soft starter
This is the use of the phase shift voltage regulation principle of the thyristor to achieve the voltage regulation start of the motor, mainly used for the start control of the motor, the starting effect is good but the cost is high. Due to the use of thyristor components, the thyristor has a large harmonic interference during operation and has a certain impact on the power grid. In addition, fluctuations in the grid can also affect the conduction of the thyristor components, especially when there are multiple thyristors in the same grid. Therefore, the failure rate of the thyristor component is high, and since the power electronics technology is involved, the requirements for the maintenance technician are also high.
The soft starter connected in series between the power supply and the controlled motor is used to control the conduction angle of the internal thyristor, so that the input voltage of the motor gradually rises from zero with a preset function relationship until the end of the start, and the full voltage of the motor is given. Soft start, during the soft start process, the motor starting torque is gradually increased, and the rotational speed is gradually increased.
the inverter:
The frequency converter is the motor control device with the highest technical content, the most complete control function and the best control effect in the field of modern motor control. It adjusts the speed and torque of the motor by changing the frequency of the power grid. Because it involves power electronics technology and microcomputer technology, it is costly and has high requirements for maintenance technicians. Therefore, it is mainly used in areas where speed regulation is required and speed control is required.
