ELECTRIC MOTOR DRIVE

Description

[0001] The invention relates to a drive with an electric motor.

[0002] It is generally known that a drive has an electric motor, the electric motor can be inverter-fed and the drive drives a load.

[0003] From the CN 113 922 553 A The most readily available state of the art is a drive using an electric motor.

[0004] From the DE 40 09 625 A1 A cable entry point is known.

[0005] An electric motor with a brake is known from DE 198 38 171 B4.

[0006] A rectifier for a vehicle is known from EP 0 920 111 B1.

[0007] An electrical machine is known from DE 10 2011 083 263 A1.

[0008] From EP 3 251 198 B1 an electric motor with an electromagnetically actuated brake is known.

[0009] From DE 10 2008 028 604 A1 an electric motor with electromagnetically actuated brake is known.

[0010] An electric motor with encoder is known from DE 10 2008 028 661 A1.

[0011] An electromagnetically actuated brake arrangement is known from DE 10 2018 006 725 A1.

[0012] The invention is therefore based on the objective of further developing a drive with an electric motor, whereby increased safety is to be achieved.

[0013] According to the invention, the problem is solved in the drive according to the features specified in claim 1.

[0014] A key advantage is that the cable routing can be implemented safely, particularly in an explosion-proof manner, while the electric motor itself remains simple and cost-effective to manufacture. The socket is especially well-suited for receiving the potting compound. During the manufacturing process, the supply lines are routed through the inside of the socket and then potted with the compound. The cable routing is quick and easy to create by simply attaching the screw-on part to the socket and then screwing it into the internal thread of the housing. Only a nut needs to be screwed onto the end of the socket to secure it to the screw-on part.

[0015] The bushing and the screw part can easily be manufactured as turned parts.

[0016] In an advantageous embodiment, the collar region of the screw part projects radially, the radial direction being relative to the screw axis of the screw part and / or the internal thread region and / or the external thread, which abuts the housing part, in particular the housing part at the edge of the stepped bore. It is advantageous that the collar region of the screw part serves as a stop for the screw part against the housing part and as a stop for the nut against the screw part.

[0017] According to the invention A seal, in particular an O-ring, is arranged between the screw part and the housing part. This seal is deformed by the collar area of ​​the screw part in such a way that it bears against both the collar area and the area of ​​the screw part adjacent to the collar area. An advantage of this design is that even the micro-gaps between the housing part and the screw part are sealed.

[0018] In a preferred embodiment, the bushing is cup-shaped and / or beaker-shaped. An advantage of this design is that the potting compound is easy to apply.

[0019] In an advantageous embodiment, the bushing has a bottom area through which the supply lines are passed, wherein the bushing has a hollow cylindrical wall area which is covered on one side and / or at its first axial end area by means of the bottom area, wherein the wall area and the bottom area are formed in one piece, in particular in one part.

[0020] In particular, the hollow cylindrical wall area defines the cavity area. An advantage of this is the ease of manufacturing.

[0021] In an advantageous embodiment, the drive is a geared motor, wherein the electric motor drives a gearbox of the geared motor. In particular, the electric motor is powered by an inverter of the drive, and in particular, the inverter is integrated with the electric motor, and in particular, at least one housing part, especially the cover part, of the electric motor performs a housing-forming function for the inverter. An advantage of this is that the drive can be designed with a high level of safety, in particular with explosion protection.

[0022] In an advantageous embodiment, a further seal, in particular an O-ring, is arranged between the bushing and the screw part. This seal is elastically deformed by the nut in such a way that it is pressed against the screw part and the bushing. The advantage of this design is that even the micro-gaps between the bushing and the screw part can be sealed, thus achieving a high level of reliability.

[0023] In a preferred embodiment, the screw component is designed as a body of revolution into which the external thread is cut. This design offers the advantage of simple manufacturing.

[0024] In an advantageous embodiment, the bushing is designed as a body of revolution in which the external thread is cut and recesses for the passage of the supply lines are formed, in particular wherein the recesses are continuous through one or the bottom area of ​​the bushing.

[0025] In particular, the ratio of the clear inner diameter of the respective recess to the outer diameter of the respective supply line passing through it has a value that is less than 1.2 and greater than 1.01. An advantage of this is that simple manufacturing is possible.

[0026] In an advantageous embodiment, a bearing seat is provided in the housing part, in which a bearing for the rotatable mounting of the rotor shaft of the electric motor is received. wherein the housing part is connected to a stator housing of the electric motor of the drive, and the stator winding of the electric motor is housed in the stator housing. An advantage of this design is its ease of manufacture.

