Electric machine with angle sensor

Abstract

The invention relates to an electric machine having an angle sensor, in which the housing of the angle sensor is connected, in particular by means of a screw, to a second side wall of a torque support, in which the second side wall has a central bore and a further bore, in which the further bore is radially spaced from the central bore.

Description

Field of the Invention

[0001] The present invention relates to an electric motor with an angle sensor. Background Art

[0002] As is known, an angle sensor is used in an electric motor to detect the rotational position of the rotor shaft. Summary of the Invention

[0003] Therefore, the object of the present invention is to improve an electric motor, in which the electric motor operates effectively, i.e., operates under high load and at the same time with a small structural volume.

[0004] According to the present invention, this object is achieved by an electric motor having the features given in claim 1.

[0005] In the electric motor, an important feature of the present invention is that the electric motor has an angle sensor, wherein the housing of the angle sensor is connected to the second side wall of the torque support, in particular by means of threaded elements.

[0006] wherein the second side wall has a central hole and additional holes.

[0007] wherein the additional holes are radially spaced apart from the central hole.

[0008] The advantage here is that the electric motor can operate effectively, i.e., operate under high load and at the same time with a small structural volume. Since the torque support is designed as a double-side wall type, an efficient brake can be surrounded by the torque support and still be cooled by the air flow, because the second side wall has through holes. Therefore, the air flow conveyed by the fan flows especially around the magnets of the brake, so that a high torque can be braked or a very inert or heavy load can be positioned. Thus, it is possible to generate a high braking torque, in particular a sliding friction braking torque and / or a static friction braking torque, by the brake. In addition, the double-wall nature of the torque support enables the electric motor to operate robustly with respect to load fluctuations, because the tabs of the torque support can be arranged radially outside the angle sensor.

[0009] In an advantageous design, the solid shaft of the angle sensor is non-rotatably connected to the rotor shaft of the electric motor by means of a coupling. The advantage here is that the misalignment of the coupling caused by the braking torque can be compensated.

[0010] In an advantageous design, the additional holes are evenly, in particular regularly, spaced apart from each other. The advantage here is that the second side wall can be designed to be mechanically rigid.

[0011] In an advantageous design, the solid shaft passes through the central hole. The advantage here is that the coupling - especially during assembly - is surrounded and protected by the torque support.

[0012] In an advantageous design, in particular axially directed threaded elements are arranged radially between the central hole and the further hole. The advantage here is that the rigidity of the second side wall is not endangered.

[0013] In an advantageous design, the radial direction is based on the axis of rotation of the rotor shaft,

[0014] in particular in that the axial direction and the circumferential direction are likewise based on the axis of rotation of the rotor shaft. The advantage here is that all directions are based on the axis of rotation of the rotor shaft.

[0015] In an advantageous design, the first side wall of the torque support is fixed to the bearing cover / end cover of the electric machine. The advantage here is that the torque support is supported at the bearing cover of the electric machine.

[0016] In an advantageous design, the second side wall is connected to the first side wall by means of tabs of the torque support. The advantage here is that the tabs are axially directed and thus form a torsionally rigid connection between the first side wall and the second side wall.

[0017] In an advantageous design, the tabs are spaced apart from one another in the circumferential direction, in particular evenly spaced apart from one another. The advantage here is that the connection of the two side walls is designed to be torsionally rigid.

[0018] In an advantageous design, each of the tabs extends further in the circumferential direction than in the radial direction. The advantage here is that a high torsional rigidity can be achieved.

[0019] In an advantageous design, the second side wall has a triangular cross-section with rounded corners. The advantage here is that the vibration capacity is reduced and thus the second side wall is designed to be mechanically rigid.

[0020] In an advantageous design, the first side wall is configured as a ring. The advantage here is that the rotor shaft can pass through and the air flow can likewise be led axially inside the first side wall towards the electric machine.

[0021] In an advantageous design, the torque support surrounds the magnet of the brake of the electric machine. The advantage here is that the air flow flows around the magnet and a robust operation can be achieved.

[0022] In an advantageous design, an annular recess is formed in the magnet, and the coil is inserted into the recess, in particular in that the axis of the ring of the recess is coaxial with the axis of rotation of the rotor shaft,

[0023] wherein an annular drive element with external teeth is slipped onto the rotor shaft and is connected to the rotor shaft in a non-rotatable manner, in particular by means of a key connection,

[0024] Herein, an annular brake pad carrier / brake block bracket is sleeved onto a driving member and meshes with an external tooth portion with its internal tooth portion, such that the brake pad carrier is connected to the driving member and / or the rotor shaft in a non - rotatable manner and is arranged in an axially movable manner.

