3 Point Starter | Diagram and Working Principle


What is 3 point starter in DC motor?

A three-point starter is an electrical device, used for starting as well as maintaining the DC shunt motor speed. The connection of resistance in this circuit is in series which decreases the initial high current and guards the equipment against any electrical failures.

3 Point Starter Diagram


Working Principle of 3 Point Starter

It can also be called a three-point starter. Its structure is shown in Figure. To start the motor, the handle is moved from off position to the first contact position. The total obstacle is in the armature circuit, the field connection is connected directly to the supply through a volt coil. Comes in as soon as the speed of the motor increases in the same way as the archete back emf emits and decreases in the value of current Now the handle is moved to the second step. Again this type of function will be done eventually at the last step of the handle. This time the armature will connect directly to the supply and this time the handle does not come with a no-volt coil. The magnet will hold the handle in the Walt coil, and the motor will not need to hold the handle to continue and the motor will rotate at full speed.

Mechanism of 3 points Starter is done so that if the magnetism of the nvc coil is exhausted for any reason, and the handle will be re-off position through the spring, then the supply will not be supplied directly to the motor, with the handle again All the process has to be done, the overloaded relay in the starter is also fitted. It also protects from overload. In the mechanism of which the motor is overloaded.

There is a 3-point Starter equipped with such safety systems


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