There is no precise estimate or table that can be used to predict the lifetime of a servomotor. Under ideal conditions, the lifetime of a servomotor can be more than 25 years, or less than a year under extreme conditions.

Most OEMs (Original Equipment Manufacturers) attribute the life of a servomotor to the life of the bearings. Some manufacturers have therefore given an indicative lifetime for the bearings they incorporate in their servomotors. This is how they tried to predict the lifetime of the motor.

Indramat: 30.000 working hours
Allen Bradley: 20,000 working hours
Yaskawa: 20.000 working hours
Siemens: 20,000 working hours