EPE Association: EPE 1997 â€“ 36: Dialogue Session DS5f-1: CONVERTER MACHINE INTERACTIONS: ACOUSTIC NOISE

EPE 1997 â€“ 36: Dialogue Session DS5f-1: CONVERTER MACHINE INTERACTIONS: ACOUSTIC NOISE
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 â€“ 36: Dialogue Session DS5f-1: CONVERTER MACHINE INTERACTIONS: ACOUSTIC NOISE

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   THE CONTRIBUTION TO NOISE IN AN INDUCTION MACHINE, FED FROM A PULSE WIDTH MODULATED INVERTER
By Lars Laftman [View]
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Abstract: Pulse Width Modulated (PWM) inverter fed induction machines generate significant noise. There is a simple relation between the inverter harmonics and the machine noise, and with this, it is easy to design quieter inverter drives. The noise comes not only from radial airgap forces but also from magnetostriction. A FEM model has been derived for calculation of magnetostrictive deformation of the stator. The FEM model has been verified on a test machine in which the radial airgap forces have been eliminated. It turns out that magnetostrictive and radial airgap forces have about the same magnitudes. Measurements with the test machine connected to a PWM inverter reveal the same spectrum as from standard PWM inverter fed machines. Thus there is reason to believe that noise comes from magnetostrictive deformation and not from magneto acoustic emission (MAE).

   ACOUSTIC NOISE RADIATED BY NOMINALLY IDENTICAL INDUCTION MACHINES FED FROM SINUSOIDAL AND NON-SINUSOIDAL POWER SUPPLIES
By Z. Q. Zhu; L. Xu; D. Howe [View]
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Abstract: The paper investigates the acoustic noise radiated from two nominally identical induction motors when fed from sinusoidal, quasi-square six-step, and asymmetric regular sampling subharmonic and space vector PWM converters. 1l1e theory for analysing the noise spectrum is developed further to account for the interaction between the motor and drive, and is used to identifY the dominant noise components. It is shown that manufacturing tolerances can result in significant differences in t11e noise level emitted from nominally identical motors, and that mechanical resonances can result in extremely high noise emissions such resonances can be induced by stator and rotor slot airgap field harmonics due to the fundamental component of current, and by the interaction between the airgap field harmonics produced by the fundamental and the PWM harmonic currents. Therefore, the PWM strategy will be critical only if the dominant cause of the fitted noise is the interaction of the fundamental airgap field and PWM harmonics.

   VIBRATIONS IN THE SWITCHED RELUCTANCE MOTOR - INFLUENCE OF THE FEEDING MODE
By M. Gabsi; F. Camus; B. Humeau; M. Besbes [View]
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Abstract: This paper studies the influence of the feeding mode upon the vibrations of the Switched Reluctance Motor ( SRM ). We present an extensive study of the relationship between current wave-form or the control mode ( PWM, hysteresis mode ) and vibrations. Theoretical and experimental results explain clearly the origin of vibration and the relationship between current and radial magnetic forces.

EPE 1997 â€“ 36: Dialogue Session DS5f-1: CONVERTER MACHINE INTERACTIONS: ACOUSTIC NOISE
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 â€“ 36: Dialogue Session DS5f-1: CONVERTER MACHINE INTERACTIONS: ACOUSTIC NOISE
	[return to parent folder]

	THE CONTRIBUTION TO NOISE IN AN INDUCTION MACHINE, FED FROM A PULSE WIDTH MODULATED INVERTER By Lars Laftman	[View] [Download]
Abstract: Pulse Width Modulated (PWM) inverter fed induction machines generate significant noise. There is a simple relation between the inverter harmonics and the machine noise, and with this, it is easy to design quieter inverter drives. The noise comes not only from radial airgap forces but also from magnetostriction. A FEM model has been derived for calculation of magnetostrictive deformation of the stator. The FEM model has been verified on a test machine in which the radial airgap forces have been eliminated. It turns out that magnetostrictive and radial airgap forces have about the same magnitudes. Measurements with the test machine connected to a PWM inverter reveal the same spectrum as from standard PWM inverter fed machines. Thus there is reason to believe that noise comes from magnetostrictive deformation and not from magneto acoustic emission (MAE).

	ACOUSTIC NOISE RADIATED BY NOMINALLY IDENTICAL INDUCTION MACHINES FED FROM SINUSOIDAL AND NON-SINUSOIDAL POWER SUPPLIES By Z. Q. Zhu; L. Xu; D. Howe	[View] [Download]
Abstract: The paper investigates the acoustic noise radiated from two nominally identical induction motors when fed from sinusoidal, quasi-square six-step, and asymmetric regular sampling subharmonic and space vector PWM converters. 1l1e theory for analysing the noise spectrum is developed further to account for the interaction between the motor and drive, and is used to identifY the dominant noise components. It is shown that manufacturing tolerances can result in significant differences in t11e noise level emitted from nominally identical motors, and that mechanical resonances can result in extremely high noise emissions such resonances can be induced by stator and rotor slot airgap field harmonics due to the fundamental component of current, and by the interaction between the airgap field harmonics produced by the fundamental and the PWM harmonic currents. Therefore, the PWM strategy will be critical only if the dominant cause of the fitted noise is the interaction of the fundamental airgap field and PWM harmonics.

	VIBRATIONS IN THE SWITCHED RELUCTANCE MOTOR - INFLUENCE OF THE FEEDING MODE By M. Gabsi; F. Camus; B. Humeau; M. Besbes	[View] [Download]
Abstract: This paper studies the influence of the feeding mode upon the vibrations of the Switched Reluctance Motor ( SRM ). We present an extensive study of the relationship between current wave-form or the control mode ( PWM, hysteresis mode ) and vibrations. Theoretical and experimental results explain clearly the origin of vibration and the relationship between current and radial magnetic forces.