Electromagnetic Vibration and Noise Suppression of Induction Motor Based on RPWM Selective Spectrum Shaping

Abstract

In AC motor powered by frequency converter, the random pulse width modulation (RPWM) can suppress vibration and noise power near the switching frequency and its integer multiple of the inverter. However, the traditional RPWM strategy cannot selectively eliminate the special frequency harmonics, such as the frequency that causes strong electromagnetic vibration and noise of the motor. A method of suppressing electromagnetic vibration and noise of induction motor based on RPWM selective spectrum shaping is proposed. Firstly, according to three different pulse positions, the general formula of selective harmonic elimination of RPWM is derived, so as to selectively eliminate the harmonic noise power at a specific frequency and its integer multiple. On this basis, further spectrum shaping can be realized by reasonably selecting the effective random number to avoid the inverter switching frequency distributing in a specific frequency band. The simulation and experimental results show that the method can not only suppress the vibration and noise near the integer times of the switching frequency, but also selectively suppress the electromagnetic vibration and noise at other frequencies.INDEX TERMS RPWM, selective harmonic elimination, invert, induction motor.

Stator Current Spectral Content of Inverter-Fed Cage Rotor Induction Motor

“…The ongoing need to limit the use rare earths due to fluctuating cost, environmental and availability issues is promoting a renewed interest in the exploitation of induction motors [4] as preferred alternative to permanentmagnet machines whenever possible. For sure, more and more efforts are being placed on the attempt to improve the performance of induction motors under various respects, such as increasing their efficiency to meet present energy saving standards and targets [5] as well as reducing noise and vibrations [6]. These targets apply to traditional mainsfed motor but are even more relevant to inverter-fed motors, which account for the vast majority today thanks to their capability of operating at variable speed.…”

“…Several approaches can be pursued to improve the performance of inverter-fed induction motor. Recent interest approaches have been proposed based on advanced and smartly designed supply, automation and management techniques where the main focus is on the inverter technology and control [2], [3], [5], [6]. In contrast, an apparent lack appears in the literature regarding the potentials of acting on the induction motor design to optimize its operation when supplied from a PWM inverter.…”

Development of performance characterization in VSI-fed induction motor drives using random PWM

“…To meet out these demand from the PWM, the paper proposed a hybrid PWM combining conventional RPWM with ramdom carrier and SVPWM [22] few work is persented in PWMs gerneration spreading harmonics reduction to improve the the system's harmonic effects. Nevertheless, those methods ignore the acoustic noise effects and maximum possbile DC-link volatge utilizations [23]- [26]. random space vector pulse width modulation for noise reduction in VSI-fed induction motor cloud system model incoprated [27].…”

Modified Multiverse Optimizer Selective Harmonic Elimination for Five-Level Modified Packed U-Cells Inverter and Analysis of Motor Torque Ripple Suppression

“…e high-order harmonics of the inverter power supply are one of the reasons which a ect the smoothness of the motor output torque [1]. From the perspective of controlling the harmonics of the inverter output, the methods of reducing the electromagnetic noise and torque ripple of the motor include software lter algorithms and hardware lters [2], increasing the switching frequency [3], dynamically adjusting the switching frequency [4,5], the random PWM (pulse width modulation) strategy [6][7][8], improving the topology of the inverter [9,10], and eliminating speci c harmonics [11]. Ref.…”

“…Ref. [6] provides a method to reduce the noise and electromagnetic vibration caused by induction motor through RPWM (random pulse width modulation) selective spectrum shaping.…”