DYNAMIC PROPERTIES OF THE DIGITAL AUTOMATIC CONTROL SYSTEM OF THE ELECTROMAGNETIC VIBRATION DRIVE

A control system of a vibration drive supports a given level of vibration amplitude in the near-resonance mode in condition of changing mass and mechanical properties of the material that is being processed. Changes in the mechanical parameters of the oscillating system can lead to loss of stability of the control system, so this should be considered in its design. Therefore, research of the stability of vibration drives automatic control systems is an actual task. The article considers the influence of quantization effect on the electromagnetic vibration drive digital control system stability. A dynamic model of a control system that considers the quantization of the signal amplitude is developed, and the simulation of control processes of the smalldamping oscillatory system with an electromagnetic drive by varying the mechanical parameters, the frequency of vibration and the ratio of the integral regulator is held. It is shown that due to quantization the step changes of the amplitude of the control voltage when using a near-resonance mode can cause the instability of the oscillations amplitude control system. To provide the stability it is suggested to include the dead zone link in the structure of the amplitude regulator. The ranges of the control system stability that can be used when selecting the regulator parameters at the design stage are determined. Experimental studies, which confirm the theoretical results are held.