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What factors affect the service life of micro DC geared motors?

Update:28-03-2022
Summary:...
The service life of the miniature DC gear motor is not fixed, and it needs to be determined according to the performance and quality of the product. Generally, a good quality motor can have a service life of up to 20,000 hours, and a poorer motor may only have 500 hours. Of course, there are many factors that affect the final service life of the motor. for example:
1. Instant reversal of forward and reverse directions
2. Shock loading
3. Ultra-strength continuous work
4. Forcibly turn the output shaft
5. Use exceeding the allowable load of the protruding suspension and exceeding the allowable thrust load
6. Braking, reverse current, pwm braking and other pulse drive
7. The voltage used is not in line with the standard
8. The ambient temperature is too high, too low, too humid or some other abnormal environment
9. Use the geared motor for other purposes.