ELEVATOR DRIVE AND ELEVATOR SYSTEM

Description

[0001] The present invention relates to an elevator drive and an elevator system comprising at least two of the elevator drives.

[0002] In a conventional elevator system for transporting one or more loads, such as people or goods, across one, two, or more floors, a car is located in the elevator shaft to hold the load(s). A counterweight, also located in the shaft, is connected to the car via one, two, or more load-bearing elements, such as ropes or belts. An elevator drive for vertically moving the car is coupled to a traction sheave over which the load-bearing element(s) run, allowing the car and counterweight to be moved vertically by operating the elevator drive. A brake is also typically provided, enabling the car and / or counterweights to be slowed down and / or locked in place.

[0003] IT BO20 110 408 A1 discloses a drive unit for an elevator or freight elevator, comprising a support body anchorable to a support bracket with a base part provided with means for coupling to the bracket, a rotary drive having a stator attached to the support body and a rotor pivotably connected to the stator to rotate about its own axis of rotation, essentially horizontally in use, a pulley connected to the rotor which rotates and moves a corresponding rope to raise or lower an elevator car, and a brake connected to the pulley which can be actuated to stop its rotation. This drive is a magnetic reluctance electric motor.

[0004] The elevator drive, particularly in large elevator systems, is conventionally located in a space above the elevator shaft, with the shaft ceiling having openings for the suspension components. Due to the generally high nominal payloads of such elevators, large, powerful elevator drives are required, capable of moving the car and counterweights vertically without difficulty, even under full load. Such a powerful elevator drive typically has a very high weight. Consequently, the ratio of the drive's weight to the nominal payload is correspondingly high. Examples of typical ratios include: 128kg / 450kg=0.28; with a lift drive weight of 128kg (excluding inverter) and a nominal payload of 450kg; 135kg-145kg / 680kg=0.19-0.21; with a lift drive weight of 135kg to 145kg (excluding inverter) and a nominal payload of 680kg; 175kg-185kg / 800kg=0.19-0.23; with a lift drive weight of 175kg to 185kg (excluding inverter) and a nominal payload of 800kg; 209kg-228kg / 1360kg=0.15-0.16; with a lift drive weight of 209kg to 228kg and a nominal payload of 1360kg.

[0005] Conventional elevator drives are therefore quite heavy. Such heavy elevator drives are difficult to handle during installation, generally requiring several people and / or tools or machinery for their placement. Furthermore, the structural integrity, and especially the floors in the spaces above the elevator shafts, must be designed to withstand these weights. These spaces already require considerable room, and suitable floors are additionally thick.

[0006] Therefore, there may be a need for an elevator drive for an elevator system that is easy to handle and install, and / or can be housed in a space-saving manner. Furthermore, there may be a need for a suitably equipped elevator system.

[0007] Such a need can be met by the subject matter of the independent claim. Advantageous embodiments are defined in the dependent claims and in the following description as well as the accompanying figures.

[0008] A first aspect of the invention relates to an elevator drive for an elevator system.

[0009] The elevator drive has an electric motor which has a housing designed as a permanent magnet synchronous motor and which has a motor shaft which has a drive zone on an axial section of its outer surface outside the housing for coupling with at least one load-bearing element of the elevator system.

[0010] In a preferred embodiment of the elevator drive, the ratio of the weight of the elevator drive to the nominal payload for which the elevator drive is designed is less than 0.2.

[0011] The ratio can be, for example, less than 0.15, less than 0.12, or 0.11. Examples of possible ratios in accordance with the present invention include: (28kg-32kg) / (630kg / 2)=0.09-0.1; with a weight of the elevator drive of 28kg to 32kg (including inverter) and a nominal payload of 630kg; (25-27kg) / (480kg / 2)= 0.1-0.11; with a weight of the elevator drive of 25kg to 27kg (including inverter) and a nominal payload of 480kg.

