![]() Just like a traditional transformer, they have a primary winding and multiple secondary windings. Synchros and resolvers, World War II-era technology, still are widely used in modern-day electronic motion-control applications. But how do synchros and resolvers work, and what techniques must be used to ensure they produce accurate results? As the aircraft turns, the amount of coupling in the transducer changes proportionally. In an ADF, for example, the resolver or synchro is used to drive an indicator. The simplicity of their connection and today’s synchro-to-digital and digital-to-synchro converter boards make the synchro a very attractive component. Traditionally, they have been the transducer of choice where reliability is important and difficult environment conditions exist. Synchros have been used in a variety of military and commercial systems for many years. They can be used in a variety of applications, such as an inertial navigation reference unit (gyro or compass), an automatic direction finder (ADF), an omnirange system, distance measurement equipment, cockpit indicators, and landing-gear positioning and control. Types of transducers include synchros, resolvers, and linear/rotary variable differential transformers (LVDTs/RVDTs). ![]() Converting angular rotation to an electrical signal is the job of an AC transducer.
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