Electric motor with a first angle sensor

Abstract

The invention relates to an electric motor with a first angle sensor. The electric motor has a fan cover which surrounds a fan of the electric motor, in particular so as to form a housing, wherein the fan suctions an air flow through screen openings of a fan cover screen of the fan cover and conveys same to the stator housing of the electric motor, and a connection plate radially protrudes from the housing of the first angle sensor, said connection plate being connected to a clamping means via a plate part, and the clamping means is pressed into screen openings of the fan cover screen.

Description

[0001] Electric motor with a 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 10 958 065 U.

[0009] The invention is therefore based on the object of developing an electric motor, whereby increased safety can be achieved simply and cost-effectively.

[0010] According to the invention, the object is achieved in the electric motor according to the features specified in claim 1.

[0011] Important features of the invention in the electric motor are that the electric motor is provided with a first angle sensor, wherein the electric motor has a fan cover which surrounds a fan of the electric motor, in particular forming a housing, wherein the fan sucks in an air flow through grille openings of a fan cover grille of the fan cover and conveys it to the stator housing of the electric motor, wherein a connecting plate projects radially on the housing of the first angle sensor and is connected to a clamping means via a sheet metal part, wherein the clamping means is pressed into grille openings of the fan cover grille.

[0012] The advantage here is that a secure connection of the torque support of the angle sensor is achieved.

[0013] In particular, the electric motor can even be equipped with two angle sensors, whose torque arms lead independently to the fan cover. This mechanically decouples the two angle sensors and thus increases safety.

[0014] In an advantageous embodiment, the clamping means comprises dome-shaped connecting areas that are pressed into the grid openings, with screws extending through holes in the sheet metal part and being screwed into the clamping means. Advantageously, the cross-section of the dome-shaped connecting areas can be adapted to the cross-section of the grid opening, thus ensuring a secure connection.

[0015] In an advantageous embodiment, the sheet metal part has an elongated hole through which a screw protrudes, which also protrudes through a hole in the connecting plate of the housing of the first angle sensor. This is advantageous because it allows for adaptation to dimensions and thus prevents distortion. This enables a secure connection.

[0016] In an advantageous embodiment, the first angle sensor is a hollow-shaft encoder, with the rotor shaft of the electric motor or a shaft part connected in a rotationally fixed manner to the rotor shaft of the electric motor extending through the hollow shaft of the first angle sensor. This allows for simple and reliable connection and operation.

[0017] In an advantageous embodiment, the electric motor has a second angle sensor, wherein at least one connecting plate protrudes radially from the housing of the second angle sensor and is connected to an annular intermediate plate, in particular by means of a screw passing through the connecting plate and the intermediate plate. The annular intermediate plate has two radially projecting beam regions, to each of which a respective bolt is fastened, which is connected to the fan cover grille on its side axially facing away from the annular intermediate part. This is advantageous in that redundant angle determination is enabled.

[0018] In an advantageous design, the head of a screw screwed into the bolt presses the fan cover grille against a step on the bolt. This is advantageous in that a secure connection can be achieved.

[0019] In an advantageous embodiment, the second angle sensor is a hollow shaft encoder, with the rotor shaft of the electric motor or a shaft part connected in a rotationally fixed manner to the rotor shaft of the electric motor extending into the hollow shaft of the second angle sensor. The advantage here is that the use of two identical angle sensors allows for cost-effective and simple production, allowing redundant angle determination.

[0020] In an advantageous embodiment, the area covered by the respective bolt in the axial direction encompasses the area covered by the first angle sensor in the axial direction. This is advantageous because the bolt enables the torque support of the second angle sensor to axially bridge the first angle sensor.

[0021] In an advantageous embodiment, the rotor shaft or a shaft part connected to the rotor shaft in a rotationally fixed manner protrudes through the annular opening of the annular intermediate plate. The advantage here is that the intermediate plate enables the axially spaced arrangement of the second angle sensor.

