This paper presents a controller design approach of load devices considering improvement of disturbance suppression characteristic at specific frequency. The disturbance with specific frequency generated by an abrasive motor in the system deteriorates tracking performance for the target load, resulting in the lower control accuracy. In order to compensate for the disturbance, therefore, a simple feedback compensator is designed to improve the disturbance suppression capability at specific frequency, where resonant filter is designed by paying attention to vector locus of open-loop characteristic. The effectiveness of proposed approach is verified by experiment using actual load devices.
