EP3714526A1

EP3714526A1 - Stabilizer actuator having a permanent magnet motor

Info

Publication number: EP3714526A1
Application number: EP18795489.6A
Authority: EP
Inventors: Volker Schulmayer
Original assignee: ZF Friedrichshafen AG
Current assignee: ZF Friedrichshafen AG
Priority date: 2017-11-24
Filing date: 2018-10-25
Publication date: 2020-09-30
Also published as: CN111373632A; WO2019101467A1; DE102017221030A1

Abstract

The invention relates to a stabilizer actuator (6) for the relative rotation of two stabilizer parts (2, 3) of a roll stabilizer (1), comprising a housing (7) and a permanent magnet motor (9) arranged therein for applying a torque, which permanent magnet motor comprises a stator (11) connected to the housing (7) in a rotationally fixed manner and a rotor (12) mounted for rotation relative to the stator about an axis of rotation (13), the stator (11) having, in the circumferential direction, a plurality of stator grooves, which extend in the axial direction and accommodate a coil winding, and the rotor (12) having, in the circumferential direction, a plurality of magnet segments, which extend in the axial direction and are carried by a rotor core. In order to reduce cogging, the stator grooves or the magnet segments each have an inclination such that the stator grooves or the magnet segments, in the course of the entire axial length thereof, extend both in the axial direction and in the circumferential direction of the stator (11) and/or of the rotor (12). The invention further relates to a roll stabilizer (1) for a motor vehicle having a stabilizer actuator (6) of this type.

Description

Stabilizer actuator with a Permanentmaqnetmotor

The present invention relates to a Stabilisatoraktor for relative rotation of two stabilizer parts of a roll stabilizer, in particular for a motor vehicle, according to the closer defined in the preamble of the independent claims Art. Furthermore, the invention relates to a roll stabilizer with such a Stabilisatoraktor according to the preamble of the further independent claim.

The known from the prior art stabilizer actuators include permanent magnet motors, which have an undesirable cogging due to their Groove. This leads to various disturbances of the motion sequence and influences the control accuracy and dynamics of the stabilizer actuator.

The object of the present invention is thus to improve the control accuracy and dynamics of a stabilizer actuator.

The object underlying the invention is solved by the features of the independent claims. Further advantageous embodiments will become apparent from the dependent claims and the drawings.

Proposed is a stabilizer actuator for relative rotation of two stabilizer parts of a roll stabilizer. The stabilizer actuator is preferably provided for an active roll stabilizer of a motor vehicle. The stabilizer actuator includes a housing and a permanent magnet motor disposed in the housing. The permanent magnet motor is provided for introducing a torque. The permanent magnet motor comprises a stator rotatably connected to the housing. Furthermore, this permanent magnet motor has a rotor rotatably mounted relative to the stator about a rotation axis. The stator has in the circumferential direction a plurality of axially extending and a coil winding receiving stator slots. Furthermore, the rotor has a rotor core. Furthermore, the rotor comprises in the circumferential direction a plurality of axially extending and supported by the rotor core magnetic segments. The stator slots or the magnet segments each have a skew to reduce a Nutrastens. By means of the bevel, the stator slots or the magnet segments are formed such that the stator slots or the magnet segments extend in the course of their entire axial length both in the axial direction and in the circumferential direction of the stator and / or rotor. As a result, these do not run parallel to the axis of rotation, but in a plan view, in particular continuously or stepped, obliquely to this. Advantageously, thus the Nutrasten can be reduced, whereby the control accuracy and dynamics of the stabilizer can be improved.

It is advantageous if the bevel is formed continuously. In this case, the skew has a slope that runs obliquely to the axis of rotation and has a continuous gradient. The slope course thus has no cracks.

In this regard, it is also advantageous if the slope of the continuous pitch curve is constant. As a result, the skew and / or its pitch curve is formed as straight.

In an advantageous development of the invention, the magnet segments are arranged obliquely on the rotor core in order to form the continuous bevel relative to the axis of rotation. Alternatively, however, it is also advantageous if the magnet segments for forming the continuous skew have a basic shape formed in plan view as a parallelogram. Additionally or alternatively, the longitudinal sides of the magnet segments in a plan view preferably not parallel, but obliquely to the axis of rotation.

As an alternative to the above continuous skewing, it is advantageous if the skew is stepped. The skew thus has an oblique to the axis of rotation, stepped slope course. The slope course therefore has at least one, but preferably a plurality of, stage.

