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What are the ways and characteristics of motor starting？
（1）D-Direct On Line，
Advantages: less starting equipment, simple starting mode, low cost,
Disadvantages: the starting current is large, affecting the service life of the motor and unfavora to the stable operation of the power grid 。
（2）YD-Star-Delta，
Advantages: small starting current and small starting torque，
Disadvantages: can only be used for delta connected motors。
（3）VFD，
Advantages: small starting current, wide application range and simple operation，
Disadvantages: high cost, complex internal structure