WO2022089920A1 - Rotor für eine permanenterregte synchronmaschine und permanenterregte synchronmaschine - Google Patents
Rotor für eine permanenterregte synchronmaschine und permanenterregte synchronmaschine Download PDFInfo
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- WO2022089920A1 WO2022089920A1 PCT/EP2021/077979 EP2021077979W WO2022089920A1 WO 2022089920 A1 WO2022089920 A1 WO 2022089920A1 EP 2021077979 W EP2021077979 W EP 2021077979W WO 2022089920 A1 WO2022089920 A1 WO 2022089920A1
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- WIPO (PCT)
- Prior art keywords
- rotor
- holding part
- laminated core
- recesses
- permanent magnets
- Prior art date
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 43
- 230000005291 magnetic effect Effects 0.000 claims abstract description 51
- 239000000463 material Substances 0.000 claims description 41
- 238000003475 lamination Methods 0.000 claims description 19
- 229910001220 stainless steel Inorganic materials 0.000 claims description 16
- 239000010935 stainless steel Substances 0.000 claims description 16
- 238000004804 winding Methods 0.000 claims description 5
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- 238000004519 manufacturing process Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
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- 230000004907 flux Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
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- 239000004020 conductor Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- 239000007769 metal material Substances 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
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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]
-
- 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
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- 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
Definitions
- the invention relates to a rotor for a permanent-magnet synchronous machine, having at least one laminated core, which comprises a plurality of laminated sheets stacked in the direction of an axis of rotation of the rotor.
- a plurality of recesses are formed in the laminated core, in which respective permanent magnets are accommodated.
- the respective recess has a first end area which is closer to the axis of rotation of the rotor than a second end area of the recess.
- the invention relates to a permanently excited synchronous machine with such a rotor.
- a rotor of the type mentioned is described for example in DE 199 15664 A1.
- mutually adjacent recesses assigned to a respective magnetic pole of the rotor are arranged in a V-shape for receiving the permanent magnets.
- the V-shapes of the recesses associated with the respective magnetic pole widen in the radial direction.
- this narrow web is referred to as a scattering web.
- the aim is to keep the width of such webs, ie the dimensions of the respective web in the circumferential direction of the rotor, as small as possible. Because in the area of these webs or stray webs, an undesired closing or short-circuiting of the magnetic field lines of the permanent magnets arranged in the recesses occurs, this closing or short-circuiting of the magnetic field lines also being referred to as scattering. This undesired electromagnetic scattering is disadvantageous because the power potential and the torque potential of the electrical machine is reduced as a result of the scattering.
- the mechanical strength of the laminated core is limited by narrow scattering ribs, so that the laminating bundle could tear at the scattering ribs at higher rotor speeds. Consequently, only a correspondingly lower maximum speed can be achieved. A higher speed stability can be achieved with wider spreader bars. However, more scatter then occurs and more magnet mass is required for the same torque. This is disadvantageous because the magnetic material of the permanent magnets is expensive.
- the aim of a higher rotor speed can be to reduce the size of the permanent magnet synchronous machine and thus also the magnetic mass.
- a high speed stability combined with high torque capacity of the synchronous machine leads to high performance.
- An increase in the speed stability can thus be used to increase the power density.
- the provision of narrow webs or spreading webs reduces the speed stability of the rotor, ie the maximum speed up to which the rotor can be operated without the rotor being damaged during operation.
- the laminations used to form the laminated core have favorable electromagnetic properties, but they are associated with comparatively low yield points and low tensile strengths.
- narrow webs are only able to withstand the loads occurring during operation of the rotor, ie during its rotation about the axis of rotation, to a limited extent.
- the thickness of the laminations arranged stacked in the laminated core is comparatively small.
- Webs that are wide in the circumferential direction of the rotor ensure a higher achievable speed stability of the rotor.
- this has the disadvantage of requiring a higher magnet mass if the same maximum torque is to be achieved with the permanent-magnet synchronous machine as when using a rotor with narrower webs.
