Electric motor and method for manufacturing an electric motor

Abstract

Electric motor with fan (20), comprising a rotatable rotor, in particular rotatable about a rotor axis, and a stator (12) arranged in a housing part (1), in particular wherein the stator (12) is force-fit connected to the housing part (1), wherein a fan hood (2) is connected to the housing part (1), wherein the fan cover (2) is clipped on, i.e. snapping into place, connected to the housing part (1), characterized by the fact that a connection device (17) is screwed to the housing part (1), in particular wherein the connection device (17) is at least partially enclosed by the terminal box lower part forming part of the housing, wherein spring elements are received in the connection device (17) into which lines are inserted in a respective actuation direction, wherein an imaginary straight line in the actuation direction, in particular in extension of the end area of ​​the respective line, meets the inner wall of the terminal box lower part formed on the housing part (1), in particular thus an insertion of the lines with the connection device (17) screwed together in the terminal box lower part is possible.

Description

[0001] The invention relates to an electric motor and a method for manufacturing an electric motor.

[0002] An electric motor has a stator and a rotatably mounted rotor, with the rotor arranged radially inside the stator. To improve heat dissipation, fans are known that are arranged at an axial end region of the rotor shaft. For personnel protection, a fan hood is fitted around the fan and screwed to the motor housing.

[0003] The closest state of the art is known from US 2002 0 090 307 A1.

[0004] An air-cooled electric machine is known from DE 10 2004 015 241 A1.

[0005] An electric motor with encoder is known from DE 10 2008 028 658 A1.

[0006] An electric motor with encoder is also known from DE 10 2008 028 603 A1.

[0007] An electric motor is known from DE 10 2004 027 653 A1.

[0008] An electric motor is also known from DE 10 2008 028 622 A1.

[0009] The invention is therefore based on the objective of further developing an electric motor, whereby simple and cost-effective manufacturing should be made possible.

[0010] According to the invention, the problem is solved in the electric motor according to the features specified in claim 1 and in the method according to the features specified in claim 13.

[0011] Important features of the invention for the electric motor are that it comprises a rotatably mounted rotor, in particular rotatably about a rotor axis, and a stator arranged in a housing part, in particular wherein the stator is positively connected to the housing part, where a fan hood is connected to the housing part, the fan cover is clipped on, i.e., snapped into place, and connected to the housing part.

[0012] The advantage here is that it allows for simple manufacturing while still providing a positive-locking and therefore axially secure connection. In particular, this also enables quick and easy tool-free connection during manufacturing, maintenance, and similar procedures.

[0013] In an advantageous embodiment, the fan hood has a cam projecting radially inwards, In particular, the cam has an insertion chamfer. An advantage of this is that a one-piece design of the cam is possible, especially in the case of the fan housing manufactured as a plastic injection-molded part.

[0014] In an advantageous embodiment, a circumferentially limiting guide for the cam is formed. An advantage of this is that circumferential rotation is prevented when the fan cover is clipped onto the motor housing.

[0015] In an advantageous embodiment, the motor housing has a radially outwardly projecting cam with an insertion ramp onto which the cam of the fan housing, particularly with its insertion ramp, can be slid in the axial direction and engages after overcoming the cam of the motor housing. The advantage here is that simple connection with minimal effort and a positive locking mechanism for securing the fan housing to the motor housing can be achieved.

[0016] In a preferred embodiment, the cam formed on the motor housing engages in a thinning area or in a recess of the fan shroud. A further advantage is that the engagement can be implemented in a simple manner.

[0017] In an advantageous embodiment, a shoulder or a support cam for absorbing axial compressive forces is formed on the motor housing, extending axially along the cam formed on the motor housing. This ensures that the cam formed on the fan housing is axially supported by the shoulder or support cam, particularly in that the cam's axial end face is supported by the shoulder or support cam. The advantage of this is that axial forces can be absorbed, thus improving safety and service life.

[0018] In an advantageous embodiment, the fan shroud is elastically deformed when slid on and clipped into place, i.e., snapped into position, thus ensuring a play-free connection between the fan shroud and the motor housing. The advantage here is that a play-free connection can be achieved by generating a corresponding contact force through the elastic deformation.

