IEEE Power Electronics Magazine - June 2014 - 35

Ultraslim IPTSs for RPEVs

structure core, as shown in Figure 6,
was suggested and registered as a patent [12]. Figure 7 shows the W-type
power-supply rail of the 3G OLEV [4]
under road construction in (a) and
under test in (b).
Despite the large gap between
cores, the generated magnetic flux
decreases a little bit, while concrete
can percolate down through the bone
structure cores. Therefore, the power-supply rail has almost the same
endurance of concrete, as shown in
Figure 8.
The fourth-generation (4G) OLEV
showed more practical performance
characteristics, such as a very narrow rail width of 10 cm, a larger lateral displacement of 40 cm, a lower
electromagnetic field (EMF) level,
and lower power-rail construction
cost compared with the previous
generations of OLEV. Recently, the
KAIST team led by Prof. Rim has

As shown in Figure 5, the first generation (1G) was a concept demonstration car of the OLEV, and the second
generation (2G) was for OLEV
buses. The third generation (3G)
was for an OLEV passenger car and
three OLEV trains (3 +G) that have
been successfully deployed at the
Seoul Grand Park, Korea, since 2010.
Two updated OLEV buses (3 + G)
were deployed at the 2012 Yeosu
EXPO, Korea, and another two
OLEV buses (3+G) have been in full
operation at the main campus of
KAIST since 2012. Recently, two
OLEV buses (3+G) have been commercialized at the 48-km long-distance route in Gumi, Korea.
One of the problems found during the development of 2G OLEV was
the inherently weak structure of the
power-supply rail. As a remedy for
this mechanical weakness, a bone

developed a prototype of the fifthgeneration (5G) OLEV, which has
a foldable ultraslim S-type powersupply module of 4-cm width and
needs no cable connection after
being deployed, as shown in Figure
9. It will significantly reduce the
construction cost and time. The 5G
power-supply module is under development. The Korean government has
strongly supported this OLEV project by providing funding of about
US$50 million.

ORNL: Power Electronics
and Electric Machinery Group
Researcher Omer C. Onar reported
that ORNL is developing more efficient coil designs with high misalignment tolerance and minimal fringe
(leakage) field emissions. In addition, it is also developing highly efficient power electronics converters
and new control strategies for this

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June 2014

z IEEE PowEr ElEctronIcs MagazInE

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Table of Contents for the Digital Edition of IEEE Power Electronics Magazine - June 2014