What is Direct Online (DOL) starting of an induction motor?
1 Answer
Direct Online (DOL) starting is a method used to start induction motors, which are commonly used in various industrial and commercial applications. In this starting method, the motor is directly connected to the power supply without using any additional starting devices or control circuitry. As a result, the motor experiences the full voltage of the power supply from the moment it starts.
Here's how the Direct Online (DOL) starting method works:
Starting Switch: The motor is initially at rest, and the DOL starting process is initiated by closing a switch that connects the motor to the power supply.
Full Voltage: When the switch is closed, the motor is directly connected to the full voltage of the power supply. This results in a sudden and high inrush current as the motor coils and windings try to overcome their initial inertia and start rotating.
Starting Torque: The high inrush current produces a relatively high starting torque, which helps the motor overcome static friction and start moving. This torque is usually sufficient for motors driving loads with low initial resistance, such as fans, blowers, and conveyor belts.
Voltage Drop: Due to the
Here's how the Direct Online (DOL) starting method works:
Starting Switch: The motor is initially at rest, and the DOL starting process is initiated by closing a switch that connects the motor to the power supply.
Full Voltage: When the switch is closed, the motor is directly connected to the full voltage of the power supply. This results in a sudden and high inrush current as the motor coils and windings try to overcome their initial inertia and start rotating.
Starting Torque: The high inrush current produces a relatively high starting torque, which helps the motor overcome static friction and start moving. This torque is usually sufficient for motors driving loads with low initial resistance, such as fans, blowers, and conveyor belts.
Voltage Drop: Due to the