ANALYTICAL CALCULATION OF THE POSITION LOOP GAIN FOR LINEAR MOTOR SERVO DRIVES FOR CNC MACHINE TOOLS
Journal
Academic Journal in Manufacturing Engineering
Date Issued
2023-06
Author(s)
Zoran PANDILOV
Abstract
One of the most important factors which influence on the dynamical behavior
of the linear motor servo drives for CNC machine tools is position loop gain or Kv factor. From
the magnitude of the Kv-factor depends tracking or following error. In multi-axis contouring the
following errors along the different axes may cause form deviations of the machined contours.
Generally position loop gain Kv should be high for faster system response and higher accuracy,
but the maximum gains allowable are limited due to undesirable oscillatory responses at high
gains and low damping factor. Usually Kv factor is experimentally tuned on the already
assembled machine tool. This paper presents a simple method for analytically calculation of the
position loop gain Kv. The influence of nonlinearities was taken with the correction factor. Our
investigations have proven that experimentally tuned Kv factor differs from analytically
calculated Kv factor less than 10%, which is completely acceptable.
of the linear motor servo drives for CNC machine tools is position loop gain or Kv factor. From
the magnitude of the Kv-factor depends tracking or following error. In multi-axis contouring the
following errors along the different axes may cause form deviations of the machined contours.
Generally position loop gain Kv should be high for faster system response and higher accuracy,
but the maximum gains allowable are limited due to undesirable oscillatory responses at high
gains and low damping factor. Usually Kv factor is experimentally tuned on the already
assembled machine tool. This paper presents a simple method for analytically calculation of the
position loop gain Kv. The influence of nonlinearities was taken with the correction factor. Our
investigations have proven that experimentally tuned Kv factor differs from analytically
calculated Kv factor less than 10%, which is completely acceptable.
Subjects
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