Abstract
Vibration and noise parameters have a significant influence on the performance of permanent magnet motor (PMM). A new method of reducing vibration and noise of PMM was proposed in this study by optimizing the stator teeth profile. The optimal offset distance was determined by finite element method, and the results indicate that the vibration and noise amplitude become larger when the frequency is an even multiple of the fundamental frequency. The maximum and average vibration acceleration of the optimized PMM is reduced by 22.27% and 11.11%, respectively, and the total sound pressure level (SPL) is decreased by 3.67%. Finally, the correctness of the theoretical parameters was verified by the vibration and noise measuring experiment. The experimental data suggest that the average acceleration error is 7.07%, and the average SPL error is 2.28%. The research methods and conclusions of this study may be extended to the vibration and noise optimization of other PMM.
Highlights
Permanent magnet motor (PMM) has a series of advantages, such as high efficiency, high power density, good speed regulation characteristics, and so on .1–4 The excitation field of PMM is built up by the permanent magnet rather than the excitation winding .5–6 In this way, the copper consumption and resistance loss of PMM can be greatly reduced .7–8Vibration and noise parameters have become key indicators to measure the performance of PMM .9–10 In general, the vibration and noise generated by PMM will be directly or indirectly transmitted to the human ear .11–12 Vibration accelerates fatigue damage and energy consumption and causes subjective discomfort
The results suggest that it is a necessary way to reduce the electromagnetic vibration and noise of PMM by changing the distribution of radial electromagnetic force (REF)
The maximum and average vibration acceleration of the optimized PMM is decreased by 22.27% and 11.11%, respectively, and the total sound pressure level (SPL) is reduced by 3.67%
Summary
Permanent magnet motor (PMM) has a series of advantages, such as high efficiency, high power density, good speed regulation characteristics, and so on .1–4 The excitation field of PMM is built up by the permanent magnet rather than the excitation winding .5–6 In this way, the copper consumption and resistance loss of PMM can be greatly reduced .7–8. One significant study by Scuiller et al (2014) found that the vibration and noise of PMM can be reduced by slotting the rotor In this way, the harmonic waves of the magnetic induction intensity (MII) of the air gap can be effectively suppressed .20. The most commonly used methods for PMM vibration and noise reduction are to optimize the permanent magnet and the stator modal parameters. The study presented here is one of the first investigations to explore reduce method of the electromagnetic vibration and noise of PMM by optimizing the stator tooth profile. The electromagnetic vibration and noise parameters of the original PMM and the optimized PMM were simulated In this process, the REF was coupled to the stator teeth as an excitation source. The accuracy of the theoretical analysis is verified by the experimental results
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