Electric motor having an electromagnetically actuatable brake

Abstract

Electric motor having an electromagnetically actuatable brake, wherein the brake is a tiltably, in particular rotatably, mounted manual bleeding part, in particular for manually bleeding the brake, wherein a proximity sensor for detecting the tilted position of the manual bleeding part is mounted on a supporting ring, wherein the supporting ring fully surrounds and / or encloses a magnetic part of the brake in the circumferential direction, the circumferential direction being in particular the circumferential direction in relation to the axis of rotation of the rotor shaft.

Description

[0001] Electric motor with electromagnetically operated brake

[0002] Description:

[0003] The invention relates to an electric motor with an electromagnetically actuated brake.

[0004] It is generally known that an electric motor can be designed as a brake motor, in particular that it can be equipped with an integrated brake.

[0005] The invention is therefore based on the object of developing a series of electric motors with a high degree of variance using a small number of parts.

[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 with electromagnetically actuated brake are that the brake has a tiltable, in particular rotatable, manual release part, in particular for manually releasing the brake, wherein a proximity sensor for detecting the tilt position of the manual release part is fastened to a retaining ring, wherein the retaining ring completely surrounds and / or encompasses a magnetic body of the brake in the circumferential direction, in particular wherein the circumferential direction is related to the axis of rotation of the rotor shaft.

[0008] The advantage here is that the retaining ring is uninterrupted and thus completely surrounds the magnet body circumferentially. This allows for various mounting positions for the proximity sensor on the circumference of the electric motor. Therefore, a high degree of variation within a series of electric motors can be manufactured without additional parts. The variants of the series, i.e., the electric motors within the series, differ in that the proximity sensor is arranged at different circumferential positions. This is because the retaining ring already has a hole for each of the mounting positions.

[0009] The retaining ring is held by retaining bolts that are arranged at a greater radial distance than the largest radial distance of the magnet body. Thus, not only the retaining ring but also the retaining bolts are arranged radially outside the magnet body. This allows the proximity sensor to be arranged radially outside the magnet body, thus detecting the status of the manually operated brake release. Increased safety can be achieved by simultaneously energizing the coil and additionally actuating the manual brake release.

[0010] In an advantageous embodiment, the ring axis of the retaining ring is aligned coaxially with the rotational axis of the rotor shaft of the electric motor. This advantageously means that the retaining ring is spaced substantially evenly from the magnetic body, thus keeping the magnetic field conducted in the ferromagnetic magnetic body away from the retaining ring and thus also away from the proximity sensor.

[0011] In an advantageous embodiment, the retaining ring is radially spaced from the magnetic body. This has the advantage that the magnetic field conducted in the magnetic body is kept away from the retaining ring and thus also from the proximity sensor.

[0012] In an advantageous embodiment, the retaining ring has axially through holes for optionally mounting the proximity sensor, with the proximity sensor protruding through a first of the holes. This is advantageous because the proximity sensor can be mounted at different circumferential positions.

[0013] In an advantageous embodiment, the retaining ring is held by retaining bolts that are attached to a bearing plate of the electric motor, with the bearing plate being axially spaced from the retaining ring. Advantageously, the bearing plate accommodates a bearing of the rotor shaft, and the brake with its brake plate is also mounted on the bearing plate.

[0014] In an advantageous embodiment, a sensor plate for detection by the proximity sensor is attached to the manual release part, in particular wherein the sensor plate is bent in a U-shape and the proximity sensor is spaced closer to one leg of the U-shaped sensor plate than to the second leg of the U-shaped sensor plate. Advantageously, the tilt position, in particular the rotational position, of the manual release part can be detected and / or monitored by the proximity sensor.

[0015] In an advantageous embodiment, the manual release part has a recess into which a lever part can be inserted, particularly for easier manual operation. This is advantageous because manual operation of the manual release can be carried out with little effort.

[0016] In an advantageous embodiment, an annular externally toothed driver is placed on the rotor shaft of the electric motor and is connected to the rotor shaft in a rotationally fixed manner, in particular by means of a keyway connection, wherein an annular disk-shaped brake pad carrier is placed with its internal toothing on the driver, in particular wherein the internal toothing engages the external toothing, so that the brake pad carrier is connected to the driver in a rotationally fixed manner and is arranged to be axially movable, wherein an armature disk is arranged axially between the brake pad carrier and the magnetic body, wherein the armature disk is connected to the magnetic body in a rotationally fixed manner and is axially movable, wherein spring elements supported on the magnetic body press on the armature disk. The advantage here is that the brake applies automatically in the event of a power failure.