[0012] Thus, an elevator drive according to the invention typically has a dead weight of less than 50 kg, preferably between 10 kg and 40 kg, for example, 25 kg to 32 kg. The weight of the electric motor can constitute at least 60%, preferably at least 80%, and particularly at least 90% of the total dead weight of the elevator drive. The weight of the elevator drive, as described above and below, can include the weight of an inverter for controlling the electric motor. In a preferred embodiment, the inverter is designed as part of the elevator drive, i.e., attached to the electric motor, for example. A nominal payload for which the elevator drive is designed specifies a maximum weight force that can or may be shifted by means of this elevator drive due to its design and / or approval.In elevator systems with only one drive unit, the nominal payload for which the drive unit is designed can correspond to the nominal payload of the elevator system. In elevator systems with multiple drives, the nominal payload for which the drive unit is designed can correspond to the nominal payload of the elevator system divided by the number of drives. For example, in an elevator system with two identical drives, the nominal payload for which the drive unit is designed can correspond to half the nominal payload of the elevator system. The nominal payload correlates, among other things, with the weight of the counterweight(s) and the weight of the elevator car. The required characteristics of the drive unit for a given nominal payload are defined by various standards and regulations, such as the European standard EN 81.The nominal payload of an elevator system with an elevator drive described herein can typically be in the range of 50 kg to 5 t, preferably 100 kg to 2 t, and in particular between 300 kg and 1 t.

[0013] The nominal payload for which the elevator is designed can also be understood as the nominal payload for which the motor is designed. Such a nominal payload includes not only the elevator's own load capacity but also the elevator's own weight acting on the drive system. In this case, the nominal payload is therefore the nominal load of the elevator drive.

[0014] Small, powerful electric motors have already been developed in other technological fields, for example, for use in motor vehicles. However, for various reasons and prejudices, they have not yet been used as elevator drives in elevator systems. For example, the resulting complexity in controlling multiple small drives was a barrier to their use.

[0015] The elevator drive described herein is easy to handle, especially by a single person. In particular, the elevator drive can be so small and light that, in compliance with applicable labor laws, it can be handled and, in particular, lifted by a single technician during installation or maintenance.

[0016] Furthermore, such an elevator drive can be designed to be compact, thus requiring minimal space. This allows the elevator drive to be mounted, for example, in the elevator shaft on the ceiling of the shaft or on a self-supporting structure located within the shaft, which is intended, for example, to guide the car and / or the counterweights. A separate machine room above the elevator shaft for housing the elevator drive is not necessary. For the vertical movement of the car and the counterweights, two of the elevator drives are preferably arranged, as explained in more detail below.

[0017] A second aspect of the invention relates to an elevator system comprising: an elevator shaft; a car arranged in the elevator shaft; at least two counterweights arranged in the elevator shaft, each coupled to the car via a load-bearing element; at least two of the elevator drives according to the first aspect of the invention, wherein the load-bearing elements extend over each of the drive zones of the elevator drives such that the load-bearing elements are movable by means of the elevator drives, allowing the car and the counterweights to be moved vertically by operating the elevator drives; and a brake, in particular a car brake, by means of which the car and / or the counterweights can be braked and / or locked. Since the elevator system described above and below comprises two elevator drives, it is particularly advantageous to provide a car brake.

[0018] Using two elevator drives to move a car allows the load to be distributed between the two drives, so that each drive only has to move half the load. This makes it possible to design each drive to be particularly small and / or lightweight. Such a drive is very easy to operate, especially by a single person. Furthermore, it can be designed to be extremely compact, requiring very little space. This allows the drive to be mounted, for example, on the ceiling of the elevator shaft. A separate room above the shaft for housing the drive is not necessary.

[0019] The elevator system can be, for example, a freight or passenger elevator. The two counterweights are preferably of equal weight. The suspension components can each consist of one, two, or more ropes and / or belts.

[0020] Features of the elevator drive according to an embodiment of the first aspect of the invention may also be features of the elevator system according to an embodiment of the second aspect of the invention within the scope of protection of the attached claim, and vice versa.

