DE102012019415A1 - Electromotor for use with redundant brake assembly system, has end shield connected with housing portion, and electromagnetic actuated brakes arranged on respective sides of end shield, where axial side of end shield is placed on stator - Google Patents

Abstract

The electromotor has an end shield (1) connected with a housing portion and/or a stator (29). The end shield receives a bearing (2) of a rotor shaft (3). First and second electromagnetic actuated brakes are mounted on the end shield. The first electromagnetic actuated brake is arranged on a first side of the end shield. A turned axial side of the end shield is placed on the stator. The second electromagnetic actuated brake is arranged on another side of the end shield. The brakes are provided with an electromagnet.

Description

The invention relates to an electric motor, in particular with a redundant brake arrangement.

From the DE 10 2010 049 748 is known in a brake motor to equip an electric motor with an electromagnetically actuated brake, in particular as a B-side mounted brake.

The invention is therefore based on the object to increase the safety in a system.

According to the invention, the object is achieved in the electric motor according to the features indicated in claim 1.

Important features of the invention in the electric motor, in particular with a redundant brake arrangement, are that the electric motor has a bearing plate which is connected to a housing part and / or the stator of the electric motor,
wherein the end shield receives a bearing of the rotor shaft of the electric motor,
wherein a first and a second respectively electromagnetically operable brake is mounted on a bearing plate of the electric motor,
wherein the first brake is arranged on a first side of the end shield,
in particular arranged on the stator facing the axial side of the bearing plate,
and the second brake is arranged on the other side of the bearing plate,
is arranged in particular on the side facing away from the stator axial side of the bearing plate.

The advantage here is that a redundantly operable brake system is provided and thus the safety can be increased. Here, the first brake in the engine compartment and the second brake is installed as a mounting brake. Both brakes are attached to the end shield of one of the bearings of the rotor shaft. Thus, an assembly of both brakes to the bearing plate executable and then connect this bearing plate with the stator or the remaining motor housing.

In an advantageous embodiment, each brake in each case has an electromagnet and an axially movably arranged, circumferentially positively playful or play-free arranged armature disc which is axially moved in energizing the electromagnet to the respective electromagnet against the spring force of a respective spring element and which in Nichtbestromung of the electromagnet is pressed by the respective spring element on a brake pad carrier, which is thus pressed onto a braking surface, in particular a friction disc. The advantage here is that in case of failure of the power supply, the brake automatically falls because the anchor slide is pressed by at least one spring element against the lining carrier, which is thus pressed onto the friction disc.

In an advantageous embodiment of the lining carrier of the first and / or the second brake is axially movable, but rotatably connected to the rotor shaft of the electric motor or with a driver part which is rotatably connected to the rotor shaft, connected,
in particular wherein the lining carrier has an internal toothing which engages with external toothing of the rotor shaft or of the driver part,
in particular wherein the driver part is connected by means of a feather key connection with the rotor shaft. The advantage here is that the lining carrier is arranged axially displaceably on the driver part and thus can be pressed by the armature disk on the friction disk. The teeth of the toothing thus preferably extend only in the axial direction.

In an advantageous embodiment, the internal toothing and / or the external toothing is an involute toothing. The advantage here is that the production is easy to carry out, since a widespread Verzahnungsart is selectable.

In an advantageous embodiment, a spring element is arranged between the internal toothing and / or external toothing for game reduction or game suppression. The advantage here is that the wear of the teeth, especially when powering the motor by a converter and frequent operation of the engine at a constant target speed, so long exposure to speed fluctuations, can be reduced.

In an advantageous embodiment, the end plate is pot-shaped, wherein the pot bottom is arranged on the side facing away from the stator side of the pot axial side. The advantage here is that a particularly compact design is achievable and the first brake axially completely or at least partially from the wall of the pot can be covered.

In an advantageous embodiment, a recess in which the bearing of the rotor shaft is received at the pot bottom of the bearing plate in a thickening of the pot bottom rising towards the stator. The advantage here is that a stable recording of the camp is predictable.

In an advantageous embodiment, at least partially axially extending air gap is arranged between bearing plate and driver part of the first brake. The advantage here is that particles of the brake wear not from the Raumberiech of Brake can move out and thus a seal is achieved.

