Abstract
Compared with internal-rotor switched reluctance motors (SRMs), external-rotor (ER) SRMs can show different vibration and acoustic noise behavior due to the differences in the designs, e.g. thinner rotor back iron to achieve smaller inertia, and longer stator pole height to improve the electromagnetic performance. This paper presents the considerations in the modeling and analysis of the acoustic noise sources of an ER SRM stator and rotor. The harmonic components of the stator tangential force density and rotor radial force density are analyzed and compared. The vibration modes, the vibration behavior, and acoustic noise of the stator and rotor are also compared. A 12/16 external-rotor SRM designed for a direct-drive E-bike application is used for the modeling, analysis, and experimental validation of vibration and acoustic noise. It is concluded that both the stator tangential vibration and the rotor radial vibration can be sources of the acoustic noise in an ER SRM.
Highlights
Low acoustic noise is often desired in the design of externalrotor motors for acoustic-noise-sensitive applications, e.g. E-bike applications
It has not been studied in detail in the literature whether the tangential vibration in the stator of ER SRM can contribute to the total acoustic noise
This paper aims to model and analyze the vibration behavior and the acoustic noise in ER SRMs
Summary
Low acoustic noise is often desired in the design of externalrotor motors for acoustic-noise-sensitive applications, e.g. E-bike applications. Recent studies on the modeling and analysis of the acoustic noise in permanent magnet synchronous external-rotor (ER) motors have been presented in [1]–[4]. A limited number of studies have been conducted for the modeling and analysis of the acoustic noise in ER SRMs [5]. It has not been studied in detail in the literature whether the tangential vibration in the stator of ER SRM can contribute to the total acoustic noise. Due to the solid rotor structure of the internal-rotor SRMs, the acoustic noise caused by the vibration of the rotor is often negligible. The acoustic noise caused by the tangential vibration of the stator and rotor poles is often negligible
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