Ac servo motor may encounter many kinds of faults during operation，These faults can usually be caused by machinery、Electrical and environmental aspects of the analysis。The following are several common AC servo motor failure reasons：

one、Mechanical failure

1. Bearing wear：

• Excessive clearance after bearing wear leads to coaxial error between the center of the motor rotor and the center of the lead screw，Cause the mechanical system to jitter。

• Serious wear of bearing roller and cage will increase friction，Lead to“locked-rotor”，This in turn increases the response time of the servo system and produces vibration。

2. Motor rotor unbalance：

• The dynamic balance of the motor rotor has defects in manufacture or becomes worse after use，Will produce a shape“Vibrating machine”Same vibration source。

3. Shaft bending：

• Shaft bending is similar to rotor unbalance，In addition to creating a vibration source，It will also produce coaxial error between the center of the motor rotor and the center of the lead screw，Cause mechanical transmission system jitter。

4. Coupling problem：

• Coupling manufacturing defects or wear after use can cause coaxiality errors in the two parts of the coupling，In particular, cast rigid couplings，Due to poor manufacturing accuracy，Its more likely to vibrate。

5. Rail and lead screw problems：

• The difference in parallelism of the guide rail will cause the servo system to be unable to accurately reach or stay in the specified position，Make the motor vibrate continuously。

• The parallel error between the lead screw and the guide plane and the lead screw bending will also cause the motor to vibrate due to uneven load。

two、Electrical fault

1. The servo drive parameters are set improperly：

• Velocity proportional gain、Velocity integral constant、Position proportional gain、The acceleration feedback gain and other parameters are improperly set，The system gain may be too high or too low，Which in turn causes vibration。

2. Encoder fault：

• Encoder is the key part of servo motor to realize closed-loop control，If the encoder is damaged or malfunctioning，It will cause the servo motor to lose precision and positioning control。

3. Power problem：

• The servo motor power supply voltage instability or power failure will cause the servo system to work abnormally。

4. Signal line fault：

• The signal line between the servo motor controller and the encoder is abnormal or poorly connected，It will also affect the operation of the servo motor。

three、Environmental problem

1. Excessive temperature：

• High load operation for a long time or high ambient temperature will lead to high temperature of the servo motor，And then affect the motor performance，In serious cases, it will also damage the servo motor。

2. Bad environment：

• Servo motor mounted in wet、In dusty or corrosive gas environments，May cause damage to internal motor components or performance degradation。

four、Other faults

1. Starting equipment problem：

• Poor or damaged starting equipment may cause the servo motor to fail to start or operate properly。

2. Motor grounding、Poor zero connection：

• Motor grounding、Poor connection may result in electrical faults or safety hazards。

To sum up，There are many reasons for AC servo motor failure，Involving machinery、Electrical and environmental aspects。In practical application，You need to make a comprehensive analysis and judgment based on the fault symptom and onsite information，In order to quickly and accurately locate the fault cause and take appropriate measures。