In an advantageous embodiment, the bearing plate is held together with the housing part and / or stator of the electric motor by means of tie rods. The advantage here is that a simple inexpensive connection of the housing parts can be achieved.

In an advantageous embodiment, the magnetic body of the first brake is screw-connected to the bearing plate,
in particular, wherein the screws of the side facing away from the stator side of the bearing plate, in particular the pot bottom of the bearing plate, are screwed. The advantage here is that the first brake and the second brake on the bearing plate can be fastened. Here, the first brake is designed as a built-in brake and the second brake as a mounting brake.

In an advantageous embodiment, by means of a screw, the friction disc of the first brake via a pressure sleeve, in particular as a guide pin effective pressure sleeve, screwed to the magnetic body of the first brake,
the pressure sleeve guiding the armature slide in the axial direction,
the screw protrudes through the pressure sleeve,
in particular wherein the pressure sleeve is interposed between the friction disk and the magnetic body. The advantage here is that a simple determination of the friction to the magnetic body can be achieved, wherein the pressure sleeve additionally assumes the function of the axial guidance of the armature disk.

In an advantageous embodiment, the housing part accommodates the stator windings and has on its side facing the bearing plate a recess which is covered by a protective cap, in particular a plastic protective cap.
wherein the protective cap has a recess for the passage of the rotor shaft, wherein the protective cap is designed to be axially widened towards its smallest radial distance in order to form a gap seal towards the rotor shaft,
in particular wherein the air gap between the rotor shaft and protective cap is smaller than an average large abrasive particle falling off during braking on the friction lining,
wherein the bearing plate radially outwardly of the cap covered by the radial distance range touches the housing part and / or is connected to the housing part. The advantage here is that a cost-effective simple seal can be achieved.

In an advantageous embodiment, the rotor shaft has a shoulder, in particular therefore a circumferential edge, which is arranged axially adjacent to the axial area covered by the protective cap,
in particular for the purpose of throwing off abrasion particles before entry into the gap seal arranged between the rotor shaft and the protective cap. The advantage here is that particles are thrown off already in the space before entering the gap sealing between the protective cap and rotor shaft and thus the seal is further improved.

In an advantageous embodiment, a fan is arranged at the axial end portion of the rotor shaft whose cooling air flow is directed along the second brake and along axially extending cooling fins, wherein the cooling fins are arranged on the outside of the bearing plate, in particular are designed in one piece with the bearing plate. The advantage here is that a cooling of the brakes can be achieved in a simple manner. In particular, the bearing plate is particularly effective Entwärmbar due to the integrally molded cooling fins. Since the brakes are mounted on the bearing plate, in particular screw-connected, an effective cooling of the brakes can be achieved.

In an advantageous embodiment, a guide pin guides the armature disk in the axial direction and is screwed with its arranged in an axial end portion of the guide bolt threaded portion in a threaded bore of the magnetic body of the first brake, in particular so that the guide pin rests with a collar on the flat surface of a tapped hole Lowering on the magnetic body,
wherein the guide pin has a threaded bore into which a screw is screwed, which defines the friction disc of the first brake on the guide pin,
wherein the guide pin has an external hexagon area or hexagon area, in particular at its axial end area facing the friction plate. The advantage here is that a simple attachment of the friction disc on the magnet body is providable, which also acts as an axial guidance of the armature disk.

In an advantageous embodiment, the magnetic body has a bore into which a pressure sleeve is at least partially inserted,
wherein the friction disc is pressed by means of a screw on the pressure sleeve to the magnetic body,
wherein the pressure sleeve is arranged between the friction disc and the magnetic body. The advantage here is that a cost-effective simple attachment of the friction disc on the magnetic body is executable. In addition, the pressure sleeve is also used as an axial guide of the armature disk.

In an advantageous embodiment, an O-ring is plugged onto the pressure sleeve is provided and / or wherein an O-ring between the pressure sleeve and the armature disk is arranged. The advantage here is that the shock load of the armature disk is reduced.

Further advantages emerge from the subclaims.

