Abstract
A claw pole rotor (10) for an electrical machine (11) is specified, the claw pole rotor (10) comprising a rotor yoke (12), and at least two first claw pole fingers (13) and at least two second claw pole fingers (14), wherein the first and second claw pole fingers (13, 14) each are connected with the rotor yoke (12), the first claw pole fingers (13) extend from a first side (15) of the claw pole rotor (10) towards a second side (16) of the claw pole rotor (10), the second claw pole fingers (14) extend from the second side (16) towards the first side (15), one first magnet (17) is in each case arranged at the first side (15) between the first claw pole fingers (13), and one second magnet (18) is in each case arranged at the second side (16) between the second claw pole fingers (14). Moreover, a rotor arrangement (23) for an electrical machine (11) is specified.
Claims
1. A claw pole rotor for an electrical machine, the claw pole rotor comprising a rotor yoke, and at least two first claw pole fingers and at least two second claw pole fingers, wherein the first and second claw pole fingers each are connected with the rotor yoke, the first claw pole fingers extend from a first side of the claw pole rotor towards a second side of the claw pole rotor, the second claw pole fingers extend from the second side towards the first side, one first magnet is in each case arranged at the first side between the first claw pole fingers, and one second magnet is in each case arranged at the second side between the second claw pole fingers.
2. The claw pole rotor according to claim 1, wherein the first and the second magnets each are attached to the rotor yoke.
3. The claw pole rotor according to claim 1, wherein the magnetizing direction of the first magnets and the second magnets runs in each case in parallel to a radial direction in a cross-section through the claw pole rotor.
4. The claw pole rotor according to claim 1, wherein the magnetizing direction of the first magnets runs in each case in parallel to a radial direction in a cross-section through the claw pole rotor towards a center point of the claw pole rotor, and the magnetizing direction of the second magnets runs in each case in parallel to a radial direction in a cross-section through the claw pole rotor away from the center point of the claw pole rotor.
5. The claw pole rotor according to claim 1, wherein an exciter coil is arranged between the rotor yoke and the first and second claw pole finger within the claw pole rotor.
6. The claw pole rotor according to claim 1, wherein the first and second claw pole fingers each have a shorter extension along a longitudinal axis of the claw pole rotor than the entire claw pole rotor.
7. The claw pole rotor according to claim 1, wherein the first and second claw pole fingers each have at most the same extension along a longitudinal axis of the claw pole rotor as the entire claw pole rotor.
8. The claw pole rotor according to claim 1, wherein the first and second magnets each have a shorter extension along a longitudinal axis of the claw pole rotor than the first and second claw pole fingers.
9. The claw pole rotor according to claim 1, wherein each first magnet is in direct contact with one of the second claw pole fingers, and each second magnet is in direct contact with one of the first claw pole fingers.
10. The claw pole rotor according to claim 1, wherein the first and second magnets each have a recess in which a part of one of the claw pole fingers is arranged.
11. The claw pole rotor according to claim 1, wherein the sum of the number of the first magnets and the number of the second magnets is equal to the number of the magnetic poles of the claw pole rotor.
12. (canceled)
13. The rotor arrangement according to claim 1, wherein at least two of the claw pole rotors of the rotor arrangement have structures which differ from one another.
Description
[0033] In the following, the claw pole rotor described here and the rotor arrangement will be explained in more detail in conjunction with exemplary embodiments and the associated Figures.
[0034] In FIGS. 1A and 1B, a schematic cross-section through a part of an example of an electrical machine is shown.
[0035] In FIGS. 2A and 2B, an exemplary embodiment of the claw pole rotor is shown.
[0036] On the basis of FIGS. 3A, 3B and 3C, parts of an exemplary embodiment of the claw pole rotor are described.
[0037] On the basis of FIGS. 4A, 4B and 4C, a further exemplary embodiment of the claw pole rotor is described.
