What is the function and principle of soft starter

A soft starter is an electrical device used to start a motor. Its main function is to reduce the current impact when the motor starts, protect the motor and the power grid, and extend the service life of the motor. This article will introduce the function, principle and application of the soft starter in detail.

1. The function of soft starter

1. Reduce starting current surge

When the motor starts, due to the inertia of the rotor, a large starting current is required to overcome the resistance of the rotor. The soft starter controls the starting current of the motor and increases it gradually during the starting process, thereby avoiding the impact of the starting current and reducing the impact on the motor and the power grid.

1. Protecting the motor

During the starting process of the motor, the current shock may cause damage to the motor's windings, bearings and other components. The soft starter can effectively protect the motor and extend its service life by controlling the starting current.

1. Reduce grid fluctuations

When the motor starts, the current surge may cause voltage fluctuations in the power grid, affecting the operation of other equipment. The soft starter can reduce the fluctuations in the power grid and ensure the stable operation of the power grid by controlling the starting current.

1. Improve startup efficiency

By controlling the starting current of the motor, the soft starter can make the motor start more smoothly, reduce energy loss during the starting process, and improve starting efficiency.

1. Reduce mechanical shock

During the starting process of the motor, the current shock may cause the impact of mechanical parts, affecting the operation of the equipment. The soft starter can reduce the mechanical shock and ensure the stable operation of the equipment by controlling the starting current.

2. The principle of soft starter

1. Voltage control principle

The soft starter achieves soft starting by controlling the input voltage of the motor so that it gradually increases during the starting process. Specifically, when the motor starts, the soft starter gradually increases the input voltage from 0 to the rated voltage, so that the starting current of the motor gradually increases, avoiding current shock.

1. Current control principle

The soft starter achieves soft starting by controlling the input current of the motor so that it gradually increases during the starting process. Specifically, when the motor starts, the soft starter gradually increases the input current from 0 to the rated current, so that the starting current of the motor gradually increases, avoiding current shock.

1. Time control principle

The soft starter achieves soft starting by controlling the starting time of the motor so that it gradually increases during the starting process. Specifically, when the motor starts, the soft starter gradually increases the starting time so that the starting current of the motor gradually increases, thus avoiding current shock.

1. Phase control principle

The soft starter achieves soft starting by controlling the input phase of the motor so that it gradually increases during the starting process. Specifically, when the motor starts, the soft starter gradually increases the input phase from 0 to the rated phase, so that the starting current of the motor gradually increases, avoiding current shock.

3. Application of soft starter

1. Industrial field

In the industrial field, soft starters are widely used in the starting of various mechanical equipment, such as fans, pumps, compressors, etc. By using soft starters, the starting current impact can be effectively reduced, the motor and the power grid can be protected, and the service life of the equipment can be extended.

1. Construction

In the field of construction, soft starters are widely used to start equipment such as air conditioners, elevators, and water pumps. By using soft starters, the starting current impact can be effectively reduced, the stable operation of the equipment can be ensured, and the energy efficiency of the building can be improved.

1. Power industry

In the electric power field, soft starters are widely used in the starting of generators, transformers and other equipment. By using soft starters, the starting current impact can be effectively reduced, the power grid can be protected, and the stability of the power system can be improved.

1. Transportation

In the field of transportation, soft starters are widely used in the start-up of rail transportation equipment such as subways and light rails. By using soft starters, the starting current impact can be effectively reduced, the stable operation of rail transportation equipment can be ensured, and transportation efficiency can be improved.

1. Mining industry

In the mining industry, soft starters are widely used to start mine hoists, conveyor belts and other equipment. By using soft starters, the starting current impact can be effectively reduced, the motor and power grid can be protected, and the safety and efficiency of mining production can be improved.

4. Development trend of soft starter

1. Intelligent

With the development of science and technology, soft starters are gradually developing towards intelligence. By integrating advanced control algorithms and communication technologies, soft starters can achieve more precise control, improve starting efficiency and reduce energy consumption.

1. Integration

In order to simplify the structure of the electrical system and reduce costs, soft starters are gradually moving towards integration. By integrating soft starters with other electrical equipment, a more compact design can be achieved and the reliability of the system can be improved.

1. Greening

With the improvement of environmental awareness, soft starters are gradually moving towards greening. By adopting low-energy consumption and low-emission materials and technologies, soft starters can achieve more environmentally friendly operation and reduce the impact on the environment.

1. Customization

In order to meet the needs of different industries and equipment, soft starters are gradually developing in the direction of customization. By customizing the performance and functions of soft starters according to the specific needs of customers, we can better meet customer needs and improve product competitiveness.

V. Conclusion

As an important electrical equipment, soft starter has been widely used in industry, construction, electricity, transportation, mining and other fields. By controlling the starting current of the motor, the soft starter can effectively reduce the starting current impact, protect the motor and the power grid, and extend the service life of the equipment.