EP3130060A2 - Rotor for a rotary electric machine - Google Patents
Rotor for a rotary electric machineInfo
- Publication number
- EP3130060A2 EP3130060A2 EP15724764.4A EP15724764A EP3130060A2 EP 3130060 A2 EP3130060 A2 EP 3130060A2 EP 15724764 A EP15724764 A EP 15724764A EP 3130060 A2 EP3130060 A2 EP 3130060A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- pole
- permanent magnets
- row
- rotor according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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- 238000004804 winding Methods 0.000 claims description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims description 10
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- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 5
- 239000000696 magnetic material Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052770 Uranium Inorganic materials 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
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- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
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
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K21/145—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having an annular armature coil
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
Definitions
- the present invention relates to rotating electrical machines, especially synchronous machines, and more particularly the rotors of such machines.
- the invention is concerned with rotors with permanent magnets.
- Rotating electrical machines comprise a rotor mass in which are housed permanent magnets, which are engaged in housing oriented most often radially.
- Rotating electrical machines are also known comprising non-radial permanent magnets, arranged for example in V or U.
- the induction obtained in the gap is greater than the induction in the magnets.
- the induction obtained in the gap can depend strongly on the circumferential position with respect to the axis of rotation.
- the rotors of such rotating electrical machines do not make it possible to provide machines of relatively low polarity, for example less than eight or even six, with efficient use of magnets, especially ferrite magnets and / or low density magnets. energy.
- the invention aims to meet all or part of this need and it succeeds, according to one of its aspects, thanks to a rotor of rotating electrical machine, comprising permanent magnets defining magnetic poles of the rotor, a first pole of which and a second pole adjacent to the first pole, the first and second poles being of different polarities, permanent magnets specific to the first pole contributing solely to the polarity of the first pole and at least one shared permanent magnet contributing in part to the polarity of the first pole and partly to the polarity of the second pole.
- the rotor comprises at least one permanent magnet shared between two consecutive poles.
- shared permanent magnet is meant a permanent magnet common to the definition of two consecutive poles of the rotor. This magnet can thus be arranged in an interpolar axis.
- At least one permanent magnet defining said first pole also defines the second pole of the rotor adjacent to the first pole. The boundary between the two consecutive poles passes through at least one permanent magnet.
- the permanent magnets may be arranged in rows, the first pole of the rotor being defined by at least a first row of clean permanent magnets and by at least a second row of shared permanent magnets, which second row also defines at least in part the second pole of the rotor adjacent to the first pole.
- the second row of permanent magnets simultaneously defines each of the two consecutive poles of the rotor between which it is located.
- the shared permanent magnet belongs to the second row of permanent magnets.
- row is meant a succession of at least two permanent magnets.
- a row is in no way necessarily linear. On the contrary, a row may be U-shaped or V-shaped, as will be seen later.
- each pole is defined by a number of non-integer rows, being equal to the number of first rows plus one half.
- the second row defining said pole counts for half, given the use of the magnets of the second row to define simultaneously two consecutive poles of the rotor.
- the number of rows per pole may be higher, so that the total amount of permanent magnets may be larger, equivalent space.
- the cumulative height of the magnets of the second row common to two consecutive poles is higher, which may allow to obtain an improved power factor, since a larger fraction of the load voltage is produced by the flux of the magnets.
- the saliency ratio can be increased, since the magnets shared between two consecutive poles can form a barrier to the flow of the direct magnetic flux without affecting the magnetic flux in quadrature.
- the electromotive force may be greater and have fewer harmonics, since the zero crossing of the induction in the interpolar axis is angularly smaller.
- the rotor mass Thanks to the arrangement of the magnets in the rotor mass, sufficient induction levels in the air gap are obtained, even with a relatively low rotor polarity, for example less than 6, while not necessarily using strong magnets. energy density, such as magnets made of rare earths, but on the contrary low energy density, for example made of ferrite. The cost of the rotor can thus be reduced. In addition, the polarity of the rotor can be reduced if the application requires it. In fact, the rotor according to the invention makes it possible to increase the level of induction in the gap without increasing the polarity and by using magnets with a low energy density.
- the permanent magnets are preferably rectangular in cross section. Alternatively, the width of a magnet taken in cross section perpendicular to the axis of rotation may taper when moving towards the air gap.
