Lifting system and control method of permanent magnet direct drive electromagnetic hanging beam crane

Abstract

The invention discloses a hoisting system of a permanent magnetic direct drive type electromagnetic suspended beam crane. The hoisting system comprises a controller, two frequency converters, two direct drive type permanent magnetic synchronous motors and steel wire ropes of the synchronous motors, two brakes, an electromagnetic suspended beam, a plurality of electromagnetic chucks and two encoders, wherein the encoders are connected with the direct drive type permanent magnetic synchronous motors to obtain the rotating speed and position information of the direct drive type permanent magneticsynchronous motors and upload the rotating speed and position information to the controller; and the controller controls the direct drive type permanent magnetic synchronous motors to have synchronous operation so as to ensure the height difference of two ends of the electromagnetic suspended beam. The invention further discloses a controlling method of the hoisting system of the permanent magnetic direct drive type electromagnetic suspended beam crane. The controlling method comprises the following steps: starting and levelling; adjusting the rotating speed of the motors through the frequency converters to ensure the height difference of two ends of the electromagnetic suspended beam; recording the torque current value under the zero-speed hovering state during halt and braking; after halt and during operation, establishing the torque current with high priority; starting with the controlling parameter changed; and carrying out normal operation. The hoisting system is low in cost andsimple and reliable to control, can effectively prevent hook gliding and realizes coordination synchronization.

Description

technical field [0001] The invention specifically relates to a lifting system of a permanent magnet direct-drive electromagnetic hanging beam crane and a control method thereof. Background technique [0002] With the development of the country's economy and technology and the improvement of people's living standards, the construction industry has ushered in investment peaks again and again. The rapid development of the construction industry directly drives the development of the lifting system. [0003] Electromagnetic hanging beam crane is a lifting system that develops extremely rapidly in the field of lifting. At present, the lifting mechanism of the traditional electromagnetic hanging beam crane usually drives two reducers by one motor, and then drives two double-connected reel groups to complete the lifting and lowering functions of the hook group, but its mechanism is complex and bulky , high weight, serious noise, low transmission efficiency, unstable operation and ...

AI Technical Summary

Problems solved by technology

[0006] 2) Due to the difference in the pull-in position of the electromagnetic chuck and the load, the loads on both sides will be inconsistent, so when the load is lost during operation, it is a sudden load change for the motor, and the impact of the two motors is different, which will lead to instantaneous speed on both sides. Inconsistencies, which eventually lead to synchronization problems, need to coordinate synchronization and eliminate deviations

[0007] However, the current traditional electromagnetic hanging beam crane hoisting mechanism composed of an outer rotor direct-drive permanent magnet synchronous motor, when solving the above problems, some use a laser ranging sensor to achieve synchronization, but the cost of this solution is extremely high; Some realize anti-slip hook or overshoot by predicting the existing load under the condition of the brake, but the algorithm is very complicated to implement; others prevent the overshoot by increasing the torque until there is a tendency of relative movement when the brake is applied. Sliding hook and overshoot, but this solution will cause serious wear of the brake when the brake is opened, and affect the life of the brake

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