WO2022152931A1 - Fabrication d'une unité magnétique pour une machine électrique tournante - Google Patents

Fabrication d'une unité magnétique pour une machine électrique tournante Download PDF

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Publication number
WO2022152931A1
WO2022152931A1 PCT/EP2022/050984 EP2022050984W WO2022152931A1 WO 2022152931 A1 WO2022152931 A1 WO 2022152931A1 EP 2022050984 W EP2022050984 W EP 2022050984W WO 2022152931 A1 WO2022152931 A1 WO 2022152931A1
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WO
WIPO (PCT)
Prior art keywords
rotor
magnetic unit
determined
magnetic
flux density
Prior art date
Application number
PCT/EP2022/050984
Other languages
German (de)
English (en)
Inventor
György FARKAS
Original Assignee
Audi Ag
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 Audi Ag filed Critical Audi Ag
Publication of WO2022152931A1 publication Critical patent/WO2022152931A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
    • 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
    • H02K1/2786—Outer rotors
    • H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/279—Magnets embedded in the magnetic core

Definitions

  • the invention relates to a method for producing a magnetic unit for a rotor of a synchronous machine, a rotor for a synchronous machine, a synchronous machine with a stator and a rotor arranged to rotate with respect to the stator, and a motor vehicle with a rotating electrical machine.
  • a rotating electrical machine is a device that converts electrical energy into mechanical energy, in particular into kinetic energy in the form of a rotation, and/or converts mechanical energy into electrical energy in generator operation.
  • the movement is usually a rotary movement performed by the rotor relative to the stator.
  • the stand is different usually non-rotatably arranged relative to the rotor, that is, the rotary movement is a rotary movement of the rotor relative to the stator.
  • stator and the rotor are linked by means of a magnetic flux, whereby the force effect, namely the torque, is generated during motor operation, which drives the rotor to rotate in relation to the stator.
  • mechanical energy supplied to the rotor can be converted into electrical energy in the form of torque.
  • stator and the rotor generally each have a magnetic unit which, at least on the stator side, comprises a winding through which an electric current flows.
  • the winding can also at least partially have permanent magnets or at least be supplemented by permanent magnets.
  • Rotating electrical machines of the generic type are in particular, for example, induction machines that can be connected to a multi-phase, in particular three-phase, electrical power supply network, specifically synchronous machines, preferably permanently excited and/or separately excited synchronous machines, synchronous machines with a damper cage, asynchronous machines and/or the like.
  • the rotating electrical machine can also be a DC voltage or direct current machine. This can be a shunt machine or a series machine, for example.
  • the rotating electrical machine can be designed both as an internal rotor and as an external rotor.
  • the rotating electric machine is often used to drive the motor vehicle while the motor vehicle is driving as intended.
  • it can also be provided for other drive functions, for example in a window winder, in an oil and/or water pump and/or the like.
  • the invention is particularly concerned with synchronous machines.
  • Magnetic units are used, among other things, to provide and/or conduct the magnetic flux during normal operation of the rotating electrical machine, in particular a synchronous machine.
  • magnetic units of permanently excited rotors generally have one or more permanent magnets for this purpose, which are arranged fixedly on the rotor or on its magnetic unit.
  • at least one electrical winding is usually provided on the rotor side, to which a direct current is applied.
  • US 2008/0054733 A1 proposes providing axial through holes in a rotor core.
  • these holes are located in an inner area of the rotor core, which is usually filled with a rotor shaft.
  • This teaching can therefore only be poorly integrated into conventional designs of electrical machines.
  • An arrangement of axial bores in the rotor shaft also leads to stability problems and the like. Therefore, in the state of the art in the area of the rotor shaft there is generally no axial through bore.
  • DE 10 2017 109 793 A1 deals with methods for checking the quality of a rotor. According to this teaching, an imbalance behavior due to a magnetic flux in the intended operation of the rotating electrical machine should be able to be additionally taken into account. The weight and also the moment of inertia of the rotating electrical machine are not considered critical in this document.
  • DE 10 2019 123 744 A1 discloses an electrical machine with locally coordinated properties.
  • a laminated rotor core should have different metal alloys.
  • can Cavities may be provided to reduce the mass of the rotor core.
  • the known state of the art provides indications for reducing the weight of the electrical machine, in particular also a moment of inertia of the rotor
  • the known measures prove to be of only limited use.
