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
  • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
  • H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
  • H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
  • H02K15/021—Magnetic cores
  • H02K15/026—Wound cores
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
  • H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
  • H02K15/028—Fastening stator or rotor bodies to casings, supports, shafts or hubs

Definitions

• the present invention relates to rotating electrical machines and more particularly to rotors, in particular alternators.
• Magnetic exciter armature circuits are conventionally constituted by a stack of sheets.
• the armature plates are very often cut in the central part of the laminations of the inductor, or even in a specific strip of metal if the inductor is cut apart or made of cast iron.
• the consumption of magnetic sheet to achieve the armature is then equal to either a cylinder or a parallelepiped of equivalent dimensions.
• the difference between the consumed magnetic sheet and the material actually necessary for the conduction of the magnetic flux is very important. It is not uncommon for the raw material used to represent twice the material useful for the passage of the flux.
• the invention aims to further improve the realization of the magnetic circuit of the rotor.
• the object of the invention is, according to one of its aspects, a rotary electric machine rotor, in particular for a coiled or flux-commutated rotor machine, comprising:
• the invention reduces, for example by about a third, the amount of material consumed to produce an exciter armature.
• the fact of dissociating the cutting of the plates used to make the armature from that of the plates used to make the inductor offers the possibility of using different grades of materials, optimizing the choice of the grade of material to the real need of each of the components and thus reducing the overall cost.
• the support may be of stamped sheet metal, and consequently, its longitudinal size is less than a conventional sheet stack. It is therefore possible to reduce the overall length of the machine by taking advantage of this available space to insert one or more functions such as balancing, diode bridge or bearing bearing.
• Sectors may belong to sector bands that each occupy less than one complete revolution on the rotor.
• the sectors may belong to one or more sector bands wound on it (s) themselves on one or more complete revolution.
• the angular extent of each sector band can be between 60 and 360 °, being preferably 120 °.
• Each sector may have two half teeth or only two half teeth.
• each sector comprises at least one tooth
• the rotor preferably has sectors on the two opposite faces of the support.
• the sector strips are advantageously angularly offset from one face of the support to the other, which improves the mechanical cohesion of the rotor.
• the offset is for example 60 °.
• the sectors preferably comprise several superimposed magnetic sheets, for example snapped onto each other.
• the sectors can be connected to one another at the level of the teeth. At least two adjacent sectors may be interconnected by a material bridge integrally with the sheet metal sectors.
• the rotor may comprise a balance weight, fixed on the support.
• a diode bridge serving to feed the main inductor of the alternator, or an electronic circuit regulating the voltage across the main inductor.
• the support may have a general discoid shape.
• the support can be formed by stamping a sheet.
• the support may comprise stiffening ribs each extending in the radial direction.
• the support may have on the periphery notches which are superimposed with notches sectors.
• the rotor may comprise a recess, in particular in the form of a drop of water, adjacent to the bridge of material connecting two adjacent sectors.
• the number of rotor poles is preferably greater than or equal to 4.
• the sectors are preferably made in a sheet having a carbon mass content of less than or equal to 0.07%.
• Sector bands may carry windings.
• the subject of the invention is also a method for manufacturing a rotor as defined above, comprising the steps of:
• the invention also relates to a rotating electrical machine comprising a rotor according to the invention.
• the stator may advantageously comprise laminations defining the magnetic circuit of the stator, cut in a different material, for example with a higher carbon content, than that serving to produce the sectors of the rotor.
• the machine may in particular be an alternator and the rotor according to the invention constitute the rotor of the exciter.
• FIG. 1 schematically and partially shows in perspective an example of a rotor produced in accordance with the invention
• FIG. 2 represents the magnetic circuit of the rotor, in place on the support
• FIG. 4 represents a band of sectors before bending
• FIG. 5 represents the sector band after bending
• FIG. 6 illustrates the mounting of the sector strips on the support
• FIG. 7 illustrates the possibility of fixing a balance weight on the support
• FIGS. 8 and 9 show a detail of a sheet used for producing a strip of sectors
• FIG. 10 illustrates the possibility of fixing an electronic component directly on the support, in order to dissipate the heat released by this component.
• the rotor 1 shown in the figures is an exciter rotor, but the invention is not limited to such a rotor and can be applied to the rotors of various rotating electrical machines, whether or not wound, flow for example.
• the rotor 1 comprises, as can be seen in particular in FIG. 2, a support 3 also called a rim, on which sector strips 5 are fixed, one of which is shown in isolation in FIG.
