| A worsening of manufacturability and a cost increase are restricted, and angle detection accuracy is improved, while preventing an increase in an axial direction dimension caused by redundancy. A redundant resolver is configured of a stator (3) and a rotor (4) that form a pair, wherein the rotor (4) is a rotor with a shaft angle multiplier of Nx having Nx (Nx is a natural number) salient poles, the stator (3) is such that n teeth T1 to Tn, where n is a natural number, are disposed sequentially in a circumferential direction, configuring M systems by being divided into M in the circumferential direction, and having an angle of 360/M degrees when angles of the teeth configuring one system are totaled, a one-phase excitation winding and a two-phase output winding are wound around each of the teeth T1 to Tn, excitation signals of the same frequency are applied by differing excitation circuits to the respective excitation windings, an output order per system is Nout (Nout is a natural number), and an abnormality is detected based on output signals of the M systems. |