[0017] In an advantageous embodiment, a brake shield is connected to the magnet body via bolts that protrude through recesses in the armature disk. This is advantageous because an additional brake can be mounted on the bolts, thus achieving increased safety through brake redundancy. In an advantageous embodiment, the retaining ring is held by, in particular, three retaining bolts that are connected to the bearing shield. This is advantageous because it allows for stable holding of the retaining ring. The retaining bolts are preferably all arranged at the same radial distance.

[0018] In an advantageous embodiment, the manual release part rests on the end face of the magnet body axially remote from the bearing plate, in particular via a tilting bearing, in particular a pivot bearing, whose tilting axis, in particular a rotational axis, is aligned perpendicular to the rotational axis of the rotor shaft. The advantage here is that the tilting bearing can be implemented as a support through a simple design.

[0019] In an advantageous embodiment, the manual release part is connected to at least one rod, in particular via a further pivot joint, wherein the axial position depends on the tilt angle of the manual release part. The rod extends through the magnetic body. The rod has a limiting means on the side of the armature disk axially facing away from the magnetic body, which limits the armature disk in the axial direction. It is advantageous that the manual release part entrains the rod in the axial direction during its tilting movement, and thus the axial limit of the armature disk can be displaced accordingly in the axial direction.

[0020] In an advantageous embodiment, the rod extends through the armature disk. This is advantageous because the manual release part is held on the magnet body.

[0021] In an advantageous embodiment, the limiting means is a thickened portion of the rod or a part connected to the rod, in particular a nut screwed onto a threaded portion of the rod. The advantage here is that the axial limitation can be implemented simply and cost-effectively.

[0022] In an advantageous embodiment, the manual release part has a curved contour, with which the manual release part rests against a flat surface area of ​​the front side of the magnet body. This is advantageous because the tilting bearing can be realized with a simple shape.

[0023] In an advantageous embodiment, the lever part extends in a radial direction, which forms a non-zero angle with the first leg of the U-shaped sensor plate. This advantageously allows the proximity sensor to be arranged laterally next to the lever part in the circumferential direction, thus avoiding any restriction, in particular preventing any collision between the manual release part and the proximity sensor and / or sensor plate.

[0024] 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.

[0025] The invention will now be explained in more detail using schematic illustrations:

[0026] Figure 1 shows an oblique view of an area of ​​an electric motor according to the invention.

[0027] Figure 2 shows the area from a different angle.

[0028] Figure 3 shows a retaining ring 5 of the electric motor in an oblique view.

[0029] Figure 4 shows an oblique view of a proximity sensor 10 of the electric motor.

[0030] As shown in the figures, the electric motor has a stator housing 1 through which a rotor shaft projects, the first bearing of which is accommodated in a bearing shield 2 and the second bearing of which is accommodated in a bearing flange not shown in the figures.

[0031] The axial direction is parallel to the rotor shaft's axis of rotation. The radial direction, the radial distances, and the circumferential direction are also always relative to the rotor shaft's axis of rotation.

[0032] The bearing shield 2 and the bearing flange are axially spaced from each other and connected to the stator housing.

[0033] An electromagnetically actuated brake is integrated into the electric motor. A protective cover of the electric motor, connected to the bearing plate 2 and surrounding the brake, is hidden in the figures and therefore not shown.

[0034] The brake comprises a magnetic body made of ferromagnetic material and 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. An annular driver with external teeth is mounted on the rotor shaft. The driver is connected to the rotor shaft in a rotationally fixed manner, in particular by means of a keyway.

[0035] A ring-disk-shaped brake pad carrier is placed on the driver, whereby an internal toothing of the brake pad carrier is in engagement with the external toothing of the driver and is connected to it in a rotationally fixed manner, but is arranged to be movable in the axial direction.

[0036] An armature disk arranged axially between the brake pad carrier and the magnet body 6 is connected to the magnet body in a rotationally fixed manner and is arranged to be movable in the axial direction. For this purpose, axially aligned bolts preferably protrude through recesses in the armature disk, with the bolts being pressed into boreholes in the magnet body.

