Stator

Abstract

The invention relates to a stator (11) having a plurality of individual laminations (20, 21, 22) arranged one behind the other, wherein an individual lamination (20, 21, 22) has a plurality of lamination segments (2, 3, 14, 15, 16, 17).

Description

[0001] Description

[0002] stator

[0003] The invention relates to a stator.

[0004] Distortion when welding stacked individual sheets with a small yoke thickness to form a stator stack can cause problems with the thermal connection to the housing, slot cogging or torque ripple.

[0005] In addition, a lot of electrical steel is wasted in the production of conventional individual laminations for stators, especially with large stator diameters.

[0006] The invention is based on the object of improving this.

[0007] The object is achieved by claim 1, ie a stator having a plurality of individual laminations arranged one behind the other, wherein an individual lamination has a plurality of lamination segments.

[0008] The individual lamination can also be called a stator lamination.

[0009] By segmenting the stator laminations instead of using a solid blank, electrical sheet is saved. It is possible to make better use of electrical sheet during punching, as smaller parts can be punched.

[0010] An advantageous design is one in which the individual sheets have a baking varnish.

[0011] The individual sheets are preferably bonded together using a bonding varnish. The individual sheets can also be glued together using another material.

[0012] Bonding the individual sheets with self-bonding varnish, especially over the entire surface, is advantageous. This ensures a strong bond between the individual sheets. This reduces vibrations and noise. Furthermore, moisture penetration can be prevented. A design in which the sheet segments are congruent is advantageous. This facilitates the production of the sheets, which are punched from electrical steel, for example. Advantageously, only one punching tool is required.

[0013] The invention offers advantages in punching as less waste is generated.

[0014] Also advantageous is an embodiment according to which, viewed in the axial direction, a first sheet metal segment of a first individual sheet is arranged offset by an angle a to a first sheet metal segment of a second individual sheet.

[0015] The angle a is preferably at least 20° and at most 100°.

[0016] A design where the angle a = 36072n for n sheet segments is advantageous. A tolerance of + / - 10% is possible.

[0017] An embodiment is advantageous according to which a first sheet metal segment and a second sheet metal segment are connected in that a tenon of the first sheet metal segment engages in a tenon slot of the second sheet metal segment.

[0018] An advantageous embodiment is one in which a single sheet has at least two and at most eight sheet segments, for example four.

[0019] The tenon can have a rectangular contour. The tenon can be conical. A rounded contour is also possible. Various designs and shapes are conceivable.

[0020] The tenon and tenon slot can form a dovetail joint. Various connection options are possible. However, a dovetail joint of the segments is advantageous due to its strength and stability. A design with grooves for inserting a winding is advantageous.

[0021] The object is further achieved by a dynamoelectric rotary machine having such a stator. The invention is described and explained in more detail below with reference to the exemplary embodiments illustrated in the figures. They show:

[0022] FIG 1 a dovetail joint,

[0023] FIG 2 segmented stator laminations,

[0024] FIG 3 a machine.

[0025] FIG 1 shows a dovetail joint 1, by means of which two segments 2 and 3 are connected. Other connection types are also possible, but the dovetail joint offers high stability.

[0026] Advantageous connections are those in which a tenon 41 of one segment 3 engages a tenon slot 40 of another segment 2. A segment 2, 3 advantageously has a tenon slot 40 on one side and a tenon 41 on the other side.

[0027] FIG 2 shows segmented stator laminations 20, 21, 22.

[0028] The stator laminations are advantageously bonded using a baking varnish.

[0029] The stator lamination 20 has four segments 14, 15, 16, and 17. Two segments are connected to each other, preferably detachably. This is represented by connection 6.

[0030] Preferably, the segments are similar and uniform.

[0031] A dovetail joint, as shown in FIG. 1, is advantageous, but others are also possible. An anvil joint is one example.

[0032] In order to ensure stability over an axial length of the stator, the segments of a first stator lamination 20 are advantageously arranged offset from the segments of a further stator lamination 21.