  • an intervention in the magnetic unit of the stator or the rotor can lead to the magnetic guiding properties of the magnetic unit being disturbed, areas of the magnetic unit, for example, becoming saturated more quickly, or even the overall flux guiding properties being reduced, so that the entire available magnetic flux is reduced is. This has an unfavorable effect on the efficiency of the rotating electrical machine.
  • the invention proposes in particular a method for producing a magnetic unit for a rotor of a synchronous machine, wherein:
  • a distribution of a magnetic flux density is determined for a specified operating state of the synchronous machine
  • an area is determined which is at least partially delimited by the at least one boundary line and in which the determined magnetic flux density is less than the specified value and/or equal to the specified value
  • the surface in the magnetic unit is designed as a recess.
  • a magnetic unit is proposed in particular, wherein at least one recess is formed in at least one sectional plane of the magnetic unit, which sectional plane extends transversely to an axis of rotation of the rotor, which has a surface with a clear surface area, the surface is at least partially delimited by at least one boundary line, at which a magnetic flux density determined for a specifiable operating state of the synchronous machine has a specifiable value, so that the determined magnetic flux density within the area is less than the specifiable value and/or equal to the specifiable value.
  • the invention proposes in particular that the rotor be designed according to the invention.
  • the invention proposes in particular that the synchronous machine be designed according to the invention.
  • the invention is based, among other things, on the idea that the flux density is not evenly distributed within the magnetic unit during normal operation in a given operating state of the synchronous machine. This statement is of course particularly true for the magnetic unit of the rotor. It turns out that there are one or more areas within the magnetic unit in which the determined magnetic flux density is comparatively small compared to the magnetic flux density in other areas of the magnetic unit. Based on this finding, corresponding recesses can be provided on the magnetic unit, so that the weight of the magnetic unit can be reduced. If the magnetic unit is that of a rotor, the moment of inertia of the rotor can be reduced accordingly.
  • the recess is preferably formed using a surface that has a clear surface area.
  • the area is at least partially delimited by the boundary line.
  • the boundary line is preferably a closed line which completely surrounds the corresponding area. Provision can be made for the magnetic unit that a plurality of boundary lines delimit a plurality of surfaces which, for example, can be positioned spatially separate from one another. In addition, it is of course also possible that the boundary line is not closed, for example because its opposite ends end on a surface of the magnetic unit or the like.
  • the boundary line can thus be used to determine and/or define the area in which the magnetic flux density is less than the specified value and/or equal to the specified value. A magnetic flux that is essentially irrelevant for the intended function of the synchronous machine is thus conducted within the area.
  • the formation of the recess based on this surface therefore has an effect during intended operation, in particular for the specified driving condition, hardly off. As a result, the reduction in weight and/or moment of inertia can lead to the desired advantage.
  • the specified value is a value for the magnetic flux density, which is preferably a fraction of the magnetic flux density that occurs as a maximum in the magnetic unit in the specified operating state.
  • the predetermined value can be about 10% of the aforesaid maximum flux density, preferably about 4% of the aforesaid flux density or even less.
  • the specified value can also be adjusted taking the area into account, so that the corresponding considerations can also be made for the total magnetic flux conducted.
  • the specified value can be determined such that a magnetic flux of less than 5%, preferably less than 1.5%, particularly preferably less than 0.9%, is affected by the gap for the specified operating state of the synchronous machine. This can be determined based on the determined distribution of the magnetic flux density, taking into account the area.
  • the locally present magnetic flux density can be determined for almost any position in the section plane.
  • the values of the magnetic flux density determined in this way form the distribution and can be compared with the specified value in order to determine one or more boundary lines from it.
  • the at least one delimited area within which the determined magnetic flux density is less than the specified value and/or equal to the specified value is determined on the basis of the at least one boundary line.
  • the determination of the distribution of the magnetic flux density can be achieved by means of a plurality of suitable magnetic field sensors, which can be arranged at as many preferably definable positions of the magnetic unit.
  • the distribution of the magnetic flux density can also be determined using a computer-aided method be determined, for example using a finite element method or the like. Of course, these methods can also be combined with one another in order to improve the determination of the distribution of the magnetic flux density.
  • the at least one surface determined in this way can, for example, accommodate a gas such as air or the like.
  • a gas such as air or the like.
