How to reduce noise for brushed motors?

How to reduce noise for brushed motors?

When developing products, especially in equipment applications that require sound, noise reduction with brushed motors is often the most daunting challenge faced by design engineers.

The inherent noise problem of brushed motors is the electric brush. Due to friction with the commutator and arcing caused by the current conducted through the brush and commutator, the brush generates mechanical and electrical noise. A noise reduction level of 10 decibels is a remarkable achievement. The decibel scale is logarithmic, not linear. For every 3 dB decrease in sound level, the sound intensity will decrease by half. Therefore, Tengchi generally recommends that equipment manufacturers check the following factors at the motor angle to achieve the effect of reducing noise: researching different polishing processes, inquiring about customized carbon brushes, and tightening machining tolerances.

From Topband  perspective, motor design is only one part of the challenge for noise reduction design engineers in the field of noise reduction projects. Radiation noise can be amplified by other components in the system.

Therefore, Topband has summarized the following other techniques for reducing noise: first, avoid using metal plates and structural components that resonate with the motor; Secondly, in some cases, using vibration isolators to install motors can be helpful; Thirdly, align the driven components accurately with the motor.

Do you have any ideas about noise reduction for brushed motors or even other motors? Welcome to leave a message and communicate with everyone.