Resolver

1. A resolver comprising:

a stator having:

a stator core having two sides in an axial direction;

a pair of insulators, each respectively disposed on one of the sides of the stator core;

a stator coil wound around the stator core; and

a recess that is axially extended and formed on an outer peripheral surface of the stator core;

a rotor arranged inside the stator;

a housing arranged outside the stator, an inner peripheral surface of the housing facing the recess and having a convexity that projects into the recess;

an engaging portion provided on an outer peripheral surface of the stator facing the convexity; and

a filler filled into the recess that fixes the stator core to the housing;

a step structure on the engaging portion, the step structure being formed between the stator core and the insulators,

wherein the insulators project in a radially outward direction at both sides of the stator core in the engaging portion and the insulators hold the filler.

2. The resolver according to claim 1 , wherein a receiving surface which supports the stator in the axial direction is provided on an inside of the housing, moving in the axial direction of the stator against the housing is controlled by the receiving surface, and moving in an opposite axial direction of the stator against the housing is controlled by the engaging portion.

3. The resolver according to claim 1 , wherein the engaging portion includes at least one of an inclined portion, a step portion, a concavity and a convexity, provided on an outside of the stator facing the recess.

4. The resolver according to claim 1 , wherein the housing is formed by aluminum die-casting.

5. The resolver according to claim 1 , wherein the housing is made of resin.

6. The resolver according to claim 1 , wherein the filler is an adhesive.