Electric motor comprising an angle sensor

Abstract

Electric motor comprising an angle sensor, wherein the housing of the angle sensor is connected to the second side wall of a torque support, in particular by means of screws, wherein the second side wall comprises a central hole and additional holes, the additional holes being radially spaced apart from the central hole.

Description

[0001] Electric motor having an angle sensor

[0002] Description:

[0003] The invention relates to an electric motor comprising an angle sensor.

[0004] It is well known that electric motors use an angle sensor to detect the rotational position of the rotor shaft.

[0005] An angle sensor arrangement is known from CN 1 12 448 547 A.

[0006] An electric motor with angle sensor and brake is known from DE 102022 004 809 A.

[0007] A brake is known from DE 102010 049 744 A1.

[0008] The invention is therefore based on the object of developing an electric motor, wherein the electric motor is operated efficiently, i.e. with a small construction volume under high load.

[0009] According to the invention, the object is achieved in the electric motor according to the features specified in claim 1.

[0010] Important features of the invention in the electric motor are that the electric motor has an angle sensor, wherein the housing of the angle sensor is connected to the second cheek of a torque support, in particular by means of screws, wherein the second cheek has a central bore and further bores, wherein the further bores are radially spaced from the central bore.

[0011] The advantage here is that the electric motor can be operated efficiently, i.e. with a small installation volume under high load. This is because the torque arm has two cheeks, which means that a powerful brake can be surrounded by the torque arm and yet still be cooled by an airflow because the second cheek has through-holes. The airflow conveyed by the fan therefore flows particularly around the magnet body of the brake and thus allows high torques to be decelerated or very inert or heavy loads to be held in position. It is therefore permissible to generate a high braking torque with the brake, in particular sliding friction braking torque and / or static friction braking torque. In addition, the two-cheek design of the torque arm allows the electric motor to operate robustly against load fluctuations, since the webs of the torque arm can be arranged radially outside the angle sensor.

[0012] In an advantageous embodiment, a solid shaft of the angle sensor is connected to the rotor shaft of the electric motor by means of a coupling. This is advantageous because misalignments caused by the braking torque can be compensated for by the coupling.

[0013] In an advantageous embodiment, the additional holes are evenly spaced from each other, particularly at regular intervals. It is advantageous that the second cheek can be made mechanically rigid.

[0014] In an advantageous design, the solid shaft extends through the central bore. This is advantageous because the coupling is surrounded and protected by the torque arm, especially during assembly.

[0015] In an advantageous embodiment, the screws, which are particularly axially directed, are arranged radially between the central bore and the other bores. This has the advantage that the rigidity of the second flange is not compromised.

[0016] In an advantageous embodiment, the radial direction is related to the rotational axis of the rotor shaft, in particular, the axial direction and the circumferential direction are also related to the rotational axis of the rotor shaft. It is advantageous that all directions are related to the rotational axis of the rotor shaft.

[0017] In an advantageous embodiment, the first cheek of the torque arm is attached to a bearing plate of the electric motor. It is advantageous that the torque arm is supported on the bearing plate of the motor. In an advantageous embodiment, the second cheek is connected to the first cheek by means of webs of the torque arm. It is advantageous that the webs are axially aligned, thus forming a torsionally rigid connection between the first cheek and the second cheek.

[0018] In an advantageous embodiment, the webs are spaced apart from each other in the circumferential direction, particularly evenly. This advantageously ensures that the connection between the two cheeks is torsionally rigid.

[0019] In an advantageous embodiment, each of the webs extends further in the circumferential direction than in the radial direction. This has the advantage of achieving high torsional rigidity.

[0020] In an advantageous embodiment, the second cheek has a triangular cross-section with rounded corners. This has the advantage of reducing vibration and thus making the second cheek mechanically rigid.

[0021] In an advantageous embodiment, the first cheek is annular. This is advantageous in that the rotor shaft can protrude through it and the air flow can be guided axially within the first cheek toward the electric motor.

[0022] In an advantageous embodiment, the torque arm surrounds a magnetic body of a brake of the electric motor. This is advantageous because the air flow surrounds the magnetic body, enabling robust operation.

[0023] In an advantageous embodiment, an annular recess is formed in the magnetic body, into which a coil is inserted, in particular wherein the annular axis of the recess is aligned coaxially to the axis of rotation of the rotor shaft, wherein an annular externally toothed driver is placed 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 an annular disc-shaped brake pad carrier is placed on the driver and is in engagement with the external toothing with its internal toothing, so that the brake pad carrier is connected to the driver and / or the rotor shaft in a rotationally fixed manner and is arranged to be axially movable, wherein a ferromagnetic 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 arranged to be axially movable, in particular by means of bolts protruding through recesses in the armature disk,which are inserted into boreholes in the magnet body, with spring elements supported on the magnet body pressing against the armature disc, particularly a braking surface formed on the bearing plate. The advantage here is that the brake automatically engages in the event of a power failure, as the spring elements then push the armature disc away from the magnet body toward the brake pad carrier, so that the brake pad carrier is pressed, on its side axially facing the armature disc, against the braking surface formed on the bearing plate or against a brake plate attached to the bearing plate.