[0021] According to one embodiment, the outer diameter of the drive zone corresponds to the outer diameter of the motor shaft. Alternatively, the ratio of the outer diameter of the drive zone to the outer diameter of the motor shaft can be less than 1.4, preferably less than 1.35, and particularly less than 1.25. In other words, the outer diameter of the drive zone can essentially correspond to the outer diameter of the motor shaft. In particular, the elevator drive described herein preferably eliminates the need for a conventional traction sheave with a large outer diameter. This contributes to a particularly simple, compact, and lightweight design for the elevator drive. Unlike conventional elevator drives, the elevator drive according to the invention is designed so that the traction sheave is not removable. This allows the elevator drive to be built even more compactly and to save further weight.The costs incurred in the event of a traction sheave defect are comparatively small, since the elevator drive is otherwise compact and, in particular, several, preferably two, elevator drives are used per elevator system.

[0022] According to the claim, the elevator drive further comprises: a printed circuit board (PCB) arranged on the side of the electric motor facing away from the drive zone, perpendicular to the motor shaft, and an inverter for electrically controlling the electric motor, which is arranged on the PCB and electrically connected to the electric motor. This contributes to a particularly simple, compact, and lightweight design for the elevator drive. Furthermore, arranging the PCB with the inverter on the side of the electric motor facing away from the drive zone provides thermal separation between the electric motor and the inverter. This contributes to particularly good thermal management. The PCB can, for example, be a printed circuit board (PCB). Generally, for the purposes of this description, a PCB is understood to be any carrier of one or more electronic components and / or electrical conductors.The circuit board can, for example, implement a control system for the electric motor. The inverter can supply power to the electric motor. For instance, an elevator system might include a converter to power the elevator drive. The converter can consist of a grid-side rectifier (passive or active), a DC bus with an energy storage device, such as a battery and / or a capacitor, and an electric motor-side inverter (also called a power inverter). The inverter is electrically connected to the DC bus and generates a voltage, variable in amplitude and / or frequency, from the DC bus voltage to control the electric motor.

[0023] According to one embodiment, the circuit board is mechanically connected to the electric motor on a first side, and a heat sink for the elevator drive is arranged on a second side of the circuit board, facing away from the electric motor. This heat sink is in thermal contact with the inverter and has cooling fins arranged in a zigzag shape. The thermal contact is achieved, for example, through direct physical contact between the inverter and the heat sink. Overall, the cooling of the elevator drive can be designed such that, at least on temperature-sensitive components such as an STO module (STO: safety torque off) or the inverter's semiconductor switches, no excessive temperatures of, for example, more than 80°C or, in some cases, more than 90°C occur during the heat-generating operation of the elevator drive.

[0024] The electric motor and / or the inverter can, for example, be cooled exclusively by passive cooling. Such purely passive cooling is made possible, in particular, by the fact that the entire elevator system has two elevator drives, meaning that each individual drive needs to be less powerful and therefore generates less waste heat. The heat sink with its zigzag-shaped first cooling fins enables particularly efficient dissipation of the heat generated during inverter operation. The heat sink thus contributes to excellent thermal management. Furthermore, the zigzag shape is particularly robust against impacts or other external mechanical stresses.

[0025] According to one embodiment, the circuit board includes a Safe Torque Off (STO) module, which interrupts the power supply to the electric motor, preventing it from generating torque. The Safe Torque Off module can also be referred to as an STO module. In the event of an emergency or failure, the STO module can help prevent property damage and / or personal injury by de-energizing the inverter and thus stopping torque generation. In an elevator system with two elevator drives, each drive can have its own safety module. This safety module can be implemented, for example, on or with the circuit board described above, thereby reducing installation space and / or costs.

[0026] According to one embodiment, the circuit board includes an encoder comprising a magnet and a magnetic field sensor. The magnet can, for example, be positioned on the shaft of the electric motor, with the magnetic sensor arranged on the circuit board in such a way that it can effectively detect the magnet's magnetic field. The encoder thus enables the rotational speed of the electric motor to be detected in a particularly simple and compact manner.

