Patent ID: RE39748

Claim:
A sealed actuator comprising: a motor stator including a stator magnetic pole excited by a rotation-drive coil; housings to which said motor stator is attached; a motor rotor including a rotor magnetic pole disposed opposite to a surface of said stator magnetic pole through a gap; bearings for rotatably supporting a rotation shaft of said motor rotor to said housing; displacement measuring means for measuring displacement of said motor rotor; and a hermetically sealing partition wall made of a nonmagnetic metal material and disposed at the gap between said stator magnetic pole and said rotor magnetic pole, a space where said motor rotor is disposed being hermetically isolated from a space wherein said motor stator is disposed; wherein said bearings are a plurality of rolling bearings, said rolling bearings supporting said motor rotor at positions on said housings at both sides of a member constituting said sealing partition wall in a longitudinal direction of said motor rotor so that said housings directly receive a load applied to said bearings, wherein said displacement measuring means comprises a resolver rotor made of a mass of magnetic metal material, disposed at a side of said motor rotor, and includes a salient tooth cut from said mass of magnetic metal material; and a resolver stator including a detection coil magnetic pole and disposed at a side of said motor stator.