Title : Three Point 3 Point Starter Diagram
Link : Three Point 3 Point Starter Diagram
Three Point 3 Point Starter Diagram
The dc motor based 3 point starter mainly includes three terminals namely l a and f. Well it s due to the presence of back emf e b which plays a critical role in governing the operation of the motor.
4 Point Starter Four Point Starter Difference Between 3 Point
3 point starter 3 point starter is a device whose main function is starting and maintaining the speed of the dc shunt motor.
Three point 3 point starter diagram. Working principle of 4 point starter. 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. The starter consist of starting resistance divided into several sections and connected in series with the armature.
A 3 point starter in simple words is a device that helps in the starting and running of a shunt wound dc motor or compound wound dc motor now the question is why these types of dc motors require the assistance of the starter in the first case. 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. A three point starter is a device that helps in starting and running the shunt wound motor or compound wound dc motor.
The starter consists of starting resistance divided into several sections and connected in series with the armature the tapping points of the starting resistance are brought out to a number of studs. The figure shows the schematic diagram of a three point starter for a shunt motor with protective devices it is so called because it has three terminals l z and a. Now the question is why these types of dc motors require the assistance of the starter in the first place.
It is so called because it has three terminals l f and a. The circuit diagram of a four point starter is shown below and its arrangement can form three parallel circuits. 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.
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 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. 3 point starter device construction of 3 point starter.
The complete circuit connection for a three point starter with nvr and over load realsease olr is shown in figger. 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 back emf eb plays a crucial role in governing the operation of motors.
Mainly there are three main points or terminals in 3 point. The back emf eb is developed as motor armature starts to rotate in presence of magnetic field so initially back emf eb is zero. Use of a brass arc as shown in the figure enables connection of the field circuit directly eith the supply instead of via the starter.
It is to be noted that points l a and f are the three terminals of a three point starter. The only explanation to that is given by the presence of back emf e b which plays a critical role in governing the operation of the motor. The tapping points of the.
Three point starter figure shows the schematic diagram of a three point starter for a shunt motor.
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Thus this article Three Point 3 Point Starter Diagram
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