Three-phase asynchronous motor direct starting can be said to be the simplest way to start, only through the brake meter or contactor directly connected to the power grid. Today, Senli Motor Xiaobian will take you to understand the harm of direct starting of three-phase asynchronous motors, and I hope you can draw attention to it.
The advantage of direct starting is that the starting equipment is simple and the starting speed is fast, but the harm of direct starting is great:
(1Impact on the power system: the starting current is too large (no-load starting current can reach the rated current4～7The load starting current can reach the rated current8～10More than), causing the line voltage to drop, affecting other applications. The normal operation of the electrical equipment may also lead to undervoltage protection work and damage the equipment. At the same time, too high starting current will make the motor winding heat, accelerate insulation aging, reduce the life of the motor.
(2Mechanical impact: Excessive impact torque is often causedThree-phase asynchronous motorRotor cage strip wear, stator winding ring and insulation layer fracture, breakdown and burn damage, shaft deformation, clutch, transmission damage, belt tear. await
(3The impact on the production machinery: the sudden change in pressure during the start-up process often damages the pipeline and valve of the pump system and shortens the life.
It affects the transmission accuracy and even the normal process control. All of these pose a risk to the safe and reliable operation of the equipment, and also cause excessive energy loss when starting the three-phase asynchronous motor, especially during frequent start and stop processes.
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