Traction machine with dual motors and its assembly method

Abstract

The present invention discloses a traction machine with dual motors and an assembly method thereof, belonging to the technical field of traction machines. The traction machine includes a traction wheel, a main rotating shaft, two supporting bodies, and two sets of motor assemblies. The two supporting bodies are respectively arranged at both ends of the traction wheel, one motor assembly is installed between the first end of the traction wheel and one of the supporting bodies, and the other motor assembly is installed between the second end of the traction wheel and the other supporting body. The two supporting bodies are respectively sleeved on both ends of the main rotating shaft, and the main rotating shaft and the supporting bodies rotate in coordination. The traction wheel is sleeved outside the main rotating shaft and fixed to the main rotating shaft. The two supporting bodies are symmetrically arranged relative to the center of the main rotating shaft, and the traction wheel is symmetrically arranged relative to the center of the main rotating shaft. When the traction machine is in operation, the forces acting on the two supporting bodies are consistent, the bearing capacity of the traction machine is more uniform, and the dynamic balance of the traction machine is achieved.

Description

Technical Field

[0001] This invention relates to the technical field of traction machines, and in particular to a traction machine with dual motors and its assembly method. Background Technology

[0002] With the development of super high-rise buildings in China, the application of ultra-high-speed elevators is becoming increasingly widespread in the domestic market. Currently, the traction machines used in ultra-high-speed elevators are divided into two types: dual-support permanent magnet synchronous internal rotor and external rotor structures, with the internal rotor being the mainstream. These products generally suffer from key technical problems such as large external dimensions, especially axial dimensions, heavy weight, and complex structures. This results in large space requirements for the elevator's machine room, increasing the construction cost of high-rise buildings and failing to meet market demands for high-performance, high-efficiency, small-volume, and lightweight elevator traction machines. Therefore, developing permanent magnet synchronous traction machines with small external dimensions, especially axial dimensions, light weight, and a simple and compact structure would be more suitable for small machine room applications and could further enhance the product's market competitiveness.

[0003] In existing technologies, such as axially excited traction machines, two axially excited motors are typically arranged symmetrically on the left and right, with a traction sheave between them. This type of traction machine has a relatively short axial length, making it suitable for small machine room applications. However, during installation, manufacturing precision errors and fit tolerances in the axially excited motors can lead to unbalanced magnetic forces in the traction machine's axial direction. This forces the bearings to withstand a certain axial force, affecting their lifespan. Furthermore, the traction sheave and its main bearings are prone to deformation under heavy loads, resulting in uneven clearance between the disc rotor and the stator, thus affecting the motor's electrical performance stability. Therefore, there is significant room for improvement in the overall structural layout design of axially excited traction machines. Summary of the Invention

[0004] The purpose of this invention is to improve the problem of unbalanced load-bearing capacity in the axial direction of existing traction machines, and to provide a traction machine with dual motors and its assembly method.

[0005] The technical solutions for achieving the above objectives include the following:

[0006] A traction machine with dual motors includes a traction sheave, a main shaft, two support bodies, and two sets of motor assemblies. The two support bodies are respectively located at both ends of the traction sheave. One motor assembly is installed between the first end of the traction sheave and one of the support bodies, and the other motor assembly is installed between the second end of the traction sheave and the other support body.

[0007] Two support bodies are respectively sleeved on both ends of the main rotating shaft, and the main rotating shaft is rotatably engaged with the support bodies; the traction sheave is sleeved on the outside of the main rotating shaft and fixed to the main rotating shaft;

[0008] The traction sheave is symmetrically arranged with respect to the center of the main shaft, and the two support points between the main shaft and the traction sheave are symmetrically arranged with respect to the center of the main shaft.

[0009] In one embodiment, the support body has a first support member, which is bent and has a first sidewall and a second sidewall.

[0010] The traction sheave has a second support member, which is disposed close to the first side wall and the second side wall, and the inner side of the second support member forms a mounting groove between the first side wall and the second side wall.

[0011] The motor assembly includes a stator core and a rotor permanent magnet. The stator core is mounted on a first side wall, and the rotor permanent magnet is mounted on the inner side of a second support member. Both the stator core and the rotor permanent magnet are disposed in mounting slots, with the rotor permanent magnet positioned close to the stator core.

[0012] In one embodiment, the first support member includes a first support portion and a second support portion, the first support portion and the second support portion are fixed together to form an L-shaped structure;

[0013] The outer surface of the first support portion forms a first sidewall, and the outer surface of the second support portion forms a second sidewall, with the first sidewall and the second sidewall being disposed adjacent to each other.

[0014] In one embodiment, the first support portion is a hollow columnar structure, and the second support portion is a hollow disc-shaped structure.

[0015] The outer diameter of the second support is larger than the outer diameter of the first support.

[0016] In one embodiment, the traction machine further includes a brake and a bearing assembly, the bearing assembly being mounted on the first support and sleeved around the main shaft, the main shaft being rotatably connected to the first support via the bearing assembly;

[0017] The brake is mounted on the second support.

[0018] In one embodiment, the brake includes a brake disc, brake pads, and a brake core. The brake core is movably mounted on a second support. The brake disc is mounted on the side wall of the second support. The brake pads are mounted on the brake core and are positioned close to the brake disc to abut against it.

[0019] In one embodiment, the bearing assembly includes a bearing and two sealing caps. The bearing is sleeved on the outside of the main rotating shaft, and both sealing caps are sleeved on the outside of the main rotating shaft, with the two sealing caps respectively disposed at both ends of the bearing.

