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THE CONTRIBUTION TO NOISE IN AN INDUCTION MACHINE, FED FROM A PULSE WIDTH MODULATED INVERTER
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| Author(s) |
Lars Laftman |
| 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). |
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| Filesize: | 573.9 KB |
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| Type |
Members Only |
| Date |
Last modified 2015-12-08 by System |
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