Presented are oleophilic surface treatments for electric machines, methods for making/using such electric machines, and vehicles employing traction motors having stator windings with oleophilic treatments on select surfaces. An electric machine includes an outer housing with a direct-cooling thermal management system fluidly connected to the housing to circulate thereto a coolant fluid. A stator assembly, which is attached to the housing, includes a stator core with one or more electromagnetic windings mounted to the stator core. A rotor assembly is movably mounted to the hosing adjacent the stator assembly. The rotor assembly includes a rotor core with one or more magnets mounted to the rotor core spaced, e.g., across an air gap, from the winding(s). Select components of the stator assembly have a target surface with an oleophilic surface treatment that enlarges the target surface's wetted area and increases a coolant mass of the coolant fluid contacting the target surface.

A varnish injection system includes a rotatable mount, an electric motor supported by the rotatable mount, the electric motor including a stator and a wire, and a varnish injector including a base and a nozzle extending from the base, the nozzle defining an axis extending vertically therethrough. The electric motor is rotatable by the rotatable mount to a nonzero angle relative to the axis extending vertically through the nozzle. The nozzle is arranged to deposit varnish into a gap defined between the stator and the wire when the rotatable mount rotates the electric motor to the nonzero angle.

A varnish injection system includes a rotatable mount, an electric motor supported by the rotatable mount, the electric motor including a stator and a wire, and a varnish injector including a base and a nozzle extending from the base, the nozzle defining an axis extending vertically therethrough. The electric motor is rotatable by the rotatable mount to a nonzero angle relative to the axis extending vertically through the nozzle. The nozzle is arranged to deposit varnish into a gap defined between the stator and the wire when the rotatable mount rotates the electric motor to the nonzero angle.

A varnish injection system includes a varnish injector including a base, a nozzle extending from the base, and a spacer disposed on the nozzle, and an electric motor including a stator, a wire, and an insulating layer between the stator and the wire. The nozzle is arranged to deposit varnish between the stator and the insulating layer. The nozzle and the stator define a gap therebetween when the spacer engages the stator.

A varnish injection system includes a varnish injector including a base, a nozzle extending from the base, and a spacer disposed on the nozzle, and an electric motor including a stator, a wire, and an insulating layer between the stator and the wire. The nozzle is arranged to deposit varnish between the stator and the insulating layer. The nozzle and the stator define a gap therebetween when the spacer engages the stator.

An electric motor includes a stator, an insulating layer, and a wire. The stator includes a first circular laminate and a second circular laminate. The first laminate includes a first finger having a distal end extending toward a center point of the first circular laminate. The second laminate includes a second finger having a distal end extending toward a center point of the second circular laminate. The first and second fingers define a wall. The distal ends of the first and second fingers define a space therebetween. The insulating layer extends along the wall and into the space. The insulating layer is spaced from the distal end of the second finger. The wire extends along the insulating layer below the distal ends of the first and second fingers.

An electric motor includes a stator, an insulating layer, and a wire. The stator includes a first circular laminate and a second circular laminate. The first laminate includes a first finger having a distal end extending toward a center point of the first circular laminate. The second laminate includes a second finger having a distal end extending toward a center point of the second circular laminate. The first and second fingers define a wall. The distal ends of the first and second fingers define a space therebetween. The insulating layer extends along the wall and into the space. The insulating layer is spaced from the distal end of the second finger. The wire extends along the insulating layer below the distal ends of the first and second fingers.

A varnish application system includes an electric motor, a clamp, and a varnish injector. The clamp includes a beam, a first end plate fixed to the beam and engageable to a first end of the electric motor, and a second end plate releasably connected the beam and engageable to a second end of the electric motor. The varnish injector is arranged to apply varnish to the electric motor when the clamp engages the electric motor.

A varnish application system includes an electric motor, a clamp, and a varnish injector. The clamp includes a beam, a first end plate fixed to the beam and engageable to a first end of the electric motor, and a second end plate releasably connected the beam and engageable to a second end of the electric motor. The varnish injector is arranged to apply varnish to the electric motor when the clamp engages the electric motor.

A stator for an electrical machine has a stator core (16) with stator grooves (19). Stator windings (17) are received in the stator grooves (19) of the stator core (16). Groove insulators (20) are received in the stator grooves (19) of the stator core (16) such that the groove insulators (20) are arranged between the stator core (16) and the stator windings (17). The groove insulators (20) are made of of plastic, namely a first plastic that provides the isolation function of the groove insulator (20) and a second plastic and/or a third plastic that provides a function of the respective groove insulator (20) differing from the isolating function.