Hoist and elevator

Abstract

The traction machine comprises a machine base, a rotating shaft, a rotor, a stator, a traction wheel and a brake, the rotating shaft is installed on the machine base through at least two bearings, and at least part of the rotating shaft extends out of the machine base; the rotor comprises a connecting part in transmission connection with the part, extending out of the base, of the rotating shaft, an extension part extending from the outer edge of the connecting part to the periphery and a magnet yoke part extending from the outer edge of the extension part in the direction parallel to the axial direction of the rotating shaft and close to the bearing, and the stator is installed on the side, facing the extension part, of the base and located on the inner side of the magnet yoke part; according to the technical scheme, the rotor and the traction wheel can be independent from each other, so that the dead weight of the rotor is reduced, the rotation speed of the rotor is increased, and the service life of the rotor is prolonged. Furthermore, the gravity center shift degree of the rotor is small when the rotor rotates, so that the stability of the rotor is better when the rotor moves at a high speed, and the stability of the traction machine during working is improved.

Description

Technical Field

[0001] This application relates to the field of elevator technology, and more particularly to a traction machine and an elevator. Background Technology

[0002] A traction machine is an elevator traction power unit that connects and pulls the elevator car through steel wire ropes. It is the power source that enables the car to move up and down. Existing traction machines generally include a base and a traction sheave, main shaft, rotor, and stator mounted on the base. Among them, according to the different matching structures of the rotor and stator, they can generally be divided into traction machines with internal rotor structure and traction machines with external rotor structure.

[0003] To improve heat dissipation and torque, external rotor traction machines are typically used. However, in related technologies, the traction sheave is directly mounted on the outer peripheral wall of the rotor. This requires the rotor to be bent to form a part that interacts with the stator, and this part needs to be offset from the connection with the main shaft towards the stator. In this case, the rotor has a long extension path, a large self-weight, and a large center of gravity offset when rotating, resulting in poor stability at high speeds and thus poor stability of the traction machine during operation. Summary of the Invention

[0004] This application provides a traction machine and an elevator, aiming to improve the problem of poor stability of the traction machine during operation.

[0005] To address the aforementioned technical problems, embodiments of this application provide a traction machine, comprising:

[0006] Base;

[0007] A rotating shaft is mounted to the base via at least two bearings and extends at least partially out of the base;

[0008] The rotor includes a connecting portion that is drively connected to the portion of the rotating shaft that extends out of the base, an extension portion that extends outward from the outer edge of the connecting portion, and a magnetic yoke portion that extends from the outer edge of the extension portion along an axial direction parallel to the rotating shaft and toward the bearing.

[0009] The stator is mounted on the side of the base facing the extension and is located inside the magnetic yoke.

[0010] A traction sheave, driven by the shaft, and located between two adjacent bearings; and

[0011] The brake is connected to one axial end of the rotating shaft.

[0012] In some of these embodiments, the brake is located on the side of the housing opposite to the stator.

[0013] In some embodiments, the base includes:

[0014] Support frame with receiving cavity;

[0015] A brake disc end cap, having a first mounting hole, is mounted on one axial end of the support frame on the rotating shaft; and

[0016] The iron core base has a second mounting hole and is mounted on the other end of the support frame in the axial direction of the rotating shaft;

[0017] The brake is mounted on the surface of the brake disc opposite to the accommodating cavity, the stator core is mounted on the surface of the core seat opposite to the accommodating cavity, the traction sheave is located inside the accommodating cavity, and the bearing is installed in both the first mounting hole and the second mounting hole.

[0018] In some embodiments, one of the core seat and the brake disc end cap is integrally formed with the support frame.

[0019] In some embodiments, the base is provided with an annular mounting portion, the stator is sleeved on the outer peripheral wall of the annular mounting portion, and the rotating shaft is at least partially located inside the annular mounting portion.

[0020] In some embodiments, the inner wall surface of the annular mounting portion is provided with a plurality of reinforcing ribs, which are spaced apart circumferentially along the axis of rotation.

[0021] In some embodiments, the outer peripheral wall of the base is provided with clearance holes for steel ropes to extend into the base and engage with the traction sheave;

[0022] The traction sheave is provided with a plurality of first through holes along the axial direction of the shaft, and the plurality of first through holes are arranged at intervals along the circumference of the traction sheave.

