Rotor for an electric machine

Abstract

The invention relates to a rotor (R) for an electric machine, wherein the rotor (R) has a plurality of annularly configured lamination stack segments (BS) which are arranged in succession in the longitudinal direction of the rotor (R), and each lamination stack segment (BS) has at least one recess (7) and a pole component (PK) arranged therein, wherein the pole components (PK) arranged in succession in the longitudinal direction of the rotor (R) form a pole assembly (PBG), and the pole assembly (PBG) has a zigzag course with respect to its longitudinal direction.

Description

Technical Field

[0001] The present invention relates to a rotor for an electric machine, wherein the rotor comprises at least one pole assembly consisting of a plurality of pole parts, and the pole parts have a serrated inclination with respect to the longitudinal direction of the rotor. Furthermore, the present invention relates to an electric machine having a rotor according to the present invention and a motor vehicle having an electric machine according to the present invention. Background Art

[0002] Rotor for an electric machine is known in principle. Known rotors typically have a plurality of stack segment parts arranged in sequence along the longitudinal direction of the rotor. Accommodation parts and / or recesses for accommodating pole parts are constructed within the stack segment parts. It is also known that the stack segment parts are arranged such that the stack segment parts are arranged and / or constructed offset from each other in the circumferential direction, such that the pole parts of the pole assembly, for example, have a linear inclination in the circumferential direction of the rotor. However, the linear inclination is not optimal for every electric machine and can have a negative impact on the vibration and / or noise characteristics of the electric machine. Summary of the Invention

[0003] The object of the present invention is to provide a rotor for an electric machine with which the vibration and / or noise formation of the electric machine can be reduced.

[0004] This object is solved by the subject matter of claim 1. Preferred developments of the present invention are described in the dependent claims, the description and the drawings, wherein each feature can represent an aspect of the present invention not only individually but also in combination.

[0005] According to the present invention, there is provided a rotor for an electric machine, which has a plurality of annularly configured stack segment parts arranged in sequence along the longitudinal direction of the rotor, wherein each stack segment part has at least one recess and a pole part arranged therein, the pole part includes a side surface parallel to the longitudinal direction of the rotor, wherein the pole parts arranged in sequence along the longitudinal direction of the rotor form a pole assembly, and the pole assembly has a first subgroup and a second subgroup adjacent to the first subgroup in the axial direction of the motor, the first subgroup includes at least three parts, and the second subgroup has pole parts, the stack segment parts are arranged offset from each other in the circumferential direction such that the pole parts of the first subgroup are arranged offset from each other in a first direction, wherein the side surfaces of the pole parts of the first subgroup have an offset from each other such that all the pole parts of the first subgroup occupy different offset positions, and the pole parts of the second subgroup have offset positions between the offset positions of the pole parts of the first subgroup, and the first subgroup has a maximum distance and a minimum distance from the pole parts of the second subgroup in the axial direction of the rotor.

[0006] In other words, an aspect of the present invention is to provide a rotor for an electric machine, which has a plurality of laminated stack sections with an annular configuration, and the laminated stack sections are arranged in sequence along the axial direction of the rotor. The corresponding laminated stack sections generally have a plurality of laminated disks, which are identical within the laminated stack sections and are combined into or connected to each other to form the laminated stack sections.

[0007] Each laminated stack section has at least one recess and a pole component arranged therein. Generally, each laminated stack has a plurality of recesses spaced apart from each other in the circumferential direction, and a pole component is arranged in each recess. The pole component can also be referred to as a magnet or especially a permanent magnet.

[0008] The pole components arranged in the corresponding laminated stack sections have side surfaces in a direction parallel to the longitudinal direction of the rotor. Depending on the configuration or arrangement of the recesses in the corresponding laminated stack sections, the side surfaces are preferably oriented in the tangential direction or the circumferential direction of the laminated stack section. The pole components arranged in sequence along the longitudinal direction of the rotor form a pole assembly. The pole assembly includes a first subgroup and a second subgroup adjacent to the first subgroup in the axial direction of the motor. It is provided here that the first subgroup includes at least three pole components. In other words, the first subgroup can have, for example, three, four, five, six, seven or more pole components. The second subgroup has only one pole component.

[0009] The pole components of the first subgroup are arranged offset from each other in a first direction, such that the side surfaces of the pole components of the first subgroup have an offset from each other, so that all the pole components of the first subgroup occupy different offset positions. It is correspondingly provided that the pole components of the first subgroup are twisted with respect to each other in a first direction or a first rotation direction of the laminated stack section, such that they have a linear inclination in the first subgroup.