  • several areas can be delimited accordingly, which can be used accordingly for respective recesses.
  • the surfaces are additionally determined in such a way that they have as little as possible any significant influence on synchronization or imbalance, particularly in the case of a rotor.
  • the recess can extend at least partially parallel to the axis of rotation of the rotor.
  • a plurality of recesses separated from one another by a material of the magnetic unit can also be provided in the axial direction.
  • the magnetic unit is preferably formed from a ferromagnetic material, but a paramagnetic material and/or a far magnetic material can also be provided.
  • an electric steel, a suitable ferromagnetic ferrite and/or the like can be provided as the material. If an electric steel is provided, the magnetic unit can be formed in a laminated manner in the manner of a laminated core. The individual laminations are therefore usually stacked in the axial direction, ie along the axis of rotation of the rotor.
  • the recess can be produced in the magnetic unit, for example, by removing appropriate material in the area of the surface the.
  • the magnetic unit is produced as part of an additive manufacturing process.
  • the surfaces that are used to form the recesses can be kept free of material. In this way, the recesses in the magnetic unit can be produced easily and reliably.
  • the surface can have even and/or uneven edges.
  • the surface can have an edge that is at least partially round and/or angular.
  • the edge of the area is at least partially determined by the corresponding boundary line.
  • the boundary line thus preferably determines the contour of the surface in the section plane.
  • the surface delimited in this way can differ in terms of its contour from corresponding axially adjacent surfaces. This can be taken into account in a particularly simple manner using the additive method.
  • the recess in the magnetic unit is designed as a through-opening extending parallel to the axis of rotation.
  • an essentially homogeneous configuration of the magnetic unit can be achieved in the axial direction, which is particularly favorable for production.
  • these can be designed at least partially as through-openings.
  • not all of the recesses need to be in the form of through-openings.
  • a deviating flux flow is determined compared to section planes that are essentially located in the central axial area of the magnetic unit. It is further proposed that a coherent planar area, in which the determined magnetic flux density corresponds to the predetermined value, at least partially adjoins the boundary line and/or at least partially encompasses the boundary line. This flat area can preferably also be used at least partially to form the cutout.
  • the method is particularly advantageously carried out for at least two mutually different axial positions along the axis of rotation, with at least one individual boundary line being determined for each of the axial positions.
  • This makes it possible to design the cutout individually, also in the axial direction, depending on the magnetic flux to be guided in each case or the existing magnetic flux density. As a result, the effects of the recesses on the guiding of the magnetic flux through the magnetic unit can be further reduced.
  • An axial layering with a plurality of corresponding sectional planes can be provided particularly advantageously for the magnetic unit, for which the corresponding magnetic flux densities are determined individually in each case.
  • the specified value is less than 0.5 T, in particular less than approximately 0.35 T, particularly preferably less than approximately 0.33 T.
  • cutouts that are formed using the corresponding predetermined value do not need to have any significant influence on the magnetic properties of the magnetic unit during normal operation.
  • the magnetic unit is produced at least partially by means of an additive manufacturing process or by means of axial stacking of individual sheets.
  • the above-mentioned methods make it possible to make appropriate cut-outs for specifically selectable section planes. ments to be provided as optimally as possible, so that a high reduction in material can be achieved while maintaining the magnetic properties of the magnetic unit. A high degree of reliability of the magnetic unit and of the stator or rotor comprising the magnetic unit can thus also be achieved.
  • the predefined operating state include at least a maximum torque provided by the synchronous machine, a maximum electrical power converted by the synchronous machine, motor operation, generator operation or a direction of rotation of the rotor relative to the stator.
  • the advantageous effect of the invention comes to light particularly in the case of high power and/or high torques.
  • the at least one cutout therefore also has hardly any effect.
  • particular consideration can be given to the fact that, as a rule, significantly greater power is made available for accelerating the motor vehicle than for decelerating. Therefore, it can also prove to be advantageous to take into account in particular the motor operation and/or in particular the direction of rotation of the rotor relative to the stator when the motor vehicle is driving forwards. Depending on the application, however, this can also deviate.
  • At least one recess is assigned to a magnetic pole of the magnetic unit. This makes it possible to achieve a certain symmetry in the circumferential direction, so that effects on the running properties of the rotor in normal operation can be largely avoided. As a result, the synchronous machine as a whole can be further improved.
