Title : 3 Point Starter Diagram
Link : 3 Point Starter Diagram
3 Point Starter Diagram
3 point starter device construction of 3 point starter. The 4 point starter has a lot of constructional and functional similarity to a 3 point starter but this special device has an additional point and coil in its construction as the name suggests.
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Working principle of 4 point starter.
3 point starter diagram. Here l line terminal is connected to the positive supply a armature terminal is connected to the windings of an armature terminal and f field terminal is connected to the winding of field terminal. Hence named 3 point starter. A 4 point starter protects the armature of a dc shunt motor or compound wound dc motor against the initially high starting current of the dc motor.
A three point starter is a device that helps in starting and running the shunt wound motor or compound wound dc motor. Well it s due to the presence of back emf e b which plays a critical role in governing the operation of the motor. The back emf eb plays a crucial role in governing the operation of motors.
It contains 3 terminals namely l z a. The 3 point starter connects the resistance in series with the circuit which reduces the high starting current and hence protects the machines from damage. The circuit diagram of a four point starter is shown below and its arrangement can form three parallel circuits.
The figure above shows that typical representation diagram of a 3 point starter for dc shunt motors with its protective devices. In addition to 3 point starter there is an extra operational point which is denoted with the letter n and it is connected to the nvc no voltage coil four point starter circuit diagram. The dc motor based 3 point starter mainly includes three terminals namely l a and f.
3 point starter 3 point starter is a device whose main function is starting and maintaining the speed of the dc shunt motor. The starter is made up of of starting resistances divided into many section and which are connected in series within the armature. Now the question is why these types of dc motors require the assistance of the starter in the first place.
The back emf eb is developed as motor armature starts to rotate in presence of magnetic field so initially back emf eb is zero. A 3 point starter is a device that helps in the starting and running of a dc shunt motor or compound wound dc motor similar to a 4 point starter.
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