WO2021072902A1

WO2021072902A1 - Alternating-current asynchronous gearless variable-speed traction machine and elevator system

Info

Publication number: WO2021072902A1
Application number: PCT/CN2019/119837
Authority: WO
Inventors: 朱建新; 戴跃根; 张陈; 林云发
Original assignee: 苏州台菱电梯有限公司
Priority date: 2019-10-16
Filing date: 2019-11-21
Publication date: 2021-04-22
Also published as: CN110562830A

Abstract

Disclosed are an alternating-current asynchronous gearless variable-speed traction machine and an elevator system. The traction machine comprises a three-phase asynchronous electric motor, and a traction sheave (1) fixed on an output shaft (6) of the three-phase asynchronous electric motor. An encoder (10) and a brake (9) which is used for braking the traction sheave (1) are further arranged on the three-phase asynchronous electric motor, the three-phase asynchronous electric motor comprises a stator shell (3), a stator (4) arranged in the stator shell (3), and a rotor (5) arranged on an outer ring of the output shaft (6), a front end cover (2) and a rear end cover (8) are arranged at two ends of the stator shell (3) respectively, and the brake (9) and the encoder (10) are installed on the rear end cover (8). The traction machine is resistant to high temperatures, simple in structure, convenient to assemble, low in price, environmentally friendly and convenient to install and maintain on site.

Description

AC asynchronous gearless variable speed traction machine and elevator system

Technical field

The application relates to an AC asynchronous gearless variable speed traction machine and an elevator system.

Background technique

The traditional AC gearless traction machine is a permanent magnet synchronous gearless traction machine. Its disadvantage is that a large number of permanent magnets containing rare earth materials are used, which is expensive, serious environmental pollution, and there is a risk of high temperature demagnetization. Because of the strong magnetic magnets attached to the surface of the rotor Steel, the assembly process is complicated, the on-site after-sales cannot be disassembled and repaired.

Summary of the invention

The technical problem to be solved by this application is to provide an AC asynchronous gearless variable speed traction machine and elevator system.

In order to solve the above technical problems, this application provides an AC asynchronous gearless variable speed traction machine. The traction machine includes a three-phase asynchronous motor and a traction sheave fixed on the output shaft of the three-phase asynchronous motor. The three-phase asynchronous motor is also installed with an encoder and a brake that brakes the traction sheave. The three-phase asynchronous motor includes a stator housing, a stator arranged in the stator housing, and an output shaft For the rotor of the outer ring, a front end cover and a rear end cover are respectively provided at both ends of the stator housing, and the brake and the encoder are installed on the rear end cover.

Preferably, the stator is composed of a stator core and enameled copper wire.

Preferably, the rotor is a cast aluminum rotor.

Preferably, a bearing for supporting the output shaft is provided on the rear end cover.

Preferably, the output shaft extends from the front end cover, and the traction wheel is located at a position of the output shaft close to the front end cover.

Preferably, the traction machine is connected to an elevator frequency converter.

Preferably, the wheel surface of the traction wheel is provided with a plurality of wheel grooves arranged in the circumferential direction.

Preferably, the cross section of the wheel groove is V-shaped, and the toilet surface of the wheel groove is provided with a buffer layer made of hard rubber material.

The application also provides an elevator system. The elevator system includes the traction machine, and the elevator system further includes a car.

