Elevator system, method for producing an elevator system

Abstract

The invention relates to an elevator system, comprising an elevator shaft, a elevator car and at least one counterweight which are arranged in the elevator shaft and are coupled to one another by means of a carrying means; at least one elevator drive; wherein the at least one carrying means extends over the elevator drive such that the carrying means can be moved by means of the elevator drive such that the elevator car and the at least one counterweight can be vertically displaced by operating the elevator drive. The elevator system further comprises a brake by means of which the elevator car and / or the counterweight can be braked and / or stopped.

Description

[0001] Elevator system, method for producing an elevator system

[0002] The present invention relates to an elevator installation with at least one elevator drive.

[0003] Elevator systems are used in many applications in buildings and factories for the transport of goods or people. Such elevator systems must be reliable and durable. To reduce installation and maintenance time and costs, it is advantageous for the elevator system components to be as light and compact as possible, or to not exceed a certain weight / size.

[0004] Known elevator systems for transporting people or loads comprise an elevator car that can be moved vertically in an elevator shaft. The elevator car is typically connected to a counterweight via a suspension element. A drive for moving the elevator car along a guide rail can be arranged, for example, on a drive structure in the headroom of the elevator shaft or in a machine room above the elevator shaft.

[0005] Elevator systems have an elevator drive, which basically has a stator, a rotor, a series of mechanical components that hold the stator and rotor together, and a cooling system. The stator generally has metal sheets stacked on top of one another, which can be connected to one another by lamination. In addition, the stator can have slot-shaped winding receptacles into which a stator winding can be inserted. The stator winding can be designed, for example, as an AC winding. Similar to the stator, the rotor can have a plurality of metal sheets, in particular iron sheets, stacked on top of one another, which can also be connected to one another by lamination. Alternatively, the rotor can be designed as a solid, in other words one-piece, component, i.e. as a non-laminated rotor.The rotor can be equipped with either an AC or DC winding, or with permanent magnets and / or specific flux barriers (reluctance machines). The mechanical components can be a mechanical structure that holds the stator and rotor together and enables the rotor to rotate around a rotational axis of the elevator drive.

[0006] The cooling system dissipates thermal losses in the form of heat generated during operation of the elevator drive, keeping the aforementioned components within the permissible temperature limits. These limits may depend on the materials used for these components and their properties and / or be specified by specific standards or operating limits.

[0007] The most commonly used design for elevator drives requires an external frame, in other words a housing, to accommodate the stator and rotor and to ensure the required rigidity and general IP protection. In these cases, the frame can consist of several supports connected to the stator via special mechanical interfaces. In these cases, a special heat exchanger can be installed, through which heat exchange takes place between the internal and external coolants of the elevator drive.

[0008] In smaller, more compact elevator drives, the frame may consist of a steel cylinder with multiple cooling fins on its exterior. In this case, a tight fit between the stator and the frame can ensure that the thermal losses generated by the elevator drive can be dissipated into the environment. The cooling fins increase the surface area for heat exchange and thus improve the cooling effect. Heat transfer from the frame to the environment of the elevator drive, in particular to the air surrounding the elevator drive, can occur either by forced ventilation, in particular using one or more fans that direct the airflow to the cooling fins, or by natural convection.

[0009] For more compact elevator drives, particularly those that are short in the direction of the rotation axis, other, simplified designs can be used, in particular the so-called frameless designs, in particular frameless stators. These designs do not require a special housing surrounding the stator, thereby reducing overall costs. In applications where the total length of the stator and rotor in the direction of the rotation axis is limited, for example, to less than 1 m, such a frameless stator can be attached to a base with several screws, whereby the screws can be inserted into support structures on an outer surface of the frameless stator. A second base is also often provided, on which bearings that rotatably support the rotor are arranged. However, cooling can be inadequate with these frameless stators because the housing with the corresponding cooling devices is missing.

[0010] Elevator systems require relatively high drive torque over a wide speed range. Therefore, frameless stators regularly require auxiliary fans to ensure the necessary cooling of the elevator drive at all operating speeds. These auxiliary fans are operated by appropriate control circuits and their own small electric motors, powered by external energy sources.

[0011] Both the housing and the auxiliary fans contribute to the complex structure of conventional elevator drives. This can lead to relatively high manufacturing costs and relatively time-consuming and / or costly maintenance work for the elevator drive, especially compared to less complex elevator drives without a housing or auxiliary fans. When auxiliary fans are used, the energy consumption of the elevator drive can be relatively high, which can negatively impact the sustainability of the elevator drive and lead to relatively high operating costs compared to an elevator drive without an auxiliary fan.

[0012] Thus, there may be a need for an improved elevator system. In particular, there may be a need for an elevator system with an elevator drive having a frameless stator that is simple in design, inexpensive to manufacture and / or operate, and / or easy to maintain. Furthermore, there may be a need for a method for manufacturing such an elevator system that is simple and / or inexpensive to implement.

[0013] Such a need can be met by the subject matter of one of the independent claims. Advantageous embodiments are defined in the dependent claims and in the following description and the accompanying figures. A first aspect of the invention relates to an elevator system. The invention comprises an elevator system comprising:

[0014] - an elevator shaft;

[0015] - a car arranged in the elevator shaft; - at least one counterweight arranged in the elevator shaft and coupled to the car via at least one support means; at least one elevator drive; wherein the at least one support means extends over the elevator drive such that the support means is movable by means of the elevator drive, so that the car and the at least one counterweight can be displaced vertically by operating the elevator drive; and

[0016] - a brake by means of which the car and / or the counterweight can be slowed down and / or locked.

