Elevator Traction Driven by a Dual-Motor Drive Device

Abstract

The present invention discloses an elevator towed by a dual-motor drive device. The dual-motor drive device can output a relatively large torque to increase the traction force of the traction rope, and can meet the needs of applications for elevators with large load capacities.

Description

Technical Field

[0001] The present invention relates to the field of elevators, and particularly to an elevator driven by a dual-motor drive device. Background Art

[0002] In the application scenarios of elevators for lifting large payloads, in order to meet the traction force requirements and ensure that the traction ropes have a sufficient service life, traction ropes with a larger diameter are usually used. According to the requirements of Clause 5.5.2 in the Chinese elevator standard GB / T 7588.1-2020, the ratio (D / d) of the pitch circle diameter D of traction rope wheels such as traction wheels, pulleys, and drums to the diameter d of the traction rope (suspension steel wire rope) should not be less than 40. Therefore, after using traction ropes with a larger diameter, traction rope wheels with a correspondingly larger pitch circle diameter need to be used, which requires the drive device to be able to output a larger torque.

[0003] In order to output a larger torque, a dual-motor drive device can be used to achieve this. For example, Chinese Patent Gazette CN1092132C discloses a dual-motor drive device. The traction rope wheel is arranged between the two motors, and the rotors of the two motors directly drive the rope wheel. In order to output a larger torque, the diameters of the two rotors are both larger than the rope wheel, making the sizes and volumes of the two motors larger, resulting in the large size and volume of the drive device; both motors use axial magnetic fields, and an additional adjustment device needs to be set to adjust the positions of the respective rotors relative to the frame (stator). It is necessary to try to adjust the two motors to have the same air gap value to reduce the adverse effects brought by the imbalance of the axial magnetic field forces of the two motors, and it is necessary to try to adjust the two motors to have the same electric drive, making the assembly of the drive device complicated and costly.

[0004] The large size and volume of the drive device increase the difficulty of manufacturing the components of the drive device. At the same time, the large-sized drive device occupies more space at the elevator use site, and also brings many difficulties to the handling, installation, and maintenance of the elevator on site. The complexity of the drive device assembly reduces the manufacturing efficiency and increases the manufacturing cost. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an elevator driven by a dual-motor drive device, which can output a larger torque by using a miniaturized dual-motor drive device, use a traction rope wheel with a larger diameter and a traction rope with a larger diameter to increase the traction force of the traction rope, and meet the requirements of the application scenarios of elevators for lifting large payloads. Using a miniaturized dual-motor drive device can not only reduce the occupied space, facilitate handling, installation layout, and maintenance, but also bring more convenience to the manufacturing of components, is conducive to saving raw materials and reducing processing time. At the same time, the motor adopts a cylindrical structure with a radial magnetic field, eliminating the assembly time required for adjusting the axial magnetic field force, reducing the complexity of component assembly, and reducing the manufacturing cost of assembly.

[0006] To solve the above technical problems, an elevator towed by a dual-motor drive device provided by the present invention has:

[0007] A car and a counterweight are provided in the lifting space for lifting; a towing rope suspends the car and the counterweight; a towing rope wheel is driven by a first motor drive device and a second motor drive device arranged on both sides of it to rotate, driving the towing rope to lift and lower the car and the counterweight.

[0008] The first motor drive device has a first motor and a first gear assembly;

[0009] The second motor drive device has a second motor and a second gear assembly;

[0010] Along the axial direction of the towing rope wheel, the towing rope wheel is located between the first motor drive device and the second motor drive device; the torque generated by the first motor of the first motor drive device is transmitted to the towing rope wheel through the first gear assembly, and the torque generated by the second motor of the second motor drive device is transmitted to the towing rope wheel through the second gear assembly, driving the towing rope wheel to rotate.

[0011] Preferably, the towing rope wheel combined with the towing rope has a pitch circle of the towing rope wheel;

[0012] The projections of the respective transmission gears of the first gear assembly and the respective transmission gears of the second gear assembly along the axial direction of the towing rope wheel are all arranged within the area surrounded by the projection of the pitch circle of the towing rope wheel along the axial direction of the towing rope wheel.

[0013] Preferably, the axes of the respective transmission gears of the first gear assembly and the axes of the respective transmission gears of the second gear assembly are all parallel to the axis of the towing rope wheel.

