DE102005006699A1 - Electromagnetic brake for electric drive motor, has armature disk pressed by magnetic field strength of cuff-shaped permanent magnet against spring strength, where radial cross sectional dimension of magnet is less than its axial dimension - Google Patents

Abstract

The brake has a brake body (3) connected with a stator of an electric drive and with an armature disk (12). The disk has outer and inner rings and is pressed by magnetic field strength of a cuff-shaped permanent magnet (4) against the strength of a spring at the body. Radial cross sectional dimension of the brake force producing magnet (4) is less than its axial dimension, in which the magnet is arranged between the rings.

Description

The The invention relates to an electromagnetic brake for a in particular electric drive, with at least one brake body, at least a permanent magnet, at least one electromagnet with a electromagnetic exciter coil, designed as an outer ring outer pole and having an inner pole formed as an inner pole, wherein the brake body rotatably especially with the stand a preferably electric drive - directly or indirectly - connected is, as well as with an anchor disc, which with the rotatable shaft of the Drive - directly or indirectly - non-rotatable is connected, wherein the armature disc with the outer pole and with the inner pole as well as with the permanent magnet over an air gap forms a magnetic circuit and wherein the armature disc by the magnetic force of the permanent magnet against the force of a Spring attractable to the brake body or pressable is and the electromagnet with energized exciter coil, the permanent magnetic field of the permanent magnet at least as far compensated, neutralized, repressed or deflects that the armature disc can be lifted by spring force from the brake body or lifted off.

such Electromagnetic brakes are widely known and are available everything for used electric drives, where they serve as holding brakes in servomotors can be thought of. The electromagnetic brake must be able to drive in electric tension-free state without play and rest torque-free, and the drive in an emergency from a certain speed at a certain moment of inertia decelerate. With the help of such an electromagnetic brake, which is also referred to as a permanent magnet brake, a braking torque can be generated that while the life of the brake varies as little as possible.

To it is hitherto known to provide an annular disk-shaped, axially acting permanent magnet, its magnetic field in the region of the inner pole and the outer pole emerges vertically from the armature disk. This creates normal magnetic attractions in the area of the inner pole and the outer pole on the armature disk. About one flowing in the exciter coil Current, the electromagnet acts on the magnetic circuit of brake body and Anchor plate. In de-energized state of the electrical exciter coil There is no air gap. When electricity is supplied, the field becomes of the permanent magnet lifted by the electromagnet and the For example, formed as a leaf spring return spring pulls the armature disk away from the pole.

by virtue of The installation situation is intended to include the electromagnetic brake their cross section does not exceed the cross section of the drive, but optionally, the brake should even be integrated into the motor housing be. Thereby and by the disc-shaped design of the permanent magnet the braking torque is limited, because to increase the radial expansion would have of the annular disc-shaped Perma nentmagneten be enlarged, which is not usually due to the available installation space possible is.

It There is therefore the task of an electromagnetic brake of to create the aforementioned type, which virtually no increase in its cross-section or diameter or optionally even with reduced diameter or cross section a higher one Torque or braking torque as possible over the overall life of the brake results.

to solution this seemingly contradictory Task is the initially defined electromagnetic brake thereby in that the radial cross-sectional dimension of the braking force generating Permanent magnet between its inner diameter and its outer diameter smaller as its axial dimension. This results in a Permanent magnet whose radial ring cross-section smaller than his axial expansion, which is thus practical for increasing the magnetic force be increased arbitrarily that means the expansion of the permanent magnet can be increased in the axial direction without the cross-sectional or diameter dimension of the brake to enlarge. at best results in an axial extension the brake, but this can also be avoided if the permanent magnet saves space between inner pole and outer pole is arranged. Practically, under narrowest use of a geometric predetermined outer diameter or outside diameter a multiple torque compared a known electromagnetic brake with a ring-shaped permanent magnet be achieved.

The permanent magnet can be sleeve-shaped between the outer ring and inner ring of the brake body and radially magnetized and the outer pole and the inner pole can be arranged in particular in a plane. This radial arrangement of the permanent magnet and the geometrically equal height, not reset Innenpolanordnung the inner ring and the outer ring result in an increased, for example, double or even multiple torque due to an increased or enlarged magnetic surface and a uniform starting from wearing both poles. Because of both poles a uniform and complete friction surface is available, the brake according to the invention allows a largely constant torque over its life.

