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
  • H02K1/27—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
  • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
  • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
  • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
• • 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
  • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
  • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
  • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
  • H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
  • H02K2201/06—Magnetic cores, or permanent magnets characterised by their skew

Definitions

• the present invention relates to a rotating electric machine rotor and a rotating electrical machine comprising such a rotor.
• Patent EP 0 641 059 discloses a rotary electric machine rotor comprising first packs of floating sheets and second packets of sheets ensuring the mechanical cohesion of the rotor. Stems are introduced through the sheets so as to maintain the whole. The number of sheets of the second packets is relatively small compared to the number of sheets of the first packs, so that the rods are not maintained by the sheets of the second packets over a large part of their length. Such a machine is not adapted to rotate at high speeds.
• the object of the invention is to provide a rotating electric machine rotor which is of simple manufacture and which has improved mechanical strength, especially at high rotational speeds of the rotor.
• a rotating electric machine rotor comprising:
• the pole parts connected to the hub of a sheet metal, or a bundle of sheets respectively, are superimposed on the recesses of a consecutive sheet, respectively of a consecutive bundle of sheets, and
• each sheet respectively each sheet bundle, comprises non-floating polar parts through which the holding rods are engaged, so that the number of bearing points of the rods on the non-floating polar parts is considerably increased with respect to the machine according to the patent EP 0 641 059, in which only certain bundles of sheets provide support points for the rods.
• the cohesion of the machine is improved, and the resistance to centrifugal forces is better.
• the rods can be held regularly and securely by the non-floating polar parts, these non-floating polar parts serving as embedding and thus promoting the maintenance of the rods floating polar parts.
• Each polar part, floating or not, can be formed by a single sheet.
• the rotor comprises, in the axial direction, one-piece plates comprising a plurality of non-floating polar parts formed with the hub, which are alternately angularly offset, floating polar parts being arranged in the spaces left vacant between the non-floating polar parts. of these sheets.
• the sheets are grouped in packets.
• a non-floating polar portion has a thickness corresponding to the number of superposed sheets.
• the floating polar parts are also advantageously formed by packets of stacked sheets.
• the rotor may comprise N poles, for example four, six, eight, ten, twelve, fourteen or sixteen poles. Two consecutive sheets, defining the non-floating polar portions, respectively two consecutive bundles of sheets, can be angularly offset by an angle equal to 360 ° / N.
• Each aforementioned recess can receive a single floating polar part.
• the magnets can be arranged radially between the floating and non-floating polar parts.
• the rotor obtained can be a flux concentration rotor.
• the magnets may have a trapezoidal section, taken perpendicular to the axis of rotation, having convergent radial edges as one moves away from the axis of the rotor.
• a trapezoidal section allows the magnets to be held on the rotor by a wedge effect between the floating and non-floating polar parts.
• Each magnet can be made in one piece or, alternatively, comprise several pieces of magnets disposed successively axially and / or radially.
• the magnets may have a rectangular section.
• Floating and non-floating polar portions may have retention lugs configured to hold the magnets in place against centrifugal force induced by rotation of the rotor.
• Each recess formed between two non-floating polar parts may contain at least partially, in the circumferential direction, a first permanent magnet, a floating polar part and a second permanent magnet, the magnets having poles of the same polarity facing the floating part.
• the dimensions of the recesses, floating polar parts and magnets may be such that the magnets are received without lateral play in said recesses, once the polar parts mounted in the recesses and before introduction of the retaining rods.
• the magnets are received with a lateral clearance in the recesses, once the floating polar parts mounted and before introduction of the retaining rods, this clearance being for example greater than or equal to 0.2 mm.