[0033] FIG. 1 shows that the stator lamination 20 has four segments 14, 15, 16, and 17. The stator lamination 21 arranged axially behind it advantageously also has four segments. A first segment of the second stator lamination 21 is offset, for example, by an angle a = 45°. If a stator lamination is divided into six segments, an offset by an angle of 30° is advantageous. Two segments are also possible. Eight or more segments are also possible.

[0034] The angle of rotation a depends advantageously on the number of segments per stator lamination.

[0035] The twisting or offset arrangement advantageously conceals a point of contact between two segments.

[0036] It is also possible to package two or more, for example at least five and a maximum of 10, stator laminations with segments and to offset this sub-package to arrange a rotation angle to another sub-package.

[0037] The arrangement can be circumferential, for example, with a rotational offset by a constant angle in a positive direction of rotation. Reverse rotation is also possible, with a first stator lamination (or sub-package) and a second stator lamination (or sub-package) arranged offset by an angle in the positive direction of rotation, and the subsequent lamination or a subsequent lamination arranged offset by an angle in the negative direction of rotation.

[0038] A combination of a rotating and rotating arrangement is also conceivable.

[0039] The stator in FIG 2 also has slots 30 for inserting a winding.

[0040] FIG 3 shows a dynamoelectric rotary machine 10 with a shaft 12, a rotor 13, and a stator 11. The stator 11 preferably has the above features.

[0041] The invention is suitable for machines with a shaft height of 60 mm, but also for machines with a shaft height of 90 mm to 130 mm. Other shaft heights are also possible. The invention is particularly well-suited for large shaft heights.

[0042] The invention allows technical problems, particularly those related to thermal bonding to the housing, slot cogging, and / or torque ripple caused by welding distortion, to be avoided. Material is saved and less electrical sheet is required for electric motors with large stator diameters. To further prevent distortion, the segmented sheets are preferably bonded together using a bonding varnish.

[0043] Preferably, the stator has a housing (see reference numeral 7 in FIG 2), but a housing-free design is also possible.

Claims

Patent claims 1. Stator (11), comprising a plurality of individual laminations (20, 21, 22) arranged one behind the other, wherein an individual lamination (20, 21, 22) has a plurality of lamination segments (2, 3, 14, 15, 16, 17), wherein the individual laminations (20, 21, 22) have baked varnish and are connected by means of baked varnish.

2. Stator (11) according to claim 1, with an axle height of 60 mm, 90 mm to 130 mm or greater than 130 mm.

3. Stator (11) according to one of the preceding claims, with thermal connection to a housing.

4. Stator (11) according to one of the preceding claims, wherein the sheet metal segments (2, 3, 14, 15, 16, 17) are punched.

5. Stator (11) according to one of the preceding claims, wherein the sheet metal segments (2, 3, 14, 15, 16, 17) are congruent.

6. Stator (11) according to one of the preceding claims, wherein, viewed in the axial direction, a first sheet metal segment (2, 3, 14, 15, 16, 17) of a first individual sheet (20) is arranged offset by an angle a to a first sheet metal segment of a second individual sheet (21).

7. Stator (11) according to claim 6, wherein the angle a is at least 20° and at most 100°.

8. Stator (11) according to one of claims 6 or 7, wherein for n sheet segments the angle a = 36072n.

9. Stator (11) according to one of the preceding claims, wherein a first sheet metal segment (2, 3, 14, 15, 16, 17) and a second sheet metal segment are connected in that a pin (41) of the first sheet metal segment (3) engages in a pin slot (40) of the second sheet metal segment (2).

10. Stator (11) according to one of the preceding claims, wherein a single lamination has at least two and at most eight lamination segments, for example four.

11. Stator (11) according to one of the preceding claims, wherein the pin (41) has a rectangular contour.

12. Stator (11) according to one of the preceding claims, wherein the pin (41) is conical.

13. Stator (11) according to one of the preceding claims, wherein the pin (41) and pin slot (40) form a dovetail joint (1).

14. Stator (11) according to one of the preceding claims, wherein the individual sheets (20, 21, 22) have grooves (30) for inserting a winding.

15. Dynamoelectric rotary machine comprising a stator according to one of claims 1 to 14.

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