[0037] A brake plate 3 is arranged axially between the bearing plate 2 and the brake pad carrier, which has a braking surface on its side facing the magnet body 6. In particular, the braking surface is finely machined, in particular ground.

[0038] Spring elements supported on the magnet body 6 press on 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 energized, the brake is thus released.

[0039] When the brake is de-energized, however, the spring elements press the armature disc onto the brake pad carrier, which is then pressed onto the braking surface of the brake plate 3. This causes the brake to engage when the brake is de-energized, thus increasing safety.

[0040] The brake plate 3 is connected to the magnet body via bolts. This allows the brake to be pre-assembled and mounted on the brake plate 3.

[0041] Overall, the brake is attached to the bearing plate 2 by screwing the brake plate 3.

[0042] To enable manual release of the brake during maintenance work, a manual release part 7 is provided, which can be rotated through a particularly small tilt angle, in particular a rotation angle. For this purpose, a tilting bearing, in particular a pivot bearing, is preferably designed as a support. The rotation axis of the tilting bearing, in particular a pivot bearing, is aligned perpendicular to the rotation axis of the rotor shaft.

[0043] During the tilting movement of the manual release part 7, rods are driven, i.e., moved in the axial direction depending on the tilt angle. The rods extend through both the magnet body 6 and the armature disc and have a limiting element at their end facing away from the manual release part 7, which axially limits the freedom of movement of the armature disc. Thus, if the tilt angle of the manual release part 7 becomes sufficiently large, the armature disc is drawn toward the magnet body, and the brake is released, especially when the coil is not energized. This is because the manually induced tilting of the manual release part overcomes the spring force exerted by the spring elements.

[0044] A lever part can be inserted into a recess 11 of the manual release part 7, so that manual operation is simplified by extending the lever arm as a result of the lever law.

[0045] A sensor plate 8 is attached to the manual release part 7 by means of a screw. Therefore, when the manual release part 8 is tilted, the sensor plate 8 moves with the manual release part 8.

[0046] A proximity sensor 10, in particular an inductive proximity switch, is attached to a retaining ring 5. Preferably, the sensor line of the proximity sensor 10 is routed axially toward the stator housing. Alternatively, a capacitive proximity sensor can be used instead of an inductive proximity sensor, although such a sensor can also detect non-metallic objects.

[0047] The proximity sensor 10 detects the sensor plate 8 when it falls below a first distance from the proximity sensor 10. For this purpose, the sensor plate is bent in a U-shape and axially spaced from the proximity sensor. The proximity sensor 10 is spaced closer to a first leg of the U-shaped sensor plate 8 than the second leg of the U-shaped sensor plate 8 is to the first leg.

[0048] In this way, the position of the manual release part 7 and thus also the position of the manual release can be monitored by means of the proximity sensor 10. The retaining ring 5 is attached to the bearing plate 2 via retaining bolts 9, in particular three retaining bolts 9. The ring axis of the retaining ring 5 is aligned coaxially with the rotational axis of the rotor shaft.

[0049] The retaining ring 5 has through holes, in particular four through holes. Although these holes are all arranged at the same radial distance, they are located at different circumferential angular positions. The holes are thus spaced from each other in the circumferential direction, in particular evenly spaced.

[0050] The proximity sensor 10 protrudes through one of the holes and is attached to this hole.

[0051] Optionally, the proximity sensor 10 could also be mounted at one of the other holes, in which case the manual release part 7 would be mounted rotated accordingly. In this way, the manual release lever protrudes radially at the selected circumferential position.

[0052] The retaining ring 5 is designed to be continuous in the circumferential direction and thus enables four different mounting positions for the proximity sensor 10.

[0053] The retaining ring 5 is radially spaced from the magnetic body 6. In particular, the retaining ring 5 surrounds the magnetic body 6 continuously in the circumferential direction.

[0054] The retaining bolts 9 are axially directed and radially spaced from the magnet body 6.

[0055] The area covered by the retaining ring 5 in the axial direction is contained in the area covered by the magnetic body 6 in the axial direction.

[0056] The second leg of the sensor plate 8 is arranged on the side of the sensor plate 8 facing away from the proximity sensor 10.