[0022] In an advantageous embodiment, a cover connected to the fan cover surrounds the first angle sensor and the second angle sensor, in particular forming a housing. This advantageously enables safe and secure operation. In an advantageous embodiment, the clamping means is arranged radially outside the first angle sensor. This advantageously allows a sheet metal part to be used for radial bridging.

[0023] In an advantageous embodiment, the bolt is arranged radially outside the second angle sensor. This allows the intermediate plate to be used for radial bridging.

[0024] In particular, the area covered by the clamping means in the axial direction comprises the area covered by the first angle sensor in the axial direction.

[0025] In an advantageous embodiment, the ring axis of the annular intermediate plate is aligned coaxially with the rotational axis of the rotor shaft. It is advantageous that the intermediate plate is aligned symmetrically.

[0026] In an advantageous embodiment, the clear inner diameter of the ring opening is smaller than the outer diameter of the first angle sensor. This is advantageous because the first angle sensor is arranged securely separated from the second.

[0027] In an advantageous embodiment, the first angle sensor is of the same construction, in particular identical, to the second angle sensor. This is advantageous because redundant operation of the angle sensors can be achieved in a simple and reliable manner.

[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. The invention will now be explained in more detail with reference to schematic illustrations:

[0029] Figure 1 shows a sectioned portion of an electric motor according to the invention.

[0030] Figure 2 shows an oblique view of the area.

[0031] Figure 3 shows a fan cover 3 of the electric motor in an oblique view.

[0032] Figure 4 shows a sheet metal part 20 of the electric motor in an oblique view.

[0033] Figure 5 shows a first angle sensor 1 of the electric motor in an oblique view.

[0034] Figure 6 shows an annular intermediate plate of the electric motor in an oblique view.

[0035] Figure 7 shows a hood 6 of the electric motor in an oblique view.

[0036] As shown in the figures, the electric motor has a fan cover 3, which is attached to a bearing plate of the electric motor, which 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 facing away from the bearing plate, is connected to a bearing flange, which has another bearing for rotatably supporting the rotor shaft.

[0037] The fan cover 3 surrounds a fan, which draws in an air flow through a fan cover grille of the fan cover 3 and conveys it along the stator housing.

[0038] The fan cover grille has grille openings which are formed on the fan cover 3 as a two-dimensional grille with a grille spacing.

[0039] A first angle sensor 1 is designed as a hollow shaft sensor. The housing of the first angle sensor 1 has a connecting plate 21 projecting radially from the first angle sensor 1. This connecting plate is connected to a sheet metal part 20, in particular by means of a screw projecting through an elongated hole in the sheet metal part 20, onto which a nut is screwed.

[0040] The sheet metal part 20 has two through holes through which screw parts protrude, which are screwed into a clamping means.

[0041] The clamping means has dome-shaped connecting areas that are pressed into the grille openings of the fan cover grille of the fan cover 3. Thus, the clamping means is positively connected to the fan cover 3 in the radial and circumferential directions and non-positively connected in the axial direction.

[0042] The axial direction is parallel to the rotor shaft's rotational axis. The radial direction and the circumferential direction are each related to the rotor shaft's rotational axis.

[0043] The screw parts press the sheet metal part 20 against the clamping device.

[0044] A second angle sensor 2 is also designed as a hollow shaft encoder and is arranged on the side of the first angle sensor 1 axially facing away from the stator housing.

[0045] Preferably, the first angle sensor 1 is constructed identically, in particular identically, to the second angle sensor 2.

[0046] On the housing of the second angle sensor 2, a connecting plate 22 is formed, which also protrudes radially and is connected to an annular intermediate plate.

[0047] The second angle sensor 2 protrudes through the annular opening of the annular intermediate plate. Radially projecting beam areas are formed on the annular intermediate plate, to which bolts 4 are attached. These bolts are fastened to the fan cover grille, in particular by means of a respective screw.