  • the invention also includes the control device for a manufacturing device for carrying out the method according to the invention.
  • the control device can have a data processing device or a processor device that is set up to carry out an embodiment of the method according to the invention.
  • the processor device can have at least one microprocessor and/or at least one microcontroller and/or at least one FPGA (Field Programmable Gate Array) and/or at least one DSP (Digital Signal Processor).
  • the processor device can have program code which is set up to carry out the embodiment of the method according to the invention when executed by the processor device.
  • the program code can be stored in a data memory of the processor device.
  • the invention also includes developments of the rotor according to the invention, which have features as have already been described in connection with the developments of the method according to the invention. For this reason, the corresponding further developments of the runner are not described again here.
  • the motor vehicle according to the invention is preferably designed as a motor vehicle, in particular as a passenger car or truck, or as a passenger bus or motorcycle.
  • the invention also includes the combinations of features of the described embodiments.
  • the invention also includes implementations that each have a combination of the features of several of the described embodiments, unless the embodiments were described as mutually exclusive. Exemplary embodiments of the invention are described below. For this shows:
  • FIG. 1 is a schematic side view of an electrically drivable motor vehicle with an electric drive device that includes a synchronous machine;
  • FIG. 2 shows a permanently excited rotor of the synchronous machine according to FIG. 1 in a schematic sectional view transversely to an axis of rotation;
  • FIG. 3 shows a schematic sectional view of a sector of the synchronous machine according to FIG. 2, a magnetic flux density determined by means of simulation being shown by means of field lines in magnetic units of a stator and a rotor of the synchronous machine;
  • FIG. 4 shows a schematic enlarged representation of a region IV of the rotor in FIG. 3;
  • FIG. 5 shows a schematic enlarged representation of a region V of the rotor in FIG. 3;
  • FIG. 6 shows a schematic enlarged representation of a region VI of the rotor in FIG. 3;
  • FIG. 7 shows a schematic representation like FIG. 3, in which boundary lines delimit areas in which the magnetic flux density in the magnetic unit of the rotor is smaller than a predetermined value
  • FIG. 8 shows a schematic representation like FIG. 7, in which the surfaces are designed as recesses;
  • FIG. 9 shows a schematic sectional view like FIG. 2 for the rotor according to FIG. 8;
  • FIG. 10 shows a schematic perspective view of the rotor according to FIG. 9;
  • FIG. 11 shows a schematic sectional view of a sector of a further permanently excited synchronous machine
  • FIG. 12 shows a schematic sectional view like FIG. 11 , in which cutouts in the rotor of the synchronous machine are determined and formed as in the previous exemplary embodiment.
  • FIG. 1 shows, in a schematic side view, an electrically drivable motor vehicle, which is embodied here as an electric vehicle 50 .
  • the electric vehicle 50 has an electric drive device 52 which, as a rotating electric machine, comprises a permanently excited synchronous machine 10 for driving the electric vehicle 50 in a designated ferry mode.
  • the electric drive device 52 is also connected via an inverter 56 as an energy converter to a high-voltage battery 54 connected, which is used to supply electrical energy to the drive device 52 .
  • FIG. 3 shows the synchronous machine 10 according to FIG. 1 in a schematic sectional view, with FIG. 3 showing a sector of the sectional view.
  • the synchronous machine 10 has a stator 12, which has a non-designated, essentially circular through-opening in the present case, in which a rotor 16 is rotatably arranged.
  • the synchronous machine 10 is designed for a three-phase AC voltage operation and has a correspondingly adapted stator winding (not designated) for this purpose.
  • the stator winding is arranged in non-designated slots of a laminated stator core of the stator 12 , which forms a magnetic unit of the stator 12 .
  • the rotor 16 is arranged in the passage opening of the stator 12 so as to be rotatable about an axis of rotation 20 .
  • An outer peripheral surface of the rotor 16 is spaced from an inner peripheral surface of the through hole of the stator 12 via an air gap 14 .
  • the stand 12 here has a conventional construction which is known to the person skilled in the art, which is why further detailed explanations with regard to the stand 12 are omitted here.
  • the rotor 16 has a magnetic unit 24 (FIGS. 7, 8) which, in a manner not shown, comprises a laminated rotor core in which permanent magnets 22 are fixed. In this way, a permanently excited rotor 16 is formed.
