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Experimental research on structure-borne noise at pulse-width-modulation excitation

机译：脉宽调制激励下固体声的实验研究

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Pulse-width modulation (PWM) is widely used in motor control and represents a carrier-frequency-dependent structural excitation. The PWM's excitation harmonics are also reflected in an air gap's electromagnetic forces, the transmitted bearing forces and the resulting structure-borne noise. Inappropriate carrier-frequency selection can cause additional electromagnetic noise. The latter can be reduced by a characterization of the coupling between the excitation harmonics and the structural dynamics. To obtain a clear insight into the physical phenomenon, an experiment with original motor parts is proposed, which introduces bearing force measurement and excludes the aerodynamic and mechanical sources of noise. The detailed dependence of the structure-borne noise on the PWM carrier frequency can be obtained by dense carrier-frequency measurements. The experimental results show that even at higher frequencies (above 10 kHz), the carrier-frequency selection can cause a 25 dB(A) difference in the total sound pressure level. The switching noise of PWM controlled machines can be reduced by the appropriate carrier-frequency selection in accordance with the structural dynamics.
机译：脉宽调制（PWM）广泛用于电机控制中，代表了与载波频率相关的结构激励。 PWM的励磁谐波还反映在气隙的电磁力，传递的轴承力以及由此产生的结构噪声中。载波频率选择不当会引起额外的电磁噪声。可以通过表征激励谐波和结构动力学之间的耦合来减少后者。为了获得对物理现象的清晰了解，提出了使用原始电机零件的实验，该实验引入了轴承力的测量，并排除了空气动力学和机械噪声源。可以通过密集的载波频率测量来获得结构噪声对PWM载波频率的详细依赖性。实验结果表明，即使在较高频率（10 kHz以上）下，载频选择也会导致总声压级相差25 dB（A）。通过根据结构动态选择合适的载波频率，可以降低PWM控制电机的开关噪声。

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