- the permanent magnets may be generally trapezoidal in cross section. In another variant, the magnets may be in curvilinear cross section, for example of ring-shaped shape.
- the permanent magnets may be between 4 and 20 mm wide. At least one magnet of a first row, or even at least half of the magnets of a first row, or even all the magnets of a first row, may be of a width greater than 4 mm, better still greater than 8 mm, even more than 12 mm.
- the magnet or magnets of a second row of permanent magnets may be of the same width as the magnets of a first row, or alternatively of a different width, in particular of an upper width.
- at least one shared permanent magnet may be wider in cross section than a clean permanent magnet, being for example twice as large as a clean permanent magnet.
- Such a configuration can make it possible to minimize, or even better suppress, any circulation of the flux between two adjacent poles, in particular the direct magnetic flux, without affecting the magnetic flux in quadrature, and thus to reduce the harmonic rates.
- the yield can be improved.
- the number of material bridges, including radial bridges can be reduced, so that the electromagnetic torque is improved. Magnetic leaks in bridges tend to naturally reduce the useful magnetic flux.
- the first pole may comprise a single first row, or each of the rotor poles may comprise a single first row.
- said first pole may comprise at least two first rows, or each of the rotor poles may comprise at least two first rows, including two or even three or more.
- the first pole has two first rows.
- Each of the rotor poles may comprise two first rows.
- the rotor may comprise a number of poles between 2 and 12, better still between 4 and 10.
- the number of poles of the rotor may be less than or equal to 8, or even less than or equal to 6, being for example equal to 4 or 6.
- Permanent magnets can be made of ferrites or with rare earths or with any other type of magnetic material.
- the permanent magnets can in particular be made at least partially of ferrite. They may for example not contain rare earths, or at least contain less than 50% rare earth en masse.
- the arrangement of the magnets makes it possible to concentrate the flow of the magnets and to obtain interesting performances with ferrite magnets.
- the permanent magnets are arranged in U oriented towards the gap.
- a row of permanent magnets thus comprises two lateral branches and a central branch.
- the U's of the same pole are arranged in a concentric manner, in other words the U's of the same pole are nested inside each other.
- a U can have a flared shape towards the gap.
- the lateral branches of the U can be nonparallel to each other.
- the permanent magnets are preferably arranged in U when each of the poles of the rotor comprises at least two first rows.
- the permanent magnets are arranged in V oriented towards the air gap.
- a row of permanent magnets thus has two lateral branches and is devoid of central branch.
- the V's of the same pole are arranged in a concentric manner, in other words the V's of the same pole are nested inside one another.
- the permanent magnets are preferably arranged in V when each of the poles of the rotor comprises a single first row.
- U or V are oriented towards the gap.
- U or V facing the gap means that the U or V is open towards the air gap.
- Each side branch of a U or a V can be formed by a single permanent magnet.
- each lateral branch of a U or of a V is formed by more than one permanent magnet, in particular by two magnets forming, for example, each branch of the U or V. Such a segmentation of the magnets may make it possible to improve circulating the flow in the rotor mass and / or introducing bridges to stiffen it.
- a branch of a U or a V may be formed of several magnets, for example two. Two magnets of a branch of U or V can be aligned. In a variant, the magnets forming a branch of a U or a V may each extend along an axis, the two axes forming an angle ⁇ between them. This angle may be between 0 ° and 45 °.
- the rotor may comprise a rotor mass receiving the permanent magnets, the rotor mass may comprise housings in which are disposed the permanent magnets.
- a housing may be in cross section of generally rectangular shape. Alternatively or additionally, at least one housing may extend radially over a length greater than the radial length of the corresponding magnet, in cross section.
- the shape of the housing in cross-section can be chosen to optimize the waveform of induction in the air gap. For example, at least one end of the housing in cross section perpendicular to the axis of rotation may be rectangular, triangular or curved, better both ends are rectangular, triangular or curved.
- the party (s) of the housing without magnet at one of its ends or ends may be in the form of a right-angled or rounded triangle.
- the hypotenuses of the two right-angled triangles or the rounding located closest to the air gap may be arranged opposite each other. Such a shape makes it possible to better guide the magnetic flux towards the gap.