• the rim 3 is for example stamped sheet.
• Each band 5 is for example formed, as illustrated, of a succession of sectors 7, two adjacent sectors 7 may have, on their sides facing, two reliefs 14 and 15 intended to cooperate when the band is bent, such as for example a tooth and a notch of complementary shapes.
• Some sectors 7 may further have, as illustrated, a hole 17 for the passage of a fastener 18 on the rim 3, such as for example a rivet.
• the sector strip 5 may comprise in particular, as illustrated, two end sectors 7 each provided with a hole 17 and two middle sectors, also provided with a hole 17.
• the reliefs 14 and 15, as well as the holes 17, are preferably formed at a small distance from the radially outer edge of the sectors 7.
• Each sector 7 comprises two half-teeth 9, which delimit between them a notch 11, and are each provided with a pole shoe 10.
• the notch 11 is thus open on the outside.
• This material bridge 8 connects the sectors 7 on the side of the teeth 9, preferably without protrude on the cylindrical surface opposite the air gap on the finished rotor.
• the material bridge 8 is delimited, on the radially inner side, by a rounded edge 22, connected to initially straight and parallel edges 21.
• the latter are connected to straight edges 23 which initially diverge.
• the presence of the edges 21 makes it possible not to weaken the cutting tool of the sheets.
• the sectors 7 are brought together in order to give the band 5 its definitive arcuate shape, visible in FIG. 5, the edges 21 come closer and form with the edge 22 a water droplet profile, while the edges 23 become joined. as shown in FIG. 9.
• the recesses 29 delimited by the edges 21 and 22 are not apparent in FIG. 5.
• the presence of the recess 29 in the droplet profile is not a problem because it is located in a region where the magnetic flux is low during operation of the machine.
• the rim 3 comprises at its periphery a succession of notches 30 which are superimposed on the notches 11 when the sectors 7 are in place.
• the notches 30 are formed between teeth 33 provided, for example, as illustrated, with polar expansions which are superimposed on the openings 10.
• the sectors 7 can receive windings 66 when fixed on the rim 3.
• the strips 5 of sectors 7 are advantageously arranged on the rim 3 being circumferentially offset from one face to the other, as illustrated in FIG. 6.
• ⁇ is 120 ° and the bands 5 of sectors 7 are shifted 60 ° from one face to the other. This offset makes it possible to make the hole 17 of an end sector of a sector strip situated on one side of the rim 3 coincide with that of a median sector of the strip disposed on the opposite side of the rim 3.
• the rim 3 can be made, as illustrated, with stiffening ribs 40 which extend for example radially from a hub 48, cylindrical of revolution about the axis of the rotor, for mounting on a shaft not shown.
• the rim 3 is advantageously made of stamped sheet.
• Bores 49 may be made on the rim 3 for mounting thereon various components, for example a balance weight 50, as shown in Figure 7.
• Each strip 5 of sectors 7 may be formed by a stack of superposed and snapped-up sheets.
• the cutting of the sheets can be done in strips by saving the material.
• the strip 5 has for example a substantially straight shape, illustrated in FIG. 4.
• the strip 5 is given its final shape by bending it at the level of the material bridges 8.
• the notches 11 may be wound after securing the sectors 7 on the rim 3.
• the rim 3 can be used as a heat sink, if necessary, by fixing on the component or components to be cooled, as illustrated in FIG. 10, where a diode 60 is seen fixed on a receiving plate formed on the rim 3. for example at a stiffening rib 40.
• a wire pass or a clearance for the routing of electric cables is integrated in the rim 3.
• the magnetic circuit of the rotor can be realized with lower carbon sheets than those of the stator, because the exciter armature is less magnetically stressed.
• the number of poles of the rotor is greater than or equal to 4, the invention not being limited to the polarity illustrated.
• the rim 3 can be made of a magnetic material or not.
• the rim 3 is made without the notches 30 or without the pole shoes 33, not extending for example to the periphery of the magnetic circuit of the rotor.
• a strip of sectors the length of which is such that it extends over a complete revolution or more of a complete revolution around the axis of rotation.
• the invention is not limited to the illustrated example.
• the rotor is not wound and used in a flux switching machine.

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

Priority Applications (3)

Applications Claiming Priority (2)

Publications (2)

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ID=47358248

Family Applications (1)

Country Status (6)

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Citations (2)

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• 2011
  • 2011-11-03 FR FR1159964A patent/FR2982438B1/fr active Active
• 2012
  • 2012-05-31 CN CN201210177485.2A patent/CN103095009B/zh not_active Expired - Fee Related
  • 2012-05-31 CN CN2012202548483U patent/CN202840731U/zh not_active Expired - Fee Related
  • 2012-10-31 EP EP12801636.7A patent/EP2774250B1/fr active Active
  • 2012-10-31 IN IN919KON2014 patent/IN2014KN00919A/en unknown
  • 2012-10-31 US US14/356,262 patent/US9425661B2/en not_active Expired - Fee Related
  • 2012-10-31 WO PCT/IB2012/056053 patent/WO2013064998A2/fr not_active Ceased

Patent Citations (2)

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