Abstract
The tubular linear permanent magnet synchronous motor (TLPMSM) can directly provide large thrust without the need for transmission mechanisms like screws. However, the coupling length between the stator and mover in TLPMSM may change during operation, leading to parameter changes and thrust fluctuations. In this paper, we propose an improved deadbeat prediction current control method for linear motors with variable coupling length (VC-DPCC). To solve the model mismatch and parameter mismatch problems, we first analyze the variation of inductance and flux linkage and calibrate the fundamental component of the parameters based on the analytical model. Then, our proposed method suppresses the impact of harmonic components of parameters and eliminates the current prediction error caused by magnetic field distortion. Finally, our proposed method is verified on an experimental prototype. Compared to traditional control methods, the proposed method offers faster response and reduced current fluctuations, significantly improving the performance of TLPMSM in terms of current and thrust control.