The invention will now be explained in more detail with reference to figures:

In the 1 is shown a cross section through a brake motor according to the invention.

In the 2 is essentially an enlarged section of the in 1 shown cross-section, wherein instead of the screw 42 out 1 one in a guide pin 202 screwed in screw 201 is inserted and the guide pin has a hexagon socket.

In the 3 is essentially a cutout to one 2 shown in the top view.

In the 4 is essentially an enlarged section of the in 1 shown cross-section, wherein instead of the screw 42 out 1 one in a guide pin 402 screwed in screw 401 is inserted and the guide pin has an external hexagon.

In the 5 is essentially a cutout to one 4 shown in the top view.

In the 6 is essentially an enlarged section of the in 1 shown cross-section, wherein instead of the screw 42 out 1 a screw 603 in a pressure sleeve 602 is arranged, which with an O-ring 601 is sealed.

In the 7 is essentially a cutout to one 6 shown in the top view.

In the 8th is essentially an enlarged section of the in 1 illustrated cross section, wherein a protective cap 28 , in particular plastic cap, is shown in detail for sealing the engine compartment.

In the 9 is essentially one too 8th associated top view shown.

In the 10 is essentially enlarged detail for 8th shown, with the intervention of the protective cap 28 is shown in more detail.

As in 1 As shown, the motor according to the invention is designed with a redundant brake system, so that increased safety can be achieved.

This is a first camp 2 the rotor shaft 3 in a bearing plate 1 added. Another bearing of the rotor shaft 3 is on the on the rotor shaft 3 arranged rotor 32 arranged away from the axial side of the engine.

Thus, axially between the two bearings of the rotor shaft 3 the rotor 32 arranged together with rotor laminated core. Likewise, the stator lamination stack is arranged between the bearings. The stator lamination pack accommodates stator windings whose deflection regions, ie winding overhang 30 axially between the laminated stator core and the bearing 2 is arranged.

The first brake is thus on the stator facing the axial side of the bearing plate 1 arranged. The second brake is on the side facing away from the stator axial side of the bearing plate 1 arranged.

The bearing plate 1 is pot-shaped, with the camp 2 is added to the bottom of the pot. The rotor shaft 3 is passed through the pot bottom tapered and protrudes through the second brake and takes at its axial end a fan 17 on. The fan promotes a fan flow in the axial direction, in particular by means of the guidance of the air flow through the fan cowl 9 , on the cooling fins 38 along, which seen on the rotor shaft axis from the radially outer circumference of the bearing plate 1 are arranged.

To form the first brake is on the rotor shaft 3 a driver 4 attached, in particular rotatably connected. The driver 4 has at its seen from the rotor shaft axis radially outward circumference on a driver toothing.

On the driver 4 is a brake disc 37 , In particular a brake pad carrier, arranged, which has an internal toothing corresponding to the driver toothing. The brake disk has brake lining on its two axial end surfaces. Since the teeth of the toothing extend in the axial direction, ie parallel to the rotor shaft axis direction, the brake disc is axially movable but in the circumferential direction positively with the driver 4 and thus also indirectly with the rotor shaft 3 connected.

In one to the rotor 32 towards open recess of the bearing plate 1 is a magnetic body 43 added. The magnetic body is made of a cast steel, in particular GGG cast, and ferromagnetic. The executed as a ring winding brake coil 33 is in a coil carrier 31 inserted from plastic, which in turn into a likewise open towards the stator recess of the magnetic body 43 is included.

Between the brake disc 37 and the brake coil 33 is an axially movable, but rotationally fixed in the circumferential direction with the bearing plate 1 connected anchor plate 24 arranged. When energizing the brake coil 33 Therefore, the armature disc from the magnetic body 43 attracted exiting magnetic field.

Compression spring press against the magnetic force on the armature disk in the axial direction. When the brake coil is not energized 33 Therefore, the armature disc from the magnetic body 43 pushed away. This is the brake disc 37 on the friction disc 26 pressed so that the brake pads provided on both sides of the brake disc 37 Friction force to the armature disk 24 and to the friction disk 26 create.