[0010] The pole component of the second subgroup has an offset position between the offset positions of the pole components of the first subgroup, where the first subgroup has a maximum distance and a minimum distance from the pole component of the second subgroup in the axial direction of the rotor. In other words, the offset position of the pole component of the second subgroup is located between the corresponding offset positions of the pole components arranged in the first subgroup, which have a maximum distance from the pole component of the second subgroup in the axial direction of the rotor and a minimum distance from the pole component of the second subgroup in the axial direction of the rotor. Therefore, a rotor for an electric machine is provided, in which the inclination of the pole components of the pole assembly is configured as a sawtooth shape.

[0011] The rotor is typically rotatably supported and arranged at a distance from the stator surrounding the rotor through an air gap. In this air gap, there is a force distribution related to time and position in the radial, tangential, and axial directions. This force distribution is significantly affected by the structure of the rotor and can excite the stator, resulting in vibration and / or noise formation. A rotor with a toothed inclined portion of a lamination stack section or pole components arranged therein can reduce the influence of the axial, radial, and tangential forces acting on the stator, thus positively affecting the noise and vibration conditions of the stator or the motor.

[0012] An advantageous expansion of the present invention is that all the offset positions of the pole components within the pole assembly are different from each other. This means that the offset positions of the pole components of the second subgroup are different from the offset positions of the pole components of the first subgroup, and they are also all different from each other. However, it is not provided that the pole components of the second subgroup are linearly continuously inclined with respect to the pole components of the first subgroup, but are staggered in a second direction opposite to the first direction.

[0013] Alternatively, an advantageous expansion of the present invention is that the offset positions of the pole components of the second subgroup correspond to the offset positions of the pole components of the first subgroup, where the pole components of the first subgroup (whose offset positions are the same as those of the pole components of the second subgroup) are between the pole components of the first subgroup, and this first subgroup has a maximum distance and a minimum distance along the axial direction of the rotor with respect to the pole components of the second subgroup. Thus, it is provided that the offset position of the pole component of the second subgroup is not equal to the offset position of the first pole component that is farthest from the pole components of the second subgroup, and is not equal to the offset position of the pole component of the first subgroup that is arranged closest to the pole components of the second subgroup.

[0014] In principle, in the expansion of the present invention, it can be provided that the offsets between the sides of the pole components of the first subgroup are of the same magnitude. In this way, the inclined portion of the pole components of the first subgroup is described, where the offset angle between consecutive pole components or lamination sections of the rotor of the first subgroup is the same.

[0015] An advantageous expansion of the present invention is that the offsets between the sides of the pole components of the first subgroup are different from each other. In other words, it can be provided that the first offset between the sides of two consecutive pole components of the first subgroup is greater than the second offset between two consecutive pole components of the first subgroup.

[0016] Another preferred embodiment of the present invention is that the rotor has a plurality of first subgroups, which are arranged in sequence along the axial direction of the rotor. In other words, it can be provided that the rotor has two first subgroups arranged in sequence, where the offset positions of the corresponding pole components of consecutive first subgroups are the same.

[0017] Finally, a preferred embodiment of the present invention is that the rotor has a plurality of pole assemblies spaced apart from each other in the circumferential direction. In other words, the rotor can include two, three, four, five or more pole assemblies. Here, the pole assemblies are arranged spaced apart from each other in the circumferential direction.

[0018] The invention also relates to an electric machine having a rotor according to the invention.

[0019] Furthermore, the invention relates to a motor vehicle having an electric machine according to the invention.

[0020] Other features are derived from the dependent claims and the following examples. The examples should not be understood as limiting, but rather as illustrative. They should enable a person skilled in the art to implement the invention. The applicant reserves the possibility of making one or more of the features disclosed in several embodiments the subject of a claim, or of accommodating these features in existing claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] An embodiment is described in detail with reference to the accompanying drawings. In them:

[0022] Figure 1 A three-dimensional view of a rotor according to a preferred embodiment of the present invention is shown;

[0023] Figure 2 A top view of a lamination stack section of a rotor according to an embodiment of the present invention is shown;

[0024] Figures 3 to 6 Different exemplary embodiments of the arrangement of pole parts within a laminated core section of a rotor are shown. DETAILED DESCRIPTION

[0025] Figure 1 1 shows a three-dimensional view of a rotor R for an electric machine. The rotor R has a plurality of annularly configured laminated core sections BS, which are arranged one behind the other in the longitudinal direction of the rotor R. Each laminated core section BS has at least one recess T and a pole part PK arranged therein. The pole part PK can also be referred to as a magnet, in particular a permanent magnet.

