As a matter of fact, it is rather difficult for people to analyze the operation characteristics of three-phase brushless motor accurately. Motor air gap flux density distribution along with the air gap by sinusoidal. When the winding is energized, magnetic flux generated by the current impact of the air gap is negligible. In the condition of the switch operation, the power transistor is constant pressure drop. Each winding is symmetry and the corresponding circuit is completely consistent. The relevant electric time constant can be neglected. The power of sensored brushless motor and others that control circuit are also negligible. Three-phase brushless DC motors are also synchronous motors. It is very important to protect the three-phase brushless dc motor drivers.
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