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A brushless printed circuit resolver for converting a shaft angular position to a voltage signal, defined by the envelope of a carrier, which indicates the mechanical angle. The brushless resolver includes a stationary member having two conducting foils formed thereon which are capactively coupled t

A brushless printed circuit resolver for converting a shaft angular position to a voltage signal, defined by the envelope of a carrier, which indicates the mechanical angle. The brushless resolver includes a stationary member having two conducting foils formed thereon which are capactively coupled to associated foils on a movable member. The capacitive coupling between these input foils remains constant as the movable member is moved. A pair of output foils are also disposed on a movable member and each is electrically connected to one of the movable input foils. A pair of shaped stationary output foils are mounted with a small separation from the movable output foils so that the capacitive coupling between the movable and stationary output foils varies as a determinable function. To get the desired output it is necessary that the movable output foils and the stationary output foils be relatively shaped so that capacitive coupling between the movable and the stationary output foils vary as the desired function. There can be two pairs of movable output foils, disposed in a quadrature relationship, which provides an output signal giving an unambiguous indication of shaft position. By having the rotor output foils properly configured, a resolver having any number of poles can be produced. The output signal defined by the envelope of the carrier can be a two phase, quadrature displaced signal such as sine and cosine indications, three phase 120.degree. displaced signals as for a synchro, or if desired other number of phases can alsobe provided. By proper formation of the foil pattern configuration, the output signal as a function of the rotary angle can be made to be a variety of shapes. Sinusoidal output envelopes will normally be provided for standard resolver-synchro circuits. Triangular output envelopes which have special advantages for some position applications can also be provided.

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