Magnetic element with minimized imbalance

Abstract

The invention relates to a method for producing a magnetic unit (10) that is able to be rotated about an axis of rotation D, that is in particular substantially rotationally symmetrical about the axis of rotation D, that comprises a magnetic element (100) having a permanent-magnetic magnetic component (1) and that comprises in particular a bushing and / or shaft (3) that is connected to the magnetic element (100) and extends along the axis of rotation D. The magnetic element (100) comprises a non-magnetic additional component (2) connected to the magnetic component (1). The additional component (2), following connection to the magnetic component (1), is machined on the basis of the defined imbalance value so as to set the mass distribution of the additional component (2) with respect to the axis of rotation D. The magnetic component (1) is connected to the additional component (2) such that both the additional component (2) and the magnetic component (1) each form a portion of a radial and an axial outer surface of the magnetic unit (10), or that the additional component (2) is enclosed at least partially by the magnetic component (1) and at least a section of an outer surface of the magnetic unit (10) is formed by the outer surface of the additional component (2).

Description

[0001] Imbalance-minimized magnetic component

[0002] The invention relates to a magnetic assembly with a magnetic component and a method for producing a magnetic assembly.

[0003] Magnetic components that can be rotated about a rotational axis, which are the starting point for the magnetic assembly described in the present application and are therefore referred to as generic in the following, are used in a wide variety of applications. For example, magnetic components of the generic type are used, in particular as rotor magnets of electric motors or as sensor magnets, in household appliances or in the automotive industry, for example in steering systems, pumps, motors or the like. The magnetic components are used as sensor magnets and / or rotor magnets, for example for position detection, in particular for detecting the angle of rotation, speed and / or torque, and / or in drive motors. Depending on the application, the magnetic components are usually fixedly connected to a shaft and / or a bushing. Magnetic components of the generic type are usually small components that have a volume of less than 50 cm 3 , especially less than 30 cm 3, especially less than 10 cm 3 , especially less than 5 cm 3and which are attached to rotating elements so that their rotational position or speed can be determined and / or an electric drive can be achieved. In order to guarantee the most trouble-free operation possible in the respective application, the magnetic components or assemblies into which the magnetic components are integrated should rotate as smoothly as possible about a rotational axis. Normally, the smooth running of an assembly is ensured by balancing before commissioning or during manufacture. In this case, unbalance properties of the assembly are determined using suitable measuring methods that are sufficiently well known in the state of the art. These unbalance properties can be caused, for example, by design deviations from rotational symmetry about the rotational axis, by manufacturing deviations and / or by material inhomogeneities, i.e.caused by a particularly local inhomogeneous spatial mass distribution relative to the axis of rotation, and an unbalance detected as a result is reduced until a predefined unbalance tolerance is reached, for example by subsequently providing additional material to the assembly and / or by subsequently removing material from the assembly. A body is unbalanced if it has such an asymmetrical mass distribution that its axis of rotation does not coincide with one of its principal axes of inertia. A mass distribution is perfectly symmetrical if the mass is spatially evenly distributed around the axis of rotation.It is well known that balancing assemblies with magnetic components is particularly complex, even using conventional methods for eliminating imbalance. This is because the magnetic components are difficult to machine due to their permanent magnetic properties. This means that balancing of the magnetic components is usually not carried out; instead, the magnetic components are manufactured directly with the lowest possible imbalance, or an attempt is made to compensate for their imbalance by measures on the assembly. This is because if the imbalance of a conventional magnetic component is reduced by removing permanent magnetic material, for example by removing the material using appropriate separating machining processes, the removed material agglomerates due to its permanent magnetic properties and adheres magnetically to the magnetic component and / or to the tool used to remove the material.In such a case, the removed material has to be laboriously removed from the magnetic component and / or the tool, which is time-consuming and often cannot be done without leaving residue. In addition, magnetic components of this type are often required to have defined magnetic properties, for example a remanent flux density of at least 100 mT, in particular at least 200 mT, in particular between 200 mT and 350 mT, in particular at least 400 mT, in particular at least 650 mT, in particular at least 800 mT, and not to exceed a certain installation space. Instead of balancing, other design measures are used to try to keep the influence of an imbalance in the magnetic component on smooth running as low as possible, which limits the design freedom. In some cases, this type of production of the magnetic component, i.e. production of the magnetic component and in particular of parts to be attached to it, such as e.g.a bushing or a shaft with a manufacturing accuracy that makes subsequent reduction of the imbalance unnecessary is not possible and / or not economically viable.

[0004] A method for producing a magnet assembly according to the preamble of claim 1 and a magnet assembly according to claim 10 are known, for example, from US 2009 / 0139078 A1. The document US 2009 / 0139078 A1 describes the rotor of an electric drive of an exhaust gas turbocharger, wherein the rotor is arranged on a motor shaft of the turbocharger. The rotor comprises a cylindrical permanent magnet which is arranged between an inner and an outer sleeve, wherein the outer sleeve is made of a non-magnetizable material and the outer sleeve has an axial projection. By remachining or trimming the axial projection, it is intended to be possible to compensate for imbalance after completion of the component. The sleeve is shrunk with prestress onto the permanent magnet and end rings provided on the end face, wherein the sleeve and the end rings completely enclose the permanent magnet.

[0005] Such a configuration has the disadvantage that the encapsulation of the permanent magnet causes a reduction, albeit a slight one, in the magnetic flux density. In addition, such an arrangement for sensor purposes has the disadvantage that the enclosure of the outer surface of the permanent magnet increases a possible distance to a contact or sensor, which may not be desirable in some circumstances, particularly if the permanent magnet only has a weak magnetic field. The known magnetic component is designed for high rotor speeds, so the preload of the shrink fit has to be correspondingly large. However, this has the disadvantage that machining of the additional component is only possible axially in the sense of removing the axial excess.

[0006] Further prior art is known from the publications DE 10 2017 206 437 Al , DE 103 39 621 Al and WO 2022 / 070857 Al .

[0007] The object of the present invention is to at least partially remedy at least one of the aforementioned disadvantages. In particular, one object of the invention is to provide a method for producing a magnetic assembly with a magnetic component, in which reducing the imbalance of the magnetic assembly is simplified, and / or to provide a component or of the magnetic component or of the magnetic assembly with the lowest possible imbalance.

[0008] According to a first aspect of the invention, the invention proposes as a solution a method for producing a magnet assembly according to claim 1.

[0009] The method according to the invention is characterized in particular in that the magnetic component is connected to the additional component in such a way that both the additional component and the magnetic component each form a portion of a radial and an axial outer surface of the magnetic assembly, or the additional component is at least partially enclosed by the magnetic component and the outer surface of the magnetic assembly is formed at least in sections by the outer surface of the additional component.

[0010] This ensures in particular that the magnetic component also has a portion of a radial outer surface of the magnetic assembly.

[0011] A radial outer surface, in general and within the meaning of the invention, is understood to mean a surface during a intended rotation of the magnet assembly about a rotational axis. The radial outer surface is thus the externally accessible surface of the magnet assembly, which faces radially away from the rotational axis of the magnet assembly. The radial direction, of course, runs perpendicular to the rotational axis.

[0012] An axial outer surface is generally understood, within the meaning of the invention, to be a surface accessible from the outside which extends essentially in a plane spanned perpendicular to a rotational axis, for example an end face of the magnet assembly. The outer surface is understood to mean the entire outer surface of the magnet assembly. The outer surface of the magnet assembly thus comprises the axial and radial outer surfaces of the magnet assembly. The outer surface preferably consists of the axial and radial outer surfaces.

