Abstract
This paper presents a comparison of efficiency and mover mass on a double-sided permanent magnet linear synchronous generator (PMLSG) according to its magnetization pattern. When a PMLSG has a lighter mover, it has advantages such as lower cost and other aspects regarding mechanical losses. In general, PMLSGs are used with a vertical PM pattern, but we propose a horizontal PM pattern in this paper because the horizontal PM mover does not need a back-iron for the magnetic path. Electromagnetic field analysis is especially essential when analyzing the characteristics of PMLSGs. For this type of analysis, commercial finite element analysis tools are widely used because they offer convenient user interfaces that provide very accurate analytical results. Based on two-dimensional finite element analysis, we got results for two different patterns and compared them with our experimental results. Finally, the results of this analysis and the test results obtained confirm the validity of the model and the superiority of the horizontal pattern proposed in this paper.
Highlights
Most permanent magnet synchronous generators (PMSGs) are of the rotary type because these generators are efficient at transforming rotational kinetic energy into electrical energy
Double-sided permanent magnet linear synchronous generator (PMLSG) generally use a vertical permanent magnet (PM) magnetization pattern but, in this paper, we propose a horizontal PM pattern
While PM mass is greater for the horizontal pattern, there is a difference of about 60% between the vertical and horizontal pattern’s mover core mass
Summary
Most permanent magnet synchronous generators (PMSGs) are of the rotary type because these generators are efficient at transforming rotational kinetic energy into electrical energy. Permanent magnet linear synchronous generators (PMLSGs) are more effective than rotary generators because they do not need transmission systems and achieve higher efficiency and performance. For this reason, linear generators are widely studied for various applications such as wave energy converters, free-piston engine generators, and energy harvesting. Vertical PM movers are heavier than horizontal PM movers because they need a back-iron for the magnetic path We compare these magnetizations patterns based on the characteristics of double-sided PMLSGs in slotted stator structures, where PMs are arranged in one of the two patterns.
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