Axial fan operation is driven by electric motors, in fact, any equipment is the same, to run it must have a similar "engine." When selecting the motor of axial fan, it is hoped that the motor can drive the impeller to reach the rated speed and work normally. The starting of the motor includes the whole process of starting and accelerating. Its starting mode is divided into full pressure start and decompression start.
Axial flow fan needs to choose the starting method of motor reasonably. It must be analyzed according to the capacity of power supply network, the requirement of mechanical load on starting torque, the characteristics of motor itself, and so on. In order to obtain the prescribed starting time. For example, the capacity of the grid is very large, and the starting current of the motor does not cause a significant voltage drop on the grid. In addition, the control lines and equipment of the power network allow short-term transmission through a large enough starting current for a short time, and the full-voltage start-up can be adopted.
If the torque required by the fan during start-up is small and the grid capacity is not very large relative to the motor, the main consideration is how to reduce the starting current and adopt the reduced-pressure start-up. According to the calculated number of specific revolutions, the model of the fan is selected and its corresponding point is judged whether it is in the high efficiency zone, if it is in the high efficiency area, the machine number of the fan is preliminarily calculated according to the corresponding flow coefficient or pressure coefficient.www.jnblower.com