Electromagnetically actuatable brake and electric machine having electromagnetically actuatable brake

Abstract

The invention relates to an electromagnetically actuatable brake, in which a brake pad carrier of the brake is connected to a shaft in a rotationally fixed manner, the brake pad carrier is arranged so as to be movable in the axial direction relative to the shaft, and an armature disc of the brake is connected to a magnetic body of the brake in a rotationally fixed manner, the armature disc is arranged to be movable in the axial direction, a first annular magnet is arranged on a bearing cover of the electric machine, a second annular magnet is arranged on the armature disc, and a third magnetic annular magnet is received in the brake pad carrier.

Description

Technical Field

[0001] The invention relates to an electromagnetically actuable brake and an electric motor having an electromagnetically actuable brake. Background Art

[0002] As is known, brake motors have a motor with a brake, where the brake is engaged when activated and released when released.

[0003] A brake is known from DE 1020 10 049 744 A1 as the closest prior art.

[0004] DE 10 2010 049 747 A1 discloses a kit for producing different electric machines in a motor configuration.

[0005] An electric motor is known from DE 10 2010 049 748 A1. Summary of the Invention

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to enable the operation of a brake motor with the greatest possible safety.

[0007] According to the invention, this object is achieved by a brake according to the features of claim 1 and an electric machine according to the features of claim 14 .

[0008] In an electromagnetically actuable brake, in particular an electromagnetically actuable brake for an electric motor, the present invention is characterized in that:

[0009] wherein a brake shoe carrier of the brake is connected to the shaft in a rotationally fixed manner and is arranged to be movable relative to the shaft in an axial direction, i.e. in particular in a direction parallel to the axis of rotation of the shaft;

[0010] wherein the armature disc of the brake is connected to the magnetic body of the brake in a relatively non-rotatable manner, wherein the armature disc is arranged to be movable in the axial direction;

[0011] The first annular magnet is arranged on the bearing cover of the motor.

[0012] The second annular magnet is arranged on the armature disc.

[0013] In this case, a third magnetic ring magnet, in particular magnetized in the axial direction, is accommodated in the brake shoe carrier.

[0014] This has the advantage of ensuring safe operation of the brake motor. This is because when the brake is engaged, the armature disc is pulled axially away from the brake pad carrier, thereby retracting the brake pad carrier and its brake pad from the braking surface in frictional contact with the brake pad. The annular magnets enable the brake pad carrier to be axially aligned between the bearing cap and the armature disc. The magnetic repulsion between the first annular magnet and the third annular magnet closest to the first annular magnet, as well as the magnetic repulsion between the second annular magnet and the third annular magnet closest to the second annular magnet, assists in disengaging the brake pad carrier and its brake pad from the braking surface formed on the bearing cap.

[0015] It is also particularly important that the brake shoe carrier is axially spaced apart quickly, efficiently and sufficiently safely by means of the magnetic body when the brake is released.

[0016] The radial direction and the circumferential direction are always referred to the axis of rotation of the shaft; the axial direction is parallel to the direction of the axis of rotation of the shaft.

[0017] In an advantageous design, a respective one of the third annular magnets is respectively accommodated on both axial sides of the brake shoe carrier.

[0018] In particular, it is received in a corresponding annular groove of the brake shoe carrier. The advantage here is that the brake shoe carrier is not interrupted in the radial direction by the third annular magnet and can therefore be implemented as an integral body.

[0019] In an advantageous embodiment, the first annular groove, the second annular groove, and / or the two third annular grooves are arranged coaxially with respect to one another and / or, in particular, at the same radial distance relative to the axis of rotation of the rotor shaft. This has the advantage that the brake pad carrier can be precisely centered between the first annular magnet and the second annular magnet.

[0020] In an advantageous embodiment, the magnetization direction of the respective third ring magnet is opposite to the magnetization direction of the immediately adjacent further ring magnets, in particular when the further ring magnets are the first and second ring magnets. This has the advantage that the third ring magnet is repelled by its immediately adjacent ring magnets.