[0014] Preferably, the axes of the respective transmission gears of the first gear assembly and the axes of the respective transmission gears of the second gear assembly are all stationary relative to the axis of the towing rope wheel and parallel to the axis of the towing rope wheel.

[0015] Preferably, the axes of the respective transmission gears of the first gear assembly and the axes of the respective transmission gears of the second gear assembly are all stationary relative to the axis of the towing rope wheel and parallel to the axis of the towing rope wheel; the projections of the axes of the respective transmission gears of the first gear assembly and the axes of the respective transmission gears of the second gear assembly along the axial direction of the towing rope wheel are arranged within the area surrounded by the projection of the pitch circle of the towing rope wheel along the axial direction of the towing rope wheel.

[0016] Preferably, along the axial direction of the towing rope wheel, the respective transmission gears of the first gear assembly are all located between the towing rope wheel and the first motor;

[0017] Along the axial direction of the traction rope wheel, each transmission gear of the second gear assembly is located between the traction rope wheel and the second motor.

[0018] Preferably, each transmission gear of the first gear assembly and each transmission gear of the second gear assembly are helical gears.

[0019] Preferably, the second motor drive device has the same structure as the first motor drive device;

[0020] The second motor has the same structure as the first motor;

[0021] The second gear assembly has the same structure as the first gear assembly.

[0022] Preferably, the first gear assembly has N transmission gears, and the axes of the N transmission gears are not in the same plane and are arranged in a three-dimensional manner in space, where N is an integer greater than 2.

[0023] Preferably, the first motor drive device further has a first gearbox, and each transmission gear of the first gear assembly is arranged in the first gearbox, and the first gearbox supports the rotation of each transmission gear of the first gear assembly.

[0024] Preferably, the first gear assembly includes an input transmission gear, an output transmission gear, a first intermediate transmission gear, and a second intermediate transmission gear;

[0025] The input transmission gear is provided with an input rotating shaft, and the input rotating shaft is provided with a first bearing and a second bearing;

[0026] The output transmission gear is provided with an output rotating shaft, and the output rotating shaft has a third bearing and a fourth bearing;

[0027] The first intermediate transmission gear, the second intermediate transmission gear, and the intermediate transmission rotating shaft are coaxially connected and rotate integrally;

[0028] The intermediate transmission rotating shaft is provided with a fifth bearing and a sixth bearing;

[0029] The first gearbox supports the rotation of each rotating shaft through the bearings of each rotating shaft.

[0030] Preferably, the first motor adopts a cylindrical structure with a radial magnetic field, having: a stationary part, a rotating part; the rotating part of the first motor is coaxially connected and rotates integrally with the input transmission gear of the first gear assembly, the traction rope wheel is coaxially connected and rotates integrally with the output transmission gear of the first gear assembly, and the rotational speed of the traction rope wheel is less than the rotational speed of the rotating part of the first motor.

[0031] Preferably, the number of teeth of the input drive gear is less than that of the drive gear meshing with it, and the number of teeth of the output drive gear is greater than that of the drive gear meshing with it.

[0032] Preferably, the projection of the rotating part of the first motor along the axial direction of the traction sheave is arranged within the area surrounded by the projection of the pitch circle of the traction sheave along the axial direction of the traction sheave.

[0033] Preferably, the stationary part of the first motor has a coil, and the projection of the coil along the axial direction of the traction sheave is arranged within the area surrounded by the projection of the pitch circle of the traction sheave along the axial direction of the traction sheave.

[0034] For the elevator towed by the motor drive device of the present invention, by adopting a miniaturized dual-motor drive device to output a larger torque, it can meet the requirement of the Chinese elevator standard GB / T 7588.1-2020 that the ratio (D / d) of the diameter of the pitch circle of the traction sheave to the diameter of the traction rope should not be less than 40. Under this requirement, a larger-diameter traction sheave and a larger-diameter traction rope can be used to increase the traction force of the traction rope and ensure that the traction rope has a sufficient service life, meeting the needs of the application scenarios of elevators with a large load capacity. Using a miniaturized dual-motor drive device can not only reduce the occupied space, facilitate handling, installation, layout and maintenance, but also bring more convenience to the production of components, which is beneficial to saving raw materials and reducing processing time. At the same time, the motor adopts a cylindrical structure with a radial magnetic field, eliminating the assembly time required for adjusting the axial magnetic force, reducing the complexity of component assembly, and reducing the manufacturing cost of assembly. And the miniaturized dual-motor drive device reduces the occupied civil engineering size space, and at the same time brings more convenience to the handling, installation and maintenance of the elevator on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the present invention, the following briefly introduces the drawings required for the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0036] Figure 1 is a three-dimensional schematic diagram of an embodiment of an elevator towed by the dual-motor drive device of the present invention;

