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Position-sensorless BLDC motor gets a rapid development in recent years, but its start has been the focus and difficulties of the study. Whether the motor can get a normal start depends on the quality of the strategy of start. In this paper, there are analysis and comparison of a variety of methods of start brought forth by many scholars at home and abroad, and it also points out the quality of each method. Analysis shows that the starting method based on the voltage interpolation is preferable, which greatly increases the stability and successful rate of starting.