[0013] The method is used to produce a magnetic assembly that can be rotated about an axis of rotation. The method is intended to achieve the smallest possible imbalance in the magnetic assembly and thus to prevent such imbalance - of course as far as possible. The method according to the invention uses a magnetic assembly with a magnetic component that includes a permanent magnetic component and a non-magnetic additional component connected to the magnetic component. The magnetic assembly can furthermore include a bushing and / or a shaft. The magnetic assembly can, for example, consist of the magnetic component alone or of the magnetic component and a bushing and / or shaft. The magnetic assembly therefore has a plurality of components, in any case the magnetic component and the additional component of the magnetic component, in particular furthermore a bushing and / or shaft as components of the magnetic assembly.In an embodiment in which the magnet assembly consists of the magnet component, the additional component can be designed as a bushing or shaft. In an embodiment in which the magnet assembly has a bushing and / or shaft in addition to the magnet component, the additional component is preferably designed neither as a bushing nor as a shaft. At least one of the components of the magnet assembly, in particular at least one of the components of the magnet assembly provided in addition to the additional component, in particular the magnet component, has an imbalance related to the axis of rotation, which is to be at least partially compensated by adjusting the mass distribution of the additional component. The magnet assembly as a whole usually has a volume of less than 100 cm. 3 , especially less than 70 cm 3 , especially less than 50 cm 3The volume of the magnetic component usually corresponds to a proportion of at least one third, in particular at least half, in particular at least two thirds of the total volume of the magnetic assembly. The additional component preferably has a mass which is less than 1 / 3, in particular less than 1 / 5, in particular less than 1 / 10 of the mass of the magnetic component. According to the invention, the method comprises determining a value of an unbalance of the magnetic assembly relative to the axis of rotation of at least one component of the magnetic assembly in order to avoid an unbalance of the magnetic assembly relative to the axis of rotation.For example, the determination of a value of an unbalance related to the axis of rotation of at least one component of the magnetic assembly can be carried out by determining an unbalance of at least the magnetic component or of at least the bushing and / or shaft or of at least the magnetic component connected to the bushing and / or shaft or of the magnetic component as a whole and / or of the magnetic assembly as a whole. The additional component has a mass distribution related to the axis of rotation, i.e. defined around the axis of rotation as the reference axis, wherein the mass distribution of the additional component is adjusted as a function of the determined unbalance of the at least one component of the magnetic assembly in order to compensate for this unbalance. The said mass distribution of the additional component is thus adjusted in a targeted manner, in particular asymmetrically, relative to the axis of rotation so that the determined unbalance can be compensated for.Through compensation, an imbalance of the magnetic assembly is avoided wherever possible. For example, the compensation can be carried out in such a way that the imbalance of the magnetic assembly after implementation of the method is less than 30%, in particular less than 20%, in particular less than 10% of the stated determined imbalance.

[0014] The magnetic component is already connected to the additional component before the process is performed. For example, the additional component can first be connected to the magnetic component, after which the imbalance of at least one component of the magnetic assembly is determined, and the mass distribution of the additional component is adjusted depending on the detected imbalance.

[0015] To reduce the imbalance of the magnet assembly, the additional component is preferably machined before and / or after the additional component is connected to the magnet component, depending on the imbalance detected, in order to produce the mass distribution in the additional component explained, which is specifically adjusted with respect to the axis of rotation and, in particular, is specifically adjusted asymmetrically for compensation. To avoid the imbalance of the magnet assembly, only the mass distribution of the additional component is adjusted, whereas the mass distribution of the magnet component and, in particular, the bushing and / or shaft remains unchanged, so that the detected imbalance is avoided, i.e. reduced if possible, only by changing the mass distribution of the additional component. The magnet component comprises the magnet component and the additional component, which are connected, in particular in a rotationally fixed manner, in particular directly, in particular non-detachably, i.e.are connected to one another in a manner that cannot be separated without destruction. The magnetic component is preferably designed to be rotationally symmetrical about the axis of rotation, at least in sections, with an axial section of the magnetic component being taken into account that preferably comprises at least 50%, in particular at least 70% of the extent of the magnetic component.

[0016] The magnetic component is permanently magnetic, i.e. it is made of a magnetizable material and is permanently magnetized.

[0017] Particularly preferably, the magnetic component is magnetized in such a way that it comprises at least two magnetic poles that lie next to one another along a plane perpendicular to the axis of rotation and, in particular, are arranged opposite one another with respect to the axis of rotation or that lie next to one another along the axis of rotation. In particular, the magnetic component is subject to an imbalance with respect to the axis of rotation. The additional component is non-magnetic, i.e., in particular, it is made of a non-magnetic material, and can be machined, in particular, to change its mass distribution around the axis of rotation.Non-magnetic materials are understood to be materials which cannot be permanently magnetized and in particular have paramagnetic or diamagnetic properties, in particular have a permeability of substantially 1, wherein the permeability preferably deviates from the value 1 by less than 0.1, in particular by less than 0.05, in particular by less than 0.01.

[0018] Preferably, the additional component has an approximately symmetrical mass distribution in relation to the axis of rotation before it is machined, i.e. in particular that an imbalance of the additional component before it is machined in relation to the axis of rotation is negligible in relation to an unbalance tolerance defined for the magnet assembly in relation to the axis of rotation. Generally preferably, due to the detected unbalance of at least one component of the magnet assembly, in particular of the magnetic component, in particular of the magnet assembly, a center of mass of at least a section of the component or of the magnetic component or of the magnet assembly is spaced from the axis of rotation in such a way that when the component or of the magnetic component or of the magnet assembly rotates about the axis of rotation, the component or the magnetic component or of the magnet assembly is acted upon.the magnet assembly is subject to an unbalance force which is dependent on the mass of the center of mass and at least on an angular velocity about the axis of rotation as well as a radial distance of the center of mass from the axis of rotation, the unbalance force being reduced by the asymmetrical mass distribution of the additional component.

[0019] The imbalance particularly preferably comprises at least a static and / or a dynamic imbalance. The proportion that the moment of inertia of the additional component makes up of the moment of inertia of the magnetic component is preferably greater than the proportion that the mass of the additional component makes up of the mass of the magnetic component, in particular at least 2 times, in particular at least 3 times, in particular at least 5 times as large. The proportion that the moment of inertia of the additional component makes up of the moment of inertia of the magnetic unit is preferably greater than the proportion that the mass of the additional component makes up of the mass of the magnetic unit, in particular at least 2 times, in particular at least 3 times, in particular at least 5 times as large. The moment of inertia of the additional component therefore preferably makes up a greater proportion of the moment of inertia of the magnetic unit or of the magnetic component than its mass makes up of the mass of the magnetic unit orof the magnetic component. This means that the additional component can have a sufficient influence on the imbalance with the lowest possible mass. The moment of inertia is based on the moment of inertia with reference to the axis of rotation. In general, the mass of the magnetic component is preferably at least 3 times, in particular at least 5 times, in particular at least 10 times the mass of the additional component. The additional component can thus be realized cost-effectively and only for.

[0020] Fine adjustment of the imbalance of the magnet assembly should be provided.

[0021] According to a further aspect, the invention further proposes a magnetic assembly which is particularly preferably produced using the method according to the invention. The magnetic assembly comprises a magnetic component with a permanent magnetic magnetic component and a non-magnetic additional component which is connected to the magnetic component. In embodiments, the magnetic component or additional component and magnetic component can each have features which are disclosed in connection with embodiments of the method according to the invention described here. The magnetic assembly can consist of the magnetic component. In one embodiment, the magnetic assembly comprises a bushing and / or shaft in addition to the magnetic component.The additional component has a mass distribution relative to the rotational axis, which is adjusted, in particular asymmetrical, in such a way that an imbalance of at least one other component of the magnetic assembly is at least reduced, in particular compensated. The other component is, of course, one of the components of the magnetic assembly that is not the additional component.

[0022] The mass distribution of the additional component is thus adjusted with respect to an unbalance of at least one other of the components in order to compensate for this unbalance.