The axial dimension of the permanent magnet can its radial cross-sectional thickness, so the difference between its inner diameter and its outer diameter, several times, especially more than three times, especially something five times up to fifteenfold, preferably exceed about ten times or some other intermediate value. So it can be a "permanent magnet sleeve" relatively large axial Dimension to be provided simultaneously in the radial direction between outer ring and inner ring or outer pole and inner pole little space needed so that outer ring and inner ring form correspondingly large braking surfaces can, without a larger radial Dimension of the brake effect.

Of the Permanent magnet can face away from the braking surface with its front side about flush with the outer ring and / or inner ring of the brake body his and the electromagnet can with his exciter coil in particular between the opposite, inner end face of the permanent magnet and the armature may be disposed near the braking surface (s). Also this carries helping to ensure that the radial dimension of the brake while still increasing torque stay the same or even be downsized.

to Generation of the force acting on the armature disc spring force can at least a tension spring and / or a prestressed and riveted or bolted Segment spring for generating the axial restoring force on the armature disk, in particular several arranged on the circumference concentric with the shaft Anchor plate arranged tension springs or segment springs provided be in one of the armature disc in the axial direction with respect to their axial Adjustment limiting flange is / are arranged on the the side facing away from the permanent magnet of the armature disc relative to the shaft stands up radially. The flange thus also forms the stop for the Anchor disc, if this by the return springs of the braking surface respectively from the inner pole and the outer pole withdrawn is because the electromagnet is energized.

there can the containing the tension springs or acting as segment springs Flange connected to a sleeve rotatably connected to the shaft, in particular in one piece be connected and the anchor plate may be on the outside this sleeve rotatably, but be arranged axially adjustable about the air gap. Thus, the entire brake can be constructed on this sleeve with the flange and be pushed onto the drive shaft or the drive shaft can in this sleeve be plugged to the brake with the drive in the direction of rotation connect to. It then only has the brake body with the stator of the Drive bolted to install the brake.

to Connection of the brake body, in particular of its inner ring, with a fixed part, preferably with the stator or housing of the electric drive, can Fixing screws may be provided, in particular parallel to the central axis of the brake or the shaft and thus also of the sleeve-shaped permanent magnet are arranged. Across from the screw known in previous such brake assemblies with the outer ring is achieved by attaching the fixing screws on the inner ring advantageously a noticeable tension through the mounting screws avoided, leaving the two with the anchor plate or brake disc interacting poles a more precise position relative to each other in maintain a common level and retain, resulting in a clearer and better distribution of the braking torque over the life of the brake results. The attachment of the brake body with on the inner ring radially inwardly of the permanent magnet attacking mounting screws So has a very significant beneficial significance.

Of the sleeve- or cuff-shaped Permanent magnet can between outer ring and inner ring thereby be sure that the outer ring with the interposition of the permanent magnet with the inner ring Shrinkage is connected. The inventive radial arrangement of the permanent magnet between inner ring or inner brake body and outer ring or brake outer body and also The anchor plate can thus be fixed and realized by that the cold inner ring with the still non-magnetic radially acting Permanent magnets pre-assembled and then in the example on 300th Degrees Celsius heated outer ring inserted or this outer ring pushed over the permanent magnet becomes. After cooling of the outer ring are then this, the permanent magnet and the inner ring firmly together connected, at the same time a slightest air gap between outer ring and inner ring and permanent magnet can be ensured. It creates a cost-effective, permanent connection.

there Is it possible, that the permanent magnet of individual circumferentially next to each other arranged segments consists. This is especially true when the Fixing by shrinkage takes place, so that the individual segments thereby their relative position relative to each other can no longer lose.

A Modification of the brake according to the invention can provide that the brake body in the area of the exciter coil of the exciter magnet a brake pad having. As a result, the brake can also be used as an emergency stop brake become.

there can the brake pad between the outer ring and the inner ring the electromagnet arranged and flush with the armature disk facing faces of the outer ring and the inner ring, so the outer pole and the inner pole, be, so that there is a correspondingly large braking surface.