Preferably, the car includes a car liner and a shell arranged outside the car liner, and a plurality of upper spring reducers are installed between the top wall of the car liner and the top plate of the shell. A vibrator, a plurality of lower spring dampers are arranged between the bottom wall of the car liner and the bottom plate of the outer shell, and a plurality of lower spring dampers are arranged between the side wall of the car and the side wall of the outer shell. A plurality of electromagnetic dampers and piston rods. The upper end of the piston rod is installed in the electromagnetic damper and can move up and down along the electromagnetic damper. The lower side of the bottom plate of the housing is also provided There is an impact plate, the lower end of the piston rod passes through the bottom plate of the housing and then is fixedly connected to the impact plate, the car also includes an air inflation system, and the air inflation system includes a mounting The inflator between the bottom wall of the outer shell and the bottom wall of the car liner, the airbag provided between the bottom plate of the outer shell and the impact plate, the inflator can inflate the airbag, so The upper surface of the impact plate is also provided with a plurality of mounting blocks that can be embedded into the lower surface of the bottom surface of the shell. The inflatable system has an inflated state and a folded state. When the inflatable system is in the folded state, the airbag is Folded between the shell bottom plate and the impact plate, the electromagnetic damper has no force on the piston rod, and the mounting block of the impact plate is embedded on the shell bottom plate; when the inflation system is inflated In the state, the airbag is in a bounced state when the inflator is inflated, and the impact plate is ejected downward relative to the bottom plate of the housing under the action of the airbag. When the piston rod is up and down relative to the electromagnetic damper When moving, it is subjected to the damping force of the electromagnetic damper.

Preferably, the car is also provided with a controller, an acceleration sensor for monitoring the acceleration of the car’s descent, a speed sensor for monitoring the descent speed of the car, and a controller for monitoring the bottom of the car and the bottom of the elevator shaft. Distance measuring sensor, when the acceleration of the car descent measured by the acceleration sensor is greater than the set acceleration, the declining speed of the car measured by the speed sensor is greater than the set speed, the distance between the bottom of the car and the bottom of the elevator shaft measured by the distance sensor When the distance is less than the set distance, the controller controls the inflator to inflate the airbag so that the inflation system is in an inflated state. When the inflatable system is in an inflated state, the controller controls the electromagnetic The damper forms a damping force on the piston rod.

The AC asynchronous gearless variable speed traction machine and elevator system of the present application, the AC asynchronous gearless traction machine, the stator assembly is composed of stator iron core and enameled copper wire, the rotor is cast aluminum rotor, high temperature resistance, structure Simple, easy to assemble, cheaper and environmentally friendly compared to permanent magnets. The rotor can be dismantled without special tools, which is convenient for on-site maintenance. It can be controlled by the existing elevator inverter, which has low noise and stable operation compared with permanent magnet traction machine.

With reference to the following description and drawings, specific implementations of the present application are disclosed in detail, and the ways in which the principles of the present application can be adopted are indicated. It should be understood that the scope of the implementation of the present application is not limited thereby. Within the spirit and scope of the terms of the appended claims, the implementation of the present application includes many changes, modifications and equivalents.

Features described and/or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or substituted for features in other embodiments .

It should be emphasized that the term "comprising/comprising" when used herein refers to the existence of a feature, a whole, a step or a component, but does not exclude the existence or addition of one or more other features, a whole, a step or a component.

Description of the drawings

The drawings described herein are only for explanatory purposes, and are not intended to limit the scope of the disclosure of the present application in any way. In addition, the shape and proportional size of each component in the figure are only illustrative, and are used to help the understanding of the present application, and do not specifically limit the shape and proportional size of each component of the present application. Under the teaching of this application, those skilled in the art can choose various possible shapes and proportional sizes according to specific conditions to implement this application.

Figure 1 is a schematic diagram of the structure of an AC asynchronous gearless variable speed traction machine.

Figure 2 is a schematic structural diagram of the car of the present application in a state where the airbag is not ejected.

Fig. 3 is a schematic structural diagram of the car of the present application in an airbag pop-up state.

Among them: 1. Traction wheel; 2. Front end cover; 3. Stator housing; 4. Stator; 5. Rotor; 6. Output shaft; 7. Bearing; 8. Rear cover; 9. Brake; 10. Encoder;

51. Car liner; 52. Shell; 53, Upper spring shock absorber; 54, Electromagnetic damper; 55, Lower spring shock absorber; 56, Piston rod; 57, Mounting block; 58, bottom plate; 59, Inflatable Device; 60. Airbag.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of them. Based on the implementation manners in this application, all other implementation manners obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or a central element may also exist. When an element is considered to be "connected" to another element, it can be directly connected to the other element or an intermediate element may be present at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only, and are not meant to be the only embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of this application. The terminology used in the specification of the application herein is only for the purpose of describing specific embodiments, and is not intended to limit the application. The term "and/or" as used herein includes any and all combinations of one or more related listed items.