• Each pack of sheets may have between 10 and 500, in particular between 50 and
• Each sheet may comprise radial arms connecting the hub to the non-floating polar parts, the latter being regularly arranged around the hub.
• the floating and non-floating polar parts may be of substantially the same size.
• Openings may be provided between the floating polar parts and the hub. These openings are preferably of greater angular extent than the extent of a pole. The openings may be delimited circumferentially by the arms connecting the non-floating polar parts to the hub. The openings may have rounded end edges, for example semicircular, connected by concentric arcs centered on the axis of rotation.
• the angular spacing between the circumferential ends of an aperture is preferably greater than the angular spacing between the radially inner ends of two adjacent magnets.
• the interest of the openings is to facilitate the ventilation of the rotor and reduce losses by looping the magnetic flux of a magnet by the hub.
• the shaft on which the hub is engaged can be magnetic, which makes it less expensive than a non-magnetic shaft.
• the staggering of the sheets, respectively the bundles of sheets, can leave axial ventilation channels, formed by the superposition of the openings.
• the floating and non-floating polar parts may each comprise a hole for passing the rods of substantially the same shape, so that each holding rod is alternately received in a hole of a floating polar part and in a hole of a part non-floating polar.
• the holes of the floating polar parts and non-floating polar parts may be slightly angularly offset with respect to the same reference direction before the introduction of the holding rods. This introduction causes the alignment of the holes and the appearance of a torque of the permanent magnets between the floating and non-floating polar parts.
• each non-floating polar portion is, for example, arranged such that the radius passing through the center of said hole and the radius dividing the non-floating polar portion into two halves define a first angle and each hole in a floating polar portion. may be arranged such that the radius passing through the center of said hole and the radius dividing the floating polar portion into two halves define a second angle, different from the first angle. The difference between the first and second angles may be sufficient so that, when the holding rods are introduced into the holes, the side clearances are canceled by angular sliding of the consecutive sheets, respectively consecutive packets of sheets.
• the dispersion of the games can be compensated by the elasticity of the sheets and holding rods.
• the invention further relates, in another of its aspects, to a rotating electrical machine, comprising:
• the rotor is preferably configured for use in an internal rotor rotating electrical machine but alternatively may be used in an external rotor rotating electrical machine.
• the machine is preferably a radial induction flux machine. Alternatively, it may be an axial induction flow machine.
• the machine may be a motor or a generator, being for example a polyphase machine, in particular three-phase.
• the machine is for example configured to operate at a rated power of between 10 and 2000 kW.
• FIG. 1 is a semi-exploded view of a rotor according to a first example of implementation of the invention
• FIGS. 2 and 3 are cross-sections of machines according to other examples of implementation of the invention.
• Figure 4 shows schematically a variant of permanent magnet.
• FIG. 1 shows a rotor 2 of a rotating electrical machine 1 according to an embodiment of the invention.
• the rotor 2 of this machine can rotate inside a stator 3 as shown in FIGS. 2 or 3, comprising a magnetic carcass 4 having a plurality of teeth 5.
• the stator 3 is preferably wound on teeth, but could alternatively be distributed winding.
• the stator 3 is preferably three-phase.
• the machine 1 is shown as being an internal rotor machine, it could, in a variant not shown, be external rotor.
• the rotor 2 comprises a plurality of packets of magnetic sheets 9 stacked along the axis of rotation X of the rotor 2, between two end flanges 10 made of material non-magnetic.
• these cheeks 10 may be replaced by crosses, including as many branches as non-floating polar parts, which can then be magnetic.
• Stems 26 connect the cheeks 10 while maintaining in axial compression the stack.
• each bundle of laminations 9 of the rotor comprises a hub 11 providing a passage for the rotor shaft, not shown, and a plurality of non-floating polar portions 13 projecting radially outwardly from the hub.
• the rotor comprises eight poles and each packet of plates 9 has four polar parts 13 uniformly distributed around the periphery of the hub 11.