[0023] The magnet assembly according to the invention is characterized in particular in that the magnet component is connected to the additional component in such a way that both the additional component and the magnet component each form a portion of a radial and an axial outer surface of the magnet assembly, or the additional component is at least partially enclosed by the magnet component and the outer surface of the magnet assembly is formed at least in sections by the outer surface of the additional component.

[0024] The adjusted, in particular asymmetrical, mass distribution of the additional component is particularly preferably generated by at least one method step of the method according to the invention. In particular, the adjusted mass distribution is generated by machining the additional component after it has been connected to the magnetic component. Preferably, the additional component has an asymmetrical mass distribution relative to the rotational axis prior to machining, the asymmetrical mass distribution being selected depending on the detected imbalance.

[0025] The inventors have unexpectedly discovered that the provision of a non-magnetic additional component as described above, which is or is connected to the magnetic component, is sufficient to effectively reduce the imbalance of the magnetic assembly in favor of improved smoothness of operation. The invention provides that the additional component is non-magnetic in order to enable simple machining and manufacturing of the additional component. In the magnetic assembly according to the invention, machining and manufacturing of the magnetic assembly or the magnetic component or its additional component is simplified using conventional machining methods to reduce the imbalance, without this resulting in disadvantages for the magnetic properties.The inventors have recognized that by providing an additional component that is easy to implement, an otherwise existing imbalance can be adequately compensated, wherein this additional component is specifically provided to compensate for the imbalance. On the one hand, an imbalance that can be detected before the magnetic component is connected to the additional component can be reduced by suitable selection of the additional component and in particular by machining the additional component. On the other hand, an imbalance of the magnetic assembly that can in particular only be detected after the additional component has been connected to the magnetic component can be reduced by suitable machining of the additional component, in particular by adding material to the additional component and / or removing material from the additional component.It has proven particularly advantageous to reduce the imbalance of the magnetic assembly both by appropriately selecting the additional component before connection to the magnetic component and by machining the additional component after connection to the magnetic component. The method according to the invention and the magnetic assembly according to the invention thus advantageously provide a magnetic assembly that is at least largely free of imbalance and can be easily integrated into an assembly without its imbalance having to be compensated for in the assembly or without it leading to adverse behavior of the assembly.

[0026] The method is particularly preferably further characterized in that the determined value of the unbalance is compared with a predefined unbalance tolerance, wherein it is determined that the value of the unbalance lies outside the unbalance tolerance. The unbalance tolerance is particularly preferably quantified by a suitable characteristic variable, wherein in particular the characteristic variable is composed of several characteristic numbers. The value of the unbalance preferably lies outside the unbalance tolerance if a determined value corresponding to the characteristic variable is greater than a value of the characteristic variable.The characteristic variable or at least one of the characteristic numbers preferably comprises a product of a permissible radial distance of the center of mass from the axis of rotation and an angular velocity and in particular at least one constant, wherein a value of the characteristic variable or the characteristic number of the unbalance tolerance is particularly preferably a maximum of 16 mm*g, in particular a maximum of 6.3 mm*g, in particular a maximum of 2.5 mm*g, in particular a maximum of 1 mm*g. In particular, the characteristic variable or at least one of the characteristic numbers comprises a product of the permissible radial distance of the center of mass from the axis of rotation and a mass of the magnetic component. Preferably, the characteristic variable or one of the characteristic numbers comprises a product of the mass of the magnetic component, the permissible radial distance of the center of mass from the axis of rotation and the quadratic angular velocity. In particular, subsequently, i.e.after the magnetic component has been connected to the additional component, in particular after all components of the magnetic unit have been connected to one another and / or after the additional component has been machined, a new unbalance value is determined and compared with the unbalance tolerance, it being determined that the new unbalance value lies within the unbalance tolerance. In general, the unbalance determined before the magnetic component is connected to the additional component is particularly preferably the unbalance of the magnetic component or of the magnetic unit without taking the additional component into account. In general, the unbalance determined after the magnetic component and additional component have been connected is particularly preferably the unbalance of the entire magnetic unit.

[0027] The additional component for producing the magnet assembly is preferably machined before and / or after the additional component and magnet component are connected in such a way that material of the additional component is removed from an outer side of the additional component facing away from the magnet component in order to produce the set, in particular asymmetrical, mass distribution, wherein the outer side is set to a position in which the magnet component and additional component are connected. In particular, the material is removed by machining, in particular in several steps, in particular with a geometrically defined and / or geometrically undefined cutting edge, for example by milling, turning, grinding or drilling and / or by means of a laser. In particular, less than 10%, in particular less than 5%, in particular at least 0.2% of the mass of the additional component is removed.Preferably, in general terms, the magnetic component is advantageously not machined to reduce the imbalance of the magnetic assembly after the imbalance has been detected. Particularly preferably, the material of the additional component is removed in a region of the additional component which extends over less than 30%, in particular less than 20%, in particular less than 10%, of the extent of the additional component in a specific direction. Particularly preferably, the region is divided into at least two separate sub-regions arranged at a distance from one another, each of the sub-regions comprising less than 1%, in particular less than 0.5% of the extent of the additional component. When defining the region or the sub-regions, the focus is on the extent of the additional component before machining after the imbalance has been detected.

[0028] According to a preferred embodiment, the additional component has at least one projection, in particular at least before machining. Any asymmetry of the mass distribution of the additional component is preferably predominantly caused by the projection, in particular to at least 80%, in particular at least 95%. In particular, if the projection is neglected, the additional component has an approximately symmetrical mass distribution with respect to the axis of rotation. The projection preferably extends radially towards the magnetic component and / or radially away from the magnetic component, in particular without resting on the magnetic component when the magnetic component and additional component are connected. In particular, the projection is formed on a side of the additional component facing away from the magnetic component.The additional component is preferably connected to the magnetic component and the projection is arranged relative to the magnetic component in such a way that the imbalance of the magnetic assembly generated at least in part by the imbalance of the magnetic component is reduced.

[0029] The magnetic component is preferably designed as a plastic-bonded permanent magnet. Generally speaking, the magnetic component is or will be produced, in particular by means of an injection-molding process and / or by means of a pressing process, from a compound which comprises magnetic particles and a polymeric carrier material in which the particles are embedded. Preferably, at least the magnetic particles of the magnetic component are magnetized after and / or during the injection-molding process and / or pressing process in order to magnetize the magnetic component. Particularly preferably, the polymeric carrier material comprises at least one, in particular semi-crystalline, thermoplastic, in particular at least one polyethylene and / or polyamide and / or polyphenylene sulfide and / or polyphenylene oxide.The polymeric carrier material particularly preferably consists predominantly, in particular to at least 60%, in particular to at least 80%, of polyamide, in particular of PA6 and / or PA11 and / or PA12. The polymeric carrier material preferably comprises at least one thermosetting plastic, in particular epoxy resin. The magnetic particles particularly preferably have an average particle size of at least 0.4 pm to 120 pm, in particular from 0.5 pm to 5 pm, in particular from 1 pm to 5 pm. The magnetic particles are preferably hard magnetic particles, in particular rare earth particles. In one embodiment, at least 70%, in particular at least 80% of the particles are ferrites, for example strontium ferrites, barium ferrites and / or samarium cobalt. In one embodiment, at least 70%, in particular at least 80% of the particles are preferably neodymium-containing and / or samarium-containing particles, for example particles of neodymium-iron-boron compounds.In particular, the compound consists of at least 30 wt.%, in particular at least 40 wt.%, in particular at least 70 wt.%, in particular not more than 95 wt.% magnetic particles. This can ensure particularly good magnetic properties. Generally, the magnetic component can preferably have a remanent flux density of at least 200 mT, in particular at least 400 mT, in particular at least 500 mT, and in particular less than 900 mT.

