Analysis and Optimization of a Novel Tubular Staggered-Tooth Transverse-Flux PM Linear Machine

Abstract

A novel tubular staggered-tooth transverse-flux permanent magnet linear synchronous machine (STTF-PMLSM) is proposed. The machine is characterized by simple structure and low flux leakage. Firstly, the structure and operational principle are introduced. Secondly, the 3-D equivalent magnetic circuit model of the machine is built, and the analytical expression of the electromagnetic force is derived. Finally，the force density and force ripple are optimized with respect to three key dimensional ratios using 3-D finite element method (FEM). An optimized scheme with high force density of 2.697×10 5 N/m 3 and low force ripple of 2.78% is achieved. And the characteristics of the proposed machine are compared with other topologies of linear machine.Index Terms-Equivalent magnetic circuit model, 3-D finite element method (FEM), transverse-flux, linear machine, thrust force. 0018-9464 (c)

Performance Analysis and Modeling of a Tubular Staggered-Tooth Transverse-Flux PM Linear Machine

“…Moreover, the teeth of adjacent stator cores are staggered and have no overlap, which will greatly decrease the inter-pole flux leakage. Because the inter-pole flux leakage is the primary part of the total flux leakage, leakage reactance will reduce [19].…”

“…The main design specifications of the STTF-PMLSM are shown in Table 1 [19]. The flux distribution in the stator of the STTF-PMLSM under no-load conditions is shown in Figure 3.…”

“…Due to the decoupling of the magnetic circuit of three phases, only one phase model is built in order to save the computation time. The main design specifications of the STTF-PMLSM are shown in Table 1 [19]. The flux distribution in the stator of the STTF-PMLSM under no-load conditions is shown in Figure 3.…”

“…In order to solve the aforementioned problems, a novel tubular staggered-tooth transverse-flux permanent magnet linear synchronous machine (STTF-PMLSM) was proposed, which is characterized by simple structure and low flux leakage [19,20]. The stator core of the STTF-PMLSM is unsegmented and can be fabricated by silicon-iron steel lamination, which can largely simplify the manufacturing process and increase the mechanical strength.…”

“…The stator core of the STTF-PMLSM is unsegmented and can be fabricated by silicon-iron steel lamination, which can largely simplify the manufacturing process and increase the mechanical strength. The 3-D magnetic equivalent circuit modeling and optimization of the machine was investigated, and an optimized scheme with higher force density and lower force ripple was achieved in [19].…”