As shown in the figure, this application provides an AC asynchronous gearless variable speed traction machine, characterized in that the traction machine includes a three-phase asynchronous motor, a traction machine fixed on the output shaft 6 of the three-phase asynchronous motor Pulley 1. The three-phase asynchronous motor is also equipped with an encoder 10 and a brake 9 for braking the traction sheave 1. The three-phase asynchronous motor includes a stator housing 3, The stator 4 in the stator housing 3, the rotor 5 arranged on the outer ring of the output shaft 6, the two ends of the stator housing 3 are respectively provided with a front end cover 2 and a rear end cover 8, the brake 9 and the code The device 10 is installed on the rear cover 8 described above. The stator 4 is composed of a stator core and enameled copper wires. The rotor 5 is a cast aluminum rotor 5. The rear end cover 8 is provided with a bearing 7 for supporting the output shaft 6. The output shaft 6 protrudes from the front end cover 2, and the traction sheave 1 is located at a position close to the front end cover 2 of the output shaft 6. The traction machine is connected to an elevator frequency converter. The wheel surface of the traction wheel 1 is provided with a plurality of wheel grooves arranged in the circumferential direction. The cross section of the wheel groove is V-shaped, and the toilet surface of the wheel groove is provided with a buffer layer made of hard rubber material.

An AC asynchronous gearless variable speed traction machine of the present application, an AC asynchronous gearless traction machine, the stator assembly is composed of a stator core and enameled copper wire, the rotor 5 is a cast aluminum rotor 5, which is resistant to high temperatures and has a simple structure. It is easy to assemble, cheaper and environmentally friendly compared to permanent magnet steel. The rotor 5 can be removed without special tools, which is convenient for on-site maintenance. It can be controlled by the existing elevator inverter, which has low noise and stable operation compared with permanent magnet traction machine.

The present application also provides a car. The car includes a car liner 51, a housing 52 provided outside the car liner 51, and the top wall of the car liner 51 and the housing 52 A plurality of upper spring dampers 53 are installed between the top plates of the car, and a plurality of lower spring dampers 55 are installed between the bottom wall of the car liner 51 and the bottom plate 58 of the outer shell 52,

A plurality of electromagnetic dampers 54 and a piston rod 56 are arranged between the side wall of the car and the side wall of the housing 52, and the upper end of the piston rod 56 is installed in the electromagnetic damper 54. And can move up and down along the electromagnetic damper 54. An impact plate is provided on the lower side of the bottom plate 58 of the housing 52. The lower end of the piston rod 56 passes through the bottom plate 58 of the housing 52. It is fixedly connected to the impact plate.

The car also includes an inflatable system. The inflatable system includes an inflator 59 installed between the bottom plate 58 of the outer shell 52 and the bottom wall of the inner liner 51 of the car, and is arranged on the outer shell 52. The airbag 60 between the bottom plate 58 and the impact plate, the inflator 59 can inflate the airbag 60. The upper surface of the impact plate is also provided with a plurality of mounting blocks 57 that can be inserted into the lower surface of the bottom plate 58 of the housing 52.

The inflatable system has an inflated state and a folded state. As shown in FIG. 2, when the inflatable system is in the folded state, the airbag 60 is folded between the bottom plate 58 of the housing 52 and the impact plate. The electromagnetic damper 54 has no force on the piston rod 56, and the mounting block 57 of the impact plate is embedded on the bottom plate 58 of the housing 52; as shown in FIG. 3, when the inflation system is in an inflated state , The airbag 60 is in a bounced state under the inflation of the inflator 59, the impact plate is ejected downward relative to the bottom plate 58 of the housing 52 under the action of the airbag 60, and when the piston rod 56 is opposite When the electromagnetic damper 54 moves up and down, it receives the damping force of the electromagnetic damper 54.

