DE102017221030A1 - Stabilizer actuator with a permanent magnet motor - Google Patents

Abstract

Proposed is a 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). stator (11) and a rotor (12) rotatably mounted with respect to this about a rotation axis (13), wherein the stator (11) in the circumferential direction a plurality of extending in the axial direction and a coil winding (16) receiving stator slots (15) and wherein the rotor (12) has in the circumferential direction a plurality of axially extending and by a rotor core (17) carried magnetic segments (18). The stator slots (15) or the magnet segments (18) each have a bevel (21) for reducing a groove, so that the stator slots (15) or the magnet segments (18) extend both axially and axially over their entire axial length extend in the circumferential direction of the stator (11) and / or rotor (12). Furthermore, the invention relates to a roll stabilizer (1) for a motor vehicle with such a stabilizer actuator (6).

Description

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 do not extend in the axial direction and in the course of their 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 of 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.

• 1 eine Prinzipdarstellung eines Wankstabilisators mit einem Stabilisatoraktor zum relativen Verdrehen von zwei Stabilisatorteilen des Wankstabilisators,
• 2 eine schematische Darstellung eines Stabilisatoraktors gemäß einem ersten Ausführungsbeispiel, bei dem Magnetsegmente am Außenumfang eines Rotorkerns angeordnet sind,
• 3 einen Rotor des in 2 dargestellten Stabilisatoraktors mit einer kontinuierlichen Schrägung,
• 4 ein weiteres Ausführungsbeispiel eines Rotors für einen Stabilisatoraktor gemäß 2, der eine gestufte Schrägung aufweist,
• 5 ein zweites Ausführungsbeispiel eines Stabilisatoraktors, bei dem die Magnetsegmente in den Rotorkern integriert sind,
• 6 und 7einen Rotor für den Stabilisatoraktor gemäß 5, bei dem mehrere Rotorkernabschnitte zueinander verdreht sind, und
• 8 eine Spulenwicklung für einen Stabilisatoraktor, die eine selbsttragende Wicklung aufweist,
• 9 eine schematische Darstellung eines Stabilisatoraktors gemäß einem weiteren Ausführungsbeispiel, bei dem am Stator in Axialrichtung verlaufende Nuten ausgebildet sind,
• 10 eine schematische Darstellung eines Stabilisatoraktors gemäß einem weiteren Ausführungsbeispiel, bei dem am Stator in Axialrichtung verlaufende Nuten ausgebildet sind.

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

• 1 a schematic representation of a roll stabilizer with a stabilizer actuator for relative rotation of two stabilizer parts of the roll stabilizer,
• 2 a schematic representation of a stabilizer according to a first embodiment, are arranged in the magnetic segments on the outer circumference of a rotor core,
• 3 a rotor of in 2 illustrated stabilizer actuator with a continuous skew,
• 4 a further embodiment of a rotor for a stabilizer according to 2 that has a stepped slope,
• 5 A second embodiment of a stabilizer actuator, in which the magnet segments are integrated in the rotor core,
• 6 and 7 a rotor for the stabilizer according to 5 in which a plurality of rotor core sections are rotated relative to each other, and
• 8th a coil winding for a stabilizer actuator having a self-supporting winding,
• 9 FIG. 2 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, FIG.
• 10 a schematic representation of a stabilizer according to another embodiment, in which the stator in the axial direction extending grooves are formed.

1 shows a simplified schematic diagram of a roll stabilizer 1 , In this roll stabilizer 1 it is an active roll stabilizer 1 , by means of which a torque can be activated actively by appropriate control. The present roll stabilizer 1 is intended for a motor vehicle. The roll stabilizer 1 includes two stabilizer parts 2 . 3 that are rotatable to each other. Furthermore, the roll stabilizer includes 1 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 presently not shown construction and / or subframe. In the area of their free ends are the two stabilizer parts 2 . 3 coupled with a suspension, not shown here.