[0030] Particularly preferably, the additional component is made of a material that has a higher density than the material from which the magnetic component is made. Preferably, the material from which the magnetic component is made has a density of 2 to 5 g / cm 3 , especially 3 to 4 g / cm 3By providing a higher density of the additional component, the required processing of the magnetic component to reduce the imbalance of the magnetic component can be minimized. Particularly preferably, the density of the material of the additional component is at least 1.5 times, in particular at least 2 times, in particular at least 2.5 times as high as the density of the material of the magnetic component. Generally, the density of the additional component is at least 2.59 g / cm 3 , especially more than 5 g / cm 3 , especially more than 8 g / cm 3. Particularly preferably, the additional component has a homogeneous density distribution. In particular, the magnetic component has a homogeneous density distribution. A homogeneous density distribution is understood to mean a density distribution whose density deviation is less than 5%, in particular less than 0.5%, in particular less than 0.05%, compared to a density mean value when examining at least 10 samples each with a volume of at least 5 mm 3 , especially approx. 10 mm 3 , amounts.

[0031] According to a preferred embodiment, the magnetic component has an inhomogeneous mass distribution. The inhomogeneous mass distribution refers to an inhomogeneous spatial mass distribution within the entire extent of the magnetic component. In particular, the total volume of the additional component is less than 25%, in particular less than 15%, in particular less than 10%, in particular at least 1%, in particular at least 3%, of the total volume of the magnetic component and / or the total mass of the additional component is at least 2%, in particular at least 5%, in particular at least 10%, in particular at least 15%, in particular at least 20%, in particular at least 30%, in particular less than 40%, in particular a maximum of 30% of the total mass of the magnetic component.Preferably, the total volume of the magnetic component is at least 75%, in particular at least 85%, of the total volume of the magnetic component and / or the total mass of the magnetic component is less than 95%, in particular less than 90%, in particular less than 85% of the total mass of the magnetic component. As a result, machining of the additional component or an asymmetrical mass distribution of the additional component in order to reduce the imbalance of the magnetic component caused by the imbalance of the magnetic component can be further reduced. Generally speaking, a mass moment of inertia of the additional component is particularly preferably at least 5%, in particular at least 10%, in particular at least 20%, in particular at least 30% of a mass moment of inertia of the magnetic component relative to the axis of rotation.

[0032] According to a particularly advantageous aspect of the invention, the magnetic component is or will be connected to the additional component by injection molding, in particular directly, in particular in such a way that an outer side of the additional component is at least partially accessible from the outside of the magnetic assembly, i.e. in particular at least 30%, in particular at least 40%, of the outer side of the additional component. This can make the production of the magnetic component or of the magnetic assembly more efficient. Those skilled in the art are familiar with injection molding processes as special injection molding processes. For the purposes of the invention, injection molding processes also include overmolding processes.

[0033] The method can provide for the additional component to be connected to the magnetic component as an insert in an injection mold by injection molding or overmolding.

[0034] The additional component is preferably at least partially enclosed by the magnetic component, in particular in such a way that the magnetic component and the additional component overlap and bear against one another axially and radially over at least 30%, in particular at least 50%, of the extent of the additional component. In general, it is particularly preferred that the outer surface of the magnetic assembly is formed in sections by the outer surface of the additional component. This simplifies subsequent machining of the additional component. In a preferred embodiment, the additional component is formed by injection molding onto the magnetic component. In another preferred embodiment, the additional component is formed by injection molding onto the magnetic component.The injection molding is preferably carried out in such a way that the additional component is inserted into a cavity of an injection mold as intended or is initially formed in the cavity, whereupon the compound is injected into the injection mold to produce the magnetic component, wherein the additional component is embedded in the compound, wherein in particular the magnetic component is subsequently removed from the cavity. The magnetic assembly preferably has a bushing and / or shaft, wherein the magnetic component is connected to the bushing and / or shaft by injection molding, so that during the production of the magnetic component, it is manufactured directly connected to the bushing and / or shaft.

[0035] According to a preferred embodiment of the method, the additional component is connected to the magnetic component at least in a force-fitting manner, in particular by means of a press connection, wherein in particular the magnetic component and the additional component each bear against one another in a force-fitting manner via corresponding, radially facing holding surfaces, wherein in particular at least one of the holding surfaces extends, preferably continuously, at least partially, i.e. in particular over more than 180°, in particular completely, around the axis of rotation, whereby an additional form-fitting connection of the additional component and the magnetic component perpendicular to the axis of rotation is preferably ensured. In general, the magnetic component is particularly preferably designed such that the additional component is connected to the magnetic component at least in a force-fitting manner, in particular as described above.Particularly preferably, the additional component is pushed onto the magnetic component relative to the magnetic component by a joining movement, which in particular comprises a sliding movement along the axis of rotation, in particular while forming the force-fitting and in particular the form-fitting connection, in particular until it rests against a stop surface of the magnetic component, in particular an axial one, i.e. one that generally points in the axial direction with respect to the axis of rotation. Accordingly, the magnetic component can be or be force-fittingly connected to a bushing and / or shaft of the magnetic assembly.

[0036] Generally advantageously, the additional component is arranged radially from the axis of rotation, wherein in particular the magnetic component at least partially fills an intermediate space arranged radially between the additional component and the axis of rotation, in particular to at least 50%, in particular to at least 60%, in particular to at least 70%, and in particular to no more than 90%. As a result, the set, in particular asymmetrical, mass distribution of the additional component can be used particularly advantageously to reduce the imbalance of the magnetic component, since the imbalance generated by an unbalanced mass increases with its distance from the axis of rotation. Particularly preferably, a predominant proportion of the volume and / or the mass of the magnetic component, in particular at least 65%, in particular at least 75%, in particular at least 85%, is spaced from the axis of rotation by a smaller distance than the additional component.

[0037] According to a preferred embodiment, the magnetic component is connected to the additional component in such a way that the additional component forms a portion of a radial and an axial outer surface of the magnetic assembly. In particular, an asymmetry of the mass distribution of the additional component is created at least partially by machining the portion of the outer surface. This improves the machinability of the additional component after it has been connected to the magnetic component. Generally speaking, the additional component is preferably annular, in particular around the axis of rotation. In particular, the magnetic component is connected to the additional component in such a way that the magnetic component encloses the additional component on a maximum of three, in particular a maximum of two, sides of the additional component, wherein in particular at least one of the sides is an axial side of the additional component.According to a generally advantageous embodiment of the magnetic component, the magnetic component and the additional component are materially connected to one another. In a preferred embodiment, the magnetic component and the additional component are glued to one another. For this purpose, the additional component preferably has an axial and / or radial adhesive surface and the magnetic component a corresponding radial and / or axial adhesive surface, with an adhesive layer being arranged between the adhesive surfaces, by means of which adhesive layer the adhesive surfaces are permanently connected. In one embodiment, the magnetic component and the additional component are welded to one another. Generally preferably, the method comprises connecting the magnetic component to the additional component by gluing and / or welding, in particular as described above.

[0038] In an advantageous embodiment, the magnet assembly is designed to be rotationally symmetrical about the rotation axis over a section of its extension, in particular an uninterrupted section, whereby an imbalance of the magnet assembly can be reduced structurally. The section preferably comprises at least 70%, in particular at least 80% of the extension of the magnet assembly. The section particularly preferably comprises at least 70%, in particular at least 80%, in particular at least 90%, of the axial extension of the magnet assembly, i.e. the entire extension of the magnet assembly in the axial direction. The section particularly preferably comprises at least 40%, in particular at least 60%, in particular at least 80% of the extension of the

[0039] Magnetic component and / or the extension of the additional component.

