Abstract
Acoustic noise and vibration is one of the shortcomings of a switched reluctance machine (SRM). Harmonics of the radial force waveform in the airgap excite the stator structure at different vibration modes with specific frequencies. The radial force density in the airgap should be calculated before analyzing and mitigating acoustic noise and vibration. This paper proposes a reluctance mesh-based magnetic equivalent circuit (MEC) model to calculate the airgap radial force density. Reluctance mesh-based MEC models are developed for 3-phase 6/4, 6/16, 12/8 and 4-phase 8/6, 8/10, and 16/12 SRMs. A technique for the dynamic modeling of SRMs is proposed using the reluctance mesh-based MEC method. Dynamic currents are calculated using the proposed technique and, then, the radial and tangential flux density in the airgap are calculated. The radial force density in the airgap is calculated by applying the Maxwell Stress Tensor method. Fourier series is used to calculate the harmonics of the radial force density. The results obtained from the MEC model are verified using finite element method (FEM) models. The implemented MEC-based dynamic modeling method is validated using experimental results.
Highlights
Switched reluctance machine (SRM) is a strong candidate as an alternative to permanent magnet synchronous machines (PMSM) in electrified transportation systems [1]
The excitation frequencies of the radial force density harmonics corresponding to different temporal orders are called the forcing frequencies, and they are defined as ffc = |u|fmech where fmech is the mechanical frequency of the rotor
This paper presents a radial force density calculation method using the reluctance mesh-based magnetic equivalent circuit (MEC) method
Summary
Switched reluctance machine (SRM) is a strong candidate as an alternative to permanent magnet synchronous machines (PMSM) in electrified transportation systems [1]. Utilizing the conventional MEC method for calculating radial force density in the SRM design requires predefining the flux path in the SRM using FEM in each design iteration. It is required to predefine the flux path at different rotor positions for each pole configuration if the conventional MEC method is applied to calculate the radial force density. The reluctance mesh-based MEC method has not been applied in the literature to calculate the radial forces in an SRM. A 2-dimensional (2D) reluctance mesh-based MEC method is proposed in this paper for calculating the radial force density in an SRM.
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