Elevator tractor

Abstract

The invention relates to an elevator tractor which comprises a synchronous motor, a speed reducing box, a traction wheel and an electromagnetic brake, wherein the electromagnetic brake comprises a brake wheel and a brake shoe which are matched with each other for braking; the synchronous motor comprises a main motor body and an outer rotor; and the brake wheel is integrated on the outer rotor and is positioned between the main motor body of the synchronous motor and the speed reducing box. Compared with an asynchronous geared tractor, the elevator tractor can work at lower rotating speed and is lower in noise; a helical gear is adopted by the elevator tractor in a matching way and is taken as a speed reducing mechanism of a transmission part, so that the whole transmission efficiency of the elevator tractor can be improved; the speed reducing box is arranged, so that the requirement on the output torque of the synchronous motor can be reduced, the cost increase of an elevator caused by the facts that larger moment is output by the synchronous motor and a great deal of magnetic steel is needed to be used is avoided; an input end of the speed reducing box is braked, so that the braking moment is small, and the requirement on the brake is low; and meanwhile, by adopting a structure integrating a brake disc, a coupler and the outer rotor of the motor, the elevator tractor is compact in structure and meets the using requirement of a small machine room elevator.

Description

technical field [0001] The invention relates to an elevator traction machine used in a vertical elevator driving system, belonging to the technical field of lifting facilities. Background technique [0002] The existing elevator traction machine mainly has the following two structural types: [0003] One is the permanent magnet synchronous gearless traction machine, which is also the most widely used elevator traction machine at present. Its characteristic is that the permanent magnet synchronous motor directly drives the traction sheave to rotate without a deceleration mechanism. The traction machine is mainly composed of a permanent magnet synchronous motor, a traction wheel and a braking device. This traction machine is braked at the end of the traction wheel. Due to the self-locking nature of the worm, a large braking torque must be directly applied to the shaft end of the traction wheel; It has the characteristics of simple structure, reliable operation, small size, l...

AI Technical Summary

Problems solved by technology

The traction machine is mainly composed of a permanent magnet synchronous motor, a traction wheel and a braking device. This traction machine is braked at the end of the traction wheel. Due to the self-locking nature of the worm, a large braking torque must be directly applied to the shaft end of the traction wheel; It has the characteristics of simple structure, reliable operation, small size, light weight, high efficiency, low speed and large torque, but the main component of permanent magnets is rare earth materials. In recent years, with the increasing price of rare earth resources, the cost of magnetic steel has increased rapidly Correspondingly, the cost of the traction machine continues to rise, and the economic benefits become lower, especially for the traction machine with high rated torque that requires more magnets, the cost is further increased. The performance requirements are also relatively high, which also increases the cost of the traction machine to a certain extent

[0004] The second type is asynchronous geared traction machine, its structure mainly includes AC asynchronous motor, worm gear or helical gear reduction mechanism, brake and traction wheel, the power of AC asynchronous motor is transmitted to the traction wheel through the reduction mechanism, brake and asynchronous The motor is separated and coaxially fixedly connected, and the brake is on the motor side. Its characteristics are that the required braking torque is small and the performance requirements of the brake are low. This kind of traction machine has a simple structure and mature technology. It is currently mostly used in low-speed elevators. And freight elevators, but because the traction machine adopts asynchronous motor and deceleration mechanism at the same time, and adopts split design in structure, it has low motor efficiency, large volume, low transmission efficiency, high energy consumption, high noise, and poor ride comfort And other issues

Some of the asynchronous geared traction machines also use a helical gear reduction mechanism, which improves the overall transmission efficiency of the traction machine to a certain extent. However, due to the use of asynchronous motors, the working speed of the helical gears is high, resulting in serious wear and low life. , greater noise, etc., especially the large volume of the machine room increases the volume of the elevator machine room used to place the traction machine, wasting a lot of construction space and building materials, and cannot meet the current needs of people for small machine room elevator products

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