Types of starters in induction motors

In this article we discuss the various starting methods for induction motors and the need for starters. First the starting principle is discussed along with the types of starting methods. Need of using starters for Induction motor.

Starter using additional resistance in rotor circuit, for Wound rotor (Slip-ring). NPTEL provides E-learning through online Web and Video courses various streams.

It works on the principle of rotating magnetic fiel i.

It is not recommended to use primary resistors type of starting method for motors with high starting torque requirements.

YPeS of Starter for 3-Ph InductIon motorS For slip-ring induction motors : Rotor rheostat starter For squirrel cage induction motors : D. StartIng of SlIP rIng InductIon motor In . So the reason of using the starter is clear here. We use starters in order to limit the high starting current. We use different starters for both the type of three phase induction motors. Let us consider first squirrel cage type of induction motor.

Types of Starters in Three Phase Induction Motor - MCQs with . The Auto transformer is used in both the type of the connections, i. The auto transformer is used to limit the starting current of the induction motor. The above three starters are used for cage rotor induction motor. Among all these types of motors, a few types of motors required to be operated with certain conditions.

A stator is needed for an induction motor (three phase type ) in order to limit the starting current. Motor Starters are types switches (either electromechanical or solid state) that are designed to start and stop the motors by providing the necessary power to the motor . Direct-on-line starters are the simplest type of starter. A DOL starter usually includes overcurrent protection and overload protection.

The overcurrent protection protects the starter circuitry from short circuits and usually. The heavy starting current may damage the motor windings. Starting of slip ring induction motor In case . Soft Starters are used on all types of AC and DC motors.

They are most commonly used with the AC squirrel . Starters limit the starting current in an induction motor which goes 5–times of full load current as slip remains 1. Different starting methods are employed for starting induction motors because Induction Motor draws more starting current during starting. Star-Delta starter always for higher power rating. To prevent damage to the windings due to the high starting current flow, we employ different types of starters. The simplest form of motor starter for the induction motor is .