US 12,445,028 B2
Tool and method for assembling rotary machine resolver and rotary machine with keyless resolver
Tobias Lindemark, Gothenburg (SE); and Hsingcheng Lin, Taiwan (CN)
Assigned to Volvo Car Corporation, Gothenburg (SE)
Filed by Volvo Car Corporation, Gothenburg (SE)
Filed on Dec. 19, 2022, as Appl. No. 18/083,706.
Claims priority of application No. 202123231760.8 (CN), filed on Dec. 21, 2021.
Prior Publication US 2023/0198361 A1, Jun. 22, 2023
Int. Cl. H02K 24/00 (2006.01); H02K 11/21 (2016.01); H02K 15/00 (2006.01)
CPC H02K 24/00 (2013.01) [H02K 11/21 (2016.01); H02K 15/00 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A tool for assembling a resolver of an electric machine, said electric machine comprising a casing, a machine rotor, a machine shaft, a machine stator comprising three-phase windings and a resolver that comprises a resolver rotor and a resolver stator, said tool comprising:
a DC voltage applying device configured to apply a DC voltage across at least one phase of windings of the three-phase windings to create a static magnetic field by a DC electric current flowing through the at least one phase of windings, the static magnetic field being able to force the machine rotor to rotate to an angular orientation where an N-S direction of magnets of the machine rotor is aligned with an N-S direction of the static magnetic field and to keep the machine rotor stably in the angular orientation; and
a pressing device configured to push the resolver rotor onto the machine shaft in an axial direction in a state that the machine rotor is kept in the angular orientation by the static magnetic field.