A novel two-degree-of-freedom tubular linear-rotary switched reluctance machine (TLRSRM) is proposed, and its electromagnetic characteristics are investigated. First, based on energy conversion principles, the topology and working mechanism of the TLRSRM are explained. Structural dimensions are determined using conventional motor design experience. Next, a 3D finite element model (FEM) and a structural validation process are established to verify the electromagnetic feasibility of the topology. The magnetic field distributions are compared between the unaligned and aligned positions. Furthermore, parameter sweeping is applied to systematically analyze static electromagnetic characteristics. These include the nonlinear variation of inductance, flux saturation behavior, and electromagnetic force output in a twodimensional position-current parameter space. Finally, the multi-degree-of-freedom coupling mechanism is quantitatively analyzed. Simulation results of both static and dynamic performances successfully confirm the structural feasibility of the proposed topology, thereby establishing a solid theoretical framework for subsequent optimization and control.
Mover-permanent magnet linear-rotary generators (MPMLRGs) with dual-stator topology and two degrees of freedom (2-DOF) have attracted growing interest due to their high integration and compactness, enabling coupled linear-rotary motion for direct-drive energy conversion and multifunctional actuation systems. However, the coupled linear-rotary motion and unsymmetric dual-stator topology lead to complex thermal behaviors, and the associated thermal characteristics remain insufficiently investigated compared to electromagnetic studies. In this paper, a lumped-parameter thermal network (LPTN) model is developed for a dual-stator MPMLRG to accurately capture its asymmetric heat transfer and temperature rise under helical motion. A novel approach is proposed to determine the air-gap convective heat transfer coefficients under coupled linear-rotary operation, along with a time-weighted correction method to account for the partial axial overlap of stator-mover surfaces. The thermal model is validated against 3-D thermal finite element analysis (FEA), showing good agreement while significantly reducing computational effort. The results provide useful insights into the thermal management of the dual-stator MPMLRG and establish a foundation for future design optimization and cooling enhancement.
This paper proposes a novel tubular linear rotary switch reluctance machine (TLRSRM) with modular stator and rotor designs and studies its electromagnetic characteristics. Firstly, the topology and operating mechanism of the two-degree-of-freedom machine are presented. based on the proposed motor design process, the structural dimensions are initially determined, and the 3D finite element model (FEM) with its flux density distribution is provided. Secondly, a sensitivity analysis of critical structural parameters is conducted by using a parameter sweep method to investigate their influence on torque performance. Finally, to evaluate the motor’s static characteristics – including flux linkage, inductance, and torque/thrust – comparison analysis is performed between two TLRSRM variants featuring different winding configurations. Simulation results validate the feasibility of the proposed topology.
This paper proposes a novel modular stator 6-pole tubular linear rotary switch reluctance machine (TLRSRM). The proposed structure employs circumferentially distributed H-shaped stator modules, with each module’s four poles wound with concentrated windings. The outer stator pole windings and outer rotor form a three-phase radial magnetic circuit driving rotational motion, while the inner stator pole windings and inner rotor constitute a single-phase transverse magnetic circuit driving linear motion. This paper elucidates the motor’s operating principle and electromagnetic design process. Based on the three-dimensional magnetic field distribution characteristics, finite element analysis (FEA) was employed for three-dimensional magnetic field calculations to obtain flux linkage and torque characteristics. Additionally, the electromagnetic coupling effects between rotational and linear motions were investigated for the conjugate rotary-linear magnetic circuit within the modular stator. Simulation results indicate minimal electromagnetic coupling effects in the proposed TLRSRM structure. This study provides a robust theoretical foundation and empirical data support for further optimization and practical application of this motor topology.
As environmental protection increasingly becomes a global focus, new energy vehicles have gradually emerged as a rising star in the modern transportation sector. They not only represent technological innovation but also carry the hope of achieving sustainable mobility. This paper proposes a novel dual-port integrated power converter, consisting of a front-end circuit and a traditional asymmetric half-bridge converter. By changing the operating state of the front-end circuit’s switch transistors, different operating modes can be switched. In the motoring state, there are single-power supply mode and hybrid power supply mode, and the converter is reconfigured into a five-level converter. In the regenerative braking mode, there are moderate braking mode and severe braking mode, and energy recovery can be achieved in both modes, with the converter being reconfigured into a four-level converter. The power converter proposed in this paper can accommodate wide speed range regulation for both electric and braking operations, while also recovering energy from regenerative braking. It has been simulated and verified on a three-phase 12/8 switched reluctance motor, confirming its practicality and effectiveness.
