After we buy a new motor, when installed on the equipment, there will be a period of no-load operation, but what should be done if the three-phase asynchronous motor fails during no-load operation? Then the following is a simple understanding with Senli Motor Xiaobian, about the cause of no-load operation failure.

       breakdown1: The motor no-load current is unbalanced, the three-phase difference is large;

       breakdown2: motor no load, over load, ammeter pointer unstable, swing;

       breakdown3: Motor no-load current balance, but the value is relatively large.

       Cause failure1The reasons are analyzed as follows:

       1When rewinding, the number of turns of the stator three-phase winding is not equal;

       2The first and last ends of the winding are connected incorrectly;

       3Power supply voltage imbalance;

       4The winding has inter-turn short circuit, coil reverse connection and other faults.

       troubleshooting1The method is as follows:

       1Rewind the sub-winding;

       2Check and correct;

       3Measure the power supply voltage and try to eliminate the imbalance;

       4Eliminate winding faults.

       Cause failure2The reasons are analyzed as follows:

       1, cage rotor guide bar open welding or broken bar;

       2Wound rotor fault (a phase break) or brush, collector ring short circuit device contact is poor.

       troubleshooting2The method is as follows:

       1Find out the broken bar to repair or replace the rotor;

       2Check the loop around the rotor and repair it.

       Cause failure3The reasons are analyzed as follows:

       1 , The number of turns of the stator winding is reduced too much during repair.

       2The power supply voltage is too high;

       3Three-phase asynchronous motorYThe motor is mistakenly connected toΔ;

       4In the motor assembly, the rotor is inverted, so that the stator core is not aligned and the effective length is shortened;

       5The air gap is too large or uneven;

       6When overhauling and removing the old winding, the improper use of thermal dismantling method causes the core to burn.

       troubleshooting3The method is as follows:

       1Rewind the stator winding to restore the correct number of turns;

       2Try to restore the rated voltage;

       3, change toY;

       4, reassembly;

       5Replace the new rotor or adjust the air gap;

       6Overhaul the iron core or recalculate the winding to increase the number of turns appropriately.

       Mori machine,19Focus on the development and production of electric motors. Available if needed1688Search factory name "Shengzhou Chaoli Electric Appliance Factory" , Or online consultation message, we will have business personnel to get in touch with you, you can also contact us directly0575-8378-1127.