The friction disc 26 is by means of the screw 42 to the end shield 1 screwed on, being a guide pin 25 which is the anchor plate 24 in their axial movement leads, in particular thus prevents the rotational movement.

The screw 42 is designed as a countersunk screw and presses the friction disc 26 with the screw head of the screw 42 on the guide pin 25 ,

In the circumferential direction are a plurality of equal acting, preferably circumferentially evenly spaced screws 42 and guide pins 25 arranged.

Preferably, the bobbin is 31 with brake coil 33 encapsulated by potting compound and thus not only frictionally but also cohesively with the magnetic body 43 connected.

The screw 42 is with its threaded portion in a threaded hole in the bearing plate 1 screwed. By means of the screw 41 is the magnetic body 43 with the end shield 1 screw-connected.

On the side facing away from the first brake in the axial direction of the bearing plate 1 the second brake is provided.

The second brake is also like the first brake on the end shield 1 mounted and executed as the first brake as an electromagnetically actuated brake.

For this purpose is a pin screw part 19 in a threaded hole of a friction disc 22 screwed in, which by means of an adjusting nut 18 on the magnetic body 8th is set, so that the magnetic body 8th is limited to a maximum distance in the axial direction.

By screwing the adjusting nut 18 This maximum distance can be adjusted, so that with worn brake pads, an adjustment of the air gap between the armature disc 13 the brake and brake coil is enabled.

Between the friction disc 22 and the magnetic body 8th is a pressure sleeve 16 and spring element 15 arranged, wherein the spring element 15 on the friction disc 22 supported and on the pressure sleeve 16 which in turn is supported on the magnetic body 8th ,

In the circumferential direction, in particular regularly spaced apart in the circumferential direction from each other, further pressure sleeves 16 with spring elements 15 around pin screw parts 19 arranged, in particular arranged attached to this.

At a greater radial distance than the pressure sleeves 16 and spring elements 15 is a sealing part 40 provided, thus axially between friction disc 22 and magnetic body 8th is arranged.

To form the second brake is on the rotor shaft 3 again a driver part 4 arranged and rotationally fixed, preferably by means of a spring element 5 arranged in the circumferential direction without play, wherein the driver part 4 a driver toothing 11 has, so that designed as a double disc lining carrier 12 is arranged axially movable, wherein the lining carrier 12 axially on both sides brake pads 14 are arranged. With a first brake pad 14 is when the brake coil is not energized 6 the anchor plate 13 from on the magnetic body 8th supported springs supported and the lining carrier 12 over his brake pad 14 to the friction disc 22 pressed. When energizing the brake coil 6 becomes the anchor plate 13 to the magnetic body 8th attracted and thus the lining carrier 12 released together with brake pads, so the second brake released.

At the magnetic body 8th , In particular, a ferromagnetic cast steel part, a shaft seal is disposed, in particular non-positively connected, wherein the shaft seal has two sealing lips, which seal towards the rotor shaft. In this way it is prevented that brake wear from the region of the second brake in the space region of the axial end portion of the rotor shaft 3 arranged fan 17 and thus gets into the environment.

The brake coil 6 the second brake is again designed as a ring winding and in a coil carrier 7 inserted. The annular arrangement thus formed is similar to the first brake in the magnetic body 8th inserted, so that the axially exiting from the area wrapped by the ring winding magnetic field is guided by the magnetic body and is guided around the ring winding about 180 °, so that the field introduced in comparison to the radial distance of the ring winding smaller radial distance in the axial direction in the magnetic body and on compared to the radial distance of the ring winding larger radial distance against the axial direction of the magnetic body 8th is led out.

The fan cover is releasably connected to the bearing plate, in particular screw-connected.

The driver toothings ( 11 ,) Both brakes are executable as non-helical Stirnradverzahnungen, preferably involute profile sections are used for the teeth of the toothing.

The pin screw part 19 is by the spring element 15 and also through the pressure sleeve 16 passed.

Between bearing plate 1 and friction disc 22 is an air gap except for a small annular contact area 20 arranged so that the thermal contact resistance of the friction disc 22 to the end shield 1 is enlarged.

The second brake is by means of a lever 21 be ventilated by hand. Thus, the spring force of the pressure on the anchor plate springs can be overcome without energizing the brake coil.

