Elevator with drive having cooling device

Abstract

The present invention relates to an elevator comprising: an elevator hoistway; a car and at least one counterweight arranged in the elevator hoistway and coupled to each other via at least one support means; and at least one elevator drive, wherein the elevator drive has a traction portion. The elevator drive (1) comprises a housing (2), a stator (3) arranged in the housing (2), a rotor (4) rotatably mounted in the stator (3), and an electronics unit (7), in which the housing (2) comprises a stator receiving portion (2a) and a separately formed electronics receiving portion (2b) in which the electronics unit (7) is arranged, wherein the electronics accommodating part (2b) is fastened to the stator accommodating part (2a), the electronics accommodating part (2b) has an inner wall (14) and an outer wall (12), the inner wall (14) and the outer wall (12) are connected to each other and form an intermediate space, the electronics unit (7) is arranged in the intermediate space, the electronics unit (7) comprises a printed circuit board (8) and an electronic circuit component (32) mounted on the printed circuit board (8), wherein the electronic circuit component (32) comprises a power transistor (33), and wherein an outer wall (12) of the electronics housing portion (2b) has heat dissipation fins (24) protruding from at least one bottom wall portion (12a, 12b) of the outer wall (12), and wherein the outer wall (12) has at least one or more heat dissipation paths (25) adjacent to or in contact with the electronics unit (7) at the location of the power transistor (33).

Description

Technical Field

[0001] The present invention relates to an elevator having at least one elevator drive. Background Technology

[0002] Elevators are used in many applications in buildings and factories for transporting goods or people. Such elevators must be reliable and durable. To reduce installation and maintenance time and costs, it is advantageous if elevator components are as light and small as possible, or do not exceed a certain weight / size. Such a weight is, for example, 30kg, because most countries allow a person to carry a weight of 30kg. Therefore, in most countries, a single person can carry elevator components weighing less than 30kg. This means that installation and maintenance do not require additional personnel.

[0003] Known elevator systems for transporting people or loads include an elevator car that can move vertically within an elevator shaft. The elevator car is typically connected to a counterweight via a support structure. The drive mechanism for moving the elevator car along guide rails can be located on a drive assembly in, for example, at the head (shaft opening) of the elevator shaft or in a machine room above the shaft. However, previously known drive systems for elevator systems require significant space, such as a large amount of space within the elevator shaft opening, or they are complex to install. Summary of the Invention

[0004] The object of this invention is to provide an elevator, and more particularly an elevator drive, which is an improvement over elevators known in the prior art, particularly by reducing the space requirements of the elevator drive or simplifying the installation of the elevator drive.

[0005] In this document, unless otherwise stated, the term "axial" refers to the direction along or parallel to the drive axis, corresponding to the axis of rotation of its rotor (specifically its rotor shaft). The direction perpendicular to the axial direction is referred to as "radial." Unless otherwise stated, directional terms such as "above," "below," "horizontal," and "vertical" generally refer to the downward direction of gravity and also relate to typical mounting positions where the drive rotor is horizontally aligned. In this case, the vertical direction is the radial direction. However, its use in other orientations is not excluded.

[0006] This objective is achieved by the elevator as described in the independent claim.

[0007] This invention includes an elevator, comprising: - Elevator shaft; - An elevator car, which is arranged in the elevator shaft; - At least one counterweight, which is arranged in the elevator shaft and coupled to the elevator car via at least one support device; - At least one elevator drive; wherein the elevator drive has a traction portion; Wherein, the at least one support device extends around the traction portion of the elevator drive, such that the support device can be moved by the elevator drive, so that the elevator car and the at least one counterweight can be vertically displaced by operating the elevator drive; and - A brake, particularly an elevator car brake, by which the elevator car and / or the counterweight can be braked and / or fixed.

[0008] In one embodiment, the elevator further includes a second counterweight disposed in the elevator shaft, a second elevator drive having a traction portion, and a second support device connected to the elevator car and the second counterweight, wherein the support device extends around the traction portion of the second elevator drive such that the support device can be moved by the second elevator drive, thereby enabling the elevator car and the second counterweight to be vertically displaced by operating the elevator drive.

[0009] By using two elevator drives, each individual elevator drive is lighter.

[0010] Since the elevators described above and below include two elevator drives, it is particularly advantageous to provide an elevator car brake.

[0011] Using two elevator drives to move the elevator car allows the load to be distributed across the two drives, so that each drive only needs to move half the load. This allows each individual elevator drive to be designed to be particularly small and / or lightweight. Such elevator drives are particularly easy to handle, especially by a single person. Furthermore, such elevator drives can be designed to be particularly compact, thus requiring very little space. This allows the elevator drives to be secured, for example, to the top slab (ceiling) of the elevator shaft. A separate space above the elevator shaft for accommodating the elevator drives is not necessary. In one embodiment, the weight of the elevator drive does not exceed 30 kg.

