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Summary Three‐phase voltage source inverters (VSIs) provide high‐order harmonic voltages. The feed of a power induction machine by a VSI increases the acoustic noise, which becomes unacceptable especially for applications requiring a moderate level such as electrical traction. It has been found that the noise level depends on the total harmonic distortion of the VSI. Thus, the level of harmonics depends on the pulse width modulation (PWM) techniques used to control the VSI. Several PWM techniques have been developed in the literature, such as space vector PWM, selective harmonic elimination PWM, and random PWM. This paper presents a study of the PWM impact on the acoustic noise generated by a two‐level inverter‐fed induction machine. The acoustic noise and harmonic spectrum are carried out corresponding the three PWM techniques at a couple of machine operation conditions. The experimental results show that the acoustic noise is significantly reduced with the random PWM strategy. A comparative study is presented and discussed in this paper.

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