Patent ID: 11955852
Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 14:
15. A method of assembling an electric machine, the method comprising:
providing an outer housing of the electric machine;
fluidly connecting a direct-cooling thermal management system to the outer housing to circulate thereto a coolant fluid;
attaching a stator assembly to the outer housing, the stator assembly including a stator core and an electromagnetic winding mounted to the stator core, the electromagnetic winding including a crown with a leg projecting from the crown and extending through a stator slot in the stator core such that exposed segments of the crown and the leg protrude from the stator slot;
applying an oleophilic surface treatment to a target surface of the electromagnetic winding, the oleophilic surface treatment configured to enlarge a wetted area of the target surface and increase a coolant mass of the coolant fluid contacting the target surface, the oleophilic surface treatment including a surface etching configured to exhibit an isotropic wetting behavior, the surface etching covering substantially all of the exposed segments of the crown and the leg, only the exposed segments of the crown and the leg including the surface etching; and
movably mounting a rotor assembly adjacent the stator assembly, the rotor assembly including a rotor core and a magnet mounted to the rotor core spaced from the winding.