The stepped bevel can be formed particularly cost-effective, if the magnet segments preferably each comprise at least two adjacent to each other in the axial direction of segment parts having a circumferential offset to each other. Preferably, the segment parts extend only in the axial direction and in the course of its entire axial length not in the circumferential direction. As a result, they preferably have a rectangular basic shape in plan view. Additionally or alternatively, their longitudinal sides extend in a plan view preferably parallel to the axis of rotation.

It is also advantageous if the magnet segments are circumferentially adjacent to each other or spaced apart.

In an advantageous embodiment of the invention, the magnet segments are each attached to a radially inner connecting surface on an outer circumference of the rotor, in particular glued.

In order to be able to produce the magnet segments as inexpensively as possible, it is advantageous if the connecting surfaces of the magnet segments are planar and the outer circumference of the rotor core has bevels corresponding to the planar connecting surfaces. The magnet segments are thus preferably glued with their planar connecting surfaces on the respective corresponding bevels.

Alternatively, it is advantageous if the connecting surfaces of the magnet segments are concave in an end view, so that they correspond to an outer peripheral rounding of the rotor core.

In a further alternative embodiment, it is advantageous if the rotor core has a plurality of circumferentially extending pockets in the axial and / or circumferential direction in which the magnet segments are received. Preferably, these pockets extend in the course of their entire axial length exclusively in the axial direction and not in the circumferential direction. As a result, the manufacturing cost can be reduced.

It is advantageous for the rotor core to comprise at least two mutually axially adjacent rotor core sections which are twisted relative to one another in order to form the stepped bevel. By this rotation, the magnetic segments the two rotor core sections to each other on a circumferential offset, whereby advantageously the stepped skew is formed. In this regard, it is of course conceivable that the rotor core has more than two such interconnected rotor core sections.

It is advantageous if the stabilizer actuator has a transmission, which is arranged in the housing and designed in particular as a multi-stage planetary gear, is coupled to the rotor of the permanent magnet motor.

It is also advantageous if the rotor core, in particular the rotor core sections, are formed of braided steel. As a result, the rotor core is composed of a plurality of sheets extending transversely and disposed axially one after the other.

Furthermore, it is advantageous if at least one substantially recess extending in the axial direction, in particular in the form of a groove, is formed on the stator. Such a groove advantageously contributes to increasing an effective magnetic air gap between the stator and the rotor, which in turn reduces the nutastasting magnetic interaction between the stator and rotor at least slightly.

Further proposed is a stabilizer actuator for relatively rotating two stabilizer parts of a roll stabilizer with a housing and a permanent magnet motor arranged therein for introducing a torque. The permanent magnet motor has a coil winding rotatably connected to the housing and a rotor rotatably mounted relative to this about a rotation axis. The rotor has in the circumferential direction a plurality of axially extending and supported by a rotor core magnetic segments. The coil winding is ironless to avoid a Nutrastens. Additionally or alternatively, the coil winding is supported radially outside of a return ring. Alternatively, the coil winding may also be designed to be self-supporting. As a result, a cogging can be avoided, since the stabilizer actuator can be formed without Statornuten. Further proposed is a roll stabilizer for a motor vehicle with two mutually rotatable stabilizer parts and a stabilizer actuator for relative rotation of the two stabilizer parts. The stabilizer actuator is designed according to the preceding description, wherein said features may be present individually or in any combination.

The invention is explained in more detail with reference to drawings. Show it:

1 shows a schematic diagram of a roll stabilizer with a stabilizer actuator for relative rotation of two stabilizer parts of the roll stabilizer,

FIG. 2 shows a schematic illustration of a stabilizer actuator according to a first exemplary embodiment, in which magnet segments are arranged on the outer circumference of a rotor core,

3 shows a rotor of the stabilizer actuator shown in FIG. 2 with a continuous skew, FIG.

FIG. 4 shows a further exemplary embodiment of a rotor for a stabilizer actuator according to FIG. 2, which has a stepped skew,

Figure 5 shows a second embodiment of a stabilizer actuator, in which the

Magnetic segments are integrated in the rotor core,

FIGS. 6 and 7 show a rotor for the stabilizer actuator according to FIG

Rotor core sections are rotated to each other, and

8 shows a coil winding for a stabilizer actuator, which is a self-supporting

Winding has, FIG. 9 a schematic representation of a stabilizer actuator according to a further exemplary embodiment, in which grooves running in the axial direction are formed on the stator,

Figure 10 is a schematic representation of a Stabilisatoraktors according to another embodiment, in which the stator in the axial direction extending grooves are formed.