By the inventive radial Arrangement of the permanent magnet or its sleeve-shaped design is another enlargement of the Rotational or braking torque at steady or even reduced Diameter possible, the at cheap Conditions can go up to doubling this torque. These Embodiment of the invention may be that at both End faces of the approximately sleeve-shaped and / or arranged permanent magnets in each case an electromagnet and an armature disc are provided, wherein the armature discs opposite to each other from opposite side respectively against a restoring force to the brake body dressable or pressable are. The sleeve-shaped permanent magnet according to the invention So allows the utilization of its two end faces in interaction with internal poles and external poles the shape that practically two brakes in a single brake arise. A single permanent magnet can be used simultaneously with two Anchor disks interact, albeit correspondingly two electromagnets are provided with excitation coils, by their energization of the permanent magnetic field of the permanent magnet at its respective end face compensated, neutralized, repressed or can be deflected that the respective anchor plate means Spring force of the brake body lifted or withdrawn becomes. As in this way on the same brake body two armature discs as Brake discs can be used, the brake or torque at a constant or even reduced diameter considerably enlarged or almost doubled.

there can cooperate with two armature discs brake body its outside at least one fastening projection or radially projecting outer ring having attachment points for connection to the drive or its stand. Thus, even such a "double brake" in a simple manner be connected to a drive, although the end face of the inner ring or the outer ring for the Attack of a fixing screw is not available.

For both Anchor disks can on their sides facing away from each other a flange limiting its axial adjustability may be provided, in particular in each case with one with the shaft of the drive rotation connected sleeve connected is. Thus, you can two pods with the flanges facing away from each other take the brake between them and be pre-assembled into a single entity, which then merges with the wave of the Drive and the housing or stand can be connected.

A especially functional and advantageous embodiment of the invention may consist in that the spatial Arrangement of the permanent magnet in the axial direction between the Anchor plate and the excitation coil is provided. This promotes the magnetic flux, because it passes more directly through the permanent magnet between the poles can. this leads to to a higher one Rewind voltage of the excitation coil, which also provides an improvement in the temperature behavior of the brake is enabled.

there it is still appropriate, if the sleeve-shaped permanent magnet in the radially outer region the exciter coil or its housing is arranged. The bigger the Radius of the permanent magnet is, the larger also this permanent magnet even.

Especially when combining individual or several of the features and measures described above results in an electromagnetic brake, in which the frictional force in the region of the inner pole and the outer pole is evenly distributed, so that the recoverable torque or the achievable braking force from the beginning can have the desired size , which can be amplified or considerably reinforced by the radially arranged or sleeve-shaped permanent magnet depending on its axial dimension. In addition, the sleeve-shaped arrangement of the permanent magnet allows it to act simultaneously on two opposing armature or brake discs, whereby the braking force can be further increased and almost doubled with a favorable arrangement and execution, without in the radial direction, an increase in the brake is required , In this case, this radial or sleeve-shaped arrangement and design of the permanent magnet allows a modified and improved interface, for example, to the motor bearing plate on which the brake can be screwed without distortion. Due to the higher magnetic force of the sleeve-shaped permanent magnet, which may be correspondingly increased in the axial direction, although a higher electrical power to the excitation coil of the electromagnet or is required, but it has been shown that this electrical power of the coil relative to the increase of the rotary or Braking torque drops compared to conventional solutions. Advantageously, it is possible with the brake according to the invention with respect to known brake torque equal to reduce the size or to achieve a higher braking force with the same size, so that the brake according to the invention also has a significant economic advantage.

below are exemplary embodiments the invention described in more detail with reference to the drawing. It shows in partly schematized representation:

1 a longitudinal section of an electromagnetic brake according to the invention with an outer pole formed as an outer ring and formed as an inner ring inner pole, between which a sleeve-shaped permanent magnet is arranged, whose radial cross-sectional thickness is considerably smaller than the axial dimension,

2 a longitudinal section through a portion of an electric drive motor, wherein an approximately 1 corresponding brake is arranged on the shaft of this drive motor and connected to its stator via its bearing plate,

3 a modified embodiment in which both end faces of the outer ring and the inner ring due to a sleeve-shaped permanent magnet arranged between them cooperate as braking surfaces, each with an armature disc, and

4 a modified embodiment in longitudinal section analogous to the 1 However, wherein the sleeve-shaped permanent magnet seen in the axial direction between the armature disc and the exciting coil is arranged.

