Lift with drive having cooling means
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- INVENTIO AG
- Filing Date
- 2024-08-06
- Publication Date
- 2026-07-08
Smart Images
Figure EP2024072184_06032025_PF_FP_ABST
Abstract
Description
[0001] ELEVATOR WITH COOLANT DRIVE
[0002] The present invention relates to an elevator with at least one elevator drive.
[0003] 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 for the elevator components to be as light and small as possible, or not to exceed a certain weight / size. Such a weight is, for example, 30 kg, since people in most countries are allowed to carry up to 30 kg. An elevator component weighing less than 30 kg can therefore be carried by one person in most countries. This means that no additional personnel are required for installation and maintenance.
[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. However, previously known drive systems for elevator systems require a lot of space, for example, in the headroom of an elevator system, or require complex installation.
[0005] The object of the invention is to provide an elevator and in particular an elevator drive which is improved compared to the elevators known from the prior art, wherein in particular the space requirement of the elevator drive is to be reduced or the assembly of the elevator drive is to be simplified.
[0006] In this document, unless otherwise stated, the term "axial" refers to a direction along or parallel to a drive axis, corresponding to the direction of the rotational axis of its rotor, in particular its rotor shaft. Directions perpendicular to the axial direction are referred to as "radial." Directional terms such as "above," "below," "horizontal," "vertical," unless otherwise stated, are usually referred to with reference to the direction of gravity from top to bottom and also refer to a typical installation position with the drive rotor oriented horizontally. The vertical direction is a radial direction. However, this does not preclude use in other orientations.
[0007] The problem is solved by an elevator according to the independent claim.
[0008] The invention comprises an elevator comprising:
[0009] - an elevator shaft;
[0010] - a car arranged in the elevator shaft;
[0011] - at least one counterweight arranged in the elevator shaft and coupled to the elevator car via at least one support means; at least one elevator drive; wherein the elevator drive has a traction section; wherein the at least one support means extends over a traction section of the elevator drive such that the support means is movable by means of the elevator drive, so that the elevator car and the at least one counterweight are vertically displaceable by operating the elevator drive; and
[0012] - a brake, in particular a car brake, by means of which the car and / or the counterweight can be braked and / or locked.
[0013] In one embodiment, the elevator further comprises a second counterweight arranged in the elevator shaft, a second elevator drive with a traction section and a second support means which is coupled to the elevator car and the second counterweight and which support means extends over the traction section of the second elevator drive such that the support means is movable by means of the second elevator drive, so that the elevator car and the second counterweight can be displaced vertically by operating the elevator drive.
[0014] By using two elevator drives, each individual elevator drive is lighter.
[0015] Since the elevator described above and below comprises two elevator drives, it is particularly advantageous to provide a car brake. The use of two elevator drives to move a car makes it possible to distribute the loads to be moved between two elevator drives, so that each of the elevator drives only has to move half the load. This allows each of the elevator drives to be designed to be particularly small and / or lightweight. Such an elevator drive is particularly easy to handle, especially by one person alone. Furthermore, such an elevator drive can be designed to be particularly compact, thus requiring very little space. This makes it possible to attach the elevator drive, for example, to a ceiling of the elevator shaft. A separate space above the elevator shaft for arranging the elevator drive is not necessary. In one embodiment, the weight of the elevator drive does not exceed 30 kg.
[0016] The elevator can be a freight or passenger elevator, for example. The two counterweights are preferably of equal weight. The suspension elements can each comprise one, two, or more ropes and / or belts.
[0017] According to one embodiment of the elevator, the elevator drives are arranged suspended from a ceiling of the elevator shaft in the elevator shaft.
[0018] An area adjacent to the ceiling in the elevator shaft can also be referred to as the shaft head. This allows the elevator drives to be suspended or supported in the shaft head. This eliminates the need for a separate room, particularly a machine room, for arranging the elevator drives above the elevator shaft. This contributes to a particularly compact design of the entire elevator.
[0019] Optionally, the elevator can have a control device for controlling the elevator drives. The control device can have a processor configured to control the elevator drives so that they move the corresponding support means, and thus the counterweights and the elevator car, synchronously. The control device can include hardware and / or software modules. In addition to the processor, the control device can include a memory and data communication interfaces for data communication with peripheral devices.
