The high quality discount motor, including 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 electronic technology, microcomputer technology, so the cost is high, the maintenance of technical personnel requirements are high, so it is mainly used in the need for speed regulation and the speed control requirements of the field.Also included is a full pressure direct starting:
Full pressure direct starting can be considered when both the capacity and load of the grid allow full pressure direct starting.The advantages are convenient operation and control, simple maintenance, and relatively economic.It is mainly used for starting small power motors. Considering from the point of view of energy saving, this method should not be used for motors greater than 11kW.For the normal operation of the squirrel cage asynchronous motor stator windings for the triangle connection method, if the stator windings are connected to the star at the start, after the start is completed and then connected to the triangle, it can reduce the starting current, reduce its impact on the grid.This starting mode is called star delta reduced pressure starting.
