STATOR OF AN ELECTRICAL MACHINE

Description

State of the art

[0001] The invention is based on a stator of an electrical machine according to the preamble of claim 1.

[0002] A stator of an electrical machine is already known from US2012256512 A1, comprising a stator laminated core having a stator axis, which comprises a plurality of stator teeth and a plurality of stator slots formed between the stator teeth and is formed by a plurality of stacked stator laminations, and comprising electrical conductor elements which run through the stator slots of the stator laminated core and are provided for forming an electrical winding, in particular a plug-in winding, wherein a slot insulation, in particular a slot insulation paper, is provided in each of the stator slots for electrically insulating the conductor elements from the stator laminated core, wherein the stator laminations each have a plurality of lamination teeth and each have a lamination yoke connecting the lamination teeth, wherein the stator teeth of the stator laminated core are each formed by stacked lamination teeth of the stator laminations.

[0003] In the stator slots, a gap forms between the conductor elements and the stator lamination stack, or between the conductor elements and the respective slot insulation. This gap depends, among other things, on the manufacturing tolerance of the width of the stator slots and the manufacturing tolerance of the width of the conductor elements. This gap, which is an air gap, possibly filled with an impregnating agent, impairs the heat transfer from the conductor elements to the stator lamination stack.

[0004] The features of the preamble of claim 1 emerge from WO 2019 142 663 A1. Advantages of the invention

[0005] The stator of the electrical machine according to the invention with the characterizing features of the main claim has the advantage that the heat transfer from the conductor elements to the stator core, and thus the cooling of the electrical winding, is improved. As a result, the performance of the electrical machine can be increased. Furthermore, the mechanical fixation of the conductor elements in the stator slot is also improved, so that impregnation of the conductor elements in the stator slot could be eliminated. Furthermore, the manufacturing tolerances for the stator laminations and for the conductor elements can be expanded, thus reducing the manufacturing costs for the stator.

[0006] These advantages are achieved by a stator according to claim 1. According to the invention, at least one stator lamination is provided in the stator core, which is rotated in the circumferential direction relative to the stator axis relative to other stator laminations of the stator core such that, in each stator slot of the stator core, it protrudes into the respective stator slot with a lamination tooth section of one of the lamination teeth. The protruding lamination tooth sections form protruding ribs in the stator slots, which have no or only a small gap to the conductor elements.

[0007] The measures listed in the subclaims enable advantageous further developments and improvements of the stator specified in the main claim.

[0008] It is advantageous that the respective twisted stator lamination in each stator slot protrudes into the respective stator slot with the laminar tooth section on one of the two stator teeth delimiting the respective stator slot and that a depression with a negative contour corresponding to the protruding laminar tooth section is formed on the other stator tooth delimiting the respective stator slot.

[0009] According to the invention, several stator laminations in the stator lamination stack are rotated in the circumferential direction relative to the stator axis relative to other stator laminations of the stator lamination stack, namely in the same direction of rotation. This further improves the heat transfer from the conductor elements to the stator lamination stack and also the mechanical fixation of the conductor elements in the respective stator slot.

[0010] Furthermore, according to the invention, the plurality of twisted stator laminations are arranged in the stator laminated core in a plurality of spaced-apart groups of adjacent stator laminations, wherein one or more non-twisted stator laminations are located between each two groups of twisted stator laminations.

[0011] According to a first embodiment, the plurality of twisted stator laminations are arranged in the stator laminated core in a plurality of spaced-apart groups of adjacent stator laminations, with one or more non-twisted stator laminations being located between each group of twisted stator laminations.

[0012] According to a second embodiment, the plurality of twisted stator laminations are arranged individually in the stator laminated core, with one or more non-twisted stator laminations being located between each two twisted stator laminations.

[0013] The invention also provides that the multiple twisted stator laminations of the stator core are all twisted by the same angle. This results in a non-skewed stator.

[0014] Furthermore, it is advantageous if the stator slots provided with the conductor elements have cavities which are at least partially filled with an impregnating agent.

[0015] Furthermore, it is advantageous if the stator laminations of the stator laminated core are joined together, in particular welded, and / or form an interference fit with a stator housing of the electrical machine on the outer circumference, and / or are clamped between two bearing plates of the electrical machine in the axial direction relative to the stator axis. In this way, the stator laminations of the stator laminated core are fixed in their position.