[0020] The outer ring of the bearing is fixed to the first support portion, and the inner ring of the bearing is fixed to the main shaft.

[0021] In one embodiment, the bearing assembly has two sets, and the two sets of bearing assemblies are respectively sleeved on both ends of the main shaft;

[0022] The two sets of bearing assemblies are respectively installed on the two support bodies, and the two sets of bearing assemblies are arranged symmetrically with respect to the center of the main shaft.

[0023] In one embodiment, the traction sheave further includes a rotating wheel, with two second supports respectively mounted at both ends of the rotating wheel, and the outer wall of the rotating wheel having a rope groove;

[0024] The second support member has a ring-shaped structure, and the outer diameter of the second support member is larger than the outer diameter of the rotating wheel. A clearance groove is formed between the inner sides of the two second support members and the outer wall of the rotating wheel.

[0025] The present invention also proposes a method for assembling a traction machine, comprising the following steps:

[0026] Step 1: Install one set of motor assemblies onto one of the support bodies and the first end of the traction sheave; install the other set of motor assemblies onto the other support body and the second end of the traction sheave.

[0027] Step 2: The traction sheave is fitted onto the main shaft, and the two ends of the main shaft are respectively inserted into the through holes of the two support bodies so that the main shaft and the support bodies can rotate together.

[0028] The technical solution provided by this invention has the following advantages and effects:

[0029] After being powered on, the two sets of motor assemblies of this traction machine have identical structures and generate equal power. The power generated by the two sets of motor assemblies is applied to the two supporting bodies through the main shaft. When the traction machine is in operation, the forces borne by the two supporting bodies are consistent, achieving dynamic balance of the traction machine. Moreover, in this traction machine, the traction sheave and the two supporting bodies are completely symmetrical with respect to the center of the main shaft, making the load-bearing force on the traction machine more uniform and the stress structure better. Attached Figure Description

[0030] The accompanying drawings illustrate specific examples of the technical solutions described in this invention and, together with the detailed embodiments, form part of the specification, serving to explain the technical solutions, principles, and effects of this invention.

[0031] Unless otherwise specified or defined, the same reference numerals in different figures represent the same or similar technical features, and different reference numerals may be used to represent the same or similar technical features.

[0032] Figure 1 This is a schematic diagram of a traction machine with dual motors according to an embodiment of the present invention;

[0033] Figure 2 This is a front view of a traction machine with dual motors according to an embodiment of the present invention;

[0034] Figure 3 This is a cross-sectional view of a traction machine with dual motors according to an embodiment of the present invention;

[0035] Figure 4 This is one embodiment of the present invention. Figure 3 A magnified view of part A;

[0036] Explanation of reference numerals in the attached figures:

[0037] 100. Traction machine; 1. Base; 2. Support body; 21. First support member; 211. First support part; 212. Second support part; 213. First side wall; 214. Second side wall; 22. Mounting groove; 23. First heat dissipation gap; 24. Second heat dissipation gap; 3. Main shaft; 4. Traction sheave; 41. Second support member; 42. Rotating wheel; 421. Rope groove; 43. Clearance groove; 5. Brake; 51. Brake pad; 52. Brake disc; 53. Brake core; 6. Cooling system; 61. Heat sink; 62. First heat dissipation channel; 63. First heat dissipation hole; 64. Second heat dissipation channel; 65. Second heat dissipation hole; 66. Third heat dissipation channel; 7. Motor assembly; 71. Stator core; 72. Rotor permanent magnet; 8. Bearing assembly; 81. Sealing cover; 82. Bearing; 9. Encoder; 10. Junction box. Detailed Implementation

[0038] To facilitate understanding of the present invention, specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0039] Unless otherwise specified or defined, the terms "first," "second," etc., used in this document are for distinguishing names only and do not represent a specific number or order.

[0040] Unless otherwise stated or defined, the term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0041] It should be noted that when a component is considered "fixed" to another component, it can be directly fixed to the other component or there can be an intervening component; when a component is considered "connected" to another component, it can be directly connected to the other component or there can be an intervening component; when a component is considered "mounted" on another component, it can be directly mounted on the other component or there can be an intervening component; when a component is considered "placed" on another component, it can be directly placed on the other component or there can be an intervening component.

[0042] Example 1

[0043] This invention proposes a traction machine 100 with dual motors, such as... Figures 1 to 4 As shown, the assembly includes a traction sheave 4, a main shaft 3, a support body 2, a motor assembly 7, and a heat sink 61. The traction sheave 4 is sleeved on the first end of the main shaft 3, and the support body 2 is sleeved on the second end of the main shaft 3, with the main shaft 3 and the support body 2 rotating in cooperation. The motor assembly 7 includes a stator core 71 and a rotor permanent magnet 72. The stator core 71 is installed on the outside of the support body 2, and the rotor permanent magnet 72 is installed on the inside of the traction sheave 4, with the rotor permanent magnet 72 positioned close to the stator core 71. There is a first heat dissipation channel 62 and a first heat dissipation hole 63 between the support body 2 and the traction sheave 4. The heat sink 61 is installed on the outer wall of the support body 2, with the air outlet direction of the heat sink 61 facing the first end of the first heat dissipation channel 62. The second end of the first heat dissipation channel 62 is connected to the first heat dissipation hole 63.

