Solid State Resolvers
The Phoenix development center on a solid state resolver to mimic the coil version resolvers described below. This would eliminate the need to sin excitation input and provide a solid state sine and cosine analog output for a controller to convert. This solution would allow for the elimination of contacts, brushes, bearing and seals.
Currently most resolvers would be similar to the description below:
A resolver is an absolute position feedback device which operates as described below.
The stator is made up of two windings: winding A and winding B. Winding A is positioned at a right angle to winding B. The rotor is made up of a third winding: winding C. This is energized with a sinusoidal voltage and allowed to rotate. The signal in winding C induces a signal in both windings A and B. Rotating winding C causes the magnitude of the induced signals to vary as a function of the angular position. The voltage induced in A is in quadrature to the voltage induced in B. Each position along the rotation produces a different value for the combination of A and B. This is illustrated in the following image:
Using the output of the two windings gives an absolute position, since each position has a different combination of A and B. The frequency also changes with the velocity, the velocity can also be determined.
The data output from the two phases is usually converted from analog to digital by means of a resolver-to-digital converter.
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