Motor with fan cover, rotor shaft and angle sensor

Abstract

The invention relates to an electric machine having a fan cover, a rotor shaft which is rotatably mounted relative to the fan cover, and an angle sensor, wherein a housing of the angle sensor is connected to a torque support which is connected to the fan cover, wherein the torque support has a meander-shaped leg portion.

Description

TECHNICAL FIELD

[0001] The invention relates to an electric machine having a fan cover, a rotor shaft which is rotatably supported relative to the fan cover, and an angle sensor. BACKGROUND

[0002] It is generally known that an angle sensor for detecting the angular position of a rotor shaft can be arranged on an electric machine. SUMMARY

[0003] It is therefore an object of the invention to improve an electric machine, wherein a simple and cost-effective production should be possible.

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

[0005] An important feature of the invention in the context of electric machines is that the electric machine is provided with a fan cover, a rotor shaft which is rotatably supported relative to the fan cover, and an angle sensor,

[0006] wherein the housing of the angle sensor is connected with a torque support which is connected with the fan cover,

[0007] wherein the torque support has legs which are meandering and / or serpentine, in particular legs which are spaced apart from one another in the circumferential direction,

[0008] and / or wherein

[0009] the torque support has legs, in particular legs which are spaced apart from one another in the circumferential direction, which repeatedly have a circumferential angle which first increases and then decreases as the radial distance from the rotational axis of the rotor shaft increases,

[0010] wherein the respective leg and / or each leg has regions which are radially spaced apart from one another in the respective circumferential angle range, in particular within the circumferential angle range covered by the respective leg.

[0011] An advantage here is that tolerances can be compensated for by means of the torque support and a rigid connection in the circumferential direction can nevertheless be achieved. The housing of the angle sensor is thus connected with the fan cover in a manner which cannot rotate relative to one another and a reaction torque is thereby introduced.

[0012] In the axial direction and the radial direction, tolerances of the components can be simply compensated for by means of the torque support. Cost-effective components can thus be produced and assembled simply, i.e. without particular outlay.

[0013] In an advantageous embodiment, the housing is connected to the inner ring of the torque support by means of the first and second connection areas of the torque support. This has the advantage that a planar contact of the inner ring is achieved and thus the connection plane is aligned with the housing of the angle sensor.

[0014] In an advantageous embodiment, the torque support has a web region, in particular one protruding radially outward, to which the fan guard is connected. This has the advantage that a flat contact with the fan guard is achieved and that the associated connecting plane is thus aligned with the fan guard, in particular its fan grille. The torque support can be used to compensate for manufacturing tolerances.

[0015] In an advantageous embodiment, the respective web regions are connected to the inner ring by means of legs. This has the advantage that the torque support has the web regions at a greater radial distance than the inner ring, so that the legs bridge this radial distance. However, the circumferential angular range over which the respective legs are connected to the inner ring is preferably different from the circumferential angular range over which the legs are connected to the respective web regions. This allows for a more efficient arrangement of the meanders, since the meanders begin with their first winding tangentially or circumferentially from the connection region and, after several windings, also tangentially or circumferentially into one of the web regions.

[0016] In an advantageous embodiment, the corresponding tab region is pressed onto the fan guard by means of corresponding fixing elements, in particular screws. Advantageously, the fixing elements extend through the recesses in the tab region and through the grille openings of the fan grille of the fan guard and then act in a compressive manner on both sides when the nuts are screwed on, i.e., they press the tab region onto the fan guard, in particular in a form-fitting manner.

[0017] In an advantageous embodiment, the inner ring and / or the connecting region are pressed onto the housing of the angle sensor by means of screws. This has the advantage that simple fixing can be achieved.

[0018] In an advantageous embodiment, the web region is radially spaced apart from the inner ring and the connecting region.

[0019] The radial direction is based on the axis of rotation of the rotor shaft. Advantageously, the meander can be formed tangentially or in the circumferential direction with its first and last turns.

[0020] In an advantageous embodiment, the corresponding connecting region is spaced apart from the corresponding web region in the circumferential direction. Advantageously, the meandering portion with its first and last loops tangentially or in the circumferential direction leads into the connecting region or web region.