[0019] In an advantageous embodiment, a bearing for the rotor shaft is arranged in a housing part. It is advantageous that the housing surrounding the stator can be formed from two parts, since the housing part in which the stator is received, and in particular is positively connected, also provides a bearing seat for receiving the bearing. Thus, an additional bearing shield for receiving the bearing and its connection to the housing part is not required.

[0020] In an advantageous embodiment, the housing part is cup-shaped, and the bearing can be arranged on the bottom of the cup, in particular in a recess in the housing part that has a bearing seat for receiving the outer ring of the bearing. An advantage of this is that the housing part can thus be slipped onto the bearing, which can first be mounted onto the rotor shaft. Furthermore, improved heat dissipation is enabled, since the one-piece design of the housing part allows the heat generated, for example, by the stator windings and / or the bearing to dissipate without the need for additional heat transfer points.

[0021] In an advantageous embodiment, the housing part, particularly on its side facing away from the pot base, and especially on the axially opposite side, is detachably connected to a bearing shield in which a bearing for the rotor shaft is housed. An advantage of this is that the bearing shield and the housing part can form a substantially closed housing, thus providing protective enclosure for the stator, which also houses the rotor shaft bearings.

[0022] In an advantageous embodiment, the housing component has a centering collar to which the bearing shield can be connected with its corresponding counter-centering surface. The advantage here is that precise alignment of the bearings can be achieved without readjustment or similar measures. Thus, alignment of the bearings is accomplished solely through the shape of the components.

[0023] In an advantageous embodiment, a terminal box base is formed integrally with the housing part. The advantage here is that no additional part needs to be joined or stored; instead, the housing part can be produced as a single casting with the terminal box base cast onto it. The walls of the terminal box base are high enough to extend above the connection device, i.e., the connection elements for electrical conductors.

[0024] In an advantageous embodiment, the base of the junction box can be closed by a cover, which is screwed to the housing. It is advantageous that a flat or at least shallow cover can be used to cover the junction box. A domed design of the cover provides increased stability and allows water to run off, thus reducing the risk of corrosion. Furthermore, a smooth surface on the outside of the cover can be provided for labeling. The domed shape also allows for visual and design-related emphasis.

[0025] According to the invention, a connection device is screwed to the housing part, in particular wherein the connection device is at least partially enclosed by the terminal box base forming part of the housing. An advantage of this is that the connection device can be connected easily and quickly, and after connection, the insertion and thus the electrical connection of the conductors leading from the outside into the terminal box base with the conductors leading from the stator winding can be achieved by means of the spring elements.

[0026] According to the invention, spring elements are incorporated into the connection device, into which conductors are inserted in a respective actuation direction. An imaginary straight line in the actuation direction, particularly extending from the end region of the respective conductor, intersects the inner wall of the terminal box base formed on housing part 1. This allows, in particular, the insertion of the conductors with the connection device screwed into the terminal box base. An advantage of this is that electrical connection is possible with the connection device screwed into the terminal box base, in such a way that the conductors can be routed within the terminal box base.

[0027] In a preferred embodiment, the rotor shaft is supported by the bearing in the housing part and by the additional bearing in the end shield. The advantage here is that bearing arrangements can be implemented in the two interconnected parts.

[0028] In an advantageous embodiment, at least one recess is arranged in the lower part of the connection box, in particular in the wall, wherein a section of the housing part is thickened towards the stator from the recess and / or at least a section of a wall of the terminal box base is thickened, particularly to improve heat dissipation and heat transfer of the heat transferred from the stator into the housing part, especially in the area of ​​the pronounced terminal box base. Advantageously, the heat generated by the stator is thus also dissipated in the area of ​​the terminal box base, where no cooling fins can be installed, and is then more effectively transferred towards the terminal box base and from there to the surrounding environment. In particular, short-term heat flux peaks are also better absorbed due to the increased heat capacity resulting from the thickening.

