WO2020007766A1 - Rotor - Google Patents

Rotor Download PDF

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Publication number
WO2020007766A1
WO2020007766A1 PCT/EP2019/067529 EP2019067529W WO2020007766A1 WO 2020007766 A1 WO2020007766 A1 WO 2020007766A1 EP 2019067529 W EP2019067529 W EP 2019067529W WO 2020007766 A1 WO2020007766 A1 WO 2020007766A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnet
rotor
laminated core
magnet unit
pockets
Prior art date
Application number
PCT/EP2019/067529
Other languages
German (de)
English (en)
Inventor
Christoph Otto
Michael Jacob
Uwe Klippert
Adrian Cornel POP
Original Assignee
Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg filed Critical Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg
Publication of WO2020007766A1 publication Critical patent/WO2020007766A1/fr

Links

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
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/006—Structural association of a motor or generator with the drive train of a motor vehicle
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/02—Details of the magnetic circuit characterised by the magnetic material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Definitions

  • the invention relates to a rotor of an electrical machine.
  • the electrical machine is a component of a motor vehicle and, for example, a hybrid booster.
  • the invention further relates to an electric motor of a motor vehicle.
  • Brushless electric motors usually have a rotor which is set into a rotational movement by means of a stator.
  • the stator comprises a number of phases, usually three, which are supplied with current by means of electronics.
  • the individual phases are electrically contacted to one another either in a so-called delta connection or in a star connection.
  • the phases generate a rotating magnetic field that drives the rotor.
  • the rotor itself is permanently excited.
  • permanent magnets are attached to the rotor, which interact with the magnetic field generated by the stator.
  • the permanent magnets lie in pockets of a laminated core of the rotor, the individual laminations of which are arranged perpendicular to the rotor axis.
  • the metal sheets lie against one another via an electrically insulating lacquer layer in order to prevent parasitic eddy currents from spreading in the rotor body, which would otherwise reduce the efficiency of the electric motor.
  • the pockets and the permanent magnets themselves each have a cuboid cross section perpendicular to the rotor axis and are arranged, for example, radially in the manner of spokes or in a V-shape.
  • the permanent magnets are offset as far as possible radially outwards in the direction of the stator.
  • the distance between the permanent magnets is comparatively small.
  • the electrical machine mostly blocks comparatively abruptly, so that components driven by the electrical machine or components driving the electrical machine can be damaged. It is also not excluded that the rotor or parts thereof break through a housing of the electrical machine and thus endanger an environment of the electrical machine.
  • the pockets usually have projections directed towards one another at their respective radially outer free ends in order to reduce the radial opening of the pockets.
  • the permanent magnet is thus held in the radial direction by the projections.
  • This requires the permanent magnet to be offset in the direction of the axis of rotation by the thickness of the projections, which reduces the efficiency of the electrical machine.
  • the thickness of the projections must be adapted to the centrifugal forces that arise. Either comparatively inexpensive material is used for the rotor body, which leads to a large thickness of the projections and a low efficiency. Or comparatively stiff material is used for the rotor body, which however leads to increased manufacturing costs.
  • the permanent magnets are arranged in completely closed pockets.
  • the area of the laminated core that surrounds the radially outer end of the permanent magnet must be designed to be comparatively stable.
  • the rotor has a comparatively high speed of rotation. speed
  • the sleeve also serves as protection against magnetic fragments coming loose.
  • it is necessary that a comparatively close fit is achieved between the sleeve and the laminated core, since otherwise the individual components are pulled apart due to the centrifugal forces and thus do not stabilize one another.
  • only a comparatively low manufacturing tolerance can be selected, which increases manufacturing costs.
  • the invention is based on the object of specifying a particularly suitable rotor and a particularly suitable electric motor, reliability and / or a rotational speed being increased in particular.
  • the rotor is a component of an electrical machine, for example a generator or particularly preferably an electric motor.
  • the electric motor is, for example, an asynchronous motor or a synchronous motor.
  • the electric motor is a brushed commutator motor.
  • the electrical machine is particularly preferably designed to be brushless and, for example, a brushless electric motor, in particular a brushless DC motor (BLDC).
