Low pass filter is effective for noise reduction in control systems. This paper treats an I-PD control system with low pass filter. First, we show a closed-loop transfer function from reference value to the output of the system. The I-PD controller is designed based on the pole placement method. Second, we introduce a several conditions of the controller to be satisfied. Finally, we present that the proposed methods have obtained a good result by a simulation example and an experimental result of speed control for a DC motor.
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