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

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

The permanent magnet motor comprises a stator 11 and a rotor 12 , The stator 11 is arranged radially outside. Furthermore, this is non-rotatable with the housing 10 connected. The rotor 12 is relative to the stator 11 arranged radially inside. Furthermore, the rotor is rotatably mounted about a rotation axis 13. For this purpose, the permanent magnet motor 9 Preferably, two not shown here bearings, over which the rotor 12 on a carrier of the permanent magnet motor 9 or directly on the housing 7 is rotatably mounted. The rotor 12 is with a transmission input shaft 14 of the transmission 10 connected. Preferably, the transmission input shaft forms 14 a sun gear of the transmission 10 ,

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 includes, as already mentioned above, the radially inner rotor 12 that is about the axis of rotation 13 is rotatably mounted. Furthermore, the permanent magnet motor comprises 9 the radially outer stator 11 , The stator 11 has a plurality of stator slots in the circumferential direction 15 on, for reasons of clarity, only one is provided with a reference numeral. The stator grooves 15 extend in the axial direction of the permanent magnet motor 9 , Furthermore, the permanent magnet motor comprises 9 a coil winding 16 , This coil winding 16 forms at least one coil. The coil winding is in the stator slots 15 over the entire circumference of the stator 11 distributed.

How out 2 shows, includes the rotor 12 a rotor core 17 and several magnet segments 18 , The magnet segments 18 be from the rotor core 17 carried. Furthermore, the magnet segments 18 over the entire circumference of the rotor core 17 spread out. The magnet segments 18 extend in the axial direction of the permanent magnet motor 9 , According to the present embodiment, the magnet segments 18 spaced apart in the circumferential direction. Alternatively, it is also conceivable that these abut each other in the circumferential direction. Furthermore, the magnet segments 18 according to 2 on an outer circumference 19 of the rotor core 17 attached. For this purpose, the magnet segments 18 each with a radially inner connecting surface 20 on the outer circumference 19 of the rotor core 17 glued.

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

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

3 shows the rotor 12 of in 2 shown permanent magnet motor 9 according to a first embodiment. Hereinafter, the magnet segments 18 to reduce a Nutrastens each a skew 21 on. In consequence of this skew 21 the magnet segments extend 18 in the course of their entire axial length in both the axial direction and in the circumferential direction of the rotor 12 , Advantageously, this can be a cogging of the permanent magnet motor 9 be reduced. The skew 21 is in the in 3 illustrated embodiment formed continuously. This means that a slope gradient of the skew 21 has a slope over the entire axial length. As a result, the magnetic segments run 18 obliquely to the axis of rotation 13 , How out 3 shows the slope of this continuous gradient is constant. Accordingly, the skew represents 21 a straight line. To this continuous skew 21 form the magnetic segments 18 provided with a designed as a parallelogram basic shape. As a result, their longitudinal sides extend obliquely to the axis of rotation 13 , Alternatively, the magnet segments could 18 but also be rectangular and to form the continuous skew to the axis of rotation 13 twisted and thus obliquely on the rotor core 17 be attached.

4 shows an alternative embodiment of the rotor 12 for a permanent magnet motor 9 according to the in 2 illustrated embodiment. Also in this case, the magnetic segments 18 of the rotor 12 a skew 21 on. The magnet segments 18 extend as a result of this skew 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 , Unlike the in 3 illustrated embodiment is the skew 21 however, trained graduated. As a result, the skew indicates 21 one to the axis of rotation 13 sloping and stepped gradient course. The slope curve has according to the in 4 illustrated embodiment, a stage 22 on. Alternatively, however, could also several such stages 22 form the stepped slope course. Only in the area of at least one level 22 the gradient has a slope. In the areas of the magnet segment adjacent to the step 18 the slope curve has a slope of zero.

