Buke servo motor - fault and treatment of three-phase asynchronous motor(1-5)

1. The motor cannot rotate after being energized, but there is no abnormal noise, no peculiar smell and smoke.

1. Cause of failure

(1) The power supply is not connected (at least two phases are not connected);

(2) Fuse blowing (at least two-phase blowing);

(3) The overcurrent relay is adjusted too small;

(4) The wiring of the control equipment is incorrect.

2. Troubleshooting

(1) Check whether there is a break point at the power circuit switch, fuse and junction box, and repair it;

(2) Check the fuse model, the cause of the fuse, and replace the fuse;

(3) Adjust the setting value of the relay to cooperate with the motor;

(4) Correct the wiring.

Second, the motor does not rotate after the power is on, and then the fuse is blown out

1. Cause of failure

(1) Lack of one-phase power supply, or the fixed trunk coil is connected to the opposite side;

(2) Phase-to-phase short circuit of stator winding;

(3) Grounding of stator winding;

(4) The stator winding is incorrectly wired;

(5) The cross-section of the fuse is too small;

2. Troubleshooting

(1) Check whether the knife switch has a phase that is not closed, but there is a phase disconnection in the power circuit; Eliminate reverse faults;

(2) Detect the short circuit point and repair it;

(3) Eliminate grounding;

(4) Detect and correct misconnections;

(5) Replace the fuse;

3. After powering on, the motor does not rotate and there is a buzzing sound

l. Cause of failure

(1) There is an open circuit in the stator and rotor windings (one-phase disconnection) or one-phase power loss of the power supply;

(2) The beginning and end of the winding lead wire are connected incorrectly or the winding is reversed;

(3) The contact of the power supply circuit is loose and the contact resistance is large;

(4) The motor is overloaded or the rotor is stuck;

(5) The power supply voltage is too low;

(6) The assembly of the small motor is too tight or the grease in the bearing is too hard;

(7) The bearing is jammed.

2. Troubleshooting

(1) Identify the breakpoints and repair them;

(2) Check the winding polarity; Judge whether the end of the winding is correct;

(3) Tighten the loose wiring screws, use a multimeter to judge whether the joints are falsely connected, and repair them;

(4) load shedding or detecting and eliminating mechanical faults,

(5) The inspection is also misconnected to the specified surface connection method as Y; Whether the voltage drop is too large due to the thin power supply wires, and corrects it,

(6) Reassemble to make it flexible; Replacement of qualified grease;

(7) Repair bearings.

Fourth, the motor is difficult to start, and when the rated load is loaded, the speed of the motor is much lower than the rated speed

1. Cause of failure

(1) The power supply voltage is too low;

(2) The surface connection method motor is mistakenly connected to Y;

(3) The cage rotor is welded or broken;

(4) The local coil of the stator and rotor is misconnected and reversed;

(5) Motor overload.

2. Troubleshooting

(1) Measure the power supply voltage and try to improve it;

(2) correction of connections;

(3) Check the open welding and broken points and repair them;

(4) Detect the misconnection and correct it;

(5) Restore the correct number of turns;

(6) Load shedding.

Fifth, the no-load current of the motor is unbalanced, and the three-phase difference is large

1. Cause of failure

(1) When rewinding, the number of turns of the stator three-phase winding is not equal;

(2) The end of the winding is wrongly connected;

(3) The power supply voltage is unbalanced;

(4) There are faults such as inter-turn short circuit and reverse coil connection in the winding.

2. Troubleshooting

(1) Rewind the setter winding;

(2) check and correct;

(3) Measure the power supply voltage and try to eliminate the imbalance;

(4) Eliminate winding faults.

Buke servo motor - fault and treatment of three-phase asynchronous motor(1-5)

Buke servo motor - fault and treatment of three-phase asynchronous motor(1-5)

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