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.

Citation

Si, J., Yan, Z., Nie, R., Xu, S., Gan, C. and Cao, W. (2021), "Design and analysis of tubular permanent magnetic linear generator with 120° phase belt toroidal windings", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 40 No. 4, pp. 783-801. https://doi.org/10.1108/COMPEL-08-2020-0289