[0027] According to one embodiment, the circuit board has on its first side a first electrical connection for connecting to a power source and a second electrical connection, which is electrically connected to the electric motor, the safety module, and / or the encoder for receiving and / or transmitting electrical signals. Since the electrical connections are located on the first side of the circuit board facing the electric motor, they are also oriented towards the motor. This means that when plugging in the corresponding connectors, no additional space is required for the connectors outside the area of ​​the elevator drive, so to speak "behind" the drive, as the connectors are located in a space between the circuit board and the electric motor. Furthermore, the connections are easily accessible to a technician, for example, during the installation or maintenance of the elevator system.The connector is therefore located on the side of the circuit board facing the motor shaft.

[0028] According to one embodiment, the inverter is configured for an operating voltage of less than 60V. The operating voltage can, for example, be less than 48V. Advantageously, the operating voltage is above 24V, preferably above 36V, and particularly preferably above 42V. This operating voltage refers to the operating voltage of the inverter and not the operating voltage of the electric motor. The use of lower operating voltages can increase the safety of the elevator system. Furthermore, an elevator drive, especially one designed with its inverter for a low operating voltage, can optionally also be operated with power sources such as commercially available battery packs, with such power sources serving, in particular, as an emergency power source in the event of a failure of the regular power grid. Such power sources can also be used in conjunction with one or more other power sources.For example, the battery pack power source can serve as a supplementary power source alongside another power source designed as a mains connection. The battery pack power source can thus help to cover peak loads, thereby reducing the power requirements of the mains connection.

[0029] According to one embodiment, second cooling fins are arranged on an outer surface of the housing. These fins extend in a direction parallel to an axis of the motor shaft and are angled at at least one of their axial ends, with an axial section of the housing facing the drive zone being free of the second cooling fins. The second cooling fins contribute to particularly efficient cooling of the electric motor. In particular, the provision of the second cooling fins can help to ensure that purely passive cooling is sufficient for the elevator drive.

[0030] According to one embodiment, the housing for connection to a suspension of the elevator system has a mechanical interface on a first side of the housing, designed such that the elevator drive can be placed on this interface. Alternatively or additionally, the housing has a support surface on a second side facing away from the first side of the housing, designed such that the elevator drive can be placed on this support surface. Mechanical components or areas of the elevator drive that form the mechanical interface or the support surface can preferably be designed and / or dimensioned such that they can bear the weight of the elevator drive without damage. The support surface can, for example, be formed by the end faces of the second cooling fins facing away from the motor shaft.Using the mechanical interface as a storage surface, and / or the storage surface itself, facilitates the easy storage of the elevator drive. This simplifies transport, handling, and installation for a technician who needs to secure the elevator drive in the elevator shaft.

[0031] According to one embodiment, the drive zone has an uneven profile. In other words, the drive zone can be formed by a profiled surface. The profile can, for example, be V-shaped and / or have one, two, or more V-shaped indentations. The unevenness of the profile, particularly the V-shape, increases the area of ​​the drive zone and thus the contact area between the motor shaft and the drive zone. This contributes to particularly high static and frictional forces between the load-bearing element and the drive zone. This enables particularly safe and precise vertical movement of the elevator car by means of the elevator drive. In particular, the high static and frictional forces can lead to good traction between the drive zone and the load-bearing element, even though the outer diameter of the drive zone in the elevator drive described herein can be relatively small.

[0032] According to one embodiment of the elevator system, it includes a control unit. The elevator drives can be configured to form a single drive unit, in particular in a master-slave configuration. The control unit controls the drive unit as if they were a single drive. In a preferred embodiment, the elevator drives are configured to rotate in opposite directions.

[0033] In the preceding and following text, a drive unit is to be understood as a functional unit in which several (for example, two) elevator drives are combined, so that they can be controlled by a control unit as a single drive. For example, the inverters of two drives can be configured such that one of the inverters can be assigned the function of master. This inverter (master) handles the communication with the control unit. That is, the control unit specifies a setpoint value, for example, a target speed, to this inverter. The master inverter, in turn, specifies a setpoint value, for example, a target torque, to the second inverter (slave). In one embodiment, the two inverters can be housed in a single enclosure.