[0017] According to one embodiment, the elevator drive comprises a housingless stator. The housingless stator comprises a stator core having a stator recess for accommodating a rotor of the elevator drive, and one or more cooling fins arranged on an outer surface of the stator core. In a further aspect, the present disclosure relates to an elevator drive according to the configuration described above and / or below.

[0018] The frameless stator can also be referred to as a "frameless stator." The frameless stator means that the stator is not arranged in a stator housing or the housing of the elevator drive, which in turn is arranged on a corresponding base, but rather that the stator is arranged directly on the corresponding base and / or that the elevator drive does not have a housing, in particular a stator housing. Accordingly, the stator is preferably designed for direct mounting on a support structure, in particular a base, and makes direct contact with the support structure when mounted.

[0019] The cooling fins are designed to dissipate heat into a gaseous cooling medium that directly contacts the stator and, in particular, the cooling fins. The gaseous cooling medium can be air, in particular the ambient air surrounding the elevator drive. A flow channel is formed in the space between each two adjacent cooling fins, through which the gaseous cooling medium can flow.

[0020] The stator core can, for example, have or consist of several metal layers, in particular metal sheets, for example iron sheets. The metal layers can each have a thickness in a range, for example, from 0.1 mm to 1 cm, for example from 0.3 mm to 0.65 mm. The metal layers can be separated from one another by dielectric layers in order to minimize eddy current losses induced by the alternating magnetic current. In the case of metal sheets, this can be achieved by applying an insulating varnish to both sides of the metal sheets. The metal layers each have a layer recess in the corresponding metal layer, wherein the layer recesses together form the stator recess for receiving the rotor. On a wall of the jointly formed recess, several winding receptacles, for example in the form of slots, for receiving one or more stator windings can be formed.In this context, the elevator drive, in particular the stator, can have the stator winding(s). The stator windings can also be referred to as coils and / or comprise copper, in particular be formed from insulated copper wires.

[0021] For example, the end faces of the cooling fins that are farther away from the stator core can each be at least 10 mm away from the stator core in the radial direction. Illustratively speaking, the cooling fins can each have a height of at least 10 mm. For example, the far end faces of the cooling fins can each be between 10 mm and 100 mm, for example between 15 mm and 70 mm, for example between 20 mm and 50 mm away from the rest of the stator core. This helps ensure sufficient cooling by means of the cooling fins. The end faces of the cooling fins form at least partially the outer contour or circumferential contour of the stator.

[0022] The elevator drive can be an electric motor or a generator, or can be operated in both motor and generator mode. The elevator drive can have a rotating shaft, for example a motor shaft or a generator shaft, that rotates about the axis of rotation. The rotor can be connected to the rotating shaft in a rotationally fixed manner. The rotating shaft, the rotor, and / or the stator can be arranged concentrically to the axis of rotation. Furthermore, the rotor can have one or more windings, for example copper windings, in particular one or more rotor winding(s). These windings can be arranged and / or fastened in corresponding winding receptacles of the rotor.

[0023] A large portion of the elevator drive's energy losses occur in the form of thermal losses, particularly heat. These thermal losses arise largely in the stator, particularly in the stator core formed by the metal layers and in the stator windings mounted in the winding receptacles. The stator with its cooling fins ensures that the heat is dissipated precisely where it is generated, making cooling very efficient. This type of cooling is also largely independent of the elevator drive's current speed. Therefore, sufficient cooling of the elevator drive is guaranteed even at low speeds or when stationary.An orientation of the cooling fins can be adapted to a convection that otherwise occurs in the elevator drive and / or the environment of the elevator drive in order to create a particularly good air flow around the cooling fins and thus a particularly efficient cooling of the stator and thus of the elevator drive.

[0024] The elevator drive's stator with cooling fins eliminates the need for auxiliary fans. This simplifies the design of the elevator drive, thus reducing overall costs compared to an elevator drive with an auxiliary fan. This keeps energy consumption low over the entire service life of the elevator drive, promoting the overall sustainability of the elevator drive. Furthermore, the complexity of the elevator drive with the frameless stator featuring cooling fins is relatively low compared to an elevator drive with an auxiliary fan and / or a housing, particularly a stator housing. Due to this relatively low complexity, the elevator drive's reliability can be high, resulting in a low number of operational failures of the elevator drive.

[0025] In elevator machines with a horizontal axis of rotation, the use of a frameless stator, which implies the absence of a housing, in most cases requires a limited axial length for the stator core, for example, an iron core, of the stator, so that the stator can be suspended on only one side from a vertical support structure, such as a pedestal, without adversely affecting overall mechanical stability, induced vibrations, and / or noise generated during operation of the elevator machine. Generally, this is achieved when the stator length is limited to 1 m or less. However, the present invention can also be considered for longer stators, even if these require a more complex mechanical structure to support the stator core, for example, two pedestals to which the stator core is attached on both axial sides of the stator.These designs can be used, for example, for various passenger transport systems, such as elevators, escalators, or walkways. However, the elevator drive with the frameless stator and cooling fins can also be used for applications where the elevator drive's rotation axis is vertically aligned.

[0026] According to one embodiment, the cooling fins are arranged directly on the stator core. This contributes to a particularly good and effective thermal coupling between the stator core and the cooling fins, and thus to particularly efficient cooling of the stator and thus of the elevator drive. The fact that the cooling fins are arranged "immediately," or in other words "directly," on the stator core means, for example, that there is no other body between the cooling fins and the stator core and / or that the cooling fins are formed integrally with the stator core or at least integrally with one or more parts of the stator core.