[0040] According to a preferred embodiment of the magnetic component, the magnetic component has an outer side section which extends completely around the axis of rotation with its circumferential length, wherein the additional component extends along the outer side section over at least 50%, in particular at least 70%, in particular at least 80% of the circumferential length around the axis of rotation, in particular adjoining it over at least 50%, in particular at least 70% of the circumferential length. The additional component thus extends over a considerable proportion of the circumference of the outer side of the magnetic component, so that the explained compensation of the imbalance can be achieved in a particularly targeted and finely dosed manner by the additional component. In general, the additional component is preferably designed such that it extends around the axis of rotation in the manner of a ring.Generally preferably, the magnetic component has, at least in sections, a basic shape in the manner of a cylinder, in particular in the manner of a circular cylinder, the cylinder axis of which coincides with the axis of rotation, wherein in the above-mentioned preferred embodiment the cylinder jacket preferably forms the outer side section. Generally particularly preferably, the magnetic component extends in the manner of a ring around the axis of rotation. Particularly preferably, the magnetic component extends substantially in a ring shape, i.e. in particular with at least 70%, in particular at least 85%, of its extent, around the axis of rotation. The magnetic assembly therefore has improved rotational symmetry.

[0041] In general, the additional component and the magnetic component preferably extend within the same axial section along the axis of rotation, or the additional component is directly adjacent to the magnetic component with respect to the axis of rotation. As a result, the magnetic component can be manufactured compactly, and the imbalance of the magnetic assembly can be influenced particularly advantageously by the additional component. In general, the magnetic component particularly preferably has at least one axial end section, wherein the additional component is or is connected to the magnetic component by being fastened to the axial end section of the magnetic component, i.e. in that the additional component is fastened to the axial end section of the magnetic component.An end section is understood to be a section of the axial extent of the magnetic component that extends continuously over a maximum of 45%, in particular a maximum of 30%, in particular a maximum of 20%, in particular a maximum of 10% of the extent of the magnetic component along the axis of rotation and comprises an absolute axial end of the magnetic component. In particular, the additional component is arranged with at least 90% of its extent at the level of the end section.

[0042] In general, the additional component is or is preferably formed from at least two additional parts, which are preferably separate and in particular of identical design at least before the additional component is processed. The additional parts can be fastened to the magnetic component in order to connect the magnetic component and the additional component, in particular independently of one another. Particularly preferably, a first of the additional parts is or is fastened to a first axial end section of the magnetic component and a second of the additional parts is or is fastened to a second axial end section of the magnetic component, in particular in the same way, in particular as described above for connecting the magnetic component and the additional component. Each of the additional parts is preferably arranged with at least 90% of its extent at the level of the respective end section to which it is fastened.The axial end sections each have one of the two absolute axial ends of the magnetic component, wherein the end sections are preferably spaced apart by a central section which in particular comprises at least 15%, in particular at least 40%, in particular at least 60%, of the axial extent of the magnetic component. The axial end sections are in particular integrally connected, in particular by the central section. The additional parts are preferably designed in the same way. According to one embodiment, the additional parts are made of the same material. According to another embodiment, the additional parts can be made of different materials, wherein in particular the density of the different materials differs. The first additional part particularly preferably has a greater moment of inertia with respect to the axis of rotation than the second additional part.This is particularly advantageous if, before connecting the magnetic component and the additional component, it is apparent that a greater reduction in the imbalance of the magnetic assembly is required at one of the axial end sections of the magnetic component than at the other axial end section of the magnetic component. In general, the additional parts can, together and / or independently of one another, have features disclosed in connection with the additional component.

[0043] Preferably, the imbalance of the at least one component of the magnet assembly can be broken down at least into a first partial imbalance of the first end section and a second partial imbalance of the second end section, wherein in particular a first centrifugal force generated by the partial imbalance of the first end section upon rotation about the axis of rotation acts at least partially in a different direction perpendicular to the axis of rotation than a second centrifugal force generated by the partial imbalance of the second end section upon rotation about the axis of rotation. D . h .preferably that a first center of mass spaced from the axis of rotation can be determined for a portion of the mass of the magnetic component encompassed by the first end portion, and a second center of mass spaced from the axis of rotation can be determined for a portion of the mass of the magnetic component encompassed by the second end portion, wherein the centers of mass of the end portions are spaced from the axis of rotation at different radial distances and / or in different directions perpendicular to the axis of rotation.

[0044] Particularly preferably, the first additional part has a mass distribution in the additional part that is adjusted, in particular asymmetrical, with respect to the rotational axis in such a way that the first partial imbalance is at least partially compensated. Alternatively or additionally, the second additional part has a mass distribution that is adjusted, in particular asymmetrical, with respect to the rotational axis in such a way that the second partial imbalance is at least partially compensated.

[0045] The imbalance of the magnet assembly is or is preferably prevented as far as possible in that at least one, in particular both, of the additional parts each have a set, in particular asymmetrical, mass distribution related to the axis of rotation and are or are selected depending on the detected imbalance. Additionally or alternatively, the imbalance of the magnet assembly is or is prevented as far as possible in that at least one, in particular both, of the additional parts are / is or are machined before and / or after their connection to the magnet component depending on the detected imbalance in order to produce the set, in particular asymmetrical, mass distribution related to the axis of rotation. This means in particular that the first additional part and the second additional part each have a differently set, in particular asymmetrical in a different way, mass distribution.This makes it particularly advantageous to reduce dynamic and / or static imbalances as well as a superposition of static and dynamic imbalance of the magnetic component.

[0046] The respective machining of the additional parts is preferably carried out as described above in connection with the additional component, for example by removing material. The machining is particularly preferably carried out on an axial outer surface of the respective additional part and / or on a radial outer surface of the respective additional part. The first additional part is preferably designed to correspond to the first end section and the second additional part to correspond to the second end section such that a respective center of mass, which can be determined from the proportion of the mass of the magnetic component of the respective end section and the mass of the respective additional part, has a smaller radial distance from the axis of rotation than a respective center of mass, which can be determined from the proportion of the mass of the magnetic component of the respective end section and preferably lies at least approximately on the axis of rotation.

[0047] In general, the additional component, in particular at least one of its additional parts, is particularly preferably made from a non-magnetic, metal-containing material, in particular from a non-magnetic metal alloy which comprises at least zinc and / or copper and / or is designed as non-magnetic stainless steel, in particular from zinc and / or copper. Particularly preferably, at least one of the additional parts of the additional component, in particular the additional component, is made from brass. A non-magnetic stainless steel has a permeability of essentially 1; insignificant deviations from the value 1 are, as explained above, included in the statement “essentially 1”. As stainless steel, for example, a known non-magnetic and therefore non-magnetically conductive VA material can be used.According to one embodiment, the additional component, in particular at least one, in particular both, of its additional parts, is made from a compound comprising non-magnetic particles and the polymeric carrier material in which the non-magnetic particles are embedded. Preferably, the additional component has a higher proportion of particles than the magnetic component.

[0048] In one embodiment, the magnetic assembly is designed as a fan wheel having fan wheel blades. The fan wheel blades are designed, as is known from conventional fan wheels, to ensure air movement, in particular with a main direction of movement parallel to the axis of rotation, when the magnetic assembly rotates about the axis of rotation. The fan wheel blades are formed by the magnetic component and / or the additional components, particularly preferably by the magnetic component. The inventors have recognized that by providing the additional component, a practically unbalance-free fan wheel can be provided in a particularly simple manner, which fan wheel can in particular simultaneously serve as a rotor magnet. Accordingly, the invention further relates to an electrically driven fan having a fan wheel and an electric motor having a rotor, wherein the rotor and the fan wheel are formed jointly by the magnetic assembly.

