Electric fan motor comprising brakes

Abstract

The invention relates to an electric motor which comprises: a rotatably mounted rotor shaft; a first electromagnetically actuatable brake (21, 27); a second electromagnetically actuatable brake (23, 34); a bearing shield (20); a cover flange (1); and a fan cowl (2) surrounding a fan (26). The friction torque of each of the brakes can be transmitted into the rotor shaft. The first brake (21, 27) is surrounded by the cover flange (1) which is fastened to the bearing shield (20) of the electric motor. The second brake (23, 34) is at least radially surrounded by the fan cowl (2) which is fastened to the cover flange (1). The magnetic body (27) of the first brake (21, 27) is connected via first connecting means, such as bolts, to the bearing shield (20) for conjoint rotation therewith. The magnetic body (24) of the second brake (23, 24) is connected via second connecting means, such as second bolts, to the cover flange (1) for conjoint rotation therewith.

Description

[0001] ELECTRIC FAN MOTOR WITH BRAKES

[0002] Description:

[0003] The invention relates to an electric motor.

[0004] It is well known that safe operation can be achieved with a redundant design of an active component, such as a brake of an electric motor.

[0005] The invention is therefore based on the object of developing an electric motor, whereby increased safety can be achieved.

[0006] According to the invention, the object is achieved in the electric motor according to the features specified in claim 1.

[0007] Important features of the invention in the electric motor are that the electric motor has a rotatably mounted rotor shaft, a first electromagnetically actuated brake and a second electromagnetically actuated brake, in particular wherein the two brakes are arranged in the electric motor such that the friction torque that can be generated by the respective brake is or is introduced into the rotor shaft of the electric motor, wherein the first brake is surrounded at least radially by a hood flange that is fastened to a bearing plate of the electric motor, wherein the second brake is surrounded at least radially by a fan hood that is fastened to the hood flange, wherein a magnetic body of the first brake is connected in a rotationally fixed manner to the bearing plate via first connecting means, in particular bolts, wherein a magnetic body of the second brake is connected in a rotationally fixed manner to the hood flange via second connecting means, in particular second bolts.The advantage here is that the first brake is mounted directly on the bearing plate, while the second brake is mounted via the rigid and stable cover flange. Although the second brake is further away from the bearing plate, this allows for a rigid and stable coupling of the second brake. This ensures stable, uninterrupted, safe operation.

[0008] In an advantageous embodiment, the first brake is designed and / or constructed identically to the second brake. The advantage here is that reliable, safe operation can be achieved at low cost.

[0009] In an advantageous embodiment, a bearing for rotatably supporting the electric motor's rotor shaft is incorporated in the bearing plate. The advantage here is that the bearing plate enables stable support of the rotor shaft.

[0010] In an advantageous embodiment, the bearing shield is connected to a stator housing, which is connected to a bearing flange on its side facing away from the bearing shield. This flange accommodates another bearing for the rotatable mounting of the electric motor's rotor shaft. This provides the advantage of enabling a stable mounting.

[0011] In an advantageous embodiment, the fan cover also encloses a fan impeller that is non-rotatably connected to the rotor shaft, along with the second brake. This is advantageous because it enables efficient operation.

[0012] In an advantageous embodiment, the rotating part, in particular the hollow shaft, of an angle sensor is connected in a rotationally fixed manner to the rotor shaft, in particular to the end region of the rotor shaft axially remote from the stator housing. The angle sensor is surrounded at least radially by a cover connected to the fan cover. This advantageously allows for monitoring the rotational movement of the rotor shaft, thus enabling safe operation.

[0013] In an advantageous embodiment, the cover flange is aligned with the bearing plate by means of centering means, in particular, the cover flange has a centering collar that is pushed onto a centering edge formed on the bearing plate, in particular on the radial outer circumference of the bearing plate. This advantageously enables alignment and centering of the second brake with high precision.

[0014] In an advantageous embodiment, the centering means are spaced apart from one another in the circumferential direction, and each of the centering means has at least three adjacent, planar, in particular flat, ground, in particular layered and / or fine-grinding, surface regions formed on the radial outer circumference of the bearing plate, which adjoin one another, which bear against corresponding three adjacent, planar, in particular flat, ground, in particular layered and / or fine-grinding, inner surface regions of the cover flange. The advantage here is that two or more such surface tuples enable highly precise alignment when placing the cover flange onto the bearing plate in a simple manner.

