Three-phaseinduction motor manufacturer applications
is extensive, but by the long-running, various problems in a timely
manner to determine the cause of the malfunction, and dealt with
accordingly, is to prevent the failure to expand an important task to
ensure the normal operation of equipment.
One, the motor power can not move, but no abnormal sound, no smell and smoke
A cause of the malfunction(1) Power did not pass (at least two-phase did not pass);(2) blown fuse (at least two-phase fuse);(3) The overcurrent relay tune too small;(4) control equipment wiring error.
Troubleshooting(1) Check
the power circuit breaker, fuses, junction boxes at a breakpoint,
repair; (2) check the fuse model, fuse reason, a new fuse; to(3) adjust the relay settings and the motor with the;(4) The correct connections .
Two, the motor power does not turn, and then fuse
1 Fault(1) one phase power supply, or the set of Route circle backward phase Connection;(2) The stator winding short circuit between phases; (3) stator winding ground;(4) stator winding connection errors; the(5) fuse cross section is too small;(5) power cord short circuit or ground.
2 Troubleshooting(1) check knife one phase is not Hao can be a phase wire power supply circuit; to eliminate the reverse fault; to(2) detect short-circuit point, be repaired;(3) eliminate the ground;(4) mistakenly identified then be corrected;(5) replace fuses; (3) eliminate ground location.
Power motor does not turn a hum
l.(4) Theelectrical induction motor of the cause of the malfunction 1, the rotor winding circuit (one phase wire) or a power loss of power; the(2) winding
Lead the whole story termination right or wrong Winding reversed; (3)
power circuit contacts loose contact resistance; load or stuck rotor;
the(5) supply voltage is too low;(6) The small motor assembly is too tight or the bearing grease excellent; the(7) bearing stuck.
Troubleshooting(1) to
pinpoint a break to be repaired; (2) Check the winding polarity;
determine whether the winding end of correct; (3) tighten the loose
terminal screws, use a multimeter to determine the connector is false
then, be repaired;(4) The load shedding or to detect and elimination of mechanical failure, the the(5) check
is also prescribed surface connection misconnection Y; because the
power wires too small so that the pressure drop is too large to be
corrected, (6) re-assembly to make it flexible; replacement of qualified
oils and fats;(7) repair bearings.
4, the motor is difficult to start, when the rated load, the motor speed below the rated speed more
Fault(1) supply voltage is too low;(2) surface connected motor is mistakenly connected to Y; the(3) cage type rotor welding or broken;(4) given rotor partial coils connected wrong, reversed;(3) repair the motor windings to increase the number of turns too much; The(5) motor overload.
Troubleshooting(1) measurements of supply voltages, trying to improve;(2) correct connection;(3) Check the open welding and breakpoints and repair;(4) The mistakenly identified then the Department, to be corrected;(5) The return to the correct number of turns;(6) load shedding.
5, the motor no-load current imbalance, phase difference between the large
(1) the cause of the malfunction(1) rewind, three-phase stator winding turns are not equal;(2) The winding head and tail termination is wrong; (3) power supply voltage unbalance; the(4) windings inter-turn short circuit, the coil reverse fault.
Troubleshooting(1) around to re-develop the sub-windings;(2) check and correct; (3) measurements of supply voltage, try to eliminate the imbalance;(4) The steep In addition to winding fault.
Motor no-load, over load, the ammeter pointer instability, swing
A cause of the malfunction(1) cage rotor BAR on solderability or broken bars;(2) The winding rotor failure (open circuit) or brush collector ring short circuit device, poor contact.
Troubleshooting(1) detect broken bars to be repaired or replaced rotor;(2) Check the rotation sub-loop and fix them.
7, theac induction motor load current balance, but the value
(1) repair of the cause of the malfunction 1, the stator winding turns to reduce excessive;(2) The supply voltage is too high; to(3) Y connected motor misconnection ?;(4) motor assembly, rotor mounted to the contrary, the stator core is not aligned, the effective length of less short;(5) The air gap is too large or uneven;(6) The overhaul of the removal of the old winding, improper use of hot-split method, the core burning.
Troubleshooting(1) rewind the stator windings, to restore the correct number of turns; (2) to try to restore the rated voltage; (3) divert to Y;(4) The re-assembly;(3) Replace with new rotor or adjust the air gap; the(5) overhaul core or recalculate the winding, the appropriate increase the number of turns
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