There are many reasons for short-circuit in the winding of three-phase asynchronous motor. Winding short-circuit can be divided into interturn short-circuit and interphase short-circuit, and interphase short-circuit includes short circuit in adjacent coils, short circuit between polar phase groups and short circuit between two phase windings. Interturn short circuit means that the two turns in series in the coil are short circuit due to the rupture of the insulation layer.

       Check whether the three-phase asynchronous motor winding short circuit method is as follows:

       1.External observation method. Observe whether the junction box and the end of the winding are burnt, and the winding is dark brown after overheating, and there is a smell

       2.Thermometry. No-load operation20Minutes (abnormal should be stopped immediately), with the back of the hand to feel whether the winding parts exceed the normal temperature

       3.Electric test method. If the current of a certain phase is too large, it indicates that the phase has a short circuit

       4.Bridge check. Measuring the DC resistance of each winding, generally the difference should not exceed5%If the above is exceeded, the phase with small resistance has a short circuit fault

       5.Short-circuit detector method. If there is a short circuit in the measured winding, the steel sheet will vibrate

       6.Multimeter or megohmmeter method. Measure the insulation resistance of any two-phase winding. If the reading is very small or zero, it indicates that there is a short circuit between the two-phase winding

       7.Voltage drop method. After the three windings are connected in series to the low-voltage safety AC, it is found that the group with a small reading has a short circuit fault

       8.The current method. When the motor is running without load, the three-phase current is measured first,When the two phases are measured and compared, if it does not change with the change of the power supply, the larger current of the first phase winding has a short circuit

       Three-phase asynchronous motor manufacturersRemind that when the winding short circuit is serious, the three-phase asynchronous motor cannot be started at all under load. The number of short circuit turns is small, although the motor can start, but the current is large and the three-phase is unbalanced, resulting in electromagnetic torque imbalance, causing the motor to vibrate and emit a "buzz" sound, and the short circuit turns flow a large current, making the winding rapidly heat, smoke and emit a scorch odor or even burn.

       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.