  • BLDC brushless DC motor
  • the electrical machine is a component of a motor vehicle, for example an auxiliary unit of the motor vehicle, such as an adjustment drive.
  • the auxiliary unit is a pump or comprises a pump, such as a water or lubricant pump, for example an engine oil or gear oil pump.
  • the electrical machine is a component of an electromotive refrigerant compressor (eKMV) or a heating fan.
  • eKMV electromotive refrigerant compressor
  • the electrical machine is particularly preferably part of a drive Strangs of the motor vehicle.
  • the electrical machine is a generator and in particular acts as an alternator.
  • the electrical machine is part of a braking and / or recuperation system.
  • the electrical machine suitably serves to propel the motor vehicle and is, for example, the main drive of the electric motor.
  • the electrical machine is particularly preferably a hybrid booster.
  • acceleration of an internal combustion engine of the motor vehicle is supported in particular, or the main drive power is briefly applied in the event of a switching operation or the like.
  • the electrical machine thus has a comparatively high output, which in particular is only available for a comparatively short period of time.
  • a torque is essentially continuously applied to the drive train by means of the hybrid booster.
  • the rotor preferably has an axis of rotation.
  • the rotor is suitable, in particular provided and set up, to be rotatably supported about the axis of rotation.
  • the rotor is expediently rotationally symmetrical with respect to the axis of rotation, so that an imbalance is avoided during operation.
  • the rotor has a laminated core which comprises a number of laminations which are stacked on top of one another perpendicular to the axis of rotation.
  • the individual sheets are stacked on top of one another in an identical and / or congruent manner.
  • the sheets are made in particular from transformer sheet or another soft iron and are electrically insulated from one another, in particular by means of a lacquer layer.
  • the laminated core has a number of pockets which are designed to be closed. Each of the pockets thus has an opening at most only in the axial direction, that is to say parallel to the axis of rotation, at one or both of the ends. In contrast, the pockets are closed in the tangential and radial directions and are therefore surrounded by the laminated core.
  • a permanent magnet unit is arranged in each of the pockets.
  • the rotor comprises as many permanent magnet units as there are pockets, and the permanent magnet units are buried in the laminated core.
  • the permanent magnet units are identical to one another, for example of identical construction, which reduces manufacturing costs.
  • the permanent magnet units are made of a ferromagnetic material, for example a ferrite, and / or by means of sintering.
  • the permanent magnet units included rare earths, such as neodymium.
  • the permanent magnet units are made of NdFeB.
  • Each of the permanent magnet units is held by means of a holding element of the laminated core.
  • the holding elements thus stabilize the position of the permanent magnet units, and centrifugal forces acting on the permanent magnet units during operation are introduced into further components of the laminated core by means of the holding elements.
  • the holding elements are thus provided in one piece with further components of the laminated core and, for example, by punching the individual laminates.
  • the holding elements expediently protrude into the pocket assigned to the respective permanent magnet unit.
  • Each holding element is located between the two ends of the respective pocket in the radial direction. In other words, each holding element is spaced from the two radial ends of the respective pockets. For example, the holding elements are located essentially in the middle between the two ends.
  • each holding element is offset from the center to one of the two ends, in particular to the radial outer end, that is to say away from the axis of rotation.
  • Each holding element is expediently offset by at least a quarter, for example a third, of the extent of the pocket in the radial direction away from the radially outer end of the respective pocket in the direction of the axis of rotation.
  • each holding element is also located between the two ends of the associated permanent magnet unit in the radial direction. In other words, each permanent magnet unit also extends in the radial direction on both sides with respect to the respective holding element.
  • the centrifugal forces acting on the permanent magnet units are introduced when the rotor rotates.
  • tors in the laminated core not offset in the area of a radial outer end but towards the axis of rotation.
  • the laminated core is designed to be comparatively robust, so that detachment of the permanent magnets can be prevented comparatively efficiently.
  • damage to the laminated core is avoided, for example due to the holding elements tearing off. It is also possible to make the holding elements comparatively robust without reducing efficiency. It is therefore still possible to position the permanent magnet units at a comparatively large distance from the axis of rotation. It is thus possible to operate the rotor at a comparatively high speed.
  • the rotor is suitable, expediently provided and set up, with a maximum speed of at least 28,000 rpm. or up to 31,000 rpm. to operate.