[0049] According to a further aspect of the invention, the invention relates to a sensor arrangement which comprises a first unit and a second unit, wherein the first unit is rotatable relative to the second unit over an angle of rotation about an axis of rotation. For this purpose, the units are preferably rotatably mounted relative to one another. The first unit comprises a detector, in particular a Hall sensor, and the second unit comprises a magnetic assembly according to the invention, in particular manufactured according to a method according to the invention. The detector is designed to determine the angle of rotation or a parameter dependent on the angle of rotation. The detector is preferably arranged relative to the magnetic assembly in such a way that a magnetic field of the magnetic component of the magnetic assembly can be detected by the detector in order to determine the angle of rotation or the parameter dependent on the angle of rotation.The detector is designed to generate a measurement signal which is dependent on the magnetic field of the magnetic component of the magnetic assembly in order to determine the angle of rotation or the parameter which is dependent on the angle of rotation. The sensor arrangement can comprise one or more features which are disclosed above in connection with the magnetic assembly according to the invention or the method according to the invention. The sensor arrangement preferably comprises a shaft to which the magnetic assembly is fixed in a rotationally fixed manner with respect to a rotation of the shaft about its shaft axis, wherein the angle of rotation of the shaft about the shaft axis can be determined by the detector by detecting the magnetic field of the magnetic component of the magnetic assembly. The invention also comprises a use of the magnetic assembly according to the invention for producing the sensor arrangement according to the invention or the fan according to the invention having features of the method according to the invention.In general, the method according to the invention or the magnetic assembly according to the invention can comprise features which are disclosed in connection with generic magnetic components, the method according to the invention, the magnetic assembly according to the invention, the fan according to the invention or the sensor arrangement according to the invention.

[0050] The invention is explained in more detail below with reference to 14 figures using exemplary embodiments, each of the figures showing a different exemplary embodiment of a magnet assembly according to the invention in a schematic principle representation.

[0051] In the figures, identical parts are provided with identical reference symbols.

[0052] Figure 1 shows a first exemplary embodiment of a magnetic assembly 10 according to the invention in a schematic diagram. The magnetic assembly 10 according to the invention is designed to be substantially rotationally symmetrical about an axis of rotation D with a circular ring-shaped basic shape and in this case consists of a magnetic component 100. The magnetic component 100 comprises a magnetic component 1 which is subject to an imbalance related to the axis of rotation D and is made from a permanent magnetic material, and an additional component 2 which is made from brass. During the production of the magnetic component 100, the magnetic component 1 was directly connected to the additional component 2 by injection molding the magnetic component 1 onto the additional component 2. The additional component 2 is embedded in the magnetic component 1 in such a way that an axial and a radial outer surface of the additional component 2 each form a section of the outer surface of the magnetic component 100.In order to reduce an imbalance of the magnetic component 100 which is caused by an imbalance of the magnetic component 1 about the axis of rotation D, material is removed from a radial outer surface in an area of ​​the additional component 2 by machining in such a way that a depression in the form of a bore is created in two spaced-apart sub-areas of the area. Before machining, the additional component 2 has a symmetrical mass distribution with respect to the axis of rotation D, wherein the creation of the depressions by machining removal of material from the additional component 2 creates an asymmetrical mass distribution with respect to the axis of rotation D. This asymmetrical mass distribution compensates for an imbalance of the magnetic component 1 with respect to the axis of rotation D.

[0053] Figure 2 shows a schematic diagram of a second exemplary embodiment of a magnet assembly 10 according to the invention, which consists of a magnet component 100. In this exemplary embodiment, the additional component 2 comprises a first additional part 21 and a second additional part 22. Both additional parts 21, 22 are each made of brass, are each connected to the magnet component 1 by injection molding and, after being connected to the magnet component 1, are machined depending on the imbalance of the magnet component 1 in a similar way to the additional component 2 in the first exemplary embodiment in order to produce an asymmetrical mass distribution of the additional component 2 with respect to the axis of rotation D. The first additional part 21 is fastened to a first axial end section 11 of the magnet component 1 and the second additional part 22 is fastened to a second axial end section 12 of the magnet component 1.In the second exemplary embodiment, the additional parts 21, 22 are machined in such a way that the asymmetrical mass distribution of the first additional part 21 largely compensates for a first partial unbalance of the first end section 11 and the asymmetrical mass distribution of the second additional part 22 largely compensates for a second partial unbalance of the second end section 12 which is different from the first. The first additional part 21 and the second additional part 22 are machined differently to produce their respective asymmetrical mass distribution. For example, in one partial area of ​​the first additional part 21 a certain mass of material is removed and in a last partial area of ​​the second additional part 22 a different mass of material is removed. The magnetic component 1 has both a static unbalance and a dynamic unbalance. While it is already sufficient to reduce the static unbalance if the additional component 2 orIn order to connect only one of its additional parts 21, 22 to the magnetic component 1 at a designated location, it is necessary to fasten both additional parts 21, 22 of the additional component 2 to one of the end sections 11, 12 of the magnetic component 1 in order to reduce the dynamic imbalance.

[0054] Figure 3 shows a schematic diagram of a third exemplary embodiment of a magnetic assembly 10 according to the invention, which consists of a magnetic component 100. The additional component is connected to the magnetic component 1 in such a way that the additional component 2 forms a portion of an axial outer surface of the magnetic component 100 and the magnetic component 1 forms the radial outer surface of the magnetic component 100, whereas in the aforementioned exemplary embodiments, the additional component 2 each forms a portion of the radial and the axial outer surface of the magnetic component 100. As a result, the entire radial outer surface of the magnetic component 100 can be designed to be permanently magnetic, which is generally advantageous.In the third exemplary embodiment, the imbalance of the magnetic component 100 caused by the imbalance of the magnetic component 1 is reduced by material being removed from an axial outer surface of the additional component 2 in order to create a depression and thus an asymmetrical mass distribution. Figure 4 shows a fourth exemplary embodiment of a magnetic assembly 10 according to the invention, which consists of a magnetic component 100 in which the additional component 2 is adhesively bonded to a corresponding axial adhesive surface of the magnetic component 1 by means of an axial adhesive surface. Additional component 2 and magnetic component 1 are each of hollow cylindrical construction, with an essentially circular cross-section, as in the other exemplary embodiments shown.The basic shape of the additional component 2 and the magnetic component 1 is matched to one another in such a way that an extension of the magnetic component 1 along the axis of rotation D is continued approximately without interruption by the extension of the additional component 2 along the axis of rotation D, which is generally advantageous. The additional component 2 already has an asymmetrical mass distribution related to the axis of rotation D before it is connected to the magnetic component 1 and is selected depending on the determined imbalance of the magnetic component 100 or the magnetic component 1. After the additional component 2 has been connected to the magnetic component 1, the additional component 2 was machined on one of its axial outer surfaces on its outer side pointing axially away from the magnetic component 1 in order to change the asymmetrical mass distribution in order to compensate for the imbalance of the magnetic component 100.

[0055] Figure 5 shows a fifth exemplary embodiment of a magnetic assembly 10 according to the invention, which consists of a magnetic component 100, in a schematic principle representation. In this exemplary embodiment, the additional component 2 is force-fittingly connected to the magnetic component 1 by being pressed onto the magnetic component 1, forming a press connection. The respective extent of the additional component 2 and the magnetic component 1 is coordinated with one another in such a way that the magnetic component 1 is arranged completely in a space radially between the additional component 2 and the axis of rotation D. Due to its hollow cylindrical basic shape, the magnetic component 1 only partially fills this space.The asymmetrical mass distribution of the additional component 2 for reducing the unbalance of the magnetic component 100 relative to the rotational axis D is produced by machining the additional component 2 on a radial outer surface in a partial area before and after connection to the magnetic component 1 subject to the unbalance.

[0056] Figure 6 shows a sixth exemplary embodiment of a magnetic assembly 10 according to the invention, which consists of a magnetic component 100, in a schematic basic representation. The additional component 2 has a projection on a radial outer surface pointing away from the magnetic component 1, whereby the asymmetrical mass distribution of the additional component 2 is produced. Before the additional component 2 was connected to the magnetic component 1, an imbalance of the magnetic component 1 was determined and the additional component 2 was selected depending on this determined imbalance. During connection, the additional component 2 was aligned as intended relative to the magnetic component 1 in such a way that the asymmetrical mass distribution of the additional component 2 at least partially compensates for the imbalance of the magnetic component 1 in order to reduce the unbalance of the magnetic component 100 relative to the axis of rotation D, which is generally advantageous.It is thus possible to determine a center of mass for the additional component 2 which is arranged at a distance from one side of the axis of rotation D on which the projection is formed, and to determine a center of mass for the mass of the magnetic component 1 which is arranged opposite the center of mass of the additional component 2 on one side of the axis of rotation D and at a distance from the axis of rotation D.

