Acoustic noise radiated from direct torque controlled induction motor drives

Lie Xu, Z.Q. Zhu, D. Howe

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Acoustic noise emissions from a direct torque controlled (DTC) induction motor drive are investigated. Due to the hysteresis control of the flux and torque, DTC results in a variable switching frequency and dispersed voltage and current harmonic spectra. It is shown that both the bandwidths of the flux and torque hysteresis controllers and the equivalent modulation indices can have a significant influence on the switching frequency and the spread spectrum of the harmonic content. The acoustic noise is compared with that which results with space vector PWM (SVPWM) and random PWM (RPWM), and is shown that, in contrast to SVPWM, which results in cluster harmonic spectra and tonal acoustic noise, DTC and RPWM controlled drives have similar spread spectrum features and atonal noise emissions which are generally regarded as less irritating. However, the wideband of their harmonic spectra is more likely to induce mechanical resonances, and thus may sometimes result in higher noise emissions. The influence of the load and the flux level on the emitted noise is investigated, and it is shown that the noise level increases with the load, but there is an optimal flux level for minimal noise.
Original languageEnglish
Pages (from-to)491-496
Number of pages6
JournalIET Electric Power Applications
Volume147
Issue number6
DOIs
Publication statusPublished - Nov 2000

Fingerprint

Acoustic noise
Induction motors
Torque
Pulse width modulation
Fluxes
Switching frequency
Vector spaces
Hysteresis
Modulation
Bandwidth
Controllers
Electric potential

Keywords

  • acoustic noise
  • induction motor drives
  • magnetic variables control
  • cluster harmonic spectra
  • controller bandwidth

Cite this

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title = "Acoustic noise radiated from direct torque controlled induction motor drives",
abstract = "Acoustic noise emissions from a direct torque controlled (DTC) induction motor drive are investigated. Due to the hysteresis control of the flux and torque, DTC results in a variable switching frequency and dispersed voltage and current harmonic spectra. It is shown that both the bandwidths of the flux and torque hysteresis controllers and the equivalent modulation indices can have a significant influence on the switching frequency and the spread spectrum of the harmonic content. The acoustic noise is compared with that which results with space vector PWM (SVPWM) and random PWM (RPWM), and is shown that, in contrast to SVPWM, which results in cluster harmonic spectra and tonal acoustic noise, DTC and RPWM controlled drives have similar spread spectrum features and atonal noise emissions which are generally regarded as less irritating. However, the wideband of their harmonic spectra is more likely to induce mechanical resonances, and thus may sometimes result in higher noise emissions. The influence of the load and the flux level on the emitted noise is investigated, and it is shown that the noise level increases with the load, but there is an optimal flux level for minimal noise.",
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Acoustic noise radiated from direct torque controlled induction motor drives. / Xu, Lie; Zhu, Z.Q.; Howe, D.

In: IET Electric Power Applications, Vol. 147, No. 6, 11.2000, p. 491-496.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Acoustic noise radiated from direct torque controlled induction motor drives

AU - Xu, Lie

AU - Zhu, Z.Q.

AU - Howe, D.

PY - 2000/11

Y1 - 2000/11

N2 - Acoustic noise emissions from a direct torque controlled (DTC) induction motor drive are investigated. Due to the hysteresis control of the flux and torque, DTC results in a variable switching frequency and dispersed voltage and current harmonic spectra. It is shown that both the bandwidths of the flux and torque hysteresis controllers and the equivalent modulation indices can have a significant influence on the switching frequency and the spread spectrum of the harmonic content. The acoustic noise is compared with that which results with space vector PWM (SVPWM) and random PWM (RPWM), and is shown that, in contrast to SVPWM, which results in cluster harmonic spectra and tonal acoustic noise, DTC and RPWM controlled drives have similar spread spectrum features and atonal noise emissions which are generally regarded as less irritating. However, the wideband of their harmonic spectra is more likely to induce mechanical resonances, and thus may sometimes result in higher noise emissions. The influence of the load and the flux level on the emitted noise is investigated, and it is shown that the noise level increases with the load, but there is an optimal flux level for minimal noise.

AB - Acoustic noise emissions from a direct torque controlled (DTC) induction motor drive are investigated. Due to the hysteresis control of the flux and torque, DTC results in a variable switching frequency and dispersed voltage and current harmonic spectra. It is shown that both the bandwidths of the flux and torque hysteresis controllers and the equivalent modulation indices can have a significant influence on the switching frequency and the spread spectrum of the harmonic content. The acoustic noise is compared with that which results with space vector PWM (SVPWM) and random PWM (RPWM), and is shown that, in contrast to SVPWM, which results in cluster harmonic spectra and tonal acoustic noise, DTC and RPWM controlled drives have similar spread spectrum features and atonal noise emissions which are generally regarded as less irritating. However, the wideband of their harmonic spectra is more likely to induce mechanical resonances, and thus may sometimes result in higher noise emissions. The influence of the load and the flux level on the emitted noise is investigated, and it is shown that the noise level increases with the load, but there is an optimal flux level for minimal noise.

KW - acoustic noise

KW - induction motor drives

KW - magnetic variables control

KW - cluster harmonic spectra

KW - controller bandwidth

U2 - 10.1049/ip-epa:20000682

DO - 10.1049/ip-epa:20000682

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VL - 147

SP - 491

EP - 496

JO - IET Electric Power Applications

JF - IET Electric Power Applications

SN - 1751-8660

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