One in total with 1 designated electromagnetic brake is for a in 2 partially illustrated electric drive 2 thought and has a brake body 3 on, a permanent magnet 4 , at least one electromagnet 5 with an electromagnetic exciter coil 6 one as outer ring 7 trained outer pole and one as inner ring 8th trained inner pole includes. You can see in 1 and 4 even those from above with the exciter coil 6 connected strand or a plug 9 , which in the representation after 2 can be seen in the lower area.

The brake body 3 is according to 2 rotationally fixed over the end shield 10 with the stand or housing 11 of the electric drive 2 connected in a manner to be described.

According to 1 . 2 and 4 belongs to this electric brake 1 an anchor disc 12 that with the rotatable shaft 13 of the drive 2 indirectly, namely about a sleeve to be described 14 and a flange disposed thereon 15 , rotatably connected, the armature disc 12 with the outer pole 7 and with the inner pole 8th as well as with the permanent magnet 4 forms a magnetic circuit via an air gap not visible in the drawings and wherein the armature disc 12 by the magnetic force of the permanent magnet 4 against the force of feathers also to be described 16 to the brake body 3 or its outer ring 7 and outer ring 8th the front side can be pulled or pressed. Is the exciter coil 6 of the electromagnet 5 not energized, so the braking force is effective. By energizing the exciter coil, the permanent magnetic field of the permanent magnet 4 as far as compensated, neutralized, displaced or deflected, that the anchor plate 12 by means of spring force of the springs 16 from the brake body 3 or the end faces of the outer ring 7 and the inner ring 8th can be lifted or lifted off. If the power fails, so will the brake 1 closed.

In the embodiments, according to the 1 to 4 provided that the radial cross-sectional dimension or cross-sectional thickness of the permanent magnet 4 , So the dimension between its inner diameter and its outer diameter is smaller than its axial dimension. It can be seen clearly in the figures that this radial cross-sectional dimension or cross-sectional thickness d relative to the axial length of the permanent magnet 4 low is that means the permanent magnet 4 can be increased in the axial direction without the circumference or cross section or diameter of the brake 1 becomes larger, so that the magnetic force without such a cross-sectional enlargement can be increased. In this case, the axial dimension of the permanent magnet exceeds 4 its radial cross-sectional thickness d several times and that in the embodiments about three times or four times or ten times, but also a smaller or larger relation of these dimensions can be selected depending on the desired magnetic force.

The permanent magnet 4 is thus sleeve-shaped between the outer ring 7 and inner ring 8th of the brake body 3 arranged while radially magnetized to over the outer ring 7 and the inner ring 8th with the anchor disc 12 to form a magnetic circuit, wherein for the accommodation of the permanent magnet 4 the spatial extent of inner ring 7 and outer ring 8th can be exploited to the effect that the permanent magnet 4 within the space required by them.

According to 1 and 2 is the permanent magnet 4 with his with the anchor plate 12 cooperating braking surface facing away from the front side 17 approximately flush with the corresponding end faces of the outer ring 7 and the inner ring 8th of the brake body 3 and the electromagnet 5 is with his exciter coil 6 between the opposite, inner end face 18 of the permanent magnet 4 and the anchor plate 12 arranged near the or the braking surfaces. In this way, the electromagnet 5 with energized exciter coil 6 the permanent magnetic field of this sleeve-shaped permanent magnet 4 as far as compensate, neutralize, displace or deflect that anchor plate 12 by means of the force of the springs 16 from the brake body 3 lifted, so the brake 1 is ventilated.

To generate the on the anchor plate 12 acting spring force are leaf spring-shaped segment springs 16 preloaded and with the flange 15 riveted and concentric with the shaft around the circumference 13 or to the anchor plate 12 provided so that the flange 15 has an additional function by using these segment springs 16 receives. In addition, this flange limits 15 the axial movement of the armature disk 12 from the brake body 3 away and stands on the permanent magnet 4 opposite side of the armature disk 12 opposite the wave 13 radially high.

