Patent ID: 7791335

Claim:
A resolver comprising: a stationary unit having a substantially annular shape centered about a center axis; and a rotary unit having a substantially annular shape centered about the center axis, the rotary unit arranged inside or outside of the stationary unit and supported so as to rotate around the center axis with respect to the stationary unit; wherein the stationary unit includes: teeth radially arranged around the center axis such that first ends of the teeth face the rotary unit; an insulator arranged to cover surfaces of the teeth; output coils including at least one of two output wires wound around each of the teeth via the insulator in a first number of turns; and excitation coils including at least one excitation wire wound around each of the output coils in a second number of turns less than the first number of turns such that the at least one excitation wire overlaps the at least one of two output wires.