- narrower webs or scattering webs allow the use of permanent magnets with a lower respective mass. But then only a lower torque of the electrical machine or synchronous machine can be achieved, which has the rotor.
- the object of the invention is to create a rotor of the type mentioned at the outset, by means of which an increased performance of the permanently excited synchronous machine can be achieved with the given permanent magnets, and to specify a permanently excited synchronous machine with such a rotor.
- a rotor according to the invention for a permanent-magnet synchronous machine has at least one laminated core, which includes a plurality of laminated sheets stacked in the direction of an axis of rotation of the rotor.
- a plurality of recesses are formed in the laminated core, in which respective permanent magnets are accommodated.
- the respective recess has a first end area which is closer to the axis of rotation of the rotor than a second end area of the recess.
- the permanent magnets are arranged in recesses which are adjacent to one another in the circumferential direction of the rotor and whose first end regions are closer to one another than the second end regions in the circumferential direction of the rotor such that like poles of the permanent magnets face one another.
- the rotor has at least one holding part separate from the laminated core, by means of which a first section of the laminated core adjoining the adjacent recesses is coupled to a second section of the laminated core adjoining the adjacent recesses.
- the at least one holding part has a lower magnetic conductivity than a partial area of the laminated core whose volume is equal to a volume of the holding part.
- the holding part therefore ensures that in the area in which the holding part holds together the sections of the laminated core adjoining the adjacent recesses, there is less undesirable magnetic scattering in the form of a closing of the magnetic field lines of the permanent magnets than would be the case if instead of the holding part, a partial area in the form of a web of the laminated core would ensure the cohesion of the sections of the laminated core.
- the at least one holding part has the lower magnetic conductivity than a partial area of the laminated core of the same volume, ie a partial area which has the same volume as the holding part. Because of the comparatively low magnetic conductivity of the at least one holding part, there is a reduced degree of closing or short-circuiting of the magnetic field lines of the permanent magnets that are arranged in the adjacent recesses.
- the at least one holding part ensures that the respective sections of the laminated core are held together, which are spaced apart from one another in particular in the radial direction of the rotor and are preferably held together by the holding part in this radial direction.
- the holding part ensures that the rotor has a higher speed stability than would be the case without the provision of the holding part. Consequently, with the given permanent magnets accommodated in the respective recesses, the rotor can be used to achieve increased performance of the permanently excited synchronous machine which has the rotor.
- the at least one holding part causes a reduction in the scattering of the magnetic field lines of the permanent magnets, which are arranged in the adjacent recesses and whose magnetic poles of the same name face each other, a reduction in the magnet mass can be achieved for a given outer diameter of the rotor and, as a result, a Achieve a reduction in manufacturing costs.
- the performance of the permanent-magnet synchronous machine can be increased in the form of an increase in the maximum torque and/or the maximum power.
- the respective advantages of reducing the production costs or increasing the performance are pronounced to different extents.
- the at least one holding part particularly thin webs or webs that are particularly narrow in the circumferential direction of the rotor can also be realized in the form of the holding parts between the first end regions of the adjacent recesses without adversely affecting the speed stability of the rotor.
- lightweight construction potential can be tapped or a rotor with a particularly low weight can be realized.
- the mechanical strength of the rotor in the area of the holding parts can be increased, resulting in higher speed stability.
- the circumferential direction of the rotor corresponds to the direction of rotation of the rotor when it rotates about its axis of rotation.
- the reduction in the scattering of the magnetic field in the region of the holding part can be decoupled from the reduction in speed stability that usually accompanies this.
- the rotor can thus be used in a permanently excited synchronous machine, which at the same time has a high speed stability and a low magnetic mass and also a high maximum torque.
