Electric motor with fan cowl and first angle sensor

Abstract

Disclosed is an electric motor with a first angle sensor (1) or rotary encoder, wherein the electric motor comprises a fan cowl (4) enclosing a fan, said fan cowl having a fan cowl grille with grille holes, wherein the housing of the first angle sensor (1) is fastened by means of a first bracket (6) and a clamping means (5) to the fan cowling (4) as torque brace, the clamping means (5) havening connecting portions that are inserted in grille holes of the fan cowling (4).

Description

[0001] ELECTRIC MOTOR WITH FAN COVER AND FIRST ANGLE SENSOR

[0002] Description:

[0003] The invention relates to an electric motor with a first angle sensor.

[0004] It is well known to determine the rotational position of the rotor shaft of an electric motor using an angle sensor.

[0005] From DE 10 2022 001 475 A1, the closest state of the art is an electric motor with a fan cover and sensor.

[0006] An angle sensor arrangement is known from CN 1 12 448 547 A.

[0007] A series of engines is known from DE 102 38 336 A1.

[0008] An electric motor with angle sensor is known from CN 2 13461 412 U.

[0009] An electric motor is known from CN 2 10 958 065 U.

[0010] The invention is therefore based on the object of operating an electric motor with increased safety.

[0011] According to the invention, the object is achieved in the electric motor according to the features specified in claim 1.

[0012] Important features of the invention in the electric motor with a first angle sensor are that the electric motor has a fan cover, in particular surrounding a fan, which has a fan cover grille with grille openings, wherein the housing of the first angle sensor is fastened to the fan cover by means of a first angle plate and a clamping means, in particular as a torque support, wherein the clamping means has, in particular dome-shaped, connecting areas which are inserted into grille openings of the fan cover grille.

[0013] The advantage here is that the fan cover is used as a torque support, with the connecting sections being inserted into the grille openings, i.e., protruding through them. By spacing the connecting sections slightly different from the grille spacing, a clamping effect can be achieved when plugging in.

[0014] Thus, the connecting areas are not only plugged in and thus positively connected to the fan cover in the radial and circumferential directions, but are also non-positively connected in the axial direction.

[0015] The first angle plate is designed to be stiffer in the circumferential direction than in the axial direction, enabling highly accurate angle determination.

[0016] In an advantageous embodiment, screwed parts screwed into the clamping device press the first angle plate against the clamping device. This ensures a robust connection.

[0017] In an advantageous embodiment, the clamping means is designed as a single piece, particularly as a cast part, particularly as a plastic injection-molded part or a metal cast part. This is advantageous because, with a plastic version, clamping in the fan cover grille is achieved with minimal force, while, with a metal version, highly precise angle determination is possible.

[0018] In an advantageous embodiment, the clamping means has a continuous groove on its side facing away from the connecting areas, particularly to form a constriction. This is advantageous because the respective screw part can be clamped very securely into the fan cover grille via the clamping means.

[0019] In an advantageous embodiment, a second angle sensor is arranged on the side of the first angle sensor axially facing away from the stator housing. This is advantageous in that redundant angle determination can be achieved, thus increasing the operational reliability of the electric motor. In an advantageous embodiment, the first angle sensor is a hollow shaft sensor, in particular the second angle sensor is a hollow shaft sensor. It is advantageous in that the rotor shaft or a shaft part rotationally connected to the rotor shaft extends through the first angle sensor and can be easily connected to the second angle sensor.

[0020] In an advantageous embodiment, the housing of the second angle sensor is connected to a bolt by means of a second sheet metal part, which is connected to another sheet metal part, which is connected to the fan cover by means of a further clamping means that is the same, in particular identical, to the clamping means. It is advantageous that two similar, in particular identical, clamping means can be used to clamp the two angle sensors.

[0021] In an advantageous embodiment, the area covered by the bolt in the axial direction encompasses the area covered by the first angle sensor in the axial direction. Advantageously, the torque support for the second angle sensor bridges the axial area of ​​the first angle sensor by means of the bolt.

[0022] In an advantageous embodiment, the bolt has a threaded area on both axial sides, which extends through the additional sheet metal part or the second sheet metal part. This is advantageous because it enables a screw connection to the sheet metal parts.

[0023] In an advantageous embodiment, the second sheet metal part is pressed against a first step of the bolt by a first nut screwed onto a first threaded portion of the bolt. This advantageously ensures a well-defined position of the second angle sensor.