The said car is also provided with a controller, an acceleration sensor for monitoring the acceleration of the car's descent, a speed sensor for monitoring the descent speed of the car, and a measuring device for monitoring the distance between the bottom of the car and the bottom of the elevator shaft. Distance sensor,

When the descending acceleration of the car measured by the acceleration sensor is greater than the set acceleration, the descending speed of the car measured by the speed sensor is greater than the set speed, and the distance between the bottom of the elevator car and the bottom of the elevator shaft measured by the ranging sensor is less than the set distance The controller controls the inflator 59 to inflate the airbag 60 so that the inflation system is in an inflated state. When the inflation system is in an inflated state, the controller controls the electromagnetic damper 54 to The piston rod 56 forms a damping force.

In the present application, the electromagnetic damper 54 controls the formation of damping force by turning on and off the current.

When the car fails and falls at extreme speed, if the car falls directly to the bottom of the elevator shaft, it will cause heavy casualties to the people in the car.

The car of the present application is equipped with an inflating system. When the car is descending extremely fast and is about to touch the bottom of the elevator shaft, the airbag 60 can bounce off and play a buffering effect on the car.

Since the airbag 60 is provided outside the car, when the airbag 60 bounces, it will not cause damage to the people in the car due to the huge impact force.

There are usually sharp objects in the stairwell. Such sharp objects may cut the inflated airbag 60. In order to prevent this phenomenon, the airbag 60 is arranged between the bottom of the housing 52 and the impact plate, and the impact plate is in direct contact. Touching the bottom of the ladder well protects the inflated airbag 60 to prevent sharp objects in the ladder well from puncturing the airbag 60. In addition, the upper and lower surfaces that the airbag 60 touches are smooth surfaces (that is, the surface of the housing 52). The bottom and the upper surface of the impact plate), so that the airbag 60 receives uniform force, and maximizes the cushioning effect of the airbag 60.

The electromagnetic damper 54 provided in the present application can further play a buffering effect. The electromagnetic damper 54 conducts after the airbag 60 is opened. Therefore, during the process of opening the airbag 60, the electromagnetic damper 54 will not interfere with the piston rod 56. The damping force is generated without affecting the opening of the airbag 60.

After the airbag 60 is opened, the electromagnetic damper 54 is immediately in a conducting state. When the impact plate collides with the bottom of the stairwell, the electromagnetic damper 54 generates a damping force on the piston rod 56 to play a buffering effect.

In addition, since the piston rod 56 can only move up and down relative to the electromagnetic damper 54, it can limit the impact plate. When the airbag 60 is opened, the impact plate moves downward relative to the bottom of the housing 52. Due to the limitation of the piston rod 56 and the electromagnetic damper 54, the impact plate can always be in a horizontal position, preventing the impact plate from tilting due to uneven force. Balance the force of the entire car.

The electromagnetic damper 54 of the present application, the piston rod 56, the impact plate, and the inflation system interact to protect the car to the greatest extent when the car touches the ground at extreme speed.

The upper spring damper 53 and the lower spring damper 55 of the present application play a damping effect during the normal operation of the car, and can also play a buffering effect when the car crashes down and touches the ground at a high speed.

It should be noted that, in the description of the present application, unless otherwise specified, "multiple" means two or more than two.

All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of" describing a combination shall include the determined element, component, component or step and other elements, components, components or steps that do not substantially affect the basic novel characteristics of the combination. The use of the term "comprising" or "including" to describe a combination of elements, components, components or steps herein also contemplates an embodiment basically consisting of these elements, components, components or steps. The term "may" is used here to illustrate that any of the described attributes included in "may" are optional.

Multiple elements, components, components or steps can be provided by a single integrated element, component, component or step. Alternatively, a single integrated element, ingredient, component or step may be divided into separate multiple elements, ingredients, components or steps. The disclosure of "a" or "an" used to describe an element, ingredient, component or step does not mean to exclude other elements, ingredients, components or steps.

It should be understood that the above description is for illustration and not for limitation. By reading the above description, many implementations and many applications beyond the examples provided will be obvious to those skilled in the art. Therefore, the scope of the present teaching should not be determined with reference to the above description, but should be determined with reference to the foregoing claims and the full range of equivalents possessed by these claims. For comprehensive purposes, all articles and references including the disclosure of patent applications and announcements are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not to abandon the subject matter, nor should it be deemed that the applicant has not considered the subject matter as part of the subject matter of the disclosed application.