[0038] On the basis of FIG. 5A, 5B, 5C and 5D, a further exemplary embodiment of the claw pole rotor is described.
[0039] In FIG. 6A, an exemplary embodiment of the rotor arrangement is shown.
[0040] In FIGS. 6B and 6C, further exemplary embodiments of the rotor arrangement are shown.
[0041] In FIG. 7, a schematic cross-section through a part of an electrical machine having an exemplary embodiment of the claw pole rotor is shown.
[0042] In FIG. 1A, a schematic cross-section through a part of an example of an electrical machine 11 is shown. The electrical machine 11 is not an exemplary embodiment. The electrical machine 11 comprises a stator 24 and a claw pole rotor 10. The claw pole rotor 10 is not an exemplary embodiment. The stator 24 has a plurality of slots 26, in which an electrical winding 25 is arranged. Within the stator 24, the claw pole rotor 10 is arranged. The claw pole rotor 10 comprises an exciter coil 21.
[0043] In FIG. 1B, a cutout of the claw pole rotor 10 of FIG. 1A is shown. It is shown in this case that the exciter coil 21 is arranged between claw pole fingers 13, 14 and a rotor yoke 12.
[0044] In FIG. 2A, an exemplary embodiment of a claw pole rotor 10 for an electrical machine 11 is shown. The claw pole rotor 10 comprises a rotor yoke 12, four first claw pole fingers 13 and four second claw pole fingers 14. The first claw pole fingers 13 and the second claw pole fingers 14 are each connected with the rotor yoke 12. The rotor yoke 12 comprises a first annular component 19 and a second annular component 20. The first claw pole fingers 13 are connected with the first annular component 19. The second claw pole fingers 14 are connected with the second annular component 20. The first claw pole fingers 13 extend from a first side 15 of the claw pole rotor 10 towards a second side 16 of the claw pole rotor 10. The second claw pole fingers 14 extend from the second side 16 towards the first side 15. The first annular component 19 is arranged at the first side 15, and the second annular component 20 is arranged at the second side 16. The first annular component 19 is that part of the rotor yoke 12 arranged at the first side 15 in the form of a ring. The second annular component 20 is that part of the rotor yoke 12 arranged at the second side 16 in the form of a ring. The first annular component 19 can be seen in FIG. 2A between the first claw pole fingers 13. The second annular component 20 is illustrated in one piece with the second claw pole fingers 14. The second claw pole fingers 14, however, may also be separate components. The same applies to the first annular component 19 and the first claw pole fingers 13. The first and second claw pole fingers 13, 14 each have a shorter extension along a longitudinal axis L of the claw pole rotor 10 than the entire claw pole rotor 10.
[0045] One first magnet 17 is in each case arranged at the first side 15 between the first claw pole fingers 13. One second magnet 18 is in each case arranged at the second side 16 between the second claw pole fingers 14. Thus, the claw pole rotor 10 as a whole comprises four first magnets 17 and four second magnets 18. The first and the second magnets 17, 18 each are attached to the rotor yoke 12. Thus, the first magnets 17 are attached to the first annular component 19, and the second magnets 18 are attached to the second annular component 20. Each first magnet 17 is in direct contact with one of the second claw pole fingers 14. Each second magnet 18 is in direct contact with one of the first claw pole fingers 13. The sum of the length of one first magnet 17 and the length of one second claw pole finger 14 is equal to the entire length of the claw pole rotor 10. Likewise, the sum of the length of one second magnet 18 and the length of one first claw pole finger 13 is equal to the entire length of the claw pole rotor 10. The first and second magnets 17, 18 each have along a longitudinal axis L of the claw pole rotor 10 a shorter extension than the first and second claw pole fingers 13, 14. Thus, the installation space of the claw pole rotor 10 is efficiently utilized for generating torque.