[0027] According to one embodiment, the stator recess is rotationally symmetrical to the axis of rotation of the elevator drive, and the cooling fins are designed and / or arranged such that they extend perpendicular to the axis of rotation. The cooling fins can extend, for example, in the circumferential direction of the stator. Alternatively, the cooling fins can extend in the axial direction or in a direction between the circumferential direction and the axial direction, depending on which embodiment provides a stronger air flow around the cooling fins in the vicinity of the elevator drive. Alternatively, the cooling fins can be arranged parallel to one another. According to one embodiment, the stator core, or at least parts of the stator core, and the cooling fins are formed as a single piece. In other words, the stator core, or at least parts of the stator core, and the cooling fins can be formed from one piece.This contributes to a particularly good and effective thermal coupling of the stator core to the cooling fins and thus to a particularly efficient cooling of the stator and thus of the elevator drive.

[0028] According to one embodiment, the stator has a plurality of metal layers that together form the stator core and the cooling fins. The metal layers each have a layer recess. The metal layers are arranged alternately one behind the other in the direction of the rotation axis such that the layer recesses are congruent with one another and together form the stator recess. At least every second of the metal layers has, at least in some regions, a larger outer diameter than the corresponding adjacent metal layers. The regions in which the metal layers have the larger outer diameter than the corresponding adjacent metal layers form the cooling fins. This makes it easy to form at least parts of the stator core, in particular the second metal layers, in one piece with the cooling fins. This contributes to particularly efficient heat dissipation from the stator core to the cooling fins.The metal layers can be part of the stator core. At least every second metal layer forms the cooling fins and is thus formed integrally with them. Thus, in this embodiment, the cooling fins are formed integrally with the stator core, in particular integrally with parts of the stator core.

[0029] In one embodiment, the cooling fins extend continuously or substantially continuously in the circumferential direction relative to the rotational axis. Furthermore, in one embodiment, a flow channel formed between each two adjacent cooling fins extends continuously or substantially continuously in the circumferential direction relative to the rotational axis. This can be achieved by the first metal fins having a larger metal layer over their entire circumference or substantially over their entire circumference than the second metal layers forming the cooling fins. "Substantially" can mean, for example, at least 95%, at least 90%, or at least 80%. Optionally, the metal layers can each have a plurality of continuous fastening recesses, which are designed and arranged such that they are arranged congruently one behind the other when the metal layers are arranged adjacent to one another.If necessary, a fastening element, such as a screw or a pin, can be passed through each of the fastening recesses, for example, to fasten the stator to the base. In the areas where the fastening recesses are formed, the first and second metal layers can have the same outer diameter. The areas where the second metal layers have a larger outer diameter than the first metal layers and which form the cooling fins can then be arranged circumferentially between the fastening recesses.

[0030] The regions in which the first and second metal layers have the same diameter can, for example, amount to at most 5%, at most 10%, or at most 20% in the circumferential direction. In one embodiment, the first metal layers have an upper diameter in the region of the fastening recesses and a lower diameter elsewhere. The upper diameter can be the same as the diameter of the second metal layers. A continuous transition or a step can be formed between the regions of the upper and lower diameters.

[0031] According to one embodiment, the metal layers are arranged directly adjacent to one another. In other words, there may be no other components of the elevator drive between the metal layers, particularly in the axial direction of the rotation axis. This can contribute to particularly good coupling between the metal layers. Alternatively, the aforementioned dielectric layers, particularly the insulating varnish, can be arranged between the metal layers.

[0032] According to one embodiment, the metal layers each comprise or are formed from a plurality of metal segments. Thus, the metal layers can each be composed of a plurality of metal segments. This can contribute to generating particularly little waste during production, particularly during cutting, punching, or sawing of the metal layers. This can contribute to keeping manufacturing costs for the metal layers, and thus the stator and thus the elevator drive, particularly low.

[0033] According to one embodiment, the metal segments of one of the metal layers are arranged offset in the circumferential direction relative to the metal segments of an adjacent one of the corresponding metal layers such that interfaces between the metal segments of one of the metal layers are offset relative to interfaces between the metal segments of the corresponding adjacent metal layer or metal layers. In other words, the metal segments can be arranged such that the interfaces between the metal segments of one of the metal layers do not overlap the interfaces between the metal segments of the corresponding adjacent metal layers. This can help ensure that the finally assembled stator, in terms of its behavior, its function and / or its properties, is as close as possible to a stator whose stator core or whose metal layers are formed from a single piece and does not comprise multiple metal layers or metal layers.have several metal segments.

[0034] According to one embodiment, the metal layers comprise first metal layers and second metal layers arranged alternately. The second metal layers have, at least in some regions, a larger outer diameter than the first metal layers. The regions in which the second metal layers have a larger outer diameter than the first metal layers form the cooling fins. Thus, there can be at least two different types of metal layers, one type of these metal layers being the second metal layers, and the second metal layers forming the cooling fins, particularly in the regions in which the second metal layers have a larger outer diameter than the first metal layers. The second metal layers are parts of the stator core. The second metal layers form the cooling fins and are thus formed integrally therewith.Thus, in this embodiment, the cooling fins are formed integrally with the stator core, in particular integrally with parts of the stator core.

[0035] According to an embodiment with first and second metal layers, the first metal layers are configured identically or substantially identically to one another, and the second metal layers are configured identically or substantially identically to one another, with the first metal layers and the second metal layers being configured differently from one another. In particular, a circumferential contour of the first and second metal layers can be different in a top view or in a viewing direction parallel to the rotation axis.