[0020] According to the claim, the elevator drive comprises a housing, a stator arranged in the housing, a rotor rotatably mounted around the stator, and an electronics unit. The housing comprises a stator housing part and a separately molded electronics housing part in which the electronics unit is arranged. The electronics housing part is fastened to the stator housing part. The electronics housing part comprises an inner wall and an outer wall that are connected to one another, and an intermediate space in which the electronics unit is provided. The electronics unit comprises a printed circuit board and electronic circuit components mounted thereon. The electronic circuit components contain power transistors. The outer wall of the electronics housing part has heat dissipation fins or cooling fins protruding from at least one bottom wall part of the outer wall.The radial extension direction of the heat dissipation fins is typically a main extension direction of the heat dissipation fins.
[0021] In one embodiment, the radial extension direction of the heat dissipation fins is vertical or substantially vertical. In other words, the heat dissipation fins run vertically or substantially vertically. Such an arrangement ensures particularly good heat dissipation, since the air heated by the heat dissipation fins is efficiently discharged upwards through the channels.
[0022] In one embodiment, the elevator drive is designed for passive, in particular exclusively passive, dissipation of heat generated in the electronics unit by means of the heat dissipation fins. This means that the electronics unit is cooled passively by convection cooling. In particular, the elevator drive advantageously does not include a fan or blower for cooling the electronics unit.
[0023] In one embodiment, the axis of rotation of the rotor is horizontal or substantially horizontal, or perpendicular or substantially perpendicular to gravity.
[0024] Furthermore, in one embodiment, the circuit board extends perpendicularly or substantially perpendicularly to the rotor, in particular a rotor shaft. In other words, a longitudinal axis of the rotor or rotor shaft is perpendicular to the circuit board.
[0025] According to the claim, the outer wall further comprises at least one or more heat ducts in the immediate vicinity of or in contact with the electronics unit at a location where the power transistors are located. This proves to be advantageous because the elevator drive can thus be constructed particularly compactly, i.e., with a high power-to-weight ratio. It also proves to be advantageous that, despite the compact design, the cooling of the electronic components, in particular the power transistors, is enabled in a relatively simple manner by heat ducts formed in the housing. The combination of the electric motor and the electronics housing section allows for space savings. This creates an elevator drive that can meet temperature and power requirements even with a compact design.The design of passive cooling by means of heat shafts formed in a housing wall is a particularly easy-to-manufacture and cost-effective way of designing an elevator drive with an increased power-to-weight ratio.
[0026] Increased torque and power-to-weight ratio of elevator drives mean they can be used in a wider range of applications, reducing the number of elevator drives required for a specific elevator application. Achieving a high power-to-weight ratio is therefore advantageous, keeping elevator installation and maintenance costs low. The reliability of the elevator drive is often crucial, as a failure of the elevator drive compromises the safety of the elevator and significantly impacts the costs associated with repairing the elevator.
[0027] The power electronics used to electrically drive the elevator drive 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 the power electronic components (e.g., power transistors) can affect or disrupt the function of other electronic components in the electronics unit. Some electronic components are safety-critical (e.g., a torque off-state (STO) circuit) and must be kept below a certain temperature to function safely. Appropriate cooling of the power electronics can therefore be essential for the drive's functionality. A reduced weight and size of the elevator drive with increased power makes cooling the electronic and electromechanical components difficult.
[0028] In one embodiment, the at least one heat well or the plurality of heat wells in the bottom wall part are formed in the form of a recess in the bottom wall part.
[0029] By designing the heat sinks in the form of recesses, it is possible for the heat sinks, especially the bottom of the heat sinks, to be in direct or indirect thermal contact with the electronic components, especially the power transistors, thus enabling the most efficient heat dissipation possible. This makes it possible to create an electronics housing component that is close to the electronics to be cooled at the relevant points, yet offers sufficient space in other areas for convenient assembly and any required component tolerances.
[0030] The design of the at least one heat conduction shaft as a recess in the base wall part relates in particular to a viewing direction from the outer wall toward the circuit board and the inner wall. In an opposite viewing direction from the circuit board toward the outer wall, the at least one heat conduction shaft can appear as a convex or protruding bulge. The at least one heat conduction shaft typically has a closed base in the axial direction and an open side opposite the base. At the open side, a heat conduction shaft can open into a channel formed between adjacent heat dissipation fins or can merge into a channel.
[0031] In one embodiment, the heat dissipation fins of the outer wall comprise upper heat dissipation fins and lower heat dissipation fins. Channels run between the heat dissipation fins. A convection barrier is arranged between the upper heat dissipation fins and the lower heat dissipation fins in such a way that air flow in the channels between the lower heat dissipation fins and the upper heat dissipation fins is restricted or prevented. In particular, the convection barrier can run perpendicular to the outer wall or protrude perpendicularly from the outer wall, in particular in the axial direction. This means that the convection barrier runs in the axial direction. In the radial direction, the convection barrier can run perpendicular to the heat dissipation fins.
