HIGH PRECISION CNC MOTION CONTROL

This thesis focuses on the design of an electrical drive system for the purpose of high precision motion control. A modern electrical drive is usually equipped with acurrent regulated voltage source along with powerful motion controller systemutilizing one or more micro-controllers and/or digital signal processors (DSPs).That is, the motor drive control is mostly performed by a dedicated digital-motioncontroller system.Such a motor drive mostly interfaces with its host processor via various serialcommunication protocols such as Profibus, CAN+, RS-485 etc. for the purpose of receiving commands and sending out important status/control signals. Consideringthat the motor drives lie at the heart of every (multi-axis) motion control system, theaim of this thesis is to explore the design and implementation of a conventional DCmotor drive system suitable for most industrial applications that require precisionand accuracy. To achieve this goal, various underlying control concepts andimportant implementation details are rigorously investigated in this study. A low power DC motor drive system with a power module, a current regulator anda motion controller is built and tested. Several design revisions on these subsystemsare made so as to improve the overall performance of the drive system itself.Consequently, important "know-how" required for building high performance (andhigh power) DC motor drives is gained in this research