This paper proposes a novel two-degree-of-freedom rotary-linear permanent magnet machine (2DoF-RLPMM) with an axially-separated winding configuration. This configuration is intended to overcome the limitations of traditional screw-locking applications, which require the integration of multiple motors to achieve 2DoF motion and result in large volume. The 2DoF-RLPMM features a two-segment stator and a unique three-segment mover, enabling rotary, linear, and helical motion to execute specific phases of screw-locking operation. To address the challenges of optimizing the complex, asymmetric 3D structure using 3D finite element analysis (FEA), a segmented cascaded co-optimization method is developed. This approach utilizes iterative 2D FEA to sequentially optimize rotary performance, transfer correlation parameters, optimize linear performance, and finalize the transition segment. This enhances torque and thrust performance while reducing computational complexity. Subsequently, a comparative performance analysis of four models based on the optimization results is conducted. The results demonstrate that Model I exhibits superior overall performance. Specifically, Model I delivers an average torque of 2.64 Nm with a ripple of only 9.2% in Rotary Motion State I, and generates an average thrust of 100.5 N in Linear Motion State I. Finally, a statistical analysis is introduced to quantitatively assess torque and thrust coupling effects, revealing negligible torque coupling and acceptable thrust coupling levels. This rigorously validates the effectiveness of the proposed topology in achieving motion decoupling.
Wang et al. (Fri,) studied this question.
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