[0032] In one embodiment, the heat dissipation fins of the outer wall comprise upper heat dissipation fins and lower heat dissipation fins, channels running between the fins, and a convection barrier. The convection barrier is arranged such that air flow in the channels between the lower heat dissipation fins and the upper heat dissipation fins is restricted. In particular, the convection barrier runs perpendicular to the outer wall in the channels of the heat dissipation fins. This means that the convection barrier runs in the axial direction. In the radial direction, the convection barrier runs perpendicular to the heat dissipation fins.
[0033] The upper heat dissipation fins define an upper heat dissipation fin section and the lower heat dissipation fins define a lower heat dissipation fin section.
[0034] The convection barrier prevents heat generated in the lower heat dissipation fin section in the electronics housing part from being conducted unhindered via the heat dissipation fins or the channels between them to the upper heat dissipation fin section, thus heating this area. This makes it easy to create a one-piece heat sink with a thermal barrier between two sections (lower and upper heat dissipation fins). This makes it possible, for example, to arrange the safety electronics and power electronics on the same printed circuit board (also called a print) and to cool them with the same heat sink or electronics housing part. This allows the electronics housing part serving as the heat sink to be made in one piece without having to accept the thermal disadvantages otherwise associated with this design.This allows for particularly simple and cost-effective production of the elevator drive. Furthermore, it enables the elevator drive to be as lightweight as possible.
[0035] Due to the convection barrier, the channels formed between adjacent heat dissipation fins are not continuous. A lower channel is provided between adjacent lower heat dissipation fins, and an upper channel is provided between adjacent upper heat dissipation fins, with the lower and upper channels separated by the convection barrier. A lower and an upper channel can be arranged one behind the other in the direction of extension of the heat dissipation fins.
[0036] In one embodiment, the lower heat dissipation fins and the upper heat dissipation fins are separated from each other by the convection barrier. In another embodiment, the heat dissipation fins are continuous. A separating element, in particular a partition wall, can then be arranged in each of the channels, extending, for example, perpendicular to the direction of extension of the heat dissipation fins and the channels. The partition walls together form the convection barrier and divide each channel into a lower channel and an upper channel, or each heat dissipation fin into an upper heat dissipation fin and a lower heat dissipation fin.
[0037] In one embodiment, the convection barrier is formed by a part of the outer wall that is shaped axially outwards or projects axially outwards from the outer wall.
[0038] The outwardly shaped portion of the outer wall impedes or even interrupts airflow in the channels. The airflow rising from the heat is directed out of the channels at the point of the convection barrier, away from the heat sink. This prevents the otherwise unhindered flow through a channel running across both the lower and upper heat dissipation fin sections. This ensures that heat from the lower heat dissipation fin section does not heat the heat dissipation fins of the upper section, thus preventing electronic components located behind the upper heat dissipation fin section from heating up.
[0039] In one embodiment, the elevator drive additionally comprises a further heat shaft or a plurality of further heat shafts arranged in an upper part of the outer wall, i.e., near the upper heat dissipation fins located opposite electronic circuit components of a safety part of the electronics unit. The further heat shaft or the further heat shafts can be designed in the same way as the heat shaft or heat shafts described above and below.
[0040] Such an elevator drive not only allows for cooling of the power transistors, but also, in the upper section, for cooling of electronic components of a safety section. This additional heat shaft or shafts provides an efficient yet simple cooling system for the safety section of the electronic unit.
[0041] The convection barrier, located between the lower and upper sections, ensures that the power transistors, i.e., their heat, does not affect the safety section mounted and cooled above in the upper section of the outer wall. This allows not only the electromechanical and power electronics sections of the drive to be combined, but also the safety section of the elevator drive. The two parts of the electronics unit can be mounted on a printed circuit board, with the printed circuit board in turn being passively cooled by a heat sink with a convection barrier. The result is a compact and cost-effective elevator drive with a high power density.
[0042] In one embodiment, the electronics unit comprises a power section, which includes the power transistors, and a safety section, which includes electronic circuit components, including elevator drive control components. The safety section may include a torque off (STO) circuit.
[0043] The separation of these two electronic components enables the separation of thermally sensitive components (the safety section) from heat-generating components (the power section, especially the power transistors). This ensures that the power section, which generates heat, is largely thermally separated from the safety section. In particular, the power section and the safety section can be thermally separated from each other. In this way, heat transfer between the safety section and the power section is prevented or largely prevented. The safety section is thermally sensitive, and it must therefore be ensured that it is not heated up by the power transistors of the power section. Such heating could lead to a failure of the safety section. A failure of the safety section must be prevented under all circumstances to ensure the safety of the elevator drive.
