3 Sources of Noise in a Stepper Motor

The amount of audible noise from a stepper motor depends on the type of motor and the operating conditions. Stepper motor noise has been described as a high-pitched whine, a hissing noise or even a deflating tire. Human audible frequency range is generally considered as 20 Hz to 20 kHz, but the human ear is most sensitive to frequencies between 2 kHz and 15 kHz. Permanent magnet and hybrid stepper motors are generally quieter, whereas variable reluctance stepper motors are the noisiest.

The sources of noise coming out of a stepper motor can be broken into three main categories: magnetic, mechanical, and electrical.