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The brushless motor is a synchronous motor, which means that the rotation of the shaft is synchronized with the frequency of the supply current; the rotation period is exactly equal to an integral number of AC cycles.
It is not possible to start the motor using a sine-wave drive, because the stopped rotor does not follow the frequency when starting.
Therefore, when starting the motor, the acceleration operation is required by feeding back the rotor position.
In steady operation, the speed can be maintained against load fluctuations by feeding back the target speed deviation.
*Synchronous motor may be able to start if there is no load.