[0036] First metal layers and second metal layers can be arranged in direct alternation or alternating fashion along the rotation axis, so that first metal layers and second metal layers follow one another directly. However, it is also possible in principle for groups of a number of first metal layers and second metal layers to be arranged in alternating fashion along the rotation axis, whereby the number of metal layers can be the same or different.

[0037] According to one embodiment, the metal layers are identical and each have regions with a first outer diameter and regions with a second outer diameter, wherein the second outer diameter is greater than the first outer diameter, and the metal layers are arranged on one another such that the regions with the first outer diameters of one of the metal layers are arranged in the direction of the axis of rotation next to regions with the second outer diameters of a corresponding adjacent one of the metal layers, wherein the cooling fins are formed by the regions with the second outer diameters.Thus, the stator core can be formed from several similar metal layers that have expanded outer diameters only in individual outer regions. These similar metal layers are then arranged offset from one another such that the regions with expanded outer diameters of one of the metal layers are each arranged axially adjacent to regions with non-expanded outer diameters of the corresponding adjacent metal layers. In this embodiment, too, the regions in which the metal layers have the larger outer diameter form the cooling fins. Furthermore, in this embodiment, the cooling fins are also formed integrally with parts of the stator core, in particular with the metal layers.

[0038] According to one embodiment, the rotor has a plurality of blades arranged between the rotational axis and an outer circumference of the rotor, and designed to move air toward the stator. The rotor with the blades can, in particular, be configured to act like a fan, moving the air outward toward the stator as the rotor rotates. This air can flow past the cooling fins and absorb heat from them. This can contribute to increasing the cooling efficiency of the cooling fins. The shape and orientation of the cooling fins can be coordinated so that the blades can achieve optimal airflow around the cooling fins.

[0039] A second aspect of the invention relates to a method for producing an elevator installation comprising an elevator drive with a housing-less stator, the method comprising: providing a plurality of the metal layers, each having one of the layer recesses; and arranging the metal layers one behind the other in the direction of the axis of rotation such that the layer recesses are congruent with one another and together form the stator recess for receiving the rotor of the elevator drive, wherein at least every second of the metal layers has, at least in some regions, the larger outer diameter than the corresponding adjacent one of the metal layers, wherein the regions in which the metal layers have the larger outer diameter than the corresponding adjacent metal layers form the cooling fins of the stator and the metal layers arranged adjacent to one another together form the stator core of the stator.

[0040] Features of the elevator installation according to an embodiment of the first aspect of the invention can also be features of the method according to an embodiment of the second aspect of the invention and vice versa.

[0041] According to one embodiment, the metal layers have first metal layers and second metal layers, which are arranged alternately when the metal layers are arranged one behind the other, the second metal layers have at least in some regions a larger outer diameter than the first metal layers, and the regions in which the second metal layers have the larger outer diameter than the first metal layers form the cooling fins.

[0042] According to one embodiment, the metal layers are identical and each have regions with a first outer diameter and regions with a second outer diameter, wherein the second outer diameter is larger than the first outer diameter, and the metal layers are arranged when arranging the metal layers one behind the other such that the regions with the first outer diameters of one of the metal layers are arranged in the direction of the axis of rotation next to regions with the second outer diameters of a corresponding adjacent one of the metal layers, wherein the cooling fins are formed by the regions with the second outer diameters.

[0043] The elevator drive is suitable for use in a passenger transport system, in particular for moving a passenger transport device of the passenger transport system. The passenger transport system can be, for example, an elevator system, an escalator, or a moving walkway. Accordingly, the passenger transport device can have a car of the elevator system, steps of the escalator, or movable metal segments of the moving walkway. For example, in the case of the elevator system, the car can be arranged vertically displaceably in an elevator shaft, and the elevator drive can be arranged and configured such that the car can be displaced vertically in the elevator shaft by means of the elevator drive, wherein the elevator drive is mechanically coupled to the car via at least one support means.

[0044] Embodiments of the invention are described below with reference to the accompanying drawings, wherein neither the drawings nor the description are to be construed as limiting the invention.

[0045] Fig. 1 shows a schematic side sectional view of an elevator system according to an embodiment of the invention.

[0046] Fig. 2 shows a schematic side sectional view of an elevator drive according to an embodiment of the invention.

[0047] Fig. 3 shows a perspective view of a stator for an elevator drive according to an embodiment of the invention. Fig. 4 shows a perspective view of a stator for an elevator drive according to an embodiment of the invention.

[0048] Fig. 5 shows a perspective detailed view of a stator according to an embodiment of the invention.

[0049] Fig. 6 shows a perspective view of a first metal segment of a first metal layer of the stator according to Figure 4.

[0050] Fig. 7 shows a perspective view of an embodiment of a second metal segment of a second metal layer of the stator according to Figure 4.

[0051] Fig. 8 shows a schematic side sectional view of an elevator drive according to an embodiment of the invention.

[0052] Fig. 9 shows a flowchart of an embodiment of a method for producing a stator according to an embodiment of the invention.

[0053] Fig. 10 shows a flowchart of an embodiment of a method for producing a stator according to an embodiment of the invention.

[0054] The figures are merely schematic and not to scale. The same reference numerals designate identical or equivalent features in the various figures.

[0055] Fig. 1 shows a schematic side sectional view of a passenger transport system, for example, an elevator system 50, according to an embodiment of the invention. The elevator system 50 has a car 54, which is arranged vertically displaceably in an elevator shaft 52. The elevator system 50 has an elevator drive 20 of the type described above. The elevator drive 20 is arranged and designed such that the elevator car 54 can be displaced vertically in the elevator shaft 52 by means of the elevator drive 20, wherein the elevator drive 20 is mechanically coupled to the elevator car 54 via at least one support means 56, for example, a steel cable.

