PRODUCTION DEVICE FOR PRODUCING A COIL OF AN ELECTRIC MACHINE

Abstract

A device for deflecting a coil includes a preformed body including a first portion configured as a circular arc to rest on the coil for bending, and a second portion adjoining the first portion and configured as a chord to rest on the coil for bending, wherein the first portion and the second portion are interchangeable.

Claims

1.-10. (canceled)

11. A device for deflecting a coil, the device comprising a preformed body including a first portion configured as a circular arc to rest on the coil for bending, and a second portion adjoining the first portion and configured as a chord to rest on the coil for bending, wherein the first portion and the second portion are interchangeable.

12. The device of claim 11, wherein the first portion has a circumferential angle of between 80° and 120°, preferably between 900 and 110°, particularly preferably approximately 105°, and the second portion has a circumferential angle of between 90° and 130°, preferably between 100° and 120°, particularly preferably approximately 115°.

13. The device of claim 11, wherein the preformed body is aligned during bending of the coil such that the chord of the second portion in relation to a coil longitudinal direction has an angle of between 5° and 45°.

14. The device of claim 11, wherein the preformed body is aligned during bending of the coil such that the chord of the second portion in relation to a coil longitudinal direction has an angle of between 10° and 30°.

15. The device of claim 11, wherein the preformed body is aligned during bending of the coil such that the chord of the second portion in relation to a coil longitudinal direction has an angle of between 15° and 25°.

16. The device of claim 11, wherein the preformed body is aligned during bending of the coil such that the chord of the second portion in relation to a coil longitudinal direction has an angle of approximately 20°.

17. A method for producing a coil having a multiplicity of windings, the method comprising bending the coil over a preformed body such that a first portion of the preformed body forms a first portion of the coil in a form of a circular arc, and a second portion of the preformed body in adjoining relation to the first portion forms a second portion of the coil in a form of a chord, wherein the first portion and the second portion are interchangeable.

18. The method of claim 17, wherein the first portion of the preformed body is configured as a circular arc, and the second portion of the preformed body portion is configured as a chord.

19. The method of claim 17, further comprising drawing the coil such that the coil in the second portion with a chord shape has windings at a mutual spacing which is smaller than a mutual spacing with a circular arc shape in the second portion.

20. The method of claim 17, further comprising drawing the coil such that the coil forms a continuous gradient in a region of end windings of the windings.

21. The method of claim 17 executed by a manufacturing device which comprises the preformed body in which the first portion is configured as a circular arc to rest on the coil for bending, and the second portion adjoins the first portion and is configured as a chord to rest on the coil for bending, wherein the first portion and the second portion of the formed body are interchangeable.

22. The method of claim 21, wherein the first portion of the preformed body has a circumferential angle of between 800 and 120°, preferably between 90° and 110°, particularly preferably approximately 105°, and the second portion of the preformed body has a circumferential angle of between 90° and 130′, preferably between 100° and 120°, particularly preferably approximately 115°.

23. The method of claim 21, wherein the preformed body is aligned during bending of the coil such that the chord of the second portion in relation to a coil longitudinal direction has an angle of between 5° and 45°.

24. The method of claim 21, wherein the preformed body is aligned during bending of the coil such that the chord of the second portion of the preformed body in relation to a coil longitudinal direction has an angle of between 10° and 30°.

25. The method of claim 21, wherein the preformed body is aligned during bending of the coil such that the chord of the second portion of the preformed body in relation to a coil longitudinal direction has an angle of between 15° and 25°.

26. The method of claim 17, wherein the preformed body is aligned during bending of the coil such that the chord of the second portion of the preformed body in relation to a coil longitudinal direction has an angle of approximately 20°.

27. A stator of an electric machine, comprising a coil which is pre-bent in a shape of a circular arc and a chord in adjoining relation to the circular arc.

28. The stator of claim 27, wherein the coil is manufactured by bending the coil over a preformed body such that a first portion of the preformed body forms a first portion of the coil in a form of the circular arc, and a second portion of the preformed body in adjoining relation to the first portion forms a second portion of the coil in a form of the chord.