[0024] In an advantageous embodiment, 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 de-energized, the armature disk is pressed onto the brake pad carrier, which is pressed onto the bearing plate on its side facing away from the armature disk, or onto a brake plate connected to the bearing plate on its side facing away from the armature disk. This increases safety, particularly during robust operation, i.e., operation under high torque fluctuations.

[0025] In an advantageous embodiment, the bearing plate has axially directed edge recesses on its end face facing the coupling device formed by the two flanges with a connecting region, particularly on its radially outer end region. The circumferential length of a first edge recess differs from the length of a second edge recess. This has the advantage of reducing the vibration capacity of the bearing plate, thus introducing fewer vibration modes into the coupling.

[0026] 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.

[0027] The invention will now be explained in more detail using schematic illustrations:

[0028] Figure 1 shows a sectioned side view of an electric motor according to the invention.

[0029] Figure 2 shows an oblique view of the bearing plate 2 of the electric motor.

[0030] Figure 3 shows a brake of the electric motor in an oblique view.

[0031] Figure 4 shows a coupling 4 of the electric motor in an oblique view.

[0032] Figure 5 shows the two-cheek torque support in an oblique view.

[0033] As shown in the figures, the electric motor has a stator housing 1 which is connected at its first axial end to a bearing plate 2 which accommodates a bearing for the rotatable support of the rotor shaft.

[0034] At its other axial end, the stator housing 1 is connected to a bearing flange, which accommodates a second bearing for the rotatable support of the rotor shaft.

[0035] A brake is integrated into the electric motor and attached to the bearing plate 1. For this purpose, the brake has a brake plate, which is connected to the bearing plate 1 by means of screws or is designed as a single piece, in particular one-piece, with the bearing plate.

[0036] A magnetic body 3 of the brake has an annular recess into which an electrically energizable coil is inserted.

[0037] A ring-shaped externally toothed driver is placed on the rotor shaft and is connected to the rotor shaft in a rotationally fixed manner, in particular by means of a key connection.

[0038] A ring-shaped brake pad carrier is mounted on the carrier and its internal toothing 30 engages the external toothing. Thus, the brake pad carrier is non-rotatably connected to the carrier and arranged to be movable in the axial direction. A ferromagnetic armature disk is arranged axially between the brake pad carrier and the magnet body 3. The armature disk is non-rotatably connected to the magnet body and arranged to be movable in the axial direction.

[0039] For this purpose, bolts are inserted into recesses in the magnet body, which protrude through recesses in the armature disk and are connected to the brake shield.

[0040] Spring elements supported on the magnet body 3 press against the armature disc. The brake shield is located on the side of the brake pad carrier axially facing away from the armature disc.

[0041] The brake shield is arranged on the side of the brake pad carrier axially facing away from the armature disc.

[0042] The rotor shaft extends through the magnetic body 3 and is connected to a coupling 4 on the side axially facing away from the bearing plate 2, which coupling is connected to a solid shaft of an angle sensor 5. The stationary part, in particular the housing, of the angle sensor is connected to a second cheek of the two-cheek torque support

[0043] The first cheek 50 of the torque arm is ring-shaped, with the corresponding ring axis aligned coaxially with the axis of rotation of the rotor shaft.

[0044] The first cheek 50 is connected to the second cheek 52 via a connecting region 7 with webs 51. The webs 51 extend further in the circumferential direction than in the radial direction. This ensures high stability and a rigid connection.

[0045] The second cheek 52 has a continuous central bore 53 and further continuous bores 54, which are radially spaced from the central bore 53. Preferably, all of these further continuous bores 53 are arranged at the same radial distance and spaced from each other in the circumferential direction, in particular evenly. A fan cover surrounds the torque arm and the angle sensor 5, with the torque arm surrounding and / or enclosing the brake.

[0046] An electrically operated fan is arranged in the fan cover 6, which draws in an air flow through grille openings in the fan cover and conveys this air flow to the stator housing 1. The air flow flows through the additional through holes 54 and thus first flows around the brake, in particular the magnet body 3, before reaching the stator housing 1.

[0047] Thus, the brake is also cooled by the airflow conveyed by the fan. The torque support, especially the second flange 52, thus creates only minimal flow resistance for the airflow.

