Method for hardening a bridge assembly of a rotating body

Abstract

The invention relates to a method for hardening a bridge assembly (10) of a rotating body (12) of an electric drive having a rotation axis (R), the method comprising at least steps for balancing and rotation hardening, the balancing comprising at least the steps of rotating the rotating body (12) about the rotation axis (R) at an imbalance-determining rotation speed (U) in order to detect an imbalance of the rotating body (12), determining the imbalance of the rotating body (12) (120), fastening at least one balancing weight to the rotating body or removing at least one balancing weight from the rotating body (12) at a stationary rotation speed (S) in order to compensate for the imbalance, the rotation hardening comprising at least the steps of rotating the rotating body (12) about the rotation axis (R) at a hardening rotation speed (V) having a magnitude greater than the magnitude of the imbalance-determining rotation speed (U). The invention also relates to a rotating body (12) manufactured by means of the method.

Description

Technical Field

[0001] The invention relates to a method for hardening a bridge component of a rotating body having a rotation axis of an electric drive.

[0002] The invention also relates to a rotating body manufactured by the steps of the method. Background Art

[0003] Particularly with the increasing electrification of vehicles, it is becoming increasingly important to continuously improve electric drive systems. This also means increasing the efficiency of electric drive systems, for example by reducing weight. It is also important to reduce the required installation space without sacrificing performance.

[0004] It can be expected that electrified vehicles will reach high numbers in the next few years and that the degree of mechatronics will increase significantly. Very different topologies are implemented for drive trains, which can be classified based on the installation position. For the constructive implementation of these drive trains, four collective categories are particularly important, namely hybrid modules for integration into internal combustion engine drive trains, dedicated hybrid transmissions for the targeted implementation of hybrid and electric drive modes, electric axle drives for dedicated hybrid drive trains and pure electric vehicles, and wheel hub drives for new mobility concepts. In principle, the use of electric machines is provided in particular with a rotor based on rotor laminations.

[0005] What all future axle concepts have in common is that they have a high degree of integration of mechanics and electrical / electronics. However, the requirements for the electric motor are different. For both hybrid modules and wheel hub motors, the axial installation space is limited. In addition, there is a direct coupling of the speed to the drive train, so that the power is adjusted in particular via the torque of the electric motor. In the case of electric axle drives, more axial installation space is available, but the diameter is generally limited due to the installation position. Preferably, the connection to the shaft is implemented via at least one gear stage in order to ensure the required starting torque. This makes it possible to increase the performance of the electric motor via higher speeds, which in turn enables a smaller, material-saving design. The same applies to most dedicated hybrid transmissions. In contrast, the power electronics are largely independent of the unit type; they are essentially defined by the voltage level, the amount of current required for maximum output and the unit-specific installation space. Summary of the invention

[0006] The object of the present invention is to create a method for hardening a bridge component of a rotating body having a rotation axis of an electric drive and a correspondingly produced rotating body which enable an improved rotating body to be achieved.

[0007] According to the invention, this object is achieved by a method for bridging a rotating body of an electric drive having a rotation axis and by a rotating body. Preferred embodiments of the invention are described in the following description, each of which may represent an aspect of the invention either individually or in combination.

[0008] According to the invention, therefore, a method for hardening a bridge assembly of a rotating body having a rotation axis of an electric drive is specified, the method having at least the steps for balancing and rotation hardening,

[0009] The balancing process includes at least the following steps:

[0010] rotating the rotating body about the rotation axis at an imbalance determining rotation speed so as to detect the imbalance of the rotating body,

[0011] Determine the imbalance of a rotating body,

[0012] fastening at least one balancing weight to the rotating body or removing it from the rotating body at a stationary rotational speed in order to compensate for the imbalance,

[0013] The rotation hardening process comprises at least the following steps:

[0014] The rotating body is rotated about the rotation axis at a hardening rotation speed, wherein the magnitude of the hardening rotation speed is greater than the magnitude of the imbalance determining rotation speed.

[0015] The method thus comprises two basic steps, namely balancing and spin hardening. The individual steps of balancing can be combined with the individual steps of spin hardening, particularly in their order, or can be performed in a different manner. It is essential that at some point in time each of these steps is performed on the rotating body so that the rotating body has a hardened bridge component.

[0016] As a result of rotational hardening, one or more bridge components for reliable operation of the rotating body can have a smaller material thickness in the radial extension than in the absence of rotational hardening. In other words, one or more bridge components of the rotating body can be made thinner in the radial direction. Rotational hardening increases the strength of the rotating body in the region of one or more bridge components, so that these bridge components have a higher fracture rotation speed and are therefore suitable for higher operating rotation speeds.

