| Abstract |
Electrical drives are largely used in machine-tools. The connection between the electrical machine and the mechanical load is effected by different transmission devices, i.e. worm screws, gear-boxes, belts. The performance of the drive is significantly influenced by variation of the loop gain, friction and elasticity. The control strategy is generally designed by considering an ideal load in which friction and elasticity are negligible. This condition is attained by an appropriate maintenance. During the operation of the machine-tool loop gain, friction and elasticity vary. Therefore the performance of the drive is degradated. An alternative approach to a preventive maintenance consists in measuring the machine tool performance by suitable tests for detecting specific maintenance necessity. These tests can be effected periodically during the non-operation time intervals of the machine-tool. The paper presents a first approach to this problem and suggests a procedure for detecting the relevance of the decreasing of the loop-gain, the increasing of the friction, the modification of the elasticity. |