[0021] In an advantageous embodiment, the radial distance region covered by the legs, relative to the axis of rotation of the shaft, is arranged between the radial distance region covered by the web region and the radial distance region covered by the connecting region, or overlaps with the radial distance region covered by the web region and the radial distance region covered by the connecting region. Advantageously, the legs are connected. Preferably, each two of the legs open into a corresponding web region and, at their other ends, into one of the connecting regions. The legs are spaced apart from one another in the circumferential direction.

[0022] In an advantageous embodiment, the rotor shaft is rotatably mounted by means of a bearing received in a bearing flange of the electric machine.

[0023] The fan guard is connected to the bearing flange, in particular, fastened to it. This has the advantage that the reaction torque of the angle sensor housing can be dissipated to the bearing flange via the torque support and the fan guard. Conversely, the rotor shaft of the electric motor is connected to the shaft of the angle sensor.

[0024] In an advantageous embodiment, the angle sensor has a shaft that is rotatable relative to the housing of the angle sensor and is connected to the rotor shaft in a rotationally fixed manner. This has the advantage that the angular position of the rotor shaft can be detected.

[0025] In an advantageous embodiment, the torque support is designed as a flat stamped plate, wherein the normal of the plane containing the stamped plate is parallel to the axis of rotation of the rotor shaft. This has the advantage that a high rigidity can be achieved in the circumferential direction, i.e., with rotational movement within the plane.

[0026] In an advantageous embodiment, the web area rests parallel to the fan grille of the fan guard. This has the advantage that a rigid embodiment in the circumferential direction can be achieved and the torsional rigidity of the torque support can also be combined with a corresponding torsionally rigid fan guard.

[0027] In an advantageous embodiment, the housing of the angle sensor is arranged on the side of the fan guard facing away from the bearing flange. This has the advantage that the angle sensor protrudes on the side facing away from the rotor shaft.

[0028] Further advantages are provided by the dependent claims. The invention is not limited to the feature combinations of the claims. Other suitable combinations of the claims and / or features of individual claims and / or features of the description and / or features of the drawings will appear to a person skilled in the art, particularly based on the objectives presented and / or from a comparison with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Now the present invention is described in detail according to the schematic diagram:

[0030] exist Figure 1 1 shows a sectional view of an electric machine according to the invention, which has an angle sensor for detecting the rotor position of a rotor shaft of the electric machine.

[0031] exist Figure 2 , a torque support is shown in an oblique view, which is connected on the one hand to the housing 2 of the angle sensor and on the other hand to the fan guard 9 of the electric motor.

[0032] exist Figure 3 The torque support is shown in Figure 2 Top view of .

[0033] exist Figure 4 The motor is shown in an exploded view from an oblique angle.

[0034] exist Figure 5 In FIG. 1 , the angle sensor and the fan guard 9 are shown exploded from the housing part 7 of the electric motor, wherein the torque support 1 is connected to the fan guard 9 in a rotationally fixed manner by means of screws 42 . DETAILED DESCRIPTION

[0035] As shown in the figures, the electric machine according to the invention comprises a rotatably mounted rotor shaft 5, onto which an active part 4 is placed and connected to it in a rotationally fixed manner, wherein the active part 4 comprises, in particular, a squirrel cage or permanent magnets, depending on the embodiment of the electric machine as an asynchronous machine or a synchronous machine.

[0036] At least one of the bearings rotatably supporting the rotor shaft 5 is accommodated in a bearing flange 11, which is releasably, but particularly rotationally fixedly connected to the housing part 7. The stator winding 6 is arranged radially within the housing part 7 and is rotationally fixedly connected thereto.

[0037] On the side of the bearing flange 11 facing away from the stator winding 6 , a fan guard 9 is fixed to the bearing flange 11 , which radially surrounds the fan 8 , which is connected to the rotor shaft 5 in a rotationally fixed manner.

[0038] Though fan guard 9 has fan grille, particularly promptly is arranged in the breach of the penetration in the grille, makes the air flow of being delivered by fan pass through fan grille.On the other hand, fan guard 9 has realized protection function, and its method is, prevents people from contacting the parts of supporting in the mode that can rotate.

[0039] The fan guard 9 is either made of plastic as a plastic injection-molded part or made of sheet metal as a punched and bent part.