[0056] Fig. 2 shows a schematic side sectional view of an elevator drive 20 according to an embodiment of the invention. The elevator drive 20 is suitable, for example, for use in a passenger transport system, such as an elevator system (see Figure 8), an escalator, or a moving walkway. The elevator drive 20 has a rotor 24, which is rotatably mounted about a rotation axis 28 of the elevator drive 20, and a housing-free stator 22. The housing-free stator 22 has a stator core 31, in which the rotor 24 is rotatably arranged, and one or more cooling fins 30 arranged on an outer surface of the stator core 31. The stator 22, in particular the stator core 31, has a stator recess 29 for receiving the rotor 24.

[0057] The frameless stator 22 can also be referred to as a "frameless stator." The term "frameless stator" means that the stator 22 is not arranged in a stator housing or housing of the elevator drive 20, which in turn is arranged on a corresponding base (not shown), but rather that the stator 22 is arranged directly on the base and / or that the elevator drive 20 does not have a housing, in particular a stator housing.

[0058] The elevator drive 20 can be an electric motor or a generator, or can be operated in both motor mode and generator mode. The elevator drive 20 can have a rotating shaft 26, for example a motor shaft or a generator shaft, which rotates about the rotational axis 28. The rotor 24 can be connected to the rotating shaft 26 in a rotationally fixed manner. The rotating shaft 26, the rotor 24, and / or the stator 22 can be arranged concentrically to the rotational axis 28. Furthermore, the rotor 24 and / or the stator 22 can have one or more windings (not shown), for example copper windings, in particular one or more rotor windings or one or more stator windings.

[0059] The cooling fins 30 can be arranged directly on the stator core 31. The fact that the cooling fins 30 can be arranged "directly," in other words "immediately," on the stator core 31 means, for example, that there may be no other body between the cooling fins 30 and the stator core 31 and / or that the cooling fins 30 are formed integrally with the stator core 31 or at least integrally with one or more parts of the stator core 31, as explained in more detail below.

[0060] The cooling fins 30 can be designed and / or arranged such that they extend perpendicular to the rotational axis 28. The cooling fins 30 can extend, for example, in the circumferential direction of the stator 31. Alternatively, the cooling fins can extend in the axial direction, depending on the embodiment in which a stronger air flow around the cooling fins 30 is provided in the vicinity of the elevator drive 20. Furthermore, the cooling fins 30 can be arranged parallel to one another. Both the orientation of the cooling fins 30 and the spacing between the cooling fins 30 can be selected such that natural convection is utilized to ensure optimal air flow around the cooling fins 30.

[0061] End faces of the cooling fins 30 remote from the stator core 31 can each be at least 10 mm away from the stator core 31 in the radial direction, i.e., in the direction perpendicular to the rotation axis 28. Illustratively speaking, the cooling fins 30 can each have a height of at least 10 mm. For example, the remote end faces of the cooling fins 30 can each be between 10 mm and 100 mm, for example between 15 mm and 70 mm, for example between 20 mm and 50 mm, from the stator core 31. In this context, an outer diameter of the stator 22 can be in a range, for example, from 100 mm to 500 mm, for example approximately 200 mm.

[0062] Fig. 3 shows a perspective view of a stator 22 for an elevator drive 20, according to an embodiment of the invention, for example for the elevator drive 20 explained with reference to Figure 1. The stator 22 has the cooling fins 30 on its outer surface. In this embodiment, the stator core 31 can be formed in one piece. In other words, this stator core 31 can be solid. Alternatively, the stator core 31 can be formed from metal rings arranged one inside the other, wherein the innermost metal ring forms the stator recess 29 and the outermost metal ring is coupled to the cooling fins 30. The cooling fins 30 can be formed as explained with reference to Figure 1. In particular, the cooling fins 30 can be formed in one piece with the stator core 31 and / or extend in the circumferential direction of the stator 22.For example, the stator core 31 or, if applicable, the outermost metal ring of the stator core 31 can be cast such that the corresponding cast body also includes the cooling fins 30. In other words, the stator core 31 and the cooling fins 30 can be formed from a single piece. Alternatively, the cooling fins 30 can be attached directly to the stator core 31.

[0063] In the circumferential direction, a plurality of fastening recesses can be formed between the cooling fins 30, through which fastening means 32 for fastening the stator 30 to the base can be guided.

[0064] On a wall of the stator recess 29, a plurality of winding receptacles 38 (referenced in Figure 4), for example in the form of slots, can be formed for accommodating one or more stator windings (not shown). In this context, the elevator drive 20, in particular the stator 22, can have the stator winding(s). The stator windings can also be referred to as coils and / or comprise copper, in particular be formed from insulated copper wires.

[0065] Fig. 4 shows a perspective view of a stator 22 for an elevator drive 20, according to an embodiment of the invention, for example for the elevator drive 20 explained with reference to Figure 1.

[0066] The stator core 31 can, for example, be formed from a plurality of metal layers 36, in particular metal sheets, for example iron sheets. The metal layers 36 can each have a thickness in a range, for example, from 0.1 mm to 1 cm, for example from 0.3 mm to 0.65 mm. The metal layers 36 can be separated from one another by dielectric layers (not shown) in order to minimize eddy current losses induced by the alternating magnetic current. In the case of metal sheets, this can be achieved by an insulating varnish applied to both sides of the metal sheets. Alternatively, the metal layers 36 can be arranged directly next to one another. The metal layers 36 each have a layer recess of the corresponding metal layer 36, wherein the layer recesses together form the stator recess 29.