- the at least one holding part preferably has a higher yield point and/or a higher tensile strength than a partial area of the laminated core that is the same as the volume of the holding part. If such a holding part is used in the area of the respective adjacent recesses, namely where the first end areas of the adjacent recesses are close to one another, a particularly high strength of the rotor can be achieved, particularly in the area in which the first section and the second section of the laminated core is coupled or connected to one another by the respective holding part.
- the at least one holding part has the higher yield point and/or the higher tensile strength, the at least one holding part can be used to provide a particularly thin web at this particular point on the rotor, at which the at least one holding part for holding the two sections of the laminated core together cares.
- the at least one holding part can be designed particularly easily. This applies in particular in comparison to a rotor in which the sheet metal material of the stacked sheets of the laminated core is used to achieve the same strength in the area of such webs.
- the at least one holding part is preferably formed from a material which has a lower magnetic conductivity than a material from which the laminations of the laminated core are formed.
- the particularly low magnetic conductivity of the at least one holding part can thus be implemented very easily and with little effort.
- a number of materials can be used as the material for the holding part, for example steel, aluminum, a fiber-reinforced, in particular glass-fiber-reinforced, plastic, ceramic or the like. All of these materials mean that a holding part made of such a material has the lower magnetic conductivity than would be the case for a partial area of the laminated core whose volume is the same as the volume of the holding part. However, from a manufacturing point of view and also in terms of a desirable high Strength of the holding part certain materials particularly suitable for providing the holding part.
- the at least one holding part is therefore preferably formed from stainless steel.
- a particularly good cohesion of the sections of the laminated core can be achieved. This is especially true when the stainless steel or stainless steel allows work hardening and/or hardening in some other way.
- the at least one holding part is preferably formed from stainless steel with an austenitic structure.
- the magnetic conductivity is particularly low.
- such a stainless steel can be cold-worked very well and thus achieve a particularly high material strength.
- the use of stainless steel with an austenitic structure for providing the holding part is advantageous in view of the associated ductility of the holding part. Because then the holding part has a particularly high elongation at break. In other words, the holding part breaks following an initially elastic deformation and after reaching the yield point plastic deformation much later than would be the case when using a material for the holding part from which the laminations of the laminated core are formed.
- the at least one holding part is preferably connected to the sections of the laminated core in a form-fitting manner. As a result, a particularly resilient cohesion of the sections of the laminated core is achieved by the at least one holding part. This is advantageous with regard to the speed stability of the rotor.
- the at least one holding part preferably has a web which connects respective ends of the holding part to one another.
- a first end of the holding part is coupled to the first section of the laminated core
- a second end of the holding part is coupled to the second section of the laminated core.
- the web of the holding part is preferably arranged between the first end regions of the adjacent recesses. In this way, the holding part can ensure that the sections of the laminated core are held together in a particularly effective manner.
- the adjacent recesses are delimited in their first end regions by the web of the holding part.
- the first end areas of the adjacent recesses are particularly close to one another, there is no material of the laminated core at all that would lead to unwanted scattering or to an unwanted closing of the magnetic field lines of the permanent magnets, which in the neighboring Recesses are arranged.
- the permanent magnets accommodated in the adjacent recesses are preferably spaced apart from the web of the holding part.
- the area in the vicinity of the web of the holding part that is not occupied by other material or is not filled with air serves as a magnetic flux brake. This is particularly advantageous for reducing the undesired scattering of the magnetic field lines.
- the ends of the holding part preferably have larger dimensions in the circumferential direction of the rotor than the web of the holding part. In this way, it is very easy to anchor the ends of the holding part to the respective sections of the laminated core.
- the ends of the holding part are forming a respective
- the recordings in are formed in the sections of the laminated core that are coupled to one another by means of the holding part.
- Such a form-fit connection of the holding part with the sections of the laminated core ensures that the holding part can absorb tensile loads particularly well, which occur during operation of the rotor, ie when the rotor rotates about the axis of rotation.
