How to identify when the optional electric hoist motor is good or bad

      People know  lift hoist  the "motor" is one of the most important accessories, like the heart of the human body, we can see the importance of the motor, then buy  wire rope hoist  how do we distinguish between good and bad motor, the following for you to make the following Introduction:
       The motor structure is very complex consists of nine parts, they are the electric hoist motor shield body, cutter drive, dual-chamber airlock segment erector, dump bodies, the latter supporting devices, electrical systems and auxiliary hoist equipment .
        Rope hoist  motors are generally a maximum diameter of 6.28m, length 65m, of which electric chain hoist motor shield body length 8.5m, supporting electric hoist equipment after a long 56.5m, total weight of about 406t, total Configurable Power 1577kW, maximum torque 5300kN m excavation maximum propulsion 36400kN, the narrowest driving speed of up 8cm/min.