  • Each of the permanent magnet units suitably has a main direction of expansion.
  • the cross section of each of the permanent magnet units perpendicular to the axis of rotation has an extent in a direction which is greater than twice, three or four times that of the elongation in a direction perpendicular thereto.
  • the course of each permanent magnet unit is therefore parallel to the respective main direction of expansion.
  • Each of the permanent magnet units is preferably at least partially tangentially magnetized.
  • the direction of magnetization is essentially perpendicular to the axis of rotation and / or a main direction of expansion of the permanent magnet units.
  • each permanent magnet unit is further stabilized in the respective pocket and further detachment from the pocket is prevented.
  • the permanent magnet units are expediently introduced into the pockets in the axial direction, for example by means of presses. Alternatively or in combination with this, in particular a heating the laminated core before inserting the permanent magnet units and cooling the laminated core after the permanent magnet units have been installed.
  • each of the permanent magnet units is spaced apart from the laminated core at its radially outer end.
  • each of the permanent magnet units is supported on the laminated core at its radial outer end. Centrifugal forces are thus introduced into the laminated core at the radial outer end of the permanent magnet unit and by means of the holding element.
  • the laminated core in the area of the radially outer end of the permanent magnet units and also the holding elements is comparatively filigree, so that the magnetic properties of the permanent magnet units are changed comparatively little.
  • each of the permanent magnet units is supported at least twice, which increases reliability.
  • each of the permanent magnet units expediently bears against the radial outer end of the respective pocket at its radial outer end, which reduces manufacturing costs. This also improves the spread of magnetic field lines.
  • the laminated core comprises further elements, by means of which each of the permanent magnet units is supported at its radially outer end, which are spaced apart from the radially outer end of the respective pocket.
  • each of the permanent magnet units bears against the laminated core at its radially inner end, in particular at the radially inner end of the respective pocket.
  • the radially inner end of each permanent magnet unit is particularly preferably spaced apart from the radially inner end of the respective pocket and preferably from the complete laminated core, so that a spread of parasitic magnetic field lines, which can lead to a reduction in the efficiency, is expediently prevented is.
  • each of the permanent magnet units has a projection which is directed essentially tangentially in particular.
  • the shark Te elements of the laminated core each have a groove or include this, in which the respective projection lies.
  • each holding element comprises one projection or a plurality of projections, for example 2 or 3.
  • the respective projection is preferably directed at least partially tangentially.
  • the course of the projection is perpendicular to the main direction of expansion, that is to say the course, of the respective permanent magnet unit.
  • each permanent magnet unit is glued to the projection.
  • each permanent magnet unit has a groove in which the respective projection lies.
  • the grooves advantageously run parallel to the axis of rotation, ie in the axial direction, which facilitates assembly.
  • each of the permanent magnet units is preferably in one piece and, for example, with the exception of the possible groove, is cuboid. Manufacturing costs are therefore comparatively low.
  • a cuboid permanent magnet is used for the production, into which the groove is milled in order to create the permanent magnet units. In this way, standard components can be used, which reduces manufacturing costs.
  • each permanent magnet unit has two partial magnets.
  • each permanent magnet unit consists of the two partial magnets.
  • the two partial magnets are expediently magnetized parallel to one another.
  • the two partial magnets are preferably made of the same material and have the same material properties.
  • the two partial magnets are sawn from the same blog, which is created, for example, from a sintered ferrite.
  • the permanent magnet units are expediently created by sawing a cuboid block, so that the two partial magnets are created.
  • the permanent magnet unit thus has the same volume as if it were in one piece, for which reason the magnetic volume remains essentially the same, so that no additional material costs are present.
  • the two partial magnets are cuboidal in design, so that material costs are comparatively low.
  • the two partial magnets have different magnetic ones Properties, for example, are made of different materials.
  • the two partial magnets of each permanent magnet unit are spaced apart in the radial direction (radial direction), and between them the respective projection is arranged in the radial direction.
  • the radially inner partial magnet is expediently supported on the projection and is thus held by means of it.