It can be seen in all embodiments that the tension springs 16 or the flange acting as such segment springs 15 with the wave 13 in use position rotatably connected sleeve 14 is integrally connected and the anchor plate 12 on the outside of this sleeve 14 rotatably, but is arranged axially adjustable ver to the air gap. This results in a total of a compact brake 1 , which can be pre-assembled, then with the shaft 13 and the drive 2 to be connected.

According to 1 and 2 are to connect the brake body 3 and thereby advantageously its inner ring 8th with a fixed part, in the embodiment with the end plate 10 of the electric drive 2 mounting screws 18 provided parallel to the center axis of the brake and the shaft 13 and the sleeve-shaped permanent magnet 4 are arranged. Thus, a virtually stress-free attachment of the brake 1 inside the case 11 of the electric drive 2 possible, that is, serving as the braking surfaces end faces of the outer ring 7 and the inner ring 8th keep despite the bolting of the brake 1 their plane position within a common plane and can be correspondingly well with the serving as a brake disc anchor plate 12 interact.

Looking at 1 and 3 is clearly visible that the sleeve or cuff-shaped permanent magnet 4 with its inner and outer surfaces parallel to each other, each of the inner ring 8th and the outer ring 7 touched and therefore between outer ring 7 and inner ring 8th can be fixed by the fact that the outer ring 7 with the interposition of the permanent magnet 4 with the inner ring 8th is connected by shrinking. Practically, the inner ring 8th with the sleeve-shaped permanent magnet 4 provided and then heated, for example, to 300 ° C outer ring 7 attached or the inner ring 8th with the permanent magnet 4 in this heated outer ring 7 inserted or inserted, after which the three parts - if the outer ring 7 has cooled - are firmly connected and there is no need for additional fastening measures.

In this case, the permanent magnet 4 also consist of individual, circumferentially juxtaposed segments.

In a manner not shown, the brake body 3 in the field of exciter coil 6 of the electromagnet 5 between the outer ring 7 and the inner ring 8th still have a brake pad, while in the embodiments at this point a gap is released. This gap could be filled with a brake pad, if the braking surface is to be used for example as an emergency stop brake or dynamic brake.

In such a case, the brake pad between the outer ring 7 and the inner ring 8th on the electromagnet 5 flush with the anchor plate 12 facing end faces of the outer ring 7 and the inner ring 8th be to have a total continuous, radially extending braking surface.

This in 1 illustrated principle of an electromagnetic brake 1 is also in the embodiment 3 realized, but designed to the effect that at both ends 17 and 18 the approximately sleeve-shaped and / or arranged permanent magnet 4 one electromagnet each 5 and one anchor plate each 12 are provided, wherein the armature discs 12 in opposite directions to each other from opposite sides in each case against one of springs 16 caused restoring force to the brake body 3 can be pulled or pressed. 3 shows practically two of the 1 corresponding brakes, which are arranged as it were mirror-symmetrical to each other, but these then the sleeve-shaped permanent magnet 4 have in common with its radial cross-section thickness significantly surpassing axial dimension in common. Practically arises opposite 1 a brake 1 , which correspond to two each other gengesetzten pages each have an anchor disc 12 with a corresponding braking surface, causing the brake 1 an increase in the braking torque, wherein the braking torque can be almost doubled under certain circumstances with respect to a brake 1 to 1 and 2 if the anchor disks 12 have matching dimensions.

You can see in 3 that with two armature discs 12 cooperating brake body 3 on its outside at least one fastening projection, in this embodiment, a radially projecting outer ring 19 with attachment points 20 , For example, perforations or threaded holes, for connection to the drive 2 or its housing or stand 11 having.

Furthermore one recognizes in 3 that for both armature discs 12 at their sides facing away from each other one of their axial adjustability limiting flange 15 is provided, each with one with the shaft 13 of the drive 2 rotatably connectable sleeve 14 in particular is integrally connected. This results in two with their flanges 15 facing away from each other facing sleeves 14 , whose inner openings are aligned with each other, so that a continuous shaft 13 can be coupled with it.