- the hypotenuses of the two right triangles or the rounded ones located closest to the axis of rotation can be arranged face to face.
- the rotor may comprise permanent magnets inserted in all or part of the dwellings, for example in at least half of the dwellings, or even in more than two thirds of the dwellings, better still in all the dwellings.
- At least one housing may be configured to receive a plurality of permanent magnets of one row, or all permanent magnets of a row.
- the rotor may be devoid of a bridge of radial material formed between two consecutive housings of a row, as explained below.
- the housings may be separated by material bridges, which may extend parallel to a radial axis of the corresponding pole or be inclined relative thereto.
- radial axis of the pole is meant an axis of the pole oriented radially, that is to say along a radius of the rotor. It can be an axis of symmetry for the pole. This radial axis can intersect the summit of the pole.
- the material bridges formed between the housings can extend obliquely generally along a longitudinal axis of the bridge which can form with radial axis of the corresponding pole of the rotor an angle of a non-zero value and greater than 5 °, better than 10 ° for example of the order of about 15 °.
- the angle may be less than 45 °, more preferably less than 30 °, or even less than 20 °.
- longitudinal axis of the bridge means the axis disposed centrally relative to the two short sides of the adjacent housing defining the bridge material. This axis is preferably rectiîigne.
- the rotor may be devoid of material bridge other than tangential.
- tangential bridge means a material bridge formed between a housing and the gap.
- the rotor is devoid of radial bridges as described above. This can significantly improve the electromagnetic performance.
- the housing of this pole can be arranged in a single first row.
- the concavity of the row can be oriented towards the top of the pole, that is towards the gap.
- the permanent magnets of this pole may be arranged in several first rows, each concavity which can be oriented towards the top of the pole, in particular in substantially concentric rows.
- concentric is meant that the middle axes of the rows of housing, taken in a plane perpendicular to the axis of rotation of the rotor, intersect at one point. This arrangement in several concentric rows makes it possible to improve the concentration of the flow without necessarily having to increase the size of the housings or the quantity of permanent magnets necessary to obtain an equivalent flux.
- the number of first rows per pole can in particular be one, two, three or four.
- the latter can be of decreasing length when moving towards the air gap, the longest being closer to the axis of rotation and the shorter one to the side. of the gap.
- the length of a row is the cumulative length of the dwellings in that row.
- At least two housings of two rows of the same pole can extend parallel to each other. All one-row dwellings may extend parallel to the corresponding dwellings of another row.
- a row may comprise a number of dwellings strictly greater than one, for example at least two dwellings, better three dwellings.
- a row may for example comprise a central housing and two lateral housing.
- At least one row may comprise an odd number of dwellings, for example at least three dwellings.
- Two rows of the same pole may have a different number of dwellings.
- at least one pole comprises a row of housings having a lower number of housings than those of another row of this pole, for example two against three for the other row.
- the row with the smallest number of housings is preferably the closest to the gap and furthest from the axis of rotation.
- the arrangement of the housings and / or material bridges in a row is preferably symmetrical with respect to the radial axis of the pole.
- the housing can be arranged in V or U, the U may have a flared shape towards the air gap.
- the housing constituting the lateral branches of the U may be non-parallel to each other.
- the inclination of the radial bridges can be opposite to that of the lateral housings, with respect to the radial axis of the pole.
- the central housing may be longer or shorter than that of a branch of the U.
- the branches of the U are shorter. that the central branch constituting the bottom of the U.
- the housings may each extend, when observed in section in a plane perpendicular to the axis of rotation of the rotor, along a longitudinal axis which may be rectilinear or curved, preferably being rectilinear.
- the housings can have a constant or variable width when moving along their longitudinal axis, in a plane perpendicular to the axis of rotation of the rotor.
- the short sides of a housing of a first row can be oriented towards the radial axis of the pole when one moves away from the axis of rotation, and converge for example substantially to the top of the pole.
- the housing may have, in cross section, that is to say perpendicular to the axis of rotation, a generally rectangular or trapezoidal shape, this list is not limiting.
- the short sides of a dwelling may be perpendicular to the long sides of the dwelling.
- the short sides of a housing can be inclined relative to the long sides of the housing.
- At least one dwelling may have two long sides, one of the long sides being smaller than the other.
