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How to Troubleshoot the Servo Motor?

AC servo motors are widely used, but after long-term operation, various failures will occur. It is an important work to prevent the expansion of the fault and ensure the normal operation of the equipment to judge the cause of the fault in time and carry out the troubleshooting of the servo motor.

Ⅰ. Motor encoder alarm

1. Cause of failure

① Wiring error;

②Electromagnetic interference;

③Encoder hardware damage caused by mechanical vibration;

④ Pollution caused by the on-site environment.

2. Servo motor troubleshooting

①Check the wiring and eliminate errors;

② Check whether the shielding is in place, check whether the wiring is reasonable and solve it, and add a filter to improve it if necessary;

③ Check the mechanical structure and make improvements;

④ Check whether the inside of the encoder is polluted or corroded (dust, oil, etc.), and strengthen the protection.

3. Installation and wiring standards

①Try to use the original cable;

② Separate the cables to keep them as far away as possible from polluted wiring, especially high-pollution wiring;

③ Always use the internal power supply whenever possible. If a switching power supply is used, a filter should be used to ensure that the power supply reaches a clean level;

④ Always ground the common terminal;

⑤ Keep the encoder housing insulated from the machine structure and connect to the cable shield;

⑥If it is not possible to insulate the encoder, connect the cable shield to the ground (or dedicated terminal) on the encoder housing and drive frame.

Ⅱ. Servo motor troubleshooting

1. Cause of failure

①The unreasonable mechanical design leads to excessive radial load force;

②The load end is stuck or severely overloaded;

③The hybrid servo motor and the reducer are not concentric when assembling.

2. Troubleshooting

①Check the maximum radial load force that the motor sample can bear, and improve the mechanical design;

②Check the operation of the load end, confirm the actual process requirements and make improvements;

③ Check whether the load is running stably and whether there is vibration, and improve the accuracy of mechanical assembly.

Ⅲ. Servo motor troubleshooting

1. Cause of failure

①The head and tail of the winding are connected wrongly;

②The power supply voltage is unbalanced;

③ There are faults such as inter-turn short circuit and coil reverse connection in the winding.

2. Servo motor troubleshooting

①Check and correct;

②Measure the power supply voltage and try to eliminate the imbalance;

③ Eliminate winding faults.

Ⅳ. When the motor is running, the sound is abnormal and there is abnormal sound

1. Cause of failure

①The bearing is worn or there are foreign objects such as sand particles in the oil;

②The rotor core is loose;

③The bearing is short of oil;

④ The power supply voltage is too high or unbalanced.

2. Servo motor troubleshooting

①Replace the bearing or clean the bearing;

②Repair the rotor core;

③ Come on;

④ Check and adjust the power supply voltage.

Ⅴ. The motor is difficult to start. When the rated load is used, the motor speed is much lower than the rated speed

1. Cause of failure

①The power supply voltage is too low;

②The face-connected motor is misconnected;

③The rotor is welded or broken;

④The rotor local coil is wrongly connected or reversely connected;

⑤ Too many turns are added when repairing the motor winding;

⑥The motor is overloaded.

2. Servo motor troubleshooting

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

② Correct the connection method;

③ Check the welding and breakpoints and repair them;

④Find out the wrong connection and correct it;

⑤Restore the correct number of turns;

⑥ load shedding.

Ⅵ. After the power is turned on, the motor cannot rotate, but there is no abnormal noise, no smell or smoke?

1. Cause of failure

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

②The fuse is blown (at least two phases are blown);

③ The overcurrent relay is adjusted too small;

④The wiring of the control equipment is wrong.

2. Servo motor troubleshooting

① Check the power circuit switch, fuse, and junction box for breakpoints, and repair them;

②Check the fuse type and the cause of the fuse, and replace the fuse with a new one;

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

④ Correct the wiring.

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