Electric motor with turnable rotor segments for reducing the magnetic flux

Abstract

The electrical motor includes a stator and a rotor configured to be rotated about an axis wherein the rotor includes at least three rotor subsegments, wherein a first and second rotor subsegment can be turned relative to one another about the axis in response to a rotation speed range being above a predetermined threshold value of a rotation speed of the electrical machine.

Claims

1. An electrical machine comprising: a stator comprising a plurality of flux guides; a rotor which can be rotated about an axis; the rotor comprising three rotor subsegments, wherein at least two rotor subsegments of which can be turned relative to one another about the axis; and wherein the at least two rotor subsegments can be turned relative to one another about the axis; wherein after a predetermined threshold value for a rotation speed of the electrical machine is exceeded, a first magnetic pole arrangement comprising a first pole of a first rotor subsegment, is disposed opposite to a second magnetic pole arrangement of a second rotor subsegment comprising a second pole; and wherein the at least three rotor subsegments each comprise a pair of magnetic bodies; wherein the pair of magnetic bodies are inclined with respect to a radial direction of the rotor.

2. The electrical machine of claim 1, wherein the first and second magnetic pole arrangements alternate in a circumferential direction of the rotor.

3. The electrical machine of claim 2, wherein each magnetic body form a V-shaped arrangement.

4. The electrical machine of claim 3, wherein at least one of the magnetic bodies forms an angle of between +/−10 to +/−60 degrees with radial direction of the rotor.

5. The electrical machine of claim 1, wherein magnetic flux is suppressed in a direction through the stator.

6. The electrical machine of claim 5, wherein the at least two rotor subsegments which can be turned relative to one another have an identical width.

7. The electrical machine of claim 1, wherein a turning device carries out the relative turning of the at least two rotor subsegments which can be turned relative to one another in predetermined steps or continuously.

8. An electrical machine having: a stator comprising a plurality of teeth; and a rotor configured to be rotated about an axis wherein the rotor includes at least three rotor subsegments, wherein a first and second rotor subsegment can be turned relative to one another about the axis relative to one another in a rotation speed range above a predetermined threshold value of a rotation speed of the electrical machine in a manner that a magnetic effect of the first and second rotor subsegment cancel each other out; wherein the at least three rotor subsegments each comprise a pair of magnetic bodies; and wherein the pair of magnetic bodies are inclined with respect to a radial direction of the rotor.

9. The electrical machine of claim 8, wherein the rotor includes a third rotor subsegment that determines an overall effect of the electrical machine.

10. The electrical machine of claim 8, wherein a third rotor subsegment includes a third magnetic pole arrangement that includes a first and second pole.

11. The electrical machine of claim 8, wherein the first and second rotor subsegments each have a first magnetic pole arrangement with a first pole and a second magnetic pole arrangement with a second pole, wherein the first and second magnetic pole arrangements alternate in a circumferential direction of the rotor.

12. The electrical machine of claim 8, wherein the first and second rotor subsegments include magnetic bodies form a V-shaped arrangement in the rotor.

13. An electrical motor comprising: a stator comprising a variety of teeth; and a rotor configured to be rotated about an axis wherein the rotor includes at least three rotor subsegments, wherein a first and second rotor subsegment can be turned relative to one another about the axis in response to a rotation speed range being above a predetermined threshold value of a rotation speed of the electrical motor; wherein the electrical motor includes a first magnetic pole arrangement of the first rotor subsegment situated opposite a second magnetic pole arrangement of the second rotor subsegment in a direction of the axis, wherein the first magnetic pole arrangement has a first pole and the second magnetic pole arrangement has a second pole; and wherein each of the at least three rotor subsegments comprise a pair of magnetic bodies that are inclined with respect to a radial direction of the rotor.

14. The electrical motor of claim 13, wherein the first and second rotor subsegments are configured to turn relative to one another to cancel a magnetic force of each rotor subsegment out and a magnetic effect of the electrical motor.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The disclosure will be explained in more detail below with reference to an exemplary embodiment in conjunction with associated drawings, in which:

(2) FIG. 1 schematically shows a three-dimensionally sectioned portion of an electrical machine comprising a rotor and a stator;

(3) FIG. 2 schematically shows a three-dimensionally sectioned portion of an electrical machine comprising a rotor and a stator in a perspective offset in comparison to FIG. 1;

(4) FIG. 3 schematically shows a plan view of a front rotor subsegment from FIGS. 1 and 2; and

(5) FIG. 4 schematically shows a plan view of a rear rotor subsegment from FIGS. 1 and 2.

DETAILED DESCRIPTION

(6) In the following description, the same reference signs are used for identical objects.

(7) FIG. 1 shows a three-dimensionally sectioned portion of an electrical machine 1 comprising a rotor 3 and a stator 2.

(8) More precisely illustrated, FIG. 1 shows an electrical machine 1 comprising a stator 2 and a rotor 3 which can be rotated about an axis A.

(9) In this case, the rotor 3 has three rotor subsegments, only two rotor subsegments 4, 5 of which are illustrated; the third rotor subsegment adjoins either the rotor subsegments 4 or the rotor subsegments 5.

(10) The two rotor subsegments 4, 5 can be turned relative to one another about the axis A.

(11) A turning device serves to relatively turn the two rotor subsegments 4, 5 which can be turned relative to one another.