[0012] For example, the elevator can be a freight elevator or a passenger elevator. The two counterweights preferably have the same weight. The support devices may each have one, two, or more ropes and / or belts.

[0013] According to one embodiment of the elevator, the elevator drive is arranged in the elevator shaft in such a way that it is suspended from the top plate of the elevator shaft.

[0014] The area adjacent to the ceiling in an elevator shaft can also be referred to as the shaft head (shaft opening). Therefore, the elevator drive unit can be arranged to be suspended / supported within the shaft head. This eliminates the need for a separate space (especially a machine room) above the elevator shaft for arranging the elevator drive unit. This allows for the creation of the entire elevator in a particularly compact manner.

[0015] Optionally, the elevator may have a control device for controlling the elevator drives. The control device may have a processor configured to control the elevator drives such that they move corresponding support devices synchronously, and thus synchronously move the counterweight and the elevator car. The control device may include hardware and / or software modules. In addition to the processor, the control device may include memory and a data communication interface for data communication with peripheral devices.

[0016] According to the claim, the elevator drive includes a housing, a stator disposed within the housing, a rotor rotatably mounted around the stator, and an electronics unit. The housing includes a stator housing portion and a separately formed electronics housing portion, in which the electronics unit is disposed. The electronics housing portion is fastened to the stator housing portion. The electronics housing portion includes inner and outer walls connected to each other and an intermediate space therein where the electronics unit is disposed. The electronics unit includes a circuit board and electronic circuit components attached to the circuit board. The electronic circuit components include power transistors. The outer wall of the electronics housing portion has heat dissipation fins or cooling fins projecting from at least one bottom wall portion of the outer wall. The radial extension direction of the heat dissipation fins is generally the main extension direction of the heat dissipation fins.

[0017] In one embodiment, the radial extension direction of the heat dissipation fins is vertical or substantially vertical. In other words, the heat dissipation fins extend vertically or substantially vertically. This arrangement ensures particularly good heat dissipation because the air heated by the heat dissipation fins is easily exhausted upwards in the channels.

[0018] In one embodiment, the elevator drive is designed to passively, and particularly passively only, dissipate heat generated in the electronic device unit by means of heat dissipation fins. This means that cooling of the electronic device unit is passively achieved through convection cooling. In particular, the elevator drive advantageously does not include a fan or blower for cooling the electronic device unit.

[0019] In one embodiment, the rotor's axis of rotation is horizontal or substantially horizontal, or perpendicular or substantially perpendicular to gravity.

[0020] Furthermore, in one embodiment, the circuit board extends perpendicular to or substantially perpendicular to the rotor (especially the rotor shaft). In other words, the longitudinal axis of the rotor or rotor shaft is perpendicular to the circuit board.

[0021] According to the claim, the outer wall further includes at least one or more heat dissipation paths (heat dissipation cavities) located adjacent to or in contact with the electronic device unit at the position of the power transistor.

[0022] The advantage is that elevator drives can therefore be constructed to be particularly compact, i.e., with a high power-to-weight ratio. It also proves advantageous that, despite the compact design, cooling of electronic components (especially power transistors) is made possible in a relatively simple manner through heat dissipation paths formed within the housing. Space can be saved by combining the motor and electronics housing sections. The result is elevator drives that can meet temperature and power requirements even in small designs. The configuration of passive cooling by means of heat dissipation paths formed in the housing walls is a particularly easy and cost-effective way to design elevator drives with an increased power-to-weight ratio.

[0023] The increased torque and power-to-weight ratio of elevator drives results in their applicability to a wider range of applications and reduces the number of elevator drives required for specific elevator applications. Therefore, achieving a high power-to-weight ratio and thus keeping elevator installation and maintenance work (i.e., low cost) is advantageous. The reliability of elevator drives is generally critical, as drive failure compromises elevator safety and significantly impacts the costs associated with elevator repair.

[0024] Power electronics used in electrically driven elevator drives generate heat that must be dissipated. This problem is particularly pronounced in compact elevator drives with a high power-to-weight ratio. The heat from power electronic components (e.g., power transistors) can affect or disrupt the function of other electronic components within the drive unit. Some electronic components (e.g., torque cutoff circuits (STOs)) are safety-related and must be kept below specific temperatures for safe operation. Therefore, proper cooling of the power electronics is essential for the drive's functionality.

[0025] The reduced weight and size of elevator drives with increased power make cooling electronic and electromechanical components more difficult.

[0026] In one embodiment, at least one or more heat dissipation paths in the bottom wall portion are designed as recesses in the bottom wall portion.