[0015] In an advantageous embodiment, the hood flange has an annular region connected to an annular base region of the hood flange via first and second webs extending radially and axially. The advantage here is that the annular region is held in a stable manner.

[0016] In an advantageous design, the distance between the bearing plate and the respective web decreases, particularly monotonically, with increasing radial distance. This is advantageous because it allows for high load capacity.

[0017] In an advantageous embodiment, the first and second webs are spaced apart from one another in the circumferential direction, the second webs extending axially further than the first webs, both the first webs and the second webs opening radially outwards into the inner wall of the cover flange. It is advantageous in this case that the annular region is kept rigid. In an advantageous embodiment, the in particular smallest wall thickness, in particular the in particular smallest radial wall thickness, of the cover flange is greater than the in particular largest wall thickness, in particular largest radial wall thickness, of the fan cover. It is advantageous in this case that the cover flange is stable and thus rigid and therefore the second brake is precisely aligned.

[0018] In an advantageous embodiment, the second brake is axially spaced from the first brake. This allows for redundant braking operation.

[0019] In an advantageous embodiment, the cover flange is a machined metal casting, while the fan cover is a sheet metal part or a plastic injection-molded part. This is advantageous because the necessary mechanical forces can be absorbed.

[0020] In an advantageous embodiment, a first annular externally toothed driver is fitted onto the rotor shaft and is connected to the rotor shaft in a rotationally fixed manner, in particular by means of a key connection, wherein a first annular disk-shaped brake pad carrier is fitted onto the first driver and engages with its internal toothing with the external toothing of the first driver, so that the first brake pad carrier is axially movable and is connected to the first driver in a rotationally fixed manner, wherein a first ferromagnetic armature disk is arranged axially between the first magnetic body and the first brake pad carrier, wherein an annular recess is formed in the first magnetic body, into which an electrically energizable first coil is inserted and whose annular axis is aligned coaxially with the axis of rotation of the first rotor shaft, wherein the armature disk is connected to the magnetic body in a rotationally fixed manner and is axially movable,in particular in that bolts pressed into bores of the magnetic body protrude through recesses in the armature disk, wherein first spring elements supported on the first magnetic body press on the first armature disk, in particular wherein when the first coil is not energized, the first armature disk is pressed by the first spring elements onto the first brake pad carrier, which is thus pressed onto a braking surface formed on the bearing plate, and wherein when the first coil is energized, the armature disk is pulled towards the first magnetic body against the spring force generated by the first spring elements.

[0021] In an advantageous embodiment, a second annular externally toothed driver is fitted onto the rotor shaft and is connected to the rotor shaft in a rotationally fixed manner, in particular by means of a key connection, wherein a second annular disk-shaped brake pad carrier is fitted onto the second driver and engages with its internal toothing with the external toothing of the second driver, so that the second brake pad carrier is axially movable and is connected to the second driver in a rotationally fixed manner, wherein a second ferromagnetic armature disk is arranged axially between the second magnetic body and the second brake pad carrier, wherein an annular recess is formed in the second magnetic body, into which an electrically energizable second coil is inserted and whose annular axis is aligned coaxially with the axis of rotation of the second rotor shaft, wherein the armature disk is connected to the magnetic body in a rotationally fixed manner and is axially movable,In particular, bolts pressed into bores in the magnetic body protrude through recesses in the armature disk, with second spring elements supported on the second magnetic body pressing on the second armature disk. In particular, when the second coil is not energized, the second armature disk is pressed by the second spring elements onto the second brake pad carrier, which is thus pressed onto a braking surface formed on the annular region of the hood flange. When the second coil is energized, the armature disk is pulled toward the second magnetic body against the spring force generated by the second spring elements. The advantage here is that in the event of a power failure, the brakes are automatically activated, thus enabling safe operation.

[0022] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0023] The invention will now be explained in more detail using schematic illustrations:

[0024] Figure 1 shows an electric motor according to the invention in an oblique view.

[0025] Figure 2 shows a section of the electric motor.

[0026] Figure 3 shows the hood flange 1 in an oblique view.

[0027] As shown in the figures, the electric motor has a stator housing 4, which is connected at its first axial end to a bearing plate 20 and at its other axial end to a bearing flange. The bearing plate 20 accommodates a first bearing for rotatably supporting the rotor shaft of the electric motor; the bearing flange accommodates a second bearing for rotatably supporting the rotor shaft of the electric motor.