  • Fig. 2 shows a schematic sectional view of the rotor 16.
  • the rotor 16 has a central through-opening 18 which serves to accommodate a rotor shaft (not shown).
  • the rotor 16 also includes the magnetic unit 24, which in the present case is formed from ferromagnetic sheets of electrical steel that are stacked in the axial direction along the axis of rotation 20 and are electrically insulated from one another.
  • the through opening 18 is provided here by the magnetic unit 24 .
  • the rotor 16 further includes circumferential permanent magnets 22 disposed in respective closed pockets of the magnetic assembly 24 . In this way, the rotor 16 permanently provides alternating magnetic poles in the circumferential direction.
  • the basic function of the permanently excited synchronous machine is known to a person skilled in the art, which is why no further explanations are given in this regard.
  • the invention deals with the question of reducing the weight and/or the moment of inertia of the rotor 16 without significantly impairing the intended function.
  • a simulation of the magnetic field at a maximum drive power as a predetermined operating state of the synchronous machine 10 is determined for the permanently excited synchronous machine 10 using a finite element method.
  • 3 shows a distribution of a magnetic flux density by means of field lines for a sector of the synchronous machine 10 .
  • the magnetic flux density in the areas in question is essentially less than approximately 0.5 Tesla, in particular less than approximately 0.33 Tesla. At least for the specified operating state, these areas essentially do not contribute to the guidance of the magnetic flux. It is therefore possible to remove material from the magnetic unit 24 at this point without impairing the function of the rotor 16, in particular the magnetic unit 24, with regard to the guidance of the magnetic flux. Provision is therefore made for boundary lines 26, 28, 30 to be determined in a respective sectional plane of the magnetic unit 24, as is shown, for example, with reference to FIGS. 3 to 6, at which the determined magnetic flux density has a predetermined value, which is about 0.33 Tesla in the present case. Delimited areas 32, 34, 36 are determined on the basis of these boundary lines 26, 28, 30, in which the determined magnetic flux density is less than the specified value and/or equal to the specified value. This is shown in FIG.
  • FIG. 3 also shows a direction of rotation of the rotor for the specified operating state with an arrow 44 .
  • the predetermined operating state is a rotational direction for driving the motor vehicle 50 in a forward direction.
  • the surfaces 32, 34, 36 of the magnetic unit 24 are formed as recesses 38, 40, 42.
  • the recesses 38 , 40 , 42 are designed as respective through-openings extending to the axis of rotation 20 .
  • the recesses can be made by punching, milling, drilling or other material-removing processes. In an additive process, the recesses can also be produced by omitting material. Combinations of these can of course also be provided.
  • the method according to the invention is not only carried out in a single sectional plane, but in several axially spaced sectional planes, which allows axial deviations in the field profile to also be taken into account in the method according to the invention. Therefore, a respective recess in the axial direction does not need a con- to have a constant contour, but may also vary depending on the course of the field.
  • the specified value is selected to be less than 0.5 Tesla. It has proven particularly advantageous if the value selected is less than 0.35 Tesla, particularly preferably less than 0.33 Tesla.
  • the invention can be used, in particular in the case of a laminated design, to provide the individual sheets with corresponding recesses by means of punching.
  • the laminations can then be stacked in circumferential alignment with one another to form the laminated core as the magnetic unit 24 .
  • the magnetic unit 24 is produced by means of an additive manufacturing process. Of course, this can also be combined with the previous production variant.
  • the rotor manufactured in this way is shown in a schematic sector representation according to FIG. It can be seen that the recesses 38, 40, 42 are formed in accordance with the surfaces 32, 34, 36 according to FIG. In this embodiment, they are designed as through openings in the axial direction with a constant contour.
  • the rotor 16 produced in this way is shown in a schematic sectional illustration in FIG. 10 shows a corresponding perspective schematic representation. It can be seen that one of the cutouts 38 , 40 , 42 is assigned to a respective magnetic pole of the rotor 16 . As a result, symmetry can be achieved in relation to the openings, so that the design of the recesses 38, 40, 42 as through-openings has essentially no influence on the running behavior of the rotor 16, in particular with regard to imbalance or the like.
  • Fig. 11 shows a schematic sectional view of a sector of a schematic sectional view of a further embodiment of a synchronous machine 10 with a stator 12 and a rotor 16, which as a permanent excited runner is formed.