[0034] This allows for simple synchronous control of the two elevator drives, thus making it possible to easily achieve the elevator drive using two comparatively smaller elevator drives.

[0035] In one embodiment, the elevator drives can be arranged in a supported manner. In particular, the elevator drives can be supported on the guide rails in the area of ​​the shaft head of the elevator system.

[0036] According to one embodiment of the elevator system, the elevator drives are suspended from a ceiling of the elevator shaft.

[0037] The area in the elevator shaft that adjoins the ceiling can also be called the shaft head. This allows the elevator drives to be suspended / supported within the shaft head. This eliminates the need for a separate room, particularly a machine room, above the elevator shaft to house the elevator drives. This contributes to a particularly compact design of the entire elevator system.

[0038] According to one embodiment of the elevator system, at least one cable for connection to the first or second electrical terminal of the circuit board is routed from one side of the housing facing the drive zone, across the housing, to the corresponding first or second electrical terminal. This allows for a particularly space-saving arrangement of the elevator drives, as no additional space outside the area of ​​the elevator drives is required for arranging the cables. Instead, the cables are routed through an area between the electric motor, the circuit board, and the ceiling of the elevator shaft.

[0039] Optionally, the elevator system can include a control device for controlling the elevator drives. The control device can include a processor configured to control the elevator drives so that they move the corresponding load-bearing elements, and thus the counterweights and the car, synchronously. The control device can comprise hardware and / or software modules. In addition to the processor, the control device can include memory and data communication interfaces for data communication with peripheral devices.

[0040] Embodiments of the invention are described below with reference to the accompanying drawings, whereby neither the drawings nor the description are to be interpreted as limiting the invention. Fig. 1 shows an elevator system according to an embodiment of the invention. Fig. 2 shows an elevator drive according to an embodiment of the invention. Fig. 3shows a detailed view of part of an exemplary embodiment of a drive zone of the elevator drive according to Figure 2 . Fig. 4 shows a heat sink according to an embodiment of the invention. Fig. 5 shows an exemplary embodiment of two electrical connections of an inverter of the elevator drive according to Figure 2 .

[0041] The figures are merely schematic and not to scale. Identical reference symbols in the different figures denote identical or equivalent features.

[0042] Fig. 1Figure 1 shows an embodiment of an elevator system 20, such as a passenger or freight elevator. The elevator system 20 comprises an elevator shaft 22, a car 24, two counterweights 26, two elevator drives 30, each with a motor shaft 32, suspension elements 28, and a brake (not shown). The elevator drives 30 are mounted in the area of ​​the ceiling 34 of the elevator shaft 22, in particular supported on a guide rail of the elevator (not shown) or suspended from the ceiling 34 of the elevator shaft 22. An area in the elevator shaft 22 that adjoins the ceiling 34 can also be referred to as the shaft head. Thus, the elevator drives 30 are supported / suspended in the shaft head. The suspension elements 28 can, for example, comprise one or more ropes or belts.

[0043] The car 24 is arranged to be vertically displaceable in the elevator shaft 22. The counterweights 26 are each connected to the car 24 via the corresponding suspension elements 28. The motor shaft 32 rotates when the electric motor 30 is operated. The suspension element 28 runs over a drive zone 50 (see Figure 2The car 24 and the counterweight 26 are mounted on the motor shaft 32 and are movable by means of the drive zone 50, so that the car 24 and the counterweight 26 can be moved vertically by operating the electric motor 30 in conjunction with the suspension elements 28. In particular, the car 24 can be moved vertically from a first floor with a first access 36 to a second floor with a second access 38 or vice versa. Optionally, the elevator shaft 22 can extend over more than two floors with corresponding access points. The counterweights 26 are preferably of equal weight. The brake enables the car 24 to be slowed down and / or locked in place. Alternatively or additionally, a further brake can be arranged for slowing down and / or locking the counterweight 26.

