The secondary windings, which are fixed, are called stators. For this reason, the primary winding is called the rotor. The primary winding in a synchro or a resolver can be physically rotated with respect to the secondary windings. While a synchro and a resolver are electrically very similar to a transformer, they are mechanically more like a motor. In contrast, as shown in Figure 2, a resolver has two primary windings and two secondary windings oriented at 90º to each other. As shown in Figure 1, a synchro has one primary winding and three secondary windings, with each secondary winding mechanically oriented 120º apart. Synchros and resolvers are very similar however, there are some differences. And just like a transformer, their primary is driven by an AC signal. 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.
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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).
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This question is about R1 and R2 sharing. The last point mentioned in the article above (multiple receivers decrease accuracy) is not about R1 and R2 sharing but about S1-S2-S3 sharing and this does not apply when doing an "electronic" decode of position. Image from Moog synchro handbook page 2-2. This type of system has no-option other than to share the same excitation signal so, the precedent is already set:. One synchronous resolver was operated manually from some desk /back-office situation and it remotely turned (as an example) an antenna fastened to its interconnected resolver.
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Well, going back to some old-fashioned positional systems used on-board ships (for instance), that's exactly what they did and there was no option. To several resolvers (basically rotating transformers)? Is there any disadvantage with transmitting the same excitation signal