Patent ID: 8294313
Filing Date: 2012-10-23
Classification: H02K,Y02E,Y10T

Abstract:
1. A method for determining the axial position of a plurality of bearings for a rotor of an electric machine, wherein the rotor contains a first longitudinal section at the ambient air temperature during operation, and a second longitudinal section which is axially connected to the first section and is at least partially cooled to a cryogenic temperature during operation, with a coolant inlet pipe running along the central longitudinal axis of the rotor, going through the first longitudinal section and extending into the second section, wherein the inlet pipe is set at a distance from the rotor by a radial gap, in which the inlet pipe is mounted in the rotor in the first section by the bearings in different axial positions for rotation, comprising: choosing various batches of potential locations for the axial positions of the bearings; determining the deflection line of the inlet pipe upon action of radial force for the particular batch of potential locations; determining the minimum gap between the inlet pipe and rotor based on the determined deflection line; determining the axial positions according to one of the batches of potential locations which has a minimum gap greater than zero.