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This article proposes a detailed mathematical dqn axes dynamic modeling of a double saliency flux modulated permanent magnet linear synchronous motor used as the linear actuator for the five-axis gantry robot system to study thrust ripple characteristics. To derive the model, the machine double saliency is considered by analyzing the effect of the cross-coupling inductances into the dynamic voltage equation in dqn axes. The electromagnetic performances such as the electromagnetic thrust and the thrust ripple is formulated to check the maximum limit of the thrust ripple at the initial design stage using the derived model. The whole process is validated using 2-D, 3-D finite element analysis, and manufactured prototype under driving conditions.

This article proposes a design process for a flux modulated (FM) permanent-magnet linear actuator for a five-axis gantry robot system by investigating the parameters affecting working harmonics. A detailed design process using the magnetic gearing effect was developed by considering the magnetic equivalent circuit and finite element analysis models of the FM-linear actuator. Considering natural cooling, the design process includes the effect of irreversible demagnetization when selecting the design parameters. Using the design parameters, a final simulation model was created to check the electromagnetic performance under both no-load and full-load conditions. A prototype was built to validate the results obtained using the proposed analytical model.

This paper presents a critical review of traction motors used for distributed traction (DT) applications in high-speed railways (HSR). The motor topologies that can be used for DT-HSR are presented. The advantages and disadvantages of each motor in terms of structural and electromagnetic performance are discussed from the perspective of motor design. A survey of the advancement of the HSR industry in South Korea is presented, and the required torque–speed profile for the HSR traction motors for the South Korean railway is studied. Along with the electromagnetic design, detailed structural modeling constraints such as the framing design, slot insulation, end-winding potting, and slot wedge modeling are explained.

An initial mover position (IMP) detection algorithm for a dual-saliency flux-modulated permanent magnet linear synchronous motor (DS FM-PMLSM) for a five-axis gantry robot has been proposed in this proposed work. The proposed IMP algorithm uses the saliency of the proposed machine, which results in the inductance variation and checks the change in the inductance by providing sequential current profiles. The effect of the end region at the entry and exit are included to check the robustness of the proposed IMP. A design platform using MATLAB and Altair-Flux has been developed to simulate the proposed IMP algorithm for different positions of the mover. Based on the simulation model, a test setup is developed using a low-cost sensor and six-step inverter and tested the validity of the proposed IMP algorithm for the DS FM-PMLSM.