Patent ID: 7157820

Claim:
A resolver comprising: a stator comprising an annular stator body and a plurality of teeth which are formed on the stator, wherein the plurality of teeth protrude from a peripheral surface of the annular stator body; and a rotor which rotates so as to change a reluctance between the rotor and the peripheral surface of the annular stator body on which the plurality of teeth protrude, wherein the rotation of the rotor causes the stator to produce an electromagnetic induction action, wherein a magnetic flux blocking portion for blocking magnetic flux that penetrates toward the teeth from a peripheral surface side of the annular stator body on which the plurality of teeth do not protrude is formed on the annular stator body, the magnetic flux blocking portion being formed in a position in which, if a straight line were drawn from a center point of the annular stator body toward the outside in the radial direction and the straight line were rotated 360 degrees about the center point, the straight line would intersect with the magnetic flux blocking portion at every angle.