[0017] The term balancing refers to the reduction or elimination of imbalance. Every rigid body rotating about a fixed axis has imbalances that can cause vibrations or oscillations, noise, and increased wear and tear and even damage at high speeds.

[0018] When balancing a vehicle wheel, the balancing machine rotates the body. The shaft where this takes place is particularly equipped with sensors. The evaluation electronics calculate the imbalance from the measured values ​​of the forces occurring on the shaft. Balancing weights are then fastened to the rim to compensate for the imbalance. The preferred purpose of balancing is, on the one hand, to set the center of gravity of the wheel to be balanced so that the center of gravity falls on the axis of rotation and, on the other hand, so that the main inertia axis perpendicular to the rotating body not only intersects the axis of rotation but also lies on the axis of rotation. Therefore, the balancing weights can optionally be attached to both sides of the rim.

[0019] Balancing machines use rotational motion and dynamic force measurements on the axis of rotation to determine the mass, angle and side of the rotating body to which the balancing weight or counterweight is to be attached.

[0020] Fastening or removing a balancing weight on a rotating body is ultimately a process step considered under common technical considerations in which the mass distribution is adjusted so that the imbalance is compensated. This term can be specifically summarized as balancing.

[0021] Rotational hardening increases the strength of one or more bridging components. The strength of a material describes the ability to withstand mechanical loads before failure occurs and is specified as mechanical stress, i.e. force per cross-sectional area. High-strength materials can withstand higher stresses than low-strength materials. Failure can be an impermissible deformation, in particular plastic, i.e. permanent deformation or fracture. In the case of a rotating body within the meaning of the present invention, the fracture rotational speed is the point of such fracture. In this case, applying a hardening rotational speed to the rotating body leads to an increase in the strength of the material. This can preferably be achieved by means of an offset in the corresponding material, which is caused by the action of centrifugal forces.

[0022] Spin hardening is preferably not performed in an environment-specific manner, as the duration of exposure to the hardening spin speed, ambient temperature and / or ambient pressure has no significant effect. For example, applying the hardening spin speed to the rotating body for one second may be sufficient to cure the rotating body.

[0023] In the context of the present invention, rotational standstill is understood to mean a stationary rotational speed. In other words, the stationary rotational speed is zero.

[0024] According to the invention, a body of rotation manufactured by the steps of the method is also specified.

[0025] According to a preferred embodiment of the invention, it can be provided that the rotating body is a rotor lamination, a rotor lamination stack, a rotor or an electric machine. In the case of a rotor lamination, a rotor lamination stack or a rotor, these are themselves rotating elements. In the case of an electric machine, it is not the entire machine that rotates, but its rotor, so that an electric machine according to the teaching of the invention is also considered to be a rotating body.

[0026] Rotor laminations are also called electrical steel laminations. It is an important soft magnetic material element for the magnetic core. According to their properties, rotor laminations are divided into non-grain-oriented materials and grain-oriented materials. Non-grain-oriented materials are also called generator plates or motor plates according to their intended use, and grain-oriented materials are also called transformer plates or core plates. In a narrow sense, rotor laminations and rotor strips generally refer to cold-rolled strips made of iron-silicon alloys, and also refer to thin laminations cut or stamped from iron-silicon alloys, which are used to manufacture magnetic circuits for electric machines, that is, iron cores for generators, electric motors, transformers, relays, contactors, reactors, ignition coils, electric meters, and controllable deflection magnets.

[0027] The standards "Cold rolled non-grain oriented electrical steel sheets and strips in the final annealed state" (EN 10106) and "Grain oriented electrical steel sheets and strips in the final annealed state" (EN 10107) describe the magnetic, physical and other requirements for the materials. The applicable date of the standards is the earliest priority date of the present invention.

[0028] Rotor laminations as cores made of solid material are difficult to use in machines and transformers because eddy currents are generated under the influence of variable magnetic fields. Due to the increasing frequency of the eddy currents, the core often heats up instead of transmitting electrical energy. To avoid this, cores for electric machines are preferably specially designed as laminations that are stacked and insulated in piles or wound cut strip cores. The corresponding designs are also called laminations.

[0029] Soft magnetic materials form magnets under the influence of a magnetic field and largely return to a non-magnetic state when the field is turned off. Simple generator laminations can usually be used magnetically up to a maximum of 1.2 Tesla, equivalent to 12,000 Gauss. Advanced iron-silicon alloys enable flux densities up to around 1.75 Tesla.

[0030] The rotor laminations or the master core are preferably produced from stamped individual laminations.

[0031] If several rotor laminations are arranged one above the other, this arrangement is called a rotor lamination stack.