[0029] In an advantageous embodiment, the thickened wall area of ​​the housing part surrounds the recess at least partially in such a way that a positive locking mechanism is provided to prevent rotation, particularly for a nut or locknut of a cable gland arranged at the recess. It is advantageous that the nut of a cable gland can be secured against rotation on the base of the junction box without an additional part.

[0030] In an advantageous embodiment, the thickened wall area prevents rotation of a nut or locknut, particularly if the nut or locknut is formed as an external hexagon on its outer circumference. It is advantageous that the thickened wall area, as a full or half internal hexagon, surrounds the recess on the inside of the wall area of ​​the housing part. In this way, an anti-rotation device can be provided in a simple manner, allowing heat to flow via the anti-rotation device to the metal nut or locknut, thus further improving heat dissipation from the stator. The nut or locknut, optionally with connected parts, is extended along the electrical supply lines, thereby increasing the surface area of ​​the housing part with respect to heat dissipation to the environment.

[0031] In an advantageous embodiment, a fan is arranged at an axial end region of the rotor shaft, in particular wherein a fan housing at least partially surrounds the fan, and in particular wherein the fan housing is clipped to the housing part 1. An advantage of this is that a quick and easy connection of the fan is possible. Furthermore, assembly can be carried out from the same direction as the other parts, thus enabling the one-dimensional serial assembly of the motor in both time and space.

[0032] Key features of the method for manufacturing an electric motor are that the motor can be mounted from a single axial side, wherein - in a first step a bearing is inserted into a bearing shield, in particular from a first axial side, - in a second step a rotor shaft is inserted into the bearing, in particular from the first axial side, - in a third step, another bearing is placed on the rotor shaft and inserted, particularly from the first axial side, - in a fourth step, a pot-shaped housing part, in particular with which a stator is connected and surrounded by the housing part in a housing-forming manner, onto which further bearings are placed, is inserted, in particular from the first axial side.

[0033] One advantage is that it can be manufactured quickly and easily. Furthermore, it allows for improved heat dissipation.

[0034] In a preferred design, a fan is finally attached to the rotor shaft and a fan shroud to the housing. The advantage here is that improved heat dissipation can be achieved.

[0035] In an advantageous embodiment, a recess for the passage of a cable through the wall of the terminal box lower part of the housing part, in particular by means of a cable gland, is produced by removing, in particular knocking out, a knockout area from the housing part manufactured as a casting.

[0036] Further advantages arise from the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent, in particular from the problem statement and / or the problem arising from a comparison with the prior art.

[0037] The invention will now be explained in more detail with the help of illustrations: In the Fig. Figure 1 shows a cross-sectional view through the electric motor according to the invention. In the Fig. Figure 2 shows a corresponding oblique view with the lid 16 closed. In the Fig. Figure 3 shows a corresponding oblique view with the lid 16 open. In the Fig. Figure 4 shows an oblique view of the fan hood, so that the interior can be seen. In the Fig. Figure 5 is a related section showing an enlarged view of a recess in the fan cover. In the Fig. Figure 6 shows an oblique view of the fan hood from the outside. In the Fig. Figure 7 shows the electric motor with attached fan cover 2, where the fan cover is shown partially cut off. In the Fig. Figure 8 shows an enlarged section of the corresponding area, revealing an insertion ramp of a cam on the engine housing.

[0038] The motor has a housing part 1, which is manufactured as a single casting, in particular as a die-cast part. Preferably, aluminum or at least an aluminum alloy is used. A terminal box base is also formed on the housing part.

[0039] Thus, after placing a cover 16 on the terminal box base of the housing part 1, a connection area is enclosed to form the housing, in which connection devices (17, 19) can be arranged.

[0040] Housing part 1 also has a recess that is machined to serve as a bearing seat. A shaft seal seat is also located adjacent to this. Thus, the B-side end of the rotor shaft 9 can be supported in housing part 1. For this purpose, bearing 3 can be positioned at the bearing seat, and it is spaced from a retaining ring 5, which is located in an annular groove of the housing recess, by means of a compensating ring 4. Axially on the other side of the retaining ring 5, the shaft seal 6 is located at the shaft seal seat. The bearing seat and shaft seal seat are therefore arranged in a through-bore and can be machined in a single setup. The bore is not stepped, but has a single diameter.

