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MMM 2022

November 07, 2022

Minneapolis, United States

Analysis and Measurements of Influence of Current Harmonics on Vibration of High Speed Motors with Rare

Recently, high-speed permanent magnet motors have been used in various fields by applying rare-earth permanent magnets. Because they rotate at high speeds, the effects of noise, vibration, and harshness (NVH) should be analyzed for mechanical stability. Based on many studies, electromagnetic-exciting sources affecting NVH are classified into cogging torque, torque ripple, electromagnetic force density distribution (MPF), and unbalanced electromagnetic force 1-2. Therefore, an analysis reflecting the complex excitation source is required in designing a stable high-speed motor 3. In this study, after analyzing the effect of carrier harmonics generated in the pulse-width modulation control method on the electromagnetic-exciting source through dynamic simulations, the unbalanced electromagnetic force was derived. Finally, the effect on the mechanical aspects was analyzed.
Fig. 1(a) shows the 3D structure of the proposed model, and Fig. 1(b) shows the experimental set. Fig. 1(c) and (d) show the variations in the current and magneto-motive force (MMF) waveforms, respectively, according to carrier harmonics through dynamic simulation. Fig. 2(a) shows the UMF of the armature reaction, and Fig. 2(b) shows the harmonics of the torque. The NVH analysis results based on these effects are shown in Fig. 2(c) and (d). Fig. 2(c) shows the NVH when a sinusoidal current is applied, and Fig. 2(b) shows the NVH when the inverter generates a harmonic current. Based on the analysis results, it was confirmed that the higher the vibration order of the frequency related to the unbalanced electromagnetic force, the more significant its influence on the vibration and noise.
These results indicate that vibration and noise analyses considering the inverter are essential in the design and performance analysis of high-speed motors. Detailed comparative analysis and experimental results will be presented in the complete paper.

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Chengcheng Liu and 2 other authors

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