PURPOSE:To stabilize discrete system control and improve the control accuracy without increasing the cost and complexity by setting the sampling frequency of the discrete control system to a specific frequency. CONSTITUTION:The sampling frequency fs of the discrete control system 11 is set to fs=fnX21-m (m=0, 1, 2,-) against the resonance frequency fn of the 2nd-order vibration term of a system 21 to be controlled. As a result, the peak of the gain of the 2nd-order vibration term can be compensated and a stable system can be obtained. In addition, the stable system can be obtained without increasing the cost because it is not necessary to make the constitution more complex and to use any high-speed arithmetic element.
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