[0067] The metal layers 36 can each have a plurality of continuous fastening recesses 34, which are designed and arranged such that they are arranged congruently one behind the other when the metal layers 36 are arranged adjacent to one another. If necessary, one of the fastening means 34, for example a screw or a pin, can be guided through the fastening recesses 34, for example to fasten the stator 22 to the base.

[0068] The metal layers 36 can be of similar design. The similar metal layers 36 can each have an enlarged outer diameter in individual outer regions. These similar metal layers 36 can be arranged offset from one another such that the regions with enlarged outer diameters of one of the similar metal layers 36 are each arranged in the axial direction next to regions with non-enlarged outer diameters of the corresponding adjacent similar metal layer 36. In the regions in which the fastening recesses 34 are formed, the metal layers 36 can have the same outer diameter. In the circumferential direction between these regions, the metal layers 36 can have the larger outer diameter and form the cooling fins 30 there. Furthermore, in this embodiment, the cooling fins 30 are formed integrally with parts of the stator core 31, in particular with the metal layers 36.

[0069] Fig. 5 shows a perspective detailed view of a stator 22 according to an embodiment of the invention. The stator 22 has the metal layers, referred to below as second metal layers 36, and first metal layers 44, which together form the stator core 31 and the cooling fins 30. The first metal layers 44 can have a first layer recess for receiving the rotor 24. The second metal layers 36 can each have a second layer recess for receiving the rotor 24. The size and shape of the second layer recesses can correspond to a size and shape of the first layer recesses. The second metal layers 36 have, at least in some regions, a larger outer diameter than the first metal layers 44.The first and second metal layers 44, 36 can be arranged alternately one behind the other in the direction of the rotation axis 28 such that the layer recesses are congruent with one another and that the regions in which the second metal layers 36 have a larger outer diameter than the first metal layers 44 form the cooling fins 30. The congruently arranged layer recesses together form the stator recess 29, in which the rotor 24 can be rotatably mounted.

[0070] The second metal layers 36 are parts of the stator 22. The second metal layers 36 form the cooling fins 30 and are thus formed integrally therewith. Thus, in this exemplary embodiment, the cooling fins 30 are formed integrally with the stator core 31, in particular integrally with parts of the stator core 31, in particular the second metal layers 36.

[0071] Optionally, the first and second metal layers 44, 36 are each arranged directly adjacent to one another. In other words, no other components of the elevator drive 20 may be located between the first and second metal layers 44, 36, particularly in the axial direction of the rotational axis 28. Alternatively, the dielectric layers mentioned above, particularly the insulating varnish, may be arranged between the metal layers 44, 36.

[0072] Optionally, the first metal layers 44 can each be composed of a plurality of first metal segments 40, in particular in the circumferential direction, and / or the second metal layers 36 can each be composed of a plurality of second metal segments 42, in particular in the circumferential direction. For example, the first metal segments 40 can be arranged offset from the second metal segments 42 in the circumferential direction such that interfaces between the first metal segments 40 are offset from interfaces between the second metal segments 42. In other words, the metal segments 40, 42 can be arranged such that the interfaces between the first metal segments 40 do not overlap the interfaces between the second metal segments 42. Fig. 6 shows a perspective view of an embodiment of one of the first metal segments 40 of one of the first metal layers 44 of the stator 22 according to Figure 4.In particular, the first metal layers 36 can each comprise or be formed from a plurality of these first metal segments 40. The first metal segments 40 can comprise the winding receptacles 38 for receiving the stator winding.

[0073] Fig. 7 shows a perspective view of an exemplary embodiment of one of the second metal segments 42 of one of the second metal layers 44 of the stator 22 according to Fig. 4. In particular, the second metal layers 44 can each comprise or be formed from a plurality of the second metal segments 42. The second metal segments 42 can comprise the winding receptacles 38 for receiving the stator winding.

[0074] Fig. 8 shows a schematic side sectional view of an elevator drive 20 according to an embodiment of the invention. The elevator drive 20 can, for example, largely correspond to the elevator drive 20 explained with reference to Figure 1 and / or have one of the stators 22 explained with reference to Figures 2, 3, or 4. Therefore, only those features of the elevator drive 20 shown in Figure 7 in which the elevator drive 20 differs from the elevator drive 20 explained with reference to Figure 1 will be explained below.

[0075] The rotor 24 can have a plurality of vanes 46 arranged between the rotational axis 28 and an outer circumference of the rotor 24, and which are designed to move air from the surroundings of the elevator drive 20 toward the stator 22, in particular toward the cooling fins 30, upon rotation of the rotor 24. The rotor 24 with the vanes 46 can, in particular, be configured to act like a fan, which, upon rotation of the rotor 24, moves the air outward toward the stator 22 or the cooling fins 30.

[0076] Furthermore, in this embodiment, the cooling fins 30 are formed parallel to the rotational axis 28. Alternatively, the cooling fins 30 can be formed perpendicular to the rotational axis 28 and in the circumferential direction, as shown in Figure 2. Furthermore, the cooling fins 30 can also be formed obliquely, i.e., in terms of their orientation, between the orientation shown in Figure 1 and the orientation shown in Figure 8. Fig. 9 shows a flowchart of an embodiment of a method for

[0077] Manufacturing a stator 22, for example the stator 22 according to Figure 3.

[0078] In an optional step S2, the similar metal layers 36 can be provided by forming and assembling corresponding metal segments, which together form the corresponding metal layer 36. The metal segments can, for example, be punched, milled, sawn, or cut out of corresponding metal sheets.

