Direct online or DOL starting of asynchronous or induction motor.

Direct-on-line starting DOL is a starting method of induction motor where motor is directly connected to the supply. So the full voltage and constant frequency is available at starting. It is the most economical and simple starting method of squirrel cage induction motor. DOL or direct online starting method is mostly used in small power motor.

Direct online starting is cheap, accelerate time is reduced with high starting torque.

[alvaa]Other than the advantages DOL- direct online starting has problems with high inrush current reaching value to 10 to 12 times of the rated current. This high inrush current might cause insulation damage to motor. Also the electrical connection joint will be affected by electro-dynamical stress causing to reduce the mechanical life.

DOL or Direct online starting
DOL or Direct online starting

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