[0044] In one embodiment, the inner wall of the electronics housing part comprises a support cylinder of a bearing or for a bearing. This support cylinder protrudes axially from the bottom wall part of the inner wall and forms a support surface of the bearing, which is designed to accommodate an outer ring of the bearing coupled to the rotor shaft. Thus, the support of the rotor shaft is made possible by a bearing that is formed or accommodated in the housing.
[0045] The support cylinder is, in particular, a hollow cylinder, and the bearing surface is the circumferential inner surface of the hollow cylinder, so that the support cylinder surrounds the bearing in a ring-like manner. An outer ring of the bearing can rest against the bearing surface or be in contact with it. The bearing can, in particular, be a rolling bearing and serves to rotatably support the rotor or rotor shaft in the housing. The bearing can have an inner ring, an outer ring, and rolling elements in a known manner.
[0046] In one embodiment of the elevator drive, the base wall part and the support cylinder of the bearing are configured to form an air circulation barrier between an inner side of the stator housing part and an inner side of the electronics housing part. The air circulation barrier prevents air circulation between the stator and the electronics unit.
[0047] Just as the convection barrier enables the thermal separation of the two sections of the heat dissipation fins, the air circulation barrier enables the thermal separation of the electromechanical part of the elevator drive from the electronics of the elevator drive. This ensures that the heat generated in the electromechanical part of the elevator drive does not affect the power or safety components of the electronics. Conversely, it can also ensure that the heat from the power electronics part does not place additional thermal stress on the electromechanical part of the elevator drive.
[0048] In one embodiment, the support cylinder of the bearing is connected to or with the bottom wall part of the inner wall by radial stiffening ribs.
[0049] This provides the most compact and thermally suitable design for the rotor shaft bearing possible. This allows the volume of the elevator drive to be reduced and the power-to-weight ratio to be improved.
[0050] In one embodiment of the elevator drive, the rotor comprises a rotor shaft extending between an electronics end and a drive end. Furthermore, the elevator drive comprises a rotation sensor or rotation sensor part attached to the electronics end of the rotor, which is opposite a complementary rotation sensor or rotation sensor part attached to the electronics. "Complementary" in this context means that they interact to detect the rotor rotation.
[0051] This ensures a particularly advantageous and compact way of accommodating the rotation sensor in the elevator drive.
[0052] In one embodiment, the stator housing part has heat dissipation fins extending from a tubular base wall in which the stator is mounted and extending into the edges. The edges of the heat dissipation fins in the lower part of the housing are designed to run in a plane, allowing the elevator drive to be stably positioned on a flat surface.
[0053] This allows the elevator drive to be placed on the heat dissipation fins located in the lower part of the elevator drive, for example, on a table or other surface. This helps simplify handling of the elevator drive during installation and / or maintenance. In one embodiment, the one or more heat sinks are arranged such that they are mounted against the circuit board of the electronics unit. In other words, the heat sinks face the circuit board.
[0054] This allows for particularly efficient thermal conductivity to be achieved between the electronic units of the circuit board and the housing, which serves as a heat sink.
[0055] In one embodiment, the elevator drive further comprises a thermally conductive and electrically non-conductive material arranged between the heat shafts and the circuit board.
[0056] This thermally conductive material allows the housing, i.e. the heat shafts, i.e. the heat sink of the elevator drive, to be thermally connected directly to the components that generate heat during operation, thus ensuring particularly efficient heat dissipation.
[0057] In a particularly preferred embodiment, the rotor has a rotor shaft with a traction section, in particular formed directly in the rotor shaft, for driving a belt through the elevator drive. Formed directly in the rotor shaft means that the traction section and the rotor shaft are formed integrally. Thus, the traction section can be formed as grooves in the rotor shaft. The traction section is located in particular at the drive end of the rotor shaft.
[0058] With such an elevator drive, the need to mount a traction sheave on the rotor shaft is eliminated. The rotor shaft, with its traction section, serves as the traction sheave. This makes the elevator drive particularly lightweight and cost-effective.