[0040] The angle sensor for detecting the angular position of the rotor shaft 5 has a shaft 3 which is rotatable relative to a housing 2 of the angle sensor, in particular is mounted so as to be rotatable relative to the housing 2 of the angle sensor.

[0041] The housing 2 of the angle sensor is connected to the torque support 1 , which is connected to the fan guard 9 .

[0042] The torque support 1 is designed in such a way that it has a high rigidity for a rotation directed in the circumferential direction with reference to the rotor shaft 5 between the housing part 2 of the angle sensor and the fan guard 9, i.e. in particular for a torsional rotation, compared to an axially directed translation and a radially directed translation.

[0043] In this way, manufacturing tolerances of components, such as the fan guard with bearing flange 11 and / or the rotor shaft 5 with angle sensor shaft 3, can be compensated. In particular, tolerances in the axial extent or in the axial direction can lead to axial misalignment of the housing 2, which can, however, be compensated by the torque support 1 being less rigid in the axial direction.

[0044] The torque removal is not affected thereby, since the torque support 1 is torsionally very rigid, and the housing 2 is therefore connected to the bearing flange via the fan guard 9 in a sufficiently rotationally fixed manner.

[0045] The shaft 3 of the angle sensor is connected in a rotationally fixed manner to the rotor shaft 5. Preferably, a force-locking connection, such as an expansion shaft connection or a tapered shaft connection, is used for this purpose.

[0046] The angle sensor generates a sensor signal which encodes the angular position of the rotor shaft 5 relative to the housing part 7. The angle sensor is designed either according to a magnetic or an optical principle of action.

[0047] The bearing of the rotor shaft 5 , which is received in the bearing flange 11 , is preferably designed as a fixed bearing. Even an embodiment as a floating bearing is possible, since the torque support 1 connects the housing of the angle sensor to the fan guard 9 .

[0048] The torque support 1 rests on the preferably flat fan grille of the fan guard 9 and is fixed to the fan guard 9 in a rotationally fixed manner by means of at least one fastening element 10 , in particular a screw element with a nut.

[0049] A shaft sealing ring is accommodated in the bearing flange axially between the housing 2 and the fixed bearing, which seals the bearing flange toward the rotor shaft 5. For this purpose, the sealing lip of the shaft sealing ring rests on the rotor shaft 5 and contacts it.

[0050] The torque support 1 has a radially outwardly protruding web area 22 on its radial outer edge, through which one of the fixing elements 10, in particular a threaded element, is respectively guided, and the fixing element also protrudes through the grille of the fan guard 9, in particular so that the threaded element head of the fixing element 10, which is preferably designed as a threaded element, and the nut screwed onto the threaded area of ​​the fixing element 10 press the torque support 1 onto the fan guard 9.

[0051] The torque support 1 has, at its radially inner end region, an inner ring 23 which is connected to the web region 22 via preferably four legs 24 , which are designed in a meandering manner.

[0052] Here, in Figure 2 and Figure 3 In the preferred embodiment shown in FIG, two of the legs 24 are connected to the inner ring 23 in a first connection region, which covers a first circumferential angular range. An axially continuous recess 25 is arranged in this first connection region, through which a further fastening element is guided, which connects the torque support 1 to the housing 2 of the angle sensor, in particular presses it against the latter. The further fastening element is preferably also designed as a screw, the head of which presses the torque support 1 against the housing 2 when it is screwed into an axially oriented threaded hole in the housing 2.

[0053] Likewise, a second connection region is formed on the inner ring 23 diametrically opposite the first connection region, which covers a second circumferential angular range. An axially continuous second recess 25 is arranged in this second connection region, through which a further second fixing element is guided. This further second fixing element also connects the torque support 1 to the housing 2 of the angle sensor, in particular presses it against the latter. This further second fixing element is preferably also designed as a threaded element, the head of which presses the torque support 1 against the housing 2 when it is screwed into another axially directed threaded hole in the housing 2.

[0054] Two of the legs 24 are connected with their radially inner end regions to the first connecting region and with their radially outer connecting regions to the first of the web regions 22 .

[0055] The two other legs 24 are connected with their radially inner end regions to the second connecting region and with their radially outer connecting regions to the second web region 22 .