To this stepped skew 21 To be able to train include the magnet segments 18 according to 4 in each case at least two mutually adjacent in the axial direction of the segment parts 23 . 24 , In the present case, each of the magnet segments comprises 18 two of these segment parts 23 . 24 , Wherein more than two of these segment parts is a magnet segment 18 could train. The segment parts 23 . 24 extend exclusively in the axial direction. This means that their propagation in the circumferential direction over the length of the rotor 12 not changed. The segment parts 23 . 24 are therefore formed as rectangles. To the stepped skew 21 form the two adjacent to each other in the axial direction of the segment parts 23 . 24 , which together the respective magnet segment 18 form, circumferentially offset from one another. As a result, these have one another by a winkelbeschreibbaren circumferential offset 25 on. This circumferential offset 25 forms a step 22 the stepped gradient course of the skew 21 out.

5 shows a second embodiment of the permanent magnet motor 9 for the in 1 illustrated roll stabilizer 1 , In the following description of this alternative permanent magnet motor 9 be used for features compared to those in 2 shown in their embodiment and / or mode of action are identical or at least 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 magnet segments 18 not on the outer circumference 19 of the rotor core 17 are arranged, but instead are integrated into these. So includes the rotor core 17 according to the in 5 illustrated embodiment, several pockets 26 of which, for reasons of clarity, only one is provided with a reference numeral. The bags 26 are in the circumferential direction of the rotor core 17 distributed. In each of these bags 26 is a magnet segment 18 added.

6 and 7 show the rotor 12 for the in 5 shown permanent magnet motor 9 according to a first embodiment. After that, the bags extend 26 only in the axial direction. This means that they are in Are formed substantially rectangular. As a result, their dimensions change in the circumferential direction in the axial direction of the rotor 12 Not. To form a stepped skew, the rotor core comprises 17 however, several rotor core sections 27 . 28 , In the present case, the rotor core comprises 17 four such rotor core sections 27 . 28 of which, for reasons of clarity, however, only two are provided with a reference numeral. These rotor core sections 27 . 28 are mutually, especially in the same direction, twisted. As a result, therefore, the respective magnetic segments 18 the respective rotor core sections 27 . 28 twisted each other so that they have a circumferential offset 25 respectively. As a result, the in 6 and 7 illustrated rotor 12 as well as in 4 illustrated rotor 12 a stepped skew 21 on. The rotor core sections 27 . 28 can be glued together.

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

8th shows a coil winding 16 to avoid a groove. This can be used as an alternative to the preceding embodiments. After that is the coil winding 16 Ironless trained. According to the present in 8th illustrated embodiment, the coil winding 16 a self-supporting winding on. Accordingly, the coil winding needed 16 according to the present in 8th illustrated embodiment, no support member, such as the stator mentioned in the preceding embodiments 11 , Alternatively, the coil winding could 16 in a presently not shown embodiment but also be borne by a radially outer yoke ring.

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

How out 9 shows, includes the rotor 12 a rotor core 17 and several magnet segments 18 , The magnet segments 18 be from the rotor core 17 carried. Furthermore, the magnet segments 18 over the entire circumference of the rotor core 17 spread out. The magnet segments 18 extend in the axial direction of the permanent magnet motor 9 , At the stator 11 is per coil winding 16 in each case a recess in the form of a groove 29 formed, which extends substantially in the axial direction. The groove 29 Helps to create an effective magnetic air gap between the stator 11 and rotor 12 to increase, thereby causing the cogging magnetic interaction between the stator 11 and rotor 12 is reduced.

10 shows a permanent magnet motor 9 which in many aspects is based on 9 explained permanent magnet motor equals. To avoid repetition, reference is therefore made to the statements there. Deviating from the permanent magnet motor according to 10 per coil winding 16 two grooves each 29 which extend substantially 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.

