#Automatic car starter install#
#Automatic car starter full#

#Automatic car starter install#

The above explanation shows that why we need a starter to install with a motor? How a Motor Starter Works?Ī starter is a control device that is used for switching the motor either manually or automatically. They also provide protection against fault conditions such as low voltage & overcurrent during normal operation.Īlthough small motors rated below 1 horsepower have high impedance and they can withstand the initial current thus they do not need such motor starter, however, they do need overcurrent protection system which is provided by the DOL (Direct On-Line) starters. In order to protect the motor from such a huge amount of currents, we use a starter that limits the initial current for a short duration at startup & once the motor attains a certain speed, the normal power supply to the motor is resumed. So such amount of current can damage or burn the windings of the motor that will render the machine useless & it can cause a huge dip in voltage of the supply line that can damage other appliances connected to the same line.

#Automatic car starter full#

The high inrush current is 5-8 times the normal rated full load current. As the rotor speed increases the slip of the motor decreases & the current drawn by the motor is reduced. This EMF produces an electrical current in rotor winding that creates a magnetic field to generate torque in the rotor. The high inrush current magnetizes the air gap between the rotor & stator that induces an EMF in the rotor winding. 1 at standstill (rest position), thus the impedance is at its minimum & it draws a huge amount of current called inrush current. The slip of the induction motor is at maximum i.e. The impedance varies inversely with the slip. The rotor impedance depends on the slip of the induction motor which is the relative speed between the rotor & stator. It is because of its low rotor impedance. It senses the current & breaks the power supply.Ī motor starter is essential for starting an induction motor. Huge current through the rotor may damage the winding as well as other appliances connected to the supply. Overload protection circuit: The purpose of this circuit is to protect the motor from potential harm due to the overload condition.

Electrical Contactor: The purpose of the contactor is to switch ON/OFF the power supply to the motor by making or breaking the contact terminals.

To protect the motor from low voltage & overcurrent.Ī motor starter is made of two main components that work together to control & protect the motor.

Similar to a relay, the motor starter switches the power ON/OFF & unlike a relay, it also provides a low voltage & overcurrent protection.

Rotor Resistance or Slip Ring Motor StarterĪ motor starter is an electrical device that is used to start & stop a motor safely.

Full Voltage or Across The Line Starter.

Types of Motor Starters Based on Starting Methods & Techniques.