[0041] The bearing 3 is arranged axially such that the stator winding area overlaps with the axial area of ​​the bearing 3 that is stressed by the bearing 3. The housing part 1 is shaped to project radially inwards, i.e., radially below the stator windings, into the axial area of ​​the stator windings.

[0042] The fan shroud is positively connected, in particular by clipping, to the housing part 1 at its axial end region, in particular the B-side of the motor. It surrounds the fan 20, which in turn is positively connected to the rotor shaft 9.

[0043] The rotor shaft 9 is supported at its A-side, i.e., output side, by a bearing 10 in a bearing shield 11, which is designed as a housing part and closes the essentially pot-shaped housing part 1 like a lid. The bearing shield 11 and the housing part are preferably made of cast material, in particular cast steel or die-cast aluminum. However, versions made of plastic are also possible if a weight-reduced variant is required.

[0044] The bearing 10 is axially arranged between a step of the receiving bore and a retaining ring 7, and is thus axially fixed. The rotor shaft also has a step in this area against which the inner ring of the bearing 10 rests, which is likewise axially fixed by means of another retaining ring. Thus, the B-side bearing is designed as a fixed bearing. The A-side bearing 3 is designed as a floating bearing, with its inner ring also resting against a step of the rotor shaft 9. However, thermal expansion of the rotor shaft 9 is accommodated by means of the compensating washer. A seal is provided on the A-side to the environment by means of a shaft seal 8. The bearing shield 11 is not only tightly connected to the housing part 1, but also has a centering collar that engages with a corresponding projection on the housing part for mutual centering.

[0045] The stator windings of the stator 12 surround the active part arranged on the rotor shaft 9, which is designed as a squirrel cage or as permanent magnets. Thus, the motor can be configured as an asynchronous motor or as a synchronous motor.

[0046] The lower part of the junction box in housing part 1 has recesses to accommodate locknuts, enabling a sealed cable entry and cable gland. The inner wall of the lower part of the junction box in housing part 1 has an inwardly projecting thickening shaped to prevent rotation of a locknut with a correspondingly shaped outer circumference. Preferably, the outer circumference of the locknut (18) is hexagonal and thus secured against rotation in a semi-hexagonal projecting (13, 14) wall thickening.

[0047] The thickening on the lower part of the terminal box is not only designed to prevent rotation, but also extends radially to the portion of housing part 1 that surrounds the stator. In this way, the thickening acts as a heat conductor, improving heat dissipation from the stator to the lower part of the terminal box, which thus functions like an enhanced cooling fin. Furthermore, the stability is improved, thereby reducing vibration and noise emission in the outer area of ​​the thickened section of the lower part of the terminal box.

[0048] This results in more uniform heat dissipation around the stator's circumference. This is because the housing section lacks cooling fins in the area of ​​the terminal box base. However, the heat dissipation capacity of the missing cooling fins is improved by the thickened design of the terminal box base. The wall thickness is preferably between 2 and 3 mm. In the thickened area, the wall thickness is increased by more than 1 mm, i.e., it is at least 3 or 4 mm thick.

[0049] The thickened wall not only improves heat dissipation but also allows for the formation of one or more nut pockets for nuts or locknuts of cable glands, which are arranged in a respective recess of the terminal box base. These recesses can be designed, for example, as through holes or unmachined holes.

[0050] Inside the lower part of the terminal box, a screw 15 is arranged, by means of which a connection device 17 is screwed to the housing part 1. Thus, the winding leads of the stator windings can be connected to the leads supplying the motor via this connection device 17. For this purpose, the winding leads and the aforementioned supply leads are each inserted into the connection device 17 in one direction of operation and connected there with a metallic connector. The connector thus establishes an electrical connection between the leads and / or, by means of the connectors and their connection, the motor can be operated in a star or delta connection.

