The design of PID controller for track following control of hard disk drive using coefficient diagram method

This paper presents the design of PID controller for track following control of hard disk drive using Coefficient Diagram Method (CDM). For this reason, Track following control of hard disk drive process has many disturbances from internal and external sources, so determining satisfactory controller parameters to stabilize control system and satisfy response specification is difficult. The proposed PID controller design using Coefficient Diagram Method (CDM) based on proper choosing the coefficients of the characteristic transfer function of the closed loop control system in accordance with stability index and equivalent time constant is an uncomplicated and convenience technique for applying to Track following control in hard disk drive process. Matlab simulation results shown that PID controller using CDM technique is fairly stable and robust whilst give the convenience in controller´s parameters adjustment.