[0032] The rotor laminations can be insulated with a paper layer glued on one side. The rotor laminations can preferably be insulated by a chemically applied phosphide layer. The lamination thickness for normal applications is preferably 0.5 mm. For electrical transmitters with higher frequencies or especially low-loss devices, thinner laminations with a thickness of 0.35 mm can be used. Cut tape and ring cores are usually wrapped with thinner insulating tape.

[0033] The rotor is the rotating part of an electric machine or assembly. In particular, the rotor is used when there is a stator. In the case of a rotating electric machine, the entire rotating part of the machine is called the rotor, such as a squirrel cage rotor.

[0034] An electric machine is a machine used in electrical energy technology and represents a form of energy converter. A distinction is made between rotating electric machines, which include various types of electric motors and generators, and stationary electric machines including transformers. All electric machines have in common that they have a magnetic circuit in their structure, which is important for the functioning of the machine. In the context of the present invention, a rotating electric machine is a rotating body.

[0035] According to a preferred embodiment of the present invention, it can be provided that at least one bridge assembly is arranged on the outer circumference of at least one rotor lamination. Such a bridge assembly is arranged at this position in particular for efficient operation of the electric machine.

[0036] According to a preferred embodiment of the invention, it can be provided that the hardening rotational speed is set so that at least one bridging component of the rotating body has a plastic strain value of at least 0.2 percent after rotational hardening, the plastic strain being up to and including 1 percent, preferably 0.5 percent. The plastic strain value is an indication of a permanent relative change in length, i.e. extension or shortening, of the body under load, for example due to force or due to temperature changes, in particular thermal expansion. If the size of the body increases, this is a positive strain, so-called tension, otherwise it is a negative strain, so-called compression. It has been found that an advantageous hardening of the rotating body occurs at this level, which enables the bridging component to be compactly dimensioned.

[0037] According to a preferred embodiment of the invention, it can be provided that the hardening rotational speed is between the operating rotational speed of the rotating body and at least including and less than 10 percent, preferably at least including and less than 20 percent, of the fracture rotational speed of the rotating body. It has been found that by setting such a hardening rotational speed, an advantageous hardening of the rotating body occurs, which enables the bridge assembly to be compactly dimensioned.

[0038] According to a preferred embodiment of the invention, it can be provided that, after at least one balancing weight has been attached to or removed from the rotating body, the rotating body is further rotated about the rotation axis at an imbalance-determining rotation speed in order to detect an imbalance in the rotating body and preferably to repeat the balancing if necessary. This is a quality assurance measure for producing a reliably balanced rotating body. In particular, due to the additional stresses of rotation hardening, this may be a sensible measure for quality assurance.

[0039] According to a preferred embodiment of the present invention, the following steps are provided in sequence, namely:

[0040] First, the rotating body is rotated around the rotation axis at a hardening rotation speed, wherein the magnitude of the hardening rotation speed is greater than the magnitude of the imbalance determination rotation speed,

[0041] Then, the rotating body is rotated about the rotation axis of the rotating body at an imbalance determining rotation speed so as to detect imbalance of the rotating body, and optionally, between rotating the rotating body about the rotation axis at the hardening rotation speed and rotating the rotating body about the rotation axis of the rotating body at the imbalance determining rotation speed, the rotating body is stationary at a stationary rotation speed,

[0042] Then, determine the imbalance of the rotating body,

[0043] Then, at least one balancing weight is fastened to the rotating body or at least one balancing weight is removed from the rotating body at a stationary rotational speed in order to compensate for the imbalance,

[0044] Preferably, then, after at least one balancing weight has been attached to or removed from the rotating body, the rotating body is further rotated around the rotation axis at an unbalanced determining rotation speed in order to detect an imbalance in the rotating body, and preferably the balancing is repeated if necessary. The particular advantage of rotating the rotating body again is that any disturbance can be compensated by rotation hardening. If the rotating body is not stationary at a stationary rotation speed between the rotating body rotating around the rotation axis at the hardening rotation speed and the rotating body rotating around its rotation axis at the unbalanced determining rotation speed, the balancing of the rotating body can be performed immediately after its rotation hardening, so that the rotating body does not stop and does not dissipate the existing rotational kinetic energy, so that energy can therefore be saved. If the rotating body is stationary at a stationary rotation speed between the rotating body rotating around the rotation axis at the hardening rotation speed and the rotating body rotating around its rotation axis at the unbalanced determining rotation speed, the rotating body stops from its rotational motion after rotation hardening, i.e. stops to a stationary rotation speed that always corresponds to zero. Thereafter, the rotating body can be checked, for example, to ensure that it has no defects. The rotating body can be balanced at any later point in time. Thus, for example, a defective rotating body can be prevented from rotating about its axis of rotation at an imbalance-determining rotational speed, so that in this way the handling of defective components is avoided.