- a thermal joining method or temperature-induced joining method is used to introduce the at least one holding part into the laminated core
- a high tensile load can be absorbed by the holding part positively connected to the sections of the laminated core.
- a joining partner in particular the holding part, can be heated and introduced into the other joining partner in the heated state. The subsequent cooling of the previously heated joining partner then causes the holding part to apply tensile stress to the sections of the laminated core.
- Such a shrinking of one of the joining partners onto the other can also be achieved if the heated joining partner is the laminated core, while the holding part remains cold or is not heated in this joining process.
- An outer contour of the respective end of the holding part preferably corresponds to an inner contour of the corresponding receptacle. In this way, the ends of the holding part can be easily introduced into the corresponding receptacles during manufacture of the rotor.
- the respective end of the holding part is accommodated in the corresponding receptacle essentially without play.
- a particularly good distribution of the tensile loads occurring during the rotation of the rotor about its axis of rotation on the material of the laminated core that surrounds the respective end of the holding part in the region of the respective receptacle can then be achieved.
- the last-mentioned advantage is given to a particular degree when the outer contour of the respective end of the holding part has a round cross section. So if the holding part has round ends or head areas in cross-section, which are also received at least largely without play in the corresponding receptacles, point loads in the area of the sections of the laminated core can be avoided to a particularly large extent, which can occur when the rotor rotates about its axis of rotation. However, it can also be provided that at least one free space is formed between an outer contour of the respective end of the holding part and an inner contour of the corresponding receptacle.
- Such a configuration is advantageous in particular with regard to the assembly, ie the introduction of the at least one holding part into the laminated core in the area of the sections to be coupled to one another.
- tolerances, in particular manufacturing tolerances, of the holding part and/or of the receptacles corresponding to the ends of the holding part can be compensated particularly well if there is at least one free space between the outer contour of the respective end of the holding part and the inner contour of the corresponding receptacle.
- the outer contour of the respective end of the holding part can be mushroom-shaped in cross section, that is to say correspond in cross section to the cross section of a mushroom head.
- Such a configuration of one end or both ends of the holding part enables in particular good support of a respective underside of the mushroom head shape on a corresponding support surface which is provided on the side of the receptacle. This is advantageous with regard to the absorption of tensile loads by the holding part.
- the respective end of the holding part rests with a straight contact surface on a corresponding contact surface of the receptacle.
- the provision of such straight contact surfaces involves less effort in terms of production technology than is the case with curved, in particular round, contact surfaces.
- a good distribution of the load on the respective end of the holding part can be achieved in this way.
- a permanently excited synchronous machine according to the invention has a rotor according to the invention.
- the permanently excited synchronous machine also includes a stator, which has a stator winding for providing a rotating magnetic field.
- the rotating field can be used to cause the rotor to rotate about its axis of rotation.
- FIG. 1 shows a schematic and perspective representation of a rotor for a permanently excited synchronous machine, which has a plurality of laminated cores
- FIG. 2 shows a schematic and perspective plan view in the direction of an axis of rotation of the rotor of one of the stacked laminations which form a respective laminated core of the rotor;
- FIG. 3 schematically shows a section of the rotor, with sections of the laminated core spaced apart from one another in the radial direction being held together by a holding part according to a first variant
- FIG. 4 schematically shows a section of the rotor, with the sections of the laminated core spaced apart from one another in the radial direction being held together by a holding part according to a second variant;
- FIG. 5 is a highly schematic and partial sectional representation of a permanent-magnet synchronous machine with the rotor having the holding parts according to FIG. 1.
- a rotor 1 or runner for a permanent magnet synchronous machine 2 (compare Fig. 5) is shown in a schematic, perspective view.
- the rotor 1 is designed as an internal rotor.
- the structural configuration of the rotor 1 described below can also be used in the case of a rotor designed as an external rotor.
- the rotor 1 rotates about an axis of rotation 3 which is arranged in the center of a rotor shaft 4 of the rotor 1 in the present case.
