You must have noticed that we use a starter to run motors. But have you ever thought why starter is used for running a motor?? Lets dig in to the cause. As we know, the current drawn by a motor armature is given by the relation: Ia=(V-Eb)/Ra In this equation, Eb […]
starter
Three Point Starter
The internal wiring for Three point starter is shown in the fig below. The three terminals of the starter are marked A, F and L. One line is directly connected to point L which is further connected to the starting handle (arm) through the overload release. If motor has to be started, we need to […]
Four Point Starter
Four point starter is connected to a long-shunt compound motor. If we compare it to the generally used 3 point starter, we can easily mark one remarkable difference than its counterpart. In four point starter, the most critical ‘Hold ON coil’ (electromagnet) is placed out of the shunt field circuit. Rather to its place in […]
Series Motor Starter
A face plate/drum type controller is used for starting the series motor. This controller can also be used to control the speed of a series motor as well as to reverse the direction of its rotation. It is commonly known as Series motor starter. As the operator has to monitor the operation of motor continuously, […]
Direct online starter
The most simple and basic type of starter for motors (induction motor) is the Direct Online starter. The Direct on line starter contains an ON/OFF switch and an OLR. Here, OLR stands for overload relay for protection against excessive load current. The selection of switch depends upon the operator’s requirement. Generally, the switch which is […]
Auto Transformer Starter
An Auto transformer starter basically uses an auto-transformer to reduce the voltage applied to a motor during its start. As we know that the starting of big motors which are used for prolonged periods exert large current in the circuit. Due to this, a voltage drop occurs which may damage other electrical equipments which are […]
Star Delta Starter
Star Delta starter comes under the category of starters using reduced voltage method for starting the motor. Just like all other starters, the basic aim to use this starter is to decrease initial high starting current generated by the motor at the starting procedure. It is used for the purpose of limiting the voltage drop […]