[0024] In an advantageous embodiment, the additional sheet metal part is pressed against a second step of the bolt by a second nut screwed onto a second threaded portion of the bolt. This is advantageous in that a well-defined position of the second angle sensor is ensured.

[0025] In an advantageous embodiment, the fan cover is attached to the bearing plate of the electric motor, with the bearing plate being connected to a stator housing of the electric motor, and a bearing flange on the side of the stator housing axially facing away from the bearing plate being connected to the stator housing. This is advantageous in that the rotor shaft can be mounted stably and with high precision relative to the fan cover.

[0026] In an advantageous embodiment, the bearing plate accommodates a first bearing for the rotatable support of the rotor shaft, while the bearing flange accommodates a second bearing for the rotatable support of the rotor shaft. This is advantageous because a large bearing spacing can be achieved, thus enabling a highly precise support of the rotor shaft.

[0027] In an advantageous embodiment, the bolt is arranged radially outside the second angle sensor. In particular, the bolt is also arranged radially outside the first angle sensor. This is advantageous in that the torque can be supported with low forces, particularly on the fan cover made of sheet metal, and the second angle sensor is mounted more rigidly and thus less susceptible to vibration.

[0028] 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.

[0029] The invention will now be explained in more detail using schematic illustrations:

[0030] Figure 1 shows a section through an area of ​​an electric motor having a first angle sensor 1 and a second angle sensor 2.

[0031] Figure 2 shows an oblique view of the area in a first viewing direction.

[0032] Figure 3 shows an oblique view of the area in a second viewing direction.

[0033] Figure 4 shows the electric motor from a third viewing direction.

[0034] In Figure 5, a clamping means 5 for clamping a torque support is shown in an oblique view of the electric motor.

[0035] Figure 6 shows an angle plate 6 of the electric motor in an oblique view.

[0036] Figure 7 shows the first angle sensor 1 of the electric motor in an oblique view.

[0037] Figure 8 shows a bolt 20 of the electric motor in an oblique view.

[0038] Figure 9 shows the second angle sensor 2 in an oblique view.

[0039] In Figure 10, a second sheet metal part 21 is shown in an oblique view.

[0040] As shown in the figures, the electric motor has a fan surrounded by a fan shroud 4, which is attached to a bearing plate that accommodates a bearing for rotatably supporting the rotor shaft of the electric motor. The bearing plate is connected to a stator housing, which, on its side axially remote from the bearing plate, is connected to a bearing flange that accommodates another bearing of the rotor shaft.

[0041] The fan draws in an airflow that flows through a fan cover grille and is then conveyed along the stator housing by the fan. The fan cover grille has evenly spaced openings, forming a two-dimensional grid with a predetermined grid spacing.

[0042] The rotor shaft or a shaft part connected in a rotationally fixed manner to the rotor shaft projects through a central opening in the fan cover grille and is connected in a rotationally fixed manner to a shaft of the first angle sensor 1, the housing of which is connected to the fan cover 4 via a first angle plate 6, in particular a torque support plate.

[0043] For this purpose, a clamping means 5 with its connecting areas 50 is inserted into the fan cover grille. The four connecting areas 50, in particular, protrude through four respective grille openings.

[0044] The connecting areas 50 are pressed into the grid openings and have the same cross-section as the grid openings, so that the respective grid openings into which the connecting areas 50 are inserted are completely filled.

[0045] The first angle plate 6 is connected and clamped to the clamping means 5 by two screw parts 51, wherein the screw parts 51 are screwed into the clamping means 5 and the screw heads press the first angle plate 6 onto the clamping means 5.

[0046] The four connecting areas in particular each protrude in a dome shape on the clamping means 5 and are spaced apart from one another, in particular with the grid spacing.

[0047] A second angle sensor 2, which is further axially spaced from the fan cover 4, is also provided for detecting the angular position of the rotor shaft.

[0048] A shaft part of the second angle sensor 2 is also connected in a rotationally fixed manner to the rotor shaft and the housing of the second angle sensor 2 is connected via a second sheet metal part 21, which projects radially, to a bolt 20 extending in the axial direction, which in turn is connected to a further sheet metal part, which also projects radially, which is connected to a further clamping means 5, which is also inserted with its connecting regions 50 into grille openings of the fan cover grille.

[0049] The area covered by the bolt 20 in the axial direction comprises the area covered by the first angle sensor 1 in the axial direction. The first angle sensor 1 has a terminal box projecting radially from the first angle sensor 1. The second angle sensor 2 has a terminal box projecting radially from the first angle sensor 1.