[0037] Figure 2 is Figure 1 a three-dimensional schematic diagram of the first motor, the first gear assembly, the traction sheave of the first motor drive device, and the second motor drive device;

[0038] Figure 3 is Figure 1Side view of the first motor, the first gear assembly, the traction sheave, the traction rope, and the second motor drive device of the first motor drive device;

[0039] Figure 4 is Figure 3 C-C cross-sectional view of;

[0040] Figure 5 is Figure 1 Schematic three-dimensional view of the external shape of the first motor drive device, the traction sheave, and the second motor drive device of;

[0041] Figure 6 is Figure 1 Rear view of the first motor drive device, the traction sheave, and the second motor drive device of;

[0042] Figure 7 is Figure 1 Side view of the first motor drive device, the traction sheave, and the second motor drive device of;

[0043] Figure 8 is Figure 7 A-A cross-sectional view of;

[0044] Figure 9 is Figure 7 B-B cross-sectional view of;

[0045] Figure 10 is Figure 5 Schematic three-dimensional view of the first motor drive device with the first gearbox omitted;

[0046] The reference numerals are explained as follows:

[0047] 1 First motor drive device; 2 First gear assembly; 10 First motor; 11 Stationary part of the first motor; 12 Rotating part of the first motor; 20 First gearbox; 21 Input rotating shaft; 22 Output rotating shaft; 23 Intermediate transmission rotating shaft; 30 Traction sheave; 110 Motor housing; 111 Stator core; 112 Coil; 210 Input transmission gear; 211 Axis of the input rotating shaft; 212 First bearing; 213 Second bearing; 220 Output transmission gear; 221 Axis of the output rotating shaft; 222 Third bearing; 223 Fourth bearing; 230 First intermediate transmission gear; 231 Second intermediate transmission gear; 232 Axis of the transmission rotating shaft; 233 Fifth bearing; 234 Sixth bearing; 310 Pitch circle of the traction sheave; 320 Axis of the traction sheave; 1000 Elevator; 1001 Hoistway; 1002 Car; 1003 Wheel; 1008 Traction rope end connection device on the car side; 1009 Traction rope end connection device on the counterweight side; 2001 Second motor drive device; 2002 Second gear assembly; 2010 Second motor; D Pitch circle diameter of the traction sheave; d Diameter of the traction rope. Detailed Implementation Modes

[0048] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0049] Embodiment 1

[0050] As Figures 1 - 10 shown, an elevator towed by a dual-motor drive device has:

[0051] A lifting space (1001);

[0052] A car (1002) and a counterweight (1003) that move up and down in the lifting space;

[0053] A traction rope (1004) that suspends the car (1002) and the counterweight (1003);

[0054] The traction rope wheel (30) combined with the traction rope (1004) has a traction rope wheel pitch circle (310); the rotational movement of the traction rope wheel (30) causes the car (1002) and the counterweight (1003) to move up and down through the traction rope (1004).

[0055] A first motor drive device (1), having: a first motor (10), a first gear assembly (2);

[0056] A second motor drive device (2001), having: a second motor (2010), a second gear assembly (2002);

[0057] Along the axial direction of the traction rope wheel (30), the traction rope wheel (30) is located between the first motor drive device (1) and the second motor drive device (2001); the torque generated by the first motor (10) of the first motor drive device is transmitted to the traction rope wheel (30) through the first gear assembly (2), and the torque generated by the second motor (2010) of the second motor drive device is transmitted to the traction rope wheel (30) through the second gear assembly (2002), driving the traction rope wheel (30) to perform a rotational movement.

[0058] As Figures 2 - 4 shown, the diameter of the traction rope wheel pitch circle 310 is D, and the diameter of the traction rope 1004 is d. Preferably, the diameter ratio D / d should not be less than 40. The traction rope 1004 converts the rotational movement of the traction rope wheel 30 into the up and down movement of the car 1002 and the counterweight 1003 through its combination with the traction rope wheel 30.

[0059] Preferably, the projections of the transmission gears of the first gear assembly (2) and the projections of the transmission gears of the second gear assembly (2002) in the axial direction of the traction rope wheel (30) are all arranged within the area enclosed by the projection of the traction rope wheel pitch circle (310) in the axial direction of the traction rope wheel (30).