[0045] According to a preferred embodiment of the present invention, the following steps are provided in sequence, namely:

[0046] First, the rotating body is rotated about its rotation axis at an imbalance determination rotation speed so as to detect the imbalance of the rotating body.

[0047] Then, determine the imbalance of the rotating body,

[0048] Then, at least one balancing weight is fastened to the rotating body or at least one balancing weight is removed from the rotating body at a stationary rotational speed in order to compensate for the imbalance,

[0049] Then, the rotating body is rotated about the rotation axis at a hardening rotation speed, wherein the magnitude of the hardening rotation speed is greater than the magnitude of the imbalance determination rotation speed,

[0050] Preferably, then, after at least one balancing weight has been attached to or removed from the rotating body, the rotating body is further rotated about the rotation axis at the unbalance-determining rotation speed in order to detect an imbalance in the rotating body and preferably repeat the balancing if necessary. A particular advantage of rotating the rotating body again is that any disturbances can be compensated by rotation hardening. In addition, the rotating body can be rotated about the rotation axis again at the unbalance-determining rotation speed immediately after its rotation hardening, so that the rotating body does not stand still and does not dissipate the existing rotational kinetic energy, so that energy can therefore be saved.

[0051] According to a preferred embodiment of the present invention, the following steps are provided in sequence, namely:

[0052] First, the rotating body is rotated about its rotation axis at an imbalance determination rotation speed so as to detect the imbalance of the rotating body.

[0053] Then, determine the imbalance of the rotating body,

[0054] Then, at least one balancing weight is fastened to the rotating body or at least one balancing weight is removed from the rotating body at a stationary rotational speed in order to compensate for the imbalance,

[0055] Preferably, then, after the at least one balancing weight has been attached to or removed from the rotating body, the rotating body is further rotated about the rotation axis at the imbalance-determining rotation speed in order to detect an imbalance in the rotating body and preferably the balancing is repeated if necessary,

[0056] Then, preferably in the case of final assembly of the rotating body, the rotating body is rotated about the rotation axis at a hardening rotation speed, wherein the magnitude of the hardening rotation speed is greater than the magnitude of the imbalance-determining rotation speed. A particular advantage of rotating the rotating body again is that any disturbances can be compensated by spin hardening. According to this embodiment, a particular advantage is that spin hardening can also be carried out as the last method step in different manufacturing processes, for example as part of the final assembly of vehicle manufacturers. This means that they can carry out spin hardening according to their own requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In the following, the invention is described by way of example using preferred exemplary embodiments with reference to the accompanying drawings, wherein the features shown below may represent aspects of the invention both individually and in combination. In the drawings:

[0058] Figure 1: shows a partial view of a rotating body having at least one bridge component, which is hardened in particular according to the preferred measures of the invention,

[0059] Figure 2 :shows the Figure 1 but without any rotational hardening of at least one portion of the bridging component,

[0060] Figure 3 :shows the Figure 1 However, rotational hardening of at least one portion of the bridging component has occurred,

[0061] Figure 4 :shows the Figure 3 Diagram of the increased service life of the rotating body,

[0062] Figure 5 :shows the Figure 3 FIG. 1 is a diagram of a preferred method of manufacturing a rotating body,

[0063] Figure 6 :shows the Figure 3 FIG. 1 is a diagram of an alternative preferred method of manufacturing a rotating body,

[0064] Figure 7 :shows the Figure 3 FIG. 1 is a diagram of an alternative preferred method of manufacturing a rotating body, and

[0065] Figure 8 :shows the Figure 3 FIG. 1 is a diagram of an alternative preferred method of manufacturing a rotating body. DETAILED DESCRIPTION

[0066] Figures 5 to 8 Preferred measures of a method for hardening a bridge assembly 10 of a rotating body 12 having an axis of rotation R of an electric drive are respectively shown.

[0067] Figure 1 A portion of a rotor lamination as a rotating body 12 manufactured by the steps of the method is shown. Figure 1 Section A of a bridge assembly 10 comprising a rotating body 12 designed as a rotor stack.

[0068] Figure 2 An enlarged cross section of a bridge assembly 10 of a rotating body 12 designed as a rotor stack is shown. Figure 1 The cross section A of is similar. However, this rotor lamination is manufactured according to the prior art.

[0069] Figure 3 A bridge assembly 10 of a rotating body 12 designed as a rotor stack is shown, as shown in FIG. Figure 1The cross section A. The bridge assembly 10 designed as a rotating body 12 of a rotor stack is thus rotationally hardened.

