Patent ID: 9670792
Date: 2017-06-06
CPC Classifications: F01D,F02C,F04D,F05D

Claim:
1. A method of making turbomachine comprising the steps of: providing a stepped shaft having a large-diameter cylindrical portion, an intermediate-diameter cylindrical portion, and a small-diameter cylindrical portion all centered on a common axis; separately manufacturing and then permanently mounting a one-piece and annular first impeller wheel on the large-diameter portion with a back face of the first impeller wheel facing axially toward the intermediate-diameter portion and carrying a rotor bearing half of an axial magnetic bearing; detachably mounting a rotor ring of a radial bearing on the intermediate-diameter portion of the shaft; detachably mounting a one-piece and annular second impeller wheel on the small-diameter portion of the shaft with a back face of the second impeller wheel facing axially toward the first impeller wheel and carrying another rotor bearing half of another axial magnetic bearing, whereby the shaft, the first and second impeller wheels, and the rotor ring together form a rotor assembly; and mounting the rotor assembly in a support carrying respective stator bearing halves of the axial magnetic bearings and an outer stator ring of the radial bearing with the stator bearing halves each juxtaposed axially with a respective one of the rotor halves and the outer stator ring juxtaposed radially outside the inner rotor ring.