[0060] Preferably, the axes of the transmission gears of the first gear assembly (2) and the axes of the transmission gears of the second gear assembly (2002) are all stationary relative to the axis (320) of the traction rope wheel (30) and are parallel to the axis (320) of the traction rope wheel (30).

[0061] In the axial direction of the traction rope wheel (30), each transmission gear of the first gear assembly (2) is located between the traction rope wheel (30) and the first motor (10);

[0062] In the axial direction of the traction rope wheel (30), each transmission gear of the second gear assembly (2002) is located between the traction rope wheel (30) and the second motor (2010).

[0063] Preferably, the transmission gears of the first gear assembly (2) and the transmission gears of the second gear assembly (2002) are all helical gears.

[0064] For the elevator towed by the dual-motor drive device of this embodiment, through the reasonable arrangement of the two motors, the two gear assemblies and the traction rope wheel, a compact layout of the drive device is achieved, and by adopting helical gear transmission, it is beneficial for the drive device to output a stable and relatively large torque, which is beneficial for the miniaturization of the drive device. The miniaturized drive device can not only reduce the occupied space, facilitate handling, installation and layout, and maintenance, but also bring more convenience to the manufacturing of parts, which is beneficial for saving raw materials, reducing the processing and assembly time, and reducing the manufacturing cost of parts.

[0065] Embodiment 2

[0066] The difference between this embodiment and Embodiment 1 is as follows:

[0067] As Figures 1 - 10 shown, the axes of the transmission gears of the first gear assembly (2) and the axes of the transmission gears of the second gear assembly (2002) are all stationary relative to the axis (320) of the traction rope wheel (30) and are parallel to the axis (320) of the traction rope wheel (30); the projections of the axes of the transmission gears of the first gear assembly (2) and the projections of the axes of the transmission gears of the second gear assembly (2002) in the axial direction of the traction rope wheel (30) are arranged within the area enclosed by the projection of the traction rope wheel pitch circle (310) in the axial direction of the traction rope wheel (30).

[0068] In the elevator towed by the dual-motor drive device of this embodiment, through further reasonable configuration of each transmission gear of the gear assembly and miniaturization design of the transmission gears, etc., the dual-motor drive device can be further miniaturized.

[0069] Embodiment III

[0070] As Figures 1 - 10 shown, for the elevator towed by the dual-motor drive device based on Embodiment I, the second motor drive device (2001) has the same structure as the first motor drive device (1);

[0071] The second motor (2010) has the same structure as the first motor (10);

[0072] The second gear assembly (2002) has the same structure as the first gear assembly (2).

[0073] In the elevator towed by the dual-motor drive device of this embodiment, by adopting two motor drive devices with the same structure, two motors with the same structure, and two gear assemblies with the same structure, the number of different components can be reduced, which is convenient for the production and assembly of components, reduces the production cost, and is convenient for on-site maintenance and replacement operations.

[0074] Embodiment IV

[0075] As Figures 1 - 10 shown, for the elevator towed by the dual-motor drive device based on Embodiment III, the first gear assembly (2) has N transmission gears, and the axes of the N transmission gears are not in the same plane and are arranged three-dimensionally in space, where N is an integer greater than 2.

[0076] The first motor drive device (1) further has a first gearbox (20), and each transmission gear of the first gear assembly (2) is arranged in the first gearbox (20), and the first gearbox (20) supports the rotation of each transmission gear of the first gear assembly (2).

[0077] The first gear assembly (2) includes an input transmission gear (210), an output transmission gear (220), a first intermediate transmission gear (230) and a second intermediate transmission gear (231);

[0078] The input transmission gear (210) is provided with an input rotating shaft (21), and the input rotating shaft (21) is provided with a first bearing (212) and a second bearing (213);

[0079] The output transmission gear (220) is provided with an output rotating shaft (22), and the output rotating shaft (22) has a third bearing (222) and a fourth bearing (223);

[0080] The first intermediate drive gear (230), the second intermediate drive gear (231), and the intermediate drive rotating shaft (23) are coaxially connected and rotate integrally;

[0081] The intermediate drive rotating shaft (23) is provided with a fifth bearing (233) and a sixth bearing (234);

[0082] The first gearbox (20) rotatably supports each rotating shaft through the bearings of each rotating shaft.

