SLLSFH8A August 2021 – December 2021 MCT8316A
In 120° commutation scheme, each motor phase is driven for 120° and Hi-Z for 60° within each half electrical cycle, resulting in six different commutation states for a motor. Figure 9-3 shows the phase current and current waveform FFT in 120° commutation mode. In variable commutation scheme, MCT8316A device switches dynamically between 120° and 150° trapezoidal commutation depending on motor speed. The device operates in 150° mode at lower speeds and moves to 120° mode at higher speeds. Figure 9-4 shows the phase current and current waveform FFT in 150° commutation.