[0028] On the end shield 20, on the side of the end shield axially remote from the stator housing, a first electromagnetically actuated brake is arranged, which is surrounded by a hood flange 1, on which a second electromagnetically actuated brake is arranged on its side axially remote from the stator housing.

[0029] The second electromagnetically actuated brake is enclosed by a fan cover, which also surrounds a fan wheel 26 that is non-rotatably connected to the rotor shaft. The fan cover is attached to cover flange 1.

[0030] At the end region of the rotor shaft axially remote from the stator housing, an angle sensor 25 is arranged to determine the angular position of the rotor shaft, wherein the angle sensor is surrounded by a further cover which is fastened to the fan cover.

[0031] The wall thickness of the cover flange 1 is greater than the wall thickness of the fan cover and the cover.

[0032] The fan wheel is mounted on the rotor shaft and connected to the rotor shaft in a rotationally fixed manner, which extends through both the first brake and the second brake, particularly in the axial direction. The space enclosed by the fan cover 2 includes not only the fan wheel but also at least part of the surface of the second brake.

[0033] The area covered by the fan cover 2 in the axial direction includes the area covered by the second brake in the axial direction and the area covered by the fan wheel 24 in the axial direction.

[0034] The air flow sucked in by the fan wheel 26 flows through a hood grille of the hood and a fan hood grille of the fan hood 2 and is then conveyed by the fan wheel 26 to the hood flange 1 and then along the stator housing of the electric motor.

[0035] The first and second brakes are identical in design.

[0036] The first brake comprises a magnetic body 27 with an annular recess into which an electrically energizable coil is inserted. The annular axis of the recess is aligned coaxially with the rotational axis of the rotor shaft.

[0037] A driver with external gearing is mounted on the rotor shaft. The driver is connected to the rotor shaft in a rotationally fixed manner, particularly by means of a keyway.

[0038] A ring-shaped brake pad carrier is mounted on the carrier, with the inner teeth of the brake pad carrier engaging the outer teeth of the carrier. Thus, the brake pad carrier is non-rotatably connected to the rotor shaft and arranged for axial movement.

[0039] An armature disk is arranged axially between the magnetic body and the brake pad carrier and is connected to the magnetic body in a rotationally fixed manner and is arranged to be axially movable, in particular by bolts attached to the magnetic body projecting through the armature disk in the axial direction.

[0040] Spring elements supported on the magnet body press against the armature disk, so that when the coil is energized, the armature disk is pulled toward the magnet body against the spring force generated by the spring elements. When the coil is deenergized, however, the spring elements press the armature disk onto the brake pad carrier, which is thus pressed onto a braking surface formed on the bearing plate 20. In the event of a power failure, the first brake is automatically applied.

[0041] Preferably, the bolts connect the magnet body to the bearing plate 20.

[0042] The second brake has a second magnetic body 24, which has a second annular recess into which a second electrically energizable coil is inserted. The annular axis of the second recess is aligned coaxially with the rotational axis of the rotor shaft.

[0043] A second driver 22 is mounted on the rotor shaft, which has a second external toothing and is ring-shaped. The second driver 22 is connected to the rotor shaft in a rotationally fixed manner, in particular by means of a second key connection.

[0044] A second annular disc-shaped brake pad carrier is mounted on the second driver 22, with the second internal toothing of the second brake pad carrier engaging the external toothing of the second driver. Thus, the second brake pad carrier is non-rotatably connected to the rotor shaft and arranged for axial movement.

[0045] A second armature disk 23 is arranged axially between the second magnetic body 24 and the second brake pad carrier and is connected to the second magnetic body 24 in a rotationally fixed manner and is arranged to be axially movable, in particular in that second bolts fastened to the second magnetic body 24 protrude through the second armature disk 23 in the axial direction.

[0046] Second spring elements supported on the second magnetic body press on the second armature disk 23, so that when the coil is energized, the second armature disk 23 is pulled toward the second magnetic body 24 against the spring force generated by the second spring elements. When the second coil is not energized, however, the second spring elements press the second armature disk 23 onto the second brake pad carrier, which is thus pressed onto a second braking surface formed on the cover flange 1. In the event of a power failure, the second brake is automatically applied.

[0047] Preferably, the bolts connect the second magnetic body 24 to the hood flange 1. The frictional heat of the second brake is thus essentially dissipated to the environment via the hood flange 1.