[0048] For this purpose, a screw is screwed into the respective bolt 4, the screw head of which presses the fan cover grille against the bolt 4. The rotor shaft protrudes through the first angle sensor 1 and through the second angle sensor 2 and is rotationally connected to the respective hollow shaft of the two angle sensors (1, 2).

[0049] The area covered by the bolts 4 in the axial direction includes the area covered by the first angle sensor 1 in the axial direction.

[0050] A cover 6 protects the two angle sensors (1, 2) and is connected to the fan cover 3.

[0051] List of reference symbols

[0052] 1 first angle sensor 2 second angle sensor

[0053] 3 Fan cover

[0054] 4 bolts

[0055] 5 intermediate plate

[0056] 6 hood 20 sheet metal part

[0057] 21 Connection plate of the housing of the first angle sensor 1

[0058] 22 Connection plate of the housing of the second angle sensor 2

Claims

Patent claims:

1. Electric motor with a first angle sensor, wherein the electric motor has a fan cover which surrounds a fan of the electric motor, in particular forming a housing, wherein the fan sucks in an air flow through grille openings of a fan cover grille of the fan cover and conveys it to the stator housing of the electric motor, characterized in that a connecting plate projects radially from the housing of the first angle sensor and is connected to a clamping means via a sheet metal part, wherein the clamping means is pressed into grille openings of the fan cover grille.

2. Electric motor according to claim 1, characterized in that the clamping means has dome-shaped connecting areas which are pressed into the grid openings, wherein screws protrude through holes in the sheet metal part and are screwed into the clamping means.

3. Electric motor according to one of the preceding claims, characterized in that the sheet metal part has an elongated hole through which a screw projects, which also projects through a hole in the connecting plate of the housing of the first angle sensor.

4. Electric motor according to one of the preceding claims, characterized in that the first angle sensor is a hollow shaft encoder, wherein the rotor shaft of the electric motor or a shaft part connected in a rotationally fixed manner to the rotor shaft of the electric motor projects through the hollow shaft of the first angle sensor.

5. Electric motor according to one of the preceding claims, characterized in that the electric motor has a second angle sensor, wherein on the housing of the second angle sensor at least one connecting plate projects radially, which is connected to an annular intermediate plate, in particular by means of a screw passing through the connecting plate and the intermediate plate, wherein the annular intermediate plate has two radially projecting beam regions, to each of which a respective bolt is fastened, which is connected to the fan cowl grille on its side axially facing away from the annular intermediate part.

6. Electric motor according to one of the preceding claims, characterized in that the screw head of a screw screwed into the bolt presses the fan cover grille against a step of the bolt.

7. Electric motor according to one of the preceding claims, characterized in that the second angle sensor is a hollow shaft encoder, wherein the rotor shaft of the electric motor or a shaft part connected in a rotationally fixed manner to the rotor shaft of the electric motor projects into the hollow shaft of the second angle sensor.

8. Electric motor according to one of the preceding claims, characterized in that the area covered by the respective 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 rotor shaft or a shaft part connected to the rotor shaft in a rotationally fixed manner passes through the annular opening of the annular intermediate plate.

10. Electric motor according to one of the preceding claims, characterized in that a cover connected to the fan cover carries the first angle sensor and the second Angle sensor, in particular housing-forming, surrounds.

11. Electric motor according to one of the preceding claims, characterized in that the clamping means is arranged radially outside the first angle sensor, wherein the area covered by the clamping means in the axial direction comprises the area covered by the first angle sensor in the axial direction.

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

13. Electric motor according to one of the preceding claims, characterized in that the ring axis of the annular intermediate plate is aligned coaxially with the axis of rotation of the rotor shaft.

14. Electric motor according to one of the preceding claims, characterized in that the clear inner diameter of the ring opening is smaller than the outer diameter of the first angle sensor.

15. Electric motor according to one of the preceding claims, characterized in that the first angle sensor is of the same construction, in particular identical, to the second angle sensor.

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