[0083] The number of teeth of the input drive gear (210) is less than the number of teeth of the drive gear meshing therewith, and the number of teeth of the output drive gear (220) is greater than the number of teeth of the drive gear meshing therewith, so as to achieve speed reduction and increase the output torque.

[0084] For the elevator towed by the motor drive device of this embodiment, by adopting a three-dimensional layout for the gear assembly, the gear layout space is reduced, a compact layout of the gear positions is achieved, and the output torque is increased through the reduction gear assembly, which is beneficial to reducing the size and volume of the small-sized motor and further miniaturizing the drive device.

[0085] Embodiment Five

[0086] As Figures 1 - 10 shown, for the elevator towed by the dual-motor drive device based on Embodiment Four, the first motor (10) adopts a cylindrical structure with a radial magnetic field and has: a stationary part (11) and a rotating part (12); the rotating part (12) of the first motor is coaxially connected and rotates integrally with the input drive gear (210) of the first gear assembly (2), the traction sheave (30) is coaxially connected and rotates integrally with the output drive gear (220) of the first gear assembly (2), and the rotational speed of the traction sheave (30) is less than the rotational speed of the rotating part (12) of the first motor.

[0087] The projection of the rotating part (12) of the first motor in the axial direction of the traction sheave (30) is arranged within the area surrounded by the projection of the traction sheave pitch circle (310) in the axial direction of the traction sheave (30).

[0088] The stationary part (11) of the first motor has a stator core (111) and a coil (112), and the projection of the coil (112) in the axial direction of the traction sheave (30) is arranged within the area surrounded by the projection of the traction sheave pitch circle (310) in the axial direction of the traction sheave (30).

[0089] Preferably, the stationary part 11 of the motor has a motor housing 111, and the motor housing 111 and the first gearbox 20 are integrally designed.

[0090] When the coil 112 is energized, the stationary part 11 of the first motor generates an electromagnetic field to drive the rotating part 12 of the first motor. The output torque is transmitted to the traction sheave 30 through the input rotating shaft 21, the input transmission gear 210, the first intermediate transmission gear 230, the intermediate transmission rotating shaft 23, the second intermediate transmission gear 231, the output transmission gear 220, and the output rotating shaft 22.

[0091] The second motor (2010) has the same structure as the first motor (10), and the second gear assembly (2002) has the same structure as the first gear assembly (2). In the same way as the above torque transmission method, the torque generated by the second motor (2010) is also transmitted to the traction sheave (30) through the second gear assembly (2002), jointly driving the traction sheave (30) to perform a rotational motion.

[0092] For the elevator towed by the dual-motor drive device of this embodiment, both motors adopt a cylindrical structure with a radial magnetic field, eliminating the assembly time required for adjusting the axial magnetic force, reducing the complexity of component assembly, and reducing the manufacturing cost of assembly. At the same time, by using miniaturized motor components, the drive device is further miniaturized.

[0093] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An elevator towed by a dual-motor drive device, characterized in that, Comprising: A lifting car (1002) and a counterweight (1003) are arranged in a lifting space (1001); The car (1002) and the counterweight (1003) are suspended by a traction rope (1004); A traction rope wheel (30) is driven to rotate by a first motor driving device (1) and a second motor driving device (2001) arranged on both sides thereof, and the traction rope (1004) is driven to lift the car (1002) and the counterweight (1003); The first motor driving device (1) has a first motor (10) and a first gear assembly (2); The second motor driving device (2001) has a second motor (2010) and a second gear assembly (2002); Along the axial direction of the traction rope wheel (30), the traction rope wheel (30) is located between the first motor driving device (1) and the second motor driving device (2001); the torque generated by the first motor (10) of the first motor driving device is transmitted to the traction rope wheel (30) through the first gear assembly (2), and the torque generated by the second motor (2010) of the second motor driving device is transmitted to the traction rope wheel (30) through the second gear assembly (2002), driving the traction rope wheel (30) to perform a rotational motion; The axes of the transmission gears of the first gear assembly (2) and the axes of the transmission gears of the second gear assembly (2002) are all stationary relative to the axis (320) of the traction rope wheel (30) and are parallel to the axis (320) of the traction rope wheel (30); the projections of the axes of the transmission gears of the first gear assembly (2) and the projections of the axes of the transmission gears of the second gear assembly (2002) along the axial direction of the traction rope wheel (30) are arranged in the area surrounded by the projection of the pitch circle (310) of the traction rope wheel along the axial direction of the traction rope wheel (30).

