SLLA567 August   2021 MCF8316A , MCT8316A

 

  1.   Trademarks
  2. 1Introduction
  3. 2Concept
    1. 2.1 Optimizing acoustics with sensorless field-oriented control motor driver (MCF8316A)
      1. 2.1.1 PWM Modulation Schemes
      2. 2.1.2 Dead time compensation
      3. 2.1.3 Comparing audible noise before and after optimizing acoustics with MCF8316A
    2. 2.2 Optimizing acoustics with sensorless trapezoidal control motor driver (MCT8316A)
      1. 2.2.1 120° Trapezoidal commutation Scheme
      2. 2.2.2 Variable commutation Scheme
      3. 2.2.3 Comparing audible noise between 120° commutation and Variable commutation with MCT8316A
    3. 2.3 Comparing acoustic performance between Sensorless FOC motor driver (MCF8316A) and 180° sinusoidal motor driver (DRV10987)
  4. 3Summary
  5. 4References

1 Introduction

Acoustics is audible noise contributed by motor commutation and harmonic frequencies in motor drives applications. Any distortion in motor phase current can translate to audible noise. Stator excitation in motor can generate mechanical resonance at audible frequency ranges leading to audible noise. Acoustics due to motor commutation is clearly heard in motors running at lower speeds. At higher motor speeds, air or liquid flow noise masks the commutation noise. Improving acoustic performance is important for home applications such as washer, dryer, air purifier, vacuum cleaners and laptop fans. Audible noise can be minimized by blocking the noise, shaping the noise or avoiding the noise through control techniques. With MCF8316A and MCT8316A devices, system designers can minimize the audible noise through control techniques such as continuous PWM modulation, dead time compensation and variable commutation mode.