SLLA567 August 2021 MCF8316A , MCT8316A
In below experiment, acoustics performance is measured in dBA using a handheld sound level meter. Figure 2-6 shows the noise level comparison at different motor electrical speeds for an air-purifier motor. Audible noise is reduced by 3.3 dBA at 33 Hz motor electrical frequency with dead time compensation and continuous PWM modulation schemes.