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Soft Starters- Advantages, Types and Applications
Monday, March 5, 2018

Motors that are used to run industrial applications employing pumps, conveyors, compressors and blowers all have one thing in common. A large current is drawn by them at the start up that’s almost six times more than what they draw under normal operation.

The high current can stress the components of a motor and create power issues on electrical systems. That’s why for motors that draw large current, soft starters are used.

With a soft starter, the motor current rises gradually until it reaches a steady level. This not only reduces the start-up current, but also reduces the motor torque during start-up. Motor voltage is adjusted by soft starters through back-to-back triacs or thyristors in AC line of the motor.
Some of the benefits of using soft starters with motors are:

1. Smooth Start

Soft starters control the initial torque of the motor. The torque is gradually increased to prevent jerks in the motor and this extends the life of components.

2. Protecting Electrical Components

Soft starters reduce the starting current of a motor and prevent it from accelerating at a high speed in the start. This prevents thermal, electrical and mechanical weakening of motor components.

3. Soft-Stop Function

Some special soft starters come with a soft-stop function particularly for use in applications where a sudden stop can create problems. For example, in a conveyor belt, if the process is stopped suddenly, it could damage the equipment and products on the belt.

4. Reducing the rising temperature

When the motor draws high current at the start, the temperature rise and this can damage the internal components of a motor. Soft starter prevents the temperature from rising in the motor and protects the internal components.

5. Savings

With soft starters, the internal components of the motor remain safe from damage which means that expensive motors will last long and you won’t have to pay extra for repairing them occasionally.

Types of Soft Starters

There are three types of soft starter namely one phase controller, two phase controller and three phase controller.

1. One Phase
In this type of soft starters, torque is controlled at one phase of the motor. The force of the shock is reduced, but the starting current value remains the same.

2. Two Phase
In two phase soft starters, two phases of motor are controlled and the starting current is also reduced.

3. Three Phase
In this type of soft starters, all three phases are controlled. These soft starters are more efficient and allow more control over the motor. Heavy duty applications always use three phase soft starters.

Applications of Soft Starters

Soft starters are used in:
  • Power sector
  • Machine tools
  • Textile industries
  • Plastic
  • Rubber
  • Cement industries
  • Steel industries
  • Paper and pulp
  • Sugar plants
Where to Buy Soft Starters

If you’re searching for high quality soft starters, check out our wide range of soft starters at Midwest Equipment. For more information, call us at 1 (888) 261-3076.


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