[0025] Herein, a ferromagnetic armature plate is axially arranged between the brake pad carrier and the magnet. The armature plate is connected to the magnet in a non - rotatable manner and is arranged in an axially movable manner. In particular, a pin passes through an opening of the armature plate and is inserted into a drill hole of the magnet.

[0026] Herein, a spring element supported on the magnet presses against the armature plate.

[0027] In particular, a braking surface is formed on the bearing cover. The advantage here is that the brake engages automatically when power is off, because the spring element then moves the armature plate away from the magnet and presses it against the brake pad carrier, such that the brake pad carrier is pressed against the braking surface formed on the bearing cover or against a brake cover fixed to the bearing cover on the side axially away from the armature plate.

[0028] In an advantageous design, when the coil is energized, the armature plate is attracted towards the magnet against the spring force generated by the spring element, and when the coil is not energized, the armature plate is pressed against the brake pad carrier, which is pressed against the bearing cover on the side facing away from the armature plate, or against a brake cover connected to the bearing cover. The advantage here is that safety is improved, especially even during robust operation, i.e., operation with high torque fluctuations.

[0029] Further advantages are given by the dependent claims. The invention is not limited to the feature combinations of the claims. For a person skilled in the art, other reasonable combination possibilities of the claims and / or single - claim features and / or features of the description and / or features of the drawings can be obtained, especially from the purpose formulation and / or by comparison with the prior art. Description of the Drawings

[0030] The present invention will now be described in detail with reference to the schematic drawings:

[0031] In Figure 1 a cut - away side view shows an electric motor according to the present invention.

[0032] In Figure 2 a perspective view shows the bearing cover 2 of the electric motor.

[0033] In Figure 3 a perspective view shows the brake of the electric motor.

[0034] In Figure 4The coupling 4 of the electric machine is shown in an oblique view.

[0035] In Figure 5 a double-sided wall type torque support is shown in an oblique view.

[0036] List of reference numerals:

[0037] 1 Stator housing

[0038] 2 Bearing cover

[0039] 3 Magnet

[0040] 4 Coupling

[0041] 5 Angle sensor

[0042] 6 Fan cover

[0043] 7 Connection area with tab 51

[0044] 30 Inner tooth part of brake pad carrier

[0045] 40 First clamping area

[0046] 41 Tab area

[0047] 42 Second clamping area

[0048] 50 Annular first side wall

[0049] 51 Tab

[0050] 52 Second side wall

[0051] 53 Central hole

[0052] 54 Hole, especially an axially through hole Detailed description

[0053] As shown in the figure, the electric machine has a stator housing 1, which is connected to a bearing cover 2 at its first axial end, and the bearing cover receives a bearing for rotatably supporting the rotor shaft.

[0054] The stator housing 1 is connected to a bearing flange at its other axial end, and the bearing flange receives a second bearing for rotatably supporting the rotor shaft.

[0055] The brake is integrally arranged in the electric machine and fixed to the bearing cover 1. For this purpose, the brake has a brake cover, which is connected to the bearing cover 1 by means of threaded parts or is constructed integrally with, especially integrally with, the bearing cover.

[0056] The magnet 3 of the brake has an annular notch, and an energizable coil is inserted into the notch.

[0057] An annular carrier element with external teeth 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.

[0058] The annular brake pad carrier is mounted on the carrier and meshes with the outer toothing with its inner toothing 30. Therefore, the brake pad carrier is connected to the carrier in a rotationally fixed manner and is arranged in a movable manner in the axial direction.

[0059] The ferromagnetic armature plate is arranged axially between the brake pad carrier and the magnet 3. The armature plate is connected to the magnet in a rotationally fixed manner and is arranged so as to be movable in the axial direction.

[0060] For this purpose, pins are inserted into recesses in the magnets, which pins pass through openings in the armature plate and are connected to the brake cover.

[0061] The spring element supported on the magnet 3 presses against the armature plate. The brake cover is located on the side of the brake plate carrier facing away from the armature plate in the axial direction.

[0062] The brake cover is arranged on a side of the brake pad carrier which faces away from the armature plate in the axial direction.

[0063] The rotor shaft passes through the magnet 3 and is connected to a coupling 4 on the side facing away from the bearing cover 2 in a rotationally fixed manner, which is connected to a solid shaft of the angle sensor 5 in a rotationally fixed manner. The stationary part of the angle sensor, in particular the housing, is connected to the second side wall of the double-walled torque support.