- the shortest of the long sides may be located closer to the gap than the longest of the long sides.
- the short sides of a housing can be rectilinear or curved.
- the material bridges between two consecutive housings of a row may have a width, measured perpendicular to their longitudinal axis, of less than 8 mm and the bridges of material may have a width greater than 0.5 mm.
- the rotor may comprise a rotor mass receiving the permanent magnets and a shaft extending along an axis of rotation, on which the rotor mass is arranged.
- the shaft may be made of a magnetic material, which advantageously makes it possible to reduce the risk of saturation in the rotor mass and to improve the electromagnetic performances of the rotor.
- the shaft may comprise a magnetic sleeve in contact with the rotor mass, the sleeve being mounted on an axis, magnetic or not.
- the rotor may comprise a non-magnetic shaft on which the rotor mass is arranged.
- the shaft may for example be made at least partly in a material of the following list, which is not limiting: steel, stainless steel, titanium or any other non-magnetic material.
- the rotor mass may in one embodiment be disposed directly on the non-magnetic shaft, for example without intermediate rim.
- the rotor may comprise a rim surrounding the rotor shaft and coming to bear on the latter.
- the second row may extend at least from the air gap to a rotor shaft, in particular a non-magnetic shaft, the rotor being devoid of a magnetic part between one end of the row and the tree.
- the rotor is devoid of a radial or circumferential magnetic bridge extending between the rotor shaft and the second row.
- the second row has only two lateral branches and is devoid of a central branch.
- the rotor mass extends along the axis of rotation and is arranged around the shaft.
- the shaft may comprise torque transmission means for driving in rotation of the rotor mass.
- the rotor mass may be formed of a stack of layers of magnetic sheets.
- the stack of magnetic sheet layers may comprise a stack of magnetic sheets, each in one piece, each sheet forming a layer of the stack.
- a sheet may comprise a succession of sectors connected by tangential material bridges.
- each rotor plate is cut from a sheet of magnetic steel, for example steel 0.1 to 1.5 mm thick.
- the sheets can be coated with an electrical insulating varnish on their opposite faces before assembly within the stack. The insulation can still be obtained by a heat treatment of the sheets.
- the rotor mass may comprise a plurality of pole pieces assembled on the rotor shaft, which is in this case preferably non-magnetic.
- the assembly can be done by dovetails on a shaft of the machine.
- Each pole piece may comprise a stack of magnetic sheets.
- the distribution of the housings is advantageously regular and symmetrical, facilitating the cutting of the rotor sheet and the mechanical stability after cutting when the rotor mass consists of a superposition of rotor plates.
- the number of housings and magnets depends on the polarity of the rotor.
- the rotor mass may comprise any number of dwellings, for example between 4 and 96 dwellings, better still between 8 and 40 dwellings, or even between 16 and 32 dwellings.
- Magnets can be buried in the rotor mass. In other words, the magnets are covered by the layers of magnetic sheets at the gap. The surface of the rotor at the air gap can be entirely defined by the edge of the magnetic sheet layers and not by the magnets. The housing does not open then radially outward.
- the rotor mass may comprise one or more holes to lighten the rotor, to allow its balancing or for the assembly of the rotor plates constituting it. Holes may allow the passage of tie rods now integral with the sheets.
- the sheet layers can be snapped onto each other.
- the housings can be filled at least partially with a non-magnetic synthetic material. This material can lock in place the magnets in the housing and / or increase the cohesion of the sheet package.
- the rotor mass may comprise, where appropriate, one or more reliefs contributing to the proper positioning of the magnets, especially in the radial direction.
- the rotor mass may have an outer contour which is circular or multilobed, a multi-lobed shape may be useful for example to reduce torque ripples or harmonics of current or voltage.
- the rotor can be cantilevered or not.
- the rotor can be made of several rotor pieces aligned in the axial direction, for example three pieces. Each piece can be angularly shifted relative to other adjacent pieces ("step skew" in English).
- the invention further relates to a rotating electrical machine, such as a synchronous motor or a synchronous generator, comprising a rotor as defined above.
- a rotating electrical machine such as a synchronous motor or a synchronous generator, comprising a rotor as defined above.
