Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
  • H02K21/02—Details
  • H02K21/04—Windings on magnets for additional excitation ; Windings and magnets for additional excitation
  • H02K21/042—Windings on magnets for additional excitation ; Windings and magnets for additional excitation with permanent magnets and field winding both rotating
  • H02K21/044—Rotor of the claw pole type
• • 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
  • H02K1/243—Rotor cores with salient poles ; Variable reluctance rotors of the claw-pole type

Definitions

• the invention relates to a claw pole generator with a rotor, according to the preamble of the independent claim.
• the rotor initially comprises a magnet wheel half connected to a rotor shaft in a rotationally fixed manner and a pole carrier which is rotatably fixed to the magnet wheel half by a holding means
• the preferably magnetically non-excitable holding means is a continuous ring which is coaxial with the axis of rotation of the rotor and has a generally rectangular shape
• the pole carrier and the pole wheel half each have an approximately cylindrical recess on the inside of the claws facing the axis of rotation, into which the ring is inserted.
• the rotor of this known claw pole generator has the disadvantage, among other things, that the connection, which can also be a soldered connection, takes place approximately centrally between the pole carrier and the pole wheel half over a narrow axial area of the claws. Since the free claw pole ends are free of the collar, they can be under the centrifugal load bend outwards.
• Another disadvantage of the known claw pole generator is that the radially outward surface of the claw poles of the pole carrier and the pole wheel half is interrupted by the gaps between the individual claws with opposite poles, which reduces the dissipation of the heat loss.
• connection as previously achieved by brazing the ring to the claw poles, is now possible beyond soldering by welding, since the intended welding points are easier to reach from outside. Because the joints can be produced by means of another method, it is possible to increase the manufacturing tolerances of the components to be joined to the pole wheel half, holding means and pole carrier. This reduces, for example, the manufacturing outlay and, at the same time, the production-related scrap.
• Another advantage of the at least partial arrangement of the holding means in the claw pole spaces lies in the enlargement of the outer surface of the rotor, so that the heat dissipation is significantly improved.
• the claw pole generator according to the invention also enables a cohesive connection in the area of the free claw pole ends, so that the bending of the claws under centrifugal load is reduced. This enables a smaller air gap between the outer circumference of the claw poles and the inner circumference of the stator.
• An advantageous embodiment of the holding means is given by the connection of two holding elements bordering or adjacent to a claw pole in the region of a free claw pole end by a so-called tab. If you flip these tabs radially inward with respect to the rotor shaft axis, you get a stiffening of the holding means, which, through its connection to the claw pole, additionally stiffens the claw pole tip against expansion under centrifugal load. If you extend the holding device with the angled flap to an axial outside of the magnet wheel half until it is flush with the outside, you get an improved, less jagged outside of the rotor. A further improvement of the holding means is achieved in that it is designed as a one-piece body on which the individual holding element regions are arranged, which are located between the respective claws.
• a one-piece holding means which has an essentially cylindrical jacket-shaped structure with alternately open cutouts for the pole wheel and pole carrier claws on the pole carrier and pole wheel sides.
• a stiffening of the holding elements can be achieved in that radially inwardly directed legs extend from the ends adjoining the claw poles in a substantially circumferential direction extend.
• This structure is further improved in that two opposing legs are connected in a claw-pole intermediate space in the area of one claw-pole end each by a web, a web in the area of the pole wheel claw and a web in the area of the
• Pole carrier claw is arranged. If two legs are connected at their radially inward end by a profile closing element, this results in a closed hollow profile, which is thereby further stiffened. If two adjacent legs of two claw pole gaps are connected by a pole end web below the claw poles, the retaining means is additionally stiffened. With the aid of the holding means according to the invention, the use of permanent magnets in the spaces between two opposite-pole claw poles is also advantageous
• Permanent magnets can then be fastened, for example, to the holding means radially inside the rotor. If the holding means is formed as a hollow profile within the spaces between two claws with opposite poles, the permanent magnets can be inserted into this open hollow profile.
• FIG. 1 shows a first exemplary embodiment of a rotor of a claw-pole generator according to the invention in plan view
• FIG. 2 shows a partial section along line II-II in FIG. 1
• FIG. 3 shows a side view of a rotor according to a second exemplary embodiment
• FIG. 4 shows a sectional view along line IV-IV through the rotor in FIG. 3,
• FIG. 5 shows an alternative embodiment to FIG. 4
• FIG. 6 shows a perspective illustration of a holding means for the rotor from FIG. 3
• FIG. 7 shows a partial view of a rotor according to a third exemplary embodiment
• FIG. 8 shows a section through the rotor according to FIG. 7 according to line VIII-VIII