In 4 is opposite 1 and 2 with regard to the arrangement of the permanent magnet 4 modified embodiment shown. It can be seen that the spatial arrangement of the permanent magnet 4 in this embodiment in the axial direction between the armature disc 12 and the exciter coil 6 is provided. At the same time it can be seen that this sleeve-shaped or composed of segments permanent magnet 4 while in the radially outer region of the exciter coil 6 or its housing is arranged, so has the largest possible diameter. Moreover, the characteristics of the permanent magnet and its attachment to those of the above embodiments match.

This direct arrangement of the permanent magnet 4 in the axial direction between the armature disk 12 and the exciter coil 6 improves the magnetic flux, because this can be done more directly, which also leads to an increased re-tightening voltage of the exciting coil 6 leads. This can improve the brake 1 in their temperature behavior and, for example, use of the brake 1 up to - 30 ° C.

The electromagnetic brake 1 for a particular electric drive 2 has a brake body 3 on, the sleeve-shaped permanent magnet 4 , one with an excitation coil 6 provided electromagnet 5 , an outer ring designed as outer pole 7 and an inner ring formed as an inner pole 8th includes, one rotatable with a shaft 13 connected anchor plate 12 with the permanent magnet 4 forms a magnetic circuit via an air gap and by the magnetic force of the permanent magnet 4 against the force of reset springs 16 to the brake body 3 or the end faces of the outer ring 7 and the inner ring 8th dressable or pressable. With energized exciter coil 6 becomes the permanent magnetic field of the permanent magnet 4 so far compensated, neutralized, displaced or deflected that the anchor plate 12 by spring force from the brake body 3 liftable or lifted and thereby the brake 1 is ventilated. The radial cross-sectional dimension or cross-sectional thickness of the permanent magnet 4 , So the difference between its inner diameter and its outer diameter is smaller, in particular considerably smaller than its axial dimension, that is, the axial dimension, for example, exceed this cross-sectional thickness more than three times or five times, for example, about ten times too large. Thereby, the magnetic force can be increased by a corresponding increase in the axial dimension, without the outer cross section or outer diameter of the brake 1 to enlarge.

Claims (16)