Figure 1 shows a simplified schematic structure of a roll stabilizer 1. This roll stabilizer 1 is an active roll stabilizer 1, by means of which a torque can be actively activated by appropriate control. The present roll stabilizer 1 is provided for a motor vehicle. The roll stabilizer 1 comprises two stabilizer parts 2, 3, which are rotatable relative to each other. Furthermore, the roll stabilizer 1 comprises two stabilizer bearings 4,

5, by means of which the roll stabilizer 1, in particular the respective stabilizer part 2, 3, is rotatably mounted on a structure and / or subframe, not shown here. In the region of their free ends, the two stabilizer parts 2, 3 are coupled to a suspension, not shown here.

The roll stabilizer 1 comprises a stabilizer actuator 6. By means of this, the two stabilizer parts 2, 3 are rotated relative to each other in order to actively turn on a torque can. The stabilizer actuator 6 comprises a housing 7. The housing 7 is rotatably coupled at one of its two ends with one of the two stabilizer parts 2. Here, the housing 7 may be integrally formed with the first stabilizer part 2 or else be releasably or permanently connected thereto. At the other end, the housing 7 has an opening 8, via which the second stabilizer part 3 projects into the housing 7.

The stabilizer actuator 6 comprises a permanent magnet motor 9. Furthermore, the stabilizer actuator 6 has a gear 10. The transmission 10 is preferably a multi-stage planetary gear. Here, the second stabilizer part 3 is preferably connected to a not shown here planet carrier of the transmission 10. The permanent magnet motor 9 is inside the housing 7 arranged. The same applies to the transmission 10. The permanent magnet motor 9 is coupled to the transmission 10, so that a torque generated by this torque is transmitted from the transmission 10 to the second stabilizer part 3. As a result, a relative rotation between the first stabilizer part 2 and the second stabilizer part 3 is caused.

The permanent magnet motor comprises a stator 11 and a rotor 12. The stator 11 is arranged radially outside. Furthermore, this is rotatably connected to the housing 10. The rotor 12 is disposed radially inwardly relative to the stator 11. Furthermore, the rotor is rotatably mounted about a Rotationsachsel 3. For this purpose, the permanent magnet motor 9 preferably has two bearings, not shown here, via which the rotor 12 is rotatably mounted on a support of the permanent magnet motor 9 or directly on the housing 7. The rotor 12 is connected to a transmission input shaft 14 of the transmission 10. The transmission input shaft 14 preferably forms a sun gear of the transmission 10.

Figure 2 shows an end view of the permanent magnet motor 9 in a highly simplified representation according to a first embodiment. The permanent magnet motor 9 comprises, as already mentioned above, the radially inner rotor 12, which is rotatably mounted about the rotation axis 13. Furthermore, the permanent magnet motor 9 comprises the radially outer stator 11. The stator 11 has a plurality of stator slots 15 in the circumferential direction, of which only one is provided with a reference numeral for reasons of clarity. The stator 15 extend in the axial direction of the permanent magnet motor 9. Furthermore, the permanent magnet motor 9 comprises a coil winding 16. This coil winding 16 forms at least one coil. The coil winding is received in the stator 15 over the entire circumference of the stator 11 distributed.

As shown in FIG. 2, the rotor 12 includes a rotor core 17 and a plurality of magnet segments 18. The magnet segments 18 are supported by the rotor core 17. Furthermore, the magnet segments 18 are distributed over the entire circumference of the rotor core 17. The magnet segments 18 extend in the axial direction of the permanent magnet motor 9. According to the present embodiment the magnet segments 18 are circumferentially spaced from each other. Alternatively, however, it is also conceivable that they abut one another in the circumferential direction. Furthermore, the magnet segments 18 according to FIG. 2 are fastened to an outer circumference 19 of the rotor core 17. For this purpose, the magnet segments 18 are each adhesively bonded to a radially inner connecting surface 20 on the outer circumference 19 of the rotor core 17.