[0021] In an advantageous embodiment, the second annular magnet is received in an annular recess of the armature disk and / or is materially bonded to the armature disk, in particular adhesively bonded. This has the advantage that production is simple and cost-effective. The recess can be embodied as an annular groove or formed in a brake shoe carrier embodied as a plastic injection-molded part.

[0022] In an advantageous embodiment, the ring axis of the first ring magnet is aligned coaxially with the axis of rotation of the shaft. This has the advantage that the brake shoe carrier is easier to center.

[0023] In an advantageous embodiment, the second ring magnet is received in an annular recess of the armature disc and / or is materially connected to the armature disc, in particular adhesively connected. This has the advantage that no additional space needs to be provided for the ring magnet.

[0024] In an advantageous embodiment, the ring axis of the first ring magnet is aligned coaxially with the axis of rotation of the shaft. This has the advantage that the brake shoe carrier is less susceptible to tilting, thus ensuring trouble-free operation.

[0025] In an advantageous embodiment, the ring axis of the second ring magnet is aligned coaxially with the axis of rotation of the shaft. This has the advantage that the brake shoe carrier is less susceptible to tilting, thus ensuring trouble-free operation.

[0026] In an advantageous embodiment, the third annular magnets are each at the same radial distance from the axis of rotation of the shaft and / or are each arranged at the same axial position. This has the advantage that, due to the magnetic repulsion between the third annular magnets, the brake pad carrier can be centered as precisely as possible between the two annular magnets. This is because the respective third annular magnet, on its side facing the first annular magnet, has the same magnetic pole type, e.g., a north pole, as the first annular magnet on its side facing the third annular magnet. Similarly, the respective third annular magnet, on its side facing the second annular magnet, has the same magnetic pole type, e.g., a south pole, as the second annular magnet on its side facing the respective third annular magnet.

[0027] In an advantageous embodiment, the radial extents covered by the third ring magnets are identical to one another, and / or the areas covered by the third ring magnets in the axial direction are identical to one another. Advantageously, all third ring magnets have the same radial position.

[0028] In an advantageous embodiment, the first ring magnet is magnetized in the axial direction.

[0029] The second annular magnet is magnetized in the axial direction.

[0030] The third ring magnets are magnetized in the opposite direction to the axial direction.

[0031] In an alternative advantageous embodiment, the first ring magnet is magnetized opposite to the axial direction.

[0032] The second annular magnet is magnetized in the opposite direction to the axial direction.

[0033] The third annular magnet is magnetized axially. This has the advantage that the third annular magnet, arranged axially between the two annular magnets, is repelled by them and thus positioned centrally. When the brake is released, the spring element pushes the armature disc away from the magnetic body. The armature disc then presses the brake pad carrier toward the bearing cap. Simultaneously, the magnetic repulsion between the third annular magnet and the first and second annular magnets is overcome, and the brake pads arranged axially on both sides of the brake pad carrier are pressed against their respective braking surfaces. Specifically, the first brake pad is pressed against the first braking surface, and the second brake pad is pressed against the second braking surface.

[0034] In an advantageous embodiment, the third ring magnets are each arranged in a corresponding recess extending through the brake shoe carrier in the axial direction and / or are materially connected to the brake shoe carrier, in particular adhesively bonded. This has the advantage of enabling a quick and simple construction method without requiring additional installation space.

[0035] In an advantageous embodiment, the web region stamped and / or formed on the brake shoe carrier at least partially surrounds the third ring magnet and thus axially delimits it. This has the advantage that, in particular, a positive-locking axial fixation is additionally achieved.

[0036] In an advantageous embodiment, the brake shoe carrier has brake shoes on both axial sides.

[0037] The brake pad is arranged radially outside the third, first, and / or second annular magnets. Consequently, the radial distance covered by the brake pad carrier is radially spaced from the radial distance covered by the respective annular magnet. This has the advantage of generating a high friction torque.