  • the radially outer partial magnet is preferably supported on the radially outer end of the laminated core. The force that is absorbed by means of the individual parts of the laminated core can thus be determined comparatively exactly, which facilitates a design of the laminated core even for a comparatively high rotational speed of the rotor. Assembly of the individual partial magnets is also simplified.
  • the holding element comprises at least two holding parts, namely the projection and the support at the radially outer end, and one of the holding parts is assigned to each of the partial magnets.
  • the respectively associated holding part is expediently offset radially outward with respect to the respective partial magnet and serves to hold the respectively assigned partial magnet.
  • the respective holding part at least partially surrounds and / or encompasses the radially outer end of the respectively assigned partial magnet.
  • Each holding element preferably comprises two projections, which are located on opposite sides of the pocket and run perpendicular to the main direction of expansion. This improves the absorption of forces in the laminated core.
  • the two projections are spaced from one another, so that the two partial magnets are arranged in a common pocket. As a result, magnetic properties are improved.
  • the partial magnets of each permanent magnet unit preferably have the same thickness, that is to say the same extent, perpendicular to their respective course.
  • the extension of the two partial magnets in the radial direction or along their course, in particular along their main direction of expansion is the same.
  • the radially outer partial magnet has a smaller extent than the radially inner partial magnet in the radial direction or along the respective course.
  • the two partial magnets are arranged congruently along the course of the respective permanent magnet units, ie along the main direction of expansion of the respective permanent magnet units. In other words, there is no offset between the two partial magnets perpendicular to the course of the respective permanent magnet unit.
  • the two partial magnets are thus offset from one another only in one direction along the course of the respective permanent magnet unit, in particular only by the thickness of the projection.
  • the two sub-magnets of each permanent magnet unit are particularly preferably offset from one another perpendicular to the course of the respective permanent magnet unit. In this way, the shaping of the magnetic field created is improved and thus an efficiency is increased.
  • one of the two partial magnets is also rotated with respect to the other, in particular about an axis that is parallel to the axis of rotation.
  • the two partial magnets have a course that is tilted relative to one another, but the tilting is comparatively small, in particular less than 10 °, 5 ° or 2 °.
  • all the radially outer partial magnets are offset either counterclockwise or clockwise with respect to the remaining partial magnets of the same permanent magnet unit.
  • radial outer partial magnets that are adjacent in the tangential direction are offset in the tangential direction with respect to the respective radial inner partial magnet. In this way, the shaping of the magnetic field is further improved.
  • the offset is less than half the thickness of the respective permanent magnet unit, that is to say its extension perpendicular to its course.
  • the thickness of the expansion of the permanent magnet unit understood perpendicular to the axis of rotation and perpendicular to its course.
  • the offset is expediently greater than 10% of the thickness.
  • the offset between 15% and 25% of the thickness and, for example, essentially equal to 20% of the thickness of the respective permanent magnet unit is particularly preferred. In this way, on the one hand, a comparatively effective shaping of the magnetic field is made possible, but the mechanical integrity of the laminated core is nevertheless comparatively little stressed is.
  • each of the pockets is radial.
  • the course of each of the pockets is in each case along an associated radial straight line which intersects the axis of rotation.
  • the two ends of each pocket expediently lie on the respectively associated straight line.
  • each pocket is axisymmetric with respect to the associated radial straight line.
  • the permanent magnet unit is preferably axially symmetrical with respect to the radial straight line assigned to the respective pocket.
  • the course of the permanent magnet unit is parallel to the radial straight line, and / or the permanent magnet unit runs along the radial straight line assigned to the respective pocket.
  • two of the pockets are arranged in a V-shape.
  • the laminated core expediently has an even number of pockets, and the acute angle of each V-shape lies in particular between the axis of rotation in a radially outer end of the laminated core, for example essentially in the middle.
  • the acute angle expediently points radially inwards.
  • the two pockets of each V-shape are preferably axially symmetrical with respect to an associated radial straight line.
  • An angle between 10 ° and 30 ° and, for example, essentially 20 ° is suitably formed between a radial straight line and the respective pockets, a deviation of 5 °, 2 ° or 0 ° being present, for example. All pockets are thus arranged in a substantially zigzag shape due to the V-shape.
  • the laminated core has cutouts which preferably endure completely through it in the axial direction. In this way, weight is reduced.