According to the embodiment shown in Figure 2, the magnetic segments 18 are concave in the present frontal view. As a result, they have a concave connection surface 20. This respective concave connecting surface 20 of the magnet segments 18 corresponds in this case to an outer circumferential rounding of the outer circumference 19 of the rotor core 17. Alternatively, the outer circumference 19 of the rotor core 17 may have chamfers according to an embodiment not shown here. As a result, the rotor core 17 would have an N-cornered shape. In this case, the connecting surfaces 20 of the magnetic segments 18 could be formed flat. The planar connecting surfaces 20 of the magnetic segments 18 would thus be manufactured inexpensively and can be glued to the likewise flat bevels of the rotor core 17.

Preferably, the rotor core 17 is formed of a laminated steel. Here, the rotor core is composed of several extending in the transverse direction of the rotor 12 sheet metal layers. These can be coated with an insulating layer, whereby hysteresis effects can be reduced.

FIG. 3 shows the rotor 12 of the permanent magnet motor 9 shown in FIG. 2 according to a first exemplary embodiment. Thereafter, the magnetic segments 18 for reducing a Nutrastens each have a slope 21. As a result of this bevel 21, the magnet segments 18 extend in the course of their entire axial length both in the axial direction and in the circumferential direction of the rotor 12. Advantageously, thereby a cogging of the permanent magnet motor 9 can be reduced. The bevel 21 is formed continuously in the embodiment shown in FIG. This means that a gradient of the inclination 21 has a slope over the entire axial length. As a result, the magnetic segments 18 extend obliquely to the axis of rotation 13. As is apparent from Figure 3, the slope of this continuous pitch curve is formed constant. Accordingly, the skew 21 represents a straight line. In order to form this continuous skew 21, the magnet segments 18 are provided with a basic shape designed as a parallelogram. As a result, their longitudinal sides extend obliquely to the axis of rotation 13. Alternatively, the magnetic segments 18 but could also be rectangular and twisted to form the continuous skew to the rotation axis 13 and thus be obliquely fixed to the rotor core 17.

Figure 4 shows an alternative embodiment of the rotor 12 for a permanent magnet motor 9 according to the embodiment shown in Figure 2. Also in this case, the magnet segments 18 of the rotor 12 have a skew 21. The magnet segments 18 extend as a result of this bevel 21 with respect to the entire axial length of the respective magnet segment 18 both in the axial direction and in the circumferential direction of the rotor 12. In contrast to the embodiment shown in Figure 3, however, the slope 21 is stepped. As a result, the bevel 21 has a slope course running obliquely to the rotation axis 13 and stepped. The pitch curve has a step 22 according to the embodiment shown in FIG. Alternatively, however, several such stages 22 could form the stepped slope course. Only in the region of the at least one step 22, the gradient course on a slope. In the regions of the magnet segment 18 adjoining the step, the gradient curve has a slope of zero.

In order to be able to form this stepped slope 21, the magnet segments 18 according to FIG. 4 each comprise at least two adjacent segment parts 23, 24 in the axial direction. In the present case, each of the magnet segments 18 comprises two of these segment parts 23, 24, whereby more than two of these segment parts also comprise a magnet segment Could train 18. The segment parts 23, 24 extend exclusively in the axial direction. This means that their propagation in the circumferential direction does not change over the length of the rotor 12. The segment parts 23, 24 are therefore formed as rectangles. To form the stepped bevel 21 are the two adjacent to each other in the axial direction of the segment parts 23,

24, which together form the respective magnet segment 18, offset from each other in the circumferential direction. As a result, these have a circumferential offset 25 which can be written on by an angle. This circumferential offset 25 forms a step 22 of the stepped gradient course of the skew 21.

Figure 5 shows a second embodiment of the permanent magnet motor 9 for the roll stabilizer 1 shown in Figure 1. In the following description of this alternative permanent magnet motor 9 are for features compared to the first embodiment shown in Figure 2 in their configuration and / or mode of action identical or at least are comparable, the same reference numerals used. Unless these are explained again in detail, their design and mode of action corresponds to that of the features already described above.

Thus, the fundamental difference between these two embodiments is that the magnetic segments 18 are not disposed on the outer periphery 19 of the rotor core 17 but instead are integrated therein. Thus, the rotor core 17 according to the embodiment shown in Figure 5 comprises a plurality of pockets 26, of which for reasons of clarity, only one is provided with a reference numeral. The pockets 26 are distributed in the circumferential direction of the rotor core 17. In each of these pockets 26, a magnetic segment 18 is received.

