Abstract
This study deals with the noise, vibration, and harshness (NVH) characteristic analysis of permanent magnet synchronous motors (PMSMs) for electrical machines, such as electrically driven tools that are used in industries. An improved NVH design is needed for application to industrial tools. In general, the electromagnetic NVH characteristics of PMSMs are classified into electromagnetic excitation sources, such as total harmonic distortion of EMF, torque pulsation, magnetic pull force, and unbalanced magnetic force (UMF). This study compares the vibration and noise generated by fractional pole/slot combinations. In PMSMs with fractional pole/slot combinations, UMF is an important NVH source. PMSMs generate UMF because of armature reaction fields based on the pole/slot combinations and harmonics of magnetic flux density. UMF was derived using the finite element method, and the rotor vibration analysis was performed using electromagnetic mechanical coupling analysis. The analysis results and the effect of electromagnetic excitation characteristics on the rotor vibration of the PMSMs were compared and analyzed.
Highlights
In recent times, permanent magnet synchronous motors (PMSMs) have been widely used in industries because of their various advantages, such as high-speed operation, high efficiency, and compact design [1,2,3,4]
Previous studies have reported that vibration characteristics can be improved by decreasing torque pulsation; these are related to the noise characteristic of PMSMs [5,6,7,8]
2 ofby decreasing torque pulsation; these are related to the noise characteristic of PMSMs [5,6,7,8]
Summary
Permanent magnet synchronous motors (PMSMs) have been widely used in industries because of their various advantages, such as high-speed operation, high efficiency, and compact design [1,2,3,4]. MPF is caused by the distribution of magnetic flux density that is the product of the magnetic flux density that is the product of the winding pattern and the slotting effect. Shape of the machines [12] Based on these studies, the asymmetry of MPF affects UMF and increases. D.Y. Kim conducted a study on vibration reduction based on pole/slot combinations for combinations forelectromagnetic the reduction ofvibration electromagnetic vibration source [13]. Wewe have analyzed the influence each vibration source by experiments conducting and electromechanical coupled analysis using finite element method (FEM). Compared the experiments and electromechanical coupled analysis using finite element method (FEM) and results with two different fractional pole/slot combinations.
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