[0027] The recessed design of the heat dissipation path allows the heat dissipation path (especially the bottom of the heat dissipation path) to be in direct or indirect thermal contact with electronic components (i.e., particularly power transistors), thus enabling heat to be dissipated as efficiently as possible. Therefore, it is possible to provide an electronic component housing that is close to the electronic component to be cooled in the relevant location but provides sufficient space in other areas for easy assembly and any required component tolerances.

[0028] At least one heat dissipation path is designed as a recess in the bottom wall portion, specifically in the viewing direction from the outer wall towards the circuit board and the inner wall. In the opposite viewing direction from the circuit board towards the outer wall, at least one heat dissipation path may appear as a convex or protruding bulge. At least one heat dissipation path typically has a closed bottom in the axial direction and an open side opposite the bottom. On the open side, the heat dissipation path may lead to a channel formed between adjacent heat dissipation fins, or may transition into the channel.

[0029] In one embodiment, the heat dissipation fins of the outer wall include upper heat dissipation fins and lower heat dissipation fins. A channel extends between the heat dissipation fins. A convection barrier is arranged between the upper and lower heat dissipation fins to restrict or prevent airflow in the channel between the lower and upper heat dissipation fins. Specifically, the convection barrier may extend perpendicular to or project perpendicularly from the outer wall, particularly along the axial direction. This means the convection barrier extends in the axial direction. In the radial direction, the convection barrier may extend perpendicular to the heat dissipation fins.

[0030] In one embodiment, the heat dissipation fins of the outer wall include upper and lower heat dissipation fins, channels extending between the fins, and a convection barrier. The convection barrier is arranged to restrict airflow in the channel between the lower and upper heat dissipation fins. Specifically, the convection barrier extends perpendicularly to the outer wall into the channel of the heat dissipation fins. This means that the convection barrier extends in the axial direction. In the radial direction, the convection barrier extends perpendicularly to the heat dissipation fins.

[0031] The upper heat dissipation fins define the upper heat dissipation fin portion, and the lower heat dissipation fins define the lower heat dissipation fin portion.

[0032] A convection barrier prevents heat generated in the lower heat sink fin portion of the electronics housing from being conducted unimpeded to the upper heat sink fin portion via the heat sink fins or the channels between them, thus preventing the heating of that area. This allows for a simple implementation of a single-piece heat sink with a thermal barrier between the two sub-sections (lower and upper heat sink fins). This enables, for example, safety electronics and power electronics to be arranged on the same circuit board (also known as a printed circuit board) and cooled using the same heat sink or electronics housing. Therefore, the electronics housing used as a heat sink can be designed as a single piece without incurring the thermal drawbacks of such a design. This allows for the production of elevator drives in a particularly simple and cost-effective manner. Furthermore, it allows for the elevator drives to be as lightweight as possible.

[0033] Due to the convection barrier, the channels formed between adjacent heat dissipation fins are not continuous. A lower channel exists between adjacent lower heat dissipation fins in each case, and an upper channel exists between adjacent upper heat dissipation fins in each case, wherein the lower and upper channels are separated by the convection barrier. In each case, the lower and upper channels can be arranged sequentially in the extension direction of the heat dissipation fins.

[0034] In one embodiment, the lower and upper heat dissipation fins are separated from each other by a convection barrier. In another embodiment, the heat dissipation fins are continuous. Separation elements (specifically partition walls) can then be arranged in each channel and extend, for example, perpendicular to the extending direction of the heat dissipation fins and the channels. The partition walls together form a convection barrier and divide each channel into a lower and upper channel, or each heat dissipation fin into an upper and lower heat dissipation fin.

[0035] In one embodiment, the convection barrier is formed by an axially outwardly shaped portion of the outer wall or by a portion protruding axially outwardly from the outer wall.

[0036] The outward-facing portion of the outer wall obstructs or interrupts airflow within the channel. Airflow rising due to heat is conducted away from the heatsink and out of the channel at the location of the convection barrier. Therefore, free flow that might otherwise occur through the channel connecting both the lower and upper heatsink fins is avoided. This ensures that heat from the lower heatsink fins does not heat the upper heatsink fins, and thus also ensures that electronic components located behind the upper heatsink fins are not heated.

[0037] In one embodiment, the elevator drive further includes one or more additional heat dissipation paths arranged in the upper portion of the outer wall, i.e., at the upper heat dissipation fins, and positioned relative to the electronic circuitry of the safety section of the electronic device unit. These additional heat dissipation paths may be designed in the same manner as the one or more heat dissipation paths described above and below.

[0038] This elevator drive not only cools the power transistors but also the electronic components in the safety section of the upper section. This additional heat dissipation path, or these additional heat dissipation paths, provides an effective yet simple cooling system for the safety sections of the electronic device unit.

[0039] A convection barrier between the lower and upper sections ensures that the power transistors (i.e., the heat from the power transistors) do not affect the safety components attached to or cooled in the upper section of the outer wall. This allows not only the electromechanical and power electronic components of the drive to be combined, but also the safety components of the elevator drive. Therefore, both parts of the electronic unit can be attached to a printed circuit board (PCB), which can then be passively cooled by a heat sink with a convection barrier. The result is a compact and cost-effective elevator drive with high power density.