Figures 6 and 7 show the rotor 12 for the permanent magnet motor 9 shown in Figure 5 according to a first embodiment. Thereafter, the pockets 26 extend exclusively in the axial direction. This means that they are essentially rectangular. As a result, their dimensions do not change in the circumferential direction in the axial direction of the rotor 12. However, in order to form a stepped skew, the rotor core 17 comprises a plurality of rotor core sections 27, 28. In the present case, the rotor core 17 comprises four such rotor core sections 27, 28 of which, for reasons of clarity, only two with a reference symbol are provided. These rotor core sections 27, 28 are rotated relative to one another, in particular in the same direction of rotation. As a result, the respective magnet segments 18 of the respective rotor core sections 27, 28 are thus also rotated relative to each other, so that they have a peripheral offset 25. As a result, the rotor 12 shown in FIGS. 6 and 7, like the rotor 12 shown in FIG. 4, has a stepped bevel 21. The rotor core sections 27, 28 may be glued together.

In an embodiment not shown here, the skew 21 could alternatively be formed in the stator in the embodiments illustrated in FIGS. 3, 4, 6 and 7. Accordingly, the Statornuten 15 for reducing the Nutrastens each having a corresponding slope 21, so that the Statornuten 15 extend over its entire axial length in both the axial and in the circumferential direction of the stator 11. In this case, the magnet segments 18 of the rotor 12 would have no skew 21.

FIG. 8 shows a coil winding 16 for avoiding grooving. This can be used as an alternative to the preceding embodiments. After that, the coil winding 16 is ironless. According to the present embodiment shown in FIG. 8, the coil winding 16 has a self-supporting winding. Accordingly, the coil winding 16 according to the present embodiment shown in Figure 8 does not require a support element, such as the mentioned in the preceding embodiments stator 11. Alternatively, the coil winding 16 may be supported in a presently not shown embodiment but also by a radially outer return ring.

9 shows an end view of the permanent magnet motor 9 in a greatly simplified representation according to a further exemplary embodiment. The permanent magnet motor 9 again comprises a radially inner rotor 12, which is rotatably mounted about the rotation axis 13. Furthermore, the permanent magnet motor 9 comprises the radially outer stator 11. The stator 11 has a plurality of stator slots 15 in the circumferential direction, of which only one is provided with a reference numeral for reasons of clarity. The stator slots 15 extend in the axial direction of the perma nentmagnetmotors 9. Furthermore, the permanent magnet motor 9 comprises coil windings 16. A coil winding 16 forms at least one coil. The coil winding is received in the stator 15 over the entire circumference of the stator 11 distributed.

As shown in FIG. 9, the rotor 12 includes a rotor core 17 and a plurality of magnet segments 18. The magnet segments 18 are supported by the rotor core 17. Furthermore, the magnet segments 18 are distributed over the entire circumference of the rotor core 17. The magnet segments 18 extend in the axial direction of the permanent magnet motor 9. A recess in the form of a groove 29, which extends essentially in the axial direction, is formed on the stator 11 per coil winding 16. The groove 29 helps to increase an effective magnetic air gap between the stator 11 and the rotor 12, thereby reducing the nutastast magnetic interaction between the stator 11 and the rotor 12.

FIG. 10 shows a permanent magnet motor 9, which in many aspects is similar to the permanent magnet motor explained with reference to FIG. 9. To avoid repetition, reference is therefore made to the statements there. In contrast to this, the permanent magnet motor according to FIG. 10 has two slots 29 per coil winding 16 which extend essentially in the axial direction. The above-described effect of reducing the groove can be further increased by the presence of two grooves.

The present invention is not limited to the illustrated and described embodiments. Variations within the scope of the claims are also possible as a combination of features, even if they are shown and described in different embodiments. Bezuaszeichen roll stabilizer

first stabilizer part

second stabilizer part

first stabilizer bearing

second stabilizer bearing

Stabilisatoraktor

casing

opening

Permanent magnet motor

transmission

stator

rotor

axis of rotation

Transmission input shaft

stator

coil winding

rotor core

magnetic segment

outer periphery

interface

chamfer

step

first segment part

second segment part

circumferential offset

Bags

first rotor core section

second rotor core section

groove

Claims

claims

1. stabilizer actuator (6) for relative rotation of two stabilizer parts (2, 3) of a roll stabilizer (1) with a housing (7) and a permanent magnet motor (9) arranged therein for introducing a torque, the rotatably connected to the housing (7) Stator (11) and one with respect to this about a rotation axis (13) rotatably mounted rotor (12), wherein the stator (11) in the circumferential direction a plurality of axially extending and a coil winding (16) receiving stator slots (15) and wherein the Rotor (12) in the circumferential direction has a plurality of axially extending and by a rotor core (17) carried magnetic segments (18), characterized in that the

