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AVR194
Figure 5. Commutation steps and rotating field
Hall_H3H2H1
011
coil U
coil W
001
010
coil U
coil W
101
110
coil V
coil V
coil W
coil V
coil U
coil W
coil V
100
Step1
Step3
Step5
coil V
coil U
coil W
coil V
coil U
coil W
coil V
Step2
Step4
Step6
Commutation creates a rotating field. Step1 Phase U is connected to the positive DC bus volt-
age by Q1 and Phase V is connected to ground by Q4, Phase W is unpowered. Two flux vectors
are generated by phase U (red arrow) and phase V (blue arrow). The sum of the two vectors
give the stator flux vector (green arrow). Then the rotor tries to follow the stator flux. As soon as
the rotor reaches a given position, the hall sensors state changes its value from “010” to “011” a
new voltage pattern is selected and applied to the BLDC motor. Then Phase V is unpowered
and Phase W is connected to the ground, resulting in a new stator flux vector ‘Step2’.
By following the commutation schematic Figure 3 and Table 1, we obtain six differents stator flux
vectors corresponding to the six commutation steps. The six steps provide one rotor revolution.
5
8138A–AVR–04/08
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