Design and analysis of tubular permanent magnetic linear generator with 120° phase belt toroidal windings

Abstract

Purpose To improve the power density and generation efficiency of the tubular permanent magnetic linear generators (TPMLGs) under realistic sea-stator condition, a TPMLG with 120° phase belt toroidal windings (120°-TPMLG) for wave energy conversion is proposed in this paper. Design/methodology/approach First, the structure of the 120°-TPMLG is introduced and its operation principle is analyzed. Second, the design process of the 120°-TPMLG is described. Meanwhile, the finite-element models of the 120°-TPMLG and the TPMLG with traditional fractional pitch windings (T-TPMLG) are established based on the similar overall dimensions. Then, the electromagnetic characteristics of the 120°-TPMLG are analyzed, such as air gap flux density, back electromotive force and load voltage. Finally, a comparative analysis of the magnetic flux density, flux linkage, load and no-load performance of the two generators are conducted. Findings The result shows that the 120°-TPMLG has higher power density and generation efficiency than the T-TPMLG. Originality/value This paper proposes a TPMLG with 120° phase belt toroidal windings (120°-TPMLG) to improve the power density and generation efficiency.

Multi‐objective optimization of a tubular permanent magnet linear generator with 120° phase belt toroidal windings using response surface method and genetic algorithm

“…To alleviate this problem, a TPMLG with 120 • phase belt toroidal windings (120 • -TPMLG) is proposed. Its analysis results show that the 120 • -TPMLG has the advantages that high-power density and high-efficiency [5]. However, the 120 • -TPMLG possess multiple structural parameters, and the interaction or even conflict among these structural parameters would have strong impact on generator performances in the optimization process.…”