[0027] In an advantageous embodiment, the coil is designed as a ring winding whose ring axis is aligned coaxially with the axis of rotation of the rotor shaft. This design offers the advantage of simple manufacturing.

[0028] In an advantageous embodiment, a ring-shaped driver is mounted on the rotor shaft, which has an external toothing with which an internal toothing of a brake pad carrier engages. such that the brake pad carrier is arranged to be displaceable relative to the rotor shaft parallel to the axis of rotation of the rotor shaft and is connected to the driver in a rotationally fixed manner, wherein the driver is connected to the rotor shaft in a rotationally fixed manner, wherein a ferromagnetic armature disk is arranged in the direction of the axis of rotation of the rotor shaft between the brake pad carrier and the magnet body, wherein the armature disk is connected to the magnet body in a rotationally fixed manner and is arranged to be displaceable in the direction of the axis of rotation of the rotor shaft, in particular by means of bolts being inserted into boreholes in the magnet body and protruding through recesses in the armature disk, wherein a part having a braking surface, in particular a friction plate or the housing part, is connected to the magnet body in a rotationally fixed manner and is arranged on the side of the brake pad carrier facing away from the armature disk, wherein spring elements supported on the magnet body press against the armature disk.The advantage here is that safety is increased, since in the event of a power failure the brake engages automatically, i.e., according to the laws of physics.

[0029] In an advantageous embodiment, when the coil is energized, the armature disk is pulled towards the magnet body against the spring force generated by the spring elements. When the coil is not energized, the spring elements, which are supported on the magnet body, press the armature disk onto the brake pad carrier, so that the side of the brake pad carrier facing away from the armature disk is pressed onto the braking surface. An advantage of this is that the brake engages in the event of a power failure, thus increasing safety.

[0030] In an advantageous embodiment, the collar area of ​​the screw part acts as an axial stop for the screw part against the housing part. This design offers the advantage of simple manufacturing.

[0031] In an advantageous embodiment, the largest outer diameter of the collar region of the bushing corresponds to, in particular, the largest outer diameter of the screw part in the axial region between the collar region of the bushing and the external thread of the screw part.

[0032] In particular, the screw part should be flush with and / or abut the collar area of ​​the bushing. It is advantageous that the bushing and screw part have the same inner diameter of the stepped bore. The threaded area is separated from this area by a step.

[0033] In an advantageous embodiment, the cable routing is arranged on the side of the bearing seat facing away from the stator housing of the electric motor, in the direction of the axis of rotation of the rotor shaft. In particular, a further terminal box is formed on the stator housing, into which the ends of the winding wires of the stator winding are guided, especially such that the brake and the stator windings have different terminal boxes. An advantage of this is that it allows for simple manufacturing.

[0034] Further advantages arise from the dependent claims. The invention is defined in the attached set of claims.

[0035] The invention will now be explained in more detail with reference to schematic illustrations: In the Figure 1 Figure 1 shows an enlarged section of a cross-section through an area of ​​an explosion-proof cable penetration through a housing part 1 in a drive with brake according to the invention. Figure 2 The cross-section is fully shown. In the Figure 3 An oblique view of housing part 1 is shown. In the Figure 4The cable entry point is shown partially. Figure 5 The cable entry is shown in an oblique view.

[0036] As shown in the figures, the housing part 1 has a space 20 in which a magnetic body of the brake can be received.

[0037] Housing part 1 includes a bearing seat in which a bearing for the rotatable mounting of the electric motor's rotor shaft is received. Housing part 1 is connected to the stator housing of the drive's electric motor.

[0038] A coil is embedded in the magnet body, and its magnetic field is deflected by the magnet body.

[0039] A ring-shaped drive element is mounted on the rotor shaft and fixed in place. An external toothing of the drive element engages with an internal toothing of a brake pad carrier. Thus, the brake pad carrier is fixed to the rotor shaft and slidably mounted relative to it.

[0040] A finely machined surface is provided on the bearing flange as a braking surface.

[0041] A ferromagnetic armature disc, typically made of steel, is rotationally fixed to the magnet body and is displaceable relative to it. When the coil is energized, the armature disc is pulled towards the magnet body against the spring force generated by spring elements supported on the magnet body. When the coil is not energized, the spring elements push the armature disc away from the magnet body towards the brake pad carrier, which is thus pressed against the braking surface formed on the bearing flange.

[0042] The winding wire is guided through a cable gland, which is received in a recess of the housing part 1, into a terminal box base formed on the housing part 1.

[0043] The coil can therefore be supplied from the junction box. The brake is explosion-proof. The cable gland thus ensures a sealed and explosion-proof design.