[0040] In one embodiment, the electronic device unit includes a power section and a safety section. The power section includes power transistors, and the safety section includes electronic circuit components, including elevator drive control components. The safety section may include a torque tripping circuit (STO).

[0041] The separation of these two electronic components allows for the isolation of heat-sensitive components (safety parts) from heat-generating components (power parts, particularly power transistors). This ensures that the heat-generating power parts are largely thermally separated from the safety parts. In particular, the power parts and safety parts can be thermally isolated from each other. In this way, heat transfer between the safety parts and the power parts is prevented or largely prevented.

[0042] The safety components are heat-sensitive, so it is essential to ensure they are not heated by the power transistors in the power section. Such heating could cause the safety components to malfunction. To ensure the safety of the elevator drive, failure of the safety components must be prevented under all circumstances.

[0043] In one embodiment, the inner wall of the electronic device housing includes a support cylinder for a bearing or bearing. This support cylinder projects axially from the bottom wall portion of the inner wall and forms a bearing support surface designed to receive the outer ring of a bearing coupled to a rotor shaft of a rotor. Thus, the rotor shaft is mounted by a bearing formed or received within the housing.

[0044] The support cylinder is particularly a hollow cylinder, and the supporting surface is the circumferential inner surface of the hollow cylinder, such that the support cylinder circumferentially surrounds the bearing in an annular manner. The outer ring of the bearing may abut against or contact the supporting surface. The bearing may particularly be a rolling bearing and is used to rotatably mount a rotor or rotor shaft in a housing. The bearing may have an inner ring, an outer ring, and rolling elements in a known manner.

[0045] In one embodiment of the elevator drive, the bottom wall portion and the bearing support cylinder are designed to form an air circulation barrier between the inner side of the stator housing and the inner side of the electronics housing. This air circulation barrier prevents air from circulating between the stator and the electronics unit.

[0046] In the same way that convection barriers can thermally separate the two sub-parts of a heat sink fin, air circulation barriers enable thermal separation of the electromechanical components of an elevator drive from its electronic components.

[0047] This ensures that the heat generated in the electromechanical components of the elevator drive does not affect the power or safety components of the electronics. Conversely, it also ensures that the heat from the power electronics does not impose additional thermal stress on the electromechanical components of the elevator drive on top of the heat generated by the components themselves.

[0048] In one embodiment, the bearing support sleeve is connected to or connected to the bottom wall portion of the inner wall via radial reinforcing ribs.

[0049] This allows for a rotor shaft bearing design that is as compact and thermally fit as possible. Therefore, the size of the elevator drive can be reduced, and the power-to-weight ratio can be improved.

[0050] In one embodiment of the elevator drive, the rotor includes a rotor shaft extending between the electronics end and the drive end. Furthermore, the elevator drive includes a rotation sensor or rotation sensor portion attached to the electronics end of the rotor and positioned relative to a complementary rotation sensor or rotation sensor portion attached to the electronics. Complementary in this context means that they cooperate to detect rotor rotation.

[0051] This ensures that the rotation sensor can be housed in the elevator drive in a particularly advantageous and compact manner.

[0052] In one embodiment, the stator housing has heat dissipation fins extending from the tubular bottom wall where the stator is mounted to the edge. The edges of the heat dissipation fins in the lower portion of the housing are designed such that they extend in a plane so that the elevator drive can be stably placed on a flat surface.

[0053] This allows the elevator drive to be placed on a platform or another surface, such as a platform, on the heat dissipation fins located in the lower part of the elevator drive. This helps simplify the handling of the elevator drive during installation and / or maintenance.

[0054] In one embodiment, one or more heat dissipation paths are arranged such that they are mounted toward the circuit board of the electronic device unit. In other words, the heat dissipation paths point toward the circuit board.

[0055] This allows for particularly efficient heat conduction between the electronic components on the circuit board and the housing used as a heat sink.

[0056] In one embodiment, the elevator drive also includes a thermally conductive but non-conductive material disposed between the heat dissipation path and the circuit board.

[0057] This thermally conductive material allows the housing (i.e., the heat dissipation path, i.e., the radiator of the elevator drive) to be directly thermally connected to the components that generate heat during operation, thus ensuring particularly effective heat dissipation.

[0058] In a particularly preferred embodiment, the rotor has a rotor shaft with a traction portion, particularly formed directly within the rotor shaft, for driving the belt via an elevator drive. "Formed directly within the rotor shaft" means that the traction portion and the rotor shaft are formed as a single piece. For example, the traction portion may be designed as a groove in the rotor shaft. The traction portion is particularly located at the drive end of the rotor shaft.