[0057] In further embodiments according to the invention, the sensor plate 8 is designed as a single piece with the manual release part 7, in particular as a single piece.

[0058] I Stator housing 2 Bearing shield

[0059] 3 brake shield

[0060] 4 anchor plate

[0061] 5 retaining ring

[0062] 6 Magnet body 7 Manual release part

[0063] 8 Sensor plate

[0064] 9 retaining bolts

[0065] 10 Proximity sensor

[0066] II Recess 40 Sensor cable

Claims

Patent claims:

1. An electric motor with an electromagnetically actuated brake, wherein the brake has a tiltable, in particular rotatable, manual release part, in particular for manually releasing the brake, characterized in that a proximity sensor, in particular an inductive proximity switch, for detecting the tilted position of the manual release part is attached to a retaining ring, wherein the retaining ring completely surrounds and / or encompasses a magnetic body of the brake in the circumferential direction, in particular wherein the circumferential direction is related to the axis of rotation of the rotor shaft. ii 2. Electric motor according to claim 1, characterized in that the ring axis of the retaining ring is aligned coaxially with the axis of rotation of the rotor shaft of the electric motor and / or that the retaining ring is radially spaced from the magnetic body.

3. Electric motor according to one of the preceding claims, characterized in that the retaining ring has axially through holes for selectively fastening the proximity sensor, the proximity sensor protruding through a first of the holes.

4. Electric motor according to one of the preceding claims, characterized in that the retaining ring is held by retaining bolts which are fastened to a bearing plate of the electric motor, the bearing plate being axially spaced from the retaining ring.

5. Electric motor according to one of the preceding claims, characterized in that a sensor plate for detection by the proximity sensor is attached to the manual release part, in particular wherein the sensor plate is bent in a U-shape and the proximity sensor has a smaller distance to one leg of the U-shaped sensor plate than to the second leg of the U-shaped sensor plate.

6. Electric motor according to one of the preceding claims, characterized in that the manual release part has a recess into which a lever part can be inserted, in particular for easier manual actuation.

7. Electric motor according to one of the preceding claims, characterized in that an annular externally toothed driver is placed on the rotor shaft of the electric motor and is connected to the rotor shaft in a rotationally fixed manner, in particular by means of a key connection, wherein an annular disc-shaped brake pad carrier is placed with its internal toothing on the driver, in particular wherein the internal toothing is in engagement with the external toothing, so that the brake pad carrier is connected to the driver in a rotationally fixed manner and is arranged to be axially movable, wherein an armature disk is arranged axially between the brake pad carrier and the magnetic body, wherein the armature disk is connected to the magnetic body in a rotationally fixed manner and is axially movable, wherein spring elements supported on the magnetic body press on the armature disk.

8. Electric motor according to one of the preceding claims, characterized in that a brake shield is connected to the magnetic body via bolts which project through recesses in the armature disk.

9. Electric motor according to one of the preceding claims, characterized in that the retaining ring is held by, in particular, three retaining bolts which are connected to the bearing plate.

10. Electric motor according to one of the preceding claims, characterized in that the manual release part rests on the end face of the magnetic body axially remote from the bearing plate, in particular via a tilting bearing, in particular a rotary bearing, the tilting axis, in particular a rotational axis, of which is aligned perpendicular to the rotational axis of the rotor shaft.

11. Electric motor according to one of the preceding claims, characterized in that the manual release part is connected to at least one rod, in particular via a further rotary joint, the axial position depending on the tilt angle of the manual release part, the rod protruding through the magnetic body, the rod having a limiting means on the side of the armature disk axially facing away from the magnetic body, which limiting means limits the armature disk in the axial direction.

12. Electric motor according to one of the preceding claims, characterized in that the rod projects through the armature disk.

13. Electric motor according to one of the preceding claims, characterized in that the limiting means is a thickening of the rod or a part connected to the rod, in particular a nut screwed onto a threaded area of ​​the rod.

14. Electric motor according to one of the preceding claims, characterized in that the manual release part has a curved contour with which the manual release part rests against a flat surface area of ​​the end face of the magnet body.

15. Electric motor according to one of the preceding claims, characterized in that the lever part extends in a radial direction which has a non-zero angle to the first leg of the U-shaped sensor plate.

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