[0050] Increased operational safety can be achieved through the redundancy of the angle determination with two angle sensors (1, 2).

[0051] Preferably, the first angle sensor 1 is designed as a hollow shaft encoder so that the rotor shaft or a shaft part connected to the rotor shaft in a rotationally fixed manner can extend through the first angle sensor 1 and be connected to the rotatable part, in particular the shaft, of the second angle sensor 2.

[0052] The axial direction is always parallel to the rotor shaft's rotational axis. The radial and circumferential directions are also related to the rotor shaft's rotational axis.

[0053] The clamping means 5 has a groove which is formed on the side of the clamping means 5 facing away from the connecting regions 50 and is arranged between the two screw parts 51.

[0054] The bolt 20 is arranged at a greater radial distance from the rotational axis of the rotor shaft 3 than the second angle sensor 2, in particular, than the radial outer circumference of the second angle sensor 2. Thus, although a large installation space is required in the radial direction, only small forces are needed for torque support. Furthermore, vibrations are suppressed.

[0055] In further embodiments according to the invention, the second angle sensor 2 is also designed as a hollow shaft sensor. List of reference symbols

[0056] 1 first angle sensor with connection box 2 second angle sensor

[0057] 3 Rotor shaft

[0058] 4 Fan cover

[0059] 5 clamping devices

[0060] 6 first angle plate, in particular torque support plate 20 bolts

[0061] 21 second sheet metal part, in particular torque support plate

[0062] 50 connection area

[0063] 51 screw part

Claims

Patent claims:

1. Electric motor with a first angle sensor, wherein the electric motor has a fan cover surrounding a fan, in particular, which has a fan cover grille with grille openings, characterized in that the housing of the first angle sensor is connected by means of a first angle plate and a clamping means is attached to the fan cover, in particular as a torque support, wherein the clamping means has, in particular dome-shaped, connecting areas which are inserted into grid openings of the fan cover grid.

2. Electric motor according to claim 1, characterized in that screw parts screwed into the clamping means press the first angle plate against the clamping means.

3. Electric motor according to one of the preceding claims, characterized in that the clamping means is designed in one piece, in particular as a cast part, in particular as a plastic injection-molded part.

4. Electric motor according to one of the preceding claims, characterized in that the clamping means has a continuous groove on its side facing away from the connecting regions, in particular for forming a constriction.

5. Electric motor according to one of the preceding claims, characterized in that a second angle sensor is arranged on the side of the first angle sensor axially facing away from the stator housing.

6. Electric motor according to one of the preceding claims, characterized in that the first angle sensor is a hollow shaft encoder, in particular wherein the second angle sensor is a hollow shaft encoder.

7. Electric motor according to one of the preceding claims, characterized in that the housing of the second angle sensor is connected by means of a second sheet metal part to a bolt which is connected to a further sheet metal part which is connected to the fan cover by means of a further clamping means which is the same, in particular identical, to the clamping means.

8. Electric motor according to one of the preceding claims, characterized in that the area covered by the bolt in the axial direction comprises the area covered by the first angle sensor in the axial direction.

9. Electric motor according to one of the preceding claims, characterized in that the bolt has a threaded area on both axial sides which projects through the further sheet metal part or the second sheet metal part.

10. Electric motor according to one of the preceding claims, characterized in that the second sheet metal part is pressed against a first step of the bolt by a first nut screwed onto a first threaded region of the bolt.

11. Electric motor according to one of the preceding claims, characterized in that the further sheet metal part is pressed against a second step of the bolt by a second nut screwed onto a second threaded region of the bolt.

12. Electric motor according to one of the preceding claims, characterized in that the fan cover is fastened to the bearing plate of the electric motor, wherein the bearing plate is connected to a stator housing of the electric motor, wherein a bearing flange on the side of the stator housing axially facing away from the bearing plate is connected to the stator housing.

13. Electric motor according to one of the preceding claims, characterized in that the bearing plate accommodates a first bearing for the rotatable mounting of the rotor shaft, wherein the bearing flange accommodates a second bearing for the rotatable mounting of the rotor shaft.

14. Electric motor according to one of the preceding claims, characterized in that the bolt is arranged radially outside the second angle sensor.

15. Electric motor according to one of the preceding claims, characterized in that the bolt is arranged radially outside the first angle sensor.

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