[0046] In FIG. 2B, the exemplary embodiment of the claw pole rotor 10 of FIG. 2A is shown. In this case, the magnetizing directions of the first and second magnets 17, 18 are drawn by way of example by means of arrows. The magnetizing direction of the first magnets 17 and the second magnets 18 respectively runs in parallel to a radial direction r in a cross-section through the claw pole rotor 10. In this case, the magnetizing direction of the first magnets 17 runs in the cross-section through the claw pole rotor 10 towards the center point of the claw pole rotor 10. This means that the magnetizing directions of the four first magnets 17 run in different directions. The magnetizing direction of the second magnets 18 runs in the cross-section through the claw pole rotor 10 away from the center point of the claw pole rotor 10. This means that the magnetizing direction of the second magnets 18 runs in the cross-section through the claw pole rotor 10 from the center point to an outside 27 of the claw pole rotor 10. In this arrangement, each first magnet 17 magnetizes the two adjacent first claw pole fingers 13. Moreover, each second magnet 18 magnetizes the two adjacent second claw pole fingers 14. This results in the fact that the sum of the number of the first magnets 17 and the number of the second magnets 18 is equal to the number of the magnetic poles of the claw pole rotor 10.
[0047] In FIG. 3A, a cutout of the exemplary embodiment of the claw pole rotor 10 of FIG. 2A is shown. Both the first claw pole fingers 13 and the second claw pole fingers 14 are attached to the rotor yoke 12, which is located in some places within the claw pole rotor 10. The rotor yoke 12 extends from the first side 15 to the second side 16. It is further shown how the first magnets 17 are attached to the rotor yoke 12. The first magnets 17 are attached to the first annular component 19. The first annular component 19 extends in some places along the longitudinal axis L of the claw pole rotor 10. The first magnets 17 extend just as far as the first annular component 19 along the longitudinal axis L of the claw pole rotor 10. The same applies to the second magnets 18 and the second annular component 20.
[0048] In FIG. 3B, a further cutout of the exemplary embodiment of the claw pole rotor 10 of FIG. 2A is shown. In this case, the first annular component 19 with the first claw pole fingers 13 is illustrated. By way of example, one first magnet 17 is shown. The latter is arranged between two first claw pole fingers 13 at the first annular component 19.
[0049] In FIG. 3C, a further cutout of the exemplary embodiment of the claw pole rotor 10 of FIG. 2A is shown. In this case, the first annular component 19 with the first claw pole fingers 13 is illustrated as in FIG. 3B. One first magnet 17 is respectively arranged in each case between two first claw pole fingers 13 along the circumference of the first annular component 19.
[0050] In FIG. 4A, a further exemplary embodiment of the claw pole rotor 10 is shown. The claw pole rotor 10 is shown in a disassembled state. This is merely used for illustration purposes. The only difference from the exemplary embodiment shown in FIG. 2A is that an exciter coil 21 is arranged between the rotor yoke 12 and the first and second claw pole fingers 13, 14 in the claw pole rotor 10. The exciter coil 21 has approximately the shape of a hollow cylinder. The exciter coil 21 may be wound around a part of the rotor yoke 12, for example a rotor core. In a cross-section through the claw pole rotor 10 in a radial direction r, the exciter coil 21 is arranged between the rotor yoke 12 and the first and second claw pole fingers 13, 14.
[0051] In FIG. 4B, a cutout of the exemplary embodiment of the claw pole rotor 10 shown in FIG. 4A is shown. In this case, the claw pole rotor 10 is shown in the assembled state. The exciter coil 21 is arranged spaced from the first and second claw pole fingers 13, 14. Furthermore, the exciter coil 21 is arranged spaced from the first and second annular component 19, 20.
[0052] In FIG. 4C, the exemplary embodiment of the claw pole rotor 10 shown in FIG. 4A is shown in the assembled state.