  • the cutouts are expediently located between pockets next to each other in the tangential direction.
  • two of the pockets are directly adjacent in the tangential direction, and this pair of pockets is surrounded on both ends by one of the cutouts in the tangential direction. This means that the laminated core has half as many cutouts as pockets.
  • the cutouts are expediently assigned to the possible V-shapes and are located between the two pockets of the respective V-shapes, the acute angle of which is formed between the axis of rotation and the radial outer end and / or points radially inward.
  • the rotor preferably comprises a shaft which is made in particular of a stainless steel.
  • the shaft is expediently essentially cylindrical and arranged concentrically to the axis of rotation.
  • the laminated core is preferably placed on the shaft and completely surrounds the shaft at least in one section along the axial direction, that is to say parallel to the axis of rotation. In other words, the shaft is completely surrounded on the circumference at least in sections by means of the laminated core. In this way, a connection of the laminated core to the shaft is simplified. For example, a press fit is realized between the shaft and the laminated core.
  • a tongue and groove connection is realized between the laminated core and the shaft, and for example a groove is made in the laminated core, the shaft or both, within each of which a tongue lies, which for example is a component of Shaft, the laminated core or a separate component.
  • the electric motor is a component of a motor vehicle, for example an auxiliary unit of a motor vehicle, such as an adjustment drive.
  • the electric motor is a component of a pump, a blower or a fan, for example a main fan.
  • the electric motor is particularly preferably part of a drive train of the motor vehicle and expediently a hybrid booster.
  • the electric motor has a stator, which expediently comprises a number of electromagnets which are connected to form a number of phases, for example three phases. The phases themselves are connected to a delta or star connection, for example.
  • the electric motor comprises a rotor with a laminated core and a number of permanent magnet units, each of which is arranged in a respective closed pocket in the laminated core.
  • Each of the permanent magnet units is held by means of a holding element of the laminated core, which is located in the radial direction between the two ends of the respective pocket and the two ends of the respective permanent magnet unit.
  • the holding element is thus located in the radial direction (radial direction) between the two ends of the respective pocket and in the radial direction between the two ends of the respective permanent magnet unit.
  • the rotor is therefore permanently excited.
  • the rotor is preferably mounted rotatably about an axis of rotation with respect to the stator.
  • the stator is preferably arranged concentrically to the axis of rotation.
  • the stator suitably surrounds the rotor.
  • the electric motor is an internal rotor.
  • the electric motor has in particular a maximum speed that is greater than or equal to 27,000 rpm, 29,000 rpm, 30,000 rpm or 31,000 rpm. At such speeds, use as
  • Hybrid boosters are comparatively efficient.
  • the rotor is surrounded by a sleeve, which is made of stainless steel, for example.
  • the rotor is particularly preferably sleeve-free on the circumference.
  • the circumference of the rotor is thus expediently formed by means of the laminated core, and the laminated core in particular borders directly on any air gap which is formed between the rotor and the stator. In this way, a weight of the rotor is reduced.
  • manufacturing tolerances Zen freely selectable. Material and thus manufacturing costs are also reduced. It is also possible to choose a relatively small air gap, which increases efficiency.
  • the advantages and further developments mentioned in connection with the rotor can also be applied analogously to the electric motor and vice versa.
  • FIG. 1 schematically simplified a motor vehicle with an electric motor
  • FIG. 2 schematically simplified in a sectional view along a rotation axis the electric motor with a rotor
  • Fig. 4 in a perspective plan view of a detail
  • FIG. 5 shows a detail of a further embodiment of the rotor in a top view. Corresponding parts are provided with the same reference symbols in all figures.
  • a motor vehicle 2 with a number of wheels 4 is shown schematically simplified.
  • the motor vehicle 2 has a drive train 6, for example 2 of the wheels 4 being driven by the drive train 6.
  • the drive train 6 comprises an internal combustion engine 8 as well as a drive shaft 10 and a differential (not shown in detail) and drive axles.
  • the drive train 6 comprises a hybrid booster 12, which acts on the drive shaft 10.
  • a torque applied to the drive shaft 10 by means of the internal combustion engine 8 is briefly increased, for example when the motor vehicle 2 accelerates comparatively strongly or when the internal combustion engine 8 starts.