The housing of the electric motor is characterized by a in 1 not shown, output side, the further bearing of the rotor shaft 3 receiving end shield, the Statorblechpaket receiving and surrounding stator housing part 29 and that the camp 2 receiving end shield 1 formed by provided by passing through these three parts tie rods and means at the axial end portions of the tie rods 23 arranged nuts are set against each other.

At the to the shield 1 facing axial end portion of the stator housing 29 is a protective cap 28 , preferably made of plastic, arranged. In this way, the space area of the first brake is separated from the interior of the engine. The protective cap 28 creates such a seal that brake pad wear can not get into the engine compartment area. The rotor shaft 3 is through the protective cap 28 Centered, with the protective cap 28 one of the rotor shaft 3 facing gap sealing area 35 having. Here is the protective cap 28 to create a long axially extending gap in the axial direction at a first radial distance further expanded than at a second radial distance, wherein the second radial distance is greater than the first radial distance.

The protective cap is connected to the axial end region of the stator housing 29 non-positively and / or positively connected.

As in 9 more clearly shown, the stator housing on the stator lamination packet receiving an inner bore, at the axial end portion of the protective cap 28 is provided plugged. Here is a introduced into the inner bore section 90 the protective cap 28 deflected elastically in the radial direction and thus presses on the inner wall of the protective cap 28 receiving inner bore of the stator housing 29 ,

The protective cap 28 extends radially from the gap to the rotor shaft 3 over the radially covered area of the stator lamination stack.

Between friction disc 26 and protective cap 28 is an air gap 34 arranged so that a thermal barrier is carried out in this area, which impedes heat conduction from Raumberiech the first brake to the engine compartment area.

Between that with the rotor shaft 3 connected driver 27 and the end shield 1 is a gap 36 arranged, however, is so small that brake wear can not penetrate substantially in the engine compartment area. In addition, the rotor shaft in the region of the first brake on a paragraph, so that at the associated edge a possibly occurring brake abrasion is thrown off. The edge is axially closely adjacent to the inlet region of the rotor shaft in the bearing plate 1 ,

At the axial end of the rotor shaft facing away from the output side of the motor 3 is a fan 17 arranged, the cooling air flow from the fan cover 9 is guided and through outlet openings on the bearing plate 1 between fan cover 17 and end shield 1 emerges and then substantially axially along the axially extending cooling fins 38 , which are arranged on the outer circumference of the bearing plate, are passed.

The inside of the engine arranged inside the first brake is thus through the guide pin 25 on the magnetic body 43 pre-assembled, with the screw 42 , in particular countersunk screw, the guide pin 25 at the magnetic body 43 sets. The preassembled and thus precompleted first brake is then in the bearing plate 1 inserted and by means of the screw 41 to connect the magnetic body 43 with the end shield 1 bolted from the B side. Here, the B side is the output side of the engine axially facing away.

The next step is the protective cap 28 also pressed into the recess from the B side and connected. After installing the first brake in the engine and tightening the tie rods 23 becomes the second brake on the end shield 1 mounted, in particular with the stud bolts 19 established.

In the embodiment according to 2 and 3 is instead of the guide pin 25 and the screw 42 a guide pin 202 used, which can be screwed with a threaded portion in a corresponding internal thread of a threaded hole in the magnet body 43 , To the A-side, ie abortive side of the engine out, the guide pin has 202 a central recess in which a hexagon socket is inserted. In this way, with a hexagonal tool, the guide pin 202 in the magnetic body 43 screwed. In one in the central recess of the guide pin 202 axially deeper threaded area is a screw 201 screwed, which with its screw head, in particular countersunk screw head, the friction disc 26 on the guide pin 202 presses. For centering is a corresponding reduction in the friction disc 26 incorporated, in which the guide pin 202 is plugged in.

