Affiliations: [a] Institute of Mechanical and Electrical Engineering,
Heibei University of Engineering, Handan, Hebei, China | [b] Institute of Water Conservancy and Hydroelectric
Power, Heibei University of Engineering, Handan, Hebei, China | [c] Institute of Electrical Engineering, Xi'an Jiaotong
University, Xi'an, Shaanxi, China
Correspondence:
[*]
Corresponding author: Jingjun Zhang, Institute of Mechanical and
Electrical Engineering, Heibei University of Engineering, Handan, Hebei
056038, China. E-mail: [email protected]
Abstract: It is known that skewed rotor structure for electrical machines can
reduce torque ripple and radial force which will produce the unwanted vibration
and noise, however, utilizing this structure can also affect other parameters
of machine such as the average torque, the inductance, the flux-linkage and the
magnetic energy and so on. This drawback always shows in the special and
popular machines-switched reluctance motors. In this paper, different skewed
angles of rotor and their effects on the key electromagnetic parameters are
analyzed for switched reluctance motor. During the whole analysis process,
three-dimensional finite element method is used to model, mesh, solve, and plot
the results. Especially, the properties of the magnetic materials, the complex
motor geometry, the effects of magnetic saturation and end windings were
considered. Simulated and compared results show that an appropriate skewed
angle selected can reduce the radial force largely but not make the average
torque decreasing badly, which can be observed from the final conclusion: under
the skewed angle of 5°, the radial force is reduced of 56.2%, the average
torque is only reduced of 18.9%. So, if the target of designing for switched
reluctance motors is to reduce the vibration and noise to be the most extent,
then selecting an appropriate skewed structure for rotor shape is an effective way.
Keywords: Switched reluctance motors, electromagnetic, skewed angle, FEM
