Axial-flow fans are driven by electric motors; indeed, like any piece of machinery, they require a "prime mover" to operate. When selecting a motor for an axial-flow fan, the goal is for the motor to drive the impeller quickly to its rated speed for normal operation. The motor starting process encompasses both the initial energization and the subsequent acceleration phase. Starting methods are categorized into full-voltage starting and reduced-voltage starting.
Selecting an appropriate starting method requires a detailed analysis of factors such as power grid capacity, the starting torque requirements of the mechanical load, and the motor's own characteristics, all to ensure the specified starting time is achieved. For instance, if the power grid capacity is large-meaning the motor's starting current will not cause a significant voltage drop-and the grid's control circuits and equipment can handle the high starting current for a short duration, then full-voltage starting is suitable. Conversely, if the fan's starting torque requirement is low and the grid capacity is relatively small compared to the motor, the priority shifts to minimizing starting curre