[0038] In an advantageous embodiment, the first annular magnet is designed to be continuous in the circumferential direction, in particular with reference to the axis of rotation of the shaft. This has the advantage of enabling simple assembly. Furthermore, regardless of the rotational position of the brake pad carrier, the brake pad carrier can be axially centered in a position intermediate between the first and second annular magnets.

[0039] In an additional or alternative embodiment, the second annular magnet is designed to be continuous in the circumferential direction, in particular with respect to the axis of rotation of the shaft. This has the advantage of enabling simple assembly. Furthermore, the brake pad carrier can be axially centered between the first and second annular magnets, regardless of the rotational position of the brake pad carrier.

[0040] In an advantageous embodiment, the coil winding is arranged in the magnetic body, in particular in an annular recess in the magnetic body, in particular the winding axis of the coil winding is aligned coaxially with the axis of rotation of the shaft.

[0041] Among them, the spring element supported on the magnetic body presses on the armature disc,

[0042] wherein a first braking surface is formed on the bearing cap on the side of the brake pad carrier facing the brake pad carrier, or a friction lining is connected to the bearing cap, which friction lining provides the first braking surface on the side of the brake pad carrier facing the brake pad carrier,

[0043] In particular, the armature disc provides a second braking surface on its side facing the brake pad carrier. This has the advantage that, in the event of a power failure, the brake automatically engages because the spring force generated by the spring element presses the armature disc toward the brake pad carrier and, in turn, presses the armature disc against the first braking surface formed on the bearing cap. Only when the coil winding is energized does the magnetic attraction acting on the armature disc overcome the spring force generated by the spring element, causing the armature disc to move toward the magnetic body and, in turn, release the brake pad carrier from the braking surface. In this case, especially when the brake pad carrier is released, the magnetic repulsion between the third annular magnet and the other annular magnets provides additional support.

[0044] In an advantageous embodiment, the shaft passes through a notch in the magnetic body and is connected to the fan in a rotationally fixed manner on the side of the magnetic body facing away from the armature disk. Advantageously, this allows for simple heat dissipation of the magnetic body and thus the brake.

[0045] In an advantageous embodiment, the brake comprises a plate which is rotatably supported on the magnetic body. Advantageously, manual release is achieved.

[0046] In an advantageous embodiment, the radial range covered by the third ring magnet overlaps or is identical to the radial range covered by the first ring magnet. This has the advantage that the brake pad carrier can be magnetically centered in the axial direction. This is because the third ring magnet is preferably arranged at the same radial position as the other ring magnets. This results in a sufficiently strong repulsive force.

[0047] In an advantageous embodiment, the radial extent covered by the third ring magnet overlaps with or is identical to the radial extent covered by the second ring magnet.

[0048] In particular, the third ring magnet is arranged in the axial direction between the first ring magnet and the second ring magnet. This has the advantage that centering in the axial direction is achieved magnetically.

[0049] In an advantageous embodiment, the brake shoe carrier has an internal toothing which is placed onto the external toothing of the annular carrier.

[0050] Wherein, the entrainer is connected with the shaft in a mode that cannot rotate relative to each other--especially by means of a key connection. Advantage is that the brake shoe carrier is connected with the entrainer in a mode that cannot rotate relative to each other, but is arranged to be axially movable at the same time.

[0051] An important feature of the electric motor with the above-described brake is that the shaft is the rotor shaft of the electric motor.

[0052] In particular, the floating bearing is received in the bearing cap, the inner ring of the floating bearing is sleeved on the shaft, and the outer ring of the floating bearing is received in the bearing cap.

[0053] Among them, the bearing cover is connected to the stator housing of the motor.

[0054] On the side of the stator housing facing away from the bearing cap, a bearing flange is connected to the stator housing and accommodates a fixed bearing, which, together with a floating bearing, rotatably supports the shaft. This has the advantage that the floating bearing is accommodated within the bearing cap, allowing compensation for thermally induced length changes in the shaft. Furthermore, to compensate for length changes, the brake pad carrier is movably arranged on the shaft or on the driver.