[0016] In a method for producing the stator or the electrical machine not belonging to the claimed invention, it is provided that after the conductor elements have been inserted and before the stator laminations are fixed, at least one stator lamination of the stator laminated core is rotated in the circumferential direction with respect to the stator axis relative to other stator laminations of the stator laminated core in such a way that it protrudes into each stator slot of the stator laminated core with a lamination tooth section of one of the lamination teeth into the respective stator slot. drawing

[0017] Two embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. Fig.1 shows a stator of an electrical machine, Fig.2 a partial view of the stator according to Fig.1 in an unfinished state, Fig.3 a sectional view of a section through the unfinished stator laminated core along the section line III-III in Fig.2 , Fig.4 a partial view of a first embodiment of the stator according to the invention according to Fig.1 , Fig.5 a sectional view of a section through the stator laminated core along the section line VV according to Fig.4 , Fig.6 a partial view of a stator not belonging to the invention according to Fig.1 and Fig.7 a sectional view of a section through the stator laminated core along the section line VII-VII according to Fig.6 .

[0018] Fig.1 shows a stator.

[0019] The stator 1 of an electrical machine comprises at least one stator core 3, which is formed from a stack of stator laminations 4 and has a stator axis 2. The stator 1 or the stator core 3 has a plurality of stator teeth 5 and a plurality of stator slots 6 arranged between the stator teeth 5. The stator slots 6 are each formed between two stator teeth 5.

[0020] The stator laminations 4 each have a plurality of lamination teeth 7 and a lamination yoke 8 that connects the lamination teeth 7 to one another. The stator teeth 5 of the stator core 3 are each formed by stacked lamination teeth 7 of the stator laminations 4.

[0021] Fig.2 shows a partial view of the stator after Fig.1 in an unfinished state in which the stator laminations 4 are still loosely arranged on top of one another and all lamination teeth 7 of each individual stator tooth 5 of the stator laminated core 3 are arranged in alignment with one another, as shown in the sectional view according to Fig.3 recognizable.

[0022] The Fig.3 shows a sectional view according to a section through the unfinished stator laminated core 3 along the section line III-III in Fig.2 .

[0023] The stator 1 further comprises electrical conductor elements 10, which extend through the stator slots 6 of the stator core 3 and are provided for forming an electrical winding, for example, a plug-in winding. The conductor elements 10 each have a square, in particular rectangular, cross-section and are designed, for example, as so-called hairpins or so-called I-pins.

[0024] In the stator slots 6, for example, a slot insulation 11, for example a slot insulation paper, is provided for electrically insulating the conductor elements 10 from the stator laminated core 3.

[0025] The stator slots 6 provided with the conductor elements 10 have cavities 9 which, in the finished state of the stator 1, can be at least partially filled with an impregnating agent 16.

[0026] Fig.4 shows a partial view of a first embodiment of the stator according to the invention according to Fig.1 .

[0027] Fig.5 shows a sectional view of a section through the stator laminated core along the section line VV in Fig.4 , wherein the slot insulation 11 and one of the conductor elements 10 are additionally shown in the sectional view.

[0028] According to the invention, at least one stator lamination 4 is provided in the stator laminated core 3, which lamination is rotated in the circumferential direction with respect to the stator axis 2 relative to other stator laminations 4 of the stator laminated core 3 in such a way that it protrudes into each stator slot 6 of the stator laminated core 3 with a lamination tooth section 12 of one of the lamination teeth 7 into the respective stator slot 6.

[0029] The respective twisted stator lamination 4 protrudes in each stator slot 6 at one of the two stator teeth 5 delimiting the respective stator slot 6 with the lamination tooth section 12 into the respective stator slot 6 and at the other stator tooth 5 delimiting the respective stator slot 6 a depression 13 with a negative contour corresponding to the protruding lamination tooth section 12 is formed.

[0030] According to the Fig.4 bis Fig.7 In the stator laminated core 3, several stator laminations 4 are rotated in the circumferential direction with respect to the stator axis 2 compared to other stator laminations 4 of the stator laminated core 3, for example in the same direction of rotation.

[0031] According to the first embodiment according to Fig.4 und Fig.5 the plurality of twisted stator laminations 4 are arranged in the stator laminated core 3 in a plurality of spaced-apart groups 14 of adjacent stator laminations 4, wherein between each two groups 14 of twisted stator laminations 4 there are one or more non-twisted stator laminations 4.