[0044] Specifically, when the stator core 71 is energized, it generates a magnetic field, acting as a permanent magnet. This magnetic field interacts with the rotor permanent magnet 72, driving the rotor permanent magnet 72 to rotate. The rotor permanent magnet 72 then drives the traction sheave 4 to rotate. A steel rope is wound around the traction sheave 4, which in turn moves the elevator car up and down, thus achieving the elevator's vertical movement. Since the traction sheave 4 is mounted on the main shaft 3, which rotates in conjunction with the support body 2, the support body 2 supports the traction sheave 4 to rotate stably via the main shaft 3.

[0045] Research has revealed that when motor assembly 7 is performing work, the coils wound on the stator core 71 and rotor permanent magnet 72, along with factors such as the material used for the coils, increased excitation current, and vibration or noise from the traction machine 100, can easily cause motor assembly 7 to overheat. This overheating can lead to demagnetization between the stator core 71 and rotor permanent magnet 72, thereby reducing the output power of motor assembly 7. Overheating of motor assembly 7 can also cause an increase in internal temperature, damaging internal parts and components. If not addressed promptly, this damage can lead to motor malfunctions and even serious safety accidents. Therefore, overheating of motor assembly 7 directly affects the performance and power output of the motor on a small scale, and can cause serious safety accidents on a large scale.

[0046] Since the supporting body 2 and the traction sheave 4 do not need to contact each other, and a certain air gap needs to be maintained, the direction of the air gap can be designed to form a first heat dissipation channel 62 and a first heat dissipation hole 63. The heat generated by the motor assembly 7 is dissipated into the first heat dissipation channel 62. By setting the heat sink 61, when the heat sink 61 rotates, it accelerates the flow of hot air in the first heat dissipation channel 62. The heat flows out from the first heat dissipation hole 63 through the first heat dissipation channel 62. The heat sink 61 also blows the air outside the traction machine 100 into the first heat dissipation channel 62, realizing the heat exchange between the inside and outside of the traction machine 100, cooling the motor assembly 7, avoiding overheating of the motor assembly 7, and thus improving the service life and output power of the traction machine 100.

[0047] Preferably, the support body 2 and the traction sheave 4 are further provided with a second heat dissipation channel 64 and a second heat dissipation hole 65. The first heat dissipation channel 62 is connected to the second heat dissipation channel 64. The air outlet direction of the heat dissipation component 61 is towards the first end of the second heat dissipation channel 64. The second end of the second heat dissipation channel 64 is connected to the second heat dissipation hole 65. The first heat dissipation hole 63 and the second heat dissipation hole 65 are disposed away from each other. Specifically, by utilizing the air gap between the support body 2 and the traction sheave 4, the support body 2 and the traction sheave 4 are further provided with a second heat dissipation channel 64 and a second heat dissipation hole 65. The first heat dissipation channel 62 is connected to the second heat dissipation channel 64. The first end of the first heat dissipation channel 62 and the first end of the second heat dissipation channel 64 intersect, so that when the heat dissipation component 61 rotates, it can introduce external air from the traction machine 100 into the first heat dissipation channel 62 and the second heat dissipation channel 64 respectively. Furthermore, the first heat dissipation channel 62 and the second heat dissipation channel 64 have different orientations inside the traction machine 100, allowing them to carry away heat generated at different locations within the traction machine 100. The first heat dissipation hole 63 and the second heat dissipation hole 65 are positioned far apart, which prevents heat from accumulating within the first heat dissipation channel 62. The heat generated inside the traction machine 100 can be dissipated to the outside of the traction machine 100 through the first heat dissipation channel 62 and the first heat dissipation hole 63, or through the second heat dissipation channel 64 and the second heat dissipation hole 65, further improving the heat dissipation efficiency of the traction machine 100.

[0048] Preferably, the opening direction of the first heat dissipation hole 63 intersects or is opposite to the opening direction of the second heat dissipation hole 65. Specifically, the traction machine 100 has two heat dissipation holes with different opening directions on the outside. The heat inside the traction machine 100 is dissipated through the first heat dissipation hole 63 and the second heat dissipation hole 65, which prevents the heat of the traction machine 100 from accumulating at a certain position. Since heat accumulation will also increase the temperature at that local position, this arrangement can further improve the heat dissipation efficiency.

[0049] In some embodiments, the support body 2 has a first support member 21, which is bent and has a first sidewall 213 and a second sidewall 214; the traction wheel 4 has a second support member 41, which is disposed close to the first sidewall 213 and the second sidewall 214, and an mounting groove 22 is formed between the inner side of the second support member 41 and the first sidewall 213 and the second sidewall 214; the stator core 71 is mounted on the first sidewall 213, and the rotor permanent magnet 72 is mounted on the inner side of the second support member 41; both the stator core 71 and the rotor permanent magnet 72 are disposed in the mounting groove 22; the first heat dissipation channel 62 and the second heat dissipation channel 64 are respectively connected to the mounting groove 22. Specifically, by mounting the stator core 71 on the first sidewall 213, and forming an mounting groove 22 between the inner side of the second support member 41 and the first and second sidewalls 213 and 214, the rotor permanent magnet 72 can be mounted on the inner side of the second support member 41. The second support member 41 is then fitted over the first support member 21. This allows both the stator core 71 and the rotor permanent magnet 72 to be positioned within the mounting groove 22, thus concealing the motor assembly 7 within the traction machine 100. Furthermore, the heat generated by the motor assembly 7 during operation accumulates within the mounting groove 22. This mounting groove 22 is connected to the first and second heat dissipation channels 62 and 64. The hot air in the mounting groove 22 diffuses into the first and second heat dissipation channels 62 and 64. As the air flows through these channels, it carries away the heat from the mounting groove 22. Therefore, the first and second heat dissipation channels 62 and 64 can reduce the temperature of the motor assembly 7, preventing overheating and increasing its power output.

