Patent ID: 8253284

Claim:
An electric motor comprising: a case: a stator of columnar shape including a stator core of annular shape and mold resin molding the stator core accommodated by the case, the stator core accommodating a rotor configured to rotate about a rotary shaft; and a position detecting circuit board including a position detecting element configured to detect a position of the rotor, wherein the stator has a cavity for accommodating the rotor, one end of the cavity is covered by the mold resin with an exposed portion exposed from an opening provided in the case, and the position detecting circuit board is provided on the exposed portion and located at an opposite side from the rotor across the mold resin covering the one end of the cavity, wherein the exposed portion has a circuit-board placement portion to place the position detecting circuit board, and an adjacent portion adjacent to the circuit-board placement portion, the thickness of the circuit-board placement portion is thinner than the thickness of the adjacent portion in a direction of the rotary shaft, and a space to place the position detecting element is formed between the position detecting circuit board and the circuit-board placement portion.