[0032] Fig.6 shows a partial view of a stator not belonging to the invention according to Fig.1 .

[0033] Fig.7 shows a sectional view of a section through the stator laminated core along the section line VII-VII in Fig.6 , wherein the slot insulation 11 and one of the conductor elements 10 are additionally shown in the sectional view.

[0034] The plurality of twisted stator laminations 4 are arranged individually in the stator laminated core 3, with one or more non-twisted stator laminations 4 being located between each two twisted stator laminations 4.

[0035] For example, the multiple twisted stator laminations 4 of the stator core 3 are all twisted by the same angle of rotation. To achieve a skewed stator 1, the multiple twisted stator laminations 4 of the stator core 3 can alternatively each be twisted by a different angle of rotation that increases in the axial direction relative to the stator axis 2.

[0036] To produce a stator 1 not belonging to the invention, the following steps are carried out: a. Stacking the stator laminations 4 to form a stator laminated core 3, b. Optionally inserting the slot insulation 11 into the stator slots 6, c. Inserting the conductor elements 10 into the respective stator slots 6, d. Fixing the stator laminations 4 of the stator laminated core 3, for example by joining, in particular welding, the stator laminations 4.

[0037] In terms of time, after the conductor elements 10 have been inserted (step c) and before the stator laminations 4 have been fixed (step d), at least one stator lamination 4, for example a plurality of stator laminations 4, of the stator laminated core 3 is rotated in the circumferential direction with respect to the stator axis 2 relative to other stator laminations 4 of the stator laminated core 3 in such a way that it protrudes into each stator slot 6 of the stator laminated core 3 with a lamination tooth section 12 of one of the lamination teeth 7 into the respective stator slot 6.

Claims

1. Stator of an electric machine, comprising a laminated stator core (3), which has a stator axis (2), comprises a plurality of stator teeth (5) and a plurality of stator slots (6) formed between the stator teeth (5), and is formed by a plurality of stacked stator laminations (4); and comprising electrical conductor elements (10), which run through the stator slots (6) of the laminated stator core (3) and are provided in order to form an electrical winding, in particular a plugin winding, wherein a slot insulation (11), in particular a slot insulation paper, is provided in each of the stator slots (6) in order to electrically insulate the conductor elements (10) from the laminated stator core (3), wherein the stator laminations (4) each have a plurality of lamination teeth (7) and a lamination yoke (8), which connects the lamination teeth (7), wherein the stator teeth (5) of the laminated stator core (3) are each formed by stacked lamination teeth (7) of the stator laminations (4), wherein a plurality of stator laminations (4) are provided in the laminated stator core (3) and are rotated relative to other stator laminations (4) of the laminated stator core (3) in the same direction of rotation in the peripheral direction with respect to the stator axis (2) in such a way that, in each stator slot (6) of the laminated stator core (3), they each protrude by way of a lamination tooth portion (12) of one of the lamination teeth (7) into the respective stator slot (6), wherein the plurality of rotated stator laminations (4) in the laminated stator core (3) are arranged in a plurality of spaced-apart groups (14) of stator laminations (4) which bear against each other, wherein one or more non-rotated stator laminations (4) are situated between in each case two groups (14) of rotated stator laminations (4), characterized in that the plurality of rotated stator laminations (4) of the laminated stator core (3) are all rotated through the same angle of rotation.

2. Stator according to Claim 1, characterized in that the respective rotated stator lamination (4) in each stator slot (6) protrudes in each case from one of the two stator teeth (5) delimiting the respective stator slot (6) and having the lamination tooth portion (12) into the respective stator slot (6), and in that a recess (13) with a negative contour corresponding to the preceding lamination tooth portion (12) is formed on the other stator tooth (5) delimiting the respective stator slot (6).

3. Stator according to either of the preceding claims, characterized in that the stator slots (6) provided with the conductor elements (10) have cavities (9) which are at least partially filled with an impregnating agent (16).

4. Stator according to any of the preceding claims, characterized in that the conductor elements (10) each have a square, in particular rectangular, cross section and are designed as a hairpin or as an I-pin.

5. Electric machine comprising a stator according to any of the preceding claims, characterized in that the stator laminations (4) of the laminated stator core (3) are joined, in particular welded, to each other and / or on the outer circumference form a press-fit with a stator housing (20), and / or are clamped between two end plates of the stator housing (20) in the axial direction with respect to the stator axis (2).