[0050] In some embodiments, the traction wheel 4 further includes a rotating wheel 42, and a second support member 41 is mounted on the side wall of the rotating wheel 42; the first support member 21 includes a first support portion 211 and a second support portion 212, the first support portion 211 and the second support portion 212 are fixed together and form an L-shaped structure; a first heat dissipation gap 23 is provided between the second support portion 211 and the second support member 41, and the first heat dissipation gap 23 forms a first heat dissipation channel 62; a second heat dissipation gap 24 is provided between the first support portion 211 and the second support portion 212, and a second heat dissipation channel 64 is formed between the first support portion 211 and the rotating wheel 42; the second heat dissipation channel 64, the mounting groove 22, the second heat dissipation gap 24 and the second heat dissipation hole 65 are connected in sequence; and / or the second heat dissipation channel 64, the mounting groove 22, the second heat dissipation gap 24 and the air outlet of the heat sink 61 are connected in sequence. Specifically, the first support 211 and the second support 212 are fixed together to form an L-shaped structure. The first support 21 has an L-shaped groove, and the second support 41 is disposed within the L-shaped groove, providing space between the first support 21 and the second support 41 for mounting the stator core 71 and the rotor permanent magnet 72. The second support 41 is mounted on the rotating wheel 42, which is mounted on the support body 2 via the main shaft 3. Gaps exist between the first support 211 and the rotating wheel 42, and between the second support 212 and the second support 41, allowing heat from the motor assembly 7 to dissipate to these gaps during operation. These gaps form a first heat dissipation channel 62 and a second heat dissipation channel 64. The second heat dissipation hole 65 communicates with the mounting groove 22 via the second heat dissipation channel 64, and the first heat dissipation hole 63 communicates with the mounting groove 22 via the first heat dissipation channel 62. The motor assembly 7 within the mounting groove 22 dissipates heat through these two heat dissipation channels, further reducing the temperature of the motor assembly 7.

[0051] In some embodiments, the traction machine 100 further includes a brake 5, which includes a brake disc 52, brake pads 51, and a brake core 53. The brake core 53 is movably mounted on the second support portion 212. The brake disc 52 is mounted on the side wall of the second support member 41. The brake pads 51 are mounted on the brake core 53 and are disposed near the brake disc 52 for abutting against it. A first heat dissipation gap 23 is provided between the brake disc 52 and the second support portion 212, and a first heat dissipation hole 63 is disposed near the brake disc 52. Specifically, the heat dissipation channel formed by the first heat dissipation gap 23 is guided to the brake disc 52, and the first heat dissipation hole 63 is disposed near the brake disc 52. When the brake 5 is engaged, the brake core 53 drives the brake pads 51 to move, causing the brake pads 51 to come into contact with the brake disc 52, thereby braking the brake disc 52. During braking, friction is generated between the brake pads 51 and the brake disc 52. This friction causes the brake pads 51 and the brake disc 52 to generate high temperatures. The brake disc 52 generates a lot of heat during operation. If this heat cannot be dissipated in time, the temperature of the brake disc 52 will rise, which may lead to a decrease in braking force or even failure. Therefore, maintaining the appropriate temperature of the brake disc 52 is crucial for the braking performance of the brake 5. When the motor assembly 7 stops working, the heat generated by the motor assembly 7 is relatively small, and the heat sink 61 can continue to operate. Since the heat from the first heat dissipation channel 62 is relatively small, the heat diffused by the first heat dissipation channel 62 has almost no effect on the brake disc 52. However, the air flow speed of the first heat dissipation hole 63 and the first heat dissipation gap 23 is relatively fast, which can quickly remove the heat near the brake disc 52, reduce the temperature of the brake disc 52 and the brake pad 51, indirectly cool down the brake 5, and improve the braking stability of the brake 5.

[0052] In some embodiments, the traction machine 100 further includes a bearing assembly 8, and two sets of motor assemblies 7, with the number of support bodies 2 corresponding to the number of motor assemblies 7; the two support bodies 2 are respectively disposed at both ends of the traction sheave 4, wherein one motor assembly 7 is installed between the first end of the traction sheave 4 and one of the support bodies 2, and the other motor assembly 7 is installed between the second end of the traction sheave 4 and the other support body 2; the two support bodies 2 are respectively sleeved on both ends of the main shaft 3, and the main shaft 3 is rotatably connected to the support bodies 2 through the bearing assembly 8; the traction sheave 4 is sleeved on the outside of the main shaft 3 and fixed to the main shaft 3. Specifically, by setting two sets of motor assemblies 7, the two stator cores 71 of the two sets of motor assemblies 7 are supported by two support bodies 2, which are mounted on the base 1. The two support bodies 2 have two first support members 21, and the two ends of the traction wheel 4 also have two second support members 41. The two rotor permanent magnets 72 are respectively set at the two ends of the traction wheel 4 through the two second support members 41 and correspond to the two stator cores 71. The two sets of motor assemblies 7 are symmetrically arranged with respect to the traction wheel 4. After the two sets of motor assemblies 7 are conductive, they will generate the same driving force, so that the two ends of the traction wheel 4 have two driving forces of the same magnitude. This will further improve the output power of the traction machine 100.

