Here’s An Insight into Motor Starters and Motor Starting Methods

An industry comprises multiple electrical components that come together to ensure that all products are manufactured and furnished in an accurate and efficient way. Generally, every industry has multiple tools, devices, and equipment operated by a team of operators and administrators; however, amongst all the electrical instruments, motor starters are perhaps the most integral component of any industrial process.

We understand that for a layperson, who has little or no backdrop in the electrical field, it is extremely tough to comprehend how a specific piece of machinery functions. However, since every electrical appliance has a complex web of wiring and operation, in this article, we have attempted to simplify the role of a motor starter and various motor starting methods used across industries.

So, what are motor starters? In simple terms, a motor starter refers to an electrical device responsible for starting and stopping a motor in the safest way possible. In some ways, a motor starter is similar to how an electric relay functions, i.e., it instantaneously switches the power on or off, but unlike a relay; it also provides the machine with added benefits like overcurrent protection and low voltage. Below we have stated three primary functions of a motor starter:

  • To accurately reverse the current direction of the motor
  • To effectively start and stop a motor.
  • To safeguard the motor from overcurrent and sudden low voltage fluctuations.

Next, let us delve into why we need a motor starter? As the name suggests, a motor starter is vital for kickstarting an induction motor. First, it is important to remember that the low rotor impedance mostly depends on the induction motor slip, also known as the relative speed between the stator and rotor. However, the impedance inversely varies with the motor slip.

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Glimpse Into Various Motor Starters Based on Techniques and Starting


In most cases, industry owners are responsible for supervising and taking ownership of all the integral decisions of the industry. Hence, they have to carefully choose which motor starter will sit well with the needs of their industry. Below we have given short introductions of some of the many motor starting techniques deployed across industries.

  1. Across the liner starter or full voltage

The liner starters efficiently connects the motor with the power line, leading to the delivery of full voltage. In addition, all the motors connected to full voltage starters have low power ratings to prevent high voltage drops in the power lines.

  1. Reversing starters

It is possible to reverse the direction of a three-phase motor induction by exchanging the position of two phases. This starter can incorporate two magnetic contactors with interchanged phases for reverse and forward direction. Reverse starters are used in applications where the motor is required to operate in two directions, and usually, contractors are used to regulate it.

  1. Reduced Voltage Starter

One of the most common motor starting methods is to decrease the voltage levels in the beginning in order to reduce the sudden current flow that can hamper motor windings and lead to sharp dips in the voltage levels. Generally, these starters are used for operating high-rated motors.

There are various types of motor starters available in the market, such as soft starters, autotransformer starters, slip ring motor starters, direct online starters, stator resistance starters, and more. To learn more about motor starters and motor starting techniques, we recommend you join hands with a renowned service provider in the electrical field. They will ensure that the motor starter is installed accurately, without damaging any other part of the electrical equipment.

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