1.The starting torque must be large enough so that the winding machine can overcome the resistance torque and start.
2. Start the current as small as possible.
3, start the equipment should be as simple as possible, economic, easy to operate.
The start method of winding machine can be divided into two kinds: direct start and step-down start. Direct start is the winding machine directly connected to the rated voltage start, also called full voltage start. This starting method is mainly used when the power grid capacity is large and the starting current of the winding machine will not cause obvious voltage drop on the power grid. Generally, the winding machine with power below 1Okw is started by full voltage. When the power is large and the power supply capacity is not allowed, the voltage reduction startup should be used. The step-down starting method can be divided into Y-A starting method, compensator step-down starting method and yanbian triangle step-down starting method. The specific method shall be determined according to the nameplate of the motor and the load carried by the motor.
