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Evaluation of a winding machine performance is good or bad, in addition to operating characteristics (such as torque, efficiency, power factor, etc.), the startup characteristics of the winding machine is also an important indicator. Reliability Winder run depends to a large extent, start-up performance is good or bad.

① starting torque must be large enough to overcome the resistance of the winding machine and start torque;

② starting current to be as small as possible;

③ boot device should be as simple, convenient and economical, to operate.

Winder start method can be divided into two kinds of direct start and buck starts. Winder direct start is directly connected to the rated voltage start, also called full pressure start.This method is mainly used in the larger starting power capacity, the starting current is not winding machine cause a significant voltage drop on the occasion of the power grid. The general power below 1Okw in winding machine adopts full voltage starting. Not allowed in larger power,power supply capacity, should use the step-down start.Method of step-down start can be divided into the Y-A start up method, compensator step-down start method and Yanbian triangle step-down start several method. What specific methods are adopted according to the motor nameplate and motor load circumstances.

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