[0070] Figure 2 and Figure 3 A comparison of the bridging assembly 10 is shown symbolically according to Figure 2 The bridging component 10 has the following features: Figure 3 The material thickness of the bridge assembly 10 is relatively large. Both bridge assemblies 10 have the same operating strength. That is, the two bridge assemblies have similar operating rotation speeds B and rupture rotation speeds BD. This is due to the fact that according to Figure 2 The bridge component 10 is not hardened, which is consistent with the Figure 3 The bridging component 10 is different.

[0071] according to Figure 2 The material thickness MS in the bridge component 10 is, for example, 0.9 mm. Figure 3 The material thickness MS in the bridge component 10 is, for example, 0.6 mm. Figure 3 In the case of the bridge assembly 10 of , the material thickness MS can preferably fluctuate between 0.5 mm and 0.8 mm inclusive. In particular, according to the teaching of the present invention, not only these values ​​can be protected in operational practice due to the particular reliability of said values ​​of the rotating body 12, but also the relationship or size of these quantities to each other, which can be derived respectively by simple calculation rules, can also be protected in operational practice.

[0072] according to Figure 3 A bridge assembly 10 having a material thickness MS of 0.6 mm without rotational hardening would lead to premature failure or rupture of the rotating body 12 when reaching the operating rotational speed B. Only rotational hardening enables operation of the more slender rotating body 12 at the previously known rotational speed D.

[0073] exist Figure 4 It is shown in Figure 3 The service life of the rotating body 12 is extended. Figure 4 A diagram with a horizontal axis representing the rotation speed D and two vertical axes is shown. The left vertical axis shows the transformed stress amplitude TS. The right vertical axis shows the equivalent plastic strain Figure 4 Two lines are shown. The upper line relates to the transformed stress amplitude TS. The lower line relates to the equivalent plastic strain The two lines each include three specific rotational speeds D, wherein the three specific rotational speeds are the same for the two lines. The specific rotational speeds D are indicated by dots.

[0074] exist Figure 4In the diagram, the point on the left may represent, for example, the operating rotational speed B. That is, the rotational speed of the rotor body 12 in its actual daily operation. The next point may be the so-called self-spin rotational speed SD. The self-spin rotational speed is typically 1.2 times the operating rotational speed B. Typically, the rotating body 12 or its rotating parts should be designed so that there is no visible change in the case of the self-spin rotational speed SD. The third point may be, for example, the rupture rotational speed BD. The rupture rotational speed is typically 1.4 times the operating rotational speed B. At least when the rupture rotational speed BD is reached, the motor should generally be able to withstand the load.

[0075] therefore, Figure 4 The effect of the hardening rotation speed V on the transformed stress amplitude TS and the equivalent plastic strain in the critical bridge component 10 of the rotating body 12 designed as a rotor plate with a constant material thickness MS of 0.6 mm is shown. As the plastic strain increases, the allowable equivalent transformation stress amplitude increases. Ultimately, this means that the service life of the rotor body 12 is extended.

[0076] As mentioned above, Figures 5 to 8 Preferred measures of a method for hardening a bridge assembly 10 of a rotating body 12 having an axis of rotation R of an electric drive are respectively disclosed.

[0077] The individual steps are represented symbolically in method phase VS.

[0078] In principle, according to Figures 5 to 8 The method comprises at least the steps of balancing and spin hardening,

[0079] The balancing process includes at least the following steps:

[0080] rotating the rotating body 12 about the rotation axis R at an imbalance determination rotation speed U 110 in order to detect the imbalance of the rotating body 12 ,

[0081] determining an imbalance 120 of the rotating body 12,

[0082] At least one balancing weight is fastened to the rotating body 12 or removed 130 from the rotating body at a stationary rotational speed S in order to compensate for the imbalance,

[0083] The rotation hardening process comprises at least the following steps:

[0084] The rotating body 12 is rotated 210 about the rotation axis R at a hardening rotation speed V, wherein the magnitude of the hardening rotation speed V is greater than the magnitude of the imbalance determining rotation speed U.

[0085] In essence, the rotating body 12 is provided as a rotor lamination, a rotor lamination stack, a rotor or an electric machine. Figure 1In particular, it can be provided that at least one bridge assembly 10 is arranged on the outer circumference of at least one rotor stack.

[0086] exist Figure 2 and Figure 3 It is schematically indicated that the hardening rotational speed V is set such that, for example, after rotational hardening, at least one bridge component 10 of the rotating body 12 has a strain value of 0.5 percent.