[0026] In the present embodiment, the laminated core section BS has a plurality of recesses T arranged spaced apart from one another in the circumferential direction, wherein the recesses T have rectangular openings with a straight course in the tangential direction of the laminated core section BS. In principle, the recesses T can also be constructed and / or arranged in a V-shaped manner, which is exemplified in Figure 2 Shown in.

[0027] refer to Figure 1In the illustrated embodiment, the pole member PK has an outer side AS in the radial direction of the rotor R. Parallel to the longitudinal direction of the rotor R, the pole member PK has a side face SF. The pole members PK arranged in succession in the longitudinal direction of the rotor R form a pole assembly PBG.

[0028] The pole assembly PBG includes a plurality of first subgroups U1, which are arranged in succession in the axial direction of the rotor R. Each subgroup U1 has at least three pole members PK. A second subgroup U2, which is arranged adjacent to the subgroup U1 in the axial direction of the rotor R, has only one pole member PK. The pole members PK of the first subgroup U1 and the second subgroup U2 are arranged relative to one another such that the pole assembly PBG has a zigzag course in its longitudinal extent or in the longitudinal direction of the rotor R. By means of the zigzag course, the influence of axial, tangential and / or radial forces acting in the stator during rotation of the rotor R about its longitudinal axis can be reduced, such that the formation of noise and / or vibrations in the stator can be reduced.

[0029] Figures 3 to 6 Different design variants of the arrangement of the pole members PK within the pole assembly PBG for different numbers of lamination stack segments BS are shown. Figures 3 to 6 The illustration is restricted to showing the arrangement of the pole members PK. The rotor R or the lamination stack segments BS are not shown Figures 3 to 6 therein.

[0030] Figure 3 The pole assembly PBG according to a preferred first embodiment of the invention is shown therein. The rotor R of this embodiment includes four lamination stack segments BS arranged in succession in the longitudinal direction of the rotor. Accordingly, the pole assembly PBG includes four pole members PK arranged in succession in the longitudinal direction of the pole assembly PBG. Here, the pole assembly PBG has a first subgroup U1 and a second subgroup U2 adjacent to the first subgroup U1. The pole members PK of the first subgroup U1 are arranged offset from one another in a first direction R1 such that the side faces SF of the pole members PK of the first subgroup U1 have an offset V1 from one another, such that all the pole members PK of the first subgroup U1 occupy different offset positions. The pole member PK of the second subgroup U2 has an offset position between the offset positions of the pole members PK of the first subgroup U1, which first subgroup has a maximum distance and a minimum distance from the pole member PK of the second subgroup U2 in the axial direction of the rotor R. In other words, the pole member PK of the second subgroup U2 has an offset position between the offset positions of the pole members PK of the first subgroup U1, which first subgroup has, on the one hand, a maximum distance from the pole member PK of the second subgroup U2 in the axial direction of the rotor R and, on the other hand, a minimum distance from the pole member PK of the second subgroup U2 in the axial direction of the rotor R.

[0031] Furthermore, it is provided that all the offset positions of the pole components PK within the pole assembly PBG are different from each other. In other words, the offset positions of the pole components PK of the second subgroup U2 do not correspond to the offset positions of the pole components PK of the first subgroup U1.

[0032] Figure 4 A second embodiment of the pole assembly PBG is shown. Different from Figure 3 the example shown, the offset positions of the pole components PK of the second subgroup U2 are equal to the offset positions of the pole components PK of the first subgroup U1. Here, it is provided that the pole components PK of the first subgroup U1 (whose offset positions are the same as those of the pole components PK of the second subgroup U2) are located between the pole components PK of the first subgroup U1. The first subgroup has a maximum distance from the pole components PK of the second subgroup U2 in the axial direction of the rotor R on the one hand, and a minimum distance from the pole components PK of the second subgroup U2 in the axial direction of the rotor R on the other hand.

[0033] Figure 5 and 6 shows the pole assembly PBG of a rotor R having seven lamination stack segments BS.

[0034] In Figure 5 the embodiment shown, the pole assembly PBG has two successively arranged first subgroups U1. The subgroups U1 are arranged successively in the axial direction of the rotor. The subgroup U2 is arranged adjacent to the subgroup U1. The two subgroups U1 are constructed identically to each other. In other words, the corresponding subgroups U1 have the same offset positions. However, within the first subgroup U1, the pole components PK are arranged offset from each other such that the pole components PK have an offset V1 from each other. The pole components PK are arranged offset from each other in a first direction R1. Thus, the pole components PK have a linear orientation within the first subgroup.

