Design and manufacturing of control circuits for centrifuge device motors

A centrifuge is a tool that functions to separate organelles based on their density. The working principle of a centrifuge uses the principle of rotation or rotation of the tube containing the solution so that it can be separated based on its density. To mix the blood and reagents in the test tube which is placed in the disk hole, rotation is carried out on the disk hole of the test tube using a DC motor. The rotation of the DC motor greatly influences the process of mixing blood and reagents to achieve even mixing results in the blood ready for testing. Regulating motor speed is very important in centrifuge devices. This research designs and makes a control device to regulate the desired speed of a DC motor to move the disk hole of a test tube containing blood to produce evenly mixed blood and reagents. This DC motor control circuit uses a microcontroller circuit that produces control signals to regulate speed to produce optimal DC motor speed. From the results of DC motor load testing with a disk hole filled with 12 test tubes using the PID algorithm by changing the Kp, Ki and Kd parameters for DC motor speed at speeds of 1000 rpm, 2000 rpm, 3000 rpm and 4000 rpm. The best PID parameter setting values with Kp=2 Ki=0.1 and Kd=2 produce steady state times of 15 seconds, 18 seconds, 15 seconds and 18 seconds. Steady State Error 6%, 6%, 4% and 4.5%. The effect of adding the Kd parameter is not significant on changes in steady state time and Steady State Error.