In the embodiment according to 4 and 5 is instead of the guide pin 25 and the screw 42 a guide pin 401 used, which can be screwed with a threaded portion in a corresponding internal thread of a threaded hole in the magnet body 43 , To the A-side, ie abortive side of the engine out, the guide pin has 401 an external hexagon. In this way, with a hexagon socket tool, the guide pin 401 in the magnetic body 43 screwed. A central recess of the guide pin 401 has a threaded area and thus is a screw 402 screwed, which with its screw head, in particular countersunk screw head, the friction disc 26 on the guide pin 401 presses. For centering is a corresponding reduction in the friction disc 26 incorporated, in which the guide pin 401 is plugged in.

In the embodiment according to 6 and 7 is instead of the guide pin 25 and the screw 42 a pressure sleeve 602 used in a corresponding hole in the magnet body 43 is plugged in, leaving a collar of the pressure sleeve 602 on a pole face of the magnetic body 43 rests. By means of the screw head, in particular countersunk screw head, the screw 603 becomes the friction disc 26 over the pressure sleeve 602 to the magnetic body 43 pressed. One on the outer circumference of the pressure sleeve 602 arranged O-ring 601 serves to dampen the impact stress of the playful leadership of the anchor plate 24 , The pressure sleeve 602 is by means of the screw 603 , in particular countersunk screw, on the magnetic body 43 pressed down, with the screw 603 in a threaded hole of the magnetic body 43 is screwed.

In the 2 to 7 has the respective guide pin or the respective pressure sleeve on a diameter jump, so that a resting of the corresponding collar is present on a plane surface corresponding to the threaded hole in the magnetic body associated reduction.

LIST OF REFERENCE NUMBERS

1

end shield

2

camp

3

rotor shaft

4

takeaway

5

Spring element for game suppression in the driver toothing 11

6

brake coil

7

coil carrier

8th

Magnetic body, in particular cast steel part

9

fan cover

10

Shaft seal

11

driver toothing

12

Pad carrier, in particular double disc pad carrier

13

armature disc

14

brake lining

15

Spring element, in particular compression spring

16

pressure sleeve

17

Fan

18

Adjusting nut for adjusting the air gap

19

Stud portion

20

air gap

21

Lever for manual release

22

friction

23

drawbars

24

armature disc

25

guide pins

26

friction

27

takeaway

28

protective cap

29

stator

30

Winding head, deflecting areas of the stator windings

31

coil carrier

32

rotor

33

brake coil

34

air gap

35

the rotor shaft facing gap sealing region of the plastic cap 28

36

Gap between drivers 27 and end shield 1

37

Brake disc, in particular lining carrier

38

cooling fins

39

coil carrier

40

sealing

41

Screw for connecting the magnetic body 43 with the end shield 1

42

Screw, in particular countersunk screw

43

magnetic body

90

elastically radially deflected portion of the protective cap 28

201

screw

202

guide pins

401

screw

402

guide pins

601

O-ring

602

pressure sleeve

603

Screw, in particular countersunk screw

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102010049748 [0002]

Claims (15)

