Switched reluctance machines (SRMs) are one of the strong
candidates, and they have some advantages, such as low-cost
physical configuration, simple magnetic structure, and no PMs
on the rotor. However, low performance in efficiency and
power density is a major demerit compared with IPMSMs.
To improve the performance, an SRM made of supercore that
has extremely high permeability and low core loss due to
the lamination thickness of 0.1 mm has been reported in [1].
Efficiency has been successfully improved by the special grade
of silicon steel known as supercore, but there is still a big
bottleneck due to their inherent problems, which are high
torque ripple, unique inverter circuit, and expensive production
cost because of employing supercore.