[0059] Using this type of elevator drive, there is no need to install traction pulleys on the rotor shaft. The rotor shaft and its traction section serve as the traction pulleys. Therefore, elevator drives can be provided particularly easily and cost-effectively.

[0060] In another aspect, this disclosure relates to an elevator drive. The elevator drive includes: a housing; a stator disposed within the housing; a rotor rotatably mounted within the stator; and an electronic device unit, wherein the housing includes a stator housing portion and a separately formed electronic device housing portion, the electronic device unit being disposed within the electronic device housing portion, wherein the electronic device housing portion is fastened to the stator housing portion, wherein the electronic device housing portion has an inner wall and an outer wall, the inner wall and the outer wall being connected to each other and forming an intermediate space, the electronic device unit being disposed within the intermediate space, wherein the electronic device unit includes a circuit board and electronic circuit components attached to the circuit board, wherein the electronic circuit components include power transistors, wherein the outer wall of the electronic device housing portion has heat dissipation fins projecting from at least one bottom wall portion of the outer wall, wherein the outer wall has at least one or more heat dissipation paths adjacent to or in contact with the electronic device unit at the location of the power transistor. The elevator drive may in particular be an elevator drive according to the embodiments described above and / or below. Attached Figure Description

[0061] The invention will now be explained in more detail with reference to the embodiments shown in the accompanying drawings. In the drawings: Figure 1 An elevator according to an exemplary embodiment of the present invention is shown; Figure 2A and Figure 2B : is a perspective view of an elevator drive for an elevator according to an exemplary embodiment of the present invention; Figure 3 It is a partial section. Figure 1 A 3D diagram of the elevator driver of elevator A; Figure 4A and Figure 4B :yes Figure 3 A perspective view of a portion of an elevator drive, wherein the electronic components are shown as separate from (not installed) the stator of the elevator drive; Figure 5 :yes Figure 3 A cross-sectional view of the elevator drive unit; Figure 6 : is with Figure 5 A similar view, in which the electronic components are shown as separate from the stator of the elevator drive (not installed); Figure 7 : is an internal view of the outer wall of an electronic device unit according to an exemplary embodiment of the present invention. Detailed Implementation

[0062] Figure 1An exemplary embodiment of an elevator 40 (such as a passenger elevator or a freight elevator) is shown. The elevator 40 includes an elevator shaft 41, an elevator car 42, two counterweights 43, two elevator drives 1 each having a traction portion 18b, a support device 44, and a brake (not shown). The elevator drives 1 are secured to the area of ​​the top plate 45 of the elevator shaft 41, particularly supported on elevator guide rails (not shown) or suspended from the top plate 45 of the elevator shaft 41. The area in the elevator shaft 41 adjacent to the top plate 45 may also be referred to as the shaft head (shaft opening). Therefore, the elevator drives 1 are arranged in the shaft head in a supported / suspended manner. The support device 44 may, for example, have one or more ropes or straps.

[0063] An elevator car 42 is arranged in an elevator shaft 41 for vertical displacement. Counterweights 43 are each connected to the elevator car 42 via corresponding support devices 44. A traction section 18b rotates during operation of the elevator drive 1. Support devices 44 extend around the traction section 18b and are movable so that the elevator car 42 and counterweights 43 can be vertically displaced by the cooperative operation of the elevator drive 1 and the support devices 44. Specifically, the elevator car 42 can be vertically displaced from a first floor having a first entrance 47 to a second floor having a second entrance 46, and vice versa. Optionally, the elevator shaft 41 can extend over more than two floors having corresponding entrances. The counterweights 43 preferably have the same weight. A brake allows for braking and / or securing the elevator car 42. Alternatively or additionally, another brake can be arranged for braking and / or securing the counterweights 43.

[0064] Control devices (not shown) for controlling elevator drive 1 and / or brake can be communicatively coupled to elevator drive 1 or brake. Two elevator drives 1 can be designed in a master-slave configuration. For example, two elevator drives 1 can be synchronized in a torque-controlled manner. Specifically, the two elevator drives 1 are controlled and / or synchronized with each other such that they vertically displace elevator car 42 in a vertically aligned manner and vertically displace counterweight 43 relative to each other in a consistent manner.

[0065] In one embodiment, two elevator drives 1 are alternatively designed to operate (run) in either master or slave mode, wherein one elevator drive 1 operates in master mode and the other elevator drive operates in slave mode. In another embodiment, one elevator drive 1 is specifically designed to operate in master mode and is the master drive, while the other elevator drive is specifically designed to operate in slave mode and is the slave drive. The elevator drive operating in master mode or the master drive typically controls at least partially the elevator drive operating in slave mode or the slave drive.