[0057] Figure 7 shows a seventh exemplary embodiment of a magnetic assembly 10 according to the invention, which comprises a shaft 3 in addition to a magnetic component 100. The magnetic component 1 is manufactured in such a way that it is injection-molded onto the shaft 3. The axis of rotation D, not shown, corresponds to the shaft axis of the shaft 3. The additional component 2 is manufactured in the manner of a ring, in this case made of copper, and has recesses through which sections of the magnetic component 1 run, which are fused to form holding sections 4 on the side of the additional component 2 facing axially away from the magnetic component 1. The additional component 2 is thus connected to the magnetic component 1 by fusing sections of the magnetic component 1, which is generally advantageous according to the invention.

[0058] Figure 8 shows an eighth embodiment of a magnet assembly 10 according to the invention, which comprises a magnet component 100 and a shaft 3. The magnet component 1 has a step at each of its axial ends, and the additional component 2 has two additional parts 21, 22, one of which is arranged on each of the steps. In the described embodiment, the connection between the respective additional part 21, 22 and the magnet component 1 is achieved in that, during the injection molding process by which the magnet component 1 is produced, the shaft 3 and the additional parts 21, 22 are inserted into the injection molding tool with which the magnet component 1 is produced. The additional parts 21, 22 each extend only over an angular section around the axis of rotation D, in the present case and generally advantageously according to the invention, each over an angular section of less than 90°.

[0059] Figure 9, comprising Figures 9a and 9b, shows two further embodiments of a magnet assembly 10 according to the invention with a magnet component 100 and a shaft 3. These two embodiments are similar in that the additional component 2 is arranged within a central region of the magnet component 1 relative to the axis of rotation D, which region is spaced from the respective axial end relative to the axis of rotation D by at least 10%, in particular at least 20% of the extension length of the magnet component 1 along the axis of rotation D. By arranging the additional component 2 in an axially central manner in this way, it is possible to compensate for imbalances in the magnet component 1 and / or the shaft 3 or their arrangement relative to one another, which imbalances are present in different axial sections of the magnet component 1, in a particularly simple manner.While in the embodiment according to Figure 9a the additional component 2 is ring-shaped and is arranged on an outer side of the magnetic component 1 in such a way that it protrudes from axially adjacent sections of the outer side of the magnetic component 1, in the embodiment according to Figure 9b the additional component 2 is flush with axially adjacent sections of the magnetic component 1.In the exemplary embodiment described here, although it can also be implemented differently, the additional component 2 is pushed onto the outside of the magnetic component 1 in a press fit during the production of the magnetic assembly 10 of the exemplary embodiment according to Figure 9a after the production of the magnetic component 1, whereas in the production of the exemplary embodiment according to Figure 9b it is inserted into the injection mold in which the magnetic component 1 is produced, so that directly during the production of the magnetic component 1, it is produced in a coherent connection with the additional component 2.

[0060] Figure 10 shows a tenth embodiment of a magnet assembly 10 according to the invention, which is designed in principle analogously to the embodiment according to Figure 3, but in addition to the magnet component 100 further comprises a shaft 3 which is firmly connected to the magnet component 100.

[0061] 11 to 14 show further exemplary embodiments of a magnetic assembly 10 according to the invention, in which the magnetic component 1 has a mass distribution that is deliberately asymmetrical to the axis of rotation D in that it has a projection that is primarily responsible for the asymmetry of the mass distribution, the additional component 2 being arranged relative to the axis of rotation D as a counterweight that compensates for the projection, which is generally advantageous in various exemplary embodiments according to the invention. The magnetic assembly 10 according to the exemplary embodiments of FIGS. 11 to 14 has, in addition to the magnetic component 100, a shaft 3 that is firmly connected to the magnetic component 100 and which, as is generally advantageous according to the invention, has a shaft axis that coincides with the axis of rotation D. The shaft 3 is generally advantageously designed to be substantially rotationally symmetrical about the axis of rotation D.In general, it is particularly advantageous if the additional component 2 or at least one of the additional parts 21, 22 of the additional component 2 is arranged in a recess in the magnetic component 1. This allows the magnetic assembly 10 to be designed to be particularly robust. In the exemplary embodiment according to Figure 11, the additional component 2 extends essentially over the entire axial extent of the magnetic component 1 and is arranged in a receptacle of the magnetic component on only one side, relative to the axis of rotation D, of the magnetic component 1. Unlike in the exemplary embodiment according to Figure 11, the additional component 2 in the exemplary embodiment according to Figure 12 extends only over less than 70%, in particular a maximum of 50%, of the axial extent of the magnetic component 1.In the present exemplary embodiment, it is generally preferred that the projection of the magnetic component 1 is provided in a first axial end section of the magnetic component 1, whereas the additional component 2 is arranged in the axial end section of the magnetic component 1 opposite the first axial end section along the axis of rotation D. In the exemplary embodiment according to Figure 13, the additional component 2, analogous to the exemplary embodiment according to Figure 12, is significantly shorter along the axis of rotation D than the axial extension length of the magnetic component 1, whereas, unlike in the exemplary embodiment according to Figure 12, it is arranged in the same axial end region of the magnetic component 1 in which the projection of the magnetic component 1 is also arranged.The projection of the magnetic component 1 and the additional component 2 are arranged on opposite sides with respect to the axis of rotation D, so that they each form opposite outer side sections of the magnetic component 100 with respect to the axis of rotation D. In the exemplary embodiment according to Figure 14, the additional component 2 of the magnetic component 100 of the magnetic assembly 10 has two additional parts 21, 22. The first additional part 21 is designed accordingly, as explained for the additional component 2 as a whole with reference to the exemplary embodiment according to Figure 13, and is also arranged corresponding to the projection formed by the magnetic component 1. The second additional part 22, in contrast, is annular on the axial end section of the magnetic component.

[0062] 1, which is opposite the axial end section with respect to the axis of rotation D, in which the projection and the first additional part 21 are provided. The second additional part 22 is annular in design, so that a further type of compensation for the imbalance of at least one component of the magnet assembly 10, in particular an imbalance of the magnet component 1, can be achieved by this second additional part 22.

[0063] Ma / rv 31 March 2023

[0064] Applicant:

[0065] Max Baermann Limited Liability Company

[0066] 51429 Bergisch Gladbach

[0067] Imbalance-minimized magnetic component

[0068] List of reference symbols 1 Magnetic component

[0069] 2 additional components

[0070] 11 first axial end section

[0071] 12 second axial end section

[0072] 21 first additional part 22 second additional part

[0073] 10 Magnet assembly

[0074] 100 magnetic components

[0075] D axis of rotation

Claims

Imbalance-minimized magnetic component Patent claims 1. Method for manufacturing a rotatable magnetic assembly (10) about an axis of rotation (D), in particular rotationally symmetrical about the axis of rotation (D), comprising a magnetic component (100) with a permanent magnetic component (1) and in particular a magnetic component (100) connected to the magnetic component (100) and extending along the axis of rotation (D) extending bushing and / or shaft (3) comprising the magnetic component (100) with the magnetic component (1) a connected non-magnetic additional component (2) comprising, wherein a value of an imbalance about the axis of rotation (D) of at least one component of the magnetic assembly (10) is determined and, in order to avoid an imbalance of the magnetic assembly (10), a mass distribution of the additional component about the axis of rotation (D) is determined (2) is adjusted depending on the determined value of the imbalance to compensate for this imbalance, wherein the additional component (2) is machined after connection with the magnetic component (1) depending on the determined value of the imbalance to adjust the mass distribution of the additional component (2) relative to the axis of rotation (D), characterized in that the magnetic component (1) is connected to the additional component (2) in such a way that both the additional component (2) and the magnetic component (1) each form a portion of a radial and an axial outer surface of the magnetic assembly (10), or that the additional component (2) is at least partially enclosed by the magnetic component (1) and an outer surface of the magnetic assembly (10) is formed at least section by the outer surface of the additional component (2).