[0044] A control device (not shown) for controlling the elevator drive 30 and / or the brake can be communicatively coupled to the elevator drive 30 or the brake, respectively. The two elevator drives 30 can be configured in a master-slave configuration. For example, the two elevator drives 30 can be torque-controlled and synchronized. In particular, the two elevator drives 30 are controlled and / or synchronized to each other such that they align the car 24 vertically and displace the counterweights 26 vertically in a uniform manner relative to each other.

[0045] Fig. 2 Figure 1 shows an elevator drive 30 according to an embodiment of the invention. The elevator drive 30 corresponds to the one described in relation to Figure 1 The elevator drive 30 was explained. Therefore, the following discussion will only address those features of the elevator drive 30 that have not yet been discussed in relation to Figure 1The elevator drive 30 comprises an electric motor 40, which has a housing 41. The electric motor 40 is designed as a permanent magnet synchronous motor and has a motor shaft 32. The motor shaft 32 has, on an axial section of its outer surface outside the housing 41, the drive zone 50 for coupling with at least one of the support elements 28. The outer diameter of the drive zone 50 corresponds essentially to the outer diameter of the motor shaft 32. Alternatively, the motor shaft 32 and the drive zone 50 can be designed such that the ratio of the outer diameter of the drive zone 50 to the outer diameter of the motor shaft 32 is less than 1.4, preferably less than 1.35, and particularly less than 1.25. In other words, the outer diameter of the drive zone 50 can essentially correspond to the outer diameter of the motor shaft 32.A ratio of the weight of the elevator drive 30 to half the nominal payload of the elevator system 20 is less than 0.2, for example less than 0.15, for example less than 0.12, for example 0.11.

[0046] On the side of the electric motor 40 facing away from the drive zone 50, a printed circuit board 42 (enclosed in a housing) is arranged. Specifically, the printed circuit board 42 is arranged perpendicular to the motor shaft 32 on the electric motor 40. The first side of the printed circuit board 42 faces the electric motor 40 and is mechanically connected to the electric motor via a housing that surrounds the printed circuit board. An inverter is located on the printed circuit board 42, which is electrically connected to the electric motor 40 and controls it via a DC bus with a voltage that is variable in amplitude and frequency to achieve a predetermined torque. The inverter can, for example, be configured for an operating voltage (input side) of less than 60 V, such as less than 48 V.

[0047] The inverter can include a safety module. This safety module can interrupt the power supply to the electric motor 40, preventing it from generating any further torque. The safety module (also called STO module) can be implemented, for example, as semiconductor switches or relays that can short-circuit the control inputs of the inverter's semiconductor switches. The circuit board 42, which contains the inverter and the STO module, can also include an encoder. For example, a magnetic field sensor is positioned on the circuit board 42 to detect the rotating magnetic field of a magnet attached to the motor shaft and rotating with it. The encoder thus allows the actual movement of the motor shaft to be measured.

[0048] The circuit board 42 can have a first electrical connection 52 and a second electrical connection 54 on its first side. The first electrical connection 52 is configured to connect the inverter to a power source. The second electrical connection 54 is electrically connected to the electric motor 40, the safety module, and / or the encoder for receiving and / or transmitting electrical signals. Since the two electrical connections 52 and 54 are located on the first side of the circuit board 42, they face the electric motor 40. This allows one, two, or more cables to be routed from one side of the housing 41, which faces the drive zone 50, across the housing 41 to the corresponding first or second electrical connection 52 or 54.This allows the cables to be routed in a space-saving manner through the area between the electric motor 40, the circuit board 42 and the ceiling 34 of the elevator shaft 22, thus keeping them short.