[0079] In a step S4, the identical metal layers 36 can be provided. The identical metal layers 36 can each have regions with a first outer diameter and regions with a second outer diameter, wherein the second outer diameter is larger than the first outer diameter. The identical metal layers 36 can, for example, be punched, milled, sawn, or cut out from corresponding metal sheets. In this case, the identical metal layers 36 can each be formed in one piece. Alternatively, the identical metal layers 36 can be provided by means of step S2. The identical metal layers 36 can be formed such that they each have the layer recess for receiving the rotor 24.

[0080] In a step S6, the similar metal layers 36 can be arranged one behind the other in the direction of the rotation axis 28 such that their layer recesses are congruent with one another and such that the regions with the first outer diameters of one of the similar metal layers 36 are arranged in the direction of the rotation axis 28 next to regions with the second outer diameters of a corresponding adjacent one of the similar metal layers 36, wherein the cooling fins 30 are formed by the regions with the second outer diameters. The similar metal layers 36 arranged next to one another together form the stator core 31 and the cooling fins 30 of the stator 22. The similar metal layers 36 can be arranged directly next to one another.If the similar metal layers 36 are composed of the corresponding metal segments, the similar metal layers 36 can be arranged to one another such that the metal segments are arranged offset in the circumferential direction relative to the metal segments of adjacent metal layers 36 such that the interfaces between the metal segments are offset relative to the interfaces between the metal segments of the adjacent metal layers 36.

[0081] Finally, if necessary, the stator windings can be attached to the stator 22, in particular in the winding receptacles 38.

[0082] Fig. 10 shows a flowchart of an embodiment of a method for producing a stator 22, for example the stator 22 according to Figure 4.

[0083] In an optional step S8, the first metal layers 44 can be provided by forming and assembling the plurality of first metal segments 40, which together form the corresponding first metal layer 44. The metal segments 40 can, for example, be punched, milled, sawn, or cut out of corresponding metal sheets. Step S2 can be performed in particular when the first metal layers 44 are assembled from the first metal segments 40.

[0084] In a step S10, a plurality of the first metal layers 44 can be provided. The first metal layers 44 can, for example, be punched, milled, sawn, or cut out from corresponding metal sheets. In this case, the first metal layers 44 can each be formed integrally. Alternatively, the first metal layers 44 can be provided by means of step S2. The first metal layers 44 can be formed such that they each have the first layer recess for receiving the rotor 24.

[0085] In an optional step S12, the second metal layers 36 can be provided by forming and assembling the plurality of second metal segments 42, which together form the corresponding second metal layer 36. The second metal segments 42 can, for example, be punched, milled, sawn, or cut out of corresponding metal sheets. Step S12 can be performed in particular when the second metal layers 36 are assembled from the second metal segments 42.

[0086] In a step S14, a plurality of second metal layers 36 can be provided. The second metal layers 36 can, for example, be punched, milled, sawn, or cut out from corresponding metal sheets. In this case, the second metal layers 36 can each be formed in one piece. Alternatively, the second metal layers 36 can be provided by means of step S6. The second metal layers 36 can be formed such that they each have the second layer recess for receiving the rotor 24. The second metal layers 36 can each have the second layer recess for receiving the rotor 24, the size and shape of which corresponds to the size and shape of the first layer recesses. The second metal layers 36 can be formed such that they have a larger outer diameter than the first metal layers 44, at least in some regions.

[0087] In a step S16, the first and second metal layers 44, 36 can be arranged alternately one behind the other in the direction of the rotation axis 28 such that their layer recesses are congruent with one another, wherein the regions in which the second metal layers 36 have a larger outer diameter than the first metal layers 44 form the cooling fins 30. The first and second metal layers 44, 36 arranged adjacent to one another jointly form the stator core 31 and the cooling fins 30 of the stator 22. The first and second metal layers 44, 36 can be arranged directly adjacent to one another.

[0088] If the metal layers 44, 36 are composed of the corresponding metal segments 40, 42, the metal layers 44, 36 can be arranged relative to one another such that the first metal segments 40 are offset in the circumferential direction relative to the second metal segments 42 such that the interfaces between the first metal segments 40 are offset relative to the interfaces between the second metal segments 42.

[0089] Finally, if necessary, the stator windings can be attached to the stator 22, in particular in the winding receptacles 38. Finally, it should be noted that terms such as "having," "comprising," etc., do not exclude other elements or steps, and terms such as "a" or "an" do not exclude a plurality. Furthermore, it should be noted that features or steps described with reference to one of the above embodiments can also be used in combination with other features or steps of other of the above embodiments. Reference symbols in the claims are not to be considered as limitations.

Claims

Patent claims 1. Lift system (50) comprising: - a lift shaft (52); - a car (54) arranged in the elevator shaft (52); - at least one counterweight arranged in the elevator shaft (52) and coupled to the elevator car (54) via at least one support means (56); at least one elevator drive (20); wherein the at least one support means (56) extends over the elevator drive (20) such that the support means (56) is movable by means of the elevator drive (20), so that the elevator car (54) and the at least one counterweight can be displaced vertically by operating the elevator drive (20); and - a brake by means of which the car (54) and / or the counterweight can be braked and / or locked.

2. Elevator installation (50) according to claim 1, wherein the elevator drive (20) comprises a housing-less stator (22), the housing-less stator (22) comprising: a stator core (31) having a stator recess (29) for receiving a rotor (24) of the elevator drive (20), and one or more cooling fins (30) arranged on an outer surface of the stator core (31).

3. Elevator installation (50) according to claim 2, wherein the cooling fins (30) are arranged directly on the stator core (31).