2. The method according to claim 1, characterized in that - the measured value of the imbalance is compared with a predefined imbalance tolerance, and it is found that the measured value of the imbalance is outside the imbalance tolerance, - subsequently, after the magnetic component (1) has been connected to the additional component (2) and / or after the additional component (2) has been machined, a new value of the imbalance is determined and compared with the imbalance tolerance, whereby it is found that the new value of the imbalance is within the imbalance tolerance.

3. Method according to claim 1 or 2, characterized in that material of the additional component (2) is removed from an outer surface of the additional component (2) pointing away from the magnetic component (1), in particular by machining, to generate the set, in particular asymmetrical, mass distribution.

4. Method according to one of claims 1 to 3, characterized in that the magnetic component (1) is produced, in particular by means of an injection molding process, from a compound comprising magnetic particles and a polymeric carrier material in which the particles are embedded.

5. Method according to one of the preceding claims, characterized in that the magnetic component (1) is connected or is connected to the additional component (2) by injection molding, in particular such that the additional component (2) is accessible from an outside of the magnetic assembly (10).

6. Method according to claim 5, characterized in that the additional component (2) is connected to the magnetic component (1) as an insert in an injection molding tool.

7. Method according to one of the preceding claims, characterized in that the additional component (2) and the magnetic component (1) extend within the same axial section along the axis of rotation (D) or the additional component (2) is directly adjacent to the magnetic component (1) along the axis of rotation, wherein in particular the additional component (2) is connected to the magnetic component (1) by attachment to at least one axial end section (11, 12) of the magnetic component (1). (1) is connected or is connected.

8. Method according to one of the preceding claims, characterized in that the additional component (2) is formed or is formed from at least two separate additional parts (21, 22), of which in particular a first additional part (21) is attached to a first axial end section (11) of the magnetic component (1) and a second additional part (22) is attached to a second axial end section (12) of the magnetic component (1).

9. Method according to claim 8, characterized in that the imbalance of the magnet assembly (10) is avoided by the fact that - at least one, in particular both, of the additional parts (21, 22) has an asymmetrical mass distribution with respect to the axis of rotation (D) and is selected depending on the detected imbalance, and / or that - at least one, in particular both, of the additional parts (21, 22) is machined before and / or after its connection with the magnetic component (1) depending on the detected imbalance in order to adjust the mass distribution of the additional component (2) with respect to the axis of rotation (D).

10. Magnetic assembly (10) which is rotatable about an axis of rotation (D), in particular being rotationally symmetrical about the axis of rotation (D), comprising a magnetic component (100) which is a permanent magnetic a magnetic component (1), and in particular comprising a bushing and / or shaft (3) connected to the magnetic component (100) and extending along the axis of rotation (D), wherein the magnetic component (100) as a further component of the magnetic assembly (10) has a non-magnetic additional component (2) connected to the magnetic component (1), wherein the additional component (2) has a mass distribution relative to the axis of rotation (D) such that an imbalance of at least one other component of the magnetic assembly (10) is at least partially compensated, characterized in that the magnetic component (1) is connected to the additional component (2) in such a way that both the additional component (2) and the magnetic component (1) each form a portion of a radial and an axial outer surface of the magnetic assembly (10), or the additional component (2) is at least partially enclosed by the magnetic component (1) and the outer surface of the magnetic assembly (10) is formed at least section by the outer surface of the additional component (2).

11. Magnetic assembly (10) according to claim 10, characterized in that the additional component (2) is formed from at least two separate additional parts (21, 22), of which a first additional part (21) is attached to a first axial end section (11) of the magnetic component (1) and a second additional part (22) is attached to a second axial end section (12) of the magnetic component (1).

12. Magnetic assembly (10) according to claim 11, characterized in that the imbalance of at least one other component of the magnetic assembly (10) can be decomposed into at least a first partial imbalance of the first end section (11) and a second partial imbalance of the second end section (12), wherein - the first additional part (21) has a mass distribution adjusted with respect to the axis of rotation (D) such that the first partial imbalance is at least partially compensated, and / or - the second additional part (22) has a mass distribution set in relation to the axis of rotation (D) such that the second partial imbalance is at least partially compensated.

13. Magnetic assembly (10) according to one of claims 10 to 12, characterized in that the additional component (2) is made of a material which has a higher, in particular at least 1.5 times, in particular at least 2 times, in particular at least 2.5 times, density than a material from which the magnetic component (1) is made.

14. Magnetic assembly (10) according to one of claims 10 to 13, characterized in that the magnetic component (1) is produced, in particular by means of an injection molding process, from a compound comprising magnetic particles and a polymeric carrier material in which the particles are embedded, and / or that the additional component (2) , in particular at least one of its additional parts (21, 22) , is made of a non-magnetic, metal-containing material, in particular of a non-magnetic metal alloy comprising at least zinc and / or copper and / or is designed as stainless steel .

15. Magnetic assembly (10) according to one of claims 10 to 14, characterized in that the magnetic component (100) has an inhomogeneous mass distribution, wherein in particular a volume of the additional component (2) is less than 25%, in particular less than 15%, of a volume of the magnetic component (100) and / or a mass of the additional component (2) is at least 15%, in particular at least 20%, of a mass of the magnetic component (100).

16. Magnetic assembly (10) according to one of claims 10 to 15, characterized in that the additional component (2) is arranged radially spaced from the axis of rotation (D), wherein in particular the magnetic component (1) at least partially fills a space arranged radially between the additional component (2) and the axis of rotation (D).

17. Magnetic assembly (10) according to one of claims 10 to 16, characterized in that the magnetic component (1) is combined with the additional component (2) is connected in such a way that the additional component (2) forms at least a portion of a radial and / or axial outer surface of the magnetic component (100), wherein in particular the mass distribution of the additional component (2) is adjusted at least partially by machining the portion of the outer surface.

18. Magnetic assembly (10) according to one of claims 10 to 17, characterized in that the magnetic component (1) has an outer surface section which extends completely around the axis of rotation (D) with its circumferential length, wherein the additional component (2) extends along the outer surface section over at least 50%, in particular at least 70%, in particular at least 80% of the circumferential length around the axis of rotation, wherein in particular the magnetic component (1) has at least sectionally a basic shape in the form of a cylinder, the cylinder axis of which coincides with the axis of rotation (D) and the cylinder shell of which forms the outer surface section.

19. Magnetic assembly (10) according to one of claims 10 to 18, characterized in that the magnetic assembly (10) is designed to be rotationally symmetrical about the axis of rotation (D) over a section of its extension, in particular an uninterrupted section, wherein the section comprises at least 70%, in particular at least 80%, in particular at least 90% of the extension of the magnetic assembly (100).

20. Magnetic assembly (10) according to one of claims 10 to characterized in that the magnetic assembly (10) is designed as a fan wheel with fan wheel blades, wherein the fan wheel blades are formed by the magnetic component (1) and / or the additional component (2) and are evenly distributed around the axis of rotation (D).

21. Sensor arrangement comprising a first unit and a second unit rotatable relative to the first unit over an angle of rotation about an axis of rotation (D), wherein the first unit comprises a detector, characterized in that the second unit comprises a magnetic assembly (10) according to one of claims 10 to 20, wherein the detector is configured to generate a measurement signal dependent on a magnetic field of the magnetic component (100) of the magnetic assembly for determining the angle of rotation.

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