• Each pole portion 13 is connected to the hub 1 by an arm 14 less wide than the corresponding pole portion 13.
• each arm 14 is of constant width and has straight edges 20.
• each arm 14 has concave, semicircular edges 20.
• each non-floating polar portion 13 may have opposing edges 12 diverging as one moves away from the X axis of the rotor.
• Two consecutive polar portions 13 of the same bundle of sheets 9 define between them a recess 16 which extends in the example described from the hub 11 to the gap E of the machine.
• each recess 16 can receive a floating polar part 17 framed by two magnets 18.
• the magnets 18 are arranged radially, circumferentially oriented magnetization.
• the rotors of the examples of FIGS. 1 to 3 comprise, for example, as illustrated, four North and four South poles.
• the magnets have a trapezoidal section, that is to say that their width, measured between two radial edges 19, decreases when moving away from the X axis of the rotor.
• the magnets 18 shown in FIG. 2 are made in one piece but, in the variant shown in FIG. 4, several pieces of magnets 18a, 18b and 18c are successively arranged radially, as one moves away from the X axis of the rotor.
• the magnets 18 are of rectangular section and retaining nozzles 22 are provided on the opposite edges of the pole portions 17 and 13, so as to maintain the magnets 18 in place against the centrifugal force.
• the radially outer edge of the pole portions may be of radius of curvature less than the half-diameter of the rotor, so as to reduce the torque ripples.
• the pole portions 13 and 17 may extend an angular distance about the substantially equal axis X.
• Each pole portion 13, respectively 17, may comprise as illustrated a through hole 24, respectively 25, which is for example of circular shape. These holes 24 and 25 are able to receive holding rods 26, visible in FIG.
• the holes 24 and 25 may be formed in the pole portions 13 and 17 so that they are exactly superimposed when all the rotor plates are assembled.
• each hole 24 may be arranged in such a way that the angle formed between the radius passing through the center of the hole 24 and the median radius dividing the corresponding polar portion 13 into two halves is different from the angle ⁇ defined between the radius passing through the center of the hole 25 and the median radius dividing the corresponding polar portion 17 into two halves.
• the angle may be zero, unlike the angle ⁇ , or vice versa.
• the angles a and ⁇ are both non-zero and have different values.
• Each sheet package comprises for example between 50 and 150 sheets. Plates belonging to the same bundle of plates 9 have the same orientation, that is to say that the polar parts 13 of all these sheets are superimposed and the recesses 16 of these sheets are also superimposed. Two consecutive bundles of plates 9 are angularly offset so that the pole portions 13 of a bundle of sheets are superimposed on the recesses 16 of the consecutive sheet metal bundle and the recesses 16 of said bundle of sheets are superimposed on the recesses 16 of the bundle of plates. consecutive sheets. Thus, along a pole, there is alternating polar parts 13 and 17.
• a sheet package is replaced by a single sheet, so that two consecutive sheets are angularly offset.
• a lateral clearance between the edges 19 of each permanent magnet 18 and the radial edges facing the pole portions 13 and 17 may remain when the magnets 18 and the floating polar parts 17 are in place in the recesses 16.
• the holes 24 and 25 may not be aligned from one pack of sheets to another and the introduction along the X axis of the rods 26 may allow to align the holes 24 and 25.
• the introduction of the rods 26 causes an angular sliding of the plate packets, relative to each other, which causes the cancellation of side clearances between each permanent magnet 18 and the radial edges of the pole portions 13 and 17.
• Each permanent magnet 18 can then come into contact with each other. with these radial edges, so as to induce clamping of the magnets 18 between these radial edges.
• the sheets and / or the rods 26 are for example arranged to be sufficiently elastic to compensate for the dispersion of the lateral games.
• the invention is not limited to the examples which have just been described.
• the number of poles of the machine may be different.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=51168028

Family Applications (1)

Country Status (4)

Families Citing this family (6)

Family Cites Families (9)

• 2014
  • 2014-02-27 FR FR1451592A patent/FR3018009B1/fr not_active Expired - Fee Related
• 2015
  • 2015-02-19 EP EP15711293.9A patent/EP3111537A1/de not_active Withdrawn
  • 2015-02-19 CN CN201580011173.6A patent/CN106068599A/zh active Pending
  • 2015-02-19 WO PCT/IB2015/051271 patent/WO2015128782A1/fr active Application Filing

Non-Patent Citations (2)

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