[0023] In some embodiments, the traction sheave is provided with at least one reinforcing rib between each of two adjacent clearance holes.

[0024] In some embodiments, the extension portion is provided with heat dissipation holes, and the surface of the base facing the extension portion is provided with a second through hole.

[0025] In some of these embodiments, it also includes:

[0026] A protective cover is installed on the base, and the protective cover and the base together form a protective cavity, in which the rotor is located.

[0027] In some embodiments, the inner surface of the base is further provided with a first limiting protrusion, which abuts against the surface of at least one of the bearings opposite to the traction sheave.

[0028] In some embodiments, the outer peripheral wall of the shaft is provided with a second limiting protrusion, which abuts against at least one of the bearing surfaces near the traction sheave.

[0029] In some embodiments, the outer peripheral wall of the shaft is provided with a third limiting protrusion, which abuts against the surface of the connecting portion near the traction sheave.

[0030] This application also provides an elevator, including:

[0031] The car;

[0032] steel rope; and

[0033] In the aforementioned traction machine, the traction sheave is connected to the car via the steel rope to drive the car to rise and fall.

[0034] The traction machine in this embodiment can make the rotor and traction wheel independent of each other, thereby reducing the rotor's weight and making the rotor's center of gravity offset smaller when the rotor rotates, resulting in better stability of the rotor when moving at high speed, thus improving the stability of the traction machine during operation. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of the traction machine provided in the embodiments of this application;

[0037] Figure 2 This is an exploded view of the traction machine in the embodiments of this application;

[0038] Figure 3 This is a cross-sectional view of the traction machine in an embodiment of this application;

[0039] Figure 4 This is a schematic diagram of the base structure in an embodiment of this application;

[0040] Figure 5 This is a cross-sectional view of the base in an embodiment of this application;

[0041] Figure 6 This is a schematic diagram of the traction sheave structure in an embodiment of this application;

[0042] Figure 7This is a schematic diagram of the structure of the rotating shaft in an embodiment of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Traction machine; 11. Base; 111. Support frame; 1111. Receiving cavity; 112. Brake disc end cover; 1121. First mounting hole; 113. Core seat; 1131. Second mounting hole; 114. Annular mounting part; 1141. Reinforcing rib; 115. Clearance hole; 116. Second through hole; 117. First limiting protrusion; 12. Rotating shaft; 121. Second limiting protrusion; 122. Third limiting protrusion; 13. Rotor; 131. Connecting part; 132. Extension part; 1321. Heat dissipation hole; 133. Magnetic yoke; 14. Stator; 15. Traction sheave; 151. First through hole; 152. Reinforcing rib; 16. Brake; 17. Bearing; 18. Protective cover; 19. Protective cavity. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0046] A traction machine is an elevator traction power unit that connects and pulls the elevator car through steel wire ropes. It is the power source that enables the car to move up and down. Existing traction machines generally include a base and a traction sheave, main shaft, rotor, and stator mounted on the base. Among them, according to the different matching structures of the rotor and stator, they can generally be divided into traction machines with internal rotor structure and traction machines with external rotor structure.

[0047] To improve heat dissipation and torque, external rotor traction machines are typically used. However, in related technologies, the traction sheave is directly mounted on the outer peripheral wall of the rotor. This requires the rotor to be bent to form a part that interacts with the stator, and this part needs to be offset from the connection with the main shaft towards the stator. In this case, the rotor has a long extension path, a large self-weight, and a large center of gravity offset when rotating, resulting in poor stability at high speeds and thus poor stability of the traction machine during operation.

[0048] To resolve the above issues, please refer to [link / reference]. Figure 1 This application provides a traction machine 1 and an elevator. The elevator includes a car, steel ropes and a traction machine 1. The traction sheave 15 is connected to the car via the steel ropes to drive the car to move up and down.

[0049] Please see Figure 2The traction machine 1 includes a base 11, a rotating shaft 12, a rotor 13, a stator 14, a traction sheave 15, and a brake 16. The base 11 is used to support the rotating shaft 12, the rotor 13, the stator 14, the traction sheave 15, and the brake 16. When the traction sheave 15 is connected to the car via a wire rope, the base 11 also needs to support the weight of the wire rope and the car. Therefore, the base 11 is preferably made of a material with high strength, good toughness, fatigue resistance, and wear resistance, such as cast iron, steel, aluminum alloy, or engineering plastics.

