First, their roles are different:

1, inverter is a kind of electrical equipment that controls the rotation speed of the motor, and can control the motor speed and output power by adjusting the output frequency.

2、The soft starter is an electrical equipment that reduces the starting current and starting torque when starting the motor, which can avoid the shock and vibration when the motor and supporting equipment start, and extend the life of the equipment.

Second, the principle is different:

1, the inverter can control the motor speed and output power by adjusting the output frequency, generally using PWM technology.

2, the soft starter is by controlling the current rise slope and starting time to reduce the impact and vibration when starting, usually using capacitors, resistors, inductors and other circuits to achieve.

Three: Different scope of application:

1, the inverter is suitable for the need to adjust the motor speed of the field, such as machinery manufacturing, construction, pharmaceutical, food and other industries motor control.

2, soft starter is suitable for starting high-power motor, reduce the starting current and torque, reduce the impact and vibration when starting, protect equipment and reduce energy consumption in the field, such as metallurgy, petrochemical, water pump, air compressor, fan and so on. Soft starter has simple structure, easy maintenance, small size, convenient installation, and relatively more favorable price.