Abstract
To make the output response of the control system of precision linear motor displacement system (PLMDS) accu- rately track the input instructions and to eliminate the adverse influences introduced by the load disturbance and the cut- ting-force fluctuation from direct drive, a zero phase error tracking control (ZPETC) scheme based on least-beat and non-ripple control in PLMDS is proposed for the application to the CNC turning of non-circular cross-section part, which can eliminate the system phase error caused by the unstable zeros and enhance the system response rate as well. Simulation re- sults show that this method can effectively improve the system tracking performance. The steady-state sinusoidal signal track- ing error of the system can reach up to ±0.5 μm with rapid and accurate step response. Compared with general control strate- gies of PLMDS, this method increases the system tracking ac- curacy and possesses fine anti-disturbance ability, which is endowed with the potential for wide application.
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