The motor common fault analysis

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Three-phase asynchronous motors are widely used, but by the long-running, various fault occurs, determine the cause of the fault in a timely manner and dealt with accordingly, is to prevent the failure to exp and, to ensure the normal operation of the equipment is an important work.
Energized motor can not rotate, but no abnormal sound, no smell and smoke.
1. The cause of the malfunction
â'  Power did not pass (did not pass) at least two phases;
â'¡ fuse is blown (at least two blown);
â'¢ overcurrent relays tune too small;
â'£ control equipment wiring error.
2. Troubleshooting
(1) Check the power circuit switch, fuses, junction boxes at a breakpoint, and repair;
(2) Check the fuse model, fusing the reason, a new fuse;
â'¢ adjust with the relay settings and motor;
â'£ correct wiring.
Energized motor does not turn, then the fuse
1. The cause of the malfunction
â'  one phase power supply, or given Route circle opposite the pick;
â'¡ stator winding phase short circuit;
â'¢ stator winding ground;
(4) the stator winding connection error;
â'¤ fuse cross section is too small;
â'¥ power line sho rt-circuit or ground.
2. Troubleshooting
â'  Check the knife a phase not Gehao, power supply circuit has a phase wire; to eliminate reverse fault;
â'¡ detect short-circuit point, be repaired;
â'¢ eliminate the grounding point.
The â'£ mistakenly identified then, to be corrected;
â'¤ replacement fuse;
Energized, the motor does not turn hum
l. The cause of the malfunction
â'  stator and rotor windings open circuit (one phase disconnected) or power is a relative loss of power;
â'¡ winding Lead the whole story Termination wrong or winding internal reversed;
â'¢ loose power circuit contacts, contact resistance;
â'£ motor load is too large or rotor stuck;
(5) Power supply voltage is too low;
â'¥ small motor assembly is too tight or the bearings inside the grease is excellent;
â'¦ bearing stuck.
2. Troubleshooting
(1) identification of breakpoints to be repaired;
â'¡ Check the winding polarity , to determine whether the winding end;
â'¢ fastening screws loose wiring multimeter to determine the joints whether false then be repaired;
(4) load shedding or identify and eliminate mechanical failure;
â'¤ check is also prescribed surface connection method mistake then Y, whether the power wires too small pressure drop is too large to be corrected;
â'¥ reassembled to make it flexible and replace qualified fats;
Bearing â'¦ repair.
Fourth, motor starter difficulties, rated load, the motor speed is lower than the rated speed more
1. The cause of the malfunction
â'  supply voltage is too low;
â'¡ surface connection motor misconnection Y;
â'¢ cage rotor open welding or broken;
â'£ stator and rotor partial coils wrong then reversed;
â'¤ repair the motor windings to increase the number of turns too much;
The â'¥ motor overload.
2. Troubleshooting
(1) measuring the supply voltage, and try to improve;
(2) correct the connection;
â'¢ Check the the open welding and breakpoints and repair;
â'£ mistakenly identified then Department to be corrected;
(5) restore the correct number of turns;
â'¥ shedding.
Five motor no-load current unbalance, phase difference between the
1. The cause of the malfunction
â'  rewound stator phase winding turns are not equal;
â'¡ winding, both terminating wrong;
â'¢ supply voltage imbalance;
The â'£ winding inter-turn short circuit, coil reverse fault.
2. Troubleshooting
(1) re-winding the development of sub-windings;
â'¡ Check and correct;
(3) to measure the power supply voltage to try to eliminate the imbalance;ball bearing company
â'£ steep addition to winding fault.
Six, the motor no-load, overload, ammeter pointer instability swing
1. The cause of the malfunction
Open welding the â'  cage rot or bars or broken bars;
â'¡ Wound rotor failure (one phase open circuit) or brush and collector ring short-circuiting means poor contact.
2. Troubleshooting
â'  detect broken bars to be the repair or replacement of the rotor;
â'¡ Check around the rotor circuit and fix them.
7, the motor load current balance, but large value
1. The cause of the malfunction
â'  repair stator winding turns, reduce excessive;
â'¡ Power overtension;
The â'¢ Y then motor mistake access for Δ;
â'£ motor assembly, rotor hold against the stator core is not aligned, the effective length of the shortened;
â'¤ air gap is too large or uneven;
â'¥ overhaul demolish the old winding, improper use hot-split method, so that the core burning.bearings high speed
2. Troubleshooting
(1) rewound stator winding to restore the correct number of turns;
â'¡ try to restor e rated voltage;
(3) grafting Y;
â'£ re-assembly;
â'¤ Change new rotor or adjust the air gap;
â'¥ to overhaul core or recalculated winding, and appropriately increase the number of turns.