- the rotor 1 has a plurality of laminated cores 5, only some of which are provided with a reference number in FIG. 1 for reasons of clarity.
- Each of the stacks of laminations 5 has a large number of individual laminations 6 of smaller sheet thickness, one of which is shown schematically and in a plan view in the direction of the axis of rotation 3 in FIG. 2 .
- the laminations 6 are stacked in the respective laminated core 5 in the direction of the axis of rotation 3 and connected to one another, for example by welding.
- about 100 or even more than 100 metal sheets 6 can be arranged stacked in the direction of the axis of rotation 3 in a respective laminated core 5 .
- the individual sheets 6 can be cut out of large rolled sheets, for example by means of a laser tool or a punching tool, with recesses 7 , 8 being able to be made in the respective sheets 6 .
- each individual sheet metal 6 for the rotor 1 of the permanent-magnet synchronous machine 2 has a plurality of recesses 7, 8, of which only a few are provided with a respective reference number in FIG. 2 for reasons of clarity.
- the recesses 7 , 8 are aligned with one another, so that the respective laminated core 5 also has corresponding recesses 7 , 8 .
- Respective permanent magnets 9, 10 are accommodated in the recesses 7, 8 in the rotor 1 of the permanently excited synchronous machine 2 (compare FIGS. 3 and 4), which are not shown in FIG. 2 for reasons of clarity.
- the permanent magnets 9, 10 are arranged in adjacent recesses 7, 8 in such a way that magnetic poles of the same name, i.e. the magnetic north poles N or the magnetic south poles S of the permanent magnets 9, 10 accommodated in the adjacent recesses 7, 8, face each other are.
- the permanent magnets 9, 10 are arranged in such a way that the magnetic north poles N face each other.
- other permanent magnets 9, 10 are arranged such that the magnetic south poles S of the permanent magnets 9, 10 face one another here.
- the sheet metal 6 of which is shown in FIG form In addition, in the rotor 1, the sheet metal 6 of which is shown in FIG form. In the configuration of the laminations 6 shown in Fig. 2, the legs of the V-shape do not intersect in the area of the axis of rotation 3, but rather in the radial direction of the rotor 1 at a distance from the axis of rotation 3, specifically in the area of the laminated core 5.
- the statements made below also apply to a rotor 1 in which the recesses 7 , 8 extend strictly in the radial direction, so that the legs of the V-shape intersect in the area of the axis of rotation 3 .
- the permanent magnets 9, 10 are arranged in all the recesses 7, 8 that are adjacent to one another in the circumferential direction of the rotor 1 in such a way that the magnetic poles N, S of the same name of the respective adjacent permanent magnets 9, 10 face each other.
- the respective orientations of the permanent magnets 9, 10 accommodated in the recesses 7, 8 alternate in the recesses 7, 8 that are adjacent to one another in the circumferential direction of the rotor 1.
- the first end regions 11 of the respectively associated recesses 7, 8 are closer to the axis of rotation 3 of the rotor 1 than the second end regions 12 of these recesses 7, 8.
- webs or material bridges 13 are usually present in the laminated core 5, of which only a few are provided with a reference number in FIG. 2 for reasons of illustration.
- FIG. 2 shows only one of these holding parts 14, of which respective variants are shown enlarged in FIG. 3 and in FIG. In fact, however, such holding parts 14 are also present in the laminated core 5 wherever the material bridges 13 formed from the material of the laminations 6 are shown in FIG.
- the holding parts 14 are therefore located at those points of the laminated core 5 at which, in the adjacent recesses 7, 8, the first end areas 11 of which are closer to one another in the circumferential direction of the rotor 1 than the second end areas 12, the permanent magnets 9, 10 are arranged in such a way that the same poles N, S of the permanent magnets 9, 10 face each other.
- the holding parts 14 thus replace the material bridges 13 usually formed from the material of the respective laminations 6 in the rotor 1 in the laminated core 5.