[0056] The first web region 22 is arranged diametrically opposite the second web region 22 , ie in particular substantially spaced apart by approximately 180° in the circumferential direction.

[0057] The meander-like structure of the respective leg 24 is arranged within a plane defined by the torque support 1 , which is preferably designed as a stamped sheet metal part.

[0058] Preferably, the meandering area is designed such that as the radial distance increases, the first of the two legs 24 first has a circumferential angle that increases to a maximum value, then has a circumferential angle that decreases to a minimum value, and then the circumferential angle increases again until the first leg reaches the circumferential angle range covered by the web area 22.

[0059] In further exemplary embodiments according to the invention, the meandering course of the legs 24 changes more frequently with increasing radial distance from the axis of rotation of the rotor shaft and reaches a maximum or minimum value correspondingly more frequently.

[0060] As in Figure 2 and Figure 3 As shown in FIG, the meandering course of the second of the two legs 24 is mirror-symmetrical in the circumferential direction to the plane containing the rotation axis of the rotor shaft and the center point of the recess 26 and / or the center of gravity of the first web region 22 (the first leg).

[0061] Preferably, the other two legs 24 are also designed to be mirror-symmetrical to the aforementioned legs 24 .

[0062] Because the torque support 1 is manufactured from sheet metal as a flat, planar stamped part, the corresponding meander, i.e., the corresponding meander-like leg 24, lies in a plane whose normal is parallel to the axis of rotation of the rotor shaft and has a very high torsional stiffness with respect to twisting relative to the axis of rotation. This allows for low-error angle detection using the angle sensor.

[0063] In the axial direction, the axial position of the web area 22 relative to the inner ring 23 can be shifted with little effort, since the torque support 1 does not have a high stiffness for such a shift. Thus, manufacturing tolerances can be compensated without deteriorating the angle detection.

[0064] Likewise, radial deviations can be absorbed by elastic deflection of the web region 22 relative to the inner ring 23 .

[0065] The legs 24 are preferably regularly spaced apart from one another in the circumferential direction.

[0066] Preferably, the inner ring 23 rests on the housing 2 of the angle sensor.

[0067] In particular, each leg 24 with its meandering course covers a circumferential angular range which covers an angle of more than 60° and extends in particular over less than 90°.

[0068] Thus, there is an angular difference of more than 60° between the maximum and the minimum, wherein the angular difference is less than 90°.

[0069] The legs 24 are spaced apart from each other in the circumferential direction.

[0070] The fan guard 9 itself, in particular the grille of the fan guard 9 , is designed to be stiffer than the torque support 1 .

[0071] The radial distance region covered by the legs 24 is arranged between the radial distance region covered by the inner ring 23 and the radial distance region covered by the web region 22 .

[0072] The circumferential angular range covered by the first web region 22 is spaced apart from the circumferential angular range covered by the first connecting region by more than 60°. The circumferential angular range covered by the second web region 22 is spaced apart from the circumferential angular range covered by the first connecting region by more than 60°.

[0073] An optimal shape of the meander can thus be achieved, ie as many meander loops as possible can be achieved over a small radial distance region.

[0074] Accordingly, the angle between a connecting line connecting the centers of gravity of two web regions 22 and a connecting line connecting the centers of gravity of two connecting regions is greater than 60°, in particular 90°.

[0075] If the two connecting lines are preferably aligned perpendicular to one another, the angle sensor can detect the angle value with high precision, since the torsional stiffness has the same value in the circumferential direction and opposite to the circumferential direction, i.e., has no preferred direction. This applies even when there are axial and radial tolerances.

[0076] The torque support 1 , ie the torque support component, is designed integrally and in one piece as a stamped part.

[0077] As Figure 4 and Figure 5 As can be seen, a nut 40 is welded to the side of the torque support 1 facing the fan guard 9. The nut 40 is thus materially connected to the torque support 1. Screws 42 protruding through recesses 41 in the fan guard are screwed into the nut 40. Consequently, the respective screw heads of the respective screws 42 press the fan guard 9 onto the respective nut 40, so that the torque support is connected to the fan guard 9 in a form-fitting manner via the screws 42.

