Development of high performance servo drive/anti drive mechanism for backlash removal
Keywords: 1 Degree of freedom Platform, Backlash Removal, System Modelling. Abstract: In electromechanical drives, there is always a backlash between any pair of gears. Because of this, it is almost impossible to realize a high accuracy and high performance drive. However such drives are crucial in today’s modern electromechanical systems. A high performance drive/anti-drive servo mechanism is developed to eliminate the effect of backlash. The concept utilizes redundant unidirectional drives to assure positive coupling of gear meshes at all times. Based on this concept, a methodology for enumeration of admissible redundant-drive backlash free mechanism has been established. The angular displacement is achieved as a difference of two torques. These torques can be controlled by a high performance control system. A controller model will be designed to move a single degree of freedom platform up to a desired span with a payload.
Impact of toothed gear nonlinearities on servomechanism performance
Due to insufficient stiffness of gear transmission and presence of backlashes, oscillations and reduced positioning accuracy may occur in automatic control systems. This paper gives an analysis of the impact mechanism of gear backlashes, as well as the ways of reducing or eliminating their influence on the system performance. Introduction of divided gears can eliminate backlash introduced effects but can also decrease the resonance maximum frequency and move it near the cut-off frequency or even in the pass-band of the system making it unstable. Examples and calculations are presented which show how to eliminate these problems.
Ground Fault Protection for Electric Utility Generating Station Medium Voltage Auxiliary Power Systems
Most generating station designs have medium voltage auxiliary power systems with low resistance grounded neutrals.1 In order to provide even higher reliability, the auxiliary power distribution system configurations supply increasingly redundant process equipment.