- the holding parts 14 are formed from a material which has a particularly low magnetic conductivity.
- the magnetic conductivity of the respective holding part 14 is lower than would be the case if the volume occupied by the holding part 14 were formed by a partial area of the laminated core 5, which has the same volume as the holding part 14.
- the low magnetic conductivity of the holding part 14 ensures that in the area of the respective holding part 14 there is no or a particularly low and undesired electromagnetic scattering, ie an undesired closing of the magnetic field lines of the respective permanent magnet 9, 10.
- a closing of the magnetic field lines takes place when a magnetically conductive material such as the material bridge 13 is present in the rotor 1 instead of the holding parts 14 . Because the magnetically highly conductive material of the material bridges 13 ensures that the magnetic field lines of the respective permanent magnets 9, 10 are short-circuited.
- the aim is therefore to keep the width of the material bridges 13 of the respective laminated core 5, which are also referred to as stray webs due to the electromagnetic scattering caused by them, as small as possible.
- thin or narrow material bridges 13 or scattering webs ensure that the rotor has a low speed stability.
- the scattering web or the material bridge 13 between the adjacent recesses 7, 8 is in the present case replaced by the respective holding part 14, which is formed from a magnetically non-conductive material or a material having a particularly low magnetic conductivity.
- the respective holding part 14 can be formed from a non-corrosive or stainless steel with an austenitic structure.
- the holding part 14 can form a scattering web, which is made of stainless steel or high-grade steel, in particular stainless steel with an austenitic structure, and which particularly largely reduces the undesired scattering or the undesired closing of the magnetic field lines of the permanent magnets 9, 10 .
- the holding part 14 ensures a high speed stability of the rotor 1. This is because the respective holding part 14 couples a first section 15 of the laminated core 5 adjoining the mutually adjacent or assigned recesses 7, 8 to a second section 15 of the mutually adjoining recesses 7, 8 adjacent portion 16 of the laminated core 5 (see Fig. 3). In this case, the first section 15 of the laminated core 5 is further away from the axis of rotation 3 of the rotor 1 than the second section 16 of the laminated core 5. Accordingly, the holding part 14 is particularly well suited to the tensile loads occurring when the rotor 1 rotates about its axis of rotation 3 record.
- the holding part 14 assumes the mechanical cohesion of the sections 15, 16, in particular in the area between the V-shaped, adjacent recesses 7, 8, in which the permanent magnets 9, 10 are arranged with the poles N of the same name facing one another (compare Fig. 3).
- a thermal joining process can be used in particular to fix the holding part 14 on or in the laminated core 5 and thus to couple the holding part 14 to the sections 15, 16.
- the holding parts 14 can be connected to the respective sections 15, 16 by welding.
- a web 17 of the holding part 14 preferably forms a respective boundary of the adjacent recesses 7, 8.
- the adjacent recesses 7, 8 can be separated in their first end regions 11 by the web 17 of the holding part 14 be limited.
- the permanent magnets 9 , 10 accommodated in the adjacent recesses 7 , 8 are spaced apart from the web 17 of the holding part 14 .
- the permanent magnets 9 , 10 accommodated in the adjacent recesses 7 , 8 are spaced apart from the web 17 of the holding part 14 .
- the permanent magnets 9, 10 are spaced from an outer edge of the respective recess 7, 8 in the radial direction. Accordingly, magnetic flux barriers or magnetic flux brakes are preferably also provided by the second end regions 12 of the recesses 7, 8 because no material formed by the laminations 6 of the laminated core 5 is present in these second end regions 12 either.
- the electromagnetic design of the rotor 1 leads to a particularly high torque potential and power potential of the permanently excited synchronous machine 2 for a given outer diameter of the rotor 1.
- permanent magnets 9, 10 that are smaller and thus have a lower mass can be used in order to obtain the same performance of the permanently excited synchronous machine 2 as would be the case if the material bridge 13 was provided instead of the web 17 of the holding part 14. It is therefore possible to save on purchasing expensive magnetic mass and/or to increase the performance of the permanently excited synchronous machine 2 .
