An Investigation of Tangential Force and Radial Force in PM Motor by means of FEM-simulation

Hong, Jianfeng; Gui, Liang Jin; Cao, Jiuwen

doi:10.1109/icem51905.2022.9910714

Cited by 3 publications

(2 citation statements)

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“…In the 9S6P motor, all high-order radial AEFD waves are modulated into 0th or 3rd-order force waves. Similarly, when the pole-slot combination of the motor satisfies (21), the motor exhibits a strong modulation effect of high-order force waves, significantly contributing to the motor's vibration. For instance, the modulation force harmonic component of the 12S8P motor only contains 4th-order force waves, while the 12S10P poleslot combination includes 2nd, 4th, and 6th-order components.…”

Section: Higher-order Force Wave Modulation Effectmentioning

confidence: 99%

“…Yin et al [19] through a force conversion model quantitatively analyzed the contribution of radial modulation force to air-gap flux density (AFD) amplitude and modulation coefficient under no-load motor conditions but did not consider the contribution of tangential AEFD to vibration and the contribution of different harmonic orders of AEFD to modulation force. Furthermore, some researchers have studied tangential forces [20], [21] and found that tangential forces, as an objective local force, can either reduce or amplify vibrations caused by radial forces in different scenarios. The studies mentioned above indicate that the previous methods for analyzing motor vibrations have limitations because highorder electromagnetic force harmonics induce low-order modal deformations in the motor due to the modulation effect of the stator's slot structure on high-order electromagnetic force waves.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of Noise Sources in Fractional-Slot Concentrated Winding Motors Considering High-Order Radial/Tangential Electromagnetic Force Combination and Modulation

Rao,

Rong,

Gan

et al. 2023

IEEE Access

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Traditional methods equate the slotted stator as an unslotted model and employ an approximation where the stator deformations are considered inversely proportional to the fourth power of the order of air-gap electromagnetic force density (AEFD). This approach effectively overlooks the contributions of high-order forces. Furthermore, it overlooks the influence of tangential forces, as radial forces typically have significantly greater amplitudes than tangential. However, the effectiveness of this method has been questioned. This study aims to establish a novel method for accurately identifying the harmonic components of AEFD responsible for vibration noise by investigating the electromagnetic vibration noise source in a 9slot/6-pole fractional-slot concentrated-winding interior permanent magnet synchronous machine (FSCW-IPMSM). Initially, the modulation law of high-order force waves is investigated through a force conversion model, revealing the mechanism behind the strong modulation effect of high-order force waves. Subsequently, a quantitative analysis modulation force model is proposed. Building on this foundation, a multi-physics field coupling simulation method is employed to predict the electromagnetic vibration noise influence mechanism of high-order radial and tangential AEFD, as well as their coupling effects. The results demonstrate that the vibration noise at the frequency of 18fe in this motor is primarily induced by the coupling effects of highorder radial and tangential AEFD components. Neglecting the contribution of tangential AEFD significantly underestimates the actual vibration levels in the motor. The research outcomes emphasize the importance of considering tangential AEFD and high-order force modulation effects, providing a fresh perspective for accurately predicting the electromagnetic vibration sources in FSCW-IPMSM. INDEX TERMSFractional-slot concentrated-winding machine, high-order electromagnetic force, radial and tangential force, force modulation effect, motor noise source identification.

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Section: Higher-order Force Wave Modulation Effectmentioning

confidence: 99%