[0051] It is important that the direction of actuation is designed to allow the insertion of the respective cables within the base of the junction box. The cables are generally rigid and therefore not very flexible. Consequently, the direction of actuation is limited by the recess in the terminal device 17 into which the cable is to be inserted. This recess is designed as a substantially round hole, the axis of which is aligned with the direction of actuation. A spring element is provided in the recess, into whose slot the cable can be inserted and securely connected, thus also enabling an electrical connection. The recess is located in a surface portion of the terminal device 17, which is substantially flat and whose normal direction is essentially aligned with the direction of actuation.The direction of actuation may exhibit a small angle to the normal direction, which can also be described as the opening angle. The actuation angle, particularly within the area of ​​the opening angle, is oriented such that the respective cable is to be inserted into the connection device 17 within the terminal box base. The wall of the terminal box area of ​​the terminal box base is therefore arranged within the area of ​​the opening angle of the recess.

[0052] Thus, with the connection device 17 screwed in, it is possible to insert the cables within the space enclosed by the base of the junction box. This is possible despite the fact that the imaginary line of actuation intersects the inner wall of the base of the junction box in the direction of actuation.

[0053] The conductor inserted into the respective recess of the connection device in the direction of actuation can be either a stator conductor, i.e., a conductor connected to a winding wire of the stator conductor, or a conductor routed through the cable gland. The number of recesses in the connection device is correspondingly high. The recesses in the essentially flat surface area are preferably designed as a regular linear arrangement.

[0054] The connection device is vibration-resistant when connected to the housing part via a screw connection.

[0055] The terminal box base is closed off by a cover 16, so that the connection device 17 and another connection device 19 are enclosed.

[0056] A fan 20 is arranged at the B-side end region of the rotor shaft 9, with whose cooling airflow not only cools the housing part 1 in the area of ​​the terminal box lower part but also the other surface areas of the housing part 1, along which cooling fins extend in the axial direction.

[0057] Threaded holes are provided in locally limited thickenings of the cooling fins, so that a nameplate 21 placed on the cooling fins can be screwed to the fins of the housing part 1.

[0058] Manufacturing the motor is particularly simple, as assembly is possible from a single axial side. Therefore, fully automated production is possible. For this purpose, the shaft seal 8 is first inserted into the bearing shield 11, followed by the bearing 10, after which the associated retaining ring 7 is inserted.

[0059] The rotor shaft 9 is then connected to the bearing 10. Next, the bearing 3 is placed onto the rotor shaft 9. The bearing 3 has a through bore, not a stepped bore. This allows the assembly to be performed from only one direction.

[0060] The pot-shaped housing part 1, in which the stator is already arranged, is then placed over it. Now the retaining ring 5 and the shaft seal 6 can also be installed.

[0061] Finally, the fan wheel 20 and the fan shroud 2, which clips into the housing part 1, can be mounted. The clip-in connection has the particular advantage that the fan shroud can also be mounted by approaching it from the same direction. Thus, all the aforementioned parts are brought in from only one direction, and the motor can be mounted at the same time. This enables particularly simple manufacturing and a high degree of automation.

[0062] To establish the electrical connections, the connection device 17 in the terminal box base is screwed to the housing part 1. Then, the leads coming from the stator are inserted with their ends into the recesses of the connection device 17 in the direction of actuation and are positively engaged in a spring contact, thus electrically connecting them to the spring contact.

[0063] Similarly, the externally coming cables, guided through the cable glands encompassing the lock nut (18), are also guided with their ends in the direction of actuation into their respective elongated recesses of the connection device 17, i.e., insertion openings 23 of the connection device 17, and connected to the corresponding spring contact of the connection device, thereby creating the electrical connections between the cables coming from the stator and the externally coming cables. The spring acts transversely to the direction of the cable, i.e., the insertion direction of the cable into the insertion opening, and thus presses the cable against an edge. To remove the cable, the positive connection is released by overcoming the spring force with an actuating element 24 of the connection device, thus ending and preventing the spring from pressing against the inserted cable.For this purpose, the spring is deflected accordingly in a transverse direction to the direction of the conductor or the insertion direction of the conductor into the insertion opening 23. This enables simple and non-destructive removal of the conductor.