[0048] The fan cover 6 is preferably made of plastic.

[0049] In further embodiments according to the invention, the fan cover 6 is made of sheet metal, in particular sheet steel. This allows for improved heat dissipation to the environment.

[0050] In further embodiments according to the invention, the bearing plate 2 has, on the end face facing the coupling device, which is formed from the connecting region 7 by means of the webs 51 and the cheeks (50, 52) connected thereto, in particular on its radially outer end region, axially directed edge recesses, the length of the edge recesses being different in the circumferential direction.

[0051] Preferably, in the circumferential direction, two first edge recesses, each having a first length in the circumferential direction, are followed by two second edge recesses, each having a second length in the circumferential direction. All edge recesses, in particular all first and second edge recesses, are spaced apart from one another in the circumferential direction. The second length is different from the first length.

[0052] These edge recesses, and in particular their longitudinal structure in the circumferential direction, reduce or prevent the formation of structure-borne sound vibration nodes on the bearing plate 2, thus introducing fewer vibration modes into the coupling device located on the front face. This allows for essentially undisturbed angle detection.

[0053] List of reference symbols

[0054] 1 stator housing

[0055] 2 bearing shield

[0056] 3 magnetic bodies

[0057] 4 Clutch

[0058] 5 Angle sensor

[0059] 6 Fan cover

[0060] 7 Connection area with webs 51

[0061] 30 Internal teeth of the brake pad carrier

[0062] 40 first clamping area

[0063] 41 bridge area

[0064] 42 second terminal area

[0065] 50 annular first cheek

[0066] 51 jetty

[0067] 52 second cheek

[0068] 53 Central bore

[0069] 54 Bore, especially axially continuous

Claims

Patent claims:

1. Electric motor, comprising an angle sensor, characterized in that the housing of the angle sensor is connected to the second cheek of a torque support, in particular by means of screws, wherein the second cheek has a central bore and further bores, wherein the further bores are radially spaced from the central bore.

2. Electric motor according to claim 1, characterized in that a solid shaft of the angle sensor is connected to the rotor shaft of the electric motor by means of a coupling.

3. Electric motor according to one of the preceding claims, characterized in that the further bores are evenly spaced from one another, in particular regularly.

4. Electric motor according to one of the preceding claims, characterized in that the solid shaft projects through the central bore.

5. Electric motor according to one of the preceding claims, characterized in that the screws, in particular axially directed, are arranged radially between the central bore and the further bores.

6. Electric motor according to one of the preceding claims, characterized in that the radial direction is related to the axis of rotation of the rotor shaft, in particular wherein the axial direction and the circumferential direction are also related to the axis of rotation of the rotor shaft.

7. Electric motor according to one of the preceding claims, characterized in that the first cheek of the torque support is attached to a bearing plate of the electric motor.

8. Electric motor according to one of the preceding claims, characterized in that the second cheek is connected to the first cheek by means of webs of the torque support.

9. Electric motor according to one of the preceding claims, characterized in that the webs are spaced apart from one another in the circumferential direction, in particular uniformly.

10. Electric motor according to one of the preceding claims, characterized in that each of the webs extends further in the circumferential direction than in the radial direction.

11. Electric motor according to one of the preceding claims, characterized in that the second cheek has a triangular cross-section with rounded corners.

12. Electric motor according to one of the preceding claims, characterized in that the first cheek is annular.

13. Electric motor according to one of the preceding claims, characterized in that the torque support surrounds a magnetic body of a brake of the electric motor.

14. Electric motor according to one of the preceding claims, characterized in that an annular recess is formed in the magnetic body, into which a coil is inserted, in particular wherein the annular axis of the recess is aligned coaxially with the axis of rotation of the rotor shaft, wherein an annular externally toothed driver is plugged 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 an annular disc-shaped brake pad carrier is plugged onto the driver and is in engagement with its internal toothing with the external toothing, so that the brake pad carrier is connected to the driver and / or the rotor shaft in a rotationally fixed manner and is arranged to be axially movable, wherein a ferromagnetic 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 arranged to be axially movable,in particular by bolts protruding through recesses in the armature disk, which are inserted into boreholes in the magnet body, whereby spring elements supported on the magnet body press on the armature disk, in particular a braking surface is formed on the bearing plate.

15. Electric motor according to one of the preceding claims, characterized in that when the coil is energized, the armature disk is pulled towards the magnetic body against the spring force generated by the spring elements and when the coil is not energized, the armature disk is pressed onto the brake pad carrier, which is pressed on its side facing away from the armature disk onto the bearing plate or onto a brake plate which is connected to the bearing plate.

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