[0044] For this purpose, a continuous threaded bore is provided in the housing part 1, into which a screw part 3 with its external thread is screwed.

[0045] A seal 2 is arranged between the screw part 3 and the housing part 1. Thus, the threaded area is sealed against the external environment.

[0046] The screw part 3 has a radially projecting collar area that rests against the edge of the threaded bore. This defines the axial position of the screw part 3 relative to the housing part 1. The screw part 3 is preferably designed as a body of revolution into which the external thread is machined.

[0047] The threaded area protrudes radially from the axially adjacent areas of the screw part 3.

[0048] The axial direction is parallel to the direction of the threaded screw axis.

[0049] The screw part 3 is mounted on a cup-shaped bushing 5, the bottom of which also projects radially as a collar area, so that this radially projecting collar area of ​​the bushing 5 acts as an axial stop for the screw part 3.

[0050] At the end region of the bushing 5 facing away from the bottom of the bushing 5, an external thread is cut into the bushing 5, onto which a nut 7, in particular a hexagonal nut and / or screw nut, is screwed with its internal thread and presses on the collar region of the screw part 3, so that the screw part 3 is pressed against the collar region of the bushing 5.

[0051] The supply lines 6, in particular cables, for the coil are routed through respective recesses in the base of the socket 5 and its interior area.

[0052] In the interior area, potting compound 4 is arranged so that the supply lines 6 are surrounded by potting compound, which at least partially fills the interior area of ​​the socket 5.

[0053] In particular, the bushing 5 has a hollow cylindrical section which is closed at its first axial end by means of the plate-shaped base and its radially outwardly projecting portion. The interior of the hollow cylindrical section is filled with the potting compound 4.

[0054] At the axial end region facing away from the ground, the bushing 5 has a recess on its radial inner side, i.e. a radially outward directed indentation.

[0055] The potting compound 4 fills this indentation or depression.

[0056] This results in the potting compound 4 being positively connected to the bushing 5 after hardening.

[0057] The supply lines are radially routed through the housing part 1 in an explosion-proof manner by means of the potting compound 4 in the cable gland.

[0058] A further seal 8 is arranged between the nut 7 and the screw part 3 and touches the bushing 5, in particular at least after the nut 7 has been screwed on, which not only presses on the collar area of ​​the screw part 3, but also on the further seal 8.

[0059] In the area of ​​the recess of bushing 5, in particular in the area covered by the recess in the axial direction, the wall thickness of bushing 5 is reduced.

[0060] In further embodiments of the invention, the bearing is not housed in the housing part 1, but rather the housing part 1 is connected to a bearing flange of the electric motor of the drive, which is connected to the stator housing. A bearing for rotatably supporting the rotor shaft of the electric motor is housed in the bearing flange. Reference symbol list

[0061] 1 Housing part 2 Seal 3 Screw part 4 Potting compound 5 Bushing 6 Supply line 7 Nut 8 Further seal 9 Collar area of ​​the bushing 10 Collar area of ​​the screw part 20 Space for receiving the brake magnet body

Claims

1. A drive with an electric motor, wherein the electric motor has a housing part (1) on which is formed a lower terminal-box part on / to which a cover part can be mounted and / or connected to form a terminal box of the brake and / or of the electric motor, wherein in the housing part there is accommodated a magnet body in which a coil is accommodated, in particular in which a depression for accommodating a coil is provided, wherein the electrical supply lines (6) of the coil are routed by means of a cable gland through a stepped bore which passes through the housing part and has an internal-thread region, wherein the cable gland has a bush (5) on which an in particular hollow screwing part (3) is mounted, which is screwed into the internal-thread region by its external thread, wherein the screwing part lies against a collar region (9) of the bush protruding, in particular radially relative to the screwing axis of the screwing part, from the bush, in particular which in the axial direction acts as a stop for the screwing part, wherein a nut (7), in particular screw nut and / or hexagon nut, is screwed by its internal thread onto an external thread of the bush, so that the nut lies against a collar region (10) of the screwing part and is pressed against the collar region (10) of the screwing part, wherein the collar region (10) of the screwing part, on its side which faces away from the nut, lies against the housing part, in particular lies against the housing part on the edge of the stepped bore, wherein the bush, in particular a cylindrical cavity region of the bush, is at least partially filled with potting compound (4), wherein the supply lines are routed through from the coil into the terminal box through cutouts which pass through the bush and through the potting compound, wherein an electromagnetically actuated brake is arranged in the electric motor, wherein between the screwing part and housing part there is arranged a seal (2), in particular O-ring, which has been or is deformed by the collar region (10) of the screwing part in such a way that the seal lies both against the collar region (10) of the screwing part and against that region of the screwing part which adjoins the collar region (10) of the screwing part.

