BLDC Acoustic Tuning for Medical Devices

Noise usually starts in the control loop

The acoustic story is shaped by commutation strategy, current ripple, and mechanical resonance together. Moving only one variable seldom fixes the symptom.

For regulated device programs, we log the acoustic state in the same worksheet as thermal rise and speed regulation so validation teams can compare revisions directly.

• Tune low-speed commutation before chasing enclosure damping.
• Log idle-state noise and loaded-state noise separately.
• Keep the PSU ripple review inside the same validation pack.

Acoustic validation pack

Drive-side logging example

{
  "mode": "low-speed-creep",
  "busVoltage": 48,
  "phaseCurrentA": 1.9,
  "noiseDbA": 37.4,
  "velocityRipplePct": 1.8
}