[0059] In a further aspect, the present disclosure relates to an elevator drive. The elevator drive comprises a housing, a stator arranged in the housing, a rotor rotatably mounted within the stator, and an electronics unit. The housing comprises a stator housing part and a separately molded electronics housing part in which the electronics unit is arranged. The electronics housing part is fastened to the stator housing part. The electronics housing part has an inner wall and an outer wall that are connected to one another and form a space in which the electronics unit is provided. The electronics unit comprises a printed circuit board and electronic circuit components mounted thereon. The electronic circuit components comprise power transistors. The outer wall of the electronics housing part has heat dissipation fins protruding from at least a bottom wall portion of the outer wall.wherein the outer wall has at least one or more heat ducts in the immediate vicinity of or in contact with the electronics unit at a location of the power transistors. The elevator drive can, in particular, be an elevator drive according to an embodiment described above and / or below.
[0060] The invention is further explained below using exemplary embodiments in the figures. Herein:
[0061] Fig. 1 : shows an elevator according to an embodiment of the invention.
[0062] Fig. 2A and 2B: a perspective view of the elevator drive of the elevator according to an embodiment of the invention;
[0063] Fig. 3: a perspective view of the elevator drive of the elevator of Fig.
[0064] 1A with a partial cross-section;
[0065] Fig. 4A and 4B: perspective views of a part of the elevator drive of Fig. 3 with the electronics unit shown away (unmounted) from the stator of the elevator drive;
[0066] Fig. 5: a cross-sectional view of the elevator drive from Fig. 3;
[0067] Fig. 6: a similar view to Fig. 5 with the electronic unit off
[0068] (unassembled) of the stator of the elevator drive; Fig. 7: an internal view of the outer wall of the electronics unit according to an embodiment of the invention.
[0069] Fig. 1 shows an exemplary embodiment of an elevator 40, such as a passenger or freight elevator. The elevator 40 has an elevator shaft 41, a car 42, two counterweights 43, two elevator drives 1, each having a traction section 18b, suspension means 44, and a brake (not shown). The elevator drives 1 are fastened in the region of the ceiling 45 of the elevator shaft 41, in particular supported on a guide rail of the elevator (not shown) or suspended from the ceiling 45 of the elevator shaft 41. An area in the elevator shaft 41 that borders the ceiling 45 can also be referred to as the shaft head. Thus, the elevator drives 1 are arranged supported / suspended in the shaft head. The suspension means 44 can, for example, comprise one or more ropes or belts.
[0070] The elevator car 42 is arranged vertically displaceably in the elevator shaft 41. The counterweights 43 are each connected to the elevator car 42 via the corresponding support means 44. The traction sections 18b rotate during operation of the elevator drive 1. The support means 44 runs over the traction section 18b and is movable such that the elevator car 42 and the counterweight 43 can be vertically displaced by operating the elevator drive 1 in cooperation with the support means 44. In particular, the elevator car 42 can be vertically displaced from a first floor with a first access 47 to a second floor with a second access 46, or vice versa. Optionally, the elevator shaft 41 can extend over more than two floors with corresponding accesses. The counterweights 43 are preferably of equal weight. The brake enables the elevator car 42 to be decelerated and / or immobilized.Alternatively or additionally, a further brake may be arranged to slow down and / or lock the counterweight 43.
[0071] A control device (not shown) for controlling the elevator drive 1 and / or the brake can be communicatively coupled to the elevator drive 1 or the brake. The two elevator drives 1 can be configured in a master-slave configuration. For example, the two elevator drives 1 can be torque-controlled and synchronized. In particular, the two elevator drives 1 are controlled and / or synchronized to each other such that they vertically align the elevator car 42 and evenly displace the counterweights 43 vertically relative to each other.
[0072] In one embodiment, both elevator drives 1 are designed for alternative operation in a master mode or a slave mode, with one of the elevator drives operating in master mode and the other in slave mode. In a further embodiment, one of the elevator drives 1 is designed exclusively for operation in master mode and is a master drive, and the other is designed exclusively for operation in slave mode and is a slave drive. The elevator drive operating in master mode, or the master drive, typically at least partially controls the elevator drive operating in slave mode, or the slave drive.
[0073] Figures 2-7 show an elevator drive 1 comprising a housing 2, a stator 3 mounted in the housing 2, a rotor 4 rotatably mounted in the housing or relative to the stator 3 with the positions 5a, 5b, and an electronics unit 7. The stator 3 has a ferromagnetic armature 9 and a coil 10 mounted on the armature 9. The coils 10 are connected to the electronics unit 7 via the connecting terminals 28.