[0064] The positive connection between the stripped ends of the conductors is achieved by inserting the stripped ends through a slot in the spring element at a shallow angle, particularly less than 40° or even less than 20° between the conductor and the slot walls, thus enabling insertion with minimal force. The spring element is manufactured as a thin-walled stamped and bent part. However, this results in high static friction when withdrawing the conductor, as the thin-walled slot walls bear against the conductors at a large angle, particularly more than 140° or even 160°, and therefore cut into the surface during withdrawal. Consequently, removal requires considerable force – and this process deforms or even chips the conductor.

[0065] When making the electrical connection of the wires, it is important that no screw connection is required; the wires simply need to be inserted with sufficient force. This is even possible with the connection device 17 screwed to the housing part 1, i.e., after the connection device 17 has been screwed to the housing part 1.

[0066] In the embodiment according to the invention, the aforementioned recess for receiving the cable gland in the raw casting is closed, i.e., it has a knock-out area. Such recesses are found in Fig. 3 on the opposite side. Symbols applied to the outside of each knockout area (22, 25) clearly indicate to a person skilled in the art how to remove the respective knockout area (22, 25) using a tool. Preferably, the wall thickness is 0.5 mm to 1 mm. Thus, several such knockouts are provided in the lower part of the junction box, and the recesses required for cable glands can be easily broken out.

[0067] In Fig. The type plate 21, mounted on the cooling fins, is also visible at point 3.

[0068] As in Fig. As shown in Figure 4, the fan housing has a fan grille 41, so that when the fan is axially mounted on the motor housing (housing part 1), protection against contact with the fan 20 by the operator's fingers is ensured. Thus, air flows axially into the fan 20, is deflected radially by the fan 20 (which is designed as a radial fan), and is deflected axially by means of the beveled area 71 of the fan housing 2, so that the air exiting the fan flows along the cooling fins of the motor housing 1.

[0069] The fan shroud 2 can also be made of sheet metal. However, plastic is preferably used; in particular, the fan shroud is manufactured as an injection-molded part.

[0070] On its inside, the fan hood has 2 reinforcing ribs 42 which run in the axial direction and are spaced apart from each other in the circumferential direction, in particular irregularly to reduce the tendency to vibrate.

[0071] At four points in the circumferential direction, in particular in flattened partial areas of the fan hood 20, recesses 44 are arranged, which are designed as holes in the wall and in another embodiment as thinned wall areas, i.e. as depressions arranged on the inside of the fan hood.

[0072] In the axial direction, a reinforcing rib 43 adjoins each of the recesses 44. Thus, the recesses 44 do not reduce the stability of the fan housing 2, nor do they increase the tendency to vibrate.

[0073] The respective reinforcing rib 43 widens in the axial direction, thus increasing in width in the circumferential direction, which further reduces the tendency to vibrate, especially in combination with the reinforcing ribs 42, which do not increase in width in the circumferential direction in the axial direction.

[0074] On the axial side of the recess 44 facing away from the reinforcing rib 43, a cam projecting radially inwards is formed on the fan hood 2, which has an insertion ramp. 51, so that the fan cover 2 can be slid onto a correspondingly shaped insertion ramp 81 of a cam 82 formed on the motor housing 1. During this sliding process, the fan cover 2, which is preferably made of plastic, is elastically deformed. At the end of the sliding process, the cam of the fan cover 20 overcomes the cam 82, and the fan cover 2 is clipped into the motor housing. The cam 82 then projects into the recess 44.

[0075] In Fig. Figure 8 shows the clipped connection area in more detail. The radially outward projecting cam 82, formed on the motor housing 1, is shown, which has the insertion ramp 81 on which the insertion ramp 51 of the radially inward projecting cam formed on the fan cover 2 can slide during connection.

[0076] A further support cam 83, formed on the motor housing 1, is axially spaced from the cam 82 to absorb axial compressive forces. After the fan cover 2 is clipped on, and while axial compressive forces continue to act on the fan cover, the cam formed on the fan cover is supported by the support cam 83 with its axial end face. Thus, these axially acting compressive forces are absorbed.