[0049] On a second side of the circuit board 42, facing away from the electric motor 40, a heat sink 44 is arranged, which is in thermal contact, for example in direct physical contact, with the inverter and / or STO module, i.e., the circuit board 42. The heat sink 44 can have first cooling fins 46 (see Figure 4The circuit board 42 (especially the inverter and / or the STO module) can be passively cooled by means of the heat sink 44. Due to the proximity of the heat sink 44 to the electric motor 40, the thermal load on the electric motor 40 is also reduced. In particular, the heat generated on the circuit board is dissipated on the second side (facing away from the machine), thus ensuring that this heat does not additionally heat the electric motor. This allows the elevator drive to be built compactly and yet be cooled exclusively by passive means.

[0050] Second cooling fins 48 can be arranged on an outer side of the housing 41. The second cooling fins 48 extend in a direction parallel to an axis 61 (see Figure 3) of the motor shaft 32. The second cooling fins 48 can be angled at at least one of their axial ends. An axial section of the housing 41 facing the drive zone 50 can be free of the second cooling fins. Optionally, the electric motor 40 can be passively cooled exclusively by means of the second cooling fins 48. Optionally, the electric motor 40 can be passively cooled exclusively by means of the heat sink 44 and the second cooling fins 48.

[0051] The housing 41 can be connected to a suspension of the elevator system 20 on a first side of the housing 41, in Figure 2 on the top of the housing 41, a mechanical interface 56 can be provided. Alternatively, the housing 41 can have a second side of the housing 41 facing away from the first side of the housing 41 (in Figure 2The housing 41) has a support surface 58 on its underside, designed so that the elevator drive 30 can be safely placed on it. The support surface 58 can, for example, be formed by the end faces of the second cooling fins 48 facing away from the motor shaft 32. Several of these end faces can be located in the same plane and together form the support surface 58. Furthermore, a lower part 57 of the interface 56 can be designed so that it also forms part of the support surface 58 when the elevator drive 30 is placed on the ground.

[0052] Fig. 3 shows a detailed view of part of an embodiment of the drive zone 50 of the elevator drive 30 according to Figure 2The drive zone 50 can have an uneven profile. The profile can, for example, be V-shaped and / or have one, two, or more V-shaped indentations. The V-shapes of the indentations can each have an opening angle 60° of, for example, 90°. The unevenness of the profile, in particular the V-shape, increases the area of ​​the drive zone 50 and thus the contact area between the motor shaft 32 and the drive zone 50. Due to the V-shaped profile, traction can be increased when driving a suitably complementary propellant.

[0053] Fig. 4Figure 44 shows the heat sink according to an embodiment of the invention. The heat sink 44 has first cooling fins 46. The first cooling fins 46 can have a zigzag shape. The first cooling fins can, for example, each have a height of 8 mm or more, for example over 10 mm, for example over 15 mm, and for example less than 30 mm. The heat sink 44 and / or, in particular, the first cooling fins 46 can, for example, be manufactured by means of an additive manufacturing process.

[0054] Fig. 5 Figure 1 shows an embodiment of the two electrical connections 52, 54 of the circuit board 42 of the elevator drive 30 according to Figure 2The first electrical terminal 52, configured to connect the inverter to an external power source (not shown), may, for example, have a negative contact 62 and / or a positive contact 64, where the negative contact 62 may also be referred to as the ground terminal. The second electrical terminal 54, configured, for example, to connect the inverter to the control device, may, for example, have a first CAN contact 66, a second CAN contact 68, an STO negative contact 70, and an STO positive contact 72.

Claims

1. Elevator drive (30) for an elevator system (20), the elevator drive (30) having: an electric motor (40) which has a housing (41) which is designed as a permanent magnet synchronous motor and which has a motor shaft (32) which has a drive zone (50) on an axial portion of its lateral surface outside the housing (41), for coupling to at least one suspension means of the elevator system (20), a printed circuit board (42) arranged perpendicular to the motor shaft (32) on the electric motor (40) on a side facing away from the drive zone (50), and an inverter for electrically controlling the electric is electrically connected to the electric motor (40), characterized in that the inverter is arranged on the printed circuit board (42)2. Elevator drive (30) according to claim 1, wherein a ratio of a weight of the elevator drive (30) to a nominal payload for which the elevator drive (30) is designed is less than 0.2.

