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With the development of social economy, more and more manufacturers use soft starters. In the application of soft starters, some users often have the following wrong concepts. The understanding of these errors is due to the lack of understanding and understanding of the principle of motor soft starter. We will analyze the problems in detail below:

1)、 It is considered that whether the motor can start successfully is related to the performance of soft starter. Under heavy load, the brand should be selected, even foreign brand.

1. The starting torque of the motor is the decisive factor of the starting motor load. The motor torque is related to many factors.

2. As a voltage regulator, the motor soft starter can only change the control amount of motor stator voltage. The motor torque is proportional to the square of stator voltage, which changes the stator voltage, which means changing the motor torque. The basic principle is fixed. Each brand soft starter is designed according to this principle, and it has nothing to do with the performance or quality of its products.

3. Whether it is a domestic brand or a foreign brand, in the starting torque problem, as long as the soft starter is not in fault, if the motor can not start the load, it is useless to replace other better brand products.

soft starter


2)、 When the motor can not start the load, it is considered that the capacity of soft starter is not enough, and the capacity of soft starter should be increased.


1. For motors, the large capacity of the motor reflects the output of larger driving torque. For soft starters, it is not possible to think that the capacity of soft starter only represents the maximum starting capacity it can bear, and the actual output of the torque is entirely dependent on the motor itself.


2. Soft starter is only a power supply, not a driving mechanism, and can not provide driving torque; Even if the capacity of soft starter is too large, the motor capacity is too small to start successfully.


3)、 It is considered that the smaller the starting current, the better the performance of soft starter with less voltage reduction in the power grid.


1. The starting current of motor depends on the load completely. The starting current of motor must be greater than the current determined by the driving torque required by the load to start successfully.


2. Under the condition of the power grid being constant, the voltage drop of the power grid is completely determined by the starting current of the motor.