[0053] In some embodiments, there are two heat sinks 61, which are respectively disposed close to the two sets of motor assemblies 7; two first heat dissipation channels 62 and two second heat dissipation channels 64 are formed between the two support bodies 2 and the two ends of the traction sheave 4; one heat sink 61, together with one of the first heat dissipation channels 62 and the second heat dissipation channel 64, forms a first heat dissipation system 6; the other heat sink 61, together with the other first heat dissipation channel 62 and the second heat dissipation channel 64, forms a second heat dissipation system 6; the two heat dissipation systems 6 are used for heat dissipation of the two sets of motor assemblies 7 respectively. Specifically, by disposing of the two support bodies 2 at the two ends of the traction sheave 4, an air gap is formed between the two support bodies 2 and the two ends of the traction sheave 4, thereby forming two first heat dissipation channels 62 and two second heat dissipation channels 64 in the traction machine 100; the two sets of motor assemblies 7 are cooled by the two heat dissipation systems 6, and the two heat dissipation systems 6 can be relatively independent.

[0054] In some other embodiments, the traction machine 100 can perform work without using two sets of heat dissipation systems 6, simply by reducing the output power of the traction machine 100; however, using two sets of heat dissipation systems 6 can increase the output power of the traction machine 100. Therefore, the heat dissipation system 6 has significant practical value and importance for the output power of the traction machine 100.

[0055] In some embodiments, a third heat dissipation channel 66 is provided inside the traction sheave 4, and the two second heat dissipation channels 64 are connected through the third heat dissipation channel 66. Specifically, the two heat dissipation systems 6 can be connected through the third heat dissipation channel 66. When the traction sheave 4 is rotating, the third heat dissipation channel 66 also rotates with the traction sheave 4, and the two second heat dissipation channels 64 cannot dissipate heat through the third heat dissipation channel 66, so the third heat dissipation channel 66 has little practical significance. However, when the traction machine 100 is stationary or rotating at low speed, the connection between the two second heat dissipation channels 64 through the third heat dissipation channel 66 allows the heat inside the traction machine 100 to dissipate through the two second heat dissipation channels 64, further improving the heat dissipation efficiency inside the traction machine 100.

[0056] Preferably, the bearing assembly 8 includes a bearing 82 and two sealing covers 81. The bearing 82 is sleeved on the outside of the main rotating shaft 3, and both sealing covers 81 are sleeved on the outside of the main rotating shaft 3. The two sealing covers 81 are respectively disposed at both ends of the bearing 82, and the sealing covers 81 are fixed to the first support part 211. The outer ring of the bearing 82 is fixed to the first support part 211, and the inner ring of the bearing 82 is fixed to the main rotating shaft 3. Specifically, the outer ring of the bearing 82 and the inner ring of the bearing are rotatably engaged by ball bearings. The main rotating shaft 3 is rotatably connected to the support body 2 through the bearing 82. The two sealing covers 81 are respectively disposed at both ends of the bearing 82, which can shield the bearing 82, prevent dust from falling into the bearing 82, prevent dust from affecting the accuracy of bearing rotation, and further improve the stability of the bearing assembly 8 during rotation.

[0057] Example 2

[0058] The present invention also proposes a traction machine 100 with dual motors, such as... Figures 1 to 4As shown, the system includes a traction sheave 4, a main shaft 3, two support bodies 2, and two sets of motor assemblies 7. The two support bodies 2 are respectively located at both ends of the traction sheave 4. One motor assembly 7 is installed between the first end of the traction sheave 4 and one of the support bodies 2, and the other motor assembly 7 is installed between the second end of the traction sheave 4 and the other support body 2. The two support bodies 2 are respectively sleeved on both ends of the main shaft 3, and the main shaft 3 and the support bodies 2 are rotatably coupled. The traction sheave 4 is sleeved on the outside of the main shaft 3 and fixed to it. The traction sheave 4 is symmetrically arranged with respect to the center of the main shaft 3, and the two support points between the main shaft 3 and the traction sheave 4 are symmetrically arranged with respect to the center of the main shaft 3. Specifically, by setting two support bodies 2 and two sets of motor assemblies 7, the two support bodies 2 support both ends of the main shaft 3, allowing the two ends of the main shaft 3 to rotatably engage with the two support bodies 2, thus sleeved the traction sheave 4 on the outside of the main shaft 3. One set of motor assemblies 7 is located between the first end of the traction sheave 4 and one of the support bodies 2, and another set of motor assemblies 7 is located between the second end of the traction sheave 4 and another support body 2. Moreover, by installing two sets of motor assemblies 7 and two support bodies 2, the traction machine 100 is in a completely symmetrical structure as a whole. The support body 2 can be used to install the junction box 10 and the brake 5, and their installation positions and numbers can also be completely symmetrical or equal.

[0059] Therefore, after being powered on, the two sets of motor assemblies 7 of this traction machine 100 have identical structures and generate equal power. Furthermore, the two support points between the rotating shaft 3 and the traction sheave 4 are symmetrically arranged with respect to the center of the main rotating shaft 3. The power generated by the two sets of motor assemblies 7 is applied to the two supporting bodies 2 through the main rotating shaft 3. When the traction machine 100 is in operation, the forces on the two support points between the rotating shaft 3 and the traction sheave 4 are equal with respect to the center of the main rotating shaft 3, and the forces borne by the two supporting bodies 2 are consistent, achieving dynamic balance of the traction machine 100. Moreover, the traction sheave 4 and the two supporting bodies 2, which are completely symmetrical with respect to the center of the main rotating shaft 3, make the load-bearing capacity of the traction machine 100 more uniform and the stress structure better. Therefore, the external structure of the traction machine 100 is no longer related to the elevator hanging center and left and right output shafts, and can be arbitrarily arranged in a small machine room, making the machine room layout design and elevator installation very convenient. The production, assembly process, and assembly procedures of the traction machine 100 itself also become simpler.