[0066] Figure 2-7 shows an elevator drive 1, which includes a housing 2, a stator 3 attached to the housing 2, a rotor 4 rotatably mounted in the housing or rotatably mounted relative to the stator 3 by means of bearings 5a, 5b, and an electronics unit 7. The stator 3 has a ferromagnetic armature 9 and a coil 10 attached to the armature 9. The coil 10 is connected to the electronics unit 7 via a connection terminal 28.

[0067] The rotor 4 includes magnets 22 arranged on a rotor shaft 18. The rotor shaft extends from the electronics end 20 to the drive end 29. The drive end 29 is located outside the stator 3 and the housing 2. The rotor shaft 18 has a traction portion 18b, which, in this exemplary embodiment, is configured to cooperate with a belt, chain, or rope. The belt may be, for example, a belt from an elevator system or a conveyor belt. The belt may, of course, be connected to any other drive system.

[0068] The electronic device end 20 of the rotor shaft 18 is attached to the electronic device unit 7 within the housing 2. The rotor magnet 22 and the stator coil 10 can be configured or arranged in various configurations, which are well known in the prior art and will not be further explained here.

[0069] The housing 2 includes a stator housing portion 2a and an electronics housing portion 2b. The stator housing portion 2a surrounds the stator 3 and includes a plurality of heat dissipation fins 23 extending from a generally cylindrical circular housing body in which the stator 3 is disposed. The heat dissipation fins 23 extend from the cylindrical body to an outer edge 48, wherein the outer edges 48 of the fins 23 on the underside of the elevator drive 1 are advantageously aligned such that they are substantially arranged in the same plane P, allowing the elevator drive 1 to be stably placed on a flat surface (such as a platform). This facilitates the transport and installation of the elevator drive 1. The electronics housing portion 2b has a lower edge disposed above or at the same height as the outer edges 48 of the heat dissipation fins 23, so that the lower edge of the electronics housing portion 2b does not affect placement on a flat surface. The electronics housing portion 2b is designed independently of the stator housing portion 2a and includes an outer wall 12 and an inner wall 14. In the exemplary embodiment shown, the electronics housing portion 2b is made of two parts. The inner wall 14 and the outer wall 12 are assembled to form a cavity between them, in which the electronic device unit 7 is disposed. The electronic device unit 7 includes a circuit board 8 and electronic circuit components 32 attached to the circuit board 8. These electronic circuit components 32 include power transistors 33. The circuit board 8 also has connectors 36 for connection to the connection terminals 28 of the stator coil 10.

[0070] Electronic circuit components 32 can be arranged in different parts. In particular, components 32 can be arranged partly in the power section 38a and partly in the safety section 38b. Power transistors 33 are specifically arranged in the power section 38a. The safety section 38b includes electronic devices, such as components for processing elevator drive control signals.

[0071] The safety portion 38b of the electronic unit 7 should be protected from environmental factors. One aspect of the safe operation of the electronic unit 7 is temperature; the safety portion 38b of the electronic unit 7 should be kept below a specific temperature during operation, for example, within the range of 70 to 90°C. Overheating of the electronic unit 7 (especially the safety portion 38b) may impair the function of the elevator drive.

[0072] The electronic circuit component 32 includes a rotation sensor portion or rotation sensor 34 for detecting or determining the rotor angular position. The rotation sensor portion 34 is attached to or mounted on the circuit board 8 and aligned such that it is positioned opposite the rotation sensor portion 30 attached to the electronic end 20 of the rotor shaft 18. Advantageously, the two rotation sensor portions 30, 34 are aligned with each other.

[0073] In the exemplary embodiment shown, the rotation sensor portion 30 is a magnet mounted on the electronic end 20 of the rotor shaft 18 and configured to generate a magnetic field with a radial orientation. The rotation sensor portion 34, mounted on the circuit board 8, is, for example, a Hall sensor or another magnetoresistive sensor, and can detect or measure the rotation of the magnetic field. The angular velocity and angular position of the rotor can be measured in this way. To generate the radial magnetic field, the rotation sensor portion 30 can be formed, for example, from a magnetic disk, wherein two magnetic segments of different polarities are half-discs arranged diametrically opposite (radially) to each other. This arrangement is particularly cost-effective and simple, yet reliable. Therefore, the sensor allows for compact angular measurements and can be conveniently and easily attached to the circuit board at the end of the rotor.

[0074] In other embodiments, an optical sensor or any other type of rotation sensor may be used instead of a magnetic rotation sensor.

[0075] The outer wall 12 of the electronic device housing portion 2b includes heat dissipation fins 24 projecting axially outward from the bottom wall portion 12b. The outer wall 12 includes heat dissipation paths 25 formed in the bottom wall portion 12b. The heat dissipation paths 25 include at least one heat dissipation path 25a or a first plurality of heat dissipation paths 25a disposed near the circuit board 8 at the power transistor 33. Therefore, the heat dissipation paths 25a are arranged such that they can conduct heat generated by the power transistor 33 to the outer wall 12. The heat dissipation paths 25 may include recesses located in the bottom wall portion 12b, which are disposed in such a way that they contact or are at least adjacent to the circuit board 8 opposite to the power transistor. If the power transistors 33 are arranged on the sides of the circuit board such that they are opposite the outer wall 12, one or more heat dissipation paths 25, particularly the bottom of one or more heat dissipation paths 25, may also contact the power transistor 33.

