The performance of resolvers in extremes of durability and reliability acclaim thus are the most preferred for applications in harsh environments. So resolvers compared to encoders have a simple brushless and unencumbered with onboard electronics construction, and thus they endure high temperatures shaking, jarring vibration, dust, and moisture quite effectively.
Resolvers operate on analog signals and use magnetic coupling, instead of optical components or elaborate electronics. Thus, resolver-based harsh environment motors are much sturdier. They are less sensitive to contamination and interference since most often resolvers have a wide operational temperature range, that is, from -55 to +150, while still maintaining performance even under severe mechanical stress.
Encoders are particularly optical encoders more vulnerable to dust, debris and extremes of temperatures because of their very sensitive internal components, which require very accurate alignment and precise performance strictures for light transmission.
For critical applications where accuracy and survivability are paramount, such as aerospace, military, industrial automation, or oil and gas, resolver-based systems provide reliable solutions.