[0050] Please see Figure 3 The rotating shaft 12 is mounted on the base 11 via at least two bearings 17 and extends at least partially out of the base 11. It is understood that the rotating shaft 12 can rotate relative to the base 11 via the bearings 17, and all bearings 17 are concentrically arranged. The rotating shaft 12 can be mounted on the base 11 via two bearings 17, or via three bearings 17, or via more bearings 17. No specific limitation is made here.

[0051] It should be noted that the rotating shaft 12 extends at least partially out of the machine base 11. This can be either one end of the rotating shaft 12 in the axial direction passing through the machine base 11, or both ends of the rotating shaft 12 in the axial direction passing through the corresponding rotating shaft 12 and extending out of the machine base 11. No specific limitation is made here.

[0052] Please see Figure 3 The rotor 13 includes a connecting portion 131, an extension portion 132, and a magnetic yoke portion 133. The connecting portion 131 is connected to the portion of the rotating shaft 12 extending out of the base 11, and when the rotor 13 rotates, it can drive the rotating shaft 12 to rotate together through the connecting portion 131. The extension portion 132 is formed by expanding outward from the outer edge of the connecting portion 131. The extension portion 132 can be composed of multiple strip-shaped protrusions, or it can be annular; no specific limitation is made here. The magnetic yoke portion 133 is formed by extending the outer edge of the extension portion 132 along the axial direction parallel to the rotating shaft 12 and toward the bearing 17. The magnetic yoke portion 133 can be composed of multiple strip-shaped protrusions, or it can be annular, extending along the circumference of the rotating shaft 12 from a single surface; no specific limitation is made here.

[0053] Please see Figure 3The stator 14 is mounted on the side of the base 11 facing the extension 132 and located inside the yoke 133. Essentially, the stator 14 is located within the cover-like structure formed by the extension 132 and the yoke 133, with the yoke 133 located on the outer periphery of the stator 14. One of the yoke 133 and the stator 14 is provided with a coil winding, and the other is provided with a magnetic pole. The rotor 13 is driven to rotate by changing the magnetism of the coil winding and its interaction with the magnetic pole through changes in the direction of current flow within the coil winding. Preferably, the yoke 133 is provided with a magnetic pole, and the stator 14 is provided with a coil winding, thus forming a brushless external rotor motor 13, thereby simplifying the structure of the traction machine 1.

[0054] There are many ways to mount the stator 14 to the frame 11. The stator 14 can be mounted to the frame 11 by screw connection, or by snap-fit ​​connection, or by other methods. No specific limitation is made here.

[0055] The traction sheave 15 is connected to the rotating shaft 12 and is located between two adjacent bearings 17. When the rotating shaft 12 rotates, it drives the traction sheave 15 to rotate, which in turn drives the steel cable to move, thus moving the car. The outer circumference of the traction sheave 15 typically has multiple grooves spaced apart along the axial direction. These grooves can be semi-circular, wedge-shaped, or other shapes; no specific limitation is made here. The traction sheave 15 can be made of metal, polymer, or composite materials; no specific limitation is made here.

[0056] Please see Figure 3 The rotating shaft 12 is mounted on the base 11 via at least two bearings 17, thus the bearings 17 are located within the base 11. The traction sheave 15 is located between two adjacent bearings 17, thus the traction sheave 15 is located within the base 11. The traction sheave 15 engages with the steel cable, and the steel cable engages with the car. Preferably, the base 11 is provided with clearance holes 115 to facilitate the passage of the steel cable through the base 11 and engagement with the traction sheave 15. It is understood that the rotating shaft 12, bearings 17, traction sheave 15, and rotor 13 are all coaxially arranged.

[0057] The brake 16 is axially connected to one end of the rotating shaft 12. The brake 16 is an important guarantee for the safe operation of the car. The brake 16 can be electromagnetic, hydraulic, or mechanical, without specific limitations. It should be noted that the two ends of the rotating shaft 12 in the axial direction can be connected to the bearing 17 at one end and the other end passes through the traction sheave 15, the remaining bearings 17, the machine base 11, and the rotor 13 to connect to the brake 16. Alternatively, the two ends of the rotating shaft 12 in the axial direction can be connected to the rotor 13 at one end and the other end passes through the bearing 17, the traction sheave 15, and the machine base 11 to connect to the brake 16. Or, the two ends of the rotating shaft 12 in the axial direction can be located outside the machine base 11 and the other end passes through the bearing 17, the traction sheave 15, the machine base 11, and the rotor 13 to connect to the brake 16, without specific limitations.

