Multi-Motor Drives for Crane Application

Abstract

This paper focuses on the application of adjustable speed induction motor drives for gantry cranes. Modern solution considers application of frequency converters for all drives. Multi-motor drives are standard solutions in crane application and requirements of load sharing are present. Presented algorithm provides load sharing proportional to the rated motor power on the simple and practically applicable method on the basis of estimated torques by frequency converters, and controller realized in PLC. Special attention is devoted to wide span gantry drive and algorithm for skew elimination. Solutions for load distribution in multi-motor drive, as well as mode of gantry drive skew elimination, are described. Suggested solution concept is confirmed by the experimental results

Distribution of the Strip Tensions with Slip Control in Strip Processing Lines

“…Following the tension change, the power limit of drives P5 and P4 was exceeded. For these drives, a new value of factor e µαi_MAX_F was calculated using Equation (25). The tension distribution algorithm calculated new tension references and, as a consequence, the tensions among the rolls reached these values, not exceeding the maximum.…”

“…Each motor must contribute to the proportional sharing of power to the driven load. Currently, these load-sharing drives usually use one of the following algorithms: droop, speed trim follower, or torque follower, also known as master-slave [24][25][26][27]. For the last case, the ratio of load sharing can be adjusted so that each motor shares a proportional amount of load under all conditions.…”

Speed Control in Electromagnetic Synchronization System with Two Single Phase Induction Motors by Rotor Flux Regulation

“…In this case, the magnetic field of the motor with higher load will penetrate the RL element side, connected to the lightly loaded motor, and will induce in it counter electro force. This will slow down the lightly loaded motor until the speeds of both motors wi In [11]- [13], speed synchronization of multi paying attention to the application of adjustable speed induction motor drives for gantry cranes. Solutions for load distribution in multi elimination, are described.…”

“…Consequently, the produced electromagnetic fields in the three-phase RL-element will be opposite in direction and different in the magnetic field of the motor with higher load will penetrate the RL element side, connected to the lightly loaded motor, and will induce in it counter electro force. This will slow down the lightly loaded motor until the speeds of both motors wi [13], speed synchronization of multi-motor systems had been studied. In [13] author is paying attention to the application of adjustable speed induction motor drives for gantry cranes.…”

The Monospiral Motorised Cable Reel in Crane Applications

“…Electrical technology for the crane control has undergone a significant change during the last few decades. Old solutions with Ward-Leonard drive systems and induction motors with wound rotor are replaced with more contemporary technology that uses frequency converters and standard squirrel-cage induction motors for all types of motion [1,2,3]. General classification divides induction motor control schemes into scalar and vector-based methods.…”