- the holding part 14 is made of a stainless steel with an austenitic structure, which has a good work hardening potential and is accordingly work hardened, particularly high material strengths of the laminated core 5 can be achieved where the holding part 14 holds the sections 15, 16 together. As a result, particularly thin geometries of the respective holding part 14 are possible.
- respective ends 18, 19 of the holding part 14 are formed with an outer contour that is round in cross section.
- this outer contour corresponds to an inner contour of a respective receptacle 20, 21, which is formed in the region of the respective section 15, 16.
- the receptacle 20 for the end 19 of the holding part 14 has an inner contour that is round in cross section
- the receptacle 21 for the end 18 of the holding part 14 also has an inner contour that is round in cross section.
- the holding part 14 is configured slightly differently than in the variant shown in FIG. According to FIG. 4, the ends 18, 19 different forms than is the case with the holding part 14 shown in FIG. In this case, an outer contour of the respective end 18, 19 is designed in cross section in the manner of a mushroom head or is designed to correspond to the cross section of a mushroom head.
- free spaces 30 are formed between the outer contour of the respective end 18 , 19 and the inner contour of the corresponding receptacles 20 , 21 .
- the provision of these free spaces 30 facilitates the introduction of the holding part 14 into its installation position in the laminated core 5, since the ends 18, 19 can be inserted particularly well into the respective receptacles 20, 21.
- the respective end 18, 19 has a straight contact surface 22 which bears against a corresponding contact surface 23 of the corresponding receptacle 20, 21.
- Straight contact surfaces 22 or corresponding contact surfaces 23 of this type can be provided in a particularly simple manner in terms of production technology.
- a good support of the mushroom-shaped end 18, 19 can be achieved on these contact surfaces 23 provided on the side of the sections 15, 16.
- FIG. 4 also shows part of the rotor shaft 4 of the rotor 1, which is not shown in FIG.
- FIG. 5 the permanently excited synchronous machine 2 is shown with the rotor 1 in a highly schematic sectional view.
- the permanent-magnet synchronous machine 2 has, in a manner known per se, a stator 24 with a stator winding 25 which is only indicated schematically in the present case.
- An air gap 26 is formed between the stator 24 and the rotor 1 .
- a rotating magnetic field can be provided by means of the stator winding 25 , by means of which the rotor 1 can be caused to rotate about its axis of rotation 3 during operation of the permanent-magnet synchronous machine 2 .
- clamping disks 27, 28 or cover disks of the rotor 1 arranged in such a permanently excited synchronous machine 2, between which the laminated cores 5 are arranged pressed against one another.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18/019,938 US20230291254A1 (en) | 2020-10-30 | 2021-10-11 | Rotor for Permanent Magnet Synchronous Machine, and Permanent Magnet Synchronous Machine |
JP2023512356A JP2023547014A (ja) | 2020-10-30 | 2021-10-11 | 永久励磁型の同期機用のロータ及び永久励磁型の同期機 |
KR1020237002938A KR20230025026A (ko) | 2020-10-30 | 2021-10-11 | 영구자석 동기식 기계용 회전자 및 영구자석 동기식 기계 |
CN202180051713.9A CN115885452A (zh) | 2020-10-30 | 2021-10-11 | 用于永久激励的同步电机的转子和永久激励的同步电机 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020128552.3 | 2020-10-30 | ||
