摘要：Alternatives to hydraulic drives that used on vehicles are necessary in order to reduce the
Carbon dioxide ( CO2
) emission and oil consumption. Hence better performance and efficiency
of the vehicles can be achieved by using free piston engine, in which the piston reciprocate
linearly with a permanent magnet linear generator (PMLG) without the need of a crankshaft.
The PMLG has high performance, but suffering from the cogging force. The cogging force
induces undesired vibration and acoustic noise and makes a ripple in the thrust force.
Moreover, the cogging force deteriorates the control characteristics, particularly in terms of the
position control and speed precisely. This paper proposes
Somaloy to replace the laminated silicon steel sheets in order to reduce the cogging force in a
PMLG. Through a finite-element analysis, it has been shown that, the stator core made of
Somaloy minimizes the cogging force of the PMLG, moreover, giving larger flux-linkage and
back-electromotive force
(B-EMF), respectively.