[0060] In some embodiments, the support body 2 has a first support member 21, which is bent and has a first sidewall 213 and a second sidewall 214; the traction wheel 4 has a second support member 41, which is disposed near the first sidewall 213 and the second sidewall 214, and a mounting groove 22 is formed between the inner side of the second support member 41 and the first sidewall 213 and the second sidewall 214; the motor assembly 7 includes a stator core 71 and a rotor permanent magnet 72, the stator core 71 is mounted on the first sidewall 213, and the rotor permanent magnet 72 is mounted on the inner side of the second support member 41; both the stator core 71 and the rotor permanent magnet 72 are disposed in the mounting groove 22, and the rotor permanent magnet 72 is disposed near the stator core 71. Specifically, by placing the second support member 41 close to the first sidewall 213 and the second sidewall 214, the second support member 41 is sleeved outside the first support member 21, but there is still a certain air gap between the second support member 41 and the first support member 21. The stator core 71 and the rotor permanent magnet 72 are placed in the mounting groove 22. The stator core 71 is distributed circumferentially along the first support member 21, while the rotor permanent magnet 72 is distributed circumferentially along the second support member 41. The stator core 71 is located on the outside of the first support member 21, and the rotor permanent magnet 72 is located on the inside of the second support member 41. After the traction sheave 4 is assembled with the two support bodies 2 through the main shaft 3, the motor assembly 7 is hidden in the mounting groove 22. The structure combines the traction sheave 4 and the rotor yoke into one unit, eliminating the need for a separate rotor yoke and a tensioning connecting sleeve or key for transmitting torque. The stator core 71 is hidden and fixed on the support body 2, making the motor structure very simple and compact. Furthermore, the overall dimensions of the traction machine 100, especially the axial dimension, can be significantly reduced, making it more suitable for small machine room applications.

[0061] Furthermore, the stator core 71 of the motor assembly 7 can adopt a single-tooth structure, which can greatly improve the utilization rate of the core lamination material while reducing manufacturing difficulty. Moreover, this stator core 71 is installed on the outer wall of the first support member 21, and copper wire can be wound in a concentrated winding manner. The end dimension of the concentrated winding is much shorter than that of the distributed winding, which can significantly reduce copper wire waste, improve material utilization, reduce costs, and also significantly reduce the axial dimension.

[0062] Preferably, the first support member 21 includes a first support portion 211 and a second support portion 212. The first support portion 211 and the second support portion 212 are fixed together to form an L-shaped structure. The outer surface of the first support portion 211 forms a first sidewall 213, and the outer surface of the second support portion 212 forms a second sidewall 214. The first sidewall 213 and the second sidewall 214 are arranged adjacent to each other. Specifically, the first sidewall 213 of the first support portion 211 can be used to install the stator core 71, and the inner sidewall of the first support portion 211 can be used to install the bearing assembly 8. The main shaft 3 is rotatably connected to the first support portion 211 through the bearing assembly 8, making full use of the support function of the first support portion 211. The second sidewall 214 of the second support portion 212 corresponds to the outer side of the second support member 41 and can cover the mounting groove 22, so that the motor assembly 7 is completely hidden in the mounting groove 22. The second support portion 212 can also be used to support the brake 5. Therefore, the first support member 21 simultaneously supports the main shaft 3, the stator core 71, and the brake 5, making effective use of each support surface of the first support member 21. While ensuring that the traction machine 100 is symmetrical, after installation, there is no interference between the functions of each component, and the functions of each component can be maximized. Moreover, the traction machine 100 with this configuration is more reasonable and compact in structure.

[0063] It is understandable that the traction machine 100 fully utilizes the structural design of the two supporting bodies 2, so that the two motor assemblies 7, two bearing assemblies 8, and two brakes 5 are symmetrically arranged on both sides of the traction sheave 4, and are completely symmetrical with respect to the center of the traction sheave 4. This further makes the load-bearing capacity of the traction machine 100 more uniform and the stress structure better. In this embodiment, the traction machine 100 is in a symmetrical state after all the components are installed precisely because of the structure of the supporting bodies 2 and the structure of the traction sheave 4. Moreover, the bearing assemblies 8 and brakes 5 are essential functional components in the traction machine 100. The load-bearing force generated by the rotation of the traction sheave 4 is applied to the two supporting bodies 2 by the two sets of bearing assemblies 8, and the force on the two supporting bodies 2 is basically the same. In addition, the two brakes 5 brake the brake discs 52 at both ends of the traction sheave 4, which can further improve the braking efficiency of the traction machine 100.

[0064] In some embodiments, the first support portion 211 has a hollow columnar structure, and the second support portion 212 has a hollow disc-shaped structure; the outer diameter of the second support portion 212 is larger than the outer diameter of the first support portion 211. Specifically, the first support portion 211 has a hollow columnar structure, and the main rotating shaft 3 can be installed inside the first support portion 211 and rotatably connected to the first support portion 211 through the bearing assembly 8; while the second support portion 212 has a hollow disc-shaped structure, and the first support portion 211 can be installed inside the second support portion 212. There are various installation methods, such as fixing with screws, welding, and producing the first support portion 211 and the second support portion 212 as a single die-cast piece, which are not particularly limited here.