[0048] As shown in Figure 3, the hood flange 1 has an annular region 32 on which the second braking surface of the second brake is formed. For this purpose, the annular region 32 is machined by grinding, in particular, finely ground.

[0049] The annular region 32 is held by first webs 31 and second webs 33, which extend radially outwards in a radiating manner, wherein with increasing radial distance the distance between the bearing plate and the respective web (31, 33) decreases, in particular monotonically.

[0050] The webs (31, 33) are spaced apart from each other in the circumferential direction.

[0051] The second webs 33 extend axially further than the first webs 31.

[0052] Both the first webs 31 and the second webs 33 open radially outwards into the inner wall of the hood flange 1, i.e. an annular base area of ​​the hood flange 1.

[0053] In addition, the hood flange 1 has radially continuous openings 30 on its outer circumference, which are spaced apart from each other in the circumferential direction. Thus, a manual release lever can be guided out through one of the openings, depending on the mounting direction.

[0054] The manual release lever is rotatably mounted on the magnetic body of the first brake so that it can be pivoted between a first and a second angle. Depending on its angle of rotation, in particular pivot angle, a rod attached to the manual release lever and protruding through a continuous recess in the magnetic body is axially movable. The rod also protrudes through the armature disk and has a limiting means, in particular a thickened portion or a corresponding securing means, at its end facing away from the magnetic body, so that the armature disk is axially limited by the limiting means and by correspondingly moving the rod, the armature disk is moved such that the brake is released. The annular region 32 forms the front region of the hood flange, in particular the cover of the hood.

[0055] Adjacent to the ring area 32, threaded holes are provided in the hood flange 1 so that the bolts attached to the magnet body can be connected to the hood flange 1.

[0056] The radial direction and the circumferential direction are relative to the rotational axis of the rotor shaft. The axial direction is parallel to the rotational axis of the rotor shaft. In further embodiments of the invention, the rotor shaft is constructed in two or more pieces instead of the aforementioned single-piece design.

[0057] List of reference symbols

[0058] 1 hood flange

[0059] 2 junction boxes

[0060] 3 junction box

[0061] 4 Stator housing

[0062] 20 bearing plate

[0063] 21 brake pad carrier

[0064] 22 drivers

[0065] 23 Anchor disc

[0066] 24 magnetic bodies

[0067] 25 angle sensor

[0068] 26 Fan wheel

[0069] 27 magnetic bodies

[0070] 30 Opening for manual release lever, depending on mounting direction

[0071] 31 first bridge

[0072] 32 ring area

[0073] 33 second bridge

Claims

Patent claims:

1. An electric motor, wherein the electric motor has a rotatably mounted rotor shaft, a first electromagnetically actuated brake, and a second electromagnetically actuated brake, in particular wherein the two brakes are arranged in the electric motor such that the frictional torque that can be generated by the respective brake is or is introduced into the rotor shaft of the electric motor, characterized in that the first brake is at least radially surrounded by a cover flange that is fastened to a bearing plate of the electric motor, wherein the second brake is at least radially surrounded by a fan cover that is fastened to the cover flange, wherein a magnetic body of the first brake is connected in a rotationally fixed manner to the bearing plate via first connecting means, in particular bolts, wherein a magnetic body of the second brake is connected in a rotationally fixed manner to the cover flange via second connecting means, in particular second bolts,in particular, wherein the first electromagnetically actuated brake is spaced from the second electromagnetically actuated brake in the axial direction, in particular in a direction parallel to the axis of rotation of the rotor shaft., 2. Electric motor according to claim 1, characterized in that the first brake is identical to the second brake and / or has the same construction.

3. Electric motor according to one of the preceding claims, characterized in that a bearing for rotatably supporting the rotor shaft of the electric motor is accommodated in the bearing plate.

4. Electric motor according to one of the preceding claims, characterized in that the bearing plate is connected to a stator housing which, on its side facing away from the bearing plate, is connected to a bearing flange which accommodates a further bearing for the rotatable mounting of the rotor shaft of the electric motor.

5. Electric motor according to one of the preceding claims, characterized in that, together with the second brake, a fan wheel connected in a rotationally fixed manner to the rotor shaft is also surrounded by the fan cover.

6. Electric motor according to one of the preceding claims, characterized in that the rotatable part, in particular hollow shaft, of an angle sensor is connected in a rotationally fixed manner to the rotor shaft, in particular to the end region of the rotor shaft axially remote from the stator housing, wherein the angle sensor is surrounded at least radially by a hood which is connected to the fan hood.

