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Resolvers
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Resolvers are essentially a rotary transformer, having one rotor winding and two stator windings. The stator windings are located 90 degrees apart. Either rotor or stator winding can be used as primary. Typically, the rotor winding is driven by a reference voltage at a frequency ranging from 400 Hz to several KHz.
As the shaft rotates, the output voltages of the stator windings vary as the sine and cosine of the shaft angle. The two induced stator voltages are a measure of the shaft angle and are converted to a digital sig-nal in resolver-to-digital decoder. Among various R/D decoding methods available, the two most commonly used are:
- Ratiometric Tracking Converter and
- Phase Method Converter
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