  • the hybrid booster acts here 12 preferably at least partially as a starter.
  • the hybrid booster 12 has an electrical machine 14 shown in more detail in FIG. 2 in the form of a brushless electric motor.
  • the electrical machine 14 comprises an essentially hollow cylindrical housing 16, which is closed at the end in each case by means of a bearing plate 18, to each of which a bearing 20 in the form of a roller bearing is connected.
  • a shaft 22 of a rotor 24 is rotatably mounted about an axis of rotation 26, the shaft 22 protruding through the two end shields 18 and thus projecting beyond the housing 16.
  • the rotor 24 also has a laminated core 28 which is arranged within the housing 16 and is placed on the shaft 22.
  • the laminated core 28 completely surrounds the shaft 22 over its full extent in the axial direction, that is to say parallel to the axis of rotation 26, and is non-rotatably connected to the shaft 22, for example by means of a press connection and / or a tongue and groove connection.
  • the rotor 24 is surrounded on the circumference within the housing 16 with the formation of an air gap 30 by a stator 32 which is fastened to the inside of the housing 16.
  • the air gap 30 is limited by means of the stator 32 and the laminated core 28.
  • the rotor 24 has no casing surrounding the laminated core 28, and the rotor 24 is thus without a casing.
  • the stator 32 comprises a number of electromagnets, not shown, which is energized during operation by means of electronics 34, which has a converter, not shown.
  • the electronics 34 are arranged in an electronics compartment 36 which is placed on one of the end faces of the housing 16.
  • the rotor 24 is shown in a sectional representation perpendicular to the axis of rotation 26 and comprises the laminated core 28 placed on the shaft 22.
  • the laminated core 28 completely surrounds the shaft 22 around its circumference.
  • the laminated core 28 comprises a number of individual laminations stacked one above the other in the axial direction, which are structurally identical to one another and electrically opposite one another are isolated.
  • the laminated core 24 has a total of twenty pockets 38 which extend through the laminated core 28 along the axis of rotation 26.
  • two of the pockets 38 are each arranged in a V-shape 40, so that a total of ten such V-shapes 40 are formed.
  • Each of the V-shapes 40 is mirror-symmetrical with respect to a respective radial straight line, which thus intersects the axis of rotation 26.
  • Each of the pockets 38 forms an angle of essentially 20 ° with the associated radial straight line.
  • Each of the pockets 38 thus has a radial and partially tangential course. The acute angle between the two pockets 38 of the same V-shape 40 faces the axis of rotation 26, and the pockets 38 thus provide an essentially zigzag shape.
  • a first recess 42 and a second recess 44 are arranged in each case in the tangential direction between the pockets 38 of each V-shape 40, the second recess 44 being offset radially outward with respect to the first recess 42.
  • the cutouts 42, 44 are thus arranged in the tangential direction between the next but one pockets 38, and the laminated core 28 has a total of ten first cutouts 42 and ten second cutouts 44. Because of the cutouts 42, 44, a weight of the laminated core 28 is reduced.
  • the pockets 38 and the cutouts 42, 44 are arranged in such a way that the rotor 24 or at least the laminated core 28 is rotationally symmetrical with respect to the axis of rotation 26, the angle of symmetry being 36 °.
  • Each of the pockets 38 is closed on the circumference, and the laminated core 28 has, in each of the pockets 28, a holding element 46 on which there are two opposite projections 48 which are perpendicular to the course of the respective pocket 38 and project into it.
  • the two projections 48 are directed towards one another and spaced apart from one another, so that each of the pockets 38 is tapered in the region of the holding element 46.
  • the holding elements 46 that is to say the projections 48, are arranged between the two ends of the respective pocket 38 in the radial direction and are therefore spaced from the two ends.
  • the respective pocket 38 is thus divided into two regions by means of the holding element 46, the extent of the radially outer region essentially corresponds to half the extent of the radially inner region of the respective pocket 38.
  • the radially outer region is offset perpendicular to the course of the respective pocket 38 and is slightly rotated with respect to the respective inner region.
  • a permanent magnet unit 50 is arranged in each of the closed pockets 38.
  • the rotor 24 thus has a total of twenty permanent magnet units 50, of which only four are shown here.