[0076] To improve heat dissipation from the power transistor 33 to the heat dissipation path 25, a thermally conductive and electrically insulating material can be used, for example, in the form of a paste, such as a silicone-based thermal paste. This ensures good thermal contact between the power transistor 33 arranged on the circuit board 8 and the heat dissipation path 25.

[0077] The bottom wall portion 12b may have a heat dissipation path 25b arranged opposite to electronic components (e.g., components of the safety portion 38b). Heat dissipation fins 24b extending from the bottom wall portion 12b opposite to the safety portion 38b are used to cool the safety portion 38b and may be at least partially separated from heat dissipation fins 24a, which protrude from the bottom wall portion 12 at the power portion 38a. The gap between the upper heat dissipation fins 24b and the lower heat dissipation fins 24a can be formed as a convection barrier 40a by a portion protruding outward from the outer wall 12. This outwardly protruding convection barrier 40a forms an airflow barrier between the lower heat dissipation fins 24a and the upper heat dissipation fins 24b, thereby limiting the heat exchange between the two portions and increasing the heat dissipation capacity of the upper portion (safety portion 38b) by allowing cooler ambient air to flow in the space between the heat dissipation fins 24b.

[0078] The inner wall 14 of the electronic device housing 2b advantageously has a bottom wall portion 14b and a support surface 26. The bottom wall portion 14b is integrally formed as a support cylinder 16 for the bearing 5b, and the support surface 26 forms an outer ring for the bearing 5b on the electronic device housing side. The inner wall 14 with the support cylinder 16 also serves as an air exchange barrier between the inner side of the stator housing 2a and the inner side of the electronic device housing 2b, and thus as an air circulation barrier. Therefore, heat generated by the stator coil 10 from the stator 3 is less likely to be transferred to the electronic device housing 2b, and in particular, cannot reach the safety portion 38b of the electronic device unit 7. This arrangement allows for better thermal control of the electronic device unit 7 and also allows for easy assembly of the stator, rotor, and electronic device unit. The inner wall 14 and the support cylinder 16 of the bearing 5b also allow easy access to the rotor shaft at the electronic device end 20, where the rotation sensor portion 30 can be arranged adjacent to the circuit board. The support cylinder 16 of the bearing 5b on the inner wall 14 may be formed with reinforcing ribs 27 to ensure that the radial strength and rigidity of the support cylinder 16 are sufficiently large. The support cylinder 16 is integrally formed with the bottom wall portion 14b and the inner wall 14.

[0079] The inner wall 14 and the outer wall 12 can be connected together with screws, rivets or other fasteners that can be removed or replaced for maintenance of the electronic device unit 7.

[0080] The inner wall 14 includes a cylindrical fastening edge 43 that engages in a complementary cylindrical edge 42 of the stator receiving portion 2a, positions the stator receiving portion 2a, and forms a seal between the electronics receiving portion 2b and the stator receiving portion 2a relative to the electronics receiving portion.

Claims

1. An elevator (40) comprising: - Elevator shaft (41); - An elevator car (42) is arranged in the elevator shaft (41); - At least one counterweight (43) is arranged in the elevator shaft (41) and connected to the elevator car (42) via a support device (44); - At least one elevator drive (1); wherein the elevator drive (1) has a traction portion (18b). The at least one support device (44) extends around the traction portion (18b) of the elevator drive (1) so that the support device (44) can be moved by the elevator drive (1) so that the elevator car (42) and the at least one counterweight (43) can be vertically displaced by operating the elevator drive (1); and - A brake, particularly an elevator car brake, by which the elevator car (42) and / or the counterweight (43) can be braked and / or fixed. The elevator drive (1) includes a housing (2), a stator (3) disposed in the housing (2), a rotor (4) rotatably mounted in the stator (3), and an electronic device unit (7). The housing (2) includes a stator housing portion (2a) and a separately formed electronic device housing portion (2b). The electronic device unit (7) is disposed in the electronic device housing portion (2b), which is fastened to the stator housing portion (2a). The electronic device housing portion (2b) has an inner wall (14) and an outer wall (12) connected to each other to form an intermediate section. The electronic device unit (7) is disposed in the intermediate space, wherein the electronic device unit (7) includes a circuit board (8) and electronic circuit components (32) attached to the circuit board (8), wherein the electronic circuit components (32) include a power transistor (33), wherein the outer wall (12) of the electronic device housing portion (2b) has heat dissipation fins (24) protruding from at least one bottom wall portion (12a, 12b) of the outer wall (12), wherein the outer wall (12) has at least one or more heat dissipation paths (25) adjacent to or in contact with the electronic device unit (7) at the location of the power transistor (33).