[0078] The housing part 2 of the angle sensor is connected in a form-fitting, ie rotationally fixed, manner in the circumferential direction by means of a pin 43 passing through the torque support 1. Preferably, the pin 43 is inserted into a bore of the housing 2 in a force-fitting manner.

[0079] Since the fan guard 9 is also connected to the housing part 7 , in particular the stator housing, by means of screws in a form-fitting manner, the torque is dissipated from the housing 2 of the angle sensor via the torque support 1 and via the fan guard 9 to the housing part 7 .

[0080] The torque support 1 is therefore arranged on the inside of the fan guard 9 and is therefore protected by the fan guard 9 from environmental influences.

[0081] List of reference numerals:

[0082] 1 Torque support

[0083] 2 Angle sensor housing, especially the stator

[0084] 3. The shaft of the angle sensor, especially the rotor shaft

[0085] 4 Active components

[0086] 5 Rotor shaft

[0087] 6 Stator winding

[0088] 7 Housing components

[0089] 8 fans

[0090] 9 Fan cover

[0091] 10 Fasteners, especially threaded parts with nuts

[0092] 11 Bearing flange

[0093] 22 Splice area

[0094] 23 Inner Ring

[0095] 24 designed with sinuous legs

[0096] 25 Gap

[0097] 26 Gap

[0098] 40 Nut

[0099] 41 Gap

[0100] 42 threaded parts

[0101] 43 pins

Claims

1. A motor comprising a fan guard, an angle sensor, and a rotor shaft rotatably supported relative to the fan guard, The housing of the angle sensor is connected to the torque support, and the torque support is connected to the fan cover. It is characterized by: The torque support has a meandering and / or serpentine-shaped leg, The torque support has a leg portion having a circumferential angle that increases and then decreases repeatedly with increasing radial distance from the rotation axis of the rotor shaft. Each leg has regions that are radially spaced apart from one another in a corresponding circumferential angular range.

2. The motor according to claim 1, It is characterized by: The housing is connected to the inner ring of the torque support by means of a first connection region and a second connection region of the torque support.

3. The motor according to claim 2, It is characterized by: The torque support has a web region, to which the fan guard is connected.

4. The motor according to claim 3, It is characterized by: Each web region is connected to the inner ring by means of a leg.

5. The motor according to claim 3, It is characterized by: Each web region is pressed onto the fan guard by means of corresponding fixing elements.

6. The motor according to claim 2, It is characterized by: The inner ring and / or the first and second connecting regions of the torque support are pressed onto the housing of the angle sensor by screws.

7. The motor according to claim 3, It is characterized by: The web region is radially spaced apart from the inner ring and radially spaced apart from the first connection region and the second connection region, The radial direction is based on the axis of rotation of the rotor shaft.

8. The motor according to claim 3, It is characterized by: Each connecting region is spaced apart from the corresponding web region in the circumferential direction.

9. The motor according to claim 3, It is characterized by: With respect to the rotation axis of the rotor shaft, a radial distance region covered by the leg is arranged between a radial distance region covered by the web region and a radial distance region covered by the first connecting region and the second connecting region, or overlaps with a radial distance region covered by the web region and a radial distance region covered by the first connecting region and the second connecting region.

10. The motor according to claim 1, It is characterized by: The rotor shaft is rotatably supported by means of a bearing received in a bearing flange of the electric machine. The fan cover is connected to the bearing flange.

11. The motor according to claim 1, It is characterized by: The angle sensor has a shaft that is rotatable relative to a housing of the angle sensor and is connected to the rotor shaft in a rotationally fixed manner.

12. The motor according to claim 1, It is characterized by: The torque support is designed as a flat stamped plate, wherein the normal to the plane containing the stamped plate is parallel to the axis of rotation of the rotor shaft.

13. The motor according to claim 3, It is characterized by: The web area rests parallel to the fan grille of the fan guard.

14. The motor according to claim 1, It is characterized by: The housing of the angle sensor is arranged on the side of the fan guard facing away from the bearing flange.

15. The motor according to claim 1, wherein: The legs are spaced apart from each other in a circumferential direction.

16. The motor according to claim 3, characterized in that The torque support has a web region which projects radially outwards.

17. The motor according to claim 5, characterized in that The fixing member is a threaded member.

18. The motor according to claim 10, characterized in that The fan cover is fixed on the bearing flange.

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