[0074] The rotor 4 comprises magnets 22 arranged on the rotor shaft 18. The rotor shaft extends from an electronics end 20 to a drive end 29. The drive end 29 is located outside the stator 3 and the housing 2. The rotor shaft 18 comprises a traction section 18b, which in the present embodiment is designed to interact with a belt, a chain, or a rope. The belt can, for example, be a belt of an elevator system or a conveyor belt. The belt can, of course, be connected to any other transmission system.
[0075] The electronics end 20 of the rotor shaft 18 is mounted within the housing 2 opposite the electronics unit 7. The rotor magnets 22 and the stator coils 10 can be configured or arranged in various configurations that are well known in the art and are not further explained here.
[0076] The housing 2 comprises a stator housing part 2a and an electronics housing part 2b. The stator housing part 2a surrounds the stator 3 and includes a plurality of heat dissipation fins 23 extending from a substantially cylindrical, round housing body in which the stator 3 is arranged. The heat dissipation fins 23 extend from the cylindrical body to an outer edge 48. The outer edge 48 of the fins 23 on an underside of the elevator drive 1 is advantageously aligned such that they are arranged substantially in the same plane P, so that the elevator drive 1 can be stably placed on a flat surface, such as a table. This facilitates the transport and installation of the elevator drive 1.The electronics housing part 2b has a lower edge that is arranged above or at the same height as the outer edge 48 of the heat dissipation fins 23, so that the lower edge of the electronics housing part 2b does not interfere with level placement. The electronics housing part 2b is designed separately from the stator housing part 2a and comprises an outer wall 12 and an inner wall 14. In the illustrated embodiment, the electronics housing part 2b is made of two parts. The inner wall 14 and the outer wall 12 are assembled such that a cavity is formed between them, in which the electronics unit 7 is arranged. The electronics unit 7 comprises a printed circuit board 8 and electronic circuit components 32 mounted on the printed circuit board 8. These electronic circuit components 32 include power transistors 33. The circuit board 8 further has connectors 36 for the connection to the terminals 28 of the stator coils 10.
[0077] The electronic circuit components 32 can be arranged in different sections. Specifically, the components 32 can be arranged partially in a power section 38a and partially in a safety section 38b. Power transistors 33 are arranged, in particular, in the power section 38a. The safety section 38b includes electronics, such as components for processing elevator drive control signals.
[0078] The safety part 38b of the electronics unit 7 should be protected against environmental factors. One of the possible aspects for the safe operation of the electronics unit 7 is temperature, whereby the safety part 38b of the electronics unit 7 should remain below a certain temperature during operation, such as in the range of 70 to 90°C. Excessive heating of the electronics unit 7, and in particular of the safety part 38b, could impair the functionality of the elevator drive. The electronic circuit components 32 include a rotation sensor part or rotation sensor 34 for detecting or determining the rotor angular position of the rotor. The rotation sensor part 34 is attached to the circuit board 8 or mounted on the circuit board 8 and oriented such that it faces a rotation sensor part 30 attached to the electronics end 20 of the rotor shaft 18.Advantageously, both rotation sensor components 30, 34 are aligned with each other.
[0079] In the illustrated embodiment, the rotation sensor part 30 is a magnet mounted on the electronics end 20 of the rotor shaft 18, which is designed to generate a magnetic field with a radial orientation. The rotation sensor part 34 mounted on the circuit board 8 is, for example, a Hall sensor or other magnetic resistance sensor and can detect or measure rotation of the magnetic field. The angular velocity and position of the rotor can be measured in this way. To generate the radial magnetic field, the rotation sensor part 30 can be formed, for example, by a magnetic disk or disc in which two magnetic segments with different polarity are disk halves arranged diametrically opposite one another. The arrangement described above is particularly cost-effective and simple, yet reliable.The sensor thus allows for a compact angle measurement and can be conveniently and easily mounted on the circuit board at the end of the rotor.
[0080] In other embodiments, an optical sensor or any other type of rotation sensor may be used instead of the magnetic rotation sensor.
[0081] The outer wall 12 of the electronics housing part 2b comprises heat dissipation fins 24, which protrude axially outward from a bottom wall part 12b. The outer wall 12 comprises heat sinks 25, which are formed in the bottom wall part 12b. The heat sinks 25 comprise at least one heat sink 25a or a first plurality of heat sinks 25a, which are arranged near the circuit board 8 at the power transistors 33. The heat sinks 25a are thus arranged such that they can conduct the heat generated by the power transistors 33 into the outer wall 12. The heat sinks 25 can comprise an indentation in the bottom wall part 12b, which is arranged in the bottom wall part such that it is brought into contact with, or at least into the immediate vicinity of, the circuit board 8 opposite the power transistors.When the power transistors 33 are arranged on the side of the circuit board so as to face the outer wall 12, the heatsink 25 or heatsinks 25, in particular a bottom of the heatsink 25 or heatsinks 25, may also be in contact with the power transistors 33.