[0077] The fan cover is also positively connected to the motor housing 1 by means of an elastic deflection or tension that remains even after clipping. The clip connection represents a positive connection, particularly in the axial direction, but also in the circumferential direction.

[0078] Overall, the fan shroud is thus connected to the motor housing 1 without play and securely, in particular with overload capacity against axial forces, thereby preventing rattling during operation and also reducing the tendency to vibrate.

[0079] The cams 83 and 82 are arranged on a thickened and radially enlarged rib, which is offset in the circumferential direction and runs parallel to the further cooling ribs 84 formed on the motor housing 1. Thus, good heat dissipation is achieved.

[0080] In Fig.Figure 6 shows the fan hood grille arranged at the axial end of the fan hood 20 in more detail, wherein the grille is designed as a square grille and the edge of a recess 62 for the passage of a shaft, for example shaft of an angle sensor, is reinforced by means of additional connecting ribs 61, which are arranged diagonally in the squares adjacent to the edge.

[0081] Preferably, a lateral guide is also provided to prevent the fan hood from rotating in the circumferential direction when it is slid onto the motor housing.

[0082] In a further embodiment according to the invention, the spring elements are connected to each other in such a way that it is possible to connect the motor in a star or delta configuration.

[0083] In a further embodiment according to the invention, an electromagnetically actuated brake is arranged on the B-side between the fan and the housing part 1. Reference symbol list 1 housing part 2 fan hood 3 bearings, B-side 4 compensating rings 5 retaining ring 6 shaft seal 7 retaining ring 8 Shaft seal 9 Rotor shaft 10 bearings, B-side 11 Bearing plate, A-side 12 Stator 13 Wall thickening as an anti-rotation device for a lock nut 14 Wall thickening as anti-rotation device for lock nut 18 15 screws 16 lids 17 Connection device 18 locknuts 19 additional connection devices 20 fans 21 Type plate 22 Knockout 23 Insertion opening of the connection device 17 24 Actuating element 25 Knockout 41 fan grilles 42 reinforcing ribs 43 axially widening reinforcing rib, axially aligned with the recess 44 44 Exclusion 51 Lead-in chamfer of the cam formed on the fan shroud 61 connecting ribs for reinforcement 62 Recess for carrying out a wave 71 beveled area for air deflection 81 Lead-in ramp 82 cams formed on the engine housing 83 Support cam for absorbing axial compressive force 84 cooling fins