Electromagnetic brake ( 1 ) for a particular electric drive ( 2 ), with at least one brake body ( 3 ), the at least one permanent magnet ( 4 ), at least one electromagnet ( 5 ) with an electromagnetic exciter coil ( 6 ), as an outer ring ( 7 ) formed outer pole and one as an inner ring ( 8th ) formed inner pole, wherein the brake body ( 3 ) rotatably especially with the stand ( 11 ) of a preferably electric drive ( 2 ), as well as with an anchor plate ( 12 ), with the rotatable shaft ( 13 ) of the drive ( 2 ) is rotatably connected, wherein the armature disc ( 12 ) with the outer pole and with the inner pole and with the permanent magnet ( 4 ) forms a magnetic circuit via an air gap and wherein the armature disk ( 12 ) by the magnetic force of the permanent magnet ( 4 ) against the force of a spring ( 16 ) to the brake body ( 3 ) is attractable or pressable and the electromagnet ( 5 ) with energized exciting coil ( 6 ) the permanent magnetic field of the permanent magnet ( 4 ) at least as far as compensated, neutralized, displaced or deflected, that the armature disc ( 12 ) by spring force from the brake body ( 3 ) is lifted off or lifted off, characterized in that the radial cross-sectional dimension or cross-sectional thickness of the permanent magnet generating the braking force ( 4 ) between its inner diameter and its outer diameter smaller than its axial dimension solution is. Brake according to claim 1, characterized in that the permanent magnet ( 4 ) sleeve-shaped between outer ring ( 7 ) and inner ring ( 8th ) of the brake body ( 3 ) is arranged and radially magnetized. Brake according to claim 1 or 2, characterized in that the axial dimension of the permanent magnet ( 4 ) exceeds its radial cross-sectional thickness (d) several times, in particular by more than three times, in particular by about five times to fifteen times, preferably by about ten times or another intermediate value. Brake according to one of claims 1 to 3, characterized in that the permanent magnet ( 4 ) with its side facing away from the braking surface ( 17 ) approximately flush with the outer ring ( 7 ) and / or inner ring ( 8th ) of the brake body ( 3 ) and that the electromagnet ( 5 ) with its exciting coil ( 6 ) in particular between the opposite, inner end face of the permanent magnet ( 4 ) and the anchor plate ( 12 ) is arranged near the or the braking surfaces. Brake according to one of claims 1 to 4, characterized in that for generating the on the armature disc ( 12 ) acting spring force at least one tension spring ( 16 ) and / or a prestressed and riveted or bolted segment spring, in particular several on the circumference concentric with the shaft ( 13 ) arranged anchor plate ( 12 ) arranged tension springs ( 16 ) and / or segment springs are provided in one of the armature disc ( 12 ) in the axial direction with respect to their axial adjustability limiting flange ( 15 ) is arranged on the the permanent magnet ( 4 ) facing away from the armature disk ( 12 ) opposite the shaft ( 13 ) stands up radially. Brake according to one of claims 1 to 5, characterized in that the tension springs ( 16 ) or as such acting segment springs containing flange ( 15 ) with one with the shaft ( 13 ) rotatably connected sleeve ( 14 ), in particular integrally connected and the armature disc ( 12 ) on the outside of this sleeve ( 14 ) non-rotatably, but is arranged axially adjustable about the air gap. Brake according to one of claims 1 to 6, characterized in that for the connection of the brake body, in particular its inner ring ( 8th ), with a fixed part, preferably with the stator of the electric drive, fastening screws ( 18 ) are provided, in particular parallel to the central axis of the brake ( 1 ) or the wave ( 13 ) are arranged. Brake according to one of claims 1 to 7, characterized in that the sleeve or sleeve-shaped permanent magnet ( 4 ) between outer ring ( 7 ) and inner ring ( 8th ) is fixed by the fact that the outer ring ( 7 ) with the interposition of the permanent magnet ( 4 ) with the inner ring ( 8th ) is connected by shrinkage. Brake according to one of claims 1 to 8, characterized in that the permanent magnet ( 4 ) consists of individual circumferentially juxtaposed segments. Brake according to one of claims 1 to 9, characterized in that the brake body ( 3 ), in particular in the region of the exciter coil ( 6 ) of the electromagnet ( 5 ) has a brake pad. Brake according to one of claims 1 to 10, characterized in that the brake lining between the outer ring ( 7 ) and the inner ring ( 8th ) on the electromagnet ( 5 ) and flush with the anchor plate ( 12 ) facing end faces of the outer ring ( 7 ) and the inner ring ( 8th ). Brake according to one of claims 1 to 11, characterized in that on both end faces ( 17 . 18 ) of the approximately sleeve-shaped or cuff-shaped and / or arranged permanent magnet ( 4 ) one electromagnet each ( 5 ) and one anchor plate each ( 12 ) are provided, wherein the armature discs ( 12 ) in opposite directions to each other from opposite sides against a restoring force to the brake body ( 3 ) are attractable or pressable. Brake according to claim 1 or 12, characterized in that the with two armature discs ( 12 ) cooperating brake body ( 3 ) on its outside at least one fastening projection or radially projecting outer ring ( 19 ), in particular with attachment points ( 20 ) for connection to the drive ( 2 ) or its stand ( 11 ) having. Brake according to one of the preceding claims, characterized in that for two armature discs at their opposite and from a common permanent magnet ( 4 ) facing away from each one of their axial adjustability limiting flange ( 15 ), which in particular in each case with one with a shaft ( 13 ) of the drive ( 2 ) rotatably connectable sleeve ( 14 ) connected is. Brake according to one of claims 1 to 3 or 5 to 11, characterized in that the spatial arrangement of the particular sleeve-shaped or cuff-shaped permanent magnet ( 4 ) in the axial direction between the armature disc ( 12 ) and the exciter coil ( 6 ) is provided. Brake according to one of the preceding claims, characterized in that the permanent magnet ( 4 ) in the radially outer region of the exciter coil ( 6 ) or its housing is arranged.