[0087] According to a preferred embodiment of the present invention, it can be set that the hardening rotational speed V is between the operating rotational speed B of the rotating body 12 and the fracture rotational speed BD of the rotating body 12 including at least and less than 10%, preferably including at least and less than 20%.

[0088] Preferably, it can be provided that, after at least one balancing weight has been attached to the rotating body 12 or removed 130 from the rotating body, the rotating body 12 is further rotated 140 around the rotation axis R at an imbalance determining rotation speed U in order to detect an imbalance in the rotating body 12 and preferably repeat the balancing if necessary.

[0089] according to Figure 5 The preferred sequence of the method steps can be designed as follows: First, the rotating body 12 is rotated 210 around the rotation axis R at a hardening rotation speed V, wherein the magnitude of the hardening rotation speed V is greater than the magnitude of the unbalance determination rotation speed U,

[0090] Then, the rotating body 12 is rotated 110 around the rotation axis R of the rotating body at an imbalance determination rotation speed U so as to detect the imbalance of the rotating body 12.

[0091] Then, the imbalance 120 of the rotating body 12 is determined,

[0092] Then, at least one balancing weight is fastened to the rotating body 12 or at least one balancing weight is removed 130 from the rotating body at a stationary rotation speed S in order to compensate for the imbalance,

[0093] Preferably, then, after at least one balancing weight has been attached to or removed 130 from the rotating body 12 , the rotating body 12 is further rotated 140 about the rotation axis R at the imbalance determining rotation speed U in order to detect an imbalance in the rotating body 12 and preferably repeat the balancing if necessary.

[0094] according to Figure 6 The preferred sequence of the method steps can be designed as follows: First, the rotating body 12 is rotated 210 around the rotation axis R at a hardening rotation speed V, wherein the magnitude of the hardening rotation speed V is greater than the magnitude of the unbalance determination rotation speed U,

[0095] Then, the rotating body 12 is rotated 110 around the rotation axis R of the rotating body at an imbalance determination rotation speed U so as to detect the imbalance of the rotating body 12.

[0096] The rotating body 12 is stationary at a stationary rotation speed S between the rotating body 12 rotating 210 around the rotation axis R at the hardening rotation speed V and the rotating body 12 rotating 110 around the rotation axis R at the unbalanced determination rotation speed U.

[0097] Then, the imbalance 120 of the rotating body 12 is determined,

[0098] Then, at least one balancing weight is fastened to the rotating body 12 or at least one balancing weight is removed 130 from the rotating body at a stationary rotation speed S in order to compensate for the imbalance,

[0099] Preferably, then, after at least one balancing weight has been attached to or removed 130 from the rotating body 12 , the rotating body 12 is further rotated 140 about the rotation axis R at the imbalance determining rotation speed U in order to detect an imbalance in the rotating body 12 and preferably repeat the balancing if necessary.

[0100] according to Figure 7 An alternative preferred sequence of the method steps can be designed as follows: first, the rotating body 12 is rotated 110 around the rotation axis R of the rotating body at an imbalance determination rotation speed U in order to detect the imbalance of the rotating body 12,

[0101] Then, the imbalance 120 of the rotating body 12 is determined,

[0102] Then, at least one balancing weight is fastened to the rotating body 12 or at least one balancing weight is removed 130 from the rotating body at a stationary rotation speed S in order to compensate for the imbalance,

[0103] Then, the rotating body 12 is rotated 210 around the rotation axis R at a hardening rotation speed V, wherein the magnitude of the hardening rotation speed V is greater than the magnitude of the imbalance determination rotation speed U,

[0104] Preferably, then, after at least one balancing weight has been attached to or removed 130 from the rotating body 12 , the rotating body 12 is further rotated 140 about the rotation axis R at the imbalance determining rotation speed U in order to detect an imbalance in the rotating body 12 and preferably repeat the balancing if necessary.

[0105] according to Figure 8The preferred sequence of the method steps can be designed as follows: first, the rotating body 12 is rotated 110 at an imbalance determination rotation speed U around the rotation axis R of the rotating body to detect the imbalance of the rotating body 12,

[0106] Then, the imbalance 120 of the rotating body 12 is determined,

[0107] Then, at least one balancing weight is fastened to the rotating body 12 or at least one balancing weight is removed 130 from the rotating body at a stationary rotation speed S in order to compensate for the imbalance,

[0108] Preferably, then, after at least one balancing weight has been attached to the rotating body 12 or removed 130 from the rotating body, the rotating body 12 is further rotated 140 about the rotation axis R at the imbalance-determining rotation speed U in order to detect an imbalance in the rotating body 12 and, preferably, to repeat the balancing if necessary,

[0109] Then, preferably when the rotating body 12 is finally assembled, the rotating body 12 is rotated 210 about the rotation axis R at a hardening rotation speed V, wherein the magnitude of the hardening rotation speed V is greater than the magnitude of the imbalance determination rotation speed U.

