Frequency converters and soft starters are actually two completely different products. The inverter is mainly used in the place where the motor regulates the speed, and the inverter has the performance of soft starter and other starters, and at the same time, it also has great advantages over other starter devices in terms of starting characteristics. In the current field of start control, soft starters still have a great advantage, so what are the advantages of frequency converters in comparison?
(1) The starting torque is large and the power factor is high. Because the power factor of the motor is related to the working frequency, the power factor under the power frequency power supply is much lower than the power factor under the low-frequency power supply when the motor is running at low speed. The inverter can control the motor to start from low frequency, and always maintain a relatively high power factor and output torque close to the rated torque during the whole starting process under the condition of close to the rated current.
(2) Under the condition of light load or no load, or when measures such as load reduction and unloading are taken during start-up, the capacity of the inverter can be smaller than that of the motor. Of course, the drive needs to be taken out of operation after the start-up is complete.
(3) The starting current is small. The start-up time allowed by the drive-motor drag system can be very long. Because during this period, the motor current can not exceed the rated current of the motor, therefore, whether it is the inverter, the motor or other components, there is no abnormal heating. Due to the small starting current, the required power distribution capacity is also the smallest of all starting methods.
(4) The motor controlled by the inverter has good dynamic and static performance. Because the inverter itself is a device used for motor speed regulation, therefore, controlling the speed of the motor is its basic function, and the starting process can be arbitrarily controlled, and theoretically any starting speed curve can be set artificially at will, which is an advantage that other ways do not have.
(5) When dragging multiple motors with an inverter to start, even if the capacity of the dragged motor is quite different, it will not affect its starting performance. (6) After the start is completed, for the motor, a power supply switching process is required, and the power supply from the inverter is switched to the power supply of the power grid. During the whole process, there are problems such as frequency converter safety, current shocks. speed changes and other issues. In short, there is a switching problem, and the so-called soft switching is a safe and smooth switching.
There are still some disadvantages that cannot be overcome for a while, and only after overcoming these disadvantages can the inverter replace the soft starter.
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