The main cause of short-circuit in the winding of three-phase asynchronous motor is long-term overload operation, which makes the insulation aging. When the motor is in use, if the current is too large, single-phase operation, it will cause short-circuit between winding turns, short-circuit between winding, short-circuit between winding electrodes and short-circuit between winding and other phenomena. Here is a simple understanding with Senli Motor Xiaobian.

       There are several reasons for this:

       1.The three-phase asynchronous motor runs under overload for a long time, which causes the insulation to lose its insulation effect

       2.Insulation damage caused by wiring; The winding moisture reduces the insulation resistance and results in insulation breakdown

       3.End and interlayer insulation materials are not properly padded or damaged during shaping

       4.The insulation of the end connection cable is damaged

       5.Insulation breakdown due to overvoltage or lightning strike

       6.Friction between rotor and stator winding ends causes insulation damage

       7.Metal foreign objects fall into the motor and oil is too much

       Three-phase asynchronous motor manufacturers remind that for long-term deactivation of the motor, if the insulation is affected by moisture and put into operation without insulation drying treatment, it is easy to cause the phenomenon of damp insulation breakdown, resulting in short circuit fault.

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