[0058] Preferably, please refer to Figure 3 The brake 16 is located on the side of the base 11 opposite to the stator 14. This can be understood as the brake 16 and the stator 14 being located on opposite sides of the base 11 along the axial direction of the shaft 12. This can stabilize the center of gravity of the overall structure of the traction machine 1 and reduce the distance between the brake 16 and the base 11, thereby reducing the bending moment of the weight of the brake 16 on the shaft 12.

[0059] During the operation of the traction sheave 15, the stator 14 and the rotor 13 cooperate to make the rotor 13 rotate. The rotor 13 drives the shaft 12 to rotate through the connecting part 131, and the shaft 12 drives the traction sheave 15 to rotate. When it is necessary to stop the rotation of the traction sheave 15, the brake 16 drives the shaft 12 to stop rotating, thereby stopping the rotation of the traction sheave 15.

[0060] The traction machine 1 in this embodiment can make the rotor 13 and the traction wheel 15 independent of each other, thereby reducing the weight of the rotor 13. As a result, the center of gravity of the rotor 13 is less offset when the rotor 13 rotates, making the rotor 13 more stable when moving at high speed, thus improving the stability of the traction machine 1 during operation.

[0061] Please refer to the following: Figure 2 , Figure 4 as well as Figure 5Specifically, the base 11 includes a support frame 111, a brake disc end cover 112, and a core seat 113. The support frame 111 is provided with a receiving cavity 1111. The brake disc end cover 112 has a first mounting hole 1121 and is installed at one end of the support frame 111 in the axial direction of the rotating shaft 12. The core seat 113 has a second mounting hole 1131 and is installed at the other end of the support frame 111 in the axial direction of the rotating shaft 12. The brake 16 is installed on the surface of the brake disc opposite to the receiving cavity 1111. The stator 14 core is installed on the surface of the core seat 113 opposite to the receiving cavity 1111. The traction sheave 15 is located in the receiving cavity 1111. Bearings 17 are installed in both the first mounting hole 1121 and the second mounting hole 1131.

[0062] With this configuration, during the assembly of the traction machine 1, the traction sheave 15 can be placed in the receiving cavity 1111 first, and then the brake disc end cover 112 and the iron core seat 113 can be installed on the two ends of the support frame 111 along the axial direction of the rotating shaft 12, thus facilitating the assembly of the traction machine 1. A bearing 17 is provided in the first mounting hole 1121 of the brake disc end cover 112, which can reduce the distance between the brake 16 and the adjacent bearing 17, thereby reducing the bending moment generated by the weight of the brake 16 on the rotating shaft 12. A bearing 17 is provided in the second mounting hole 1131 of the iron core seat 113, which can reduce the distance between the rotor 13 and the adjacent bearing 17, thereby reducing the bending moment generated by the weight of the rotor 13 on the rotating shaft 12.

[0063] Further, please refer to Figure 3 One of the core seat 113 and the brake disc end cover 112 is integrally formed with the support frame 111. This arrangement reduces the number of steps required to install one of the core seat 113 and the brake disc onto the support frame 111 during the assembly of the traction machine 1, thereby improving the assembly efficiency of the traction machine 1.

[0064] It should be noted that when the core seat 113 and the support frame 111 are integrally formed, the brake disc end cover 112 is detachably connected to the support frame 111. In this case, during the assembly of the traction machine 1, the traction sheave 15 is placed in the receiving cavity 1111 through the connection port between the brake disc end cover 112 and the support frame 111, and then the brake disc end cover 112 is installed on the support frame 111. Alternatively, when the brake disc end cover 112 and the support frame 111 are integrally formed, the core seat 113 and the support frame 111 are detachably connected. In this case, during the assembly of the traction machine 1, the traction sheave 15 is placed in the receiving cavity 1111 through the connection port between the core seat 113 and the support frame 111, and then the core seat 113 is installed on the support frame 111.