Description

[0024] FIG. 1 an electric machine;

[0025] FIG. 2 a coil which is preformed by means of a circular preformed body;

[0026] FIG. 3 a circular preformed body;

[0027] FIG. 4 a manufacturing device;

[0028] FIG. 5 a preformed body with a segmented shape;

[0029] FIG. 6 a coil which is preformed by means of a preformed body with a segmented shape;

[0030] FIG. 7 a further coil which is preformed by means of a preformed body with a segmented shape; and

[0031] FIG. 8 a further preformed body.

[0032] The illustration according to FIG. 1 shows an electric machine 1 which has a stator 2 and a rotor 3. The stator 2 has end windings 4. The rotor 3 is rotatabiy mounted about an axis 5.

[0033] The illustration according to FIG. 2 shows coils 7, 7′ according to the prior art, which serve to form a winding head. The coils 7, 7′ have windings 8. In particular, tapes are used for the windings 8. The coil 7 does not yet have a bandage. The coil 7 does have a bandage, so it is bandaged, it being pointed out that the invention works with and without bandaging. Drawing the coil 7, 7′ towards the end windings results in a bulbous convexity 15, 15′ which should be avoided. The convexity 15, 15′ can also be recognized by the plotted contours 16. With the convexity, there is also a spreading of the windings 8 in this region. The convexity mentioned here takes place at 15 and 15′ in the direction of the groove (in FIG. 2 on the right along the coil along the “straight” part of the end windings).

[0034] The illustration according to FIG. 3 shows symbolically how the coils 7, 7′ were prefabricated in the prior art according to FIG. 1. FIG. 3 symbolizes a circular preformed body 10. The coil 7 is bent in a known manner about a circular preformed body 10 of this type. The coil 7 is guided (deflected) about the preformed body 10.

[0035] In contrast to FIG. 3, the illustration according to FIG. 4 now shows the procedure according to the invention or the preformed body 9 according to the invention. This also applies in an analogous manner to FIG. 5. The preformed body 9 has a circular arc 19 and a (here adjoining) chord 20 in the region on which the coil is applied during bending. Since the coil 7 is bent over the preformed body 9, the coil 7 also has a corresponding arc 21 and a corresponding chord 22. This results in a first portion 23 and a second portion 24 for the coil 7 and a first portion 17 and a second portion 18 for the preformed body 9.

[0036] It is easy to see that here the first portion 17 has a circumferential angle of 105′ and the second portion 18 has a circumferential angle of 115°, These angles determine the shape of the coil 7 produced, while the region on the left in FIG. 4, which does not play a role in bending, can be of any shape. It is round in shape here, but could also be shaped differently.

[0037] It can also be seen that the preformed body 9 when bending the coil 7 is aligned so that the chord 20 of the second portion 18 is at an angle of 20° with respect to the longitudinal direction of the coil—as here in FIG. 4. 20° is here, by way of example, the angle between the chord 20 and the horizontal, which indicates the direction of the main axis of the coil. The preformed body 9 is thus installed “asymmetrically” in the sense that the windings 8 emanating from the top left are formed first on the circular arc 19, and then formed immediately on the adjoining chord 20, lying obliquely below, so as to run on in a more or less straight manner until said windings 8 at the bottom left run straight again in the main direction or the main axis of the coil. The half-curved and half-straight preformed coil element with a circular arc 21 and a chord 22 is particularly well suited for further shaping into the end windings.

[0038] The illustration according to FIG. 5 shows the preformed body according to FIG. 4 in a schematic form with the circular arc 19 in the first portion 17 and the chord 20 in the second portion 18. The circular arc 19 is located in a first portion 17, i.e. the first preformed body portion. The chord 20 is located in a second portion 18, i.e. the second preformed body portion.

[0039] The illustration according to FIG. 6 shows a coil 7 which is bandaged. The coil 7 is placed in grooves 13, wherein the grooves 13 are configured by teeth 12. The coil 7 according to FIG. 6 is preformed by means of a preformed body which has a chord and a circular arc.

[0040] The illustration according to FIG. 7 shows the coil 7 according to FIG. 6 from a different perspective.

[0041] The illustration according to FIG. 8 shows a further preformed body 9 which can be used in the invention. This preformed body 9 in schematic form is constructed as a mirror image of the preformed body 9 of FIG. 5, with the first portion 18 and the second portion 17 being reversed in their order. It has a circular arc 19 in the second portion 17 and a chord 20 in the first portion 18. The circular arc 19 is located here in the second portion 17, the second preformed body portion. The chord 20 is located in the first portion 18, the first preformed body portion.