Claims

An AC asynchronous gearless variable speed traction machine, characterized in that the traction machine includes a three-phase asynchronous motor, a traction sheave fixed on the output shaft of the three-phase asynchronous motor, and the three-phase asynchronous motor An encoder and a brake for braking the traction wheel are also installed,

The three-phase asynchronous motor includes a stator housing, a stator arranged in the stator housing, and a rotor arranged on the outer ring of the output shaft. The two ends of the stator housing are respectively provided with a front end cover and a rear end cover, and the brake And the encoder is installed on the back end cover.
The AC asynchronous gearless variable speed traction machine according to claim 1, wherein the stator is composed of a stator core and enameled copper wire.
The AC asynchronous gearless variable speed traction machine according to claim 2, wherein the rotor is a cast aluminum rotor.
The AC asynchronous gearless variable speed traction machine according to claim 1, wherein the rear end cover is provided with a bearing for supporting the output shaft.
The AC asynchronous gearless variable speed traction machine according to claim 4, wherein the output shaft extends from the front end cover, and the traction wheel is located near the front end cover of the output shaft. position.
The AC asynchronous gearless variable speed traction machine according to claim 1, wherein the traction machine is connected to an elevator frequency converter.
The AC asynchronous gearless variable speed traction machine according to claim 1, wherein a plurality of wheel grooves arranged in the circumferential direction are provided on the wheel surface of the traction wheel, and the wheel grooves The cross section is V-shaped, and the toilet surface of the wheel groove is provided with a buffer layer made of hard rubber material.
An elevator system, characterized in that the elevator system includes the traction machine according to any one of claims 1 to 7, and the elevator system further includes a car.
An elevator system according to claim 8, wherein the car includes a car liner, an outer shell arranged outside the car liner, and the top wall of the car liner and the A plurality of upper spring dampers are installed between the top plate of the housing, and a plurality of lower spring dampers are installed between the bottom wall of the car liner and the bottom plate of the housing,

A plurality of electromagnetic dampers and piston rods are arranged between the side wall of the car and the side wall of the housing, and the upper end of the piston rod is installed in the electromagnetic damper and can run along the The electromagnetic damper moves up and down, the lower side of the bottom plate of the housing is also provided with an impact plate, the lower end of the piston rod passes through the bottom plate of the housing and then is fixedly connected to the impact plate,

The car also includes an inflatable system, the inflatable system includes an inflator installed between the bottom wall of the shell and the bottom wall of the car liner, the bottom plate and the impact plate provided on the shell The inflator can inflate the airbag, and the upper surface of the impact plate is also provided with a plurality of mounting blocks that can be embedded into the lower surface of the bottom plate of the shell,

The inflatable system has an inflated state and a folded state. When the inflatable system is in the folded state, the airbag is folded between the shell bottom plate and the impact plate, and the electromagnetic damper is opposed to the piston rod. Without force, the mounting block of the impact plate is embedded on the bottom of the housing; when the inflation system is in an inflated state, the airbag is in a bounced state under the inflation of the inflator, and the impact The plate is ejected downward relative to the bottom plate of the housing under the action of the airbag, and when the piston rod moves up and down relative to the electromagnetic damper, it receives the damping force of the electromagnetic damper.
An elevator system according to claim 9, characterized in that, a controller, an acceleration sensor for monitoring the acceleration of the car falling, and a speed controller for monitoring the speed of the car falling are also provided in the elevator car. Speed sensor, a distance measuring sensor used to monitor the distance between the bottom of the car and the bottom of the stairwell. When the acceleration of the car descending measured by the acceleration sensor is greater than the set acceleration, the descending speed of the car measured by the speed sensor is greater than the set speed. When the distance between the bottom of the car and the bottom of the stairwell measured by the distance measuring sensor is less than the set distance, the controller controls the inflator to inflate the airbag so that the inflation system is in an inflated state. After the inflation state, the controller controls the electromagnetic damper to form a damping force on the piston rod.