[0065] Please refer to the following: Figures 3 to 5In some embodiments of this application, the base 11 is provided with an annular mounting portion 114, the stator 14 is sleeved on the outer peripheral wall of the annular mounting portion 114, and the rotating shaft 12 is at least partially located inside the annular mounting portion 114. With this arrangement, the stator 14 is limited by the annular mounting portion 114, which facilitates the coaxial arrangement of the stator 14 and the rotating shaft 12, thereby facilitating the assembly of the traction machine 1. At the same time, the annular mounting portion 114 can better support the stator 14, thereby improving the stability of the traction machine 1 during operation.

[0066] Please refer to the following: Figures 3 to 5 Optionally, the inner wall surface of the annular mounting portion 114 is provided with a plurality of reinforcing ribs 1141, which are spaced apart along the circumference of the rotating shaft 12. This arrangement can improve the strength of the annular mounting portion 114 and prevent the annular mounting portion 114 from deforming due to the influence of the stator 14.

[0067] Specifically, the two surfaces of the reinforcing rib 1141 are connected to the inner wall surface of the annular mounting portion 114 and the surface of the base 11 facing the stator 14, respectively. Thus, when the annular mounting portion 114 is subjected to its own radial pressure, it can transmit the pressure to the surface of the base 11 facing the stator 14 through the reinforcing rib 1141.

[0068] It should be noted that after the stator 14 is fitted onto the annular mounting portion 114, the stator 14 can be spaced apart from the surface of the frame 11 facing the stator 14, or the stator 14 can abut against the surface of the frame 11 facing the stator 14; no specific limitation is made here. The stator 14 can be partially fitted onto the annular mounting portion 114, or the stator 14 can be completely fitted onto the annular mounting portion 114; no specific limitation is made here.

[0069] Please refer to the following: Figure 4 as well as Figure 6 In some embodiments of this application, the outer peripheral wall of the base 11 is provided with clearance holes 115, which are used for steel ropes to extend into the base 11 and cooperate with the traction sheave 15. The traction sheave 15 is provided with a plurality of first through holes 151 through the axial direction of the shaft 12, and the plurality of first through holes 151 are arranged at intervals along the circumference of the traction sheave 15. This arrangement can reduce the weight of the traction sheave 15, thereby reducing the weight of the traction machine 1. At the same time, air can flow through the plurality of first through holes 151 to the clearance holes 115, thereby facilitating air circulation within the base 11 and facilitating air cooling of the traction sheave 15.

[0070] It should be noted that the clearance hole 115 can be formed by two holes, with the steel rope passing through one hole, wrapping around the outer peripheral wall of the traction sheave 15, and then exiting through the other hole. Alternatively, the clearance hole 115 can be formed by one hole, with the steel rope passing through this hole, wrapping around the outer peripheral wall of the traction sheave 15, and then exiting through this hole. These are not listed here.

[0071] Please see Figure 6 Optionally, the traction sheave 15 may have at least one reinforcing rib 152 between each of two adjacent clearance holes 115. This arrangement strengthens the traction sheave 15, allowing it to withstand greater weight. It should be noted that the two surfaces of the reinforcing rib 152 abut against the axial surface of the traction sheave 15 and the inner wall surface of the traction sheave 15, respectively. It can be understood that the axial surface of the traction sheave 15 has a weight-reducing groove, and the inner wall surface of the traction sheave 15 is the wall of the weight-reducing groove. The weight-reducing groove effectively reduces the weight of the traction sheave 15. Preferably, the traction sheave 15 has a weight-reducing groove recessed on both axial surfaces. When the traction sheave 15 is provided with one weight-reducing groove, the groove depth is equal to the sum of the groove depths of the two weight-reducing grooves when the traction sheave 15 is provided with two weight-reducing grooves. In this case, providing two weight-reducing grooves on the traction sheave 15 can reduce the distance from the two ends of the traction sheave 15 in the circumferential direction of the shaft 12 to the bottom of the weight-reducing groove, thereby reducing the bending moment of the steel rope on the two ends of the traction sheave 15 in the axial direction of the shaft 12.

[0072] Furthermore, please refer to the following: Figures 2 to 4 The extension portion 132 is provided with heat dissipation holes 1321, and the surface of the base 11 facing the extension portion 132 is provided with a second through hole 116. With this configuration, the extension portion 132 is provided with heat dissipation holes 1321, and the second through hole 116 and the clearance hole 115 are connected, so that the heat on the rotor 13 can be carried away by air from the heat dissipation holes 1321, the second through hole 116 and the clearance hole 115 to the outside of the base 11, thereby better cooling the rotor 13.