[0065] By utilizing the structural features of the first support part 211 and the second support part 212, the main shaft 3, the traction wheel 4, and the support body 2 are more compactly installed in terms of structure, making full use of the internal space of the traction machine 100 and further miniaturizing the size of the traction machine 100.

[0066] In some embodiments, the traction machine 100 further includes a brake 5 and a bearing assembly 8. The bearing assembly 8 is mounted on the first support portion 211 and is sleeved around the main rotating shaft 3. The main rotating shaft 3 is rotatably connected to the first support portion 211 via the bearing assembly 8. The brake 5 is mounted on the second support portion 212. Specifically, the bearing assembly 8 can be disposed within the hollow of the first support portion 211. The main rotating shaft 3 is rotatably engaged with the first support portion 211 via the bearing assembly 8. The brake 5 is mounted on the second support portion 212, making the positions of the bearing assembly 8 and the brake 5 on the support body 2 more reasonable.

[0067] Preferably, the brake 5 includes a brake disc 52, brake pads 51, and a brake core 53. The brake core 53 is movably mounted on the second support 212, the brake disc 52 is mounted on the side wall of the second support 41, and the brake pads 51 are mounted on the brake core 53. The brake pads 51 are positioned close to the brake disc 52 and are used to abut against the brake disc 52. Specifically, the brake disc 52 is mounted on the side wall of the second support 41, and the brake core 53 is movably mounted on the second support 212. When the brake core 53 is conductive, it moves, thereby causing the brake pads 51 to move away from the brake disc 52, thus releasing the brake 5. When the brake core 53 is de-energized, the brake core 53 is reset by the reset spring and moves to the initial position. The brake pad 51 contacts the brake disc 52, and a large frictional resistance is generated between the brake disc 52 and the brake pad 51, realizing the brake 5's locking state. The brake disc 52 is then fixed to the traction wheel 4 by the second support member 41, thereby realizing the emergency braking of the traction wheel 4.

[0068] In this embodiment, the brake 5 is a disc brake, which can adopt existing technology, such as Chinese Patent Application No. 202410378304.5, which discloses a disc brake and braking method. The disc brake will not be described in detail again.

[0069] Preferably, the bearing assembly 8 has two sets, each set sleeved on both ends of the main shaft 3; the two sets of bearing assemblies 8 are respectively mounted on two support bodies 2, and are arranged symmetrically with respect to the center of the main shaft 3. Specifically, the two ends of the main shaft 3 are rotatably connected to the two support bodies 2 through the two sets of bearing assemblies 8, which support the main shaft 3, reduce the frictional resistance of the main shaft 3, and improve the rotational accuracy of the main shaft 3. With this arrangement, the two support points of the traction sheave 4 are equidistant from the center of the main shaft 3, and the applied load is also consistent. The force generated by the main shaft 3 in the axial direction is consistent, avoiding vibration due to uneven force distribution, and further reducing the noise of the traction machine 100.

[0070] In some embodiments, the traction sheave 4 further includes a rotating wheel 42, with two second support members 41 respectively installed at both ends of the rotating wheel 42. The outer wall of the rotating wheel 42 has a rope groove 421. The second support members 41 have an annular structure, and the outer diameter of the second support members 41 is larger than the outer diameter of the rotating wheel 42. A clearance groove 43 is formed between the inner sides of the two second support members 41 and the outer wall of the rotating wheel 42. Specifically, when the traction machine 100 is assembled, the traction rope needs to be wound in the rope groove 421 of the rotating wheel 42. During the process of the traction machine 100 pulling the car, the clearance groove 43 allows the traction rope to move, avoiding interference with the traction rope, and also providing a certain installation space for the traction rope to be assembled on the traction sheave 4.

[0071] Furthermore, with the symmetrically arranged traction machine 100, only a brake disc 52, a winding traction rope, and a rotor permanent magnet 72 need to be installed on its traction sheave 4. The rotor permanent magnets 72 of the two sets of motor assemblies 7 are respectively set at both ends of the traction sheave 4. This structure can make the axial distance of the traction sheave 4 shorter, further shortening the axial dimension of the traction machine 100.

[0072] In addition, an encoder 9 is located at either end of the main shaft 3. The main function of the encoder 9 is to convert the mechanical motion of the traction machine 100 into electrical signals for functions such as speed control, position positioning, and safety monitoring of the elevator. Through the electrical signals generated by the encoder 9, the elevator control system can monitor the elevator's operating status in real time, ensuring the safe, accurate, and efficient operation of the elevator.

[0073] The present invention also proposes an assembly method for a traction machine 100, characterized by comprising the following steps:

[0074] Step 1: Install one set of motor assemblies 7 onto one of the support bodies 2 and the first end of the traction sheave 4; install the other set of motor assemblies 7 onto another support body 2 and the second end of the traction sheave 4.

[0075] Step 2: The traction sheave 4 is sleeved on the main shaft 3, and the two ends of the main shaft 3 are respectively inserted into the through holes of the two support bodies 2 so that the main shaft 3 and the support bodies 2 can rotate together.

[0076] Two sets of motors 7 are respectively set at both ends of the main shaft 3 and are symmetrically arranged with respect to the center of the main shaft 3. In the production of the traction machine 100, through the symmetrical arrangement, each component of the traction machine 100, such as the main shaft 3 and the traction wheel 4, is symmetrical. Moreover, the two supporting bodies 2 have the same structure. Furthermore, through the above assembly method, the traction machine 100 can be quickly assembled, so that the assembled traction machine 100 is in a relatively symmetrical structure as a whole.