[0082] To improve heat dissipation from the power transistors 33 to the heat sinks 25, thermally conductive and electrically insulating material, for example in the form of a paste, such as silicone-based thermal paste, can be used. This ensures that the power transistors 33 arranged on the circuit board 8 are in good thermal contact with the heat sinks 25.
[0083] The bottom wall portion 12b can have a heat shaft 25b, which is arranged opposite the electronic components, for example, components of the safety part 38b. The heat dissipation fins 24b extending from the bottom wall portion 12b opposite the safety part 38b serve to cool the safety part 38b and possibly at least partially separate it from the heat dissipation fins 24a, which protrude from the bottom wall portion 12 at the power part 38a. The separation between the upper heat dissipation fins 24b and the lower heat dissipation fins 24a can be implemented by a portion protruding outward from the outer wall 12 as a convection barrier 40a.This outwardly projecting convection barrier 40a forms a barrier to the air flow between the lower heat dissipation fins 24a and the upper heat dissipation fins 24b, thereby limiting the amount of heat exchanged between the two sections and increasing the heat dissipation capacity of the upper section (safety part 38b) by allowing colder ambient air to flow in the space between the heat dissipation fins 24b.
[0084] The inner wall 14 of the electronics housing part 2b advantageously has a bottom wall part 14b, which is integrally designed as a support cylinder 16 of the bearing 5b, and a support surface 26, which forms an outer ring for the electronics housing-side bearing 5b. The inner wall 14 with the support cylinder 16 further serves as a barrier for the exchange of air between the inside of the stator housing part 2a and the inside of the electronics housing part 2b, thus acting as an air circulation barrier. Heat from the stator 3, which is generated by the stator coils 10, can thus be less easily transferred into the electronics housing part 2b and, in particular, cannot reach the safety part 38b of the electronics unit 7. This arrangement allows for better thermal control of the electronics unit 7 and also enables simple assembly of the stator, rotor, and electronics unit.The inner wall 14 and the support cylinder 16 of the bearing 5b further enable easy access to the rotor shaft at the electronics end 20, where the rotation sensor part 30 is located in close proximity to the circuit board. The support cylinder 16 of the bearing 5b of the inner wall 14 can be designed with stiffening ribs 27 to ensure that the radial strength and rigidity of the support cylinder 16 is sufficiently large. The support cylinder 16 is formed integrally with the bottom wall part 14b and the inner wall 14.
[0085] The inner wall 14 and the outer wall 12 can be joined together with screws or rivets or other fixing means that can be removed or replaced for maintenance (of the electronics unit 7). The inner wall 14 includes a cylindrical mounting edge 43 that engages a complementary cylindrical edge 42 of the stator housing part 2a, positions the stator housing part 2a, and forms a seal between the electronics housing part and the stator housing part 2a relative to the electronics housing part 2b.
Claims
Claims 1. Elevator (40) comprising: - a lift shaft (41); - a car (42) arranged in the elevator shaft (41); - at least one counterweight (43) arranged in the elevator shaft (41) and coupled to the elevator car (42) via at least one support means (44); at least one elevator drive (1); wherein the elevator drive (1) has a traction section (18b); wherein the at least one support means (44) extends over the traction section (18b) of the elevator drive (1) such that the support means (44) is movable by means of the elevator drive (1), so that the elevator car (42) and the at least one counterweight (43) are vertically displaceable by operating the elevator drive (1); and - a brake, in particular a car brake, by means of which the car (42) and / or the counterweight (43) can be braked and / or locked, wherein the elevator drive (1) comprises a housing (2), a stator (3) arranged in the housing (2), a rotor (4) rotatably mounted within the stator (3), and an electronics unit (7), wherein the housing (2) comprises a stator housing part (2a) and a separately formed electronics housing part (2b) in which the electronics unit (7) is arranged, wherein the electronics housing part (2b) is fastened to the stator housing part (2a), wherein the electronics housing part (2b) has an inner wall (14) and an outer wall (12) which are connected to one another and form an intermediate space in which the electronics unit (7) is provided, wherein the electronics unit (7) comprises a printed circuit board (8) and electronic circuit components (32) mounted thereon, wherein the electronic circuit components (32) are power transistors (33) include,wherein the outer wall (12) of the electronics housing part (2b) has heat dissipation fins (24) protruding from at least one bottom wall part (12a, 12b) of the outer wall (12), wherein the outer wall (12) has at least one or more heat shafts (25) in the immediate vicinity of or in contact with the electronics unit (7) at a location of the power transistors (33).