Statornuten (15) or the magnet segments (18) for reducing a Nutrastens each have a slope (21), so that the Statornuten (15) or the magnet segments (18) in the course of their entire axial length in both the axial and in the circumferential direction of the stator (11) and / or rotor (12).

2. stabilizer actuator according to the preceding claim, characterized in that the bevel (21) is formed continuously, so that it has a to the rotation axis (13) obliquely extending, continuous pitch curve.

3. stabilizer according to the previous claim 2, characterized in that the slope of the continuous pitch curve is formed constant.

4. stabilizer according to one or more of the preceding claims 2 to 3, characterized in that the magnetic segments (18) for forming the continuous skew (21) to the rotation axis (13) are arranged obliquely on the rotor core (17) or designed as a parallelogram basic shape respectively.

5. Stabilisatoraktor according to the preceding claim 1, characterized in that the bevel (21) is stepped, so that it has a rotation axis (13) inclined, stepped gradient with at least one step (22).

6. Stabilisatoraktor according to the preceding claim 5, characterized in that the magnetic segments (18) for forming the stepped slope (21) each comprise at least two adjacent to each other in the axial direction of the segment parts (23, 24), which have a peripheral offset (25) to each other.

7. stabilizer actuator according to one of the preceding claims 1 to 6, characterized in that the magnetic segments (18) abut one another in the circumferential direction o- are spaced from each other.

8. Stabilisatoraktor according to one of the preceding claims 1 to 7, characterized in that the magnet segments (18) each with a radially inner connecting surface (20) on an outer circumference (19) of the rotor core (17) attached, in particular glued, are.

9. Stabilisatoraktor according to the preceding claim 8, characterized in that the connecting surfaces (20) of the magnet segments (18) are formed flat and the outer periphery (19) of the rotor core (17) with the planar connecting surfaces (20) has corresponding bevels.

10. Stabilisatoraktor according to the preceding claim 8, characterized in that the connecting surfaces (20) of the magnet segments (18) are concave in an end view, so that they correspond to an outer peripheral rounding of the rotor core (17).

11. Stabilizer according to one of the preceding claims 1 to 7, characterized in that the rotor core (17) in the circumferential direction a plurality of axially and / or circumferentially extending pockets (26), in which the magnet segments (18) are accommodated.

12. Stabilisatoraktor according to any one of the preceding claims 5 to 11, characterized in that the rotor core (17) for forming the stepped bevel (21) at least two mutually axially adjacent rotor core sections (27,

28) which are twisted to each other, so that the magnetic segments (18) of the both rotor core portions (27, 28) to each other have a circumferential offset (25).

13. Stabilizer according to one or more of the preceding claims 1 to 12, characterized in that the Stabilisatoraktor (6) arranged in a housing (7), in particular designed as a multi-stage planetary gear, transmission (10), which with the rotor (12) the permanent magnet motor (9) is coupled.

14. stabilizer according to one or more of the preceding claims 1 to 13, characterized in that on the stator (11) at least one substantially extending in the axial direction recess (29), in particular in the form of a groove is formed.

15. stabilizer actuator (6) for relative rotation of two stabilizer parts (2, 3) of a roll stabilizer (1) having a housing (7) and a permanent magnet motor (9) arranged therein for introducing a torque which is non-rotatably connected to the housing (7) Coil winding (16) and with respect to this about a rotation axis (13) rotatably mounted rotor (12), wherein the rotor (12) in the circumferential direction a plurality of axially extending and by a rotor core (17) carried magnetic segments (18), characterized characterized in that the coil winding (16) is ironless to avoid a Nutrastens and / or is supported radially outside of a return ring or has a self-supporting winding.

16. roll stabilizer (1) for a motor vehicle with two mutually rotatable stabilizer parts (2, 3) and a Stabilisatoraktor (6) for relative rotation of the two stabilizer parts (2, 3), characterized in that the Stabilisatoraktor (6) according to one of the preceding Claims 1 to 15 is formed.