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The secondary windings, which are fixed, are called stators. For this reason, the primary winding is called the rotor.
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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.
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Just like a traditional transformer, they have a primary winding and multiple secondary windings.
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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). Computer Conversions' Quality Control system conforms to MIL I45208, and source inspection is available on request.Converting angular rotation to an electrical signal is the job of an AC transducer. Naval, Aircraft, Missile and Nuclear programs. Static and Dynamic testing is performed on all units, and written or printed test data supplied at no extra cost.Computer Conversions has proven conformance to the Quality Assurance requirements of various U.S. Computer bus formats available ( COTS products ) are ISA, VME, PCI Bus, and PC104 built to commercial or military specifications.All units are supplied in either commercial, industrial, or military temperature ranges. Standard low cost units to satisfy almost any synchro/resolver or shaft interfacing requirement are available either off the shelf, or with very short lead times. Computer Conversions Corporation is a reputable, 40 year old, technically advanced electronics company engaged in the design and manufacturing of synchro converters, amplifiers, displays and encoders, brushless resolver packages, and related computer bus interface cards for the military and industrial market place.