7. Electric motor according to one of the preceding claims, characterized in that the hood flange is aligned with the bearing plate by means of centering means, in particular wherein the hood flange has a centering collar which is pushed onto a centering edge formed on the bearing plate, in particular on the radial outer circumference of the bearing plate.

8. Electric motor according to one of the preceding claims, characterized in that the centering means are spaced apart from one another in the circumferential direction and each of the centering means has at least three mutually adjacent, planar, in particular flat, ground, in particular machined with layers and / or fine grinding, surface areas formed on the radial outer circumference of the bearing plate, which surface areas bear against corresponding three mutually adjacent, planar, in particular flat, ground, in particular machined with layers and / or fine grinding, inner surface areas of the hood flange.

9. Electric motor according to one of the preceding claims, characterized in that the hood flange has an annular region which is connected to an annular base region of the hood flange via first and second webs which extend radially and axially.

10. Electric motor according to one of the preceding claims, characterized in that with increasing radial distance the distance between the bearing plate and the respective web decreases, in particular monotonically.

11. Electric motor according to one of the preceding claims, characterized in that the first and second webs are spaced apart from one another in the circumferential direction, the second webs extending axially further than the first webs, both the first webs and the second webs opening radially outwards into the inner wall of the hood flange.

12. Electric motor according to one of the preceding claims, characterized in that the in particular smallest wall thickness, in particular the in particular smallest radial wall thickness, of the hood flange is greater than the in particular largest wall thickness, in particular largest radial wall thickness, of the fan hood.

13. Electric motor according to one of the preceding claims, characterized in that the second brake is axially spaced from the first brake.

14. Electric motor according to one of the preceding claims, characterized in that the cover flange is a machined metal casting, the fan cover being a sheet metal part or a plastic injection-molded part.

15. Electric motor according to one of the preceding claims, characterized in that a first annular externally toothed driver is mounted on the rotor shaft and is connected to the rotor shaft in a rotationally fixed manner, in particular by means of a key connection, wherein a first annular disk-shaped brake pad carrier is mounted on the first driver and engages with its internal toothing with the external toothing of the first driver, so that the first brake pad carrier is axially movable and is connected to the first driver in a rotationally fixed manner, wherein a first ferromagnetic armature disk is arranged axially between the first magnetic body and the first brake pad carrier, wherein an annular recess is formed in the first magnetic body, into which an electrically energizable first coil is inserted and whose annular axis is aligned coaxially with the axis of rotation of the first rotor shaft,wherein the armature disk is connected to the magnetic body in a rotationally fixed manner and is axially movable, in particular by bolts pressed into bores in the magnetic body projecting through recesses in the armature disk, wherein first spring elements supported on the first magnetic body press on the first armature disk, in particular wherein when the first coil is not energized, the first armature disk is pressed by the first spring elements onto the first brake pad carrier, which is thus pressed onto a braking surface formed on the bearing plate, and wherein when the first coil is energized, the armature disk is pulled towards the first magnetic body against the spring force generated by the first spring elements.

16. Electric motor according to one of the preceding claims, characterized in that a second annular externally toothed driver is mounted on the rotor shaft and is connected to the rotor shaft in a rotationally fixed manner, in particular by means of a key connection, wherein a second annular disc-shaped brake pad carrier is mounted on the second driver and engages with its internal toothing with the external toothing of the second driver, so that the second brake pad carrier is axially movable and is connected to the second driver in a rotationally fixed manner, wherein a second ferromagnetic armature disc is arranged axially between the second magnetic body and the second brake pad carrier, wherein an annular recess is formed in the second magnetic body, into which an electrically energizable second coil is inserted and whose annular axis is aligned coaxially with the axis of rotation of the second rotor shaft,wherein the armature disk is connected to the magnetic body in a rotationally fixed manner and is axially movable, in particular by bolts pressed into bores in the magnetic body protruding through recesses in the armature disk, wherein second spring elements supported on the second magnetic body press on the second armature disk, in particular wherein, when the second coil is not energized, the second armature disk is pressed by the second spring elements onto the second brake pad carrier, which is thus pressed onto a braking surface formed on the annular region of the hood flange, and wherein, when the second coil is energized, the armature disk is pulled towards the second magnetic body against the spring force generated by the second spring elements.

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