[0077] It should be noted that in this traction machine 100, by setting two sets of motor assemblies 7 and two support bodies 2, and rotatably connecting both ends of the main shaft 3 to the two support bodies 2, the traction sheave 4 is sleeved outside the main shaft 3, thus achieving a relatively symmetrical overall structure for the traction machine 100. In other traction machines 100, the method of setting two sets of motor assemblies 7 and two support bodies 2, with both ends of the main shaft 3 rotatably connected to the two support bodies 2 respectively, is also within the scope of protection of this application.

[0078] When referencing drawings, new features are explained. To avoid redundant references to drawings that would make the description less concise, features already described will not be referenced again on the drawings if the description is clear.

[0079] The purpose of the above embodiments is to reproduce and derive the technical solution of the present invention by way of example, and to fully describe the technical solution, purpose and effect of the present invention. The purpose is to enable the public to have a more thorough and comprehensive understanding of the disclosure of the present invention, and not to limit the scope of protection of the present invention.

[0080] The above embodiments are not an exhaustive list based on the present invention, and there may be many other embodiments not listed. Any substitutions and improvements made without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A traction machine with dual motors, characterized in that, It includes a traction sheave, a heat sink, a main shaft, two support bodies, and two sets of motor assemblies. The two support bodies are respectively located at both ends of the traction sheave. One motor assembly is installed between the first end of the traction sheave and one of the support bodies, and the other motor assembly is installed between the second end of the traction sheave and the other support body. Two support bodies are respectively sleeved on both ends of the main rotating shaft, and the main rotating shaft is rotatably engaged with the support bodies; the traction sheave is sleeved on the outside of the main rotating shaft and fixed to the main rotating shaft; The traction sheave is symmetrically arranged with respect to the center of the main shaft, and the two support points between the main shaft and the traction sheave are symmetrically arranged with respect to the center of the main shaft. The support body and the traction wheel have a first heat dissipation channel and a first heat dissipation hole. The heat dissipation component is installed on the outer wall of the support body. The air outlet direction of the heat dissipation component is towards the first end of the first heat dissipation channel. The second end of the first heat dissipation channel is connected to the first heat dissipation hole. The support body and the traction sheave are also provided with a second heat dissipation channel and a second heat dissipation hole. The first heat dissipation channel is connected to the second heat dissipation channel, and the second heat dissipation channel is connected to the second heat dissipation hole.

2. The traction machine as described in claim 1, characterized in that, The supporting body has a first supporting member, which is bent and has a first sidewall and a second sidewall. The traction sheave has a second support member, which is disposed close to the first side wall and the second side wall, and the inner side of the second support member forms a mounting groove between the first side wall and the second side wall. The motor assembly includes a stator core and a rotor permanent magnet. The stator core is mounted on a first side wall, and the rotor permanent magnet is mounted on the inner side of a second support member. Both the stator core and the rotor permanent magnet are disposed in mounting slots, with the rotor permanent magnet positioned close to the stator core.

3. The traction machine as described in claim 2, characterized in that, The first support member includes a first support portion and a second support portion, the first support portion and the second support portion are fixed together to form an L-shaped structure; The outer surface of the first support portion forms a first sidewall, and the outer surface of the second support portion forms a second sidewall, with the first sidewall and the second sidewall being disposed adjacent to each other.

4. The traction machine as described in claim 3, characterized in that, The first support part has a hollow columnar structure, and the second support part has a hollow disc-shaped structure; The outer diameter of the second support is larger than the outer diameter of the first support.

5. The traction machine as described in claim 3, characterized in that, The traction machine also includes a brake and a bearing assembly. The bearing assembly is mounted on the first support and is sleeved on the main shaft. The main shaft is rotatably connected to the first support through the bearing assembly. The brake is mounted on the second support.

6. The traction machine as described in claim 5, characterized in that, The brake includes a brake disc, brake pads, and a brake core. The brake core is movably mounted on a second support. The brake disc is mounted on the side wall of the second support. The brake pads are mounted on the brake core and are positioned close to the brake disc to abut against it.

7. The traction machine as described in claim 5, characterized in that, The bearing assembly includes a bearing and two sealing caps. The bearing is sleeved on the outside of the main rotating shaft, and both sealing caps are sleeved on the outside of the main rotating shaft, with the two sealing caps respectively located at both ends of the bearing. The outer ring of the bearing is fixed to the first support portion, and the inner ring of the bearing is fixed to the main shaft.

8. The traction machine as described in claim 5, characterized in that, The bearing assembly has two sets, and the two sets of bearing assemblies are respectively sleeved on both ends of the main rotating shaft; The two sets of bearing assemblies are respectively installed on the two support bodies, and the two sets of bearing assemblies are arranged symmetrically with respect to the center of the main shaft.

9. The traction machine as described in claim 2, characterized in that, The traction sheave also has a rotating wheel, with two second support members respectively installed at both ends of the rotating wheel, and the outer wall of the rotating wheel has rope grooves; The second support member has a ring-shaped structure, and the outer diameter of the second support member is larger than the outer diameter of the rotating wheel. A clearance groove is formed between the inner sides of the two second support members and the outer wall of the rotating wheel.

10. The assembly method of the traction machine according to claim 1, characterized in that, Includes the following steps: One set of motor assemblies is installed on one of the support bodies and the first end of the traction sheave; the other set of motor assemblies is installed on another support body and the second end of the traction sheave. The traction sheave is sleeved on the main shaft, and the two ends of the main shaft are respectively inserted into the through holes of the two support bodies so that the main shaft and the support bodies can rotate together.

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