[0055] Further advantages are provided by the dependent claims. The present invention is not limited to the feature combinations of the claims. Other suitable combinations of the claims and / or features of individual claims and / or features of the description and / or features of the drawings will appear to a person skilled in the art, particularly based on the objectives presented and / or from a comparison with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Here, the present invention is explained in more detail with reference to the schematic diagram:

[0057] Figure 1 A longitudinal section through an electric machine according to the invention with an electromagnetically actuatable brake is shown.

[0058] Figure 2 Zoomed in to show Figure 1 Part of the.

[0059] Figure 3 A longitudinal section through a second electric machine according to the invention with an electromagnetically actuatable brake is shown.

[0060] Figure 4 Zoomed in to show Figure 3 Part of the.

[0061] List of reference numerals:

[0062] 1 bearing

[0063] 2 Rotor shaft

[0064] 3 keys

[0065] 4 driving parts

[0066] 5. First ring magnet

[0067] 6 Rod magnets

[0068] 7 Brake pad carrier

[0069] 8 Second ring magnet

[0070] 9 Armature plate

[0071] 10 Magnetic body

[0072] 11 Coil winding

[0073] 12 Release lever

[0074] 13 panels

[0075] 14 Fan

[0076] 15 bearing cap

[0077] 30 Ring Magnet DETAILED DESCRIPTION

[0078] like Figure 1 and Figure 2 As shown, the electric machine has a rotatably mounted rotor shaft 2 which is rotatably mounted by means of a bearing 1 which is accommodated in a bearing shield 15 .

[0079] The bearing 1 is preferably embodied as a floating bearing.

[0080] The bearing cover is connected to the stator housing, which is connected on its side facing away axially from the bearing cover 15 to a bearing flange in which a further bearing, in particular a fixed bearing, is accommodated for rotatable mounting of the rotor shaft 2 .

[0081] An annular carrier 4 is mounted on the rotor shaft 2 and is fixedly connected to the rotor shaft 2 by means of a key 3. The carrier 4 has an external toothing, onto which a brake shoe carrier 7 with an internal toothing is mounted. Thus, the brake shoe carrier 7 is fixedly connected to the carrier 4 but is movable axially relative to the rotor shaft 2.

[0082] The brake pad carrier 7 is provided with brake pads on both sides of the axial direction.

[0083] An armature disc 9 is arranged on the side of the brake pad carrier 7 axially facing away from the bearing cover 15. The armature disc is connected to the magnetic body 10 in a manner that is fixed in rotation relative to each other, but is movable in the axial direction. To this end, pins are preferably fixed on or in the magnetic body, each of which extends through a corresponding notch in the armature disc 9, so that the armature disc 9 is arranged so as to be fixed in rotation relative to the magnetic body 10, but to be movable in the axial direction.

[0084] The magnetic body 10 is connected to the bearing cover 15. An annular recess is arranged in the magnetic body 10, and a coil winding 11 that can be energized is received in the annular recess.

[0085] The coil winding 11 is preferably designed as a toroidal winding, wherein the toroidal axis of the toroidal winding is aligned coaxially with the axis of rotation of the rotor shaft 2 .

[0086] The armature disk 9 is arranged axially between the magnetic body 10 and the brake shoe carrier 7 .

[0087] The anchor disk 9 is preferably made of a ferromagnetic material.

[0088] A spring element, in particular an annular spring, supported on the magnetic body 10 presses against the armature disk 9 .

[0089] Therefore, when the coil winding 11 is energized, the armature plate 9 overcomes the elastic force generated by the spring element and is attracted toward the magnetic body 10 .

[0090] When the coil winding 11 is de-energized, the spring element presses the armature disc 9 against the brake pad carrier, in particular against the brake pad arranged on the side of the brake pad carrier facing the armature disc, so that the brake pad carrier, in particular the brake pad arranged on the side of the brake pad carrier facing away from the armature disc, is pressed against the braking surface formed on the bearing cover 15, in particular a surface-ground braking surface, or against the friction plate fixed on the bearing cover 15 and arranged axially between the bearing cover and the brake pad carrier on its side facing away from the armature disc 9.

