Patent ID: 8525383

Claim:
A slip ring device comprising: a slip ring shaft provided separately from a rotor shaft; a first slip ring and a second slip ring, both of which being put from both ends of said slip ring shaft, respectively, said first slip ring being attached by shrink-fitting to a first slip ring attaching portion of said slip ring shaft, and said second slip ring being attached by shrink-fitting to a second slip ring attaching portion of said slip ring shaft; a lead connecting portion which is located between the first slip ring attaching portion and the second slip ring attaching portion in said slip ring shaft and is formed to be a shaft diameter larger than the shaft diameters of the first slip ring attaching portion and the second slip ring attaching portion of said slip ring shaft; a first radial lead and a second radial lead, said first radial lead being placed in a first radial lead placing hole and said second radial lead being placed in a second radial lead placing hole, said radial lead placing holes being formed in the lead connecting portion; a first axial lead and a second axial lead, both of which being placed in a hollow hole formed in a central portion of said slip ring shaft, said first axial lead being connected to said first radial lead and said second axial lead being connected to said second radial lead; a first slip ring lead which is connected to said first slip ring and to said first radial lead; a second slip ring lead which is connected to said second slip ring and to said second radial lead; and a coupling which is attached by shrink-fitting to a shaft end portion on the rotor shaft side of said slip ring shaft after said first slip ring is attached by shrink-fitting.