In our useThree-phase asynchronous motorDirect starting of equipment is commonly used and simple starting method, but this way is too "rough", starting the motor directly connected to the grid through the knife or contactor, is really simple, but do you know that the faster the starting speed, the greater the harm. belowMori machineXiaobian will explain the harm of direct start of the motor for you:
I.Three-phase asynchronous motorDirect starting will cause excessive starting current, will cause grid voltage drop, affect the normal operation of other equipment, such a way to cause the impact of the power grid may also cause undervoltage protection action, resulting in harmful tripping equipment; Excessive starting current will make the motor winding heat, thus accelerating the aging of insulation and affecting the service life of the motor;
Second, excessive impact torque will cause the rotor cage bar, end ring fracture and stator end winding insulation wear, such a situation is easy to lead to breakdown, torque distortion, coupling, transmission gear damage and belt tear;
Third, the sudden change of pressure in the start-up process will cause excessive start-up loss, especially in the frequent start-stop, so we are inThree-phase asynchronous motorDirect starting has the following limitations:
1Whether the production machinery is allowed to drive the motor to start directly, which is a prerequisite;
2The capacity of the motor is not greater than the capacity of the power supply transformer10%~15%;
3Voltage drop during startup△UShould not be greater than the rated voltage15％. For medium and high-power motors, direct starting is generally not allowed, but a certain starting equipment is required to complete the normal starting work.
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