بحث بعنوان General Power Equation of Switched Reluctance Machines and Power Density Comparison

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General Power Equation of Switched Reluctance Machines and Power Density Comparison
Wei Hua, Senior Member, IEEE, Guishu Zhao, Hao Hua, Student Member, IEEE, and Ming Cheng, Fellow, IEEE

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Abstract—Switched reluctance machines (SRMs) are
increasingly attractive due to their inherent advantages, such as
robust and rare-earth-PM-free topology as well as excellent faulttolerance and temperature management. However, the accurate
and efficient analyses of SRMs are always challenging since they
operate with variable reluctance and pulsating excitation,
suffering severe nonlinear characteristics. This paper firstly
introduces a general power equation of SRMs, which can be a
powerful tool in the investigation of SRMs. Then the proposed
power equation is validated by finite element (FE) results and
experimental results with different excitations. Afterwards, the
calculated results with various conditions, including different
stator inner diameter and different stator outer diameter are
compared with the FE-predicted results. Finally, the comparison
between SRMs and several conventional machines is carried out
to evaluate the power density of SRMs.
Keywords—Finite element; power density; power equation;
switched reluctance machine; torque density.
CONCLUSIONS
This paper introduces a general power equation for SRMs
based on the energy conversion process, which is quite different
from the conventional AC machines. The equation is derived
from the operating features of SRMs and several specific
factors, including energy conversion ratio, current profiling and
power waveform modifications, are considered. Then, an
existing prototype is measured to validate the proposed power
equation. The calculated results from the proposed power
equation agree well with the FE predictions and the measured
results. Afterwards, the correctness of the power equation is
comprehensively validated by comparing the calculated results
with the FE-predicted results in different conditions, including
different stator inner diameter and different stator outer
diameter. Finally, the power density equation of SRMs is
presented and the comparison between the SRMs and two
conventional machines is carried out. The results roughly show
that the SRMs perform lower power density than the DSPM
machines but comparable power density as the IMs. It is
believed that the proposed power density can provide a
powerful tool for the preliminary design and analysis of SRMs.

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