“…In the first approach, more comprehensive controllers than a simple P-controller are utilized (e.g., fuzzy logic, etc. ), and consequently, a reduction in the position errors of each individual axis is achieved [2,7,9,10,22,[27][28][29]35]. The second approach is based on adding a feedforward controller (e.g., ZPETC) to compensate for the axial position errors [8,23,[30][31][32]34].…”