[0091] The magnetic body 10 and the armature disk 9 each have a centrally arranged recess, through which the rotor shaft 2 is passed.

[0092] The fan wheel is preferably connected to the rotor shaft 2 in a rotationally fixed manner on the side of the magnetic body 10 facing away axially from the anchor disk 9 .

[0093] Furthermore, a plate 13 is provided which is rotatably supported on the magnetic body 10. The rotational position of the plate 13 can be adjusted by means of a release lever 12 which is fixedly connected to the plate 13. A pull rod can be driven axially by the plate 13 and passes through the magnetic body 10 and the armature plate 9. When the pull rod moves axially, the armature plate 9 is also pulled axially by the pull rod, because the pull rod widens in its end region facing away from the plate 13 and thus axially limits the armature plate 9.

[0094] Likewise, by widening the end region of the pull rod passing through the plate 13, facing away from the armature disk 9, an axial limitation of the plate 13 is achieved. This means that the brake can be manually released even in power-off operation.

[0095] The armature disk 9 is arranged axially between the brake shoe carrier 7 and the magnetic body 10 .

[0096] When the coil winding 11 is energized, the armature disc 9 overcomes the elastic force generated by the spring element and is attracted to the magnetic body 10. In this way, the brake shoe carrier 7 is separated from the braking surface or friction plate on the bearing cover 15 and can be moved in the axial direction, thereby releasing the brake.

[0097] In order to assist the disengagement of the brake pad carrier 7 when the coil winding 11 is energized, and at the same time position the brake pad carrier as centrally as possible in the axial center between the armature disk 9 and the braking surface arranged on the friction plate and the bearing cover 15, a first annular magnet 5 is arranged on the bearing cover 15, in particular on the side of the bearing cover 15 axially facing the brake pad carrier, and a second annular magnet 8 is arranged on the side of the armature disk 9 facing the brake pad carrier 7.

[0098] The ring axis of the first ring magnet 5 is aligned coaxially with the rotation axis of the rotor shaft 2. The first ring magnet 5 is magnetized in the axial direction, in particular such that it has a south pole on its side facing the brake pad carrier 7.

[0099] The ring axis of the second ring magnet 8 is aligned coaxially with the rotation axis of the rotor shaft 2. The second ring magnet 8 is magnetized in the axial direction, in particular such that it has a south pole on its side facing the brake pad carrier 7.

[0100] The two ring magnets 5 , 8 have, in particular, the same ring diameter; ie, they are preferably of the same size.

[0101] Bar magnets 6 are accommodated in the brake shoe carrier 7 , which are magnetized in the axial direction so that they each have a south pole on their side facing the bearing cover 15 and a north pole on their side facing the armature disk 9 .

[0102] In this case, the bar magnets 6 are spaced apart from one another in the circumferential direction, in particular regularly spaced apart from one another in the circumferential direction.

[0103] All bar magnets 6 are arranged at the same radial distance from the rotation axis of the rotor shaft 2 .

[0104] The radial range covered by the bar magnet 6 overlaps with the radial range covered by the first ring magnet 5 and with the radial range covered by the second ring magnet 8 .

[0105] The rod magnet 6 is axially spaced apart from both the first ring magnet 5 and the second ring magnet 8. Preferably, the rod magnets are at the same distance from the respective ring magnets 5, 8.

[0106] The bar magnet 6 is immovably arranged in the brake shoe carrier 7. The bar magnet 6 is preferably connected to the brake shoe carrier 7 by a material-locking connection, in particular by adhesive bonding. Alternatively or additionally, however, a form-locking connection is also advantageous, wherein for this purpose, tabs are formed, in particular stamped out, on the brake shoe carrier, which at least partially surround the bar magnet and secure it at least axially.

