Science and Technology

Motor Starters and Their Variations to Choose From

A motor starter is a device which is connected in series with the motor for decreasing the starting current it receives, and then subsequently increasing the current when the motor starts to rotate gradually. The starter has a connector, which is a switch through which the control of the current flow of current through the motor is achieved. The starter also has the overload unit that can measure the current flow through the motor, and also control motor halting when large and unnecessary current is being drawn.


Because all motors will experience a surge in current temporarily when they start, all the new models come with overload protection, which is provided by the motor starters. Motor starters can therefore start, stop, and even reverse the current. They are used in manufacturing facilities, mining equipment, water treatment plants, and in industrial, commercial, and agricultural settings.


Types of Motor Starters


The current which is drawn by a motor is controlled by reducing the back EMF, by reducing the supply voltage. Control can also be achieved by increasing the resistance of the rotor at the time the motor starts. This is the main principle of a motor starter. Based on their functioning, motor starters can be classified as follows:


Direct On-Line- The controller here is a simple push-button and by pressing it, the motor will get the supply current. If overcurrent is there, the stop button can be pressed through which the bypass auxiliary contact gets opened.

Star Delta- In the star delta connection, the current that is drawn is 0.58% of the total current.

Autotransformer Starter- The autotransformer of this starter makes a part of the star connection. 

Star Resistance Starter- The starter has three resistors combined in a series. A voltage drop across each of these resistors caused a drop in voltage.

Rotor Resistance Starter- The 3 resistances of this starter can reduce the current of the rotor, but the torque does increase.


Choosing a Motor Starter


When you want to suffer the least from downtimes and have good quality and reliability in your processes, you should choose good quality motor starters as well. You can choose the DC motor starters, AC motor starters, pump starters, solid-state starters, and reversing starters among others, depending on the application.


NEMA Starters- Rating of the NEMA starter is based on the voltage and horsepower of the application. The starters have the reverse capacity and are bigger than the IEC starters. The starters provide for easy maintenance.


IEC Starters- This starter is also based on the application and provides for better performance. The size of an IEC starter may be based on the duty cycle, motor load, and other unique application-specific details. This starter can increase the longevity and lifespan of your motors and they have a long life.


Solid State Starters- The new form of motor starter relies on electrical components and not on mechanical components. They are nowadays replacing industrial motor starters.

Pump Starters- These starters are specially designed for the pump motors and are used in sewage handling processes, wastewater plants, and other similar areas. The starters usually handle a load of up to 600 VAC.


Enclosed Starters- If you are a motor starter to be placed in high-temperature conditions, the enclosed motor starters is a good option. These starters cannot be installed in a control panel but take floor-standing and wall-mounted forms. They can also be installed within the machine. The starter handles voltage in between 230V and 690V.


Choosing a leading supplier will help you get the best motor starter for your industry operational processes.

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