[0073] Please see Figure 3 In some embodiments of this application, the traction machine 1 further includes a protective cover 18, which is installed on the base 11. The protective cover 18 and the base 11 together form a protective cavity 19, and the rotor 13 is located within the protective cavity 19. This arrangement, by covering the rotor 13 with the protective cover 18, prevents external environmental influences on the rotor 13, thereby protecting it. The protective cover 18 can be made of various materials; it can be made of metal or a relatively hard plastic, and no specific limitation is made here. The protective cover 18 can be installed on the base 11 by screw connection or by snap-fit ​​connection, and no specific limitation is made here.

[0074] When the brake 16 and the rotor 13 are located on the same side of the base 11, the brake 16 can be located inside the protective cavity 19 or outside the protective cavity 19; no specific limitation is made here. It should be noted that when the brake 16 is located outside the protective cavity 19, the protective cover 18 needs to be provided with a hole for the rotating shaft 12 to extend out, so as to facilitate the connection between the brake 16 and the rotating shaft 12.

[0075] Please refer to the following: Figure 3 as well as Figure 5 In some embodiments of this application, the inner surface of the base 11 is further provided with a first limiting protrusion 117, which abuts against the surface of at least one bearing 17 facing away from the traction sheave 15. This arrangement limits the bearing 17's direction away from the traction sheave 15, preventing it from moving away from the traction sheave 15. It should be noted that the first limiting protrusion 117 can be formed by a single protrusion, in which case it abuts against the surface of one bearing 17 facing away from the traction sheave 15. Alternatively, the first limiting protrusion 117 can be formed by two protrusions spaced apart axially along the shaft 12, with the two protrusions located on opposite sides of the traction sheave 15, in which case the two protrusions abut against the surfaces of two bearings 17 facing away from the traction sheave 15 respectively. These variations are not listed here. The first limiting protrusion 117 may be arranged in a ring shape, or it may be formed by a plurality of protrusions arranged circumferentially along the axis of rotation 12. No specific limitation is made here.

[0076] Please refer to the following: Figure 3 as well as Figure 7 In some embodiments of this application, a second limiting protrusion 121 protrudes from the outer peripheral wall of the rotating shaft 12, and the second limiting protrusion 121 abuts against at least one bearing 17 near the surface of the traction sheave 15. It is understood that the second limiting protrusion 121 is located between the two bearings 17 at the ends. This arrangement allows the second limiting protrusion 121 to limit the bearing 17's movement towards the traction sheave 15, preventing the bearing 17 from moving towards the traction sheave 15. It should be noted that the second limiting protrusion 121 can be formed by a single protrusion, with the traction sheave 15 sleeved on the second limiting protrusion 121, and the second limiting protrusion 121 abutting against the surfaces of the two adjacent bearings 17 near the traction sheave 15; the second limiting protrusion 121 can also be formed by a single protrusion, with the second limiting protrusion 121 located between the traction sheave 15 and a bearing 17, and the two ends of the second limiting protrusion 121 in the axial direction of the rotating shaft 12 abutting against the two opposing surfaces of the traction sheave 15 and the bearing 17; the second limiting protrusion 121 can also be formed by two protrusions, with the traction sheave 15 located between the two protrusions, and the two protrusions abutting against the surfaces of the two bearings 17 near the traction sheave 15, and so on.

[0077] Preferably, the second limiting protrusion 121 is located between the traction sheave 15 and a bearing 17. The two ends of the second limiting protrusion 121 in the axial direction of the shaft 12 respectively abut against the two opposing surfaces of the traction sheave 15 and the bearing 17. In this way, the second limiting protrusion 121 can limit the bearing 17 in the direction close to the traction sheave 15, and at the same time, the second limiting protrusion 121 can also limit the traction sheave 15 in the direction close to the bearing 17, thereby optimizing the structure of the shaft 12.

[0078] The second limiting protrusion 121 can also be formed by two protrusions spaced apart axially along the shaft 12, with the two protrusions located on opposite sides of the traction sheave 15. In this case, the two protrusions abut against the surfaces of the two bearings 17 near the traction sheave 15, which will not be listed here. The second limiting protrusion 121 can be arranged in a ring shape, or it can be formed by multiple protrusions spaced apart circumferentially along the shaft 12, without specific limitations.

