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U radu je analiziran rad tiristorskog usmjerivača Simoreg DC Master koji se sastoji od dva tiristorska mosta u antiparalelnom spoju. Kao regulirani pogonski stroj stavljen je istosmjerni motor s nezavisnom uzbudom. Analizirana su pogonska stanja motora te je prikazan 4-kvadratni rad pretvarača. Fokus je stavljen na analizu i prikaz načina prijelaza u radu pretvarača s jednog na drugi tiristorski most. This paper analyzes the operation of the thyristror converter Simoreg DC Master consisting of two thyristor bridges in an inverse-parallel. As a regulated drive it is installed a separately excited DC motor. It is analyzed and displayed four quadrant drive. The focus is placed on the analysis and presentation of the transmutation mode of operation from one to the other of the thyristor bridge.

Automation has been growing in recent years for the manufacturing industries to increase productivity. Multiple robotic arms are used to handle materials for lifting in flexible directions. The vertical rotation of a 360 degree single arm is considered in this research on a position servo drive with brushless DC motor. The load torque of an arm varies depending upon the angular displacement due to gravity, so it requires four-quadrant operation of the drive with a robust feedback controller. This paper deals with the design and performance comparison of a conventional PID feedback controller with a fuzzy-based PID controller and suggests the most suitable controller. The design was implemented in real time through the dSPACE DS1104 controller environment to verify the dynamic behaviors of the arm.