[0110] The hardening rotational speed V is, for example, between 16,000 and 22,000 revolutions per minute inclusive. The hardening rotational speed V is preferably 20,000 revolutions per minute. Deviations of up to 10 percent can be provided in each case.

[0111] For example, independently of the aforementioned values ​​or also depending on the aforementioned values, the rupture rotation speed BD can be between 23,000 rpm and 27,000 rpm, inclusive. Independent of the aforementioned figures or also depending on the aforementioned figures, the rupture rotation speed BD is preferably 25,000 rpm. In each case, a deviation of up to 10 percent can be provided.

[0112] For example, independently or also depending on the aforementioned values, the operating rotational speed B may be between 400 rpm and 1000 rpm, inclusive. Independently or also depending on the aforementioned figures, the operating rotational speed B is preferably 500 rpm. In each case, a deviation of up to 10 percent can be provided.

[0113] For example, the unbalance determination rotation speed U may correspond to the operation rotation speed B, particularly with a deviation of 10 percent inclusive, but is not limited thereto.

[0114] The rotating body 12 regulated according to the teachings of the present invention can be operated in normal operating practice 300 at an operating rotational speed B without premature material failure due to rotational hardening, wherein the material thickness MS of the bridging device 10 of the rotating body is small in the radial direction relative to the rotational axis R.

[0115] Here, normal operating practice 300 means the daily use of the rotating body 12 according to its actual purpose. Figures 5 to 8 conduct.

[0116] Description of Reference Numerals

[0117] 10. Bridge assembly of rotating body

[0118] 12 Rotating body

[0119] 110 The rotating body is rotated around the rotation axis of the rotating body at an unbalanced determined rotation speed

[0120] 120 Determining the imbalance of a rotating body

[0121] 130 Fastening at least one balancing weight to the rotating body or removing at least one balancing weight from the rotating body at a stationary rotation speed 140 The rotating body is further rotated around the rotation axis at an unbalanced determined rotation speed

[0122] 210 rotating the rotating body at a set rotation speed around the rotation axis of the rotating body

[0123] 300 General Operation Practice

[0124] R Rotation axis

[0125] U Unbalance determines the rotation speed

[0126] S Static rotation speed

[0127] V Hardening rotation speed

[0128] B Operating rotation speed

[0129] BD rupture rotation speed

[0130] A is a cross section of the bridge assembly of the rotating body of the rotor stack. MS Material Thickness D Rotation speed Equivalent plastic strain TS Transformed stress amplitude SD Spin Rotation Speed VS method stage.

Claims

1. A method for hardening a bridge assembly (10) of a rotating body (12) of an electric drive having an axis of rotation (R), the method comprising at least the steps of balancing and rotation hardening, The balancing step comprises at least the following steps: - rotating (110) the rotating body (12) about a rotation axis (R) at an imbalance-determining rotation speed (U) in order to detect an imbalance of the rotating body (12), - determining an imbalance (120) of the rotating body (12), - fastening at least one balancing weight to the rotating body (12) or removing (130) at least one balancing weight from the rotating body at a stationary rotation speed (S) in order to compensate for an imbalance, The rotation hardening comprises at least the following steps: - rotating (210) the rotating body (12) about the rotation axis (R) at a hardening rotation speed (V), wherein: The magnitude of the hardening rotational speed (V) is greater than the magnitude of the imbalance determining rotational speed (U), wherein the rotating body (12) is a rotor lamination, a rotor lamination stack, a rotor or a motor, wherein at least one bridge assembly (10) is arranged on the outer periphery of at least one rotor lamination, wherein the hardening rotational speed (V) is set so that at least one bridge assembly (10) of the rotating body (12) has a strain measurement value from 0.2 percent to 1 percent after rotational hardening.

2. The method according to claim 1, characterized in that The strain measurement was 0.5 percent.

3. The method according to claim 1 or 2, characterized in that: The hardening rotational speed (V) is between the operating rotational speed (B) of the rotating body (12) and the fracture rotational speed (BD) of the rotating body (12) including at least and less than 10 percent.

4. The method according to claim 1 or 2, characterized in that: The hardening rotational speed (V) is between the operating rotational speed (B) of the rotating body (12) and the fracture rotational speed (BD) of the rotating body (12) including at least and less than 20 percent.

