Design and Control of a Transverse Flux Linear Switched Reluctance Machine for Rail Transit Application

Abstract

The design, optimization and control methods of a transverse flux Linear Switched Reluctance Motor (LSRM) for the rail transit application are introduced. Two structures of LSRMs, EI type and EE type, are compared and analyzed. The structure of EE type machine is optimized from the perspective of average electromagnetic thrust per unit mass through finite element calculations. The initial sizes of the motor are calculated according to the design theory of the rotary SRM. After obtaining the initial sizes, the sensitivities of the LSRM sizes are analyzed by the three-dimensional finite element calculation, and then the sizes such as the slot depth, the slot width and the tooth width of the motor are optimized. The hardware test platform is built, the electromagnetic characteristics of the prototype are tested, and the motor characteristics of the LSRM with different secondary materials are compared. The control method of the LSRM with position sensors is proposed, and then the sensorless control of the motor is also realized based on the pulse injection strategy. The experimental results verify the effectiveness of the design and control strategies.

A new flux and multilevel hysteresis torque band DTC with lookup table‐based switched reluctance motor drive to suppress torque ripple

“…A proposed block diagram represented in Figure 2 is a four-phase SRM and DTC strategy that includes amplitude flux linkage and torque control signals to select the optimal switching state. The 8/6 SRM represents four flux linkages estimated from stator phase currents using (7) and (8), respectively.…”

“…5 The direct and indirect control techniques effectively reduce torque ripple for the non-linear inductance profile of the SRM drive. 6,7 The Indirect torque control of torque sharing function (TSF) is effectively adopted to SRM current profiling to avoid the negative current region, which causes high torque ripple. 8 Therefore, the existing direct torque control technique is the most valuable control objective to help reduce the torque ripple compared with the indirect control scheme.…”

“…Many research scholars attempted different design and control techniques to minimize the torque ripple for SRM drives 5 . The direct and indirect control techniques effectively reduce torque ripple for the non‐linear inductance profile of the SRM drive 6,7 . The Indirect torque control of torque sharing function (TSF) is effectively adopted to SRM current profiling to avoid the negative current region, which causes high torque ripple 8 .…”

Analysis of linear permanent magnet switched reluctance motors with modular and segmental movers

“…The operation principles of the LSRMs are similar to the rotating types, and they consist of a stationary and a moving part, which are called the stator and mover, respectively. LSRMs have many applications like elevators [32], launchers [33], vertical propulsion in industrial factories [34], and rail transit [35]. A comparative study of LSRMs and linear flux switching motors both assisted with PMs for railway transportation in Ref.…”

Multi-objective optimization design of novel tubular switched reluctance motor

“…Tubular switched reluctance motor (TSRM) has attracted wide attention because of its simple structure, good airtightness and direct conversion of electrical energy into mechanical energy (Masoudi et al , 2020). TSRM also has an increasingly wide range of applications in direct-drive wave power systems, logistics transportation systems, elevator traction systems and rail transit systems (Du et al , 2017; Ching and Li, 2018; Li et al , 2020a; Li et al , 2022).…”