  • Each of the permanent magnet units 50 has two partial magnets 52, which are sawn from a common ferrite block.
  • the partial magnets 52 are cuboid, and the two partial magnets 52 of each permanent magnet unit 50 are assigned to one of the areas of the respective pocket 38.
  • the two partial magnets 52 are surrounded by the laminated core 28 at their radial and tangential limits by means of the laminated core 28, and the permanent magnet units 50 and the partial magnets 52 are embedded in the laminated core 28.
  • the two partial magnets 52 of each permanent magnet unit 50 are spaced apart from one another in the radial direction, and the respective holding element 46 is arranged between them. As a result, a slot 54 is formed between the two partial magnets 52 in the region of the projections 48.
  • Each radially inner of the two partial magnets 52 of the respective permanent magnet unit 50 is supported on the two projections 48, and the radially outer of the two partial magnets 52 of each of the permanent magnet units 50 is supported on the radially outer end of the laminated core 28, namely one radially outer end of the respective pocket 28.
  • the radially outer end of the two partial magnets 52 lies against the radially outer end of the respective pocket 38 at its radially outer end.
  • each of the permanent magnet units 50 is thus held by means of the holding element 46 assigned to the respective pocket 38, namely the radially inside of the two partial magnets 52, and each permanent magnet unit 50 is at its radially outer end, namely the radially outer part magnet 52, supported on the laminated core 28.
  • the holding element 46 is also located between the two ends of the respective permanent magnet unit 50 in the radial direction.
  • the radially inner end of the permanent magnet unit 50 is spaced from the radially inner end of the respective pocket 38, which prevents the formation of parasitic magnetic fields and thus increases the efficiency of the electrical machine 14.
  • each permanent magnet unit 50 rest against the two side walls of the respective pocket 38, which are parallel to the course of the pocket 38, in a form-fitting manner.
  • the course of each permanent magnet unit 50 is essentially parallel to the course of the respective pocket 38.
  • the two partial magnets 52 of each permanent magnet unit 50 are also offset from one another perpendicular to the course of the respective permanent magnet unit 50 and slightly rotated.
  • the offset here is between 15% and 25% of the thickness of the respective permanent magnet unit 50, specifically exactly 20%.
  • the thickness of the partial magnets 52 is the same due to the joint production, so that the offset is essentially a quarter of the thickness of the respective partial magnets 52.
  • the respective radially outer partial magnets 52 which are assigned to the same V-shape 40, are offset towards one another in the tangential direction. In this way, a shaping of the magnetic field, which is created by means of the permanent magnet units 50, is facilitated and an efficiency is improved.
  • each of the permanent magnet units 50 Due to the double support of each of the permanent magnet units 50, it is possible to design the laminated core 28 in the region of the radially outer end of the pocket 38 to be comparatively filigree and to absorb the centrifugal forces acting on the permanent magnet units 50 in a comparatively effective manner. Because of the cutouts 42, 44, the weight of the rotor 24 is also reduced. This makes it possible to operate the rotor 24 even at comparatively high speeds, in particular up to 31,000 rpm.
  • FIG. 4 shows a perspective view of a further embodiment of the rotor 24.
  • Each of the permanent magnet units 50 is in one piece and arranged in one of the pockets 38, which does not change any further are.
  • the volume of these permanent magnet units 50 essentially corresponds to the respective volume of the permanent magnet units 50 of the previous embodiment.
  • the holding elements 46 are modified and formed only by means of a single projection 48 which protrudes into the respective pocket 38.
  • Each of the permanent magnet units 50 has a corresponding groove 56, within which the respective projection 46 lies.
  • the holding element 46 in the form of the projection 48 is arranged in the radial direction between the two ends of the respective pocket 38 and the respective permanent magnet unit 50.
  • each of the permanent magnet units 50 is supported on the laminated core 28 at its radially outer end.
  • each of the permanent magnet units 50 is supported twice.
  • the pockets 38 and thus also the permanent magnet units 50 are arranged in relation to the V-shapes 40, and the second cutouts 44 are enlarged.
  • the first cutouts 42 are arranged in the tangential direction between respectively adjacent V-shapes 40.
