Abstract
This paper presents study of a multi-slice subdomain model (MS-SDM) for persistent low-frequency sound, in a wheel hub-mounted permanent magnet synchronous motor (WHM-PMSM) with a fractional-slot non-overlapping concentrated winding for a light-duty, fully electric vehicle applications. While this type of winding provides numerous potential benefits, it has also the largest magnetomotive force (MMF) distortion factor, which leads to the electro-vibro-acoustics production, unless additional machine design considerations are carried out. To minimize the magnetic noise level radiated by the PMSM, a skewing technique is targeted with consideration of the natural frequencies under a variable-speed-range analysis. To ensure the impact of the minimization technique used, magnetic force harmonics, along with acoustic sonograms, is computed by MS-SDM and verified by 3D finite element analysis. On the basis of the studied models, we derived and experimentally verified the optimized model with 5 dBA reduction in A-weighted sound power level by due to the choice of skew angle. In addition, we investigated whether or not the skewing slice number can be of importance on the vibro-acoustic objectives in the studied WHM-PMSM.
Highlights
IntroductionAmong all main sources of acoustic noise, such as mechanical and aerodynamic, the magnetic source can be very critical in many applications (transport systems, aerospace, electric vehicle (EV)
Among all main sources of acoustic noise, such as mechanical and aerodynamic, the magnetic source can be very critical in many applications (transport systems, aerospace, electric vehicle (EV)motors, etc.), in high-torque motors, where a large number of poles and a thinner stator yoke always result in a medium mechanical stiffness
This paper investigates the impact of a skewing technique to minimize the vibration level power and audible magnetic noise on a wheel hub-mounted permanent magnet synchronous motor (WHM-PMSM) using a multi-slice subdomain model (MS-SDM) with use of non-overlapping Fractional-slot concentrated windings (FSCW)
Summary
Among all main sources of acoustic noise, such as mechanical and aerodynamic, the magnetic source can be very critical in many applications (transport systems, aerospace, electric vehicle (EV). Motors, etc.), in high-torque motors, where a large number of poles and a thinner stator yoke always result in a medium mechanical stiffness. This induces magnetic vibration due to magnetic forces which consist of Maxwell and magnetostrictive forces. The acoustic noise needs special attention because of the small number of slots per pole per phase q, which causes large magnetomotive force (MMF). The first attempt to reduce magnetic vibrations and acoustic noise produced in the electrical machines via Maxwell forces has been modeled in Reference [9,10]. Distortion due to low-order harmonics in the spatial distribution of the radial forces in comparison to other traditional permanent magnet (PM) machines [6,7,8].
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