[0053] In FIG. 5A, a cutout of a further exemplary embodiment of the claw pole rotor 10 is shown. In this case, the first and second claw pole fingers 13, 14 have along a longitudinal axis L of the claw pole rotor 10 at most the same extension as the entire claw pole rotor 10. The sum of the length of one first or second claw pole finger 13, 14 and the length of one first or second magnet 17, 18 along the longitudinal axis L of the claw pole rotor 10 is larger than the entire length of the claw pole rotor 10. This means that in each case one first claw pole finger 13 runs in some places coaxially to one second magnet 18. In each case, one second claw pole finger 14 runs in some places coaxially to one first magnet 17. In contrast to the exemplary embodiment shown in FIG. 4C, the first and second magnets 17, 18 each have a recess 22 in which a part of one of the claw pole fingers 13, 14 is arranged. The recesses 22 each may be adapted to the shape of the first and second claw pole fingers 13, 14. This means that the first magnets 17 each have a recess 22 for receiving a part of a second claw pole finger 14. The second magnets 18 each have a recess 22 for receiving a part of a first claw pole finger 13. The recesses may be adapted to the claw pole fingers 13, 14 such that the first and second magnets 17, 18 each are flush with the first and second claw pole fingers 13, 14 arranged therein, at an outside of the claw pole rotor 10. The first and second claw pole fingers 13, 14 are arranged in the recesses 22 such that in each case one side of the first and second claw pole fingers 13, 14 is free from the first and second magnets 17, 18. This means that the first and second claw pole fingers 13, 14 by means of one of their sides are not in contact with the first and second magnets 17, 18.
[0054] In FIG. 5B, one first magnet 17 of the exemplary embodiment of FIG. 5A is shown. The first magnet 17 has a recess 22. The recess 22 extends partially, i.e. not completely, through the first magnet 17. The second magnets 18 of the exemplary embodiment of FIG. 5A may likewise have the structure shown in FIG. 5B.
[0055] In FIG. 5C, a part of the exemplary embodiment shown in FIG. 5A is illustrated. The first annular component 19 having the first claw pole fingers 13 mounted thereto is shown. To the first annular component 19, the first magnets 17 having the recesses 22 are likewise mounted. The second annular component 20 with the second claw pole fingers 14 and the second magnets 18 may likewise have the structure shown in FIG. 5C.
[0056] In FIG. 5D, the exemplary embodiment of FIG. 5A is shown. In this case, the entire claw pole rotor 10 is illustrated.
[0057] In FIG. 6A, an exemplary embodiment of a rotor arrangement 23 is shown. The rotor arrangement 23 comprises two claw pole rotors 10. The two claw pole rotors 10 each have the structure shown in FIG. 4C. In the connecting plane between the two claw pole rotors 10, the first magnets 17 of one claw pole rotor 10 each adjoin directly the second magnets 18 of the other claw pole rotor 10. Likewise, the first claw pole fingers 13 of one claw pole rotor 10 directly adjoin the second claw pole fingers 14 of the other claw pole rotor 10. The two claw pole rotors 10 are in direct contact with one another.
[0058] In FIG. 6B, a further exemplary embodiment of the rotor arrangement 23 is shown. The only difference from the exemplary embodiment shown in FIG. 6A is that the two claw pole rotors 10 each have the structure shown in FIG. 5D.
[0059] In FIG. 6C, a further exemplary embodiment of the rotor arrangement 23 is shown. The rotor arrangement 23 comprises two claw pole rotors 10. The two claw pole rotors 10 have a structure that is different from one another. One of the claw pole rotors 10 has the structure shown in FIG. 4A, and the other one of the claw pole rotors 10 has the structure shown in FIG. 5A.
[0060] In FIG. 7, a schematic cross-section through a part of an electrical machine 11 having an exemplary embodiment of the claw pole rotor 10 is shown. The claw pole rotor 10 is the exemplary embodiment shown in FIG. 5D. The claw pole rotor 10 is arranged within a stator 24 of the electrical machine 11. The stator 24 has a plurality of slots 26 in which an electrical winding 25 is arranged.