Claims

[1] Electric motor with fan (20), comprising a rotatable rotor, in particular rotatable about a rotor axis, and a stator (12) arranged in a housing part (1), in particular wherein the stator (12) is force-fit connected to the housing part (1), wherein a fan hood (2) is connected to the housing part (1), wherein the fan cover (2) is clipped on, i.e. snapping into place, connected to the housing part (1), characterized by , that a connection device (17) is screwed to the housing part (1), in particular wherein the connection device (17) is at least partially enclosed by the terminal box lower part forming part of the housing, wherein spring elements are received in the connection device (17) into which lines are inserted in a respective actuation direction, wherein an imaginary straight line in the actuation direction, in particular in extension of the end area of ​​the respective line, meets the inner wall of the terminal box lower part formed on the housing part (1), in particular thus an insertion of the lines with the connection device (17) screwed together in the terminal box lower part is possible. [2] Electric motor according to claim 1, characterized by , that the fan cover (2) has a cam (82) projecting radially inwards, in particular wherein the cam (82) has an insertion ramp (51), in particular, wherein a guide effective in the circumferential direction is formed for the cam. [3] Electric motor according to at least one of the preceding claims, characterized by, that the motor housing has a radially outward projecting cam (82) which has an insertion ramp (51) on which the cam (82) of the fan cover (2), in particular with its insertion ramp (51), can be slid in an axial direction and engages after overcoming the cam of the motor housing. [4] Electric motor according to at least one of the preceding claims, characterized by , that the cam (82) formed on the motor housing engages in a thinning area or in a recess (44) of the fan cover (2). [5] Electric motor according to at least one of the preceding claims, characterized by, that a shoulder or a support cam (83) is formed on the motor housing axially following the cam (82) formed on the motor housing for receiving axial compressive force, so that the cam (82) formed on the fan hood (2) is axially supported on the shoulder or support cam (83), in particular wherein the cam (82) is supported with its axial end face on the shoulder or support cam (83). [6] Electric motor according to at least one of the preceding claims, characterized by , that the fan cover (2) is elastically deformed when slid on and clipped on, i.e. snapping into place, so that a backlash-free connection between the fan cover (2) and the motor housing is provided. [7] Electric motor according to at least one of the preceding claims, characterized by , that a bearing of the rotor shaft (9) is arranged in a housing part (1), and / or that the housing part (1) is cup-shaped and the bearing can be arranged on the bottom of the cup, in particular in a recess (44) of the housing part (1) in the bottom of the cup, which has a bearing seat for receiving the outer ring of the bearing, and / or that the housing part (1), in particular on its side facing away from the bottom of the pot, in particular on the axially opposite side, is detachably connected to a bearing shield (11) in which a bearing for the rotor shaft (9) is received, and / or that the housing part (1) has a centering collar to which the bearing shield (11) can be connected with its corresponding counter-centering surface. [8] Electric motor according to at least one of the preceding claims, characterized by , that a terminal box base is formed in one piece on the housing part (1). [9] Electric motor according to at least one of the preceding claims, characterized by , that the terminal box lower part can be closed, in particular closed, by a cover part which is screwed to the housing part (1), in particular where the lid part is curved. [10] Electric motor according to at least one of the preceding claims, characterized by , that the rotor shaft (9) is supported via the bearing in the housing part (1) and via the further bearing in the bearing shield (11), and / or that a fan (20) is arranged at an axial end region of the rotor shaft (9), in particular wherein a fan hood (2) at least partially surrounds the fan (20) forming a housing, in particular wherein the fan hood (2) is clipped to the housing part (1). [11] Electric motor according to at least one of the preceding claims, characterized by , that at least one recess (44) is arranged in the lower part of the junction box, in particular in the wall, wherein from the recess (44) to the stator (12) an area of ​​the housing part (1) is thickened and / or at least an area of ​​a wall of the terminal box lower part is thickened, in particular to improve the heat spreading and heat dissipation of the heat dissipated from the stator (12) into the housing part (1), in particular in the area of ​​the pronounced terminal box lower part. [12] Electric motor according to at least one of the preceding claims, characterized by , that the thickened wall area of ​​the housing part (1) surrounds the recess (44) at least partially in such a way that a positive locking anti-rotation device, in particular for a nut or locknut (18) of a cable gland arranged on the recess (44) is provided, in particular wherein the thickened wall area prevents a nut or locknut (18) from rotating, in particular wherein the nut or locknut (18) is shaped as an external hexagon on its outer circumference. [13] Method for manufacturing an electric motor according to at least one of the preceding claims, characterized by , that the motor can be mounted from a single axial side, whereby - in a first step a bearing is inserted into a bearing shield (11), in particular from a first axial side, - in a second step a rotor shaft (9) is inserted into the bearing, in particular from the first axial side, - in a third step another bearing is placed on the rotor shaft (9) and inserted, in particular from the first axial side, - in a fourth step, a pot-shaped housing part (1), in particular with which a stator (12) is connected and surrounded by the housing part (1) in a housing-forming manner, onto which further bearings are placed, is inserted, in particular from the first axial side, - in a fifth step a fan (20) is clipped onto the rotor shaft (9) and a fan cover (2) is clipped onto the motor from the axial side in an axial direction, in particular, wherein finally a fan (20) is placed on the rotor shaft (9) and a fan cover (2) is placed on the housing part (1), in particular wherein a recess (44) for passing a cable through the wall of the terminal box lower part of the housing part (1) is produced, in particular by means of a cable gland, by removing, in particular knocking out, a knockout area from the housing part (1) manufactured as a casting, wherein a connection device (17) is screwed to the housing part (1), wherein the connection device (17) is at least partially enclosed by the terminal box lower part in a housing-forming manner.

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