Shandong high voltage solid state soft starting cabinet manufacturer explains why the motor needs to be equipped with a starting cabinet

  Shandong high voltage solid state soft starting cabinet manufacturer explains the reasons why the motor needs to be equipped with a starting cabinet , Shandong high-voltage solid-state soft starting cabinet manufacturer says that the motor needs to be equipped with a starting cabinet, because if the motor adopts direct starting, the starting current is too large, which will affect the normal operation of the system, so it needs to be equipped with a starting cabinet
Which Shandong high-voltage solid-state soft starting cabinet is good, choose Xiangyang Yuanchuang electric, with high quality and low price The motor adopts direct starting, and the starting current is 7 times of the full load working current of the motor, which will cause excessive line voltage drop on the bus, resulting in rapid and short voltage fluctuation in the power supply and bus system connected to the motor, affecting the normal operation of other electrical equipment in the system
Harm of voltage drop to some equipment: integrated chip tester: when the voltage is lower than 85%, the tester stops working
PLC: when the voltage is lower than 81%, the PLC stops working
However, for some I / O equipment, when the voltage is lower than 90% and lasts for several cycles, the AC speed regulating transmission equipment will be cut off: when the voltage is lower than 90% and lasts for several cycles, The motor will be cut off: when the voltage is lower than 85% of the rated voltage, the motor will produce different degrees of overload
2 Reduce the impact on the motor body structure , When starting directly, the starting current is 7 times of the full load working current of the motor, which will generate 49 times greater electric power than the rated working condition on the stator coil and rotor squirrel cage bar of the motor, resulting in excessive stress on all parts of the motor, resulting in winding damage and squirrel cage bar fracture 7 times of starting current produces a large amount of Joule heat, causing winding overheating and accelerating motor insulation aging; 3
Reduce the impact on production transmission machinery , Direct starting produces excessive torque, which causes huge stress to the driven mechanical equipment, which will cause: , Rupture of pipes and valves , Bearing fracture and blade deformation of fan , Belt conveyor torn , Gear wear is accelerated and even broken , The impeller of the pump is deformed or damaged, the lubricating oil cannot be in place in time, and the bearing is dry ground , When directly starting to increase the shutdown table of the equipment, it will affect the normal progress of production, greatly increase the maintenance workload of staff, increase the maintenance cost and shorten the normal service life of mechanical equipment The starting torque T changes inductively with the magnitude of stator current
Therefore, the starting torque and current will be large