Check the connection bar for terminal u v and w for three phase motors connection type is either star y or delta ac motor winding continuity test using a multimeter check the continuity of motor winding from phase to phase u to v v to w w to u each phase to phase must have a continuity if winding is ok if any particular phase . The most common failure mode of a 3 phase ac motor is burnt winding or shorted winding leading to the damage of the motor often it is required to test the winding of the 3 phase windings with the aid of a multimeter or ohmmeter to determine whether the motor is still good or burnt or shorted. Measure resistance for each winding resistance between two different winding and resistance between winding and motors frame resistances of three winding should be same 5 resistance between two winding and winding frame should be more than 15 mohm you can detect burned motors winding by unique smell smells like burned lacquer. 6 9 or 12 wire 3 phase motor 6 wire motors you have 3 separate windings marked 1 4 2 5 and 3 6 each winding totally insulated from the others this motor can be wired in either delta or wye but only one voltage this is similar to 12 wire mo. The life of a three phase stator winding can be shortened dramatically when the motor is exposed to unfavorable operating conditions electrical mechanical or environmental the winding failures illustrated here are typical of what can happen is such circumstances
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