- the machine can be reluctant. It can constitute a synchronous motor,
- the machine can operate at a nominal peripheral speed (tangential velocity taken at the outer diameter of the rotor) which may be greater than or equal to 100 meters per second.
- a nominal peripheral speed tangential velocity taken at the outer diameter of the rotor
- the machine according to the invention allows operation at high speeds if desired.
- a rotor with a diameter of 100 mm can operate safely at 20000 revolutions per minute.
- the machine can have a relatively large size.
- the diameter of the rotor may be greater than 50 mm, more preferably greater than 80 mm, being for example between 80 and 500 mm.
- the rotor can be inside or outside.
- the machine may also include a stator, which may be concentrated winding or distributed.
- the machine may in particular comprise a distributed winding stator, in particular when the number of rotor poles is less than 8.
- the stator may be wound on teeth.
- the stator may include notches for receiving the windings which are closed on the air gap side, being in particular open on the opposite side to the gap.
- the stator may include diamond-shaped notches, which may improve the filling of the notches and thus the electromagnetic performance.
- wires having a flattened, flattened cross-section may be used to increase the area of copper relative to the usable area of the notch in cross-section.
- FIG. 1 represents in cross-section, schematically and partially, a machine comprising a rotor made according to the invention
- Figures 2 to 4 are views similar to Figure 1, illustrating alternative embodiments.
- FIG. 1 illustrates a rotary electrical machine 10 comprising a rotor 1 and a stator 2.
- the stator 2 comprises for example a distributed winding 22, as illustrated. It comprises notches 21 open towards the air gap, in which the electrical conductors of the winding 22 are arranged.
- This stator makes it possible to generate a rotating magnetic field for driving the rotor in rotation, in the context of a synchronous motor, and in the case of an alternator, the rotation of the rotor induces an electromotive force in the stator windings.
- the rotor 1 shown in FIG. 1 comprises a rotor magnetic mass 3 extending axially along the axis of rotation X of the rotor, this rotor mass being for example formed by a stack of magnetic sheets stacked along the X axis, the plates being for example identical and superimposed exactly. They can be held together by clipping, rivets, tie rods, welds or any other technique.
- the magnetic sheets are preferably magnetic steel. All grades of magnetic steel can be used.
- the rotor mass 3 comprises a central opening 5 for mounting on a shaft 6.
- the shaft 6 may, in the example in question, be made of a non-magnetic material, for example non-magnetic stainless steel or aluminum, or on the contrary be magnetic .
- the rotor 1 comprises a plurality of permanent magnets 7 arranged in corresponding housings 8 of the rotor magnetic mass 3.
- the permanent magnets 7 are arranged in rows 9a, 9b defining the six poles 11 of the rotor, including a first pole and a second pole. pole adjacent to the first pole, the first and second poles being of different polarities.
- the polarity of the first pole of the rotor is defined by two first rows 9a of permanent magnets 7 clean and a second row 9b of permanent magnets 7 shared, which second row 9b also partially defines the polarity of the second pole of the rotor adjacent to the first pole.
- the shared permanent magnet 7 defining the polarity of the first pole also defines the polarity of the second pole of the rotor adjacent to the first pole.
- the second row 9b of permanent magnets 7 thus simultaneously defines the polarities of each of the two consecutive poles of the rotor between which it is located.
- the boundary between the two consecutive poles passes through at least said shared permanent magnet 7.
- the permanent magnets 7 of each of the poles 11 of the rotor are arranged in U oriented towards the gap.
- a row of permanent magnets thus comprises two lateral branches and a central branch.
- the U's of the same pole are arranged in a concentric manner, in other words the U's of the same pole are nested inside each other.
- a U in the example describes a flared shape towards the air gap, the lateral branches of the U being non-parallel to each other.
- the permanent magnets 7 are rectangular in cross section.
- the magnets may be made of ferrite or alternatively of rare earths, for example of neodymium or other type.
- the magnets are made of ferrite.
- the permanent magnets 7 of a second row 9b are of the same width ej in cross section as the permanent magnets of a first row 9a, but it is not beyond the scope of the present invention if it is otherwise, and if the permanent magnets 7 of a second row 9b are wider in cross section than the permanent magnets of a first row 9a, in particular twice as wide.
