Acoustic noise, vibration, harmonics, thermal of three phase linear switched reluctance machines

Acoustic noise in the linear switched reluctance motor (LSRM) is caused primarily by the deformation of the stator lamination stack. Acoustic noise is most severe when the periodic excitation of the LSRM phases excites a natural vibration mode of the stack. Noise and vibration are usually high in LSRM because of doubly salient structures. The natural vibration modes and frequencies of a three-phase LSRM are examined. Structural finite element analysis (FEA) is used to compute the natural modes and frequencies. A harmonic analysis to identify the range of speeds producing high vibration and noise that should be skipped over quickly during acceleration is studied. Apart from vibration, noise and harmonic analysis, a detailed electromagnetic and thermal analysis of the proposed LSRM using FEA are presented.