Electric motor, in particular with a redundant brake arrangement, wherein the electric motor has a bearing plate, which is connected to a housing part and / or the stator of the electric motor, wherein the bearing plate receives a bearing of the rotor shaft of the electric motor, characterized in that a first and a second respectively electromagnetically actuated brake is mounted on a bearing plate of the electric motor, wherein the first brake arranged on a first side of the bearing plate, in particular arranged on the stator facing the axial side of the bearing plate, and the second brake is arranged on the other side of the bearing plate, in particular the side facing away from the stator axial side of the bearing plate is arranged. Electric motor according to at least one of the preceding claims, characterized in that each brake each having an electromagnet and axially movably arranged in the circumferential direction positively play or held backlash arranged armature disc which is moved axially when energizing the electromagnet in the respective electromagnet against the spring force a respective spring element and which is pressed in non-energization of the electromagnet of the respective spring element on a brake pad carrier, which is thus pressed onto a braking surface, in particular a friction disc. Electric motor according to at least one of the preceding claims, characterized in that the lining carrier of the first and / or the second brake axially movable, but rotatably connected to the rotor shaft of the electric motor or with a driver part, which is rotatably connected to the rotor shaft, connected, in particular the lining carrier has an internal toothing which engages with external toothing of the rotor shaft or the driver part, in particular wherein the driver part is connected to the rotor shaft by means of a feather key connection, and / or that the internal toothing and / or the external toothing is involute toothing, and / or a spring element is arranged between the internal toothing and / or external toothing for reducing the play or suppressing play. Electric motor according to at least one of the preceding claims, characterized in that the bearing plate is designed cup-shaped, wherein the pot bottom is arranged on the side facing away from the stator side of the pot axial side Electric motor according to at least one of the preceding claims, characterized in that the pot bottom of the bearing plate in a thickening of the pot bottom rising towards the stator is a recess in which the bearing of the rotor shaft is received. Electric motor according to at least one of the preceding claims, characterized in that between the end shield and driver part of the first brake at least partially axially extending air gap is arranged. Electric motor according to at least one of the preceding claims, characterized in that the bearing plate is held together with the housing part and / or stator of the electric motor by means of tie rods. Electric motor according to at least one of the preceding claims, characterized in that the magnetic body of the first brake is screw-connected to the bearing plate, in particular wherein the screws from the side facing away from the stator side of the bearing plate, in particular the pot bottom of the bearing plate, are screwed. Electric motor according to at least one of the preceding claims, characterized in that by means of a screw, the friction disc of the first brake via a pressure sleeve, in particular effective as a guide pin pressure sleeve, is bolted to the magnetic body of the first brake, wherein the pressure sleeve leads the anchor slide in the axial direction, wherein the screw protrudes through the pressure sleeve, in particular wherein the pressure sleeve is interposed between the friction disc and the magnetic body. Electric motor according to at least one of the preceding claims, characterized in that the housing part accommodates the stator windings and on its side facing the bearing plate has a recess which is covered by a protective cap, in particular plastic protective cap, wherein the protective cap has a recess for the passage of the rotor shaft has, wherein the Protective cap axially widened to its smallest radial distance out is to form a gap seal to the rotor shaft out, in particular wherein the air gap between the rotor shaft and protective cap is smaller than a sloping during braking on the friction lining, average size abrasive particles, the bearing plate radially outside of the protective cap Covered radial distance range touches the housing part and / or is connected to the housing part, in particular wherein the protective cap of the recess in the radial direction inwardly deflected elastic regions, so that the protective cap is held non-positively on the recess, wherein the protective cap has a paragraph, with which it is frictionally held on the housing part or the edge of the recess. Electric motor according to at least one of the preceding claims, characterized in that the rotor shaft has a shoulder, in particular a circumferential edge, which is arranged axially adjacent to the axial area covered by the protective cap, in particular for the purpose of throwing off abrasion particles before entering the rotor shaft and Protective cap arranged gap seal. Electric motor according to at least one of the preceding claims, characterized in that at the axial end portion of the rotor shaft, a fan is arranged, whose cooling air flow is directed along the second brake and along axially extending cooling fins, wherein the cooling fins are arranged on the outside of the bearing plate, in particular in one piece are executed with the end plate. Electric motor according to at least one of the preceding claims, characterized in that a guide pin guides the armature disk in the axial direction and with its in an axial end region of the guide pin ( 202 . 401 ) threaded portion is screwed into a threaded bore of the magnetic body of the first brake, in particular so that the guide pin ( 202 . 401 ) rests with a collar on the plane surface of a tapped hole on the magnetic body, wherein the guide pin ( 202 . 401 ) has a threaded bore into which a screw is screwed, which is the friction disc of the first brake on the guide pin ( 202 . 401 ), wherein the guide pin ( 202 . 401 ) has an external hexagon area or hexagon area, in particular at its axial end area facing the friction plate Electric motor according to at least one of the preceding claims, characterized in that the magnetic body has a bore into which a pressure sleeve ( 602 ) is at least partially inserted, wherein the friction disc by means of a screw on the pressure sleeve ( 602 ) is pressed towards the magnetic body, wherein the pressure sleeve ( 602 ) is arranged between the friction disc and the magnetic body. Electric motor according to at least one of the preceding claims, characterized in that an O-ring ( 601 ) on the pressure sleeve ( 602 ) and / or where an O-ring ( 601 ) between pressure sleeve ( 602 ) and armature disc is arranged.

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