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Soft start is a concept relative to hard start. The most commonly used in engineering is three-phase asynchronous motors. In civil and industrial engineering electric equipment, due to their motor starting characteristics, these motors are directly connected to the power supply system (hard start), which will cause Large inrush current and peak torque are not conducive to the good operation of mechanical devices. Soft start is a smooth starting operation. The voltage slowly increases from zero to the rated voltage, so that there is no impact torque during the whole process of starting the motor.

Classified according to the load and speed changes of the motor, soft start is often used for:

Equipment with large load changes that do not allow speed changes: such as port belt conveyors, coal mine belt conveyors, cement belt conveyor equipment, escalators, lifts without frequency converters, steel rolling equipment, various industrial conveying machinery, etc.

Variable load equipment: such as central air conditioning host, hexagonal machine tool, mill, grinding machine, forming machine, punch machine, polishing machine, drape machine, press, cutting machine, compressor, oil well pumping unit, electric clothes truck, food mixer , Plastic open mixer/mixer, injection molding machine, forging machine, plate machine concrete forming machine, rubber forming machine, chemical industry equipment, agricultural equipment, textile machinery, papermaking equipment, industrial machinery, food and other heavy industrial machinery.

The introduction of equipment using soft start characteristics is as follows:

Air compressor - the large-capacity motor enters energy-saving operation when the load is light; when the input power supply voltage is unbalanced, it can automatically adjust the phase current to balance, reduce motor heating and extend life.

Centrifugal pump - Use the pump control function to reduce system surge caused by liquid flow impact during startup and stop, saving system maintenance costs.

Bridge crane - using double slope starting to achieve the most effective control of the acceleration process, improve productivity and reduce product damage.

Belt conveyors and automatic transmission lines - Utilize soft start and preset low-speed operation to achieve smooth starts and avoid product shifting and liquid spillage.

Ventilator - Use soft start to replace the old electromechanical starter to reduce belt wear and mechanical impact and save maintenance costs.

Crushing machinery - Use stall and stall protection to prevent mechanical failure or blockage from overheating and burning the motor.

Shredder - The use of soft start instead of auto-coupling step-down starting helps reduce the impact on the power grid and save energy.

Mixer - Utilizes dual-slope starting and preset speed-up operation to avoid mechanical failure, save energy, and does not require a frequency converter drive.