LIST OF REFERENCE NUMBERS

1

roll stabilizer

2

first stabilizer part

3

second stabilizer part

4

first stabilizer bearing

5

second stabilizer bearing

6

Stabilisatoraktor

7

casing

8th

opening

9

Permanent magnet motor

10

transmission

11

stator

12

rotor

13

axis of rotation

14

Transmission input shaft

15

stator

16

coil winding

17

rotor core

18

magnetic segment

19

outer periphery

20

interface

21

chamfer

22

step

23

first segment part

24

second segment part

25

circumferential offset

26

Bags

27

first rotor core section

28

second rotor core section

29

groove

Claims (16)

Stabilizer actuator (6) for relatively rotating 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 which has a stator (7) connected to the housing (7) in a rotationally fixed manner. 11) and a rotor (12) rotatably mounted relative to the latter about an axis of rotation (13), the stator (11) having in the circumferential direction a plurality of stator slots (15) extending in the axial direction and receiving a coil winding (16), and 12) has in the circumferential direction a plurality of axially extending and by a rotor core (17) carried magnetic segments (18), characterized in that the stator (15) or the magnetic segments (18) for reducing a Nutrastens each have a skew (21), so that the stator (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) un d / or rotor (12) extend. Stabilizer according to the preceding claim, characterized in that the bevel (21) is formed continuously, so that it has an axis of rotation (13) obliquely extending, continuous pitch curve. Stabilizer actuator after the previous one Claim 2 , characterized in that the slope of the continuous pitch curve is formed constant. Stabilizer actuator according to one or more of the previous Claims 2 to 3 , characterized in that the magnet segments (18) for forming the continuous bevel (21) to the rotation axis (13) are arranged obliquely on the rotor core (17) or have a basic shape designed as a parallelogram. Stabilizer actuator after the previous one Claim 1 , characterized in that the bevel (21) is stepped, so that it has a to the rotation axis (13) obliquely extending, stepped slope profile with at least one step (22). Stabilizer actuator after the previous one Claim 5 , characterized in that the magnet segments (18) for forming the stepped bevel (21) each comprise at least two adjacent to each other in the axial direction of segment parts (23, 24) having a circumferential offset to each other (25). Stabilizer actuator according to one of the previous Claims 1 to 6 , characterized in that the magnet segments (18) abut each other in the circumferential direction or are spaced from each other. Stabilizer actuator according to one of the previous Claims 1 to 7 , characterized in that the magnet segments (18) each with a radially inner connecting surface (20) on an outer periphery (19) of the rotor core (17) attached, in particular glued, are. Stabilizer actuator after the previous one Claim 8 , characterized in that the connecting surfaces (20) of the magnet segments (18) are flat and the outer periphery (19) of the rotor core (17) with the planar connecting surfaces (20) has corresponding bevels. Stabilizer actuator after the previous one 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). Stabilizer actuator according to one of the previous Claims 1 to 7 , characterized in that the rotor core (17) in the circumferential direction has a plurality of extending in the axial and / or circumferential direction pockets (26) in which the magnet segments (18) are accommodated. Stabilizer actuator according to one of the previous Claims 5 to 11 , characterized in that the rotor core (17) for forming the stepped bevel (21) at least two to each other in Axially adjacent rotor core sections (27, 28) comprise, which are mutually rotated, so that the magnetic segments (18) of the two rotor core sections (27, 28) to each other have a circumferential offset (25). Stabilizer actuator according to one or more of the previous Claims 1 to 12 , characterized in that the stabilizer actuator (6) in the housing (7) arranged, in particular designed as a multi-stage planetary gear, transmission (10) which is coupled to the rotor (12) of the permanent magnet motor (9). Stabilizer actuator according to one or more of the previous 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. 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 which has a coil winding (2) connected in a rotationally fixed manner to the housing (7). 16) and a rotor (12) rotatably mounted relative to the latter about a rotation axis (13), the rotor (12) having in the circumferential direction a plurality of magnet segments (18) extending in the axial direction and carried by a rotor core (17), characterized in that the coil winding (16) is ironless in order to avoid a groove and / or is borne radially outside by a return ring or has a self-supporting winding. Roll stabilizer (1) for a motor vehicle with two mutually rotatable stabilizer parts (2, 3) and a stabilizer actuator (6) for relative rotation of the two stabilizer parts (2, 3), characterized in that the stabilizer actuator (6) according to one of the preceding Claims 1 to 15 is trained.

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