2. A drive according to claim 1, characterised in that the collar region (10) of the screwing part protrudes radially, with the radial direction being related to the screwing axis of the screwing part and / or of the internal-thread region and / or of the external thread, which collar region lies against the housing part, in particular against the housing part on the edge of the stepped bore.

3. A drive according to one of the preceding claims, characterised in that the bush is embodied in a pot shape and / or in a cup shape, and / or in that the bush has a base region through which the supply lines are routed, with the bush having a hollow-cylindrical wall region which is covered on one side and / or on its first axial end region by means of the base region, with the wall region and the base region being formed in one piece, in particular in one part, in particular with the hollow-cylindrical wall region delimiting the cavity region.

4. A drive according to one of the preceding claims, characterised in that the drive is a geared motor, with the electric motor driving a gear unit of the geared motor, in particular with the electric motor being fed by an inverter of the drive, in particular with the inverter being formed integrated together with the electric motor, in particular therefore at least one housing part, in particular the cover part, of the electric motor performing a housing-forming function for the inverter.

5. A drive according to one of the preceding claims, characterised in that between the bush and screwing part there is arranged a further seal, in particular O-ring, which is or becomes elastically deformed by the nut in such a way that the further seal is or becomes pressed against the screwing part and against the bush.

6. A drive according to one of the preceding claims, characterised in that the screwing part is embodied as a rotary body into which the external thread is cut.

7. A drive according to one of the preceding claims, characterised in that the bush is embodied as a rotary body into which the external thread is cut and cutouts for routeing the supply lines through are formed, in particular with the cutouts being formed continuously through a or the base region of the bush, in particular with the quotient of the clear internal diameter of the respective cutout and the external diameter of the respective supply line routed through [through] having between a value which is smaller than 1.2 and is greater than 1.01.

8. A drive according to one of the preceding claims, characterised in that in the housing part there is provided a bearing seat in which a bearing for rotatably mounting the rotor shaft of the electric motor is accommodated, with the housing part being connected to a stator housing of the electric motor of the drive, with the stator winding of the electric motor being accommodated in the stator housing.

9. A drive according to one of the preceding claims, characterised in that the coil is embodied as a ring winding, the ring axis of which is oriented coaxially with the axis of rotation of the rotor shaft.

10. A drive according to one of the preceding claims, characterised in that on the rotor shaft there is mounted a ring-like driving element which has external gearing with which internal gearing of a brake lining carrier meshes, so that the brake lining carrier is arranged displaceably parallel to the axis of rotation of the rotor shaft in relation to the rotor shaft and is connected non-rotatably to the driving element, with the driving element being connected non-rotatably to the rotor shaft, with a ferromagnetic armature disc being arranged in the direction of the axis of rotation of the rotor shaft between the brake lining carrier and the magnet body, with the armature disc being connected non-rotatably to the magnet body and being arranged displaceably in the direction of the axis of rotation of the rotor shaft, in particular in that bolts are inserted into drilled holes in the magnet body and protrude through cutouts in the armature disc, with a part having a braking surface, in particular friction plate or the housing part, being connected non-rotatably to the magnet body and being arranged on that side of the brake lining carrier which faces away from the armature disc, with spring elements which are supported on the magnet body pressing on the armature disc.

11. A drive according to one of the preceding claims, characterised in that when the coil is energised the armature disc is drawn towards the magnet body counter to the spring force generated by the spring elements, with, when the coil is not energised, the armature disc being pressed onto the brake lining carrier by the spring elements which are supported on the magnet body, so that the brake lining carrier is pressed onto the braking surface with its side which faces away from the armature disc.

12. A drive according to one of the preceding claims, characterised in that the collar region (10) of the screwing part acts as an axial stop for the screwing part on the housing part.

13. A drive according to one of the preceding claims, characterised in that the greatest external diameter of the collar region (9) of the bush is the same as the in particular greatest external diameter of the screwing part in the axial region between the collar region (9) of the bush and the external thread of the screwing part, in particular so that the screwing part abuts and / or adjoins the collar region (9) of the bush in a flush manner.

14. A drive according to one of the preceding claims, characterised in that in the direction of the axis of rotation of the rotor shaft the cable gland is arranged on that side of the bearing seat which faces away from the stator housing of the electric motor, in particular with there being formed on the stator housing a further terminal box, into which the ends of the winding wires of the stator winding are guided, in particular such that the brake and the stator windings have different terminal boxes.