2. The elevator (40) according to claim 1, wherein, The at least one or more heat dissipation paths (25) in the bottom wall portion (12b) are designed in the form of a recess in the bottom wall portion (12b).

3. The elevator according to any one of the preceding claims, wherein, The radial extension direction of the heat dissipation fins is vertical or substantially vertical.

4. The elevator according to any one of the preceding claims, wherein, The elevator drive is designed to passively, and in particular only passively, dissipate the heat generated in the electronic device unit (7) through the heat dissipation fins (24).

5. The elevator (40) according to any one of the preceding claims, wherein, The heat dissipation fins (24) of the outer wall (12) include an upper heat dissipation fin (24b) and a lower heat dissipation fin (24a), wherein a channel extends between the heat dissipation fins (24), wherein a convection barrier (40a) is arranged between the upper heat dissipation fin (24a) and the lower heat dissipation fin (24b) to restrict or prevent airflow in the channel between the lower heat dissipation fin (24a) and the upper heat dissipation fin (24b).

6. The elevator (40) according to claim 5, wherein, The convection barrier (40a) is formed by an axially outwardly shaped portion of the outer wall (12), wherein the shaped portion extends perpendicular to the outer wall (12), and wherein the convection barrier (40a) terminates in the plane of the end of the heat dissipation fin (24).

7. The elevator (40) according to any one of the preceding claims further includes an additional heat dissipation path or a plurality of additional heat dissipation paths (25b), which are arranged in the upper portion of the outer wall (12) and opposite to the electronic circuit components (32) of the safety portion (38b) of the electronic device unit (7).

8. The elevator (40) according to any one of the preceding claims, wherein, The electronic device unit (7) includes a power section (38a) and a safety section (38b). The power section includes a power transistor (33), and the safety section includes electronic circuit components, including elevator drive control components.

9. The elevator (40) according to claim 8, wherein, The power section and the safety section are thermally separated from each other.

10. The elevator (40) according to any one of the preceding claims, wherein, The inner wall (14) of the electronic device housing portion (2b) includes a bearing support cylinder (16), wherein the support cylinder (16) protrudes axially from the bottom wall portion (14b) of the inner wall and forms a support surface (26) of the bearing, wherein the support cylinder (16) is designed to receive the outer ring of the bearing (5b) connected to the rotor shaft (18) of the rotor (4).

11. The elevator (40) according to claim 10, wherein, The bottom wall portion (14b) and the bearing support cylinder (16) are designed such that they form an air circulation barrier between the inside of the stator housing portion (2a) and the inside of the electronic device housing portion (2b), wherein the air circulation barrier restricts or prevents air circulation between the stator (3) and the electronic device unit (7).

12. The elevator (40) according to any one of the preceding claims, wherein, The bearing support cylinder (16) is connected to the bottom wall portion (14b) of the inner wall by radial reinforcing ribs (27).

13. The elevator (40) according to any one of the preceding claims, wherein, The rotor (4) includes: a rotor shaft (18) extending between the electronic end (20) and the drive end (29) of the driver (29); and a rotation sensor (30) attached to the rotor at the electronic end (20) and positioned relative to a rotation sensor (30) designed to be complementary to and attached to the electronic end.

14. The elevator (40) according to any one of the preceding claims, wherein, The stator housing portion (2a) has heat dissipation fins (23) that extend from the tubular bottom wall on which the stator is mounted to the edge and axially along the tubular bottom wall, wherein at least the edges of the heat dissipation fins (23) in the lower portion of the housing (2) are designed such that they extend in a plane (P) so that the elevator drive (1) can be stably placed on a flat surface.

15. The elevator (40) according to any one of the preceding claims, wherein, One or more of the heat dissipation paths (25) are arranged such that they are mounted toward the circuit board (8) of the electronic device unit (7).

16. The elevator (40) according to any one of the preceding claims, further comprising: - A second counterweight (43), which is arranged in the elevator shaft (41); - Second elevator drive (1), the second elevator drive (1) has a traction part (18b); as well as - A second support device (44) is connected to the elevator car (42) and the second counterweight (43), and the second support device (44) extends around the traction portion (18b) of the second elevator drive (1) so that the second support device (44) can be moved by the second elevator drive (1) so that the elevator car (42) and the second counterweight (43) can be vertically displaced by operating the elevator drive (1).

17. The elevator (40) according to claim 16, wherein, The elevator drive (1) is a master drive and / or is configured to operate in master mode, and wherein the other elevator drive (1) is a slave drive and / or is configured to operate in slave mode.

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