3. Elevator drive (30) according to any of the preceding claims, wherein an outside diameter of the drive zone (50) corresponds to an outside diameter of the motor shaft (32); or a ratio of the outside diameter of the drive zone (50) to the outside diameter of the motor shaft (32) is less than 1.4.

4. Elevator drive (30) according to one of the preceding claims, wherein the circuit board (42) is mechanically connected to the electric motor (40) on a first side of the circuit board (42), and wherein a heat sink (44) of the elevator drive (30) is arranged on a second side of the circuit board (42) facing away from the electric motor (40), which heat sink is in thermal contact with the inverter and comprises first cooling ribs (46), which in particular have a zigzag shape.

5. Elevator drive (30) according to one of the preceding claims, wherein the circuit board (42) has a Safe Torque OFF module (STO module) by means of which an energy supply of the electric motor (40) can be interrupted, so that the electric motor (40) can no longer generate any torque.

6. Elevator drive (30) according to one of the preceding claims, wherein the circuit board (42) has an encoder which in particular has a magnet and a magnetic field sensor.

7. Elevator drive (30) according to any of claims 5 or 6, wherein the circuit board (42) has, on its first side, a first electrical connection (52) for connection to an energy source and a second electrical connection (54) which is electrically connected to the circuit board, in particular to the inverter, the electric motor (40), the safety module, and / or the encoder, for receiving and / or transmitting electrical signals.

8. Elevator drive (30) according to one of the preceding claims, wherein the inverter is configured for an operating voltage of less than 60 V.

9. Elevator drive (30) according to any of the preceding claims, wherein second cooling ribs (48) are arranged on an outer side of the housing (41), which extend in the direction in parallel with an axis of the motor shaft (32) and which are in particular angled at at least one of their axial ends, and wherein an axial portion of the housing (41) facing the drive zone (50) is free of the second cooling ribs (48).

10. Elevator drive (30) according to any of the preceding claims, wherein the housing (41) has a mechanical interface (56, 57) for connection to a suspension of the elevator system (20), on a first side of the housing (41), which mechanical interface is designed such that the elevator drive (30) can be placed on the mechanical interface (56, 57), and / or the housing (41) has a deposition surface (58) on a second side of the housing (41) facing away from the first side of the housing (41), which deposition surface is designed such that the elevator drive (30) can be placed on the deposition surface (58).

11. Elevator drive (30) according to any of the preceding claims, wherein the drive zone (50) has an uneven profile.

12. Elevator system (20), comprising: an elevator shaft (22); an elevator car (24) which is arranged in the elevator shaft (22); at least two counterweights (26) which are arranged in the elevator shaft (22) and are each coupled to the elevator car (24) via a suspension means (28); at least two elevator drives (30) according to any of the preceding claims, wherein the suspension means (28) extend over one of the drive zones (50) of the elevator drives (30) in each case, in such a way that the suspension means (28) can be moved by means of the elevator drives (30), such that the elevator car (24) and the counterweights (26) can be displaced vertically by operation of the elevator drives (30); and a brake, in particular a car brake, by means of which the elevator car (24) and / or the counterweights (26) can be braked and / or locked.

13. Elevator system (20) according to claim 12, wherein said elevator system comprises a control unit for controlling the elevator drives, wherein the elevator drives (30) are designed such that they form a drive unit, wherein for this purpose the elevator drives (30) are designed in particular in a master-slave configuration, wherein the control unit controls the drive unit as though it were a single drive, wherein the elevator drives (30) rotate in particular in the opposite direction.

14. Elevator system (20) according to any of claims 12 or 13, wherein the elevator drives (30) are arranged in a shaft head, in particular are supported on or suspended from the guide rails.

15. Elevator system (20) according to any of claims 12 to 14, wherein at least one cable for connection to the first or second electrical connection (52, 54) of the circuit board (42) is guided from one side of the housing (41), which faces the drive zone (50), via the housing (41), to the corresponding first or second electrical connection (52, 54).