  • FIG. 5 shows a modification of the embodiment of the rotor 24 shown in FIG. 3.
  • the permanent magnet units 50 are not changed.
  • the radial inner part magnet 52 is supported by means of the geometric arrangement over the projection 48 formed. The centrifugal force acting on these partial magnets 52 is thus absorbed by the part of the laminated core 28 present between adjacent V-shapes 40.
  • the mass of the permanent magnet units 50 is introduced into the individual areas of the laminated core 28 only to a reduced extent via the form-fitting geometry, which results in increased speed stability.
  • the volume of the permanent magnet units 50 is essentially not increased.
  • the two partial magnets 52 have different specific optimizations, for example a different thickness.
  • the permanent magnet units 52 are supported on the laminated core 28 and have, for example, a milling which is expediently provided by means of the groove 56.
  • each permanent magnet unit 50 has a retaining lug or the like, which lies in a correspondingly configured retaining element 46. Due to the arrangement of the permanent magnet units 50, a magnetic short circuit is preferably prevented, which would otherwise lead to a reduction in the efficiency.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

L'invention concerne un rotor (24) d'une machine électrique d'un véhicule à moteur, en particulier un survolteur hybride, pourvu d'un paquet de tôles (28) et d'un certain nombre d'unités d'aimants permanents (50) dont chacune est agencée dans une pochette (38) fermée respective du paquet de tôles (28). Chacune des unités d'aimants permanents (50) est maintenue au moyen d'un élément de maintien (46) du paquet de tôle (28) qui se trouve entre les deux extrémités de la pochette (38) respective et les deux extrémités de l'unité d'aimant permanent (50) respective dans la direction radiale. L'invention concerne en outre un moteur électrique d'un véhicule automobile.
PCT/EP2019/067529 2018-07-04 2019-07-01 Rotor WO2020007766A1 (fr)

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DE102018210967.2A DE102018210967A1 (de) 2018-07-04 2018-07-04 Rotor
DE102018210967.2 2018-07-04

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WO2020007766A1 true WO2020007766A1 (fr) 2020-01-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113644768A (zh) * 2021-08-13 2021-11-12 北京中科三环高技术股份有限公司 电机转子及ipm电机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013178436A2 (fr) * 2012-06-02 2013-12-05 Volkswagen Aktiengesellschaft Rotor pour moteur electrique
CN105264747A (zh) * 2013-06-05 2016-01-20 法雷奥电机设备公司 旋转电机的转子以及包括这种转子的旋转电机
WO2017073821A1 (fr) * 2015-10-30 2017-05-04 전자부품연구원 Rotor et moteur de type à aimants permanents l'intégrant
EP3229348A1 (fr) * 2016-04-04 2017-10-11 Valeo Equipements Electriques Moteur Rotor pour machine électrique tournante

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006011729A1 (de) * 2006-03-14 2007-09-20 Siemens Ag Rotor einer permanenterregten Synchronmaschine
JP5382222B2 (ja) * 2010-07-23 2014-01-08 トヨタ自動車株式会社 ロータとｉｐｍモータ
JP2014171372A (ja) * 2013-03-05 2014-09-18 Toyota Industries Corp 回転電機の永久磁石埋設型回転子及び回転電機
FR3032839B1 (fr) * 2015-02-16 2018-05-04 Alstom Transport Technologies Rotor de moteur electrique et moteur electrique correspondant
JP2017135923A (ja) * 2016-01-29 2017-08-03 トヨタ自動車株式会社 モータ用ロータ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013178436A2 (fr) * 2012-06-02 2013-12-05 Volkswagen Aktiengesellschaft Rotor pour moteur electrique
CN105264747A (zh) * 2013-06-05 2016-01-20 法雷奥电机设备公司 旋转电机的转子以及包括这种转子的旋转电机
WO2017073821A1 (fr) * 2015-10-30 2017-05-04 전자부품연구원 Rotor et moteur de type à aimants permanents l'intégrant
EP3229348A1 (fr) * 2016-04-04 2017-10-11 Valeo Equipements Electriques Moteur Rotor pour machine électrique tournante

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113644768A (zh) * 2021-08-13 2021-11-12 北京中科三环高技术股份有限公司 电机转子及ipm电机

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