[0107] The bar magnet 6 is preferably arranged radially inside the brake shoe. The brake shoe is therefore arranged as far as possible radially outside the brake shoe carrier 7.

[0108] When the coil winding 11 is energized, the magnetic attraction force acting on the armature disk 9 is preferably at least ten times greater than the magnetic repulsion force of the first ring magnet 5 on the rod magnet 6 .

[0109] The coil winding 11 is preferably accommodated in a coil former which is preferably made of plastic, in particular is embodied as a plastic injection-molded part, wherein the coil former together with the coil winding 11 is accommodated in a cup-shaped or annular recess of the magnetic body 10 .

[0110] The second annular magnet 8 is received in an annular recess of the bearing cap 15. If no friction lining is provided, a finely machined annular surface is formed on the bearing cap radially outside the second annular magnet 8, which serves as a braking surface on the side of the bearing cap 15 facing the brake pad carrier 7. Alternatively, if a friction lining is provided, it is preferably punched from a metal sheet into a perforated plate.

[0111] In other embodiments of the present invention, the rotor shaft 2 is provided with an external toothing instead of the driver 4, and the brake shoe carrier 7 is mounted on the rotor shaft with its internal toothing. Therefore, the driver 4 together with the key 3 can be omitted.

[0112] In accordance with Figure 3 and Figure 4In the embodiment of FIG, annular magnets 30 are arranged on both axial sides of the brake shoe carrier 7 instead of the bar magnets 6. Each annular magnet is received in an annular groove of the brake shoe carrier 7.

[0113] The two ring magnets 30 are axially spaced apart from one another and are preferably oriented coaxially with one another. The ring axis of the respective ring magnet 30 is therefore oriented coaxially with the axis of rotation of the rotor shaft 2 .

[0114] The magnetization direction of the respective ring magnet 30 is opposite to the magnetization direction of the respective closest fixed ring magnet 5 , 8 .

[0115] The ring magnets 5 and 8 are preferably likewise oriented coaxially with respect to the ring magnet 30. In particular, all ring magnets 5, 8, 30 are arranged at the same radial distance.

[0116] The brake pad carrier 7 is preferably not produced from a single sheet metal, but rather as a one-piece component, in particular a one-piece component, in particular a plastic component.

[0117] The annular groove extends continuously in the circumferential direction.

[0118] In other embodiments according to the present invention, the third annular magnet 30 is not arranged in a corresponding annular groove of the brake shoe carrier 7 , but is bonded to a corresponding plane, in particular a corresponding end face, of the brake shoe carrier 7 .

Claims

1. An electromagnetically actuated brake, in particular for an electric motor, The brake shoe carrier of the brake is connected to the shaft in a rotationally fixed manner, and the brake shoe carrier is arranged to be movable relative to the shaft in an axial direction, that is, in particular in a direction parallel to the rotation axis of the shaft; The armature disc of the brake is connected to the magnetic body of the brake in a non-rotatable manner, and the armature disc is arranged to move in the axial direction. It is characterized in that The first annular magnet is arranged on the bearing cover of the motor, The second annular magnet is arranged on the armature disc, A third magnetic, in particular axially magnetized, ring magnet is accommodated in the brake shoe carrier.

2. The brake according to claim 1, characterized in that A respective one of the third annular magnets is respectively accommodated on both axial sides of the brake shoe carrier, in particular in a respective annular groove of the brake shoe carrier.

3. Brake according to any one of the preceding claims, characterized in that The first annular groove, the second annular groove and / or the two third annular grooves are arranged coaxially with respect to one another and / or in particular at the same radial distance relative to the axis of rotation of the rotor shaft.

4. Brake according to any one of the preceding claims, characterized in that The magnetization direction of the respective third ring magnet is opposite to the magnetization direction of the nearest adjacent ring magnet among the other ring magnets, in particular the first ring magnet and the second ring magnet.

5. Brake according to any one of the preceding claims, characterized in that The second annular magnet is received in an annular recess of the armature disk and / or is connected to the armature disk in a materially bonded manner, in particular adhesively bonded.

