Sensorless BLDC motor control and BEMF sampling …
Ec. 4/35 AN1946 The step sequence and corresponding motor phase current are shown in Figure 3 and Figure 4 below. Figure 3. Six-Step current circulation ... configuration of a motor when PWM is in an OFF state allowing BEMF to be measured during the non-energized phase. Figure 6. BEMF sampling at end of PWM OFF
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