  • the permanent magnets 22 are arranged in a double-V shape in the magnetic unit 24 of the rotor 16, in contrast to the first embodiment according to FIGS.
  • the other design features essentially correspond to what has already been explained for the previous exemplary embodiment, which is why reference is also made to the relevant statements.
  • recesses are also formed in the magnetic unit 24 of the rotor 16 here.
  • the corresponding recesses 46, 48, 58, 60 are shown in the corresponding schematic sectional illustration according to FIG. It can be seen that due to the different arrangement of the permanent magnets 22 compared to the previous embodiment, the contour, the number and the position of the recesses 46, 48, 58, 60 also differ from those of the previous embodiment.
  • a weight saving of 93.14% can be achieved compared to the rotor without cutouts.
  • the rotor 16 achieves a maximum torque of 487.36 Nm in motor operation.
  • a maximum torque of 487.16 Nm is achieved, which corresponds to around 99.96%.
  • Such a minimal loss of torque can easily be compensated for or can also simply be accepted.
  • a significant reduction in the mass moment of inertia can be achieved. This results from the fact that in the sectional view according to FIG. 2 the area is 1,605.7 square millimeters, whereas in the sectional view according to FIG. 9 the area is 1,495.6 square millimeters, ie 6.86% less.
  • the sectional view shows a reduction in the surface area of 7.62%. Accordingly, the weight of the runner 16 is reduced.
  • a maximum torque of 497.22 Nm can be achieved during engine operation if there are no recesses.
  • the torque is -495.65 Nm.
  • the maximum torque in engine operation is 497.17 Nm, which corresponds to a reduction of 0.01%.
  • the maximum torque is 491.93 Nm, which corresponds to a loss of -0.75%.
  • the invention can therefore achieve that the efficiency of the synchronous machine is essentially hardly reduced or essentially remains the same with reduced weight and reduced moment of inertia. Due to the lower weight, a lower mechanical load in the drive train can be achieved. In addition, material can be saved.
  • the reduction in the mass moment of inertia of the runner 16 means that there is less rotating energy in the runner 16 .
  • a faster acceleration or deceleration in relation to the speed of the rotor 16 can be achieved, which is important, for example, in the case of speed synchronization, coupling and decoupling of the rotor 16 to a drive train or the like.
  • faster and better speed and torque control can be achieved.
  • the risk of torsional fractures, such as stub shaft fractures or the like, can be reduced.

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

Abstract

L'invention concerne un procédé de fabrication d'une unité magnétique (24) pour un rotor (16) d'une machine synchrone (10), caractérisé en ce que : au moins dans un plan de coupe de l'unité magnétique (24), lequel plan de coupe s'étend transversalement à un axe de rotation (20) du rotor (16), une distribution d'une densité de flux magnétique est déterminée pour un état de fonctionnement prédéfini de la machine synchrone (10), au moins une limite au niveau de laquelle la densité de flux magnétique déterminée présente une valeur prédéfinie est déterminée, une surface (32, 34, 36) délimitée au moins en partie par la ou les limites dans laquelle la densité de flux magnétique déterminée est inférieure à la valeur prédéfinie et/ou égale à la valeur prédéfinie est déterminée, et ladite surface (32, 34, 36) est formée dans l'unité magnétique (24) sous la forme d'un évidement (38, 40, 42).
PCT/EP2022/050984 2021-01-18 2022-01-18 Fabrication d'une unité magnétique pour une machine électrique tournante WO2022152931A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021100864.6A DE102021100864A1 (de) 2021-01-18 2021-01-18 Herstellen einer magnetischen Einheit für eine rotierende elektrische Maschine
DE102021100864.6 2021-01-18

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DE102022121410A1 (de) 2022-08-24 2024-02-29 Seg Automotive Germany Gmbh Rotor, elektrischen Maschine und Verfahren zum Betreiben einer elektrischen Maschine

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US20080054733A1 (en) 2004-05-12 2008-03-06 Edelson Jonathan S Slotless Ac Induction Motor
US20090045688A1 (en) * 2007-08-16 2009-02-19 Ford Global Technologies, Llc Permanent Magnet Machine
EP3062419A1 (fr) * 2013-10-22 2016-08-31 Mitsubishi Electric Corporation Rotor pour une machine électrique rotative
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