6. Brake according to any one of the preceding claims, characterized in that The ring axis of the first ring magnet is oriented coaxially with the axis of rotation of the shaft, and / or, The ring axis of the second ring magnet is aligned coaxially with the axis of rotation of the shaft.

7. Brake according to any one of the preceding claims, characterized in that The third ring magnets are spaced apart from each other in the axial direction and are spaced apart from the first ring magnet and the second ring magnet, and / or, the ring magnets, ie in particular the first ring magnet, the second ring magnet and the third ring magnet, each have the same radial distance from the axis of rotation of the shaft and / or are each arranged at the same radial position, and / or, The radial ranges covered by the first, second and third annular magnets are the same as each other, and / or the areas covered by the first, second and third annular magnets in the radial direction are the same as each other.

8. Brake according to any one of the preceding claims, characterized in that The first ring magnet is magnetized in the axial direction, The second ring magnet is magnetized in the axial direction, The third annular magnet is magnetized in the opposite direction to the axial direction. or, The first ring magnet is magnetized in the opposite direction to the axial direction. The second ring magnet is magnetized in the opposite direction to the axial direction. The third ring magnets are magnetized in the axial direction, respectively.

9. Brake according to any one of the preceding claims, characterized in that The radial range covered by the brake pad carrier includes the radial range covered by the third annular magnet, and / or, The third ring magnet is connected to the brake shoe carrier in a materially bonding manner, in particular in an adhesive bond.

10. Brake according to any one of the preceding claims, characterized in that The brake pad carrier has brake pads on both sides of the axial direction. The brake shoe is arranged radially outside the third ring magnet, the first ring magnet and / or the second ring magnet.

11. Brake according to any one of the preceding claims, characterized in that The first ring magnet is designed to be uninterrupted in the circumferential direction, in particular with reference to the axis of rotation of the shaft, and / or, The second ring magnet is designed to be uninterrupted in the circumferential direction, in particular with reference to the axis of rotation of the shaft.

12. Brake according to any one of the preceding claims, characterized in that The coil winding is arranged in the magnetic body, in particular in an annular recess of the magnetic body, in particular with a winding axis of the coil winding being oriented coaxially with the rotation axis of the shaft; A spring element supported on the magnetic body presses against the armature disc; A first braking surface is formed on the bearing cap on a side facing the brake pad carrier, or a friction plate is connected to the bearing cap, the friction plate providing the first braking surface on a side facing the brake pad carrier; In particular, the armature disk provides a second braking surface on its side facing the brake pad carrier.

13. Brake according to any one of the preceding claims, characterized in that The shaft passes through the notch of the magnetic body and is connected to the fan on a side of the magnetic body that is axially away from the armature disc in a non-rotatable manner. and / or, The brake has a plate member rotatably supported on the magnetic body portion; and / or, The radial range covered by the third annular magnet overlaps with or is the same as the radial range covered by the first annular magnet; and / or, The radial range covered by the third annular magnet overlaps with or is the same as the radial range covered by the second annular magnet; In particular, the third ring magnet is arranged between the first ring magnet and the second ring magnet in the axial direction.

14. Brake according to any one of the preceding claims, characterized in that The brake shoe carrier has an inner toothing which is mounted on the outer toothing of the annular carrier. The carrier is connected to the shaft in a rotationally fixed manner, in particular by means of a key connection.

15. An electric machine having an electromagnetically actuatable brake according to any one of the preceding claims, characterized in that The shaft is the rotor shaft of the motor, and / or, The floating bearing is received in the bearing cover, the inner ring of the floating bearing is sleeved on the shaft, and the outer ring of the floating bearing is received in the bearing cover. The bearing cover is connected to the stator housing of the motor. On the side of the stator housing facing away from the bearing cover, a bearing flange is connected to the stator housing and receives a fixed bearing which, together with a floating bearing, rotatably supports the shaft.

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