考虑磁致伸缩效应的永磁同步电机磁-机械耦合模型

在永磁同步电机振动噪声的计算过程中,需考虑磁致伸缩效应的影响。建立了考虑磁致伸缩效应的定子铁心磁-机耦合模型,解析计算了电磁力密度及磁致伸缩力密度。数值计算了定子振动位移、振动速度和声压分布。所得结果与定子铁心在电磁力单独作用下的振动噪声响应进行了对比。在考虑磁致伸缩效应时,定子齿径向力密度幅值比电磁力单独作用时增加了13.1%,定子铁心的变形量比电磁力单独作用时变形量增加了13.4%,声压级也明显增加。对比表明,磁致伸缩效应对于电机振动噪声有重要贡献。在低噪声永磁同步电机的研发设计阶段,不能忽略磁致伸缩效应的影响。

Magnet-Mechanical Coupling Model of PMSM Considering Magnetostrictive Effect

The effect of magnetostriction must be considered in the calculation of vibration and noise of PMSM.The magnetomechanical coupling model of stator core considering magnetostrictive effect was established,and the electromagnetic force density and magnetostrictive force density were calculated analytically.The stator vibration displacement,vibration velocity and sound pressure distribution were calculated.The results were compared with the vibration and noise response of stator core under the electromagnetic force alone.When considering the magnetostriction effect,the radial force density amplitude of stator teeth increased by 13.1%compared with that under the electromagnetic force alone,the deformation of stator core increased by 13.4%compared with that under the electromagnetic force alone,and the sound pressure level also increased significantly.It shows that magnetostrictive effect has an important contribution to the vibration and noise of motor.Therefore,the effect of magnetostriction cannot be ignored in the research and design stage of low noise permanent magnet synchronous motor.