DE102020128552.3A DE102020128552A1 (de) | 2020-10-30 | 2020-10-30 | Rotor für eine permanenterregte Synchronmaschine und permanenterregte Synchronmaschine |
Publications (1)
Publication Number | Publication Date |
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WO2022089920A1 true WO2022089920A1 (de) | 2022-05-05 |
Family
ID=78086379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2021/077979 WO2022089920A1 (de) | 2020-10-30 | 2021-10-11 | Rotor für eine permanenterregte synchronmaschine und permanenterregte synchronmaschine |
Country Status (6)
Country | Link |
---|---|
US (1) | US20230291254A1 (de) |
JP (1) | JP2023547014A (de) |
KR (1) | KR20230025026A (de) |
CN (1) | CN115885452A (de) |
DE (1) | DE102020128552A1 (de) |
WO (1) | WO2022089920A1 (de) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19915664A1 (de) | 1999-04-07 | 2000-10-19 | Siemens Ag | Elektrische Maschine mit einem Stator |
JP2009201269A (ja) * | 2008-02-22 | 2009-09-03 | Fuji Electric Systems Co Ltd | 埋込磁石モータおよびその製造方法 |
JP2010193660A (ja) * | 2009-02-19 | 2010-09-02 | Nippon Steel Corp | 分割型回転子及び電動機 |
US20130026871A1 (en) * | 2011-07-29 | 2013-01-31 | General Electric Company | Electrical machine |
DE102016114362A1 (de) * | 2016-08-03 | 2018-02-08 | Feaam Gmbh | Rotor für eine elektrische Maschine sowie elektrische Maschine |
DE102017205858A1 (de) * | 2017-04-06 | 2018-04-19 | Magna powertrain gmbh & co kg | Rotor für eine permanenterregte Synchronmaschine und Verfahren zur Herstellung eines solchen Rotors |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009026287A1 (de) | 2009-07-29 | 2011-02-10 | Sabinski, Joachim, Dr.-Ing. | Permanentmagnetläufer mit geschützt und versenkt angeordneten, tangential ausgerichteten Permanentmagneten bei radialer Ausrichtung der Magnetpole als Innenläuferausführung oder Außenläuferausführung rotierender elektrischer Maschinen und Verfahren zur Montage dieser Permanentmagnetläufer |
DE102018201591A1 (de) | 2018-02-01 | 2019-08-01 | Baumüller Nürnberg GmbH | Rotor |
-
2020
- 2020-10-30 DE DE102020128552.3A patent/DE102020128552A1/de active Pending
-
2021
- 2021-10-11 US US18/019,938 patent/US20230291254A1/en active Pending
- 2021-10-11 WO PCT/EP2021/077979 patent/WO2022089920A1/de active Application Filing
- 2021-10-11 CN CN202180051713.9A patent/CN115885452A/zh active Pending
- 2021-10-11 JP JP2023512356A patent/JP2023547014A/ja active Pending
- 2021-10-11 KR KR1020237002938A patent/KR20230025026A/ko unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19915664A1 (de) | 1999-04-07 | 2000-10-19 | Siemens Ag | Elektrische Maschine mit einem Stator |
JP2009201269A (ja) * | 2008-02-22 | 2009-09-03 | Fuji Electric Systems Co Ltd | 埋込磁石モータおよびその製造方法 |
JP2010193660A (ja) * | 2009-02-19 | 2010-09-02 | Nippon Steel Corp | 分割型回転子及び電動機 |
US20130026871A1 (en) * | 2011-07-29 | 2013-01-31 | General Electric Company | Electrical machine |
DE102016114362A1 (de) * | 2016-08-03 | 2018-02-08 | Feaam Gmbh | Rotor für eine elektrische Maschine sowie elektrische Maschine |
DE102017205858A1 (de) * | 2017-04-06 | 2018-04-19 | Magna powertrain gmbh & co kg | Rotor für eine permanenterregte Synchronmaschine und Verfahren zur Herstellung eines solchen Rotors |
Also Published As
Publication number | Publication date |
---|---|
JP2023547014A (ja) | 2023-11-09 |
US20230291254A1 (en) | 2023-09-14 |
DE102020128552A1 (de) | 2022-05-05 |
KR20230025026A (ko) | 2023-02-21 |
CN115885452A (zh) | 2023-03-31 |
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