent magnet.
• the permanent magnet 4 is buried in the sheet for support against the centrifugal forces occurring.
• a permanent magnet 5 is embedded directly between the flow barriers, wherein the iron webs are spatially separated from the permanent magnet 5. This has the effect that the agnetvoiumen can be increased compared to the permanent magnet 4 shown above. The webs for mechanical stability must therefore be introduced elsewhere. As in FIG. 2a, the permanent magnet 5 is buried in the metal sheet for support against the centrifugal forces that occur.
• a permanent magnet 6 is provided at the rotor outer diameter.
• the induction can be further increased in comparison with the above examples.
• the permanent magnet can be easily inserted from the outside, which leads to simplification in the manufacture of the rotor. It may be a bandage necessary to counteract the centrifugal forces occurring and support the permanent magnet.
• a permanent magnet 7 is displaced in the direction of the axis of rotation 3 in comparison with the position of the permanent magnet 6 in FIG. 2c.
• the Magnetvoiumen can be greater than that of the permanent magnets 4, 5 and 6 shown in Figures 2a to 2c.
• the permanent magnet 7 is buried in the sheet to support against centrifugal forces occurring, To further target the magnetic field are combinations of the illustrated Magnet positions possible. LIST OF REFERENCE NUMBERS

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Permanent Field Magnets Of Synchronous Machinery (AREA)
• Iron Core Of Rotating Electric Machines (AREA)
• Synchronous Machinery (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=44906148

Family Applications (1)

Country Status (5)

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Family Cites Families (12)

• 2010
  • 2010-11-17 DE DE102010044046A patent/DE102010044046A1/de not_active Withdrawn
• 2011
  • 2011-11-04 WO PCT/EP2011/069391 patent/WO2012065857A2/de active Application Filing
  • 2011-11-04 EP EP11778625.1A patent/EP2641317A2/de not_active Ceased
  • 2011-11-04 BR BR112013012173A patent/BR112013012173A8/pt not_active Application Discontinuation
  • 2011-11-04 CN CN201180055159.8A patent/CN103384954B/zh active Active

Non-Patent Citations (2)

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