[0079] Please refer to the following: Figure 3 as well as Figure 7 In some embodiments of this application, a third limiting protrusion 122 protrudes from the outer peripheral wall of the rotating shaft 12, and the third limiting protrusion 122 abuts against the surface of the connecting portion 131 near the traction sheave 15. This arrangement allows the rotor 13 to be limited in the direction near the traction sheave 15 by the third limiting protrusion 122, preventing the rotating shaft 12 from moving in that direction. The third limiting protrusion 122 may be annular, or it may be formed by multiple protrusions spaced apart circumferentially along the rotating shaft 12; no specific limitation is made here.

[0080] In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0081] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0082] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0083] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0084] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A traction machine, characterized in that, include: Base; A rotating shaft is mounted to the base via at least two bearings and extends at least partially out of the base; The rotor includes a connecting portion that is drively connected to the portion of the rotating shaft that extends out of the base, an extension portion that extends outward from the outer edge of the connecting portion, and a magnetic yoke portion that extends from the outer edge of the extension portion along an axial direction parallel to the rotating shaft and toward the bearing. The stator is mounted on the side of the base facing the extension and is located inside the magnetic yoke. A traction sheave, driven by the shaft, and located between two adjacent bearings; and The brake is connected to one axial end of the rotating shaft.

2. The traction machine as described in claim 1, characterized in that, The brake is located on the side of the machine base opposite to the stator.

3. The traction machine as described in claim 2, characterized in that, The base includes: Support frame with receiving cavity; A brake disc end cap, having a first mounting hole, is mounted on one axial end of the support frame on the rotating shaft; and The iron core base has a second mounting hole and is mounted on the other end of the support frame in the axial direction of the rotating shaft; The brake is mounted on the surface of the brake disc opposite to the accommodating cavity, the stator core is mounted on the surface of the core seat opposite to the accommodating cavity, the traction sheave is located inside the accommodating cavity, and the bearing is installed in both the first mounting hole and the second mounting hole.

4. The traction machine as described in claim 3, characterized in that, One of the iron core seat and the brake disc end cover is integrally formed with the support frame.

5. The traction machine as described in any one of claims 1-4, characterized in that, The base is provided with an annular mounting part, the stator is sleeved on the outer peripheral wall of the annular mounting part, and the rotating shaft is at least partially located on the inner side of the annular mounting part.

6. The traction machine as described in claim 5, characterized in that, The inner wall of the annular mounting part is provided with a plurality of reinforcing ribs, which are spaced apart circumferentially along the axis of rotation.

7. The traction machine as described in any one of claims 1-4, characterized in that, The outer peripheral wall of the base is provided with a clearance hole, which is used for the steel rope to extend into the base and cooperate with the traction sheave. The traction sheave is provided with a plurality of first through holes along the axial direction of the shaft, and the plurality of first through holes are arranged at intervals along the circumference of the traction sheave.

8. The traction machine as described in claim 7, characterized in that, The traction sheave is provided with at least one reinforcing rib between each of the two adjacent clearance holes.

9. The traction machine as described in claim 7, characterized in that, The extension portion is provided with heat dissipation holes, and the surface of the base facing the extension portion is provided with a second through hole.

10. The traction machine according to any one of claims 1-4, characterized in that, Also includes: A protective cover is installed on the base, and the protective cover and the base together form a protective cavity, in which the rotor is located.

11. The traction machine according to any one of claims 1-4, characterized in that, The inner surface of the base is further provided with a first limiting protrusion, which abuts against the surface of at least one of the bearings facing away from the traction sheave.

12. The traction machine according to any one of claims 1-4, characterized in that, The outer peripheral wall of the shaft is provided with a second limiting protrusion, which abuts against at least one of the bearing surfaces near the traction sheave.

13. The traction machine according to any one of claims 1-4, characterized in that, The outer peripheral wall of the rotating shaft is provided with a third limiting protrusion, which abuts against the surface of the connecting part near the traction sheave.

14. An elevator, characterized in that, include: The car; steel rope; as well as The traction machine as described in any one of claims 1-13, wherein the traction sheave is connected to the car via the steel rope to drive the car to rise and fall.

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