The common motor burned, there are three: phase loss, overload, short-circuit.

    (1) missing: open the motor to see the burning part of the winding distribution of very regular, symmetrical distribution, burning two-phase star connection, delta connection burn phase. Such a situation is not a quality problem.

    (2) Overload: open motor observation, the entire winding line package color darker black ends of straps crack, serious and white and notch insulation due to overheating and melting take the white foam. The main reason is due to to serious motor overload ultra-current heat insulation damage caused by a short circuit burned. Such a situation does not belong to quality problems.

    (3) Short: Open motor observed line package was factory fresh color, but at some point cause electrical short-circuit due to bad insulation. Such a quality problem.

Note: open to motor winding of the motor observed two end caps are open, so observe them more clearly, it will be easier to judge when the motor burned.