(12) Said turning device turns the two rotor subsegments 4, 5, which can be turned relative to one another, relative to one another in a rotation speed range above a predetermined threshold value of a rotation speed of the electrical machine 1 in such a way that effects of the two rotor subsegments 4, 5 which can be turned relative to one another substantially completely cancel each other out and an overall effect of the electrical machine 1 is determined by a third rotor subsegment.

(13) FIG. 1 further shows that the rotor subsegments 4, 5, but also the third rotor subsegment, each have a first magnetic pole arrangement 6 with a first pole N and a second magnetic pole arrangement 7 with a second pole S. In this case, the first magnetic pole arrangement 6 and the second magnetic pole arrangement 7 alternate circumferential direction U of the rotor 3 or of the rotor subsegments 4, 5.

(14) To once again express the above substantive matter in different words or to illustrate said substantive matter more precisely, the turning device is able to turn the two rotor subsegments 4, 5, which can be turned relative to one another, relative to one another.

(15) Specifically, the rotor subsegments 4, 5 can be turned by the turning device in such a way that, after a predetermined threshold value for the rotation speed of the electrical machine 1 is exceeded, a first magnetic pole arrangement 6 of the first rotor subsegment 4, which first magnetic pole arrangement has a first pole N, is situated opposite a second magnetic pole arrangement 7 of the second rotor subsegment 5, which second magnetic pole arrangement has a second pole S, in the direction of the axis A.

(16) In this way, the magnetic effects of the two rotor subsegments 4, 5 substantially cancel each other out and a third magnetic pole arrangement of a third rotor subsegment, which third magnetic pole arrangement has a first or second pole N, S, determines the technical design of the electrical machine 1.

(17) The turning device has a switchable electromagnet which carries out the turning operation in such a way that one of the two rotor subsegments 4, 5 which can be turned relative to one another is offset in the direction of the axis. A, then turned through a predetermined angle and repositioned in an opposite direction to the offsetting operation.

(18) As is clearly shown in FIG. 1, each of the magnetic pole arrangements 6, 7 has two magnetic bodies 6A, 6B and, respectively, 7A, 7B. Said magnetic bodies form a V-shaped arrangement in the rotor 3.

(19) Outlined in other words, the magnetic bodies 6A, 6B and, respectively, 7A, 7B are inclined with respect to a radial direction R of the rotor 3.

(20) In respect of the inclination, it should be noted that each of the magnetic bodies 6A, 6B; 7A, 7B forms an angle of between +/−39 and +/−41 degrees with the radial direction R of the rotor 3.

(21) As further shown in FIG. 1, the two rotor subsegments 4, 5 which can be turned relative to one another have an identical width B.

(22) FIG. 2 shows, similarly to FIG. 1, a three-dimensionally sectioned portion of the electrical machine 1 comprising the rotor 3 and the stator 2, but in a perspective offset in comparison to FIG. 1.

(23) In respect of the further statements, reference is made to the statements relating to FIG. 1, which can be applied analogously here, in order to avoid unnecessary repetition.

(24) Therefore, only supplementary information which likewise applies to FIG. 1 is found below.

(25) Therefore, FIGS. 1 and 2 show the stator 2 which has a plurality of slots 8 or cutouts for winding and also a variety of teeth 9 or flux guides.

(26) Whereas FIG. 3 illustrates a plan view of a front rotor subsegment or of the rotor subsegment 5 from FIGS. 1 and 2, FIG. 4 shows a plan view of a rear rotor subsegment or of the rotor subsegment 4, likewise shown in FIGS. 1 and 2.

(27) In respect of the further statements, reference is made to the statements relating to FIGS. 1 and 2, which can be analogously applied to FIGS. 3 and 4 here, in order to avoid unnecessary repetition.

(28) Therefore, supplementary information which likewise applies to FIGS. 1 and 2 is found below.

(29) Therefore, FIGS. 3 and 4 show that a first magnetic pole arrangement 6 of the first rotor subsegment 4, which first magnetic pole arrangement has a first pole N, is respectively situated opposite a second magnetic pole arrangement 7 of the second rotor subsegment 4, which second magnetic pole arrangement has a second pole S, in the direction of the axis A.

(30) As a consequence, a passage area which concentrates a magnetic flux in the direction of the axis A is in each case produced between the first magnetic pole arrangements 6 and the second magnetic pole arrangements 7. As a result, a magnetic flux in the direction through the stator 2 is substantially suppressed.

(31) It is of course also possible for the turning device to turn the two rotor subsegments 4, 5, which can be turned relative to one another, relative to one another in a rotation speed range below a predetermined threshold value of a rotation speed of the electrical machine 1 in such a way that magnetic effects of the two rotor subsegments 4, 5 which can be turned relative to one another do not substantially completely cancel each other out.

(32) Consequently, an overall effect of the electrical machine 1 is determined by the two rotor subsegments 4, 5 which can be turned relative to one another and by the third rotor sub segment.

(33) Furthermore, it should be noted that the turning device can carry out the relative turning of the two rotor subsegments 4, 5 which can be turned relative to one another in predetermined steps or continuously.

LIST OF REFERENCE SYMBOLS

(34) 1 Electrical machine 2 Stator 3 Rotor 4 First rotor subsegment 5 Second rotor subsegment 6 First magnetic pole arrangement 6A Magnetic body 6B Magnetic body 7 Second magnetic pole arrangement 7A Magnetic body 7B Magnetic body 8 Slot/Cutout for winding 9 Tooth/Flux guide for stator A Axis/Rotation axis B Width N First pole S Second pole R Radial direction U Circumferential direction