Experimental Comparison of Conventional and Bus-Clamping PWM Methods Based on Electrical and Acoustic Noise Spectra of Induction Motor Drives

Abstract

The acoustic noise emitted by an induction motor, powered by a voltage source inverter, is an environmental issue. Harmonics present in the stator current are the main reason for the increased acoustic noise in motor drives. The pulse-width modulation (PWM) technique used to modulate the inverter is a key factor determining the magnitude of current harmonics. Busclamping pulse-width modulation (BCPWM) techniques have got much attention nowadays due to reduced switching loss, compared to conventional space vector PWM (CSVPWM). In this paper, two BCPWM techniques namely, 60 • and 30 • BCPWM methods are compared with CSVPWM on the basis of electrical spectra as well as acoustic noise spectra. Experiments are conducted on a pulse-width modulated voltage source inverter fed induction motor drives. Harmonic analysis is carried out on the measured line to line voltage, stator current and acoustic noise, corresponding to the three methods, at different fundamental and carrier frequencies. Based on the magnitude and phase of current harmonics, the frequency and normalized magnitude of dominant magnetic force waves are predicted theoretically. Theoretical predictions and experimental results both show that the magnitudes of dominant acoustic noise components around the carrier frequency are reduced significantly with these BCPWM methods, compared to CSVPWM. Further, it is shown that 30 • BCPWM is better than 60 • BCPWM in terms of acoustic pleasantness.

Analysis of the Acoustic Noise Spectrum of Domestic Induction Heating Systems Controlled by Phase-Accumulator Modulators

“…Acoustic noise has been extensively analyzed in the field of electric motors in the literature [12]- [17]. However, there are few articles on this subject in the field of domestic IH.…”

“…The Spectral Flatness Measure (SFM) [27] will be used to quantify the noise-like or tone-like nature of the spectrum of i 2 L in the band [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. For tonal signals, SFM is close to 0; and it is close to 1 for noise signals.…”

Experimental study of PWM strategy effect on acoustic noise generated by inverter‐fed induction machine

“…Given the widespread use and various advantages associated with these techniques, it would be interesting to study their performance in terms of acoustic noise. The evaluation of SVPWM, SHEPWM, and RPWM in terms of harmonic and acoustic performances has not been studied much, with the exception of the SVPWM technique . Therefore, this paper proposes a study on the effect of SVPWM, RPWM, and SHEPWM techniques in terms of acoustic noise emitted by an IM powered by a three‐phase two‐level inverter.…”

“…The evaluation of SVPWM, SHEPWM, and RPWM in terms of harmonic and acoustic performances has not been studied much, with the exception of the SVPWM technique. 2,14,15,19 Therefore, this paper proposes a study on the effect of SVPWM, RPWM, and SHEPWM techniques in terms of acoustic noise emitted by an IM powered by a three-phase two-level inverter. The effect of PWM techniques is also based on the PWM harmonics as well as the acoustic noise spectra.…”

Acoustic-Based Fault Diagnosis of Commutator Motor

“…They are used for various types of machines and faults. Faults of electrical rotating motors (stator faults, rotor faults, broken rotor bar, ring cracking, bearing failures, rotor shaft failure, air-gap irregularities, broken teeth on sprocket) can be diagnosed by vibration [1][2][3][4][5][6][7][8][9][10][11][12] and acoustic signals [13][14][15][16][17][18][19][20][21][22]. Electric current analysis [23][24][25][26][27][28][29][30][31] and thermal analysis [32][33][34] are mostly used for limited faults, such as stator faults, rotor faults, and bearing failures.…”