[0035] The offset positions of the pole components PK of the second subgroup U2 do not correspond to the offset positions of the pole components PK of the first subgroup U1. Overall, the pole assembly PBG according to the third embodiment has a total of four different offset positions.

[0036] Figure 6 A pole assembly PBG according to a fourth embodiment is shown, where different from Figure 5 the case, the offset positions of the pole components PK of the second subgroup U2 are the same as those of the pole components PK of the first subgroup U1, which is also described and shown in Figure 4 for example. Thus, a zigzag orientation of the pole assembly PBG in the axial direction is shown, where the rotor R has a reduced number of lamination stack cross-sections because the number of offset positions of the pole components PK of the pole assembly PBG is reduced. The rotor R constructed in this way has proven to be particularly advantageous for reducing noise and vibration problems.

[0037] In the fourth embodiment, the offset V1 of the corresponding pole members PK of the first subgroup U1 relative to each other is 2.887°. This means that the successive pole members PK within the first subgroup U1 respectively have an offset of 2.887°. The offset positions of the pole members PK of the other first subgroup U1 adjacent to the first subgroup U1 correspond to the offset positions of the first subgroup U1. Therefore, these successive pole members PK of the other first subgroup U1 also have an offset of 2.887° in the first direction R1. Starting from the maximum offset of the first subgroup U1, i.e., the sum of the offsets V1 of the corresponding pole members PK of the first subgroup U1, the pole members PK of the second subgroup U2 are arranged with an offset of 2.887° in the second direction R2 opposite to the first direction R1.

Claims

1. Rotor (R) for an electric machine, having a plurality of laminated stack sections (BS) of annular configuration, which are arranged successively in the longitudinal direction of the rotor (R), where each laminated stack section (BS) has at least one recess (T) and a pole component (PK) arranged therein, which pole component includes a lateral face (SF) parallel to the longitudinal direction of the rotor (R), where the pole components (PK) arranged successively in the longitudinal direction of the rotor (R) form a pole assembly (PBG), and the pole assembly (PBG) has a plurality of first subgroups (U1) and a second subgroup (U2) adjacent to one of the plurality of first subgroups (U1) in the axial direction of the motor, each of the plurality of first subgroups (U1) has at least three pole components (PK) arranged continuously in the axial direction of the rotor, and the plurality of first subgroups (U1) are identical to one another, and the second subgroup (U2) has pole components (PK), the laminated stack sections (BS) are arranged offset from one another in the circumferential direction such that the pole components (PK) of each of the plurality of first subgroups (U1) are arranged offset from one another in a first direction (R1), where the lateral faces (SF) of the pole components (PK) of each of the plurality of first subgroups (U1) have an offset (V1) from one another such that all the pole components (PK) of each of the plurality of first subgroups occupy different offset positions, and the offset (V1) between the lateral faces (SF) of the pole components (PK) of each of the plurality of first subgroups (U1) is of the same magnitude, and the pole components (PK) of the second subgroup (U2) have an offset position between the offset positions of two pole components (PK) of each of the plurality of first subgroups (U1), and the two pole components (PK) of each of the plurality of first subgroups have a maximum distance and a minimum distance from the pole components (PK) of the second subgroup (U2) in the axial direction of the rotor (R).

2. Rotor (R) according to claim 1, wherein all the offset positions of the pole components (PK) within the pole assembly (PBG) are different from one another.

3. Rotor (R) according to claim 1, wherein the offset positions of the pole components (PK) of the second subgroup (U2) correspond to the offset positions of the pole components (PK) of the plurality of first subgroups (U1), and the pole components (PK) of the plurality of first subgroups (U1) whose offset positions are the same as those of the pole components (PK) of the second subgroup (U2) are located between the pole components (PK) of the plurality of first subgroups (U1), and the plurality of first subgroups have a maximum distance and a minimum distance from the pole components (PK) of the second subgroup (U2) in the axial direction of the rotor (R).

4. The rotor (R) according to any one of claims 1 to 3, characterized in that, The rotor (R) has a plurality of pole assemblies (PBG) spaced apart from one another in the circumferential direction.

5. Electric machine, having a rotor (R) according to any one of claims 1 to 4.

6. Motor vehicle, having an electric machine according to claim 5.

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