5. The method according to claim 1 or 2, characterized in that: - after the at least one balancing weight has been attached to the rotating body (12) or removed from the rotating body (130), further rotating (140) the rotating body (12) around the rotation axis (R) at the imbalance determining rotation speed (U) in order to detect an imbalance in the rotating body (12) and to repeat balancing if necessary.

6. The method according to claim 1 or 2, characterized in that: The following steps are in order: - first, rotating (210) the rotating body (12) around the rotation axis (R) at the hardening rotation speed (V), wherein the magnitude of the hardening rotation speed (V) is greater than the magnitude of the imbalance determining rotation speed (U), - then, rotating (110) the rotating body (12) around its rotation axis (R) at the imbalance determining rotation speed (U) in order to detect the imbalance of the rotating body (12), wherein, optionally, between rotating (210) the rotating body (12) around its rotation axis (R) at the hardening rotation speed (V) and rotating (110) the rotating body (12) around its rotation axis (R) at the imbalance determining rotation speed (U), the rotating body (12) is stationary at the stationary rotation speed (S), - then, determining the imbalance (120) of the rotating body (12), - Then, at least one balancing weight is fastened to the rotating body (12) or at least one balancing weight is removed (130) from the rotating body at the stationary rotation speed (S) in order to compensate for the imbalance.

7. The method according to claim 6, characterized in that - Then, after the at least one balancing weight has been attached to the rotating body (12) or removed from the rotating body (130), the rotating body (12) is further rotated (140) about the rotation axis (R) at the imbalance determining rotation speed (U) in order to detect an imbalance in the rotating body (12) and, if necessary, repeat the balancing.

8. The method according to claim 1 or 2, characterized in that: The following steps are in order: - first, rotating (110) the rotating body (12) around its rotation axis (R) at the imbalance determining rotation speed (U) in order to detect the imbalance of the rotating body (12), - then, determining the imbalance (120) of the rotating body (12), - then, at the stationary rotational speed (S), at least one balancing weight is fastened to the rotating body (12) or at least one balancing weight is removed (130) from the rotating body in order to compensate for the imbalance, - Then, the rotating body (12) is rotated (210) about the rotation axis (R) at the hardening rotation speed (V), wherein the magnitude of the hardening rotation speed (V) is greater than the magnitude of the imbalance determining rotation speed (U).

9. The method according to claim 8, characterized in that - Then, after the at least one balancing weight has been attached to the rotating body (12) or removed from the rotating body (130), the rotating body (12) is further rotated (140) about the rotation axis (R) at the imbalance determining rotation speed (U) in order to detect an imbalance in the rotating body (12) and, if necessary, repeat the balancing.

10. The method according to claim 1 or 2, characterized in that: The following steps are in order: - first, rotating (110) the rotating body (12) around its rotation axis (R) at the imbalance determining rotation speed (U) in order to detect the imbalance of the rotating body (12), - then, determining the imbalance (120) of the rotating body (12), - then, at the stationary rotational speed (S), at least one balancing weight is fastened to the rotating body (12) or at least one balancing weight is removed (130) from the rotating body in order to compensate for the imbalance, - Then, the rotating body (12) is rotated (210) about the rotation axis (R) at the hardening rotation speed (V), wherein the magnitude of the hardening rotation speed (V) is greater than the magnitude of the imbalance determining rotation speed (U).

11. The method according to claim 10, characterized in that In the case of final assembly of the rotating body (12), the rotating body (12) is rotated (210) about the rotation axis (R) at the hardening rotation speed (V).

12. The method according to claim 1 or 2, characterized in that: The following steps are in order: - first, rotating (110) the rotating body (12) around its rotation axis (R) at the imbalance determining rotation speed (U) in order to detect the imbalance of the rotating body (12), - then, determining the imbalance (120) of the rotating body (12), - then, at the stationary rotational speed (S), at least one balancing weight is fastened to the rotating body (12) or at least one balancing weight is removed (130) from the rotating body in order to compensate for the imbalance, - after the at least one balancing weight has been attached to or removed from the rotating body (12) (130), the rotating body (12) is further rotated (140) about the rotation axis (R) at the imbalance-determining rotation speed (U) in order to detect an imbalance in the rotating body (12) and, if necessary, to repeat the balancing, - Then, the rotating body (12) is rotated (210) about the rotation axis (R) at the hardening rotation speed (V), wherein the magnitude of the hardening rotation speed (V) is greater than the magnitude of the imbalance determining rotation speed (U).

13. The method according to claim 12, characterized in that In the case of final assembly of the rotating body (12), the rotating body (12) is rotated (210) about the rotation axis (R) at the hardening rotation speed (V).

14. A rotating body (12), characterized in that: The rotating body is manufactured by the method according to any one of claims 1 to 13.

Images