Motor soft starter is a new type of starting equipment with international advanced level, which is designed and produced by using power electronic technology, microprocessor technology and modern control theory. This product can effectively limit the starting current of AC asynchronous motor when starting, and can be widely used in fans, water pumps, transportation, compressors and other loads. It is an ideal replacement of traditional star delta conversion, auto coupling voltage reduction, magnetic control voltage reduction and other voltage reduction equipment.
Soft starting of motor is to realize the smooth starting of motor and mechanical load by adopting technical means such as voltage reduction, compensation or frequency conversion, so as to reduce the influence of starting current on power grid and protect power grid and mechanical system.
First, make the output torque of the motor meet the requirements of the mechanical system for starting torque, ensure smooth acceleration and smooth transition, and avoid destructive torque impact;
Second, make the starting current meet the requirements of the motor's bearing capacity, and avoid the insulation damage or burning caused by the motor's starting heating;
The third is to make the starting current meet the requirements of relevant standards of power grid power quality, reduce the voltage sag and reduce the content of high-order harmonics.
Fourth, soft starter and frequency converter are two completely different products.
The frequency converter is used where speed regulation is required. The motor speed can be adjusted by changing the output frequency. The frequency converter is generally a long-term working system; The frequency converter has all soft starter functions.
The soft starter is used for motor starting. The starting process ends and the soft starter exits
The motor soft starter itself is not energy-saving. First, it is not an electrical equipment, but a simple functional product to realize the soft start of the motor; Second, it works for a short time and exits after starting.
However, the application of motor soft start technology can realize the energy saving of the drive system:
1. Reduce the requirements of motor starting on the power system. The selection of power transformer can ensure that it always operates in the economic operation area, reduce the operation loss of power transformer, and save energy.
2. The problem of motor starting shall be solved by the soft starting device to avoid the phenomenon of big horse pulling small car)