- FIG. 2 illustrates an alternative embodiment in which the width 3 ⁇ 4 of the permanent magnet 7 of the second row 9b is equal to twice the width e 1 of the permanent magnet 7 of the first row 9a.
- the housings 8 extend radially over a length l 2 greater than the radial length / y of the corresponding magnet, in cross section.
- the ends 8a, 8b of the housing 8 in cross section perpendicular to the axis of rotation are rectangular or triangular. More precisely, the ends 8b of the housings belonging to a second row 9b and defining two consecutive poles 1 1 are rectangular.
- the other ends 8a are generally of generally triangular shape.
- bridges of material 15 which may extend parallel to the radial axis Y of the corresponding pole 11 or be inclined relative thereto.
- radial axis of the pole is meant a Y axis of the pole oriented radially, that is to say according to a radius of the rotor. This is an axis of symmetry for the pole.
- the bridges of material 15 formed between the housings 8 of the first row 9a closest to the air gap extend obliquely towards the radial axis Y of the pole as one moves away from the
- the bridges of material 15 formed between the housings 8 of the second row 9b, the closest to the shaft extend obliquely towards the radial axis Y of the pole when one approaches the
- the bridges of material 15 formed between the housings 8 of the first row 9a closest to the shaft 6 extend parallel to the radial axis Y of the pole.
- the rotor has no bridge of material other than tangential and is in this case devoid of radial bridges 15 as described above.
- the rotor comprises only tangential bridges 16 formed between a housing 8 and the gap.
- each of the rotor poles has a single first row.
- the first row of each of the poles is in these examples disposed in V, the concavity of the row being oriented towards the apex of the pole, that is to say towards the gap.
- the second row 9b extends from the gap to the shaft 6 of the rotor 1, which is a magnetic shaft, the rotor being devoid of a magnetic portion between one end of the row and the shaft.
- the housings defining each of the branches of the same V communicate at their end 8a closest to the axis of rotation X.
- the housings 8 are configured to receive all the permanent magnets of a row.
- the embodiment illustrated in FIG. 3 also differs from that illustrated in FIG. 1 in that the stator 2 comprises notches 21 for receiving the windings which are closed on the air gap side. In addition, these notches 21 are open on the side opposite to the gap.
- the stator 2 comprises a monobloc dental star 25 and an annular raised yoke 26.
- the stator is winding distributed fractionally, having notches 21 formed in the dental star 25.
- the notches 21 are of trapezoidal cross section and the teeth 27 separating the notches have edges parallel to each other. The filling of the notches 21 is done from the outside. After winding, the insert is inserted into the annular bolt 26.
- the embodiment variant illustrated in FIG. 4 differs from that of FIG. 3 in the configuration of the stator, which comprises notches 21 in the form of a diamond tip, which can make it possible to improve the filling of notches 21 and thus the performances. electric.
- the stator of FIG. 4 further comprises a yoke 29 equipped with semi-circular longitudinal ribs 31 intended to house conduits 30 for circulating a cooling liquid.
- the rotor is internal, but it is not beyond the scope of the present invention if the rotor is outside.