2. Elevator (40) according to claim 1, wherein the at least one heat shaft or the plurality of heat shafts (25) in the bottom wall part (12b) are formed in the form of a recess in the bottom wall part (12b).
3. Elevator according to one of the preceding claims, wherein a radial The direction of extension of the heat dissipation fins is vertical or substantially vertical.
4. Elevator installation according to one of the preceding claims, wherein the elevator drive is designed for passive, in particular exclusively passive, dissipation of heat generated in the electronic unit (7) by means of the heat dissipation fins (24).
5. Elevator (40) according to one of the preceding claims, wherein the heat dissipation fins (24) of the outer wall (12) comprise upper heat dissipation fins (24b) and lower heat dissipation fins (24a), channels extending between the heat dissipation fins (24), a convection barrier (40a) being arranged between the upper heat dissipation fins (24a) and the lower heat dissipation fins (24b) such that a flow of air in the channels between the lower heat dissipation fins (24a) and the upper heat dissipation fins (24b) is restricted or prevented.
6. Elevator (40) according to claim 5, wherein the convection barrier (40a) is formed by an axially outwardly shaped part of the outer wall (12) and wherein this shaped part extends perpendicular to the outer wall (12), wherein the convection barrier (40a) ends in the plane of the ends of the heat dissipation fins (24).
7. Elevator (40) according to one of the preceding claims, additionally comprising a further heat shaft or a plurality of further heat shafts (25b) which are arranged in an upper part of the outer wall (12) opposite electronic circuit components (32) of a safety part (38b) of the electronic unit (7).
8. Elevator (40) according to one of the preceding claims, wherein the electronic unit (7) comprises a power part (38a) which has the power transistors (33) and a safety part (38b) which has electronic circuit components including elevator drive control components.
9. Elevator drive (40) according to claim 8, wherein the power part and the safety part are thermally separated from each other.
10. Elevator (40) according to one of the preceding claims, wherein the inner wall (14) of the electronics housing part (2b) comprises a support cylinder of a bearing (16), wherein the support cylinder (16) protrudes axially from the bottom wall part (14b) of the inner wall and forms a support surface of the bearing (26), wherein the support cylinder (16) is designed to receive an outer ring of the bearing (5b) coupled to the rotor shaft (18) of the rotor (4).
11. Elevator (40) according to claim 10, wherein the bottom wall part (14b) and the support cylinder of the bearing (16) are designed to form an air circulation barrier between an inner side of the stator housing part (2a) and an inner side of the electronics housing part (2b), wherein the air circulation barrier restricts or prevents circulation of air between the stator (3) and the electronics unit (7).
12. Elevator (40) according to one of the preceding claims, wherein the support cylinder of the bearing (16) is connected to the bottom wall part (14b) of the inner wall by radial stiffening ribs (27).
13. Elevator (40) according to one of the preceding claims, wherein the rotor (4) comprises a rotor shaft (18) extending between an electronics end (20) and a drive end (29) of the drive (29), a rotation sensor (30) attached to the rotor at the electronics end (20), which is opposite a rotation sensor (30) of complementary design and attached to the electronics.
14. Elevator (40) according to one of the preceding claims, wherein the stator housing part (2a) has heat dissipation fins (23) extending from a tubular base wall in which the stator is mounted and extending into edges and axially along the tubular base wall, wherein at least the edges of the heat dissipation fins (23) in the lower part of the housing (2) are designed such that they extend in a plane (P), so that the elevator drive (1) can be stably set up on a flat surface.
15. Elevator (40) according to one of the preceding claims, wherein one or more of the heat shaft(s) (25) are arranged such that they are mounted against the circuit board (8) of the electronics unit (7).
16. Elevator (40) according to one of the preceding claims, further comprising - a second counterweight (43) arranged in the elevator shaft (41), - a second elevator drive (1) with a traction section (18b); and a second support means (44) which is coupled to the elevator car (42) and the second counterweight (43), and which second support means (44) extends over the traction section (18b) of the second elevator drive (1) such that the second support means (44) is movable by means of the second elevator drive (1), so that the elevator car (42) and the second counterweight (43) can be displaced vertically by operating the elevator drive (1).
17. Elevator (40) according to claim 16, wherein the elevator drive (1) is a master drive and / or is configured to operate in a master mode, and wherein the further Elevator drive (1) is a slave drive and / or is configured to operate in a slave mode.