2. The elevator driven by a dual-motor driving device according to claim 1, wherein The traction rope wheel (30) combined with the traction rope (1004) has a traction rope wheel pitch circle (310); The projections of the transmission gears of the first gear assembly (2) and the projections of the transmission gears of the second gear assembly (2002) along the axial direction of the traction rope wheel (30) are all arranged in the area surrounded by the projection of the pitch circle (310) of the traction rope wheel along the axial direction of the traction rope wheel (30).

3. The elevator driven by a dual-motor driving device according to claim 2, wherein The axes of the transmission gears of the first gear assembly (2) and the axes of the transmission gears of the second gear assembly (2002) are all parallel to the axis (320) of the traction rope wheel (30).

4. The elevator driven by a dual-motor driving device according to claim 1, wherein Along the axial direction of the traction rope wheel (30), the transmission gears of the first gear assembly (2) are all located between the traction rope wheel (30) and the first motor (10); Along the axial direction of the traction rope wheel (30), the transmission gears of the second gear assembly (2002) are all located between the traction rope wheel (30) and the second motor (2010).

5. The elevator towed by the dual-motor drive device according to claim 4, wherein each transmission gear of the first gear assembly (2) and each transmission gear of the second gear assembly (2002) are helical gears.

6. The elevator towed by the dual-motor drive device according to claim 5, wherein the second motor drive device (2001) has the same structure as the first motor drive device (1); the second motor (2010) has the same structure as the first motor (10); the second gear assembly (2002) has the same structure as the first gear assembly (2).

7. The elevator towed by the dual-motor drive device according to claim 6, wherein the first gear assembly (2) has N transmission gears, the axes of the N transmission gears are not in the same plane and are arranged in a three-dimensional manner in space, and N is an integer greater than 2.

8. The elevator towed by the dual-motor drive device according to claim 6, wherein the first motor drive device (1) further has a first gearbox (20), each transmission gear of the first gear assembly (2) is arranged in the first gearbox (20), and the first gearbox (20) supports the rotation of each transmission gear of the first gear assembly (2).

9. The elevator towed by the dual-motor drive device according to claim 8, wherein the first gear assembly (2) includes an input transmission gear (210), an output transmission gear (220), a first intermediate transmission gear (230) and a second intermediate transmission gear (231); the input transmission gear (210) is provided with an input rotating shaft (21), and the input rotating shaft (21) is provided with a first bearing (212) and a second bearing (213); the output transmission gear (220) is provided with an output rotating shaft (22), and the output rotating shaft (22) has a third bearing (222) and a fourth bearing (223); the first intermediate transmission gear (230), the second intermediate transmission gear (231) and the intermediate transmission rotating shaft (23) are coaxially connected and rotate integrally; the intermediate transmission rotating shaft (23) is provided with a fifth bearing (233) and a sixth bearing (234); the first gearbox (20) supports the rotation of each rotating shaft through the bearings of each rotating shaft.

10. The elevator towed by the dual-motor drive device according to claim 9, wherein the first motor (10) adopts a cylindrical structure with a radial magnetic field, and has: a stationary part (11) and a rotating part (12); the rotating part (12) of the first motor is coaxially connected and rotates integrally with the input transmission gear (210) of the first gear assembly (2), and the traction rope wheel (30) is coaxially connected and rotates integrally with the output transmission gear (220) of the first gear assembly (2), and the rotational speed of the traction rope wheel (30) is less than the rotational speed of the rotating part (12) of the first motor.

11. The elevator towed by the motor drive device according to claim 10, wherein The number of teeth of the input transmission gear (210) is less than that of the transmission gear meshing with it, and the number of teeth of the output transmission gear (220) is greater than that of the transmission gear meshing with it.

12. The elevator towed by the motor drive device according to claim 10, wherein The projection of the rotating part (12) of the first motor in the axial direction of the traction sheave (30) is arranged within the area surrounded by the projection of the pitch circle (310) of the traction sheave in the axial direction of the traction sheave (30).

13. The elevator towed by the motor drive device according to claim 10, wherein The stationary part (11) of the first motor has a coil (112), and the projection of the coil (112) in the axial direction of the traction sheave (30) is arranged within the area surrounded by the projection of the pitch circle (310) of the traction sheave in the axial direction of the traction sheave (30).

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