[0064] The first side wall 50 of the torque support is annular, wherein the associated ring axis is coaxial with the rotation axis of the rotor shaft.

[0065] The first side wall 50 is connected to the second side wall 52 via a connecting region 7 having webs 51. The webs 51 extend further in the circumferential direction than in the radial direction. A highly stable and rigid connection is thus achieved.

[0066] The second side wall 52 has a through central hole 53 and further through holes 54 radially spaced apart from the central hole 53. Preferably, all these further through holes 53 are arranged at the same radial distance and spaced apart from each other in the circumferential direction, in particular spaced apart uniformly.

[0067] The fan guard surrounds the torque support and the angle sensor 5 , wherein the torque support surrounds and / or encloses the brake.

[0068] An electrically operable fan is arranged in the fan housing 6, which sucks in the air flow through the grille opening of the fan housing and conveys this air flow to the stator housing 1. Here, the air flow flows through a further through hole 54 and thus first flows around the brake, in particular the magnet 3, before reaching the stator housing 1.

[0069] The brake is thus also cooled by the air flow conveyed by the fan. The torque support, in particular the second side wall 52, thus only produces a small flow resistance for the air flow.

[0070] The fan housing 6 is preferably made of plastic.

[0071] In other embodiments according to the invention, the fan housing 6 is made of sheet metal, in particular steel sheet. An improved heat dissipation to the environment can thus be achieved.

Claims

1. An electric motor with an angle sensor, characterized in that, the housing of the angle sensor is connected to the second side wall of the torque support, in particular by means of threaded elements, the second side wall has a central hole and additional holes, the additional holes are radially spaced apart from the central hole.

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

3. The electric motor according to any one of the preceding claims, characterized in that, the additional holes are evenly spaced from each other, in particular regularly spaced from each other.

4. The electric motor according to any one of the preceding claims, characterized in that, the solid shaft passes through the central hole.

5. The electric motor according to any one of the preceding claims, characterized in that, in particular axially directed threaded elements are arranged radially between the central hole and the additional holes.

6. The electric motor according to any one of the preceding claims, characterized in that, the radial direction is based on the axis of rotation of the rotor shaft, in particular, the axial direction and the circumferential direction are also based on the axis of rotation of the rotor shaft.

7. The electric motor according to any one of the preceding claims, characterized in that, the first side wall of the torque support is fixed to the bearing cover of the electric motor.

8. The electric motor according to any one of the preceding claims, characterized in that, the second side wall is connected to the first side wall by means of tabs of the torque support.

9. The electric motor according to any one of the preceding claims, characterized in that, the tabs are spaced apart from each other in the circumferential direction, in particular evenly spaced from each other.

10. The electric motor according to any one of the preceding claims, characterized in that, each of the tabs extends further in the circumferential direction than in the radial direction.

11. The electric motor according to any one of the preceding claims, characterized in that, the second side wall has a triangular cross-section with rounded corners.

12. The electric motor according to any one of the preceding claims, characterized in that, the first side wall is configured as a ring.

13. The electric motor according to any one of the preceding claims, characterized in that, the torque support surrounds the magnet of the brake of the electric motor.

14. The electric motor according to any one of the preceding claims, characterized in that, a ring-shaped recess is formed in the magnet, and a coil is inserted into the ring-shaped recess. In particular, the axis of the recess is coaxial with the axis of rotation of the rotor shaft, a ring-shaped drive member with an external tooth portion is sleeved on the rotor shaft and non-rotatably connected to the rotor shaft, in particular by means of a key connection, a ring-shaped brake pad carrier is sleeved on the drive member and the inner tooth portion of the brake pad carrier meshes with the external tooth portion, so that the brake pad carrier is non-rotatably connected to the drive member and / or the rotor shaft and is axially movable, a ferromagnetic armature plate is axially arranged between the brake pad carrier and the magnet, wherein the armature plate is non-rotatably connected to the magnet and is axially movable. In particular, a pin passes through an opening of the armature plate and the pin is inserted into a drilled hole of the magnet, a spring element supported on the magnet presses against the armature plate, In particular, a braking surface is formed on the bearing cover.

15. The electric machine according to any one of the preceding claims, characterized in that when the coil is energized, the armature plate is attracted towards the magnet against the spring force generated by the spring element, and when the coil is not energized, the armature plate is pressed against the brake pad carrier which, on its side facing away from the armature plate, is pressed against the bearing cover or against a brake cover connected to the bearing cover.

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