• FIGS. 9 and 10 show a further development of the rotor according to FIGS
• FIG. 11 shows a side view through a holding means according to a fourth exemplary embodiment
• FIG. 12 shows a partial cross section according to FIG. 11 along the line XII -XII,
• FIG. 13 shows the holding means according to the fourth exemplary embodiment, the hollow profile on the side of the pole wheel half being open;
• FIG. 14 shows a side view of the holding means according to the fourth exemplary embodiment
• FIGS. 15, 16 and 17 show different possibilities for fastening permanent magnets to the holding means
• FIG. 18 shows a longitudinal section in the upper half of the figure through a known claw pole generator in FIG Leit Glabauweise and in the lower half of the picture a side view of the rotor of this generator.
• FIG. 18 shows in the upper half of the figure a longitudinal section through a known claw-pole generator with a rotor 20 in a guide piece construction.
• the rotor 20 has a pole wheel half 22, which is connected via a ring 24 to a guide piece, hereinafter referred to as pole carrier 26.
• the mechanical connection between pole carrier 26, ring 24 and pole wheel half 22 is in each case provided by a solder joint between each first claw pole 28 of pole wheel half 22 and ring 24 and between every second claw pole 29 of pole carrier 26 and ring 24.
• the rotor 20 is surrounded concentrically by the stator 30.
• FIG. 1 shows a first embodiment of a claw pole generator according to the invention.
• the rotor 20 includes the rotor half 22, which is connected to a rotor shaft 32 in a rotationally fixed manner.
• the pole wheel half 22 in turn is also connected to the pole carrier 26 in a rotationally fixed manner by a holding means 34.
• the first claw poles 28 alternate with the second claw poles 29 on the circumference of the rotor 20 with equal spacing, with claw pole spaces 36 being located between the second claw poles 29 and the first claw poles 28.
• the holding means 34 is at least partially arranged in the claw pole spaces 36.
• the first claw poles 28 merge with claw pole roots 38 into a circuit board 39 of the pole wheel half 22.
• the first claw poles 28 and the second claw poles 29 each have approximately radial claw pole flanks 40 on the side.
• the holding means 34 is connected to the claw pole flanks 40 of the second claw poles 29 as well as to the claw pole flanks 40 of the first claw poles 28 both with the pole wheel half 22 and with the pole carrier 26 by means of a material connection.
• a suitable arrangement of the holding means 34 is provided in that the surface 42 extends essentially on the circumference. The smoothest possible surface of the rotor 20 is obtained if that
• Holding means 34 with its radially outwardly directed surface 42 forms a common cylindrical surface with the radially outwardly directed surfaces of the claw poles 28, as is also shown in FIG. 1.
• the holding means 34 comprises a plurality of individual holding elements 44, which are each arranged individually in the individual claw pole spaces 36 between a first claw pole 28 and a second claw pole 29.
• the position of the holding means 34 can be seen in FIG. 2, in which it is at the greatest possible distance from the rotor axis.
• the holding means 34 abuts the claw pole flank 40 of the first claw pole 28 and the second claw pole 29 with its lateral surfaces.
• the mechanical connection between the holding means 34 and the first and second claw poles 28 and 29 takes place in this butt joint.
• FIG. 3 shows a second exemplary embodiment of the rotor 20 with the holding means 34. This second
• the exemplary embodiment differs from the first in that adjacent holding elements 44 are connected to one another in the region of a free first claw pole end 46 and a free second claw pole end 47 by tabs 48.
• tabs 48 can be seen more clearly in FIG. 4, in which the tabs are angled to the rotor shaft 32.
• FIG. 5 shows a variant of this angled tab 48, the tab 48 located on the side of the rotor half 22 being flush with an axial outside 50 of the rotor half 22.
• the one-piece holding means 34 is shown in perspective, as is provided in the second embodiment.
• the holding means 34 here consists of one piece, the tabs 48 connecting the holding elements 44 in one piece.
• This one-piece holding means 34 has an essentially cylindrical jacket-shaped structure which has alternately open recesses for the first claw poles 28 and the second claw poles 29 on the pole carrier and pole wheel sides.
• FIG. 7 shows a third exemplary embodiment of the holding means 34 in a partial view of the rotor. This third exemplary embodiment is based on the exemplary embodiment shown in FIG. 6. As can be seen from Figure 8, the first and second go from
• Claw poles 28 and 29 adjacent ends of the holding elements 44 extend radially inwardly directed legs 54. These limbs 54 serve to stiffen the holding means 34, as a result of which the bending of the first and second claw poles 28 and 29 is further reduced while the centrifugal load remains the same.
• a further increase in stability or rigidity results from the fact that two opposing legs 54 are connected in a claw pole gap 36 in the region of a first and a second free claw pole end 46 and 47 by a web 56 each are, Figure 9. In Figure 10, the relevant cross-sectional view is shown.
• FIG. 11 shows a fourth embodiment of the holding means 34, in which, compared to the third embodiment according to FIG. 6, the legs 54 are connected at their radially inward ends by a so-called profile closing element 60, so that a closed hollow profile 61 results. See also FIG. 12.
• This fourth exemplary embodiment also has the tabs 48 already known from the second exemplary embodiment, which connect the individual holding elements 44.
