Permanent Magnet Crane

Abstract

The invention relates to a permanent magnetic crane which comprises a bridge, a crane traveling mechanism fixedly connected with the bridge, a trolley arranged on the bridge, a hoisting mechanism arranged on the trolley, a trolley traveling mechanism and an electric control system. The crane is characterized in that multiple outer rotor permanent magnetic synchronous motors are distributed on a roller shaft in a winch roller at intervals, rotors of the outer rotor permanent magnetic synchronous motors are connected with the winch roller, stators of the outer rotor permanent magnetic synchronous motors are arranged on the roller shaft in a sleeved mode, the crane traveling mechanism and the trolley traveling mechanism are driven by inner rotor permanent magnetic synchronous motors, permanent magnetic eddy-current couplings are connected between the inner rotor permanent magnetic synchronous motors and wheel shafts, and the rear ends of the inner rotor permanent magnetic synchronous motors are provided with magnetic disk brakes. The crane is simple in structure and simple and reliable in transmission, has the advantages of saving energy, being environmentally friendly, low in self weight, intelligent, low in noise and the like, and remarkably improves safety of the hoisting mechanism, and it is guaranteed that use of the crane is not influenced when the hoisting mechanism is maintained.

Description

technical field [0001] The invention relates to lifting equipment, in particular to a permanent magnet crane using a permanent magnet synchronous motor, a permanent magnet eddy current coupler and a permanent magnet brake. Background technique [0002] At present, the bridge crane occupies an irreplaceable position in the lifting equipment due to its wide application range. The hoisting mechanism, trolley running mechanism and electrical system on the trolley have the following problems: [0003] 1. The driving motors of the hoisting mechanism and the operating mechanism are all asynchronous motors, and their power factors are low. During operation, lagging reactive power must be absorbed from the grid, which is very unfavorable to the operation of the grid, and the speed regulation performance of the asynchronous motor is poor. It is not conducive to the control of the lifting mechanism and the operating mechanism; [0004] 2. There are reducers and other connection acces...

AI Technical Summary

Problems solved by technology

[0003] 1. The driving motors of the hoisting mechanism and the operating mechanism are all asynchronous motors, and their power factors are low. During operation, lagging reactive power must be absorbed from the grid, which is very unfavorable to the operation of the grid, and the speed regulation performance of the asynchronous motor is poor. It is not conducive to the control of the lifting mechanism and the operating mechanism;

[0004] 2. There are reducers and other connection accessories between the drive motor and the drum shaft of the lifting mechanism, and between the wheel shaft of the running mechanism, which not only has the problems of complex transmission and low mechanical efficiency, but also increases the lifting capacity. The failure point of the mechanism and the trolley operating mechanism, the repair and maintenance costs are high;

[0005] 3. When the wheel group of the operating mechanism adopts a decentralized drive mode, the phenomenon of deflection and gnawing of the wheel group due to the different speeds of the drive motors often causes the wheel group to run out of sync, which intensifies the vibration of the crane, reduces the service life of the whole machine and wastes electric energy

[0006] In recent years, European-style cranes represented by Konecranes, SWF, and Demag have entered the Chinese market. They have the characteristics of beautiful appearance, light weight, and low noise. The problem of deflection and gnawing of the trolley running mechanism, and because of its high maintenance cost and long maintenance time, the market share in my country is not high and it is difficult to promote

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