4. Elevator installation (50) according to one of claims 2 or 3, wherein the stator recess (29) is rotationally symmetrical to a rotational axis (28) of the elevator drive (20), and the cooling fins (30) are designed and / or arranged such that they extend perpendicular to the rotational axis (28).

5. Elevator installation (50) according to one of claims 2 to 4, wherein the stator core (31) or at least parts of the stator core (31) and the cooling fins (30) are formed in one piece.

6. Elevator installation (50) according to one of claims 2 to 5, wherein the stator (22) has a plurality of metal layers (44, 36) which together form the stator core (31) and the cooling fins (30), the metal layers (44, 36) each have a layer recess, the metal layers (44, 36) are arranged alternately one behind the other in the direction of the axis of rotation (28) such that the layer recesses are congruent with one another and together form the stator recess (29), at least every second of the metal layers (44, 36) has, at least in some regions, a larger outer diameter than a corresponding adjacent one of the metal layers (44, 36), and the regions in which the metal layers (44, 36) have the larger outer diameter than the corresponding adjacent metal layers (44, 36) form the cooling fins (30).

7. Elevator installation (50) according to claim 6, wherein the metal layers (44, 36) are each arranged directly adjacent to one another.

8. Elevator installation (50) according to one of claims 6 or 7, wherein the metal layers (44, 36) each comprise or are formed from a plurality of metal segments (40, 42).

9. Elevator installation (50) according to claim 8, wherein the metal segments (40, 42) of one of the metal layers (44, 36) are arranged offset in the circumferential direction to the metal segments (40, 42) of an adjacent one of the corresponding metal layers (44, 36) such that interfaces between the metal segments (40, 42) of one of the metal layers (44, 36) are offset to interfaces between the metal segments (40, 42) of the corresponding adjacent metal layer (44, 36).

10. Elevator installation (50) according to one of claims 6 to 9, wherein the metal layers (44, 36) have first metal layers (44) and second metal layers (36) which are arranged alternately, the second metal layers (36) have at least in some regions a larger outer diameter than the first metal layers (44), and the regions in which the second metal layers (36) have the larger outer diameter than the first metal layers (44) form the cooling fins (30).

11. Elevator installation (50) according to one of claims 6 to 10, wherein the metal layers (44, 36) are identically formed and each have regions with a first outer diameter and regions with a second outer diameter, wherein the second outer diameter is greater than the first outer diameter, and the metal layers (44, 36) are arranged on one another such that the regions with the first outer diameters of one of the metal layers (44, 36) are arranged in the direction of the axis of rotation (28) next to regions with the second outer diameters of a corresponding adjacent one of the metal layers (44, 36), wherein the cooling fins (30) are formed by the regions with the second outer diameters.

12. Elevator installation (50) according to one of claims 6 to 11, wherein the first metal layers (36) are designed to be identical or substantially identical to one another and wherein the second metal layers (44) are designed to be identical or substantially identical to one another, wherein the first metal layers (36) are designed differently from the second metal layers.

13. Elevator installation (50) according to claim 12, wherein an outer contour of the first metal layers (36) and an outer contour of the second metal layers (44) are different in a viewing direction parallel to the axis of rotation (28).

14. Elevator installation (50) according to one of claims 2 to 13, wherein the cooling fins (30) are designed to dissipate heat to a gaseous cooling medium directly contacting the stator (22), wherein the gaseous cooling medium is in particular air.

15. Elevator installation (50) according to one of claims 2 to 14, wherein the cooling fins (30) are continuously circumferential or substantially continuously circumferential in the circumferential direction relative to the axis of rotation (28).

16. Elevator installation (50) according to one of the preceding claims, further comprising: a rotor (24) which is rotatably mounted about a rotational axis (28) of the elevator drive (20); and wherein the rotor (24) is rotatably arranged in a stator recess (29) of the stator (22).

17. Elevator installation (50) according to claim 16, wherein the rotor (24) has a plurality of vanes (46) which are arranged between the axis of rotation (28) and an outer circumference of the rotor (24) and which are designed to move air towards the stator (22).

18. Method for producing an elevator installation (50), in particular an elevator installation according to one of the preceding claims, and its elevator drive (20), the method comprising: Providing a plurality of metal layers (44, 36), each having a layer recess; and Arranging the metal layers (44, 36) one behind the other in such a way that the layer recesses are congruent with one another and together form a stator recess (29) for receiving a rotor (24) of the elevator drive (20), wherein at least every second of the metal layers (44, 36) has, at least in some regions, a larger outer diameter than a corresponding adjacent one of the metal layers (44, 36), wherein the regions in which the metal layers (44, 36) have the larger outer diameter than the corresponding adjacent metal layers (44, 36), form cooling fins (30) of the stator (22) and the metal layers (44, 36) arranged on top of one another together form a stator core (31) of the stator (22).

19. The method according to claim 18, wherein the metal layers (44, 36) comprise first metal layers (44) and second metal layers (36), which are arranged alternately when the metal layers (44, 36) are arranged one behind the other, the second metal layers (36) have at least in some regions a larger outer diameter than the first metal layers (44), and the regions in which the second metal layers (36) have the larger outer diameter than the first metal layers (44) form the cooling fins (30) and / or wherein the metal layers (44, 36) are formed identically and each have regions with a first outer diameter and regions with a second outer diameter, wherein the second outer diameter is larger than the first outer diameter, and the metal layers (44, 36) are arranged one behind the other in such a way that the regions with the first outer diameters of one of the metal layers (44,36) are arranged in the direction of the rotation axis (28) next to regions with the second outer diameters of a corresponding adjacent one of the metal layers (44, 36), wherein the cooling fins (30) are formed by the regions with the second outer diameters.

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