• the claw poles 28 and 29 can also have claw pole flanks 40 'or 40 ", which are not directed purely radially inwards, but also have a tangential component in the alignment.
• claw pole flanks 40 are also possible, which are only partially directed radially inwards, FIG. 2.
• FIG. 14 is a partial side view of the rotor 20 from FIG
• the sides of the pole wheel half 22 are shown in the form of the fourth exemplary embodiment with the holding means 34.
• the hollow profile 61 which extends between a first and a second claw pole 28 and 29, is open on the side of the pole wheel half 22.
• the holding means 34 has a hollow profile 61 which is open to the rotor half 22, the tab 48 accordingly also has two openings results in a weakening of the material of the flap 48.
• the flap 48 has an angled end region 62 at its radially inner end, which extends between two adjacent claw pole roots 38.
• a further improvement results from that the angle of this flap 48 between two hollow profile openings is stiffened by an end region web 66, see also FIG. 11.
• the flap 48 between two claw pole roots 38 is integrally connected to the pole wheel half 22 connected, for example by a weld.
• Another possibility of stiffening the holding means 34 is to connect two adjacent legs 54 of two claw pole spaces 36 by a pole end web 68 below the claw pole ends, see also FIG. 11.
• Permanent magnets 70 are generally provided to increase the performance of a claw pole generator. This
• Permanent magnets 70 are inserted in the spaces between a first and a second claw pole 28 and 29. When the rotor is magnetically excited, the polarity of the first claw poles 28 is opposite to the polarity of the second claw poles 29.
• the permanent magnets 70 are oriented in such a way that they counteract a magnetic claw pole field between two opposite-pole claw poles 28 and 29 excited by an excitation coil 72 and thus reduce the leakage flux.
• such permanent magnets 70 can be fastened, for example by gluing, to the underside of the holding element 44, see FIGS. 15 and 16. If the two legs 54 form an undercut, for example, FIG.
• the permanent magnets 70 can also be introduced by that the hold of the permanent magnet is achieved by positive locking with the two legs 54.
• the permanent magnets 70 can be introduced into the hollow profiles 61 which are open on one side, FIG. 14. A fixation of the permanent magnets 70 in the hollow profile 61 is then, for example, by means of an impregnating resin which is in the Hollow profile 61 is introduced between the hollow profile 61 and permanent magnet 70. So that the function of the claw pole generator is not impaired by the holding means 34, the holding means 34 must consist of a magnetically inactive material. In particular for the third and fourth exemplary embodiments, it is advisable due to the relatively complicated shape that the holding means 34 is produced in one piece by precision casting an austenitic material.
• the cohesion between the holding means 34, the magnet wheel half 22 and the pole carrier 26 is best given by the fact that these three components are joined by means of welding, soldering or gluing points. It is envisaged that the MIG, laser or TIG welding process is used to produce the welds.
• the four exemplary embodiments described so far relate to rotors 20 with a guide piece or pole carrier 26, in which the pole carrier 26 is fastened to the pole wheel half 22 via the holding means 34.
• the holding means 34 in its previously described embodiment is also suitable for claw-pole-type rotors 20 which consist of a first pole wheel half 22 and a pole carrier 26, the pole carrier 26 also being designed as a pole wheel half which is similar to the pole wheel half 22. While in the master piece construction a general holding function for the
• pole carrier 26 is implied in the guide piece construction, this is not the case in the construction with two pole wheel halves 22.
• the fastening means 34 increases the resistance of the claw poles 28 against bending open due to its attachment on the one hand to the claw poles 28 or the first claws 36 of the one pole wheel half 22 and on the other hand to the claw poles 28 or the first claws 36 of the other second pole wheel half 22, as is already the case with the lead piece construction is the case. Furthermore, vibrations of the claw poles in the direction tangential to the rotor axis are practically prevented.
• a rotor 20 with a pole carrier 26 in a guide piece construction is to be distinguished between the first claw poles 28 and the second claw poles 29 to such an extent that the first claw poles 28 have claw pole roots 38, so that a disk-shaped region of a pole wheel half 22 has recesses between the first claw poles 28.
• the flap-side fastening of the holding means 34 as shown in FIG. 14, or the position of the flap 48, see also FIG. 4 and FIG. 5, in these recesses.

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

Applications Claiming Priority (3)

Publications (1)

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ID=7919239

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• 1999
  • 1999-08-21 DE DE1999139808 patent/DE19939808A1/de not_active Withdrawn
• 2000
  • 2000-07-29 JP JP2001518912A patent/JP2003508003A/ja active Pending
  • 2000-07-29 AU AU74019/00A patent/AU7401900A/en not_active Abandoned
  • 2000-07-29 EP EP00962171A patent/EP1131877A1/de not_active Withdrawn
  • 2000-07-29 WO PCT/DE2000/002510 patent/WO2001015301A1/de not_active Application Discontinuation
  • 2000-07-29 BR BR0007028-9A patent/BR0007028A/pt not_active IP Right Cessation

Non-Patent Citations (1)

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