How is the servo motor bad?

Update:04 May 2018

Original 2018-03-05 The three princes wisdom maker Keep […]

Original 2018-03-05 The three princes wisdom maker
Keeping the servo motor running at its best is critical for any industrial enterprise, especially in industries such as robots or CNC machine tools. The cost of downtime due to servo motor failure can be very expensive, both economically and economically. Still in time.

Next, let's take a look at some of the most common servo motor failures and their potential causes to try to get around them.


Servo motors typically place a bearing on each of the drive side and the non-drive side to connect and support the motor shaft. The axial and/or radial loads in which the drive-side bearings are intended to support external mechanical connections generally have a large size and shaft load. Servo motor ball bearings are generally double-protected and permanently lubricated and do not require maintenance under normal conditions of use.

Fault phenomenon

Bearing failure is one of the most common motor failures. As the main wear part in servo motors, more than half of servo motor failures are usually attributed to bearing problems. The specific performance of the motor can be varied. If the motor rotates, it generates jitter, abnormal sound, etc., and the motor shaft is stuck.

It is worth noting that bearing failures, if not dealt with in a timely manner, often bring secondary damage. For example, crushed bearing debris flies into the brake or motor encoder, causing even more serious losses.

possible reason

Factors that affect the life of a motor bearing include: axial load acting on the bearing, radial load, motor speed, operating temperature, and bearing rating parameters. There are many causes of bearing failures, common ones include.

Although the practice of regular maintenance can avoid the risk of accidental downtime, it is not the most economical method. Because of the different operating conditions of different applications, the situation of bearing wear varies. By analyzing the actual use of the motor by a smart sensor (or diagnostic information provided by an intelligent encoder) attached to the motor, more targeted maintenance can be achieved.

When bearings have abnormal conditions or their service life expires, they should be replaced in time. Replace the bearing number should be the same as the original bearing. Demolition of the bearing should use the special drawing die for the bearing. The assembly of the bearing is recommended to use the cold pressing method (the heating method can easily cause the loss of the internal grease of the bearing).

Shaft seal

For motor applications (especially where motor shafts are connected to mechanical equipment) exposed to contaminated environments, servomotors often require oil seals. Shaft seals for motor shafts can block pollutants (oils, impurities) to extend motor life. Shaft seals are subject to wear and require regular inspection and replacement.