Electric Motor Noise

There are numerous applications of electric motors and the type of noise produced by each may be very specific to the installation and type of motor. There are a number of reasons why the motor is perceived as being noisy:

  • The loudness level of the sound
  • Periodic variation of sound pitch due to motor speed variation
  • Non-periodic variation of sound pitch due to motor speed variation
  • Squeaks/scrapes generated by the moving component
  • High frequency motor whine

The primary excitation sources are:

  • Direct radiated sound from the motor
  • Sound generated from internal components such as gear trains, cables, etc.
  • Structure-borne noise generated through the component mounting system or the component housing
  • Sound generated by interference between the moving component and surrounding components/structures

A number of other factors may influence the generation of sound:

  • Load variation on the motor
  • Acoustic isolation of motor
  • Internal design of component geartrains, cables, etc. to minimize load variation
  • Clearance and tolerance of component and surrounding structures
  • Component/motor mounting
  • Motor Speed

See also: Electric Motors.

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Subjects: Electrical Engineering Electronics Noise & Vibration