This type of starter drives the motor at a slightly pre-selected speed to complete its applications. To change the speed of an ac motor it is necessary to vary the frequency of the given power supply or to vary the number of poles of the motor (by reconnecting the windings in some). Such a starter is used where the motor needs to be driven in both directions and is used for contact. Such a starter consists of two mechanically connected magnetic contacts with alternating phases in the forward and opposite directions.
TOE STARTER 3 KLYUCH FULL
Full Voltage Reversing Starter:ģ phase induction We can change the direction of the motor by switching any 2 phases. Such a starter is used in places where the motor rating is low and needs to be driven in one direction. So that large voltage drops are not made in those power lines. The power rating of the motor connected to such a starter is low. In such a starter the motor is given direct power from the electric line. Full Voltage or Across The Line Starter.Before we talk about the type of motor, we will look at some of the techniques used in motor starters. Various starting techniques are used to turn on the induction motor in the industry. Thus a spring is used between the contacts of the contactor so that the contactor returns to its original position and the motor stops working.Īlso Read: Star Delta Starter Working Principle | Types Of Star Delta Starter | Star Delta Starter Theory Types of Motor Starters Based on Different Techniques And Starting Methods: The contactor is de-energized using stop buttons. The starter uses pushbuttons called start and stops which cause the motor to start and stop. When this is powered, the power passes through the contactor coil and forms an electromagnetic field, which pulls or pushes the contacts to connect the motor windings to the power supply. This is why other alternative motor starters with protection such as automatic starters are used instead.Īutomatic starters use electrochemical relays and contactors, which are used to switch the motor on/off operation. Due to this situation, this starter is not used much. Occasionally such a position can also be caused by the motor winding force due to the high current being carried in the motor. The amount of starting current is 5 to 6 times higher than the full load. In the time between the application of the electric supply to the motor and the actual acceleration of the motor at its full speed, a large amount of current is drawn from the supply through the stator.
When current is given to the induction motor, the current of the magnetic field moving in the rotor winding and the AMF behind the current produced increases the motor torque, which leads to a higher rotor current. Due to which the stator and rotor of the motor are not damaged in any way.Īlso Read: What is a 4 Point Starter | Working Principle of 4 Point Starter | Diagram & Its Applications Why We Need a Starter with a Motor? It works to isolate the main current from experiencing even the slightest overheating of the motor. Overload Protection Circuit: This can be identified by its name and what its function is. The motor starter consists of two main components which are used to protect and control the motor.Įlectrical Contactor: The main function of a contactor is to turn on/off the power supply in the motor by making or breaking contact terminals. Provide protection against motor overvoltage and Undervoltage.The need for the motor to change the direction of time.The following are the main functions of a motor starter. Its function is very similar to that of a relay that turns the motor on and off and Provides protection to the motor against over voltage and under voltage from the relay. Disadvantages of Variable Frequency Drive:Ī motor starter is an electric device by which we can turn any motor on or off.Advantages of Variable Frequency Drive:.Disadvantages of Autotransformer Starter:.Disadvantages of Rotor Resistance Motor Starter:.Advantages of Rotor Resistance Motor Starter:.Rotor Resistance or Slip Ring Motor Starter: Disadvantages of Stator Resistance Motor Starter.Advantages of Stator Resistance Motor Starter:.Types of Motor Starters Based on Different Techniques And Starting Methods:.
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