- the sheets can be made with holes to allow the passage of connecting rods of the laminations of the rotor mass.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1453220A FR3019949B1 (en) | 2014-04-10 | 2014-04-10 | ROTOR OF ELECTRIC ROTATING MACHINE. |
PCT/IB2015/052593 WO2015155732A2 (en) | 2014-04-10 | 2015-04-09 | Rotor for a rotary electric machine |
Publications (1)
Publication Number | Publication Date |
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EP3130060A2 true EP3130060A2 (en) | 2017-02-15 |
Family
ID=51383803
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15724764.4A Withdrawn EP3130060A2 (en) | 2014-04-10 | 2015-04-09 | Rotor for a rotary electric machine |
Country Status (5)
Country | Link |
---|---|
US (1) | US20170040855A1 (en) |
EP (1) | EP3130060A2 (en) |
CN (1) | CN106165262A (en) |
FR (1) | FR3019949B1 (en) |
WO (1) | WO2015155732A2 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3048703B1 (en) * | 2015-01-20 | 2021-10-06 | GE Energy Power Conversion Technology Ltd | Magnetic mass for rotor, corresponding rotor, electric machine and manufacturing method for that mass |
EP3588764A4 (en) * | 2017-02-27 | 2020-02-26 | Mitsubishi Electric Corporation | Electric power conversion apparatus and dc power transmission system |
US10715017B2 (en) * | 2017-06-02 | 2020-07-14 | Hamilton Sundstrand Corporation | Hybrid synchronous machines |
DE102017005415A1 (en) * | 2017-06-09 | 2018-12-27 | Volkswagen Aktiengesellschaft | Synchronous machine with magnetic flux deflection |
CN108429373B (en) * | 2018-05-08 | 2020-08-11 | 珠海格力电器股份有限公司 | Permanent magnet auxiliary synchronous reluctance motor and electric vehicle with same |
US20230053482A1 (en) * | 2021-08-23 | 2023-02-23 | GM Global Technology Operations LLC | Composite inserts for a rotor lamination |
DE102021210180A1 (en) * | 2021-09-15 | 2023-03-16 | Robert Bosch Gesellschaft mit beschränkter Haftung | Rotor of an electrical machine |
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US3126493A (en) * | 1964-03-24 | Permanent magnet motor | ||
IT1219228B (en) * | 1988-04-21 | 1990-05-03 | Antonino Fratta | SYNCHRONOUS RELUCTANCE ELECTRICAL MACHINE EQUIPPED WITH INTRINSIC POWER SUPPLY MEANS |
JPH11103546A (en) * | 1997-09-29 | 1999-04-13 | Fujitsu General Ltd | Permanent magnet motor |
JP2000050542A (en) * | 1998-07-23 | 2000-02-18 | Okuma Corp | Reluctance motor |
JP4089072B2 (en) * | 1998-10-23 | 2008-05-21 | 三菱電機株式会社 | Permanent magnet embedded motor |
JP2002078259A (en) * | 2000-08-31 | 2002-03-15 | Yamaha Motor Co Ltd | Permanent magnet rotor |
US6703746B2 (en) * | 2002-03-01 | 2004-03-09 | General Motors Corporation | Interior permanent magnet rotor |
DE10345417A1 (en) * | 2003-09-30 | 2005-05-12 | Minebea Co Ltd | Permanent magnet rotor for electric motor has magnets in rotor connected together in pairs at their inner ends by auxiliary magnets |
EP1471621A3 (en) * | 2003-04-24 | 2005-12-14 | Minebea Co., Ltd. | Rotor element for an electrical motor |
US7474029B2 (en) * | 2004-06-14 | 2009-01-06 | General Motors Corporation | Rotor magnet placement in interior permanent magnet machines |
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US8044548B2 (en) * | 2006-08-23 | 2011-10-25 | Kabushiki Kaisha Toshiba | Permanent-magnet-type rotating electrical machine |
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JP5328821B2 (en) * | 2011-02-03 | 2013-10-30 | トヨタ自動車株式会社 | Rotating machine rotor |
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CN103023256B (en) * | 2011-09-26 | 2017-03-01 | 辐射通量实验室私人有限公司 | Magneto |
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JP5948127B2 (en) * | 2012-04-23 | 2016-07-06 | 日立オートモティブシステムズ株式会社 | Permanent magnet rotating electric machine and electric vehicle using the same |
US8760025B2 (en) * | 2012-08-09 | 2014-06-24 | GM Global Technologies Operations LLC | Interior permanent magnet machine having off axis centered arc geometry |
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-
2014
- 2014-04-10 FR FR1453220A patent/FR3019949B1/en active Active
-
2015
- 2015-04-09 CN CN201580019065.3A patent/CN106165262A/en active Pending
- 2015-04-09 US US15/303,432 patent/US20170040855A1/en not_active Abandoned
- 2015-04-09 WO PCT/IB2015/052593 patent/WO2015155732A2/en active Application Filing
- 2015-04-09 EP EP15724764.4A patent/EP3130060A2/en not_active Withdrawn
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2015155732A2 * |
Also Published As
Publication number | Publication date |
---|---|
CN106165262A (en) | 2016-11-23 |
FR3019949A1 (en) | 2015-10-16 |
WO2015155732A2 (